An electrically operated valve

Abstract

The application discloses an electric valve, which comprises a valve body component, a valve core component, a sealing component and a sealing seat component, the sealing seat component comprises a sealing seat, the sealing seat is fixedly connected with the valve body component, the sealing component is arranged between the inner wall of the sealing seat and the outer wall of the valve core component, the valve core component comprises a valve core, a bushing is arranged between the outer wall of the valve core and the inner wall of the sealing seat, the bushing is limitingly connected with the sealing seat component, the valve core can axially slide relative to the bushing, and the inner wall of the bushing comprises a lubricating part made of nonmetallic material, which can cooperate with the valve core. The application further discloses another electric valve with the structure, and the electric valve can improve the action reliability of the electric valve.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and in particular to an electric valve. Background Technology

[0002] Figure 1 The diagram shows a partial structural schematic of an electric valve. The electric valve includes a valve body 100, a guide sleeve 200 for a valve core disposed within and welded to the valve body 100, a valve core 300 made of metal, and a plastic nut 400. A sealing assembly 500 is provided between the valve core 300 and the guide sleeve 200. The portion of the valve core 300 located below the sealing assembly 500 slides in engagement with the guide sleeve 200. Under the influence of the nut 400, the valve core 300 can slide axially relative to the guide sleeve 200 to abut or separate from the sealing element 700. In this electric valve, the valve core 300, made of metal material, slides axially back and forth relative to the guide sleeve 200, made of metal material. The friction between the outer wall of the valve core 300 and the inner wall of the guide sleeve 200 is a hard-on-hard friction between two metal surfaces. The outer wall of the valve core 300 may be subjected to significant frictional wear, thereby increasing the gap between the valve core 300 and the guide sleeve 200. This poses a risk of axial misalignment of the valve core 300 relative to the guide sleeve 200, which may affect the reliability of the electric valve's operation. Summary of the Invention

[0003] The purpose of this application is to provide an electric valve that improves the reliability of electric valve operation.

[0004] This application provides an electric valve, including a valve body component, a valve core component, a sealing component, and a sealing seat component. The sealing seat component includes a sealing seat, which is fixedly connected to the valve body component. The sealing component is disposed between the inner wall of the sealing seat and the outer wall of the valve core component. The valve core component includes a valve core, and a bushing is disposed between the outer wall of the valve core and the inner wall of the sealing seat. The bushing is limitedly connected to the sealing seat component. The valve core can slide axially relative to the bushing. The inner wall of the bushing includes a lubrication part made of non-metallic material, which can cooperate with the valve core.

[0005] This application also provides another electric valve, including a valve body component, a valve core component, a sealing component, and a sealing seat component, characterized in that it further includes a bushing. The sealing seat component includes a sealing seat, which is fixedly connected to the valve body component. The sealing component is disposed between the inner wall of the sealing seat and the outer wall of the valve core component. The valve core component includes a valve core. The bushing is sleeved on the outside of the valve core and is limitedly connected to the valve core. The bushing can be driven by the valve core to slide axially relative to the sealing seat. The outer wall of the bushing includes a lubricating part made of non-metallic material, and a portion of the outer wall of the bushing is clearance-fitted with the inner wall of the sealing seat.

[0006] Compared with the prior art, the electric valve of the above solution can reduce the wear on the outer wall of the valve core, which is beneficial to improving the operational reliability of the electric valve. Attached Figure Description

[0007] Figure 1 The diagram shown is a partial structural schematic of an electric valve in the background art.

[0008] Figure 2 The diagram shown is a structural schematic of a specific embodiment of the electric valve of the present invention;

[0009] Figure 3A As shown Figure 2 A partial structural diagram showing the fit between the valve body, the dynamic sealing seat, and the bushing;

[0010] Figure 3B As shown Figure 3A A magnified view of a section at I1;

[0011] Figure 4A As shown Figure 1 A schematic diagram of a local structural deformation example of the fit between the valve body, the dynamic sealing seat component, and the bushing;

[0012] Figure 4B As shown Figure 4A A magnified view of a section at I2;

[0013] Figure 5 The diagram shown is a structural schematic of the bushing of the electric valve of the present invention, according to a first embodiment.

[0014] Figure 6 The diagram shown is a partial structural schematic of a specific embodiment two of the electric valve of the present invention;

[0015] Figure 7 The diagram shown is a structural schematic of a modified design for the third axial limiting part;

[0016] Figure 8 The diagram shown is a structural schematic of a modified example of the bushing.

