WO2021098301A1 - Magnetic rotor assembly and electronic expansion valve - Google Patents

Abstract

Provided is a magnetic rotor assembly, which comprises: a rotor (20) that has a mounting hole (21) provided on an end surface thereof; a stopper (30), wherein the stopper (30) is arranged inside the rotor (20) and rotates synchronously with the rotor (20), an end surface of the stopper (30) is provided with a protrusion (31), the protrusion (31) extends into the mounting hole (21), and one end of the protrusion (31) running through the mounting hole (21) is provided with a block flange (32) for blocking the protrusion (31) from exiting the mounting hole (21). The described structure solves the problem of severe deformation of a stopper during injection molding of an electronic expansion valve in the prior art. At the same time, an electronic expansion valve comprising said magnetic rotor assembly is disclosed.

Description

Magnetic rotor assembly and electronic expansion valve Technical field

This application relates to the technical field of valves, and specifically to a magnetic rotor assembly and an electronic expansion valve.

Background technique

As a special material component, the magnetic rotor is not suitable for processing into an asymmetrical shape in structure. In the fields of solenoid valves, electronic expansion valves, etc., because the magnetic rotor itself is not easy to be hit, it is usually installed by connecting parts with a stop function. The part that can be hit is the stopper.

The existing processing technology of the electronic expansion valve usually uses the direct injection molding method to connect the magnetic steel to the magnetic steel on the outside of the stopper. However, due to the high temperature and pressure generated when the magnetic steel is injected, and due to the stop Most of the actuators are made of resin parts, so the stopper is very prone to deformation and serious deformation during injection molding.

Summary of the invention

The main purpose of this application is to provide a magnetic rotor assembly and an electronic expansion valve to solve the problem of serious deformation of the stopper of the electronic expansion valve in the prior art during injection molding.

In order to achieve the above objective, according to an optional embodiment of the present application, a magnetic rotor assembly is provided, including: a rotor, an end surface of the rotor is provided with a mounting hole; a stopper, the stopper is arranged in the rotor and connected to the rotor Synchronous rotation, the end surface of the stopper has a protrusion, the protrusion extends into the installation hole, and the end of the protrusion passing through the installation hole has a stop flange that prevents the protrusion from exiting the installation hole.

In an alternative embodiment, the stop flange extends in the radial direction of the protrusion.

In an alternative embodiment, the maximum diameter of the stop flange is greater than the diameter of the mounting hole.

In an alternative embodiment, the mounting hole is eccentrically arranged with respect to the axis of the rotor.

In an optional embodiment, there are multiple mounting holes and protrusions, which are arranged along the circumferential direction of the rotor, and each protrusion corresponds to one mounting hole.

In an optional embodiment, the rotor includes: an outer sleeve, the stopper is located in the inner cavity of the outer sleeve; a connecting plate, the connecting plate is connected to the outer sleeve, and the connecting plate has a mounting hole.

In an optional embodiment, the inner wall of the outer sleeve is circumferentially provided with a ring groove, and the outer edge of the connecting plate is partially embedded in the ring groove.

According to an optional embodiment of the present application, there is provided an electronic expansion valve, including: a valve seat assembly; the above-mentioned magnetic rotor assembly, the magnetic rotor assembly is rotatably arranged in the valve seat assembly; a nut, and the nut is arranged in the valve seat assembly. Inside the seat assembly; the spool assembly, the spool assembly is threaded on the nut and threaded with the nut, the spool assembly is connected with the magnetic rotor assembly and both rotate synchronously, and the spool assembly changes its position with the seat assembly The relationship controls the on-off state of the electronic expansion valve.

In an optional embodiment, the inner wall of the stopper of the magnetic rotor assembly has a first stop boss, the outer wall of the nut has a second stop boss, and the first stop boss can be connected to the second stop boss. The stop boss contacts the stop to control the axial movement range of the valve core assembly.

In an optional embodiment, the end surface of the stopper is provided with a demolding hole, and along the axial direction of the stopper, the demolding hole is aligned with the first stop boss.

