Valve device

Abstract

The valve device comprises a valve seat, a rotor assembly, a sleeve, an end cover and a valve element assembly, at least part of the rotor assembly is located in the sleeve, one end of the sleeve is fixedly connected with the valve seat, the other end of the sleeve is fixedly connected with the end cover, and the rotor assembly can drive the valve element assembly to act; the rotor assembly comprises a magnetic part and a first connecting piece; the first connecting piece is in fixed or limited connection with the magnetic part, at least part of the first connecting piece is located at the first end part of the magnetic part, the maximum outer diameter of the first connecting piece is larger than that of the magnetic part, and the first connecting piece abuts against the sleeve and the end cover. According to the valve device, the stability of the rotor assembly in the working process can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration, in particular to a valve device. BACKGROUND

[0002] The electronic expansion valve drives the up-and-down reciprocating movement of the valve core through the circumferential and axial movement of the rotor assembly, so the stroke space related to the axial movement of the rotor assembly leads to the relatively large volume of the electronic expansion valve. In order to reduce the volume of the electronic expansion valve, the axial position of the rotor assembly can be limited, so that the rotor assembly only rotates circumferentially without axial movement. When the axial position of the rotor assembly is limited, how to improve the stability of the rotor assembly during operation becomes a technical problem that technicians in the field need to solve. SUMMARY

[0003] The purpose of the present application is to provide a valve device to improve the stability of the rotor assembly during operation.

[0004] To achieve the above purpose, the technical scheme adopted by the present application is as follows: the valve device comprises a valve seat, a rotor assembly, a sleeve, an end cover and a valve core assembly, at least part of the rotor assembly is located in the sleeve, one end of the sleeve is fixedly connected with the valve seat, the other end of the sleeve is fixedly connected with the end cover, and the rotor assembly can drive the valve core assembly to act; the rotor assembly comprises a magnetic part and a first connecting piece; the first connecting piece is fixedly or limitingly connected with the first end of the magnetic part, the maximum outer diameter of the first connecting piece is larger than the maximum outer diameter of the magnetic part, and the first connecting piece is in abutment with the sleeve and the end cover respectively.

[0005] The valve device provided by the present application realizes the axial position limitation of the rotor assembly by fixing or limitingly connecting the first connecting piece with the first end of the magnetic part, abutting the first connecting piece with the end cover, and abutting the rotor assembly with the valve seat, and at the same time, the first connecting piece is in abutment with the sleeve, the maximum outer diameter of the first connecting piece is larger than the maximum outer diameter of the magnetic part, and the first connecting piece and the sleeve slide and rub during the operation of the rotor assembly, which can ensure the coaxiality of the rotor assembly and the valve seat, improve the cooperation precision with the sleeve during rotation, and thus improve the stability of the rotor assembly during rotation.

[0006] This application also provides a valve device, including a valve seat, a rotor assembly, a sleeve assembly, and a valve core assembly. At least a portion of the rotor assembly is located within the sleeve assembly. The sleeve assembly is fixedly connected to the valve seat. The sleeve assembly and the valve seat axially limit the rotor assembly. The rotor assembly can drive the valve core assembly to move. The rotor assembly includes a magnetic part and a first connecting member. The first connecting member is fixedly or limitingly connected to a first end of the magnetic part. The maximum outer diameter of the first connecting member is greater than the maximum outer diameter of the magnetic part. The first connecting member can cooperate with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly.

[0007] The valve device provided in this application axially limits the rotor assembly through a sleeve assembly and a valve seat. The first connector is fixed or limited to the first end of the magnetic part. At the same time, the first connector cooperates with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly. The maximum outer diameter of the first connector is greater than the maximum outer diameter of the magnetic part. During the operation of the rotor assembly, the first connector slides and rubs against the sleeve assembly, which improves the fitting accuracy between the rotor assembly and the sleeve assembly during rotation, thereby ensuring the coaxiality of the rotor assembly and the valve seat, and improving the stability of the rotor assembly rotation process. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of a valve device provided in an embodiment of this application;

[0009] Figure 2 for Figure 1 A schematic diagram of the rotor assembly;

[0010] Figure 3 This is a schematic diagram of another embodiment of the rotor assembly;

[0011] Figure 4 This is a schematic diagram of another embodiment of the rotor assembly;

[0012] Figure 5 for Figure 4 A schematic diagram of the structure of the first connecting member;

[0013] Figure 6 for Figure 4 A schematic diagram of the structure of the second connecting member;

[0014] Figure 7 for Figure 1 Schematic diagram of the lead screw;

[0015] Figure 8 for Figure 7 Another structural diagram from another perspective;

[0016] Figure 9 for Figure 1 A three-dimensional structural diagram of the valve seat;

[0017] Figure 10 Structure diagram of an embodiment of the valve core provided in the present application;

[0018] Figure 11 Structure diagram of another embodiment of the valve core provided in the present application;

[0019] Figure 12 is Figure 1 Partial enlarged view of the area in the dashed box.

[0020] The reference signs in the drawings are explained as follows:

[0021] 1, sleeve; 10, end cap; 100, limiting groove;

[0022] 2, valve core assembly; 20, screw rod; 200, clamping groove; 21, valve core; 201 / 204, side wall; 202, axial opening; 203, radial opening; 210, protruding part; 240, upper end part;

[0023] 3, rotor assembly; 31, accommodating hole; 32, transmission hole; 33, magnetic part; 300, accommodating groove; 301, first connecting piece; 302, second connecting piece; 3001, first accommodating groove; 3002, second accommodating groove; 3011 / 3023, limiting surface; 310, annular flange; 320, annular protrusion;

[0024] 4, valve seat; 40, mounting hole; 400, groove part;

[0025] 50, rolling body; 501, first rolling body; 502, second rolling body;

[0026] 61, limiting part; 62, mounting part;

[0027] 71, radial part; 72, axial part. DETAILED DESCRIPTION

[0028] As known from the background art, the rotation stability of the rotor assembly of the existing electronic expansion valve needs to be improved.