[0017] Figure 9 The diagram shown is a structural schematic of a modified example of the bushing.

[0018] Figure 10 The diagram shown is a structural schematic of a modified example three of the bushing;

[0019] Figure 11 The diagram shown is a structural schematic of a modified example four of the bushing;

[0020] Figure 12 The diagram shown is a structural schematic of a modified example five of the bushing;

[0021] Figure 13 As shown Figure 2 A schematic diagram of another type of bushing;

[0022] Figure 14 As shown Figure 6 A schematic diagram of another type of bushing. Detailed Implementation

[0023] It should be noted that when directional terms such as "upper" and "lower" are used in this document, they are defined based on the positions shown in the accompanying drawings. It should be understood that the use of these directional terms is only for the clarity and convenience of describing the technical solution and should not limit the scope of protection.

[0024] To enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] The limiting connection in this article refers to a connection between two components that can be fixed or not, where one component can drive the other to move axially relative to the electric valve.

[0026] Figure 2 The diagram shown is a structural schematic of a specific embodiment of the electric valve of the present invention. Figure 3A The diagram shown in Figure 2 is a partial structural schematic of the valve body, dynamic sealing seat component, and bushing assembly. Figure 3B As shown Figure 3A A magnified view of a section at I1. Figure 4A As shown Figure 1 A schematic diagram of a modified local structure of the valve body, dynamic sealing seat components, and bushing assembly. Figure 4B As shown Figure 4A A magnified view of a section at I2. Figure 5 The diagram shown is a structural schematic of the bushing of the electric valve of the present invention, according to a first embodiment.

[0027] like Figure 2 and Figure 5As shown, the electric valve includes a valve body component 10, a valve core component 20, a sealing component 30, a sealing seat component 40, a nut 50, a drive rod 60 of the drive component, and a valve seat component 70. The valve body component 10 includes a valve body 11, on which a first connecting pipe A is connected. The sealing seat component 40 includes a sealing seat 41, which is welded and fixed to the valve body 11. The sealing component 30 is disposed between the inner wall of the sealing seat 41 and the outer wall of the valve core component 20, forming a dynamic seal between the sealing seat 41 and the valve core component 20. The valve seat component 70 includes a valve seat 71 and a sealing element 72 fixedly connected to the valve seat 71. The sealing element 72 can elastically deform under external force. The valve seat 71 is connected to a second connecting pipe B. The valve core component 20 includes a valve core 21. A bushing 80 is disposed between the outer wall of the valve core 21 and the inner wall of the sealing seat 41. The bushing 80 includes a lubricating part made of non-metallic material. The bushing 80 is limitedly connected to the sealing seat 41, and the outer wall of the valve core 21 and the inner wall of the bushing 80 are in a sliding fit with clearance. The bushing 80 is a straight cylindrical shape and is made of a self-lubricating plastic material, such as PTFE or PPS. The nut 50 moves axially in the electric valve under the transmission action of the transmission rod 60. The valve core 21 can slide axially relative to the bushing 80 under the drive of the nut 50 to abut or separate from the seal 72.

[0028] In this electric valve design, a bushing 80 is provided between the outer wall of the valve core 21 and the inner wall of the sealing seat 41. The bushing 80 includes a lubrication part made of non-metallic material. The bushing 80 is limitedly connected to the sealing seat 41, and the outer wall of the valve core 21 and the inner wall of the bushing 80 are in sliding fit with a clearance. Once the valve core 21 and the bushing 80 rub against each other, the contact surface between the two is no longer the friction between two metal surfaces as in the prior art. This can improve the wear on the valve core 21. Compared with the prior art, this also improves the skewness and warping of the valve core 21 caused by the increased clearance between the valve core 21 and the sealing seat 41 due to friction, making the valve core 21 slide smoothly and improving the operational reliability of the electric valve.

[0029] Because of the bushing 80, the wear between the valve core 21 and the bushing 80 is very small, and the radial clearance between them can be set to be smaller than the radial clearance between the first cylindrical part 411 of the sealing seat 41 and the valve core 21. This also helps the valve core 21 to tilt and lift relative to the electric valve in the axial direction, thus improving the reliability of the electric valve's operation.

[0030] The following describes a specific embodiment of the limiting connection between the bushing 80 and the sealing seat component 40.

