CN116336022A - One-way valve for oil cylinder - Google Patents

Abstract

The invention discloses a one-way valve for an oil cylinder, which comprises a flow guide block, wherein a flow channel is arranged in the side wall of the flow guide block, a flow inlet is arranged on the side wall of the flow guide block, one end of the flow guide block is provided with overflow ports, the overflow ports comprise a plurality of flow inlet ports and overflow ports which are communicated through the flow channel; and a choke piece, which seals against the overflow port; the supporting component comprises an elastic piece, the elastic piece is used for driving the flow blocking piece to cover the overflow port, and the flow blocking piece can move away from the overflow port and drive the elastic piece to deform. The overflow ports communicated with the flow channels are arranged, the outflow area is increased, the flow blocking piece can achieve larger radial overflow area only by lifting a small distance, the flow resistance of forward outflow is greatly reduced, and small opening pressure is achieved.

Description

One-way valve for oil cylinder

technical field

The invention belongs to the field of hydraulic equipment, and in particular relates to a check valve for an oil cylinder.

Background technique

One-way valve, also known as check valve, is widely used in the field of hydraulic pressure, and mainly plays the role of one-way conduction and preventing oil from flowing backward. The demand for integrating the check valve inside the cylinder mostly occurs in closed damping cylinders that require high miniaturization and light weight, such as hydraulic gas springs, hydraulic knee prostheses, and reciprocating piston pumps. Existing one-way valve is mainly divided into spring type and springless type.

Springless check valves mainly include lift check valves and swing check valves. The reverse cut-off of the fluid depends on the gravity of the ball or disc inside the valve body to close the orifice. There are also strict requirements on the installation angle, which is easy to cause water hammer effect. Parts are prone to damage. Since the fall of the spool is only driven by gravity, the orifice is not closed in time during this process, which will cause part of the oil to flow back, which cannot be applied to scenarios with high frequency response and strict flow requirements.

Among them, there is a spring-type one-way valve, which provides the positive opening pressure of the raft flap by the pre-tightening force of the spring. In the prior art, the flow area of the inner orifice of the existing direct-acting check valve is relatively small, the opening is small when the pressure difference is small, and the flow resistance of the forward flow is relatively large. The above-mentioned problems are technical problems urgently needed to be solved in this area.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention provides a check valve for an oil cylinder, which can effectively reduce the flow resistance of the positive outflow and realize a smaller cracking pressure.

The technical solution of the present invention to solve the above-mentioned technical problems is as follows: a check valve for an oil cylinder, comprising a flow guide block, a flow channel is arranged in the side wall of the flow guide block, and a flow channel is arranged on the side wall of the flow guide block. An inlet, one end of the diversion block is provided with an overflow port, the overflow port includes a plurality, the inlet port and the overflow port are communicated through the flow channel; and

a flow blocking member sealingly fitted over the overflow opening, the flow blocking member being movable away from the overflow opening; and

A support assembly, the support assembly includes an elastic member, and the elastic member is used to drive the baffle member to reset so as to cover the overflow port.

The beneficial effect of the one-way valve for the oil cylinder disclosed in the application is: the application increases the outflow area by setting a plurality of overflow ports connected with the flow channel, and the flow resistance can be realized by only lifting a small distance. The large radial overflow area greatly reduces the flow resistance of the forward flow, but achieves a small opening pressure.

In an optional embodiment, the deflector block is an annular structure, and a first through hole axially penetrating through the deflector block is provided on the deflector block, and the support assembly further includes a limit block , the limiting block is arranged on the deflector block, the second through hole coaxial with the first through hole is opened on the limiting block, the elastic member is a wave spring, and the wave spring Set on the limit block.

In terms of reverse interception in this application, due to the high rigidity of the wave spring, and the flow blocking part covers multiple overflow ports at the same time, the force bearing area of the flow blocking part is large and the self-weight is light, so the pressure change It is more sensitive, has a faster closure speed, and can adapt to relatively rapid alternating pressure.

In an optional embodiment, one end of the limit block close to the overflow port protrudes from the guide block and is provided with a flange, and the wave spring is located between the flange and the guide block. Between the blocks, the two ends of the wave spring are respectively connected to the flange and the baffle.

In an optional embodiment, a plurality of the overflow ports are arranged around the first through hole, and the flow blocking member has an annular structure and is sleeved on the limiting block.

This application can effectively reduce the volume of this application by setting the diversion block and the limit block as an annular structure, and cooperate with the wave spring and the annular choke reed to meet the geometric characteristics of the oil cylinder, so that when the application is matched with the oil cylinder , which can be installed on the rod side or the rodless side of the cylinder.

