WO2024146642A1 - Piezoelectric actuator, control valve, pilot valve, reversing valve and control system - Google Patents

Abstract

A piezoelectric actuator (100), comprising a casing (1), a driving part (2), a piezoelectric ceramic piece (3), a cable (4) and a swing rod (5). The driving part (2) is arranged in the casing (1), and the driving part (2) can move in the length direction of the casing (1). A chamber (11) is provided in the casing (1), and the piezoelectric ceramic piece (3) is arranged in the chamber (11). One end of the cable (4) passes through the casing (1) to connect to one end of the piezoelectric ceramic piece (3), and the other end of the piezoelectric ceramic piece (3) is connected to the driving part (2). One end of the swing rod (5) is pivotally connected to the casing (1), the other end of the swing rod (5) can swing, and the swing rod (5) abuts against the driving part (2). Further disclosed are a control valve, a pilot valve, a reversing valve and a reversing valve control system.

Description

Piezoelectric actuators, control valves, pilot valves, reversing valves and control systems

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority and rights to Chinese patent application with application number 2023100188236 and application date January 6, 2023; this application claims priority and rights to Chinese patent application with application number 2023100195526 and application date January 6, 2023; this application claims priority and rights to Chinese patent application with application number 2023100188255 and application date January 6, 2023; this application claims priority and rights to Chinese patent application with application number 2023200441954 and application date January 6, 2023; this application claims priority and rights to Chinese patent application with application number 2023200428610 and application date January 6, 2023, and the entire contents of the above-mentioned Chinese patent applications are hereby incorporated into this application by reference.

Technical Field

The present disclosure relates to the technical field of flow control equipment, and in some embodiments, to a piezoelectric actuator, a control valve, a pilot valve, a reversing valve, and a control system.

Background technique

Piezoelectric ceramics are information functional ceramic materials that can convert mechanical energy and electrical energy into each other, including positive piezoelectricity and inverse piezoelectricity. Positive piezoelectricity refers to the relative displacement of the positive and negative charge centers inside certain dielectrics under the action of external mechanical forces, causing polarization, which leads to the appearance of bound charges of opposite signs on the surfaces at both ends of the dielectric, thus forming a potential difference. On the contrary, inverse piezoelectricity refers to the displacement and mechanical force caused by applying a potential difference on the surfaces at both ends of certain dielectrics.

A piezoelectric actuator is a macro-retractable device based on piezoelectric ceramics. It has multiple layers of stacked sheet piezoelectric ceramics inside. The drive rod is displaced by the action of the multiple layers of piezoelectric ceramics. When the stroke of the drive rod needs to be increased, the number of stacked piezoelectric ceramics needs to be increased, which will not only increase the size and volume of the piezoelectric actuator, but also increase the energy consumption of the piezoelectric actuator.

Public Content

The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

To this end, embodiments of the present disclosure provide a piezoelectric actuator, a valve, and a control system.

The piezoelectric actuator of the disclosed embodiment includes a shell, a driving component, a piezoelectric ceramic sheet, a cable and a rocker arm. The driving component is disposed in the shell and is movable in the length direction of the shell. The shell has a chamber, and the piezoelectric ceramic sheet is disposed in the chamber. One end of the cable passes through the shell and is connected to one end of the piezoelectric ceramic sheet, and the other end of the piezoelectric ceramic sheet is connected to the driving component. One end of the rocker arm is pivotally connected to the shell, and the other end of the rocker arm can swing, and the rocker arm abuts against the driving component.

The disclosed embodiment also provides a control valve.

The valve of the disclosed embodiment includes a control valve body, a valve core, the piezoelectric actuator of the above embodiment and a transmission rod, the valve core is arranged in the control valve body, and the valve core is movable in the length direction of the control valve body, one end of the transmission rod is connected to the driving component, and the other end of the transmission rod is connected to the valve core, and the driving component can drive the valve core to move in the length direction of the control valve body

The disclosed embodiment also provides a pilot valve.

The valve of the disclosed embodiment includes a pilot valve body, a pilot valve core assembly and a piezoelectric actuator. The pilot valve core assembly is arranged in the pilot valve body. The pilot valve core assembly includes a valve seat and a pressure rod. The pressure rod is inserted into the valve seat and is movable in the length direction of the valve seat. The piezoelectric actuator includes a driving component, which is connected to an end of the pressure rod away from the valve seat, and the driving component can drive the pressure rod to move in the length direction of the valve seat.

The disclosed embodiment also provides a reversing valve.

The reversing valve of the disclosed embodiment of the pump comprises a pilot valve and a reversing assembly, wherein the pilot valve is connected to the reversing assembly, and the pilot valve is the pilot valve described in the above embodiment.

The disclosed embodiment also proposes a reversing valve control system.

The valve control system of the disclosed embodiment includes a control unit, a plurality of mutually independent reversing valves and a transformer, the control unit is respectively connected to the plurality of reversing valves, the plurality of reversing valves each include a reversing valve body and a relay, one end of the relay is connected to the control unit, the other end of the relay is connected to the reversing valve body, one end of the transformer is connected to a power supply, the other end of the transformer is respectively connected to the relays in the plurality of reversing valves, the reversing valve body includes a pilot valve assembly and a reversing assembly, the pilot valve assembly is connected to the reversing assembly, the pilot valve assembly includes a pilot valve body and a pilot valve core assembly, the pilot valve core assembly is arranged in the pilot valve body, the pilot valve core assembly includes a valve seat and a pressure rod, the pressure rod is inserted into the valve seat, and the pressure rod is movable in the length direction of the valve seat;

The piezoelectric actuator comprises a driving component, wherein the driving component is connected to an end of the pressure rod away from the valve seat, and the driving component can drive the pressure rod to move in the length direction of the valve seat.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a piezoelectric actuator according to an embodiment of the present disclosure.

FIG. 2 is a schematic structural diagram of a piezoelectric actuator according to another embodiment of the present disclosure.

FIG. 3 is a schematic structural diagram of a piezoelectric actuator according to another embodiment of the present disclosure.

FIG. 4 is a schematic structural diagram of a piezoelectric actuator according to another embodiment of the present disclosure.

FIG. 5 is a schematic structural diagram of a control valve according to an embodiment of the present disclosure.

FIG. 6 is a schematic structural diagram of the control valve shown in FIG. 5 from another perspective.

FIG. 7 is a schematic structural diagram of a control valve according to another embodiment of the present disclosure.

FIG. 8 is a schematic structural diagram of the control valve shown in FIG. 7 from another perspective.

FIG. 9 is a schematic structural diagram of a control valve according to another embodiment of the present disclosure.

FIG. 10 is a schematic structural diagram of the control valve shown in FIG. 9 from another perspective.

FIG. 11 is a schematic structural diagram of a pilot valve according to an embodiment of the present disclosure, and does not include a protective cover.

FIG. 12 is a schematic structural diagram of the pilot valve according to another embodiment of the present disclosure.

FIG. 13 is a schematic structural diagram of a pilot valve according to an embodiment of the present disclosure, and includes a protective cover.

FIG. 14 is a cross-sectional view of a pilot valve according to an embodiment of the present disclosure.

FIG. 15 is a cross-sectional view of a pilot valve according to another embodiment of the present disclosure.

FIG. 16 is a schematic structural diagram of a reversing valve according to an embodiment of the present disclosure.

FIG. 17 is a cross-sectional view of a reversing valve according to an embodiment of the present disclosure.

FIG. 18 is a schematic diagram of the structure of a reversing valve control system according to an embodiment of the present disclosure.

Reference numerals:
Control unit 1000, reversing valve 2000,
Piezoelectric actuator 100, pilot valve 200, pilot valve body 210, pilot valve core assembly 220, reversing valve assembly 300, reversing valve body 310, reversing valve core assembly 320, wiring terminal 400, connecting plate 500,
Shell 1, chamber 11, driving component 2, driving block 21, first part 2101, second part 2102, driving rod 22, piezoelectric ceramic plate 3, second through hole 31, cable 4, rocker arm 5, first through hole 51, adjusting assembly 6, connecting sleeve 61, adjusting rod 62, first elastic member 7, mounting seat 8, rotating shaft 9, valve core 10, connecting hole 101, transmission rod 11, first sealing ring 12, end cover 13, second elastic member 14, locking nut 15, second sealing ring 16, protective cover 17, spring seat 18, third elastic member 19, lever assembly 20, control valve body 211, accommodating space 2111, third through hole 2112, valve seat 212, pressure rod 23, relay 24, transformer 25, host computer 26, first controller 27, second controller 28, sleeve 29.