[0031] like Figure 3A and Figure 3BAs shown, the sealing seat 41 is made of metal and includes a first cylindrical portion 411 and a second cylindrical portion 412 located below the first cylindrical portion 411. The inner diameter of the first cylindrical portion 411 is smaller than the inner diameter of the second cylindrical portion 412. Thus, a first step portion 413 is formed between the inner wall of the first cylindrical portion 411 and the inner wall of the second cylindrical portion 412. This step portion 413 serves as a first axial limiting portion, which allows the first axial limiting portion to be directly formed by the sealing seat 41, thereby reducing the number of parts and costs.

[0032] The sealing seat component 40 also includes a limiting member 42, which can be a generally annular gasket made of metal. The lower end of the sealing seat 41 includes a thin-walled portion 414 with a wall thickness less than that of the second cylindrical portion 412, thus forming a second stepped portion 415 between the second cylindrical portion 412 and the thin-walled portion 414 of the sealing seat 41. After the upper end face of the limiting member 42 abuts against the second stepped portion 415, the thin-walled portion 414 and the limiting member 42 are riveted together. The portion of the upper end face of the limiting member 42 that does not mate with the second stepped portion 415 includes a second axial limiting portion 416. The second axial limiting portion is convenient and easy to install. A bushing 80 is disposed between the second cylindrical portion 412 and the valve core 21, and the bushing 80 is axially limited between the first limiting portion 413 and the second axial limiting portion 416. The bushing 80 being confined between the first limiting part 413 and the second axial limiting part 416 means that the bushing 80 does not detach from the sealing seat 41, and if the bushing 80 slides axially relative to the sealing seat 41, the first limiting part 413 restricts the bushing 80 from continuing to slide upward relative to the sealing seat 41, and the second axial limiting part 416 restricts the bushing 80 from continuing to slide downward relative to the sealing seat 41.

[0033] Since the bushing 80 is made of a self-lubricating plastic material, after it is placed between the sealing seat 41 and the valve core 21, the bushing 80 may be compressed during the sliding process of the valve core 21. This can cause the gap between the valve core 21 and the bushing 80 to become too small or disappear, leading to the valve core 21 jamming. To prevent this jamming, a preset axial displacement is provided between the first axial limiting part 413 and the second axial limiting part 416, providing a deformation space for the bushing 80 during the axial deformation of the electric valve. In this embodiment, a preset axial displacement is provided between the first axial limiting part 413 and the second axial limiting part 416.

[0034] Define the diameter of the inner wall of the first cylindrical part 411 as D1, define the diameter of the inner wall of the bushing 80 as D2, and define the diameter of the outer wall of the straight cylindrical section 210 of the valve core 21 that can cooperate with the bushing 80 as D. Then D2-D≤D1-D, so as to increase the wear reduction effect of the bushing 80 on the valve core 21 during the axial sliding process of the valve core 21.

[0035] It should be noted that the bushing can also be as follows: Figure 13As shown. Figure 13 As shown Figure 2 A schematic diagram of another type of bushing. Figure 13 The M-line in the text is for illustrative purposes only and does not refer to a visible dividing line in the actual bushing. For example... Figure 13 As shown, bushing 80F includes a body portion 82F and a lubrication portion 81F. The body portion 82F is made of metal, and the lubrication portion 81F is made of lubricating material. The lubrication portion 81F is attached to the inner wall of the body portion 82F by means of plating or the like. The lubrication portion 81F reduces wear on the valve core 21 relative to the sealing seat 41 during axial sliding, thus improving the skewing and warping of the valve core 21 caused by increased clearance between the valve core 21 and the sealing seat 41 due to friction. This also improves the operational reliability of the electric valve.

[0036] The minimum radial clearance between the inner wall of the limiting member 42 and the outer wall of the valve core 21 is greater than the clearance X1 between the inner wall of the bushing 80 and the outer wall of the valve core 21, to prevent the inner wall of the limiting member 42 from scratching the outer wall of the valve core 21. Since the specific structure of the limiting member 42 is not limited, its shape can be an annular shape with equal inner and outer diameters. In this case, the minimum radial clearance refers to the single-sided clearance between the inner wall of the limiting member 42 and the outer wall of the valve core 21. When the limiting member 42 is not an annular shape as described above, the minimum radial clearance refers to the minimum clearance between the inner wall of the limiting member 42 and the outer wall of the valve core 21.

[0037] It should be noted here that the sealing seat component can also adopt the following... Figure 4A As shown in the middle structure, the connection between the sealing seat component 40A and the bushing 80 can also be as follows: Figure 4A and Figure 4B The design is as shown.