In an optional embodiment, the limiting block is sleeved inside the first through hole, and an axial positioning structure is provided on the limiting block, and the axial positioning structure is used to align the The limit block is used for axial positioning.

In an optional embodiment, the outer side of the limiting block is threadedly connected to the inner side of the first through hole.

In an optional embodiment, the axial positioning structure includes a positioning shoulder provided on the limiting block, and the positioning shoulder abuts against the diversion block and is provided with the overflow port on the end face.

In an optional embodiment, an annular groove is provided on the outer side of the deflector block, and the inlet port is arranged in the annular groove.

In an optional embodiment, at least two seals are arranged around the outer side of the deflector block, and the inlet is located between the two seals.

The present application also provides an oil cylinder, which includes the above-mentioned one-way valve and a cylinder body, the one-way valve is integrally sleeved in the cylinder body, the inlet port and the liquid inlet port on the cylinder body butt.

Description of drawings

Fig. 1 is the sectional view of the assembly of the embodiment of the present application in the state of reverse interception;

Fig. 2 is an assembly sectional view of an embodiment of the present application in a forward flow state;

Fig. 3 is the assembly explosion diagram A of the embodiment of the present application;

Fig. 4 is an exploded view B of the assembly of the embodiment of the present application.

Explanation of reference numerals: flow resistance member 1, wave spring 2, diversion block 3, limit block 4, sealing ring 5, cylinder body 6, overflow port 7, flow channel 8, first through hole 9, second through hole Hole 10, flange 11, positioning shoulder 12, annular groove 13, inlet 14.

Detailed ways

The principles and features of the present application are described below in conjunction with the accompanying drawings and embodiments, and the examples given are only used to explain the present application, and are not intended to limit the scope of the present application.

A number of different implementations or examples of implementing the described subject technical solutions are disclosed below. In order to simplify the disclosure, the following describes the specific embodiments of one or more permutations of each feature, but the examples cited are not intended to limit this description, and the first and second features described later in the description are connected, namely It may include an embodiment that is directly connected, and may also include an embodiment that forms additional features. Further, it also includes the use of one or more other intervening features to indirectly connect or combine the first feature and the second feature with each other, so that the first feature and the second feature The second characteristic may not be directly related.

As shown in FIG. 1 to FIG. 4 , the present application discloses an embodiment of a one-way valve for an oil cylinder, including a guide block 3 , a flow blocking member 1 , a support assembly and a limit block 4 .

The flow guide block 3 is an annular sleeve structure as a whole, and the flow guide block 3 is provided with a first through hole 9 axially penetrating the flow guide block 3, and the first through hole 9 can allow the piston rod in the oil cylinder to pass through.

A flow channel 8 is provided in the side wall of the above-mentioned deflector block 3, for example, Fig. 1 and Fig. 2 show a cross-sectional view of the flow channel 8, and the flow channel 8 may be composed of two sections, including a vertical channel and a horizontal channel. The two channels communicate with each other to form the flow channel 8 as a whole. In addition, in some other examples, the flow channel 8 can only be composed of one section, which can be a straight flow channel 8 or a flow channel 8 with a certain degree of curvature. , which is not specifically limited in this application.

Wherein, the present application defines the two ends of the flow channel 8 as the overflow port 7 and the inlet port 14 respectively. In the embodiment disclosed in the present application, as shown in FIGS. On the outside of the side wall of the flow block 3, the above-mentioned overflow port 7 is opened on the end face of the flow guide block 3, and the above-mentioned overflow port 7 includes a plurality of, for example, twelve overflow ports are shown in Figure 3 7, a plurality of overflow ports 7 are arranged around the first through hole 9.

In the embodiments disclosed in the present application, the spoiler 1 is integrally sealed and closed on the overflow port 7, as shown in FIG. 3 . In some examples, the spoiler 1 is an annular spoiler reed. In the example, all the overflow openings 7 can be covered by only one blocking piece 1 .

As shown in Figure 3, the support assembly is used to support the above-mentioned spoiler 1, and the support assembly is composed of an elastic piece and a stopper 4, wherein the stopper 4 is used to fix the elastic piece, and the above-mentioned elastic piece is used to drive The flow blocking part 1 covers the overflow port 7, the flow blocking part 1 can move away from the overflow port 7 and drive the deformation of the elastic part, and the elastic part will drive the flow blocking part 1 to reset in order to reset.