Detailed ways

Embodiments of the present disclosure are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, but should not be understood as limiting the present disclosure.

As shown in FIG. 1 and FIG. 4 , the piezoelectric actuator 100 according to the embodiment of the present disclosure includes a housing 1 , a driving component 2 , a piezoelectric ceramic sheet 3 , a cable 4 , a rocker rod 5 and an adjustment assembly 6 .

The driving component 2 is arranged in the housing 1, and the driving component 2 is movable in the length direction of the housing 1 (the left-right direction as shown in the figure). The housing 1 has a chamber 11, and the piezoelectric ceramic sheet 3 is arranged in the chamber 11. One end of the cable 4 passes through the housing 1 and is connected to one end of the piezoelectric ceramic sheet 3, and the other end of the piezoelectric ceramic sheet 3 is connected to the driving component 2. One end of the swing rod 5 is pivotally connected to the housing 1, and the other end of the swing rod 5 can swing, and the swing rod 5 abuts against the driving component 2. The adjustment component 6 is used to adjust the depth of the end of the swing rod 5 away from the housing 1 extending into the control valve body 211.

In some embodiments, the piezoelectric ceramic sheet 3 is disposed in the chamber 11, the right end of the driving component 2 is connected to the left end of the piezoelectric ceramic sheet 3, the left end of the driving component 2 is abutted against the middle of the right side of the swing rod 5, the upper end of the swing rod 5 is pivotally connected to the housing 1, and the swing rod 5 is pivotally connected to the housing 1. The lower end of the rod 5 can rotate around the pivot point, and the distance between the lower end of the rocker arm 5 and the housing 1 can be adjusted by adjusting the adjustment component 6, thereby adjusting the depth of the lower end of the rocker arm 5 extending into the valve core 10, thereby adjusting the initial installation position of the rocker arm 5.

In some embodiments, the piezoelectric actuator 100 also includes a mounting seat 8 and a rotating shaft 9, the right end of the mounting seat 8 is connected to the left end of the shell 1, the upper end of the rocker arm 5 is provided with a first through hole 51, and the lower end of the rotating shaft 9 passes through the mounting seat 8 and the first through hole 51 in sequence to fix the upper end of the rocker arm 5 on the mounting seat 8, thereby realizing the pivot connection between the rocker arm 5 and the mounting seat 8, that is, the rocker arm 5 can rotate around the rotating shaft.

In the embodiments of the present disclosure, a threaded connection can be adopted between the mounting base 8 and the shell 1. The present disclosure does not limit the specific connection method between the mounting base 8 and the shell 1. As long as a rigid connection between the mounting base 8 and the shell 1 can be achieved, it falls within the protection scope of the present disclosure.

It should be noted that, since the axial extension distance of the piezoelectric ceramic sheet 3 is in the micron level, the displacement adjustment of the piezoelectric actuator 100 is in the micron level, generally 0-500μm, and the movement distance of the valve core 10 is in the millimeter level, generally 0.1-50mm. When the piezoelectric actuator 100 is in use, if the initial installation position of the piezoelectric actuator 100 deviates, it will exceed the working range of the piezoelectric actuator 100, resulting in failure of the adjustment of the piezoelectric actuator 100, and the piezoelectric actuator 100 needs to be frequently disassembled to adjust the installation position of the piezoelectric actuator 100, that is, when the piezoelectric actuator 100 is in use, the installation position of the piezoelectric actuator 100 is very demanding.

The disclosed embodiment adjusts the distance that the rocker arm 5 extends into the control valve body 211 by providing an adjustment component 6, thereby reducing the precision requirement of the installation position of the piezoelectric actuator 100, achieving adjustment of the initial installation position of the piezoelectric actuator 100, and improving the installation efficiency of the piezoelectric actuator 100.

When the lower end of the cable 4 passes through the shell 1 to apply a potential difference to the two ends of the piezoelectric ceramic piece 3, the piezoelectric ceramic piece 3 extends axially, and the driving component 2 moves to the left under the action of the axial extension of the piezoelectric ceramic piece 3. The left end of the driving component 2 abuts against the middle part of the right side of the pendulum rod 5 to push the pendulum rod 5 to move to the left, and the leftward movement of the pendulum rod 5 will drive the pendulum rod 5 to rotate to the left around the rotation axis 9. The lower end of the pendulum rod 5 can produce a larger displacement under the action of the driving component 2 to the left, that is, the middle part of the pendulum rod 5 is pushed to rotate to the left by the driving component 2, so that the lower end of the pendulum rod 5 can produce a larger displacement, thereby increasing the stroke of the piezoelectric actuator 100.

It should be noted that the displacement that can be generated by a single piezoelectric ceramic sheet 3 is very small. In the related art, in order to increase the displacement generated by the piezoelectric actuator 100, it is necessary to stack dozens to hundreds of piezoelectric ceramic sheets 3 to increase the displacement of the piezoelectric actuator 100. However, the stacking of multiple piezoelectric ceramic sheets 3 will increase the size and volume of the piezoelectric actuator 100. The embodiment of the present disclosure uses a smaller number of stacked piezoelectric ceramic sheets 3 to drive the driving component 2 to move leftward, thereby causing the driving component 2 to drive the middle part of the rocker 5 to move leftward. From the principle of the lever, it can be seen that the displacement of the driving component 2 to the left under the axial extension force of the piezoelectric ceramic sheet 3 is less than the displacement of the lower part of the rocker 5 to the left, that is, a larger displacement is generated by stacking a smaller number of piezoelectric ceramic sheets 3, thereby increasing the stroke of the piezoelectric actuator 100. In addition, by using a smaller number of piezoelectric ceramic sheets 3, the size and volume of the piezoelectric actuator 100 can be reduced, thereby reducing the cost and consumption of the piezoelectric actuator 100.

In some embodiments, the driving component 2 includes a driving block 21 and a driving rod 22 that are detachably connected, and the adjusting component 6 The adjusting assembly 6 is arranged in the housing 1 and includes a connecting sleeve 61 , which is passed through the driving block 21 , and the driving rod 22 extends into the connecting sleeve 61 , and the depth of the driving rod 22 extending into the connecting sleeve 61 is adjustable.

In some embodiments, the connecting sleeve 61 is inserted into the driving block 21, and the right end of the driving rod 22 is inserted into the connecting sleeve 61 and is detachably connected to the driving block 21 to adjust the depth of the right end of the driving rod 22 inserted into the driving block 21, the right end of the driving block 21 is connected to the piezoelectric ceramic sheet 3, the left end of the driving rod 22 abuts against the middle of the right side of the rocker arm 5, the upper end of the rocker arm 5 is pivotally connected to the mounting seat 8, and the lower end of the rocker arm 5 can rotate around the pivot point. By adjusting the depth of the right end of the driving rod 22 inserted into the connecting sleeve 61 to adjust the length of the left end of the rocker arm 5 inserted into the control valve body 211, the initial installation position of the piezoelectric actuator 100 can be adjusted, thereby improving the installation efficiency of the piezoelectric actuator 100.

In some embodiments, the piezoelectric ceramic piece 3 is an annular structure, and a second through hole 31 is set at the central axis position of the piezoelectric ceramic piece 3. The connecting sleeve 61 is inserted into the driving block 21. The left end of the adjusting tool can be inserted into the second through hole 31 and inserted into the connecting sleeve 61 to adjust the distance that the right end of the driving rod 22 extends into the connecting sleeve 61, and then adjust the length of the lower end of the rocker arm 5 extending into the control valve body 211, thereby realizing the adjustment of the initial installation position of the piezoelectric actuator 100 and improving the installation efficiency of the piezoelectric actuator 100.

In the embodiment of the present disclosure, a second through hole 31 is provided on the piezoelectric actuator 100, and a connecting sleeve 61 is provided on the driving block 21. An adjusting tool is inserted into the connecting sleeve 61 through the second through hole 31 to adjust the depth of the right end of the driving rod 22 extending into the driving block 21, thereby adjusting the distance that the rocker arm 5 extends into the control valve body 211. After the initial installation position of the piezoelectric actuator 100 is adjusted, a potential difference is applied to both ends of the piezoelectric ceramic sheet 3, the piezoelectric ceramic sheet 3 extends axially, and the driving block 21 moves to the left under the axial extension of the piezoelectric ceramic sheet 3. The leftward movement of the driving block 21 drives the driving rod 22 to move to the left, thereby pushing the rocker arm 5 to move to the left.