[0029] In order to improve the rotation stability of the rotor assembly, the present application provides a valve device. The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0030] The valve device can be applied in a vehicle thermal management system or an air conditioning system, and in the vehicle thermal management system, the valve device is often used as a throttling element or a switching element. The valve device comprises a valve part and a stator part, the stator part is located at the outer periphery of at least part of the valve part, the stator part is fixedly or limitingly connected with the valve part, and the valve device is electrically and / or signal connected with the outside through the stator part.

[0031] Please refer to Figure 1 The valve device provided by the application comprises a valve seat 4, a rotor assembly 3, a sleeve 1, an end cover 10 and a valve core assembly 2, at least part of the rotor assembly 3 is located in the sleeve 1, one end of the sleeve 1 is fixedly connected with the valve seat 4, the other end of the sleeve 1 is fixedly connected with the end cover 10, the rotor assembly 3 abuts against the valve seat 4, and the rotor assembly 3 can drive the valve core assembly 2 to act; the rotor assembly 3 comprises a magnetic part 33 and a first connecting piece 301; the first connecting piece 301 is fixedly or limitingly connected with a first end of the magnetic part 33, the maximum outer diameter of the first connecting piece 301 is greater than the maximum outer diameter of the magnetic part 33, and the first connecting piece 301 abuts against the sleeve 1 and the end cover 10 respectively.

[0032] The first connecting piece 301 is fixedly or limitingly connected with the magnetic part 33, so that the magnetic part 33 and the first connecting piece 301 rotate as a whole, and in a specific implementation, in order to facilitate installation, the first connecting piece 301 and the magnetic part 33 are connected together in a manner of interference fit. The first connecting piece 301 can be made of metal, for example, steel or copper. Of course, in other embodiments, the fixing manner can also be welding, bonding, injection molding and the like.

[0033] It should be noted that the first end of the magnetic part refers to a region containing the upper end face of the magnetic part and extending downward along the axial direction of the magnetic part. The second end of the magnetic part refers to a region containing the lower end face of the magnetic part and extending upward along the axial direction of the magnetic part. The maximum outer diameter of the first connecting piece being greater than the maximum outer diameter of the magnetic part means that the projection of the first connecting piece on a cross section perpendicular to the axial direction of the valve device covers the projection of the magnetic part on the cross section perpendicular to the axial direction of the valve device.

[0034] It should be noted that the axial direction of the application refers to the A direction in Figure 1 , and the radial direction of the application refers to the R direction in Figure 1 .

[0035] It should be noted that due to machining precision and assembly error, the abutment of the application is not an absolute abutment, and the tolerance is allowed within a certain range, or it can be understood that when the first connecting piece abuts against the end cover during assembly, the allowed assembly tolerance between the rotor assembly and the valve seat is 0-0.2 mm. Here, the axial limitation of the rotor assembly is to limit the axial movement of the rotor assembly, and it is not absolutely immovable, and within the allowed tolerance range, the rotor assembly can move up and down within a small range.

[0036] By fixing or limiting the connection of the first connecting piece 301 with the first end of the magnetic part 33, the rotor assembly 3 abuts against the end cover 10 through the first connecting piece 301, and at the same time, the rotor assembly 3 abuts against the valve seat 4, and the axial limiting of the rotor assembly 3 is realized by the valve seat 4 and the end cover 10, and at the same time, the first connecting piece 301 abuts against the sleeve 1, the maximum outer diameter of the first connecting piece 301 is greater than the maximum outer diameter of the magnetic part 33, and the sliding friction between the first connecting piece 301 and the sleeve 1 is generated during the working process of the rotor assembly 3, which can ensure the coaxiality of the rotor assembly 3 and the valve seat 4 during rotation, improve the cooperation accuracy of the rotor assembly 3 and the sleeve 1 during rotation, and thus improve the stability of the rotor assembly 3 during rotation.

[0037] In order to further improve the stability of the rotor assembly during rotation, in a specific embodiment, the rotor assembly 3 can further include a second connecting piece 302, the second connecting piece 302 is fixed or limited to connect with the second end of the magnetic part 33, the maximum outer diameter of the second connecting piece 302 is greater than the maximum outer diameter of the magnetic part 33, and the second connecting piece 302 abuts against the sleeve 1 and the valve seat 4 respectively; in this way, the first connecting piece and the second connecting piece are arranged at the first end and the second end of the magnetic part in the axial direction, and at the same time, the second connecting piece abuts against the sleeve, and the sliding friction is formed between the second connecting piece and the sleeve, which improves the coaxiality of the rotor assembly and the sleeve during working, and thus further improves the stability of the rotor assembly during rotation.

[0038] Similarly, the magnetic part 33 is fixed or limited to connect with the second connecting piece 302, so that the magnetic part 33 and the second connecting piece 302 rotate as a whole, in order to facilitate installation, the second connecting piece 302 and the magnetic part 33 are connected together by interference fit, and the second connecting piece 302 can be made of metal material, for example, steel or copper. Of course, in other embodiments, the fixing mode can also be welding, bonding, injection molding, etc.

[0039] It should be noted that the second end of the magnetic part refers to a region containing the lower end face and extending upward along the axial direction of the magnetic part. The first end and the second end of the magnetic part are relative to the center of the magnetic part, that is, the upper part of the center cross section of the magnetic part can be regarded as the first end, and the lower part of the center cross section of the magnetic part can be regarded as the second end. The maximum outer diameter of the second connecting piece is greater than the maximum outer diameter of the magnetic part, which means that the projection of the second connecting piece on the cross section perpendicular to the axial direction of the valve device covers the projection of the magnetic part on the cross section perpendicular to the axial direction of the valve device.

[0040] The first connecting piece 301 abuts against the end cover 10, and the second connecting piece 302 abuts against the valve seat 4. The first connecting piece 301 and the second connecting piece 302 are respectively fixed or positionally connected to the first end and the second end of the magnetic part 33 in the axial direction, which can further improve the stability of the rotor during rotation. Meanwhile, as part of the rotor assembly, the first connecting piece 301 and the second connecting piece 302 simultaneously serve as the limiting components of the rotor assembly 3 to axially limit the rotor assembly to limit the axial movement of the rotor assembly, without the need to additionally increase the limiting components of the rotor assembly 3, thereby reducing the number of parts and facilitating the simplification of the structure of the valve device.