For example, in some examples, as shown in FIG. 3 , the limiting block 4 is arranged coaxially with the deflector block 3 , and the limiting block 4 is provided with a second through hole 10 coaxial with the first through hole 9 . The through hole 10 can also pass through the piston rod of the oil cylinder. The end of the limit block 4 near the overflow port 7 protrudes from the guide block 3 and is provided with a flange 11. In this example, the elastic member is a wave spring 2, and the wave spring 2 The spring 2 is sleeved on the limit block 4 and is located between the flange 11 and the end surface of the flow guide block 3 provided with the overflow port 7. The top end of the wave spring 2 is fixedly connected to the lower surface of the flange 11, and the bottom end Then it is fixedly connected with the spoiler 1, wherein the maximum height from the lower surface of the flange 11 to the upper surface of the spoiler 1 is smaller than the free height of the wave spring 2, so that the spoiler 1 can be squeezed under the elastic force of the wave spring 2. pressure, so as to cover the overflow port 7 to achieve sealing. In some examples, as shown in FIG. It may be composed of several protrusions protruding from the side of the limit block 4 .

In addition, in some examples, as shown in FIG. 1 and FIG. 2 , the end of the above-mentioned limit block 4 away from the flange 11 can be socketed inside the first through hole 9 , for example, the outside of the above-mentioned limit block 4 is provided with an outer thread, the first through hole 9 is internally provided with an internal thread, and the limiting block 4 is threadedly connected to the inner side of the diversion block 3 .

On the basis that the limit block 4 is socketed in the deflector block 3, since the wave spring 2 is connected with the limit block 4, in order to make the limit block 4 be in a proper position in the axial direction, that is, to meet the flange 11 distance The distance of the overflow port 7 needs to be smaller than the free height of the wave spring 2 . An axial positioning structure is also fixed on the limiting block 4 . The axial positioning structure is used for axially positioning the limiting block 4 .

For example, as shown in Figures 1 to 4, the above-mentioned axial positioning structure can be a positioning shoulder 12 fixed on the limit block 4 near the end of the flange 11, and the diameter of the positioning shoulder 12 is between the first through hole 9 and the diameter of the flange 11, when the limit block 4 moves in the axial direction, the upper end surface of the deflector block 3 can block the axial movement of the positioning shoulder 12, thereby achieving axial positioning.

Take the threaded connection of the limiting block 4 and the diversion block 3 as an example. When the limiting block 4 and the diversion block 3 are coaxial, the limiting block 4 is rotated to move in the axial direction. When the limiting block 4 moves to the appropriate At this time, the positioning shoulder 12 of the limiting block 4 is in contact with the upper surface of the diversion block 3, and the diversion block 3 can axially position the limiting block 4 as a whole by blocking the movement of the positioning shoulder 12.

In addition, in some examples, as shown in FIG. 3 , an annular groove 13 is provided on the outside of the deflector block 3 , and the inlet port 14 is arranged in the annular groove 13 .

As shown in Figures 1 and 2, in the embodiment where the application is applied to the oil cylinder, the application is entirely sleeved in the cylinder body 6 of the oil cylinder, and the above-mentioned annular groove 13 is docked with the liquid inlet of the oil cylinder , in a specific application example, two seals need to be set on the upper and lower sides of the annular groove 13, and the seals are used to seal between the cylinder body 6 and the flow guide block 3 to prevent hydraulic oil from passing through the flow guide block 3 and The cylinder block 6 enters into the cylinder block 6, specifically, as shown in Figure 3 and Figure 4, the above-mentioned guide block 3 is located on the upper and lower sides of the annular groove 13 and is provided with an annular locking groove, and the inner locking groove of the annular locking groove A seal ring 5 is combined as a seal.

The overall working principle of this application is as follows:

As shown in Figure 1, when the pressure in the flow channel 8 is lower than the pressure in the cylinder, and the pressure difference between the upper and lower surfaces of the flow resistance member 1 is lower than the elastic force of the wave spring 2, the wave spring 2 supports the flow resistance member 1, Under the action of the wave spring 2 , the flow blocking member 1 blocks the overflow port 7 on the upper surface of the diversion block 3 , and at this time, the liquid cannot enter the flow channel 8 through the overflow port 7 .

As shown in Figure 2, when liquid is injected into the flow channel 8, the pressure in the flow channel 8 is higher than the pressure in the cylinder 6, and when the pressure difference between the upper and lower surfaces of the flow resistance member 1 is higher than the elastic force of the wave spring 2, the flow resistance The component 1 is lifted up by the high-pressure oil in the flow channel 8, and the wave spring 2 is compressed. At this time, the oil can flow into the cylinder body 6 through the overflow port 7.

The application has a ring structure as a whole, which can fit the geometric characteristics of the oil cylinder, and can make the application have a smaller volume, and can be installed on the rod side or the non-rod side of the oil cylinder.