In the embodiment of the present disclosure, a threaded connection is adopted between the driving rod 22 and the driving block 21, and accordingly the connection position between the driving rod 22 and the connecting sleeve 61 is set as an adjustment structure with internal and external threads. The threaded connection structure is more sophisticated, the adjustment accuracy is higher, and the adjustment is quick and convenient.

In the embodiment of the present disclosure, the second through hole 31 is a hexagonal hole, and the adjusting tool is a hexagonal screwdriver or a hexagonal wrench that cooperates with the hexagonal hole, that is, the left end of the hexagonal screwdriver passes through the second through hole 31 and is inserted into the connecting sleeve 61, and the hexagonal screwdriver is rotated to adjust the position of the driving rod 22 to achieve precise adjustment of the depth of the driving rod 22 extending into the connecting sleeve 61. It can be understood that the shape of the second through hole 31 and the adjusting tool can be set to other shapes, such as an inner square hole, a slot, a cross slot, an outer hexagonal boss, and an outer square boss. The embodiment of the present disclosure does not limit the shape of the second through hole 31 and the type of the adjusting tool. As long as it is a matching structure of the rotational torque to adjust the distance that the right end of the driving rod 22 extends into the connecting sleeve 61, it belongs to the protection scope of the present disclosure.

In some embodiments, the driving component 2 includes an integrally formed driving block 21 and a driving rod 22, the adjusting component 6 is disposed outside the shell 1, the adjusting component 6 is connected to the rocker arm 5, and the adjusting component 6 is connected to one end of the rocker arm 5 away from the shell 1, the adjusting component 6 includes an adjusting rod 62, the adjusting rod 62 is passed through the rocker arm 5, and the adjusting rod 62 is movable in the length direction of the shell 1, and one end of the adjusting rod 62 is suitable for extending into the control valve body 211.

In some embodiments, as shown in FIG. 3 and FIG. 4 , the adjustment component 6 is disposed outside the housing 1 , and the adjustment component 6 and the swing rod 5, the left end of the adjusting rod 62 extends into the control valve body 211, and the right end of the adjusting rod 62 extends into the lower end of the rocker arm 5. By adjusting the depth of the adjusting rod 62 extending into the rocker arm 5 to adjust the length of the adjusting rod 62 extending into the control valve body 211, the initial installation position of the piezoelectric actuator 100 is adjusted, thereby improving the installation efficiency of the piezoelectric actuator 100.

In some embodiments, the adjustment assembly 6 is disposed outside the housing 1 to facilitate adjustment of the angle between the rocker arm 5 and the driving rod 22, that is, to adjust the depth of the adjustment rod 62 extending into the rocker arm 5, and to facilitate replacement of the rocker arm 5 when the rocker arm 5 is worn.

In the embodiment of the present disclosure, when the adjusting rod 62 is connected to the swing rod 5 by threads, the depth of the adjusting rod 62 inserted into the swing rod 5 can be adjusted by simply clamping the adjusting rod 62 with a wrench and rotating it.

In some embodiments, the piezoelectric actuator 100 also includes a first elastic member 7, which is disposed in the chamber 11. The first elastic member 7 is sleeved on the driving component 2, and one end of the first elastic member 7 abuts against a side of the driving component 2 away from the piezoelectric ceramic sheet 3, and the other end of the first elastic member 7 abuts against the inner wall surface of the shell 1.

In some embodiments, the first elastic member 7 is disposed at the left end of the chamber 11, the first elastic member 7 is sleeved on the driving component 2, and the left end of the first elastic member 7 abuts against the inner wall surface of the mounting seat 8, and the right end of the first elastic member 7 abuts against the right end of the driving component 2. Through the setting of the first elastic member 7, the driving component 2 and the piezoelectric ceramic piece 3 are tightly connected to ensure that the axial extension displacement of the piezoelectric ceramic piece 3 can be effectively transmitted to the driving component 2, so that the driving component 2 drives the rocker arm 5 to rotate around the rotating axis 9, thereby reducing the energy consumption of the piezoelectric actuator 100.

In some embodiments, the distance between the end of the swing rod 5 away from the pivot point and the pivot point is D1, the distance between the contact point between the driving component 2 and the swing rod 5 and the pivot point of the swing rod 5 is D2, and D1:D2=1 to 10.

In some embodiments, by setting the rocker arm 5 and the rotating axis 9, the rocker arm 5 can be rotated around the rotating axis 9 under the action of the driving rod 22 to increase the stroke of the piezoelectric actuator 100, and by adjusting the distance between the abutment point between the driving rod 22 and the rocker arm 5 and the pivot point of the rocker arm 5, the displacement amplification factor of the rocker arm 5 can be adjusted.

In some embodiments, the ratio of D1:D2 is determined based on the difference between the thrust generated by the piezoelectric actuator 100 and the thrust actually required. That is, the ratio of D1:D2 is actually determined by the difference between the thrust of the driving rod 22 and the thrust generated by the lower end of the swing rod 5 combined with the actual thrust required by the lower end of the swing rod 5. When D1:D2 is less than 1, the displacement magnification of the swing rod 5 is too small, and when D1:D2 is greater than 10, the thrust generated by the lower end of the swing rod 5 is too small.

As shown in FIG. 5 and FIG. 6 , the control valve according to the embodiment of the present disclosure includes a control valve body 211 , a valve core 10 , a piezoelectric actuator 100 , and a transmission rod 11 .

The valve core 10 is disposed in the control valve body 211, and the valve core 10 is movable in the length direction (left-right direction as shown in the figure) of the control valve body 211. The piezoelectric actuator 100 is connected to the control valve body 211, and the piezoelectric actuator 100 includes a piezoelectric actuator 100 using any of the above-mentioned embodiments. One end of the transmission rod 11 abuts against the rocker rod 5, and the other end of the transmission rod 11 abuts against the valve core 10, or one end of the transmission rod 11 abuts against the adjustment rod 62, and the other end of the transmission rod 11 abuts against the valve core 10.

In some embodiments, the valve core 10 is disposed in the control valve body 211, and the piezoelectric actuator 100 is connected to the control valve body 211. When the adjustment component 6 is disposed in the housing 1, the right end of the transmission rod 11 abuts against the lower left end of the rocker 5, and the left end of the transmission rod 11 abuts against the valve core 10. When the adjustment component 6 is disposed outside the housing 1, the right end of the transmission rod 11 abuts against the left end of the adjustment rod 62. The left end of the transmission rod 11 abuts against the valve core 10 .

In some embodiments, the piezoelectric actuator 100 and the control valve body 211 can be connected by threaded connection or flange setting. The present disclosure does not limit the specific connection method between the piezoelectric actuator 100 and the control valve body 211. As long as a rigid connection between the piezoelectric actuator 100 and the control valve body 211 can be achieved, it falls within the protection scope of the present disclosure.

It should be noted that there is a certain gap between the various parts on the transmission path from the driving rod 22 of the piezoelectric actuator 100 to the valve core 10. When the total length of the gap exceeds the working range of the piezoelectric actuator 100, or the effective total length of the various parts on the transmission path is greater than the required length between the piezoelectric actuator 100 and the valve core 10, so that the valve core 10 cannot be sealed and connected with the control valve body 211 in the initial position, the initial installation position of the piezoelectric actuator 100 needs to be adjusted. In the related art, the piezoelectric actuator 10 needs to be adjusted. 0 is removed as a whole and the installation position is adjusted, resulting in frequent installation of the piezoelectric actuator 100 and difficulty in ensuring the accuracy of each adjustment of the installation position. In the embodiment of the present disclosure, an adjustment component 6 is provided on the piezoelectric actuator 100, and the distance that the rocker rod 5 extends into the control valve body 211 is adjusted by the adjustment component 6, so that the valve core 10 and the control valve body 211 are kept in a sealed connection, and at the same time, the gap is ensured to be located within the working range of the piezoelectric actuator 100, so that the displacement generated by the piezoelectric actuator 100 can effectively drive the valve core 10 to move.