[0041] It should be noted that, due to machining precision and assembly error, the above abutment is not an absolute abutment, and within the allowable range of tolerance, or it can be understood that, when the first connecting piece abuts against the end cover during assembly, the allowable assembly tolerance between the second connecting piece and the valve seat is 0-0.2 mm. Here, the axial limiting of the rotor assembly to limit the axial movement of the rotor assembly is not absolute, and within the allowable range of tolerance, the rotor assembly can move up and down within a small range.

[0042] Specifically, the maximum outer diameter of the first connecting piece 301 is greater than the maximum outer diameter of the magnetic part 33, and the maximum outer diameter of the second connecting piece 302 is greater than the maximum outer diameter of the magnetic part 33, so as to avoid the contact between the magnetic part 33 and the sleeve 1. The first connecting piece 301 and the second connecting piece 302 respectively slide and rub against the sleeve 1 to form radial positioning of the rotor assembly 3, thereby improving the coaxiality of the rotor assembly 3 and the valve device.

[0043] Please refer to Figure 2 In a specific embodiment, the first connecting piece 301 includes a fixedly connected mounting portion 62 and a limiting portion 61. The limiting portion 61 abuts against the sleeve 1 and the valve seat 4, respectively. The mounting portion 62 is fixed to at least part of the inner wall of the first end of the magnetic part 33. By fixing the mounting portion to the inner wall of the magnetic part 33, the contact area with the sleeve 1 is not increased, and the radial dimension of the rotor assembly 3 is also reduced. Specifically, the mounting portion 62 can have a whole annular structure. The mounting portion 62 is sleeved on the magnetic part 33, and the outer annular surface of the mounting portion 62 cooperates with the inner annular surface of the magnetic part 33. The magnetic part 33 and the mounting portion 62 of the first connecting piece 301 can be in interference fit. In this way, the first connecting piece 301 and the magnetic part 33 are easier to assemble. Meanwhile, by increasing the contact area between the first connecting piece 301 and the magnetic part 33 through the mounting portion 62, the assembly firmness of the rotor assembly 3 can be improved, and the stability of the rotor assembly 3 during operation can be further ensured.

[0044] Similarly, in an embodiment, the second connecting member 30 comprises a fixedly connected axial portion 72 and a radial portion 71, the radial portion 71 abuts against the sleeve 1 and the end cover 10 respectively, and the axial portion 72 is fixed to at least part of the inner wall of the second end portion of the magnetic portion 33. By fixing the axial portion 72 to the inner wall of the magnetic portion 33, the contact area with the sleeve 1 is not increased, and the radial dimension of the rotor assembly 3 is reduced. Specifically, with continued reference to Figure 2 , the axial portion 72 can have a whole annular structure, the axial portion 72 is sleeved on the magnetic portion 33, and the outer annular surface of the axial portion 72 cooperates with part of the inner annular surface of the magnetic portion 33. The magnetic portion 33 and the axial portion 72 of the second connecting member 302 can be an interference fit, so that the second connecting member 302 is more easily assembled with the magnetic portion 33, and the contact area between the second connecting member 302 and the magnetic portion 33 is increased by the axial portion 72, which can improve the firmness of the assembly of the rotor assembly 3 and ensure the stability of the rotor assembly 3 during operation.

[0045] With continued reference to Figure 1 and Figure 2 , in an embodiment, the first connecting member 301 can have an annular flange 310 extending in a direction away from the mounting portion 62, and the wall thickness of the annular flange 310 is smaller than that of the limiting portion 61 along the radial direction of the valve device, and the annular flange 310 abuts against the end cover 10. It is easy to understand that the wall thickness of the annular flange 310 is smaller than that of the limiting portion 61 along the radial direction of the valve device, so that the contact area between the rotor assembly 3 and the end cover 10 can be reduced, and the frictional resistance between the rotor assembly 3 and the end cover 10 can be reduced. Similarly, the second connecting member 302 can have an annular protrusion 320 extending in a direction away from the axial portion 72, and the wall thickness of the annular protrusion 320 is smaller than that of the radial portion 71 along the radial direction of the valve device, and the annular protrusion 320 abuts against the valve seat 4, and the annular protrusion 320 contacts the valve seat 4 to reduce the contact area between the rotor assembly 3 and the valve seat 4 and reduce the frictional resistance between the rotor assembly 3 and the valve seat 4. It can be seen that by providing the annular flange 310 on the first connecting member 301 and the annular protrusion 320 on the second connecting member, the wear debris can be reduced, and the risk of jamming caused by the wear debris entering the inside of the valve device can be reduced.

[0046] In another embodiment, the valve device provided by the application comprises a valve seat 4, a rotor assembly 3, a sleeve assembly, and a valve core assembly 2, at least part of the rotor assembly 3 is located in the sleeve assembly, the sleeve assembly is fixedly connected with the valve seat 4, the sleeve assembly and the valve seat 4 axially limit the rotor assembly 3, and the rotor assembly 3 can drive the valve core assembly 2 to act; the rotor assembly 3 comprises a magnetic part 33 and a first connecting piece 301; the first connecting piece 301 is fixedly or limitingly connected with a first end of the magnetic part 33, the maximum outer diameter of the first connecting piece 301 is greater than the maximum outer diameter of the magnetic part 33, and the first connecting piece 301 cooperates with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly.

[0047] The first connecting piece 301 is fixedly or limitingly connected with the magnetic part 33, so that the magnetic part 33 and the first connecting piece 301 rotate as a whole. In a specific embodiment, in order to facilitate installation, the first connecting piece 301 and the magnetic part 33 are connected together by interference fit. The first connecting piece 301 can be made of metal, for example, steel or copper. Of course, in other embodiments, the fixing method can also be welding, bonding, injection molding, etc.