Applying the technical solution of the present application, by opening a mounting hole on the rotor and a protrusion on the stopper, the stopper and the rotor are connected by the cooperation between the protrusion and the mounting hole, and the rotational force of the rotor will pass The squeezing protrusion drives the stopper to rotate together, so as to realize the synchronous rotation of the two, and in order to ensure the reliability of the connection between the rotor and the stopper, and to prevent the stopper from falling off the rotor, the protrusion passes through the mounting hole A stop flange is provided at one end of the spool, and the stop flange can obstruct the protrusion from exiting the mounting hole, so as to achieve a firm fixation of the stopper on the rotor. On the basis of realizing the reliable and stable connection between the stopper and the rotor, the above arrangement method does not require injection molding in the whole process, and will not cause large deformation of the stopper, thereby ensuring the shape stability of the stopper.

Description of the drawings

The drawings of the specification forming a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

Figure 1 shows a schematic structural view of the magnetic rotor assembly of the present application when a stop flange is processed after the stopper is installed on the rotor;

Fig. 2 shows a schematic structural diagram of the magnetic rotor assembly in Fig. 1 when the stopper is initially installed on the rotor;

Fig. 3 shows a schematic structural view of the stopper of the magnetic rotor assembly in Fig. 2 when it is not installed on the rotor;

Fig. 4 shows a schematic structural view of the stopper in Fig. 3 from another perspective;

Figure 5 shows a schematic structural diagram of the electronic expansion valve of the present application.

Among them, the above drawings include the following reference signs:

10. Valve seat assembly; 20. Rotor; 21. Mounting hole; 22. Outer sleeve; 23. Connecting plate; 30. Stopper; 31. Protrusion; 32. Stop flange; 33. First stop Boss; 34, demolding hole; 40, nut; 41, second stop boss; 50, valve core assembly; 60, guide sleeve.

Detailed ways

It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present application will be described in detail with reference to the drawings and in conjunction with the embodiments.

In order to solve the problem of serious deformation of the stopper of the electronic expansion valve in the prior art during injection molding, the present application provides a magnetic rotor assembly and an electronic expansion valve.

A magnetic rotor assembly as shown in Figures 1 to 4 includes a rotor 20 and a stopper 30. The end surface of the rotor 20 is provided with a mounting hole 21; the stopper 30 is arranged in the rotor 20 and rotates synchronously with the rotor 20, The end surface of the stopper 30 has a protrusion 31 that extends into the mounting hole 21, and one end of the protrusion 31 passing through the mounting hole 21 has a stop flange 32 that prevents the protrusion 31 from exiting the mounting hole 21.

In this embodiment, a mounting hole 21 is provided on the rotor 20, and a protrusion 31 is provided on the stopper 30. The stopper 30 is connected to the rotor 20 by the fit between the protrusion 31 and the mounting hole 21, and the rotor 20 is The rotation force will drive the stopper 30 to rotate together through the extrusion protrusion 31, so as to realize the synchronous rotation of the two, and in order to ensure the reliability of the connection between the rotor 20 and the stopper 30, prevent the stopper 30 from moving from the rotor 20 The stopper flange 32 is provided at one end of the protrusion 31 passing through the mounting hole 21. The stopper flange 32 can prevent the protrusion 31 from exiting the mounting hole 21, so that the stopper 30 can be firmly fixed to the rotor 20. on. The above arrangement method realizes the reliable and stable connection of the stopper 30 and the rotor 20, and the whole process does not require injection molding, which will not cause the stopper 30 to be greatly deformed, thereby ensuring the stopper 30 Stable shape.

Preferably, the stop flange 32 extends in the radial direction of the protrusion 31, and the maximum diameter of the stop flange 32 is greater than the diameter of the mounting hole 21. For ease of processing, the mounting hole 21 and the stop flange 32 are generally processed into a circle. In this way, the diameter of the stop flange 32 is larger than the diameter of the mounting hole 21. In this way, the stop flange 32 can cover the entire mounting hole 21 so that the protrusion 31 cannot escape from the mounting hole 21. Of course, the stop flange 32 can also be processed into other shapes, such as semicircular, rectangular, etc., as long as the distance between the two furthest points on the stop flange 32 is greater than the diameter of the mounting hole 21.