When the adjustment component 6 is located in the housing 1, the second through hole 31 is provided on the piezoelectric ceramic sheet 3 of the piezoelectric actuator 100, and the connecting sleeve 61 is provided on the driving block 21. The adjustment tool is inserted into the second through hole 31 and inserted into the connecting sleeve 61 to adjust the depth of the driving rod 22 extending into the driving block 21, so as to adjust the distance of the left end of the adjustment rod 62 extending into the control valve body 211. When the adjustment component 6 is located outside the housing 1, the initial installation position of the piezoelectric actuator 100 is adjusted by adjusting the depth of the adjustment rod 62 extending into the swing rod 5 to adjust the length of the left end of the adjustment rod 62 extending into the control valve body 211.

It should be noted that the control valve is a two-position, two-way switch valve. In the initial position, the control valve is in a closed state, and the valve core 10 is in close contact with the control valve body 211 to form a sealing surface to separate the liquid port A and the liquid port B, that is, the working medium cannot flow between the A port and the B port. When the piezoelectric actuator 100 is installed and the installation position is adjusted, and a potential difference is applied to the piezoelectric actuator 100, the driving rod 22 of the piezoelectric actuator 100 drives the rocker arm 5 to move to the left, and the lower end of the rocker arm 5 pushes the transmission rod 11 to move to the left. The movement of the transmission rod 11 drives the valve core 10 to move to the left to connect the A port and the B port, and the working medium can communicate between the A port and the B port, that is, the control valve is opened.

The control valve of the embodiment of the present disclosure controls the movement of the valve core 10 through the piezoelectric actuator 100. Compared with the control methods such as electromagnets in related technologies, the piezoelectric actuator 100 has a faster response speed, a larger output force and a lower power consumption. The piezoelectric actuator 100 controls the displacement of the valve core 10 to improve the control accuracy of the control valve.

In some embodiments, the control valve also includes a second sealing ring 16, which is sleeved on the transmission rod 11. The second sealing ring 16 is located between the transmission rod 11 and the control valve body 211. The setting of the second sealing ring 16 forms a sealed connection between the transmission rod 11 and the control valve body 211, thereby improving the working efficiency of the control valve.

In some embodiments, the control valve body 211 includes the control valve body 211. In the embodiment of the present disclosure, the control valve body 211 and the control valve body 211 are integrally formed as one part. It can be understood that the control valve body 211 and the control valve body 211 can be set separately, that is, the control valve body 211 can be used as a separate part to seal and cooperate with the valve core 10 to separate the A port and the B port.

In the embodiment of the present disclosure, the transmission rod 11 is a cylindrical shaft. The transmission rod 11 can also be set to other shapes as long as it can be connected to the The configuration of receiving the thrust of the driving rod 22 and transmitting the thrust to the valve core 10 all falls within the protection scope of the present disclosure.

In some embodiments, the valve core 10 has a receiving groove, and the valve core 10 is provided with a connecting hole 101, one end of the connecting hole 101 is connected to the liquid inlet, and the other end of the connecting hole 101 is connected to the receiving groove. By providing the connecting hole 101, the pressure balance on the left and right sides of the valve core 10 can be maintained, so that the valve core 10 moves more smoothly.

In some embodiments, the control valve further includes an end cover 13 and a second elastic member 14 . The end cover 13 is connected to the control valve body 211 to seal the control valve body 211 . One end of the second elastic member 14 away from the valve core 10 abuts against the end cover 13 .

In some embodiments, the end cover 13 is connected to the control valve body 211 to seal the control valve body 211, the left end of the second elastic member 14 abuts against the right end of the end cover 13, and the right end of the second elastic member 14 abuts against the left inner wall of the valve core 10. Through the setting of the second elastic member 14, the valve core 10 is in close contact with the control valve body 211 to form a sealing surface to separate the A liquid port and the B liquid port, that is, when the second elastic member 14 is in an extended state, the control valve is in a closed state.

In the embodiments of the present disclosure, the second elastic member 14 is a spring. The second elastic member 14 may also be other devices that can put the control valve in a closed state. For example, compressed gas or elastic material may be provided between the valve core 10 and the end cover 13 to form a sealed connection between the valve core 10 and the control valve body 211.

In some embodiments, the control valve further includes a first sealing ring 12 , which is sleeved on the end cover 13 , and the first sealing ring 12 is located between the end cover 13 and the control valve body 211 .

In some embodiments, the first sealing ring 12 is provided to form a sealed connection between the end cover 13 and the control valve body 211 .

The first sealing ring 12 is sleeved on the end cover 13, and is suitable for sealing the gap between the control valve body 211 and the end cover 13, thereby avoiding fluid leakage in the accommodating space 2111 when the valve core 10 moves left and right, thereby improving the safety and stability of the control valve.

Furthermore, a second mounting groove is provided on the end cover 13, and one end of the first sealing ring 12 is suitable for being arranged in the second mounting groove to limit the first sealing ring 12, thereby improving the safety and stability of the control valve.

In some embodiments, there are multiple first sealing rings 12 and multiple second mounting grooves, and the multiple first sealing rings 12 correspond one-to-one to the multiple second mounting grooves, thereby improving the safety and stability of the control valve.

In some embodiments, the control valve further includes a sleeve 29 , the piezoelectric actuator 100 is inserted into the sleeve 29 , and one end of the sleeve 29 extends into the control valve body 211 .

It should be noted that the piezoelectric actuator 100 may also be connected to the control valve body 211 via a flange, or the piezoelectric actuator 100 and the control valve body 211 may be connected via a snap-fitting manner.

In some embodiments, the control valve further includes a locking nut 15 , which is sleeved on the sleeve 29 .

In some embodiments, the sleeve 29 is disposed at the right end of the control valve, and the left end portion of the sleeve 29 extends into the control valve body 211 to fix the position of the sleeve 29. The piezoelectric actuator 100 is connected to the control valve body 211 by sleeve-mounting the locking nut 15 on the sleeve 29.

In some embodiments, the valve core 10 and the control valve body 211 are sealed with an end face, a cone or a ball.

When installing the piezoelectric actuator 100 of the control valve, the piezoelectric actuator 100 and the control valve body 211 are rigidly connected. The depth of the lower end of the rocker arm 5 extending into the control valve body 211 is adjusted by adjusting the adjustment component 6, so as to achieve the effect of adjusting the initial installation position of the piezoelectric actuator 100, so that the valve core 10 and the control valve body 211 maintain a sealed connection while ensuring that the gap is within the working range of the piezoelectric actuator 100, thereby improving the installation efficiency of the control valve.

When the control valve is in the initial position, that is, the control valve is in the closed state, under the joint action of the second elastic member 14 and the corresponding hydraulic pressure, the valve core 10 is in close contact with the control valve body 211 to form a sealing surface to separate the A liquid port and the B liquid port.

When a potential difference is applied to the piezoelectric actuator 100, the driving block 21 moves to the left under the axial extension of the piezoelectric ceramic sheet 3, and the left end of the driving rod 22 abuts against the middle part of the right side of the rocker arm 5 to push the rocker arm 5 to move to the left. The leftward movement of the rocker arm 5 will drive the rocker arm 5 to rotate to the left around the rotation axis 9. The lower end of the rocker arm 5 can produce a larger displacement under the leftward action of the driving rod 22, thereby pushing the transmission rod 11 and the valve core 10 to move to the left, so that the valve core 10 and the control valve body 211 are separated, and the working medium can communicate between port A and port B to open the hydraulic valve.

When the potential difference of the piezoelectric actuator 100 is removed, the driving rod 22 of the piezoelectric actuator 100 generates a retracted displacement and a pulling force, and the valve core 10 is pushed to the right under the joint action of the second elastic member 14 and the corresponding hydraulic pressure, so that the valve core 10 and the control valve body 211 are re-fitted to form a seal, and the transmission rod 11 is pushed to the right to return to the initial position. The working medium cannot communicate between port A and port B, and the hydraulic valve is closed.

In some embodiments, the expansion and contraction amount of the piezoelectric actuator 100 is in a certain proportional relationship with the control voltage, and the displacement amount of the valve core 10 can be precisely controlled by controlling the size of the potential difference, thereby controlling the flow and pressure through the valve port.