[0048] It should be noted that the first end of the magnetic part refers to a region including the upper end face of the magnetic part and extending downward along the axial direction of the magnetic part. The second end of the magnetic part refers to a region including the lower end face of the magnetic part and extending upward along the axial direction of the magnetic part. The maximum outer diameter of the first connecting piece is greater than the maximum outer diameter of the magnetic part, which means that the projection of the first connecting piece on a cross section perpendicular to the axial direction of the valve device covers the projection of the magnetic part on a cross section perpendicular to the axial direction of the valve device.

[0049] It should be noted that the axial direction of the application refers to the A direction in Figure 1 , and the radial direction of the application refers to the R direction in Figure 1 .

[0050] The sleeve assembly comprises a sleeve 1 and an end cover 10, and the sleeve 1 and the end cover 10 are integrally structured or fixedly connected. The sleeve assembly and the valve seat 4 axially limit the rotor assembly 3, that is, the end cover 10 of the sleeve assembly and the valve seat axially limit the rotor assembly. During rotation of the rotor assembly, the rotor assembly can abut and contact the valve seat or the end cover. It should be noted that due to machining precision and assembly error, the abutment of the application is not in the absolute sense, and it is within the allowable tolerance range, or it can be understood that when the first connecting piece abuts the end cover during assembly, the allowable assembly tolerance between the rotor assembly and the valve seat is 0-0.2 mm. Here, the axial limitation of the rotor assembly is to limit the axial movement of the rotor assembly, which is not absolutely immovable, and within the allowable tolerance range, the rotor assembly can move up and down within a small range.

[0051] The first connecting piece 301 is fixed or limitedly connected with the first end of the magnetic part 33, and the valve seat 4 and the end cover 10 are used to axially limit the rotor assembly 3. Meanwhile, the first connecting piece 301 is matched with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly. The maximum outer diameter of the first connecting piece 301 is greater than the maximum outer diameter of the magnetic part 33. During the working process of the rotor assembly 3, the first connecting piece 301 and the sleeve 1 generate sliding friction. During the rotation process, the coaxiality of the rotor assembly 3 and the valve seat 4 can be ensured, the matching precision of the rotor assembly 3 and the sleeve 1 during the rotation process is improved, and thus the stability of the rotor assembly 3 during the rotation process is improved.

[0052] In order to further improve the stability of the rotor assembly during the rotation process, in an embodiment, the rotor assembly 3 can further include a second connecting piece 302. The second connecting piece 302 is fixed or limitedly connected with the second end of the magnetic part 33. The maximum outer diameter of the second connecting piece 302 is greater than the maximum outer diameter of the magnetic part 33. The second connecting piece 302 is matched with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly. In this way, the first connecting piece and the second connecting piece are arranged at the first end and the second end of the magnetic part in the axial direction. Meanwhile, the second connecting piece is matched with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly. The second connecting piece and the sleeve form sliding friction, the coaxiality of the rotor assembly and the sleeve during the working process is improved, and thus the stability of the rotor assembly during the rotation process is further improved.

[0053] Similarly, the magnetic part 33 is fixed or limitedly connected with the second connecting piece 302, so that the magnetic part 33 and the second connecting piece 302 rotate as a whole. In order to facilitate installation, the second connecting piece 302 and the magnetic part 33 are connected together by interference fit. The second connecting piece 302 can be made of metal, for example, steel or copper. Of course, in other embodiments, the fixing mode can also be welding, bonding, injection molding, etc.

[0054] It should be noted that the second end of the magnetic part refers to a region containing the lower end face and extending upward along the axial direction of the magnetic part. The first end and the second end of the magnetic part are relative to the center of the magnetic part, that is, the upper part of the center cross section of the magnetic part can be regarded as the first end, and the lower part of the center cross section of the magnetic part can be regarded as the second end. The maximum outer diameter of the second connecting piece is greater than the maximum outer diameter of the magnetic part, which means that the projection of the second connecting piece on a cross section perpendicular to the axial direction of the valve device covers the projection of the magnetic part on the cross section perpendicular to the axial direction of the valve device.

[0055] In a specific embodiment, along the axial direction of the valve device, the first connecting piece is in contact with the top of the sleeve assembly, and the second connecting piece is in contact with the top of the valve seat. The first connecting piece 301 is in sliding abutment with the end cover 10, and the second connecting piece 302 is in sliding abutment with the valve seat 4. The first connecting piece 301 and the second connecting piece 302 are respectively fixed or positionally connected to the first end and the second end of the axial direction of the magnetic part 33, which can further improve the stability of the rotor during rotation. At the same time, as part of the rotor assembly, the first connecting piece 301 and the second connecting piece 302 simultaneously act as a pair of limiting components of the rotor assembly to axially limit the rotor assembly to limit the axial movement of the rotor assembly, without the need to additionally increase the limiting components of the rotor assembly 3, thereby reducing the number of parts and facilitating the simplification of the structure of the valve device.

[0056] It should be noted that due to machining precision and assembly error, the above abutment is not an absolute abutment, and within the allowable tolerance range, or it can be understood that when the first connecting piece is in abutment with the end cover during assembly, the allowable assembly tolerance between the second connecting piece and the valve seat is 0-0.2mm. Here, the axial limiting of the rotor assembly to limit the axial movement of the rotor assembly is not absolute, and within the allowable tolerance range, the rotor assembly can move up and down within a small range.

[0057] Specifically, the maximum outer diameter of the first connecting piece 301 is greater than the maximum outer diameter of the magnetic part 33, and the maximum outer diameter of the second connecting piece 302 is greater than the maximum outer diameter of the magnetic part 33, so as to avoid the magnetic part 33 from contacting the sleeve 1. The first connecting piece 301 and the second connecting piece 302 are respectively in sliding friction with the sleeve 1 to form radial positioning of the rotor assembly 3, thereby improving the coaxiality of the rotor assembly 3 and the valve device.