At the same time, by setting a plurality of ring-distributed overflow ports 7, the area where the fluid enters the cylinder body 6 is increased, and the spoiler 1 can realize a large radial overflow area by only lifting a small distance, which greatly reduces the The flow resistance of positive outflow can greatly reduce the cracking pressure.

In addition, this application uses the wave spring 2 as the element to maintain the positive opening pressure of the application, which can save the space in the oil cylinder. In terms of reverse cut-off, due to the high stiffness of the wave spring 2, it cooperates with the annular choke reed, and the choke spring The force-bearing area of the sheet is larger and its weight is lighter, so it is more sensitive to pressure changes, and the interception speed is faster, which can adapt to relatively rapid alternating pressure.

In the description of this specification, it should be understood that the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "inner", "outer", "circumferential", "circumferential" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this The description and simplified description do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the description.

In the description of this specification, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

The terms used in this specification are those general terms currently widely used in the art in consideration of functions about the present disclosure, but the terms may be changed according to the intention of those of ordinary skill in the art, precedents, or new technologies in the art. Also, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the specification should not be understood as simple names, but based on the meaning of the terms and the general description of the present disclosure.

In this description, flow charts or words are used to describe the operation steps performed according to the embodiments of the present application. It should be understood that the operation steps in the embodiments of the present application are not necessarily performed in the exact sequence as recorded. Instead, various steps may be processed in reverse order or concurrently, as desired. At the same time, other operations can be added to these procedures, or a certain step or steps can be removed from these procedures.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection of the application. within range.

Claims (10)

1. The one-way valve for the oil cylinder is characterized by comprising a flow guide block (3), wherein a flow channel (8) is arranged in the side wall of the flow guide block (3), a flow inlet (14) is arranged on the side wall of the flow guide block (3), one end of the flow guide block (3) is provided with an overflow port (7), the overflow port (7) comprises a plurality of overflow ports, and the flow inlet (14) and the overflow port (7) are communicated through the flow channel (8); and

a flow blocking piece (1) which is sealed on the overflow port (7), wherein the flow blocking piece (1) can move away from the overflow port (7); and

the supporting assembly comprises an elastic piece, and the elastic piece is used for driving the flow blocking piece (1) to reset so as to cover the overflow port (7).

2. The one-way valve for the oil cylinder according to claim 1, wherein the flow guiding block (3) is of an annular structure, a first through hole (9) axially penetrating through the flow guiding block (3) is arranged on the flow guiding block (3), the supporting assembly further comprises a limiting block (4), the limiting block (4) is arranged on the flow guiding block (3), a second through hole (10) coaxial with the first through hole (9) is formed in the limiting block (4), the elastic piece is a wave spring (2), and the wave spring (2) is sleeved on the limiting block (4).

3. A non-return valve for an oil cylinder according to claim 2, wherein one end of the limiting block (4) close to the overflow port (7) extends out of the guide block (3) and is provided with a flange (11), the wave spring (2) is located between the flange (11) and the guide block (3), and two ends of the wave spring (2) are respectively abutted with the flange (11) and the choke piece (1).

4. A non-return valve for a cylinder according to claim 2 or 3, characterized in that a plurality of overflow ports (7) are arranged around the first through hole (9), and the flow blocking member (1) is of an annular structure and is sleeved on the limiting block (4).

5. A non-return valve for an oil cylinder according to claim 2 or 3, wherein the stopper (4) is sleeved inside the first through hole (9), and an axial positioning structure is provided on the stopper (4), and the axial positioning structure is used for axially positioning the stopper (4).

6. The one-way valve for the oil cylinder according to claim 5, wherein the outer side of the limiting block (4) is in threaded connection with the inner side of the first through hole (9).

7. A non-return valve for an oil cylinder according to claim 5, characterized in that the axial positioning structure comprises a positioning shoulder (12) provided on the stopper (4), the positioning shoulder (12) being in abutment on the end face of the deflector block (3) provided with the overflow port (7).

8. A non-return valve for a cylinder according to any one of claims 1 to 3, characterized in that the outside of the deflector block (3) is provided with an annular groove (13), the inlet (14) being provided in the annular groove (13).

9. A non-return valve for a cylinder according to any one of claims 1 to 3, characterized in that at least two sealing elements are provided around the outside of the deflector block (3), the inlet opening (14) being located between the two sealing elements.

10. An oil cylinder, characterized by comprising the one-way valve and a cylinder body (6) according to any one of claims 1 to 8, wherein the one-way valve is integrally sleeved in the cylinder body (6), and the flow inlet (14) is in butt joint with a liquid inlet on the cylinder body (6).

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