[0038] like Figure 4A and Figure 4BAs shown, the sealing seat component 40A includes a sealing seat 41A and a limiting member 42A. The sealing seat 41A is made of metal and includes a first cylindrical portion 411A and a second cylindrical portion 412A located below the first cylindrical portion 411A. The inner diameter of the first cylindrical portion 411A is smaller than the inner diameter of the second cylindrical portion 412A, thus forming a first stepped portion 413A between the inner wall of the first cylindrical portion 411A and the inner wall of the second cylindrical portion 412A. This stepped portion 413A serves as a first axial limiting portion. The limiting member 42A can be an annular gasket made of metal. The lower end of the sealing seat 41A includes a thin-walled portion 414A with a wall thickness smaller than that of the second cylindrical portion 412A. Thus, the second cylindrical portion 412A and the thin-walled portion 414A of the sealing seat 41A are connected. A second step portion 415A is formed between the two. After the upper end face of the limiting member 42A abuts against the second step portion 415A, the thin-walled portion 414A is welded and fixed to the limiting member 42A. The portion of the upper end face of the limiting member 42A that does not cooperate with the second step portion 415A includes a second axial limiting portion 416A. The second axial limiting portion 416A is convenient and easy to implement. The bushing 80 is limited between the first limiting portion 413A and the second axial limiting portion 416A. The bushing 80 being limited between the first limiting portion 413A and the second axial limiting portion 416A means that the bushing 80 does not detach from the sealing seat 41A, and if the bushing 80 slides axially relative to the sealing seat 41A, the first limiting portion 413A restricts the upward sliding of the bushing 80 relative to the sealing seat 41A, and the second axial limiting portion 416A restricts the downward sliding of the bushing 80 relative to the sealing seat 41A.

[0039] Since the bushing 80 is made of a self-lubricating plastic material, after it is placed between the sealing seat 41A and the valve core 21, the bushing 80 may be squeezed during the sliding process of the valve core 21. As a result, the gap between the valve core 21 and the bushing 80 may be too small or disappear, causing the valve core 21 to jam. In order to prevent this jamming phenomenon, there is a preset axial displacement of more than 0.5mm between the first axial limiting part 413A and the second axial limiting part 416A, providing a deformation space for the bushing 80.

[0040] Figure 6 The diagram shown is a partial structural schematic of a specific embodiment two of the electric valve of the present invention. In this embodiment, it is similar to... Figure 2 The structure and materials of the same parts in the embodiments shown are referenced. Figure 2 The markings and descriptions in the embodiments are only relevant to this embodiment. Figure 2 The differences in structure or connection relationships in the electric valve of the illustrated embodiment will be described in detail.

[0041] like Figure 6As shown, the bushing 80 is sleeved on the outside of the valve core 211, and the bushing 80 is limitedly connected to the valve core component 20. The sealing seat component 40B includes a sealing seat 41B. In the axial direction of the electric valve, the bushing 80 can be driven by the valve core 21 of the valve core component 20 to slide axially relative to the sealing seat 41B.

[0042] The sealing seat 41B includes a first cylindrical portion 411B and a second cylindrical portion 412B, and forms a first axial limiting portion 413B, as detailed in the foregoing embodiments. The valve core component 20 includes a third axial limiting portion. The structure of the third axial limiting portion is as follows: the valve core 21 includes a third cylindrical portion 211 and a fourth cylindrical portion 212, the outer diameter of the fourth cylindrical portion 212 is larger than the outer diameter of the third cylindrical portion 211, and the transition portion between the outer wall of the third cylindrical portion 211 and the outer wall of the fourth cylindrical portion 212 serves as the third axial limiting portion 213. The inner wall of the second cylindrical portion 412B of the sealing seat 41B is approximately of equal diameter, and at least a portion of the outer wall of the bushing 80 slides with a clearance fit against the inner wall of the second cylindrical portion 412B. When the valve core component 20 moves to its uppermost position, the outer wall of the bushing 80 is substantially in sliding fit with the inner wall of the second cylindrical portion 412B.

[0043] Figure 7 The diagram shows a structural schematic of a modified design for the third axial limiting part, whereby the third axial limiting part can also be designed as follows: Figure 7 The design is as follows: A retaining ring 22B is fitted over the valve core 21B and welded to it. A bushing 80 overlaps the retaining ring 22B, forming a third axial limiting portion 213B on the upper end face of the retaining ring 22B. The third axial limiting portion 213B prevents the bushing 80 from coming off the lower end of the valve core 22B.

