Electronic expansion valve

Abstract

The utility model provides an electronic expansion valve, which comprises a stator unit, an elastic element, an elastic element, an elastic element, an elastic element, an elastic element, an elastic element and an elastic element, and is characterized in that the center of the stator unit is axially provided with an embedding hole, and the embedding hole comprises an open end and a closed end; and a valve main body, a sleeve is mounted on the valve main body, the sleeve extends into the embedded hole to form a mounting cavity with the closed end, a damping component is arranged in the mounting cavity, and the damping component can be pressed by the sleeve to form a blocking force for blocking the sleeve from acting relative to the stator unit. According to the electronic expansion valve in the scheme, the stability between the stator unit and the valve body and the assembling convenience are effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile, especially electronic expansion valve. BACKGROUND

[0002] The electronic expansion valve is a key part in the automobile thermal management system. The medium-temperature high-pressure refrigerant is throttled into a low-temperature low-pressure gaseous or gas-liquid two-phase state through the valve port of the electronic expansion valve, and then the refrigerant absorbs the heat around the evaporator to achieve the refrigeration effect. However, the electronic expansion valve often vibrates due to external interference during operation, which affects the refrigeration effect of the expansion valve, resulting in failure of the expansion valve and great inconvenience for later maintenance. In the prior art, in order to limit the collision between the sleeve and the stator assembly on the valve body, an O-ring is usually arranged between the sleeve and the stator assembly. The vibration of the valve body is inhibited by the sealing and guiding effect of the O-ring. However, the tight combination of the O-ring and the sleeve forms an air seal, which will cause difficulty in inserting the sleeve during installation. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide an electronic expansion valve to solve the problem of difficult installation of the sleeve in the prior art.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides an electronic expansion valve, comprising:

[0005] A stator unit is provided with an embedded hole in the center along the axial direction, and the embedded hole comprises an open end and a closed end;

[0006] A valve body is provided with a sleeve, the sleeve extends into the embedded hole and forms an installation cavity between the closed end, and a damping component is arranged in the installation cavity, the damping component can be compressed by the sleeve, and the damping component forms a resistance force that hinders the movement of the sleeve relative to the stator unit.

[0007] Optionally, the inner diameter of the closed end decreases in a stepped manner from the open end to the closed end of the embedded hole.

[0008] Optionally, the end of the sleeve in contact with the damping component is provided with a conical platform, the end face of the conical platform is a contact plane for contacting the damping component, and the diameter of the contact plane is smaller than the minimum diameter of the closed end.

[0009] Optionally, the damping component is an elastic member, and the damping component comprises an expanded state and a compressed state; in the expanded state, the damping component is circular, and the diameter of the damping component is smaller than the minimum diameter of the closed end and larger than the diameter of the contact plane; in the compressed state, the damping component is compressed by the conical table and wraps the conical table, so that the damping component forms a contoured body matching the shape of the conical table.

[0010] Optionally, in the compressed state, the conical table extends into the closed end, and the center of the stepped position of the closed end falls into the conical table.

[0011] Optionally, the mounting cavity is formed between the closed end of the embedding hole and the conical table, and the distance between the closed end and the conical table gradually decreases from the center position of the mounting cavity to the edge direction.

[0012] Optionally, in the expanded state, the damping component comprises a first surface for contacting the inner wall of the embedding hole and a second surface for contacting the sleeve, and at least one of the first surface and the second surface is provided with a convex part.

[0013] Optionally, in the expanded state, the damping component comprises a first surface for contacting the inner wall of the embedding hole and a second surface for contacting the sleeve, and at least one of the first surface and the second surface is provided with a convex part.

[0014] Optionally, in the expanded state, the damping component comprises a first surface for contacting the inner wall of the embedding hole and a second surface for contacting the sleeve, and at least one of the first surface and the second surface is provided with a convex part.

[0015] Optionally, a connecting structure is arranged between the stator unit and the valve body, and the connecting structure comprises a connecting member and a locking member; the connecting member comprises a first connecting part connected with the stator unit and a second connecting part for connecting with the valve body; a first mounting hole is formed in the valve body; a second mounting hole is formed in the second connecting part and matched with the first mounting hole; and the locking member is connected with the first mounting hole after passing through the second mounting hole.