[0058] For reference Figure 2 In a specific embodiment, the first connecting piece 301 includes a fixedly connected mounting portion 62 and a limiting portion 61, the limiting portion 61 is respectively in abutment with the sleeve 1 and the valve seat 4, and the mounting portion 62 is fixed to at least part of the inner wall of the first end of the magnetic part 33. By fixing the mounting portion to the inner wall of the magnetic part 33, the contact area with the sleeve 1 is not increased, and the radial dimension of the rotor assembly 3 is also reduced. Specifically, the mounting portion 62 can have a whole annular structure, the mounting portion 62 is sleeved on the magnetic part 33, and the outer ring surface of the mounting portion 62 cooperates with the inner ring surface of the magnetic part 33. The magnetic part 33 and the mounting portion 62 of the first connecting piece 301 can be in interference fit, so that the first connecting piece 301 and the magnetic part 33 are more easily assembled. At the same time, by increasing the contact area between the first connecting piece 301 and the magnetic part 33 through the mounting portion 62, the assembly firmness of the rotor assembly 3 can be improved, and the stability of the rotor assembly 3 during operation can be further ensured.

[0059] Similarly, in an embodiment, the second connecting member 30 comprises a fixedly connected axial portion 72 and a radial portion 71, the radial portion 71 abuts against the sleeve 1 and the end cover 10 respectively, and the axial portion 72 is fixed to at least part of the inner wall of the second end portion of the magnetic portion 33. By fixing the axial portion 72 to the inner wall of the magnetic portion 33, the contact area with the sleeve 1 is not increased, and the radial dimension of the rotor assembly 3 is also reduced. Specifically, continuing to refer to Figure 2 , the axial portion 72 can be in an overall annular structure, the axial portion 72 is sleeved on the magnetic portion 33, and the outer annular surface of the axial portion 72 cooperates with part of the inner annular surface of the magnetic portion 33. The magnetic portion 33 and the axial portion 72 of the second connecting member 302 can be in an interference fit, so that the second connecting member 302 is more easily assembled with the magnetic portion 33, and the contact area between the second connecting member 302 and the magnetic portion 33 is increased by the axial portion 72, which can improve the firmness of the assembly of the rotor assembly 3 and ensure the stability of the rotor assembly 3 during operation.

[0060] Continuing to refer to Figure 1 and Figure 2 , in an embodiment, the first connecting member 301 can have an annular flange 310 extending in a direction away from the mounting portion 62, and the wall thickness of the annular flange 310 is smaller than that of the limiting portion 61 along the radial direction of the valve device, and the annular flange 310 is in contact with the end cover 10. It is easy to understand that the wall thickness of the annular flange 310 is smaller than that of the limiting portion 61 along the radial direction of the valve device, so that the contact area between the rotor assembly 3 and the end cover 10 can be reduced, and the frictional resistance between the rotor assembly 3 and the end cover 10 can be reduced. Similarly, the second connecting member 302 can have an annular protrusion 320 extending in a direction away from the axial portion 72, and the wall thickness of the annular protrusion 320 is smaller than that of the radial portion 71 along the radial direction of the valve device, and the annular protrusion 320 is in contact with the valve seat 4, so as to reduce the contact area between the rotor assembly 3 and the valve seat 4 and reduce the frictional resistance between the rotor assembly 3 and the valve seat 4. It can be seen that by providing the annular flange 310 on the first connecting member 301 and the annular protrusion 320 on the second connecting member, the wear debris can be reduced, and the risk of jamming caused by the wear debris entering the inside of the valve device can be reduced.

[0061] It should be noted that the annular flange refers to a flange in an overall closed annular structure, i.e., the annular flange is a hollow structure, and the cross-sectional shape of the annular flange can be circular, square, polygonal, or regular or irregular closed polygon. Similarly, the annular protrusion refers to a protrusion in an overall closed annular structure, i.e., the annular protrusion is a hollow structure, and the cross-sectional shape of the annular protrusion can be circular, square, polygonal, or regular or irregular closed polygon.

[0062] Specifically, please refer to Figure 1Reference Figures 5-6 The limiting surface 3011 of the first connecting piece 301 is in limiting abutment with the lower surface of the end cover 10. The limiting surface 3023 of the second connecting piece 302 is in limiting abutment with the upper end surface of the valve seat 4. Meanwhile, the limiting portion 61 of the first connecting piece 301 is in contact with the sleeve 1, and the radial portion 71 of the second connecting piece 302 is in contact with the sleeve 1, so that the rotor assembly 3 only rotates without moving up and down, and meanwhile the coaxiality of the rotor assembly during rotation with the valve seat can be ensured.

[0063] In a specific embodiment, the material of the second connecting piece 302 can be the same as that of the valve seat 4, such as steel. Since the valve seat 4 and the second connecting piece 302 are made of the same material and have the same thermal expansion coefficient, the phenomenon of the second connecting piece 302 being stuck due to thermal expansion when rotating and contacting the valve seat 4 can be avoided. Of course, in other embodiments, the material of the second connecting piece is not limited, as long as the limiting function of the second connecting piece can be achieved.

[0064] Reference Figure 3 In a specific embodiment, in order to reduce the frictional resistance between the rotor assembly 3 and the sleeve 1, at least one of the first connecting piece 301 and the second connecting piece 302 has a protruding portion 36, the protruding portion 36 is arranged at intervals along the circumference of the first connecting piece 301, and the protruding portion 36 abuts against the sleeve 1. In a specific embodiment, the protruding portion 36 is in a semispherical shape, so as to further reduce the contact area between the protruding portion 36 and the sleeve 1, and to reduce wear. Of course, in other embodiments, the shape of the protruding portion is not limited. The number of protruding portions is not limited, and in order to ensure the stability of the rotor assembly during rotation, the protruding portions can be uniformly arranged at intervals along the circumferential direction.

[0065] Reference Figure 4 In a specific embodiment, in order to further reduce the frictional resistance between the rotor assembly 3 and the sleeve 1, at least one of the first connecting piece 301 and the second connecting piece 302 can be provided with a receiving groove 300, the opening direction of the receiving groove 300 is towards the inner wall of the sleeve 1, the rotor assembly 3 comprises a rolling body 50, the rolling body 50 is located in the receiving groove 300, and the rolling body 50 has a circular arc surface which protrudes from the receiving groove 300 and abuts against the sleeve 1.

