Electric valve

Abstract

The invention discloses an electrically operated valve, which comprises a valve core component and a sealing seat component, and is characterized in that the sealing seat component comprises a sealing seat, the sealing seat comprises a first cylinder part and a second cylinder part, the inner diameter of the first cylinder part is smaller than that of the second cylinder part, the valve core component comprises a valve core, and the valve core is arranged in the sealing seat. A bush is arranged between the outer wall of the valve element and the inner wall of the second cylinder part, the inner wall of the bush comprises a lubricating part made of a non-metal material, and the valve element can axially slide relative to the bush; the sealing seat component comprises a first axial limiting part and a second axial limiting part, and the bush is limited between the first axial limiting part and the second axial limiting part. According to the electric valve, the valve closing reliability of the electric valve can be improved.

Description

[0001] This application is a divisional application based on the original invention patent application number 202010523954.6, the application date is June 10, 2020, and the application name is "An Electric Valve". Technical Field

[0002] The present invention relates to the technical field of fluid control, in particular to an electric valve. Background Art

[0003] Figure 1 The figure shows a partial structural schematic diagram of an electric valve of the background technology. The electric valve comprises a valve body 100, a guide sleeve 200 of a valve core arranged in the valve body 100 and welded and fixed to the valve body 100, a valve core 300 made of metal material, and a plastic nut 400. A sealing assembly 500 is arranged between the valve core 300 and the guide sleeve 200. The portion of the valve core 300 located at the lower side of the sealing assembly 500 is slidably matched with the guide sleeve 200. The valve core 300 can slide axially relative to the guide sleeve 200 under the drive of the nut 400 to abut or separate from the seal 700. In the electric valve, the valve core 300 will be skewed under the action of fluid pressure. Since the valve core 300 and the guide sleeve 200 are both made of metal materials, if the gap between the two is too small, the valve core 300 may be stuck. If the gap is too large, the skewness of the valve core 300 is large, which affects the valve closing reliability of the electric valve. Therefore, there is room for improvement in its valve closing reliability. Summary of the invention

[0004] The purpose of the present application is to provide an electric valve to improve the closing reliability of the electric valve.

[0005] The present application provides an electric valve, an electric valve, comprising a valve core component and a sealing seat component, characterized in that the sealing seat component comprises a sealing seat, the sealing seat comprises 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 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 second cylindrical portion, the inner wall of the bushing comprises a lubricating portion made of a non-metallic material, and the valve core can slide axially relative to the bushing; the sealing seat component comprises a first axial limiting portion and a second axial limiting portion, and the bushing is limited between the first axial limiting portion and the second axial limiting portion.

[0006] In the electric valve of this scheme, a bushing is arranged between the outer wall of the valve core and the inner wall of the sealing seat. The inner wall of the bushing includes a lubricating portion made of non-metallic material. The contact surface between the outer wall of the valve core and the inner wall of the bushing is no longer the friction between two metal surfaces in the background technology, thereby improving the wear of the valve core, that is, improving the skewing of the valve core caused by the increase in the gap between the valve core and the sealing seat due to the friction of the valve core, thereby improving the valve closing reliability of the electric valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The figure shows a partial structural schematic diagram of an electric valve of the background technology;

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

[0009] Figure 3A Shown Figure 2 A schematic diagram of the local structure of the middle valve body, the dynamic seal seat component and the bushing;

[0010] Figure 3B Shown Figure 3A A local enlarged view of I1 in the middle;

[0011] Figure 4A Shown Figure 2 A schematic diagram of a modified example of the local structure of the middle valve body, the dynamic seal seat component and the bushing;

[0012] Figure 4B Shown Figure 4A A local enlarged view of I2 in the middle;

[0013] Figure 5 It is a structural schematic diagram of a bushing embodiment 1 of the electric valve of the present invention;

[0014] Figure 6 Shown is a structural schematic diagram of a first modification of the bushing;

[0015] Figure 7 Shown is a schematic structural diagram of a second modification of the bushing;

[0016] Figure 8 The figure shows the structure schematic diagram of the third modification of the bushing;

[0017] Fig. 9 The figure shows a schematic structural diagram of a fourth modification of the bushing;