[0016] As described above, the electronic expansion valve has the following beneficial effects:

[0017] When assembling the electronic expansion valve, the damping component is placed to the end of the sleeve, and then the sleeve of the valve body is inserted into the embedding hole of the stator unit, so that the top end of the sleeve extrudes the damping component, the damping component is deformed, and the friction force between them is coordinated to limit the axial movement and radial movement of the valve body. Compared with arranging the O-shaped ring at the open end of the stator unit, the convenience of assembling the valve body and the stator unit is effectively increased, the assembly difficulty and assembly time between the two are effectively reduced, and the ring groove machining for installing the O-shaped ring is not needed.

[0018] In the scheme, the damping component not only plays a role in limiting the axial movement of the sleeve, but also effectively limits the radial movement of the sleeve due to the wrapping of the sleeve end after the deformation of the damping component. And because the damping component is extruded and deformed by the sleeve, the friction force between the inner wall of the embedding hole, the damping component and the sleeve is effectively increased, the relative movement of the valve body and the stator unit is hindered by the friction force, and the possibility of abnormal noise caused by the radial and axial impact of the sleeve on the inner wall of the embedding hole is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 It is a structural schematic view of the electronic expansion valve in an embodiment of the present application.

[0020] Fig. 2 It is a partial schematic view of the electronic expansion valve in another embodiment of the present application.

[0021] Fig. 3 It is a structural schematic view of the stator unit in an embodiment of the present application.

[0022] Fig. 4 It is a structural schematic view of the damping component in an embodiment of the present application. DETAILED DESCRIPTION

[0023] The reference signs in the drawings of the specification include:

[0024] Stator unit 1, embedding hole 110, open end 111, closed end 112, coil 120, coil holder 121, molded part 122,

[0025] Valve body 2, sleeve 201, conical platform 202, contact plane 2021,

[0026] Damping component 3, convex part 301,

[0027] Connecting piece 4, first connecting part 401, second connecting part 402,

[0028] Locking piece 5.

[0029] The following specific embodiments illustrate the embodiments of the present application, and those skilled in the art can easily understand other advantages and effects of the present application from the disclosure.

[0030] The utility model provides a kind of electronic expansion valve, as shown in Figs. 1 to 4

[0031] In an exemplary embodiment of the present application, an electronic expansion valve is provided, comprising:

[0032] The stator unit 1 is provided with an embedding hole 110 in the center along the axial direction, and the embedding hole 110 includes an open end 111 and a closed end 112.

[0033] The valve body 2 is provided with a sleeve 201, and the sleeve 201 extends into the embedding hole 110 to form an installation cavity between the closed end 112. A damping component 3 is arranged in the installation cavity, and the damping component 3 can be compressed by the sleeve 201 to form a resistance force that hinders the movement of the sleeve 201 relative to the stator unit 1.

[0034] For example, the stator unit 1 includes a molded part 122 and a coil assembly. The embedding hole 110 and a cavity are formed in the molded part 122. The embedding hole 110 includes an open end 111 and a closed end 112. The cavity is arranged around the embedding hole 110, and the coil assembly is arranged in the cavity.

[0035] For example, the molded part 122 is made of synthetic resin. The coil assembly includes a coil 120, a coil holder 121, and other components. The valve body 2 includes a mounting seat, a valve body, and a sleeve 201, a valve needle assembly, a rotor assembly, and other components arranged in sequence from the inside to the outside. The valve body is mounted on the mounting seat. One end of the valve needle assembly extends into the stator assembly, and the other end cooperates with the valve body to realize opening and closing actions.

[0036] It should be noted that when an O-ring is arranged between the open end 111 of the stator unit 1 and the sleeve 201, the O-ring itself will hinder the entry of the sleeve 201 into the embedding hole 110, causing difficulty in the entry of the sleeve 201. At the same time, the sleeve 201 will form a seal after entering the O-ring. During the process of the sleeve 201 entering the embedding hole 110, the air pressure in the embedding hole 110 increases, forming a resistance force that hinders the continued entry of the sleeve 201, causing difficulty in the installation of the sleeve 201. If the O-ring is arranged in the middle between the open end 111 and the closed end 112 in order to reduce the axial movement stroke of the sleeve 201 relative to the O-ring, a ring groove for installing the O-ring needs to be arranged on the inner wall of the embedding hole 110 between the open end 111 and the closed end 112. Compared with arranging the ring groove at the open end 111, the processing difficulty of the ring groove is increased. In addition, the arrangement of the ring groove and the O-ring also makes the electronic expansion valve larger and increases the demand for installation space.