As shown in the figures and the accompanying drawings, the control valve of the embodiment of the present disclosure includes a control valve body 211 , a valve core 10 , a piezoelectric actuator 100 , a transmission rod 11 , a second elastic member 14 and an end cover 13 .

The valve core 10 is arranged in the control valve body 211, and the valve core 10 is movable in the length direction of the control valve body 211. The piezoelectric actuator 100 includes a driving rod 22, which is connected to the valve core 10, and the driving rod 22 can drive the valve core 10 to move in the length direction of the control valve body 211. One end of the transmission rod 11 is connected to the driving rod 22, and the other end of the transmission rod 11 abuts against the valve core 10. The end cover 13 is connected to the control valve body 211, and one end of the first elastic member 7 abuts against the side of the valve core 10 away from the transmission rod 11, and the end of the first elastic member 7 away from the valve core 10 abuts against the end cover 13.

It should be noted that the thrust generated by the driving rod 22 is F, the resistance of the valve core 10 is F, and F>F. Then, when the control valve needs to be opened, the piezoelectric actuator 100 is energized to move the driving rod 22 to the left. At this time, the thrust generated by the driving rod 22 is F, and the driving rod 22 drives the transmission rod 11 to move to the left, thereby driving the valve core 10 to move to the left. It can be understood that when the piezoelectric actuator 100 is powered off, the piezoelectric ceramic sheet 3 is driven to drive the driving rod 22 to move to the right. At this time, the second elastic member 14 is stretched, and the valve core 10 moves to the right to close the through hole.

In some embodiments, the control valve body 211 has a receiving space 2111 and a through hole, the valve core 10 is arranged in the receiving space 2111, the control valve body 211 extends in the left-right direction, and the valve core 10 extends in the left-right direction, the valve core 10 moves in the left-right direction in the receiving space 2111, the drive rod 22 extends in the left-right direction, the transmission rod 11 extends in the left-right direction, the left end of the transmission rod 11 abuts against the right end of the valve core 10, and the left end of the drive rod 22 is connected to the right end of the transmission rod 11. In the embodiment of the present disclosure, the left end of the drive rod 22 is provided with an external thread, and the right end of the transmission rod 11 is provided with an internal thread, and the left end of the drive rod 22 is connected to the right end of the transmission rod 11. The ends are connected by threads. Further, the lengths of the transmission rod 11 and the driving rod 22 in the left-right direction can be adjusted by rotating the driving rod 22.

The second elastic member 14 extends left and right, the left end of the second elastic member 14 abuts against the control valve body 211, and the right end of the second elastic member 14 abuts against the valve core 10. The piezoelectric actuator 100 can be energized to drive the driving rod 22 to move in the left and right directions, thereby driving the valve core 10 to move in the left and right directions. Further, the second elastic member 14 can be a C-shaped spring or a hydraulic rod 23, or the first elastic member 7 can be other existing elastic materials, such as rubber in the embodiments of the present disclosure.

The control valve also has an A port and a B port, and the accommodating space 2111 has a first cavity and a second cavity, the A port is connected to the first cavity, the B port is connected to the second cavity, and the first cavity and the second cavity are connected through a through hole. When the control valve is in an open state, the piezoelectric actuator 100 is powered on to move the valve core 10 to the left to open the through hole, so that the A port is connected to the B port. When the control valve is in a closed state, the piezoelectric actuator 100 is powered off to move the valve core 10 to the right to close the through hole.

In some embodiments, as shown in the figure, the end cover 13 is connected to the control valve body 211 to seal the control valve body 211. In the embodiments of the present disclosure, the end cover 13 is connected to the control valve body 211 by threads, and when the second elastic member 14 needs to be replaced, the end cover 13 is disassembled and the second elastic member 14 is replaced. The right end of the end cover 13 abuts against the second elastic member 14. Furthermore, a first groove is provided on the valve cover, and the left end of the second elastic member 14 is suitable for being arranged in the first groove, and when the second elastic member 14 is stretched or compressed, the first groove is suitable for limiting the first elastic member 7.

The end cover 13 is connected to the control valve body 211 to seal the control valve body 211. The end cover 13 is provided with a first groove to limit the second elastic member 14, thereby improving the stability and safety of the control valve. The control valve of the embodiment of the present disclosure connects the left end of the driving rod 22 to the right end of the transmission rod 11 through threads, which is different from the thrust piston in the related art that cannot accurately adjust the displacement of the sealing pin.

The control valve of the embodiment of the present disclosure can adjust the length of the transmission rod 11 and the driving rod 22 in the left-right direction by rotating the driving rod 22, so that after the second elastic member 14 is plastically deformed, the length of the transmission rod 11 and the driving rod 22 in the left-right direction can be adjusted by rotating the driving rod 22, thereby improving the accuracy of the control valve in controlling the flow and preventing the flow from deviating from the preset value when the control valve is normally opened or closed.

In some embodiments, the driving rod 22 includes a first part 2101 and a second part 2102, the left end of the first part 2101 is connected to the right end of the transmission rod 11, the right end of the first part 2101 is connected to the left end of the second part 2102, the right end of the second part 2102 is connected to the piezoelectric ceramic piece 3, the radial dimension of the first part 2101 is smaller than the radial dimension of the second part 2102, the first elastic member 7 is sleeved on the first part 2101, the left end of the first elastic member 7 is abutted against the shell 1, and the right end of the first elastic member 7 is abutted against the left end face of the second part 2102.

In the embodiment of the present disclosure, the cable 4 is energized to drive the piezoelectric ceramic piece 3 to move to the left, and then the driving rod 22 drives the transmission rod 11 to move to the left, the first elastic member 7 is compressed, and then the valve core 10 moves to the left to open the through hole, and the second elastic member 14 is compressed, so that the A port is connected with the B port, or the cable is powered off, the second elastic member 14 stretches and the first elastic member 7 stretches, the valve core 10 moves to the right to close the through hole, and then the control valve is closed, and the transmission rod 11 and the driving rod 22 move to the right to restore the piezoelectric ceramic piece 3 to the position before the power is turned on. By setting the first elastic member 7 to ensure that the piezoelectric ceramic piece 3 is restored to the position before the power is turned off, the stability and safety of the control valve are improved.

In some embodiments, the control valve further includes a second sealing ring 16 , which is sleeved on the transmission rod 11 , and the first sealing ring 12 is located between the transmission rod 11 and the control valve body 211 .

In some embodiments, as shown in the figure, the second sealing ring 16 is sleeved on the transmission rod 11, and the second sealing ring 16 is suitable for sealing the gap between the transmission rod 11 and the control valve body 211. When the transmission rod 11 moves left and right, the second sealing ring 16 closes the gap between the transmission rod 11 and the control valve body 211 to prevent the fluid in the accommodating space 2111 from flowing to the piezoelectric actuator 100 through the gap between the transmission rod 11 and the control valve body 211, thereby improving the stability and safety of the control valve.

Furthermore, a first mounting groove is provided on the control valve body 211, and one end of the second sealing ring 16 is suitable for being arranged in the first mounting groove to limit the second sealing ring 16, thereby preventing the second sealing ring 16 from being driven by the transmission rod 11 to move left and right and causing relative displacement with the control valve body 211, thereby improving the safety and stability of the control valve.

In some embodiments, there are multiple first sealing rings 12 and multiple first installation grooves, and the multiple first sealing rings 12 correspond one-to-one to the multiple first installation grooves, thereby improving the safety and stability of the control valve.

In some embodiments, the connection distance between the driving rod 22 and the transmission rod 11 is adjustable.

In some embodiments, as shown in the figure, the left end of the driving rod 22 is connected to the right end of the transmission rod 11, the left end of the driving rod 22 is provided with an external thread, and the right end of the transmission rod 11 is provided with an internal thread. The left end of the driving rod 22 is connected to the right end of the transmission rod 11 through a thread. Furthermore, the length of the transmission rod 11 and the driving rod 22 in the left and right directions can be adjusted by rotating the driving rod 22, so that the control accuracy of the control valve can be adjusted in time, thereby improving the stability and safety of the control valve.