[0066] It should be noted that when the first connecting piece 301 is provided with the receiving groove 300 and the rolling body, the rolling body is regarded as a component part of the first connecting piece 301. Similarly, when the second connecting piece 302 is provided with the receiving groove 300 and the rolling body, the rolling body is regarded as a component part of the second connecting piece 302.

[0067] The shape of the groove wall of the accommodating groove 300 matches the shape of the outer surface of the rolling body 50, the rolling body is accommodated in the accommodating groove 300 and can rotate relative to the accommodating groove 300. In an embodiment, the shape of the rolling body 50 is spherical, and the rolling body 50 can be a ball. The shape of the accommodating groove 300 matches the shape of the ball, and during the operation of the rotor assembly 3, the ball can rotate relative to the accommodating groove 300 and the inner wall of the sleeve 1, so as to convert the sliding friction between the rotor assembly and the sleeve into rolling friction, thereby reducing the wear of the rotor assembly and the amount of debris, and reducing the risk of the valve device being stuck due to the debris entering the inside of the valve device during operation. Of course, in other embodiments, the shape of the rolling body can also be a cylindrical body with a circular arc surface, and the shape of the rolling body is not limited as long as the matching surface of the rolling body at the matching position with the inner wall of the sleeve is a circular arc surface.

[0068] In an embodiment, the number of rolling bodies 50 is at least two, each rolling body 50 is symmetric about the center of the rotor assembly 3, and the number of accommodating grooves 300 is equal to the number of rolling bodies 50. In this way, the coaxiality of the rotor assembly 3 and the valve device during rotation of the rotor assembly 3 can be ensured, and the risk of being stuck can be reduced.

[0069] In order to further reduce the frictional resistance between the rotor assembly 3 and the sleeve 1, the first connecting member 301 and the second connecting member 302 can each be provided with an accommodating groove 300. Specifically, as shown in Figures 4-6 The accommodating groove 300 includes a first accommodating groove 3001 and a second accommodating groove 3002, the first accommodating groove 3001 is provided in the first connecting member 301, a first rolling body 501 is arranged in the first accommodating groove 3001, and the first rolling body 501 is in contact with the inner wall of the sleeve 1; the second accommodating groove 3002 is provided in the second connecting member 302, a second rolling body 502 is arranged in the second accommodating groove 3002, and the second rolling body 502 is in contact with the inner wall of the sleeve 1. Of course, in other embodiments, the accommodating groove can also be provided only in one of the first connecting member or the second connecting member.

[0070] In order to facilitate processing, the shape of the first rolling body 501 can be spherical, and the shape of the second rolling body 502 is substantially the same as that of the first rolling body 501, so as to reduce the frictional resistance between the second rolling body 502 and the inner wall of the sleeve 1 to the greatest extent. Of course, in other embodiments, the shapes of the first rolling body and the second rolling body can also be different. For example, the first rolling body is spherical, and the second rolling body is a cylindrical body with a circular arc end surface.

[0071] Specifically, as shown in Figure 4As shown, the outer wall of the first connecting piece 301 and the second connecting piece 302 are provided with four accommodating grooves, and the ball is placed in the accommodating grooves. The outer wall of the ball is in rolling contact with the inner wall of the sleeve. When the rotor assembly 3 rotates, the rolling structure reduces the friction between the rotor assembly 3 and the sleeve 1, reduces the wear of the parts, and avoids the waste generated by material wear from entering the valve body to cause jamming.

[0072] As can be seen, the outer wall of the first connecting piece 301 and the outer wall of the second connecting piece 302 are in abutment with the inner wall of the sleeve 1, the upper end of the first connecting piece 301 is in abutment with the end cover 10, and the lower end of the second connecting piece 302 is in abutment with the valve seat 4, forming a limiting structure of the rotor component, ensuring that the rotor only rotates circumferentially during operation without axial movement. At the same time, the abutment of the first connecting piece and the second connecting piece with the sleeve 1 ensures the coaxiality of the rotor assembly 3 and the sleeve 1 during operation. Further, the circular arc surface of the rolling body cooperates with the inner wall of the sleeve to convert the sliding friction between the rotor assembly and the inner wall of the sleeve into rolling friction, further reducing friction, thereby reducing the risk of jamming of the valve device during operation while miniaturizing the structure.

[0073] With reference to Figure 1 and Figure 2 In a specific embodiment, the first connecting piece 301 is provided with a receiving hole 31, the hole diameter of the receiving hole 31 is greater than or equal to the diameter of the upper end of the valve core assembly 2, and the valve core assembly 2 is adapted to move up and down along the receiving hole 31. In this way, the movement stroke of the valve core assembly 2 can be increased while reducing the volume of the valve device. In addition, the hole diameter of the receiving hole 31 can be greater than the cross-sectional dimension of the valve core assembly 2, which is beneficial to reduce the weight and cost of the first connecting piece 301.

[0074] The second connecting piece 302 is provided with a transmission hole 32, and the valve core assembly 2 is installed in the transmission hole 32. The transmission hole 32 can be a threaded hole, and the second connecting piece 302 is threadedly connected with the valve core assembly 2. Further, a trapezoidal thread structure is adopted, which increases the thread lifting force, while the structure is simple, reducing the high precision requirement of the valve core 21 assembly and the manufacturing cost.

[0075] With reference to Figure 1 In a specific embodiment, the inner end of the end cover 10 is provided with a limiting groove 100, and when the valve core assembly 2 moves axially to the highest point, the valve core assembly 2 can contact the bottom wall of the limiting groove 100. In this way, the wall thickness of the end cover 10 is increased to increase the movement stroke of the screw rod 20, which is beneficial to further reduce the volume of the valve device.

[0076] With reference to Figures 7-9In one embodiment, the valve seat 4 is provided with a mounting hole 40, and the wall forming at least part of the mounting hole 40 is non-circular in axial cross-section. The valve core assembly 2 is rotationally limited by the mounting hole 40, so that the rotational movement of the rotor assembly 3 is converted into linear movement of the valve core assembly 2.