It should be noted that the stop flange 32 is not always present on the protrusion 31, but is processed during the process of installing the stopper 30 on the rotor 20. Specifically, as shown in Figures 1 and 2, when the stopper 30 is not mounted on the rotor 20, the protrusion 31 is cylindrical, and there is no stop flange 32 on it. When mounting, first Pass the protrusion 31 through the mounting hole 21 so that the stopper 30 is initially connected to the rotor 20, and then ultrasonic welding or thermal riveting is performed on the end of the protrusion 31 on the stopper 30 that passes through the mounting hole 21. The object touches the surface of the protrusion 31 and presses it down. Since the stopper 30 is a resin injection molded part, one end of the protrusion 31 will melt and become soft. At the same time, under the downward pressure, the end of the protrusion 31 will become thicker to form a The mushroom spherical surface forms the stop flange 32, and the stop flange 32 is closely attached to the rotor 20 to prevent the stopper 30 from shaking relative to the rotor 20. The fixing effect can be achieved after the stop flange 32 is cooled. .

In this embodiment, since the protrusion 31 and the mounting hole 21 are both circular, in order to ensure the synchronous rotation of the rotor 20 and the stopper 30, the mounting hole 21 is eccentrically arranged with respect to the axis of the rotor 20 to ensure the effect of synchronous rotation. ,as shown in picture 2. Of course, if the shape of the protrusion 31 and the mounting hole 21 is not a symmetrical circle, but a square, prism, etc. capable of transmitting torque, the protrusion 31 and the mounting hole 21 can be arranged at the axis of the rotor 20.

Optionally, there are multiple mounting holes 21 and protrusions 31, and they are arranged along the circumferential direction of the rotor 20, and each protrusion 31 corresponds to one mounting hole 21. This embodiment is provided with three protrusions 31 and four mounting holes 21, the four mounting holes 21 are spaced at 90 degrees in the circumferential direction, two adjacent ones of the three protrusions 31 are spaced at 90 degrees or 180 degrees, and the three protrusions 31 corresponds to the three mounting holes 21, and the remaining one mounting hole 21 does not play a role. The reason why there are only three protrusions 31 is that there is interference between the protrusions 31 of the present embodiment and the demolding holes 34 on the stopper 30. In order to ensure the smooth progress of the film release process of the stopper 30, it needs to be reserved. For the demolding hole 34, the protrusion 31 at the position of the demolding hole 34 is removed, and the reason why the four mounting holes 21 are still reserved is to facilitate processing and installation. Of course, the specific number and corresponding relationship of the protrusions 31 and the mounting holes 21 can also be changed according to actual conditions.

Optionally, part or all of the rotor 20 is made of a magnetic material, and the stopper 30 is made of a non-magnetic material. In this way, the magnetic rotor 20 can be rotated by the drive of an external coil, and the non-magnetic stopper 30 is convenient The processing and connection can also reduce the cost, and the non-magnetic material is integrated on the magnetic material to solve the problem that the magnetic properties of the rotor 20 are reduced after being stressed and it is not suitable for being impacted.

In this embodiment, the rotor 20 includes an outer sleeve 22 and a connecting plate 23. The stopper 30 is located in the inner cavity of the outer sleeve 22; the connecting plate 23 is connected to the outer sleeve 22, and the connecting plate 23 has a mounting hole 21 and The central hole for the spool assembly 50 of the electronic expansion valve to pass through.

Specifically, the outer sleeve 22 is a magnetic component as a whole, preferably a magnetic steel. A ring groove is provided on the side wall of the inner cavity, and the ring groove is provided in a circle along the circumference of the inner wall. The outer edge of the connecting plate 23 is embedded in In the ring groove, the process can be completed by an injection molding process, so that the connecting plate 23 and the outer sleeve 22 can be connected together to form the entire rotor 20. The mounting hole 21 is opened on the connecting plate 23, the thickness of the connecting plate 23 itself does not need to be too thick, and the mounting hole 21 is less difficult to process.