As shown in Figure 1 to Figure 2, the pilot valve 200 of the embodiment of the present disclosure includes a pilot valve body 210, a pilot valve core assembly 220 and a piezoelectric actuator 100. The pilot valve core assembly 220 is disposed in the pilot valve body 210. The pilot valve core assembly 220 includes a valve seat 212 and a pressure rod 23. The pressure rod 23 is penetrated in the valve seat 212, and the pressure rod 23 is movable in the length direction of the valve seat 212. The piezoelectric actuator 100 includes a driving component 2, which is connected to one end of the pressure rod 23 away from the valve seat 212, and the driving component 2 can drive the pressure rod 23 to move in the length direction of the valve seat 212.

In some embodiments, the right end of the pilot valve body 210 is connected to the left end of the piezoelectric actuator 100, the pressure rod 23 is inserted into the valve seat 212, the left end of the driving component 2 is connected to the right end of the pressure rod 23, and the left and right movement of the driving component 2 drives the pressure rod 23 to move in the left and right direction. The pilot valve core assembly 220 includes a valve seat 212 and a pressure rod 23, the pressure rod 23 is inserted into the valve seat 212, and the pressure rod 23 is movable in the length direction of the valve seat 212 (the left and right direction as shown in the figure). The piezoelectric actuator 100 includes a driving component 2, the driving component 2 is connected to one end of the pressure rod 23 away from the valve seat 212, and the driving component 2 can drive the pressure rod 23 to move in the length direction of the valve seat 212.

When a potential difference is applied to the piezoelectric actuator 100, the driving component 2 is displaced under the action of the potential difference to generate thrust. The connection between the driving component 2 and the pressure rod 23 drives the left and right movement of the pressure rod 23 to push the valve core 10 of the pilot valve 200 to move, thereby pushing the movement of the reversing component. Moreover, the expansion and contraction amount of the driving component 2 of the piezoelectric actuator 100 is in a certain proportional relationship with the control voltage. The displacement of the valve core 10 can be accurately controlled by controlling the size of the potential difference, thereby adjusting the flow and pressure of the valve port of the pilot valve 200, thereby improving the flow control accuracy of the pilot valve 200.

Since the thrust generated by the movement of the electromagnet driving the valve core 10 is 5-40N, and the thrust required for the pilot valve core assembly 220 to open during operation is generally 40-80N, a lever assembly 20 is provided between the electromagnet and the pilot valve core 200 in the related art. The thrust can be amplified by the piezoelectric actuator 100 of the embodiment of the present disclosure, which can generate a thrust of 50-100000N, which is much larger than the thrust required for the action of the pilot valve core assembly 220. The driving component 2 of the embodiment of the present disclosure is directly connected to the pressure rod 23, which reduces the overall size of the pilot valve 200 while also reducing the manufacturing cost of the pilot valve 200, thereby reducing the overall size and manufacturing cost of the pilot valve 200.

The pilot valve 200 of the embodiment of the present disclosure controls the movement of the pressure rod 23 in the pilot valve core assembly 220 through the piezoelectric actuator 100. The pilot valve 200 is connected to the reversing assembly to drive the movement of the reversing assembly. Moreover, compared with the control methods such as electromagnets in related technologies, the piezoelectric actuator 100 has a faster response speed, greater output force and lower power consumption. The piezoelectric actuator 100 controls the displacement of the pressure rod 23 to improve the control accuracy of the pilot valve 200, thereby improving the flow control accuracy of the pilot valve 200.

It should be noted that the main liquid inlet on the valve body of the reversing assembly is connected to the liquid inlet channel; the channel runs through the valve body, and is sealed at both ends with screw plugs. The channel is connected to the liquid inlet cavity of the plug-in reversing valve core assembly 320, and is sealed at both ends; at the same time, another channel is connected to the liquid inlet cavity of the pilot valve 200 through a precision filter via a plug-in liquid inlet check valve. The channel runs through the valve body and is sealed at both ends; in addition, the main liquid return port on the valve body is connected to the liquid return channel; the liquid return channel runs through the valve body, is sealed at both ends, and is respectively connected to the liquid return cavity of the plug-in reversing valve 2000 group; the liquid return port of the electromagnetic pilot valve 200 is connected to the main liquid return port through the plug-in liquid return check valve.

The pilot valve 200 also includes a threaded sleeve, a press sleeve, a guide sleeve, a first magnetic ball, a push rod and a second magnetic ball arranged in the valve seat 212. The press sleeve is arranged between the valve seat 212 and the guide sleeve. A first pressure rod 23 hole combination is arranged in the press sleeve, a second pressure rod 23 hole is arranged in the guide sleeve, and the second magnetic ball is arranged in the first pressure rod 23 hole combination. After the pressure rod 23 passes through the first pressure rod 23 hole combination and the second pressure rod 23 hole in turn, it is connected to the lever assembly 20 through a screw fine-tuning combination. The structure of the guide sleeve, the press sleeve and the pressure rod 23 is simple, which reduces high-pressure leakage points, reduces failure points, and improves service life.

In some embodiments, the first pressure rod 23 hole combination includes a large hole of the pressure sleeve and a small hole of the pressure sleeve. The pressure rod 23 is provided with a pressure rod 23 head and a pressure rod 23 rod. The pressure rod 23 head moves in the large hole of the pressure sleeve to control the conduction and closing of the second magnetic ball. The pressure rod 23 rod passes through the small hole of the pressure sleeve and the second pressure rod 23 hole. The structure is stable and reliable. A sealing ring installation groove is provided on the guide sleeve, and an O-ring is provided in the sealing ring installation groove. The O-ring does not bear high-pressure liquid, which reduces the risk of leakage and has a good sealing effect.

The pilot valve 200 also includes a connecting plate 500, the left end of the connecting plate 500 is connected to the pilot valve body 210, and the right end of the connecting plate 500 is connected to the piezoelectric actuator 100, that is, when the piezoelectric actuator 100 is connected to the pilot valve 200, the connecting plate 500 and the pilot valve body 210 are first fixed by screws, and then the piezoelectric actuator 100 is screwed into the mounting hole on the connecting plate 500 through the locking nut 15 until there is a small gap between the output shaft of the piezoelectric actuator 100 and the far end of the lever assembly 20, usually -mm, and finally the piezoelectric actuator 100 is retracted using the retraction nut to complete the installation of the piezoelectric actuator 100. When the position of the piezoelectric actuator 100 needs to be adjusted, the initial installation position of the piezoelectric actuator 100 is adjusted by the adjustment component 6 to improve the installation efficiency of the piezoelectric actuator 100.

In some embodiments, the pilot valve 200 further includes a protective cover 17 , which is sleeved on the outside of the piezoelectric actuator 100 and connected to the pilot valve body 210 .

In some embodiments, the protective cover 17 is mounted on the outside of the piezoelectric actuator 100 to protect the piezoelectric actuator 100. At the same time, the appearance of the piezoelectric actuator 100 is changed to improve the aesthetics, and the dustproof, waterproof and explosion-proof performance of the piezoelectric actuator 100 can be improved by providing a protective cover 17 on the outside of the piezoelectric actuator 100.

In some embodiments, the wires of the two piezoelectric actuators 100 are connected to a terminal block 400 , which is a multi-core wire connector.

In some embodiments, the pilot valve 200 also includes a spring seat 18 and a third elastic member 19. The spring seat 18 is disposed in the valve seat 212. One end of the spring seat 18 abuts against the pressure rod 23, and the other end of the spring seat 18 abuts against the third elastic member 19. The reversing assembly includes a reversing valve 2000 body and a reversing valve core assembly 320. The reversing valve core assembly 320 is disposed in the reversing valve 2000 body, and the reversing valve 2000 body is connected to the pilot valve body 210.

In some embodiments, the spring seat 18 is disposed in the valve seat 212, the right end of the spring seat 18 abuts against the pressure rod 23, and the left end of the spring seat 18 abuts against the third elastic member 19. The arrangement of the spring seat 18 and the third elastic member 19 can improve the sealing performance of the pilot valve 200. The upper end of the reversing valve 2000 body is connected to the lower end of the pilot valve body 210, the reversing assembly is disposed in the reversing valve 2000 body and communicates with the pilot valve 200, and the piezoelectric actuator 100 drives the pilot valve 200 to open and drives the movement of the reversing valve 2000.

In the embodiment of the present disclosure, the number of the pilot valves 200 can be set to 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15.

As shown in FIG. 16 and FIG. 17 , the reversing valve 2000 of the embodiment of the present disclosure includes a pilot valve 200 and a reversing assembly. The pilot valve 200 is connected to the reversing assembly. The pilot valve 200 is the pilot valve 200 described in any one of the above embodiments.