[0044] Define the diameter of the inner wall of the first cylindrical part 411B as D1, the diameter of the inner wall of the bushing 80 as D2, and the diameter of the outer wall of the third cylindrical part 211 as D. Then D2-D≤D1-D, so that the bushing 80 increases the wear reduction effect on the valve core 21 or valve core 21B during the axial sliding process of the valve core.

[0045] Figure 14 As shown Figure 6 A schematic diagram of another type of bushing. It should be noted that when the bushing is as follows... Figure 6In its configuration, bushing 80G comprises a body portion 81G and a lubrication portion 82G. The body portion 81G is made of metal, and the lubrication portion 82G is made of a lubricating material. The lubrication portion 82G is attached to the outer wall of the body portion 81G through a plating or other means. The lubrication portion 82G reduces wear on the valve core relative to the sealing seat during axial sliding, thus mitigating the valve core's misalignment and warping caused by increased clearance between the valve core and the sealing seat due to friction. This also improves the operational reliability of the electric valve.

[0046] In various embodiments, when the bushing is made of a self-lubricating plastic material, it can also be... Figure 8 The modified design shown in -12. Figure 8 The diagram shown is a structural schematic of a modified example of the bushing. Figure 9 The diagram shown is a structural schematic of a modified example of the bushing. Figure 10 The diagram shown is a structural schematic of a modified example three of the bushing.

[0047] like Figure 8 to Figure 10 As shown, the outer wall of the bushing can be provided with recesses, and the number of recesses is unlimited. For example... Figure 8 As shown, the inner wall of the bushing 80A has four recessed grooves 81A spaced apart, and the four grooves 81A are rectangular grooves. Or as... Figure 9 As shown, the inner wall of the bushing 80B has four recessed grooves 81B spaced apart, and the inner wall surfaces of the four grooves 81B are arc-shaped. Or as... Figure 10 As shown, the inner wall of the bushing 80C is provided with four recesses 81C at intervals, and the inner wall surface of the four recesses 81C is semi-circular.

[0048] Figure 11 The diagram shown is a structural schematic of a fourth variation of the bushing. Figure 12 The diagram shown is a structural schematic of a fifth variation of the bushing. Figure 11 to 12 As shown, the upper end of the bushing has several notches, or the lower end of the bushing has several notches, or both the upper and lower ends of the bushing have several notches.

[0049] like Figure 11 As shown, four notches 82D are spaced apart at the upper end of the bushing 80D along its circumference, and these four notches 82D connect to the upper end face of the bushing 80D. Figure 12 As shown, four notches 82E are provided at intervals on the circumference of the bushing 80E, at the upper end and the lower end of the bushing 80E.

[0050] Figure 8 to Figure 12 The effect of designing grooves or notches in the bushing shown is to provide deformation space for the radial deformation of the bushing, preventing the valve core from getting stuck due to plastic deformation of the bushing.

[0051] The electric valve provided in this application has been illustrated above with examples. Specific examples have been used to explain the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An electric valve, comprising a valve body component, a valve core component, a sealing component, and a sealing seat component, characterized in that, The sealing seat component includes a sealing seat, which is fixedly connected to the valve body component. The sealing component is disposed between the inner wall of the sealing seat and the outer wall of the valve core component. The valve core component includes a valve core. A bushing is disposed between the outer wall of the valve core and the inner wall of the sealing seat. The bushing is generally cylindrical, and the outer wall of the valve core and the inner wall of the bushing are in sliding fit with a clearance. The bushing and the sealing component are spaced apart axially. The bushing is limitedly connected to the sealing seat component. The valve core can slide axially relative to the bushing. The inner wall of the bushing includes a lubrication part made of non-metallic material, which can cooperate with the valve core. The sealing seat component includes a first axial limiting part and a second axial limiting part. The bushing is located between the first axial limiting part and the second axial limiting part. The bushing is made of PTFE or PPS material. The bushing has a preset axial displacement between the first axial limiting part and the second axial limiting part. The inner or outer wall of the bushing has several recesses; or The upper end of the bushing has several notches, and / or the lower end of the bushing has several notches.

2. The electric valve according to claim 1, characterized in that, The bushing is made of a self-lubricating plastic material, and the inner wall of the bushing serves as the lubrication part; or, the bushing includes a body and a lubrication part made of a lubricating material, the body being made of a metallic material, and the lubrication part being attached to the inner wall of the body.