[0037] ​When assembling the electronic expansion valve, the damping component 3 is placed at the end of the sleeve 201, and then the sleeve 201 of the valve body 2 is inserted into the embedding hole 110 of the stator unit 1, so that the top end of the sleeve 201 extrudes the damping component 3, the damping component 3 is deformed, and cooperates with the friction force between each other to limit the axial movement and radial movement of the valve body 2. Compared with arranging the O-ring at the open end 111 of the stator unit 1, the convenience of assembling the valve body 2 and the stator unit 1 is effectively increased, the assembly difficulty and assembly time-consuming between the two are effectively reduced, and the ring groove machining for installing the O-ring is not required.

[0038] In the embodiment, the damping component 3 not only plays a role in limiting the axial movement of the sleeve 201, but also effectively limits the radial movement of the sleeve 201 due to the deformation of the damping component 3 wrapping the end of the sleeve 201. And because the damping component 3 is extruded and deformed by the sleeve 201, the friction force between the inner wall of the embedding hole 110, the damping component 3 and the sleeve 201 is effectively increased, which hinders the relative movement of the valve body 2 and the stator unit 1 through the friction force, and reduces the possibility of abnormal noise caused by the radial and axial impact of the sleeve 201 on the inner wall of the embedding hole 110.

[0039] In an exemplary embodiment, the inner diameter of the closed end 112 is stepped down from the open end 111 to the closed end 112 of the embedding hole 110.

[0040] In the embodiment, the inner diameter of the closed end 112 of the embedding hole 110 is in the shape of a stepped cylinder, so that a unique mounting cavity is formed between the sleeve 201 and the embedding hole 110, and the damping component 3 has a larger mounting space.

[0041] It should be noted that the size of the mounting cavity is not fixed, but changes with the depth of the sleeve 201 inserted into the embedding hole 110.

[0042] For example, the inner diameter of the closed end 112 is stepped down in two stages.

[0043] In an exemplary embodiment, the end of the sleeve 201 in contact with the damping component 3 is provided with a conical platform 202, the end face of the conical platform 202 is a contact plane 2021 for contacting the damping component 3, and the diameter of the contact plane 2021 is smaller than the minimum diameter of the closed end 112.

[0044] In the embodiment, the conical platform 202 is arranged to facilitate the initial positioning of the sleeve 201 after it is inserted into the embedding hole 110. During the initial compression of the sleeve 201 against the damping component 3, the damping component 3 is subjected to a greater pressure at the middle part due to the smaller area of the contact surface 2021. During the subsequent compression of the sleeve 201 against the damping component 3, the damping component 3 is deformed towards the edge region of the mounting cavity due to the pressure at the middle part, so as to wrap around the conical platform 202 and facilitate the better positioning of the sleeve 201.

[0045] In an exemplary embodiment, the damping component 3 is an elastic member, which includes an expanded state and a compressed state. In the expanded state, the damping component 3 is circular and has a diameter smaller than the smallest diameter of the closed end 112 and larger than the diameter of the contact surface 2021. In the compressed state, the damping component 3 is compressed by the conical platform 202 and wraps around the conical platform 202, so as to form a profile body matching the shape of the conical platform 202.

[0046] In an exemplary embodiment, the damping component 3 is made of an elastic material to provide elastic buffering for the sleeve 201 and the embedding hole 110.

[0047] In an exemplary embodiment, in the expanded state, the damping component 3 is a circular sheet-shaped rubber member.

[0048] In an exemplary embodiment, the damping component 3 is made of EPDM rubber material.

[0049] In the embodiment, the damping component 3 on the sleeve 201 is in the expanded state before it contacts the inner wall of the embedding hole 110. When the damping component 3 on the sleeve 201 contacts the inner wall of the embedding hole 110, the damping component 3 starts to switch from the expanded state to the compressed state. In the compressed state, the damping component 3 is deformed under pressure and then wraps around the conical platform 202 to enhance the positioning of the sleeve 201.

[0050] In an exemplary embodiment, in the compressed state, the conical platform 202 extends into the closed end 112, and the center of the stepped position of the closed end 112 is located in the conical platform 202.

[0051] In an exemplary embodiment, the stepped position of the closed end 112 is circularly arc-shaped to facilitate the deformation of the damping component 3 towards the periphery of the mounting cavity, and the excess material is concentrated in the middle part under the influence of the curvature of the transition part, so as to better limit the position of the sleeve 201.

[0052] In an exemplary embodiment, the mounting cavity is formed between the closed end 112 of the embedding hole 110 and the conical platform 202, and the distance between the closed end 112 and the sleeve 201 gradually increases from the center position of the mounting cavity to the edge direction and then gradually decreases.