[0077] Specifically, the valve seat 4 is provided with a recessed portion 400, and the lower end of the screw rod 20 is provided with a protruding portion 210 (shown in Figure 8 The protruding portion 210 and the recessed portion 400 cooperate to form an anti-rotation structure. When the rotor assembly 3 rotates the screw rod 20, the screw rod 20 moves up and down along the recessed portion 400 due to the anti-rotation structure between the screw rod 20 and the valve seat 4. The screw rod 20 is movably connected to the valve core 21, and the screw rod 20 drives the valve core 21 to move axially up and down. The axial movement of the valve core 21 reduces the assembly precision requirement of the valve device as a whole.

[0078] In order to ensure that the screw rod 20 can move up and down freely and smoothly, in one embodiment, the depth of the recessed portion 400 can be greater than the protruding height of the protruding portion 210. In other embodiments, the shape of the recessed portion and the protruding portion is matched. Further, in order to reduce the frictional force during the axial movement of the screw rod 20 along the valve seat 4, the axial thickness of the protruding portion 210 can be less than the axial thickness of the lower end of the screw rod 20.

[0079] In one embodiment, the valve core assembly 2 includes a movably connected screw rod 20 and a valve core 21. The screw rod 20 is drivingly connected or threadedly connected to the rotor assembly 3. The lower end of the screw rod 20 is provided with a clamping recess 200, and the upper end of the valve core 21 is clamped in the clamping recess 200. The depth of the clamping recess 200 is greater than the height of the upper end 240 of the valve core 21.

[0080] Specifically, the clamping recess 200 can include an axial opening 202 and a radial opening 203. During assembly, the valve core 21 is placed into the screw rod 20 along the radial opening 203, and the lower surface of the upper end 240 of the valve core 21 is clamped to the side wall 201 of the clamping recess 200.

[0081] In order to improve the coaxiality of the screw rod 20 and the valve seat during the axial movement of the screw rod 20 and reduce the risk of jamming, the peripheral surface of the upper end 240 can be gap-fitted with the side wall 204 of the clamping recess 200. Of course, in other embodiments, as long as the screw rod can be clamped in the clamping recess, it is acceptable.

[0082] As shown in Figure 10 In one embodiment, the upper end of the valve core 21 is formed by providing an annular recess below the upper end 240 of the valve core 21. In another embodiment, the shape of the recess is not limited, as long as the valve core 21 can be movably connected to the clamping recess, such as Figure 11As shown, a groove can also be formed in the upper end of the spool 21.

[0083] With reference to the foregoing Figure 1 , the rotor assembly 3 is threadedly connected with the screw rod 20, and the screw rod 20 is fixedly connected with the spool 21. Under the magnetic field excitation of the coil stator assembly, the rotor assembly 3 rotates to drive the screw rod 20 to move up and down. The anti-rotation structure on the screw rod 20 cooperates with the groove portion of the inner wall of the valve seat 4 to limit the rotational movement of the screw rod 20, so that the screw rod 20 can only drive the spool 21 to move up and down along the axis, and further the screw rod 20 drives the spool 21 to move up and down to realize the opening and closing of the valve port. The nested structure of the spool 21 and the screw rod 20 reduces the risk of falling after cooperation, and the simple structure reduces the high-precision requirement of the spool 21 assembly and the manufacturing cost.

[0084] In a specific embodiment, the material of the valve seat 4 is aluminum alloy, and the material of the spool 21 is steel. In this way, when the spool moves axially to close the valve port, the relatively soft valve seat can achieve the "wrapping" effect on the relatively hard spool, reducing the amount of spool wear.

[0085] The sleeve 1 is fixedly connected with the end cover 10, and the fixing manner can be welding. When the valve is closed, the screw rod 20 contacts the inner bottom surface of the valve seat 4 to achieve lower stop. There is a gap allowance S (shown in Figure 12 ) between the nested inner wall of the screw rod 20 and the upper end surface of the spool 21. The range of the gap allowance S is 0.1mm-0.3mm, such as 0.2mm gap. When the bottom of the spool 21 contacts the valve port, the screw rod 20 contacts the inner wall of the valve seat 4 to stop, and the 0.2mm gap reserved between the spool 21 and the screw rod 20. The screw rod 20 continues to move downward to compress the spring until the screw rod contacts the end surface of the spool 21, and the remaining gap is used to achieve over-close, thereby improving the sealing performance of the valve device. The setting of the gap allowance can reduce the situation of being stuck when the valve is closed, and can reduce the impact damage of the spool 21 to the valve port when the valve is closed. When the valve is opened, the spool 21 moves upward and contacts the end cover 10 to achieve upper stop. As can be seen, the stop of the spool 21 is realized by using the existing component structure, and the stop structure of the spool 21 is simple.

[0086] It should be noted that the above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications can be made, which are all within the protection scope of the present application.

Claims

1. A valve device, characterized in that, The assembly includes a valve seat (4), a rotor assembly (3), a sleeve (1), an end cap (10), and a valve core assembly (2). At least part of the rotor assembly (3) is located inside the sleeve (1). One end of the sleeve (1) is fixedly connected to the valve seat (4), and the other end of the sleeve (1) is fixedly connected to the end cap (10). The rotor assembly (3) abuts against the valve seat (4), and the rotor assembly (3) can drive the valve core assembly (2) to move. The rotor assembly (3) includes a magnetic part (33) and a first connecting member (301). The first connecting member (301) is fixedly or limitedly connected to the first end of the magnetic part (33). The maximum outer diameter of the first connecting member (301) is greater than the maximum outer diameter of the magnetic part (33). The first connecting member (301) abuts against the sleeve (1) and the end cap (10) respectively.

2. The valve device as claimed in claim 1, characterized in that, The rotor assembly (3) further includes a second connector (302), which is fixed or limited to the second end of the magnetic part (33). The maximum outer diameter of the second connector (302) is greater than the maximum outer diameter of the magnetic part (33). The second connector (302) abuts against the sleeve (1) and the valve seat (4) respectively.