In some embodiments, the pilot valve 200 is connected to the reversing assembly, and the pilot valve 200 includes a pilot valve body 210 and a pilot valve core assembly 220. The pilot valve core assembly 220 is disposed in the pilot valve body 210, and the lower end of the pilot valve 200 is connected to the upper end of the reversing assembly. The left end of the piezoelectric actuator 100 is connected to the right end of the pilot valve 200. The pilot valve 200 is disposed in the pilot valve body 210, and the right end of the pilot valve body 210 is connected to the left end of the piezoelectric actuator 100. The pressure rod 23 is penetrated into the valve seat 212, and the left end of the driving component 2 is connected to the right end of the pressure rod 23. The left and right movement of the driving component 2 drives the pressure rod 23 to move in the left and right directions.

As shown in the figure, the control system of the reversing valve 2000 of the embodiment of the present disclosure includes a control unit 1000, multiple independent reversing valves 2000 and a transformer 25. The control unit 1000 is respectively connected to the multiple reversing valves 2000, and the multiple reversing valves 2000 each include a reversing valve 2000 body and a relay 24. One end of the relay 24 is connected to the control unit 1000, and the other end of the relay 24 is connected to the reversing valve 2000 body. One end of the transformer 25 is connected to a power supply, and the other end of the transformer 25 is respectively connected to the relays 24 in the multiple reversing valves 2000.

In some embodiments, as shown in the figure, the control unit 1000 includes a host computer 26, a first controller 27 and a second controller 28, the signal input ends of the first controller 27 and the second controller 28 are respectively connected to the host computer 26, and the signal output ends of the first controller 27 and the second controller 28 are respectively connected to the relay 24.

In the embodiment of the present disclosure, the first controller 27 is a common switch controller, which is used to receive commands from the host computer 26 and output a switch signal to control the relay 24. When the host computer 26 issues an "on" command, the first controller 27 outputs an excitation amount to turn on the relay 24; when the host computer 26 issues an "off" command, the first controller 27 outputs an excitation amount to turn on the relay 24. 27 stops outputting the excitation quantity, so that the relay 24 is closed.

The second controller 28 is a PWM switch controller that receives commands from the host computer 26, outputs a pulse width modulation signal, and controls the relay 24. The pulse width modulation range is 0-100%, and the pulse frequency is 0-10000 Hz.

When the change of the excitation amount of relay 24 reaches the specified requirement, the high voltage inlet and outlet are turned on; otherwise, they are turned off. The voltage of the high voltage terminal of relay 24 is 0-1000V and the current is 0-40A; the voltage of the excitation terminal of relay 24 is 0-48V and the current is 0-2A.

It should be noted that the output ends of the PWM switch controller and the common switch controller usually have N channels, and each channel controls a group of relays 24 and piezoelectric actuators 100. N is an arbitrary constant. That is, the output numbers of the two controllers can be combined arbitrarily.

The transformer 25 is used to convert the low-voltage direct current input by the power supply into high-voltage electricity that meets the requirements of the piezoelectric actuator 100. The voltage requirement of the piezoelectric actuator 100 is generally 0-1000V, and the voltage that can be provided by the working environment is generally 0-220V.

The control system of the reversing valve 2000 of the embodiment of the present disclosure controls the opening and closing of the reversing valve 2000 body by setting the first controller 27 and the second controller 28 to control the opening of the relay 24 simultaneously or separately, thereby improving the flow control accuracy of the fluid reversing valve 2000 control system.

The piezoelectric actuator 100 of the embodiment of the present disclosure includes: a shell 1; a driving component 2, which is arranged in the shell 1 and can move in the length direction of the shell 1; a piezoelectric ceramic piece 3 and a cable 4, the shell 1 has a chamber 11, the piezoelectric ceramic piece 3 is arranged in the chamber 11, one end of the cable 4 passes through the shell 1 and is connected to one end of the piezoelectric ceramic piece 3, and the other end of the piezoelectric ceramic piece 3 is connected to the driving component 2; a rocker 5, one end of the rocker 5 is pivotally connected to the shell 1, the other end of the rocker 5 can swing, and the rocker 5 abuts against the driving component 2.

In some embodiments, the piezoelectric actuator 100 further includes an adjusting component 6 , which is used to adjust the depth of the end of the rocker rod 5 away from the housing 1 extending into the control valve body 211 .

In some embodiments, the driving component 2 includes a driving block 21 and a driving rod 22 that are detachably connected, the adjusting assembly 6 is disposed in the shell 1, and the adjusting assembly 6 includes a connecting sleeve 61, the connecting sleeve 61 is passed through the driving block 21, the driving rod 22 extends into the connecting sleeve 61, and the depth of the driving rod 22 extending into the connecting sleeve 61 is adjustable.

In some embodiments, the driving component 2 includes an integrally formed driving block 21 and a driving rod 22, the adjusting component 6 is disposed outside the shell 1, the adjusting component 6 is connected to the rocker arm 5, and the adjusting component 6 is connected to one end of the rocker arm 5 away from the shell 1, the adjusting component 6 includes an adjusting rod 62, the adjusting rod 62 is passed through the rocker arm 5, and the adjusting rod 62 is movable in the length direction of the shell 1, and one end of the adjusting rod 62 is suitable for extending into the control valve body 211.

In some embodiments, the piezoelectric actuator 100 also includes a first elastic member 7, which is disposed in the chamber 11. The first elastic member 7 is sleeved on the driving component 2, and one end of the first elastic member 7 abuts against a side of the driving component 2 away from the piezoelectric ceramic sheet 3, and the other end of the first elastic member 7 abuts against the inner wall surface of the shell 1.

In some embodiments, the distance between the end of the swing rod 5 away from the pivot point and the pivot point is D1, the distance between the contact point between the driving component 2 and the swing rod 5 and the pivot point of the swing rod 5 is D2, and D1:D2=1 to 10.

The control valve of the embodiment of the present disclosure includes: a control valve body 211 and a valve core 10, the valve core 10 is arranged on the control valve body 211 The piezoelectric actuator 100 is connected to the control valve body 211, and the piezoelectric actuator 100 is the piezoelectric actuator 100 of any one of the above-mentioned embodiments; the transmission rod 11, one end of the transmission rod 11 is abutted against the rocker rod 5, and the other end of the transmission rod 11 is abutted against the valve core 10, or, one end of the transmission rod 11 is abutted against the adjusting rod 62, and the other end of the transmission rod 11 is abutted against the valve core 10.

In some embodiments, a receiving groove is provided in the valve core 10 , and a connecting hole 101 is provided on the valve core 10 , one end of the connecting hole 101 is connected to the liquid inlet, and the other end of the connecting hole 101 is communicated with the receiving groove.

In some embodiments, the control valve further includes an end cover 13 and a second elastic member 14 . The end cover 13 is connected to the control valve body 211 to seal the control valve body 211 . One end of the second elastic member 14 away from the valve core 10 abuts against the end cover 13 .

In some embodiments, the control valve further includes a first sealing ring 12 , which is sleeved on the end cover 13 , and the first sealing ring 12 is located between the end cover 13 and the control valve body 211 .

In some embodiments, the connection distance between the driving rod 22 and the transmission rod 11 is adjustable.

In some embodiments, the thrust generated by the driving rod 22 is F1 , the resistance of the valve core 10 is F2 , and F1 > F2 .

The pilot valve 200 of the embodiment of the present disclosure includes: a pilot valve body 210; a pilot valve core assembly 220, the pilot valve core assembly 220 is arranged in the pilot valve body 210, the pilot valve core assembly 220 includes a valve seat 212 and a pressure rod 23, the pressure rod 23 is penetrated in the valve seat 212, and the pressure rod 23 is movable in the length direction of the valve seat 212; a piezoelectric actuator 100, the piezoelectric actuator 100 is the piezoelectric actuator 100 in the above embodiment, the piezoelectric actuator 100 includes a driving component 2, the driving component 2 is connected to one end of the pressure rod 23 away from the valve seat 212, and the driving component 2 can drive the pressure rod 23 to move in the length direction of the valve seat 212.

In some embodiments, the pilot valve 200 further includes a protective cover 17 , which is sleeved on the outside of the piezoelectric actuator 100 and connected to the pilot valve body 210 .