This embodiment also provides an electronic expansion valve, as shown in FIG. 5, comprising a valve seat assembly 10, the above-mentioned magnetic rotor assembly, a nut 40, and a valve core assembly 50. The magnetic rotor assembly is rotatably arranged on the valve seat assembly 10. The nut 40 is arranged in the valve seat assembly 10; the middle of the outer sleeve 22 of the rotor 20 has an inner cavity, and the nut 40, the valve core assembly 50 and the stopper 30 are all penetrated or accommodated in the inner cavity, and A central hole is opened at the axis of the connecting plate 23. The central hole is generally larger and is used for the spool assembly 50 to pass through, so as to connect the spool assembly 50 and the top block together; the spool assembly 50 passes through the nut The valve core assembly 50 is connected to the magnetic rotor assembly and rotates synchronously. The valve core assembly 50 controls the on-off state of the electronic expansion valve by changing the positional relationship with the valve seat assembly 10.

In this embodiment, the inner wall of the stopper 30 has a first stop boss 33, and the outer wall of the nut 40 has a second stop boss 41, and the first stop boss 33 can interact with the second stop boss. 41 contacts the stop to control the axial movement range of the valve core assembly 50. The number of the first stop boss 33 and the second stop boss 41 can be set as required. In this embodiment, two first stop bosses 33 are provided, and they are located at the stop along the axial direction of the stopper 30. At both ends of the actuator 30, one second stop boss 41 is provided. The two first stop bosses 33 cooperate with the second stop boss 41 to realize the limit of the upper and lower positions of the valve core assembly 50. .

Since one end of the stopper 30 of this embodiment is open and the other end is shielded, the first stop boss 33 at the end far away from the opening can be integrally molded and injection molded when the stopper 30 is processed, and the first stop near the open The stop boss 33 needs to be processed again, and a demolding process is required in this process. Therefore, in order to facilitate demolding, a demolding hole 34 is also opened on the end face of the stopper 30 shielded by this. The ejection holes 34 are provided so that only three protrusions 31 are provided.

In this embodiment, the electronic expansion valve further includes a guide sleeve 60. The valve seat assembly 10 includes three parts: an upper sleeve, a lower valve seat, and a valve seat core. The upper sleeve and the lower valve seat jointly form a valve cavity containing the component. A through hole is respectively provided on the side and bottom surface of the lower valve seat to communicate with the first connecting pipe and the second connecting pipe respectively. A valve core seat is provided at the through hole on the bottom surface, the valve core seat has a central through hole, and the valve core assembly 50 is matched with the center through hole of the valve core seat to change the opening of the center through hole and realize the control of the electronic expansion valve. At the same time, the guide sleeve 60 is also sleeved on the outside of the valve core seat, thereby connecting with the valve core seat. The core seat is connected, a part of the nut 40 is also sleeved on the outside of the guide sleeve 60, and then pressed and fixed by the pressure plate connected with the valve seat assembly 10, the valve core assembly 50 is simultaneously inserted on the guide sleeve 60 and the nut 40, and the nut 40 is mainly For realizing the axial movement of the spool assembly 50, the guide sleeve 60 is mainly used to guide the movement of the spool assembly 50, so that the spool assembly 50 moves along its axial direction without deflection.

In this embodiment, the valve core assembly 50 includes a valve needle, a screw and a spring. The outer side of the screw has a thread to fit with the nut 40. The valve needle is inserted on the screw, and one end of the valve needle is matched with the valve core seat. To realize the on-off of the electronic expansion valve, the other end of the valve needle is connected to the top block after passing through the connecting plate 23 and abuts against the end of the screw. The spring is arranged in the screw and sleeved outside the valve needle, so that the screw and the valve The needle moves synchronously.