[0053] In the embodiment, the shape of the closed end 112 and the truncated cone 202 is limited, so that a unique shape mounting cavity is formed between them, so as to facilitate the deformation of the damping component 3 according to the limitation of the mounting cavity, and to limit the sleeve 201.

[0054] In an exemplary embodiment, in the relaxed state, the damping component 3 comprises a first surface for contacting the inner wall of the embedding hole 110 and a second surface for contacting the sleeve 201, and the first surface and the second surface are provided with protrusions 301.

[0055] In the embodiment, in order to increase the friction between the damping component 3, the embedding hole 110 and the sleeve 201, and to increase the resistance to relative movement between them, the first surface and the second surface of the damping component 3 can be provided with protrusions 301.

[0056] For example, in order to optimize the effect, the number of protrusions 301 can be set according to the needs.

[0057] For example, the protrusions 301 are sawtooth-shaped.

[0058] In an exemplary embodiment, in the relaxed state, the damping component 3 comprises a first surface for contacting the inner wall of the embedding hole 110 and a second surface for contacting the sleeve 201, and the first surface or the second surface is provided with an adhesive layer.

[0059] In the embodiment, the adhesive layer is provided on the second surface, which reduces the possibility of the damping component 3 falling after being placed on the sleeve 201. At the same time, the adhesive layer can effectively prevent the relative movement between the embedding hole 110, the damping component 3 and the sleeve 201.

[0060] For example, the adhesive layer can be provided on both the first surface and the second surface.

[0061] In an exemplary embodiment, in the relaxed state, the damping component 3 comprises a first surface for contacting the inner wall of the embedding hole 110 and a second surface for contacting the sleeve 201, and one of the first surface and the second surface is provided with an adhesive layer, and the other of the first surface and the second surface is provided with protrusions 301.

[0062] It should be noted that, in order to facilitate installation and facilitate deformation of the damping component 3, one side of the damping component 3 can be provided with an adhesive, and the other side can be in abutting contact with the inside of the embedding hole 110 or the sleeve 201, and the protrusions 301 at the abutting contact position can increase the friction.

[0063] In an exemplary embodiment, a connecting structure is arranged between the stator unit 1 and the valve body 2, the connecting structure comprising a connecting piece 4 and a locking piece 5, the connecting piece 4 comprising a first connecting portion 401 connected with the stator unit 1 and a second connecting portion 402 for connecting with the valve body 2, the valve body 2 being provided with a first mounting hole, the second connecting portion 402 being provided with a second mounting hole matched with the first mounting hole, the locking piece 5 being connected with the first mounting hole after passing through the second mounting hole.

[0064] It should be noted that, in order to make the relative position between the stator unit 1 and the valve body 2 more stable, a connecting structure is further arranged between the stator unit 1 and the valve body 2 to fix the stator unit 1 and the valve body 2.

[0065] When assembled, the sleeve 201 is inserted into the embedding hole 110 and presses the damping member 3 until the first mounting hole and the second mounting hole are aligned, and then the locking piece 5 is inserted and locked, thereby realizing the connection between the stator unit 1 and the valve body 2. The connecting structure, in combination with the arrangement of the damping member 3, also plays a role in facilitating installation. If there is no damping member 3, in order to better limit the axial movement of the sleeve 201, the top of the sleeve 201 will directly abut against the embedding hole 110. At this time, if the first mounting hole and the second mounting hole cannot be aligned due to processing reasons, it will lead to the failure of installing the locking piece 5. However, the arrangement of the damping member 3 can effectively compensate for the processing tolerance, facilitate the installation of the locking piece 5, and make the sleeve 201 and the embedding hole 110 flexibly contact through the damping member 3, thereby reducing the possibility of abnormal noise.

[0066] Exemplarily, the locking piece 5 is a bolt, and the locking piece 5 is threadedly matched with the first mounting hole to facilitate stable connection.

[0067] Exemplarily, the first mounting hole is arranged on the mounting seat, and the sleeve 201 is fixedly connected with the valve body.

[0068] In an exemplary embodiment of the present application, an assembling method of an electronic expansion valve is also provided, which is applied to the electronic expansion valve described above, and the method comprises the following steps:

[0069] In step S100, the damping member 3 is placed at the end of the sleeve 201.

[0070] In the present embodiment, the damping member 3 can be directly placed at the end of the sleeve 201 or be bonded at the end of the sleeve 201.

[0071] In step S110, the sleeve 201 is inserted into the embedding hole 110 and presses the damping member 3, so that the damping member 3 is deformed to adapt to the shape of the mounting cavity, and the compression of the damping member 3 is monitored until the sleeve 201 reaches the assembly position.