3. The electric valve according to claim 1 or 2, characterized in that, The sealing seat includes a first cylindrical portion and a second cylindrical portion. The inner diameter of the first cylindrical portion is smaller than the inner diameter of the second cylindrical portion. The bushing is disposed between the inner wall of the second cylindrical portion and the outer wall of the valve core. The inner wall of the first cylindrical portion and the inner wall of the second cylindrical portion include a first axial limiting portion. The diameter of the inner wall of the first cylindrical portion is defined as D1, the diameter of the inner wall of the bushing is defined as D2, and the diameter of the outer wall of the valve core is defined as D. Then, D2-D≤D1-D is satisfied.

4. The electric valve according to claim 1 or 2, characterized in that, The sealing seat is made of metal material, the valve core is made of metal material, and the sealing seat component also includes a limiting member. The limiting member is generally annular and includes a second axial limiting portion. The limiting member is riveted to the sealing seat or welded to the sealing seat. The inner diameter of the limiting member is larger than the inner diameter of the bushing.

5. The electric valve according to claim 1, characterized in that, There are two or more recesses, and the recesses are spaced apart.

6. The electric valve according to claim 1, characterized in that, The upper end of the bushing has two or more notches, which are spaced apart in the circumferential direction of the bushing, and / or the lower end of the bushing has two or more notches, which are spaced apart in the circumferential direction of the bushing.

7. An electric valve, comprising a valve body component, a valve core component, a sealing component, and a sealing seat component, characterized in that, It also includes a bushing, which is axially spaced from the sealing component. The bushing is generally cylindrical. The sealing seat component includes a sealing seat, which is fixedly connected to the valve body component. The sealing component is disposed between the inner wall of the sealing seat and the outer wall of the valve core component. The valve core component includes a valve core. The bushing is sleeved on the outside of the valve core and is limitedly connected to the valve core. The bushing can be driven by the valve core to slide axially relative to the sealing seat. The outer wall of the bushing includes a lubricating part made of non-metallic material. At least a portion of the outer wall of the bushing is clearance-fitted with the inner wall of the sealing seat. The sealing seat includes a first cylindrical portion and a second cylindrical portion. The inner diameter of the first cylindrical portion is smaller than the inner diameter of the second cylindrical portion. A first axial limiting portion is included between the inner wall of the first cylindrical portion and the inner wall of the second cylindrical portion. The valve core component includes a third axial limiting portion. The bushing is limited between the first axial limiting portion and the third axial limiting portion. The outer wall of the bushing is in clearance sliding fit with the inner wall of the second cylindrical portion. The inner or outer wall of the bushing has several recesses; or The upper end of the bushing has several notches, and / or the lower end of the bushing has several notches.

8. The electric valve according to claim 7, characterized in that, The bushing is made of a self-lubricating plastic material, and the inner wall of the bushing serves as the lubrication part; or, the bushing includes a body and a lubrication part made of a lubricating material, the body being made of a metallic material, and the lubrication part being attached to the outer wall of the body.

9. The electric valve according to claim 7, characterized in that, The valve core includes a third cylindrical portion and a fourth cylindrical portion, the outer diameter of the fourth cylindrical portion is larger than the outer diameter of the third cylindrical portion, the bushing is located between the second cylindrical portion and the third cylindrical portion, and the transition portion between the outer wall of the third cylindrical portion and the outer wall of the fourth cylindrical portion includes the third axial limiting portion.

10. The electric valve according to claim 7, characterized in that, The valve core component also includes a retaining ring, which is sleeved on the outside of the valve core and fixedly connected to the valve core. The retaining ring includes the third axial limiting part.

11. The electric valve according to claim 9, characterized in that, The bushing is made of PTFE or PPS material. The diameter of the inner wall of the first cylindrical part is defined as D1, the diameter of the inner wall of the bushing is defined as D2, and the diameter of the outer wall of the third cylindrical part is defined as D. Then, D2-D≤D1-D is satisfied.

12. The electric valve according to claim 11, characterized in that, There are two or more recesses, and the recesses are spaced apart.

13. The electric valve according to claim 11, characterized in that, The upper end of the bushing has two or more notches, which are spaced apart in the circumferential direction of the bushing, and / or the lower end of the bushing has two or more notches, which are spaced apart in the circumferential direction of the bushing.

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