3. The valve device as described in claim 1 or 2, characterized in that, The first connector (301) includes a mounting part (62) and a limiting part (61) that are fixedly connected. The limiting part (61) abuts against the sleeve (1) and the valve seat (4) respectively. The mounting part (62) is fixed to at least a portion of the inner wall of the first end of the magnetic part (33).

4. The valve device as claimed in claim 2, characterized in that, The second connector (302) includes an axial portion (72) and a radial portion (71) that are fixedly connected. The radial portion (71) abuts against the sleeve (1) and the end cap (10) respectively. The axial portion (72) is fixed to at least a portion of the inner wall of the second end of the magnet (33).

5. The valve device as claimed in claim 2, characterized in that, The first connector (301) has an annular flange (310) extending in a direction away from the mounting portion (62) and radially along the valve device. The wall thickness of the annular flange (310) is less than the wall thickness of the limiting portion (61), and the annular flange (310) abuts against the end cap (10). The second connector (302) has an annular protrusion (320) extending in a direction away from the axial portion (72) and radially along the valve device. The wall thickness of the annular protrusion (320) is less than the wall thickness of the radial portion (71), and the annular protrusion (320) abuts against the valve seat (4).

6. The valve device as claimed in claim 2, characterized in that, At least one of the first connector (301) and the second connector (302) has a protrusion (36) that is spaced apart circumferentially along the first connector (301) and abuts against the sleeve (1).

7. The valve device as claimed in claim 2, characterized in that, At least one of the first connector (301) and the second connector (302) is provided with a receiving groove (300), the opening direction of the receiving groove (300) is facing the inner wall of the sleeve (1), the rotor assembly (3) includes a rolling element (50), the rolling element (50) is located in the receiving groove (300), the rolling element (50) has an arc surface, the arc surface protrudes from the receiving groove (300) and abuts against the sleeve (1).

8. The valve device as claimed in claim 1 or 2, characterized in that, The first connector (301) has a receiving hole (31) with a diameter greater than or equal to the diameter of the upper end of the valve core assembly (2). The inner end of the end cap (10) has a limiting groove (100). When the valve core assembly (2) moves upward to the highest point, the valve core assembly (2) can contact the bottom wall of the limiting groove (100).

9. The valve device as claimed in claim 2, characterized in that, The second connector (302) has a transmission hole (32), a portion of the valve core assembly (2) is located in the transmission hole (32), the transmission hole (32) is a threaded hole, and the second connector (302) is threadedly connected to the valve core assembly (2).

10. A valve device, characterized in that, Includes a valve seat (4), a rotor assembly (3), a sleeve assembly and a valve core assembly (2), at least part of the rotor assembly (3) is located inside the sleeve assembly, the sleeve assembly is fixedly connected to the valve seat (4), the sleeve assembly and the valve seat (4) axially limit the rotor assembly (3), and the rotor assembly (3) can drive the valve core assembly (2) to move; The rotor assembly (3) includes a magnetic part (33) and a first connector (301); the first connector (301) is fixedly or limitedly connected to the first end of the magnetic part (33), the maximum outer diameter of the first connector (301) is greater than the maximum outer diameter of the magnetic part (33), and the first connector (301) cooperates with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly.

11. The valve device as claimed in claim 10, characterized in that, The rotor assembly (3) further includes a second connector (302), which is fixed or limited to the second end of the magnetic part (33). The maximum outer diameter of the second connector (302) is greater than the maximum outer diameter of the magnetic part (33). The second connector (302) cooperates with the inner wall of the sleeve assembly and can rotate relative to the sleeve assembly.

12. The valve device as claimed in claim 11, characterized in that, At least one of the first connector (301) and the second connector (302) has a protrusion (36) that is spaced apart circumferentially along the first connector (301), and the protrusion (36) engages with the inner wall of the sleeve assembly and is rotatable relative to the sleeve assembly.

13. The valve device as claimed in claim 11, characterized in that, At least one of the first connector (301) and the second connector (302) is provided with a receiving groove (300), the opening direction of the receiving groove (300) is facing the inner wall of the sleeve (1), the rotor assembly (3) includes a rolling element (50), the rolling element (50) is located in the receiving groove (300), the rolling element (50) has an arc surface, the arc surface protrudes from the receiving groove (300) and abuts against the sleeve (1).

14. The valve device according to any one of claims 10-13, characterized in that, The first connector (301) includes a mounting part (62) and a limiting part (61). The limiting part (61) cooperates with the inner wall of the sleeve assembly, and the mounting part (62) is fixed to at least a portion of the inner wall of the first end of the magnetic part (33).

15. The valve device according to any one of claims 11-13, characterized in that, The second connector (302) includes an axial portion (72) and a radial portion (71), the radial portion (71) engaging with the inner wall of the sleeve assembly, and the axial portion (72) being fixed to at least a portion of the inner wall of the second end of the magnetic part (33).

16. The valve device according to any one of claims 11-13, characterized in that, The first connector (301) has an annular flange (310) extending in a direction away from the mounting portion (62) and radially along the valve device. The wall thickness of the annular flange (310) is less than the wall thickness of the limiting portion (61), and the annular flange (310) contacts the end cap (10). The second connector (302) has an annular protrusion (320) extending in a direction away from the axial portion (72) and radially along the valve device. The wall thickness of the annular protrusion (320) is less than the wall thickness of the radial portion (71), and the annular protrusion (320) contacts the valve seat (4).

17. The valve device according to any one of claims 10-13, characterized in that, The first connector (301) has a receiving hole (31) with a diameter greater than or equal to the diameter of the upper end of the valve core assembly (2). The sleeve assembly includes a sleeve (1) and an end cap (10). The sleeve and the end cap are integrally structured or fixedly connected. The inner end of the end cap (10) has a limiting groove (100). When the valve core assembly (2) moves upward to the highest point, the valve core assembly (2) can contact the bottom wall of the limiting groove (100).

18. The valve device according to any one of claims 11-13, characterized in that, The second connector (302) has a transmission hole (32), a portion of the valve core assembly (2) is located in the transmission hole (32), the transmission hole (32) is a threaded hole, and the second connector (302) is connected to the valve core assembly (2) in a transmission connection.

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