[0072] In the embodiment, the shock-absorbing component 3 wraps the end of the sleeve 201 after the deformation caused by the force, so as to limit the movement of the sleeve 201 in the embedding hole 110.

[0073] It is worth mentioning that the compression of the shock-absorbing component 3 includes the compression force and the compression range (the compression amount) and the like.

[0074] It is also worth mentioning that when the shock-absorbing component 3 is extruded by the sleeve 201, the compression force applied to the shock-absorbing component 3 needs to be monitored, and when the first mounting hole and the second mounting hole are aligned, that is, the compression range requirement is met, the sleeve 201 reaches the assembly position, at this time, the sleeve 201 stops entering the embedding hole 110.

[0075] In step S120, the stator unit 1 and the valve body 2 are fixed.

[0076] It is worth mentioning that the shock-absorbing component 3 can limit the upward and lateral movement of the sleeve 201 in the embedding hole 110, and the stator unit 1 and the valve body 2 are fixed, which can also limit the downward movement of the sleeve 201.

[0077] For example, the stator unit 1 and the valve body 2 are fixed through the above-mentioned connecting structure.

[0078] In the embodiment, the shock-absorbing component 3 limits the mutual impact between the sleeve 201 and the embedding hole 110, and at the same time, reduces the possibility of the sleeve 201 moving in the embedding hole 110. In addition, the shock-absorbing component 3 is arranged, so as to facilitate the positioning of the mounting hole when the stator unit 1 and the valve body 2 are fixed, and increase the assembly convenience.

[0079] The above-mentioned embodiments only exemplarily illustrate the principle and the effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and the scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and the technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. An electronic expansion valve characterized by, The application relates to a valve assembly comprising: a stator unit provided with an embedding hole in the center along the axial direction, the embedding hole comprising an open end and a closed end; a valve body provided with a sleeve, the sleeve extending into the embedding hole to form an installation cavity between the sleeve and the closed end, the installation cavity being provided with a damping component, the damping component being capable of being compressed by the sleeve to form a resistance force resisting the movement of the sleeve relative to the stator unit.

2. The electronic expansion valve according to claim 1, characterized in that The inner diameter of the closed end decreases stepwise from the open end to the closed end of the embedding hole.

3. The electronic expansion valve according to claim 2, wherein The end of the sleeve in contact with the damping component is provided with a conical platform, the end face of the conical platform being a contact plane for contacting the damping component, the diameter of the contact plane being smaller than the minimum diameter of the closed end.

4. The electronic expansion valve according to claim 3, characterized in that The damping component is an elastic member, the damping component comprising an expanded state and a compressed state, in the expanded state, the damping component is circular, the diameter of the damping component being smaller than the minimum diameter of the closed end and larger than the diameter of the contact plane; in the compressed state, the damping component is compressed by the conical platform to wrap the conical platform, so that the damping component forms a profile body matching the shape of the conical platform.

5. The electronic expansion valve according to claim 4, wherein In the compressed state, the conical platform extends into the closed end, and the center of the stepped position of the closed end falls into the conical platform.

6. The electronic expansion valve according to claim 5, wherein The installation cavity is formed between the closed end and the conical platform of the embedding hole, and the spacing between the closed end and the conical platform gradually decreases from the center position of the installation cavity to the edge direction.

7. The electronic expansion valve according to claim 4, wherein In the expanded state, the damping component comprises a first surface for contacting the inner wall of the embedding hole and a second surface for contacting the sleeve, and at least one of the first surface and the second surface is provided with a convex part.

8. The electronic expansion valve according to claim 4, wherein In the expanded state, the damping component comprises a first surface for contacting the inner wall of the embedding hole and a second surface for contacting the sleeve, and one of the first surface and the second surface is provided with an adhesive layer.

9. The electronic expansion valve according to claim 4, wherein In the expanded state, the damping component comprises a first surface for contacting the inner wall of the embedding hole and a second surface for contacting the sleeve, and one of the first surface and the second surface is provided with an adhesive layer, and the other of the first surface and the second surface is provided with a convex part.

10. The electronic expansion valve according to any one of claims 1 to 9, characterized in that A connecting structure is arranged between the stator unit and the valve body, the connecting structure comprising a connecting member and a locking member, the connecting member comprising a first connecting part connected with the stator unit and a second connecting part for connecting with the valve body, the valve body being provided with a first installation hole, the second connecting part being provided with a second installation hole matched with the first installation hole, and the locking member being connected with the first installation hole after penetrating through the second installation hole.

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