It should be noted that, in addition to being applied to electronic expansion valves, the above-mentioned magnetic rotor assembly can also be applied to other equipment and fields. At this time, the stopper 30 can be used to stop the rotation of the rotor 20, or it can be used as The rotor 20 drives the transmission carrier of other parts to rotate to overcome the problem of insufficient transmission strength of the magnetic material. That is, the function of the so-called stopper 30 is not limited to stop, and it can also be used for transmission.

It should be noted that multiple in the above-mentioned embodiment refers to at least two.

From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

1. It solves the problem of serious deformation of the stopper of the electronic expansion valve in the prior art during injection molding;

2. Use the cooperation between the protrusion and the mounting hole to connect the stopper and the rotor and realize the rotation together;

3. The stop flange can prevent the protrusion from exiting the mounting hole, so that the stopper can be firmly fixed on the rotor;

4. The whole process does not require injection molding, which will not cause large deformation of the stopper, thus ensuring the stability of the stopper;

5. By integrating non-magnetic materials into magnetic materials, the problem of reducing magnetism after the magnetic rotor is stressed is solved.

Obviously, the embodiments described above are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work should fall within the protection scope of this application.

The above descriptions are only preferred embodiments of the application, and are not intended to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included in the protection scope of this application.

Claims (10)

A magnetic rotor assembly, characterized in that it comprises: A rotor (20), an end surface of the rotor (20) is provided with a mounting hole (21); A stopper (30), the stopper (30) is arranged in the rotor (20) and rotates synchronously with the rotor (20), and the end surface of the stopper (30) has a protrusion (31) ), the protrusion (31) extends into the mounting hole (21), and one end of the protrusion (31) passing through the mounting hole (21) has an obstructive effect on the exit of the protrusion (31) The stop flange (32) of the mounting hole (21). The magnetic rotor assembly according to claim 1, wherein the stop flange (32) extends in a radial direction of the protrusion (31). The magnetic rotor assembly according to claim 1, wherein the maximum diameter of the stop flange (32) is greater than the diameter of the mounting hole (21). The magnetic rotor assembly according to claim 1, wherein the mounting hole (21) is eccentrically arranged with respect to the axis of the rotor (20). The magnetic rotor assembly according to claim 1, wherein the mounting holes (21) and the protrusions (31) are both multiple, and are arranged along the circumferential direction of the rotor (20), and each Each of the protrusions (31) corresponds to one of the mounting holes (21). The magnetic rotor assembly according to claim 1, wherein the rotor (20) comprises: The outer sleeve (22), the stopper (30) is located in the inner cavity of the outer sleeve (22); A connecting plate (23), the connecting plate (23) is connected with the outer sleeve (22), and the connecting plate (23) is provided with the mounting hole (21). The magnetic rotor assembly according to claim 6, wherein the inner wall of the outer sleeve (22) is circumferentially provided with a ring groove, and the outer edge of the connecting plate (23) is partially embedded in the ring groove Inside. An electronic expansion valve, characterized in that it comprises: Valve seat assembly (10); The magnetic rotor assembly according to any one of claims 1 to 7, which is rotatably arranged in the valve seat assembly (10); A nut (40), the nut (40) is arranged in the valve seat assembly (10); The valve core assembly (50), the valve core assembly (50) penetrates the nut (40) and is threadedly fitted with the nut (40), and the valve core assembly (50) is connected to the magnetic rotor The components are connected and the two rotate synchronously, and the valve core component (50) controls the on-off state of the electronic expansion valve by changing the positional relationship between the valve core component (50) and the valve seat component (10). The electronic expansion valve according to claim 8, wherein the inner wall of the stopper (30) of the magnetic rotor assembly has a first stop boss (33), and the outer wall of the nut (40) has a first stopper. Two stop bosses (41), and the first stop boss (33) can contact and stop with the second stop boss (41) to control the axis of the valve core assembly (50) To the range of motion. The electronic expansion valve according to claim 9, wherein the end surface of the stopper (30) is provided with a demolding hole (34), and along the axial direction of the stopper (30), the The demolding hole (34) is aligned with the first stop boss (33).

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