In some embodiments, the pilot valve 200 further includes a spring seat 18 and a third elastic member 19 . The spring seat 18 is disposed in the valve seat 212 . One end of the spring seat 18 abuts against the pressure rod 23 , and the other end of the spring seat 18 abuts against the third elastic member 19 .

The reversing valve 2000 of the embodiment of the present disclosure includes: a pilot valve 200 and a reversing assembly. The pilot valve 200 is connected to the reversing assembly. The pilot valve 200 is the pilot valve 200 of any of the above embodiments.

In some embodiments, the reversing assembly includes a reversing valve 2000 body and a reversing valve core assembly 320 . The reversing valve core assembly 320 is disposed in the reversing valve 2000 body, and the reversing valve 2000 body is communicated with the pilot valve body 210 .

The control system of the reversing valve 2000 of the embodiment of the present disclosure includes: a control unit 1000; a plurality of independent reversing valves 2000, the reversing valve 2000 is the reversing valve 2000 of the above-mentioned embodiment, the control unit 1000 is respectively connected to the plurality of reversing valves 2000, the plurality of reversing valves 2000 each include a reversing valve 2000 body and a relay 24, one end of the relay 24 is connected to the control unit 1000, and the other end of the relay 24 is connected to the reversing valve 2000 body; a transformer 25, one end of the transformer 25 is suitable for being connected to a power supply, and the other end of the transformer 25 is respectively connected to the relays 24 in the plurality of reversing valves 2000.

In some embodiments, the reversing valve 2000 body includes a pilot valve 200 assembly and a reversing assembly, the pilot valve 200 assembly is connected to the reversing assembly, the pilot valve 200 assembly includes a pilot valve body 210 and a pilot valve core assembly 220, the pilot valve core assembly 220 is arranged in the pilot valve body 210, the pilot valve core assembly 220 includes a valve seat 212 and a pressure rod 23, the pressure rod 23 is inserted in the valve seat 212, and the pressure rod 23 is movable in the length direction of the valve seat 212; the piezoelectric actuator 100, the piezoelectric actuator 100 includes The driving component 2 is connected to an end of the pressure rod 23 away from the valve seat 212 , and the driving component 2 can drive the pressure rod 23 to move in the length direction of the valve seat 212 .

In the present disclosure, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present disclosure.

Claims (19)

A piezoelectric actuator, comprising: case; A driving component, the driving component is disposed in the housing and is movable in the length direction of the housing; A piezoelectric ceramic sheet and a cable, wherein the housing has a chamber, the piezoelectric ceramic sheet is arranged in the chamber, one end of the cable passes through the housing and is connected to one end of the piezoelectric ceramic sheet, and the other end of the piezoelectric ceramic sheet is connected to the driving component; A swing rod, one end of which is pivotally connected to the housing, the other end of which is swingable, and the swing rod is in contact with the driving component. The piezoelectric actuator according to claim 1 is characterized in that it also includes an adjustment component, wherein the adjustment component is used to adjust the depth of the end of the rocker arm away from the housing extending into the control valve body. The piezoelectric actuator according to claim 2 is characterized in that the driving component includes a driving block and a driving rod that are detachably connected, the adjusting assembly is arranged in the shell, and the adjusting assembly includes a connecting sleeve, the connecting sleeve is passed through the driving block, the driving rod extends into the connecting sleeve, and the depth of the driving rod extending into the connecting sleeve is adjustable. The piezoelectric actuator according to claim 2 is characterized in that the driving component includes an integrally formed driving block and a driving rod, the adjusting component is arranged outside the shell, the adjusting component is connected to the rocker arm, and the adjusting component is connected to one end of the rocker arm away from the shell, the adjusting component includes an adjusting rod, the adjusting rod is inserted into the rocker arm, and the adjusting rod is movable in the length direction of the shell, and one end of the adjusting rod is suitable for extending into the control valve body. The piezoelectric actuator according to any one of claims 1-4 is characterized in that it also includes a first elastic member, the first elastic member is arranged in the chamber, the first elastic member is sleeved on the driving component, and one end of the first elastic member abuts against a side of the driving component away from the piezoelectric ceramic sheet, and the other end of the first elastic member abuts against the inner wall surface of the shell. The piezoelectric actuator according to any one of claims 1-4 is characterized in that the distance between the end of the rocker arm away from the pivot point and the pivot point is D1, the distance between the abutment point of the driving component and the rocker arm and the pivot point of the rocker arm is D2, and D1:D2=1 to 10. A control valve, characterized by comprising: A control valve body and a valve core, wherein the valve core is arranged in the control valve body and the valve core is movable in the length direction of the control valve body; A piezoelectric actuator, wherein the piezoelectric actuator is connected to the control valve body, and the piezoelectric actuator is the piezoelectric actuator according to any one of claims 1 to 6; A transmission rod, one end of which is in contact with the rocker arm, and the other end of which is in contact with the valve core, or one end of which is in contact with the regulating rod, and the other end of which is in contact with the valve core. The control valve according to claim 7 is characterized in that a receiving groove is provided in the valve core, and a connecting hole is provided on the valve core, one end of the connecting hole is connected to the liquid inlet, and the other end of the connecting hole is communicated with the receiving groove. The control valve according to claim 7 is characterized in that it also includes an end cover and a second elastic member, wherein the end cover is connected to the control valve body to seal the control valve body, and one end of the second elastic member away from the valve core abuts against the end cover. The control valve according to claim 9 is characterized in that it also includes a first sealing ring, wherein the first sealing ring is sleeved on the end cover, and the first sealing ring is located between the end cover and the control valve body. The control valve according to claim 9, characterized in that a connection distance between the drive rod and the transmission rod is adjustable. The control valve according to claims 7 to 11 is characterized in that the thrust generated by the driving rod is F1, the resistance of the valve core is F2, and F1>F2. A pilot valve, characterized by comprising: Pilot valve body; A pilot valve core assembly, the pilot valve core assembly is arranged in the pilot valve body, the pilot valve core assembly comprises a valve seat and a pressure rod, the pressure rod is inserted into the valve seat, and the pressure rod is movable in the length direction of the valve seat; The piezoelectric actuator is the piezoelectric actuator described in claims 1-6, and the piezoelectric actuator includes a driving component, which is connected to an end of the pressure rod away from the valve seat, and the driving component can drive the pressure rod to move in the length direction of the valve seat. The pilot valve according to claim 13 is characterized in that it also includes a protective cover, which is sleeved on the outside of the piezoelectric actuator and connected to the pilot valve body. The pilot valve according to claim 13 or 14 is characterized in that it also includes a spring seat and a third elastic member, wherein the spring seat is arranged in the valve seat, one end of the spring seat abuts against the pressure rod, and the other end of the spring seat abuts against the third elastic member. A reversing valve, characterized by comprising: A pilot valve and a reversing assembly, wherein the pilot valve is connected to the reversing assembly, and the pilot valve is the pilot valve described in any one of claims 13-15. The reversing valve according to claim 11, characterized in that: The reversing assembly comprises a reversing valve body and a reversing valve core assembly, wherein the reversing valve core assembly is arranged in the reversing valve body. And the reversing valve body is communicated with the pilot valve body. A reversing valve control system, characterized by comprising: control unit; A plurality of mutually independent reversing valves, wherein the reversing valve is the reversing valve described in claim 16 or 17, wherein the control unit is respectively connected to the plurality of the reversing valves, and the plurality of the reversing valves each comprises a reversing valve body and a relay, wherein one end of the relay is connected to the control unit, and the other end of the relay is connected to the reversing valve body; A transformer, one end of which is suitable for being connected to a power source, and the other end of which is respectively connected to relays in the plurality of reversing valves. The reversing valve control system according to claim 18 is characterized in that the reversing valve body comprises a pilot valve assembly and a reversing assembly, the pilot valve assembly is connected to the reversing assembly, the pilot valve assembly comprises a pilot valve body and a pilot valve core assembly, the pilot valve core assembly is arranged in the pilot valve body, the pilot valve core assembly comprises a valve seat and a pressure rod, the pressure rod is inserted into the valve seat, and the pressure rod is movable in the length direction of the valve seat; The piezoelectric actuator comprises a driving component, wherein the driving component is connected to an end of the pressure rod away from the valve seat, and the driving component can drive the pressure rod to move in the length direction of the valve seat.