[0018] Fig.10 The figure shows a schematic structural diagram of a fifth modification of the bushing;

[0019] Fig.11 Shown is a schematic structural diagram of a bushing of another structure;

[0020] Fig.12 The figure shows a schematic diagram of a valve core of an electric valve being lifted relative to a sealing member;

[0021] Fig.13 Shown Figure 2 The structural diagram of I3 in the figure;

[0022] Fig.14The figure shows a schematic diagram of the structure after the lift of the valve core of the electric valve relative to the seal is absorbed by the seal. DETAILED DESCRIPTION

[0023] It should be noted that if directional words, such as "upper" and "lower", are used in this article, they are defined based on the illustrated positions in the drawings of this specification. It should be understood that the use of the directional words is only for the clarity and convenience of describing the technical solution and should not constitute a limitation on the scope of protection.

[0024] In order to enable those skilled in the art to better understand the technical solution of the present application, the technical solution of the present application is further described below in conjunction with the accompanying drawings and specific embodiments.

[0025] Figure 2 FIG. 1 is a schematic diagram showing a specific embodiment of the electric valve of the present invention. Figure 3A Shown Figure 2 Schematic diagram of the partial structure of the middle valve body, dynamic seal seat and bushing. Figure 3B Shown Figure 3A A local enlarged view of I1 in the middle. Figure 4A Shown Figure 2 Schematic diagram of a modified example of the local structure of the valve body, the dynamic seal seat component and the bushing. Figure 4B Shown Figure 4A A partial enlarged view of I2 in the middle. Figure 5 Shown is a structural schematic diagram of a bushing embodiment 1 of the electric valve of the present invention.

[0026] like Figure 2-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 transmission rod 60 of a driving component, and a valve seat component 70. The valve body component 10 includes a valve body 11, and the valve body 11 is connected to a first connecting pipe A. The sealing seat component 40 includes a sealing seat 41, and the sealing seat 41 is welded and fixed to the valve body 11. The sealing component 30 is arranged between the inner wall of the sealing seat 41 and the outer wall of the valve core component 20, and the sealing component 30 forms 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 member 72 fixedly connected to the valve seat 71, and the sealing member 72 can be elastically deformed under the action of an external force, and the valve seat 71 is connected to a second connecting pipe B. The valve core component 20 includes a valve core 21, and a bushing 80 is arranged between the outer wall of the valve core 21 and the inner wall of the sealing seat 41. The inner wall of the bushing 80 includes a lubricating portion made of a 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 slidably matched. The bushing 80 is a straight cylindrical shape, and the bushing 80 is made of self-lubricating plastic materials such as PTFE or PPS material. At this time, the inner wall of the bushing 80 serves as a lubricating portion. The nut 50 will move in the axial direction of the sealing seat 41 under the transmission action of the transmission rod 60, and 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.

[0027] In the electric valve of this scheme, a sleeve 80 is arranged between the outer wall of the valve core 21 and the inner wall of the sealing seat 41. The sleeve 80 is limitedly connected to the sealing seat 41, and the sleeve 80 is made of self-lubricating plastic material. The outer wall of the valve core 21 and the inner wall of the sleeve 80 are slidably matched. Once the valve core 21 and the sleeve 80 rub against each other, the contact surface between the two is no longer the friction between the two metal surfaces in the background technology, thereby improving the wear of the valve core 21, that is, improving the skewness of the valve core 21 caused by the increase in the gap between the valve core 21 and the sealing seat 41 due to the friction of the valve core 21, thereby improving the valve closing reliability of the electric valve.

[0028] The specific embodiment of the position-limiting connection between the bushing 80 and the sealing seat component 40 is described below.

[0029] like Figure 3A and Figure 3B As shown, the sealing seat 41 is made of a metal material, and includes a first cylindrical portion 411 and a second cylindrical portion 412 located at the lower side of 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, so that 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. The first step portion 413 serves as a first axial limiting portion, so that the first axial limiting portion is directly formed by the sealing seat 41, which is beneficial to reducing parts and reducing costs.

[0030] The sealing seat component 40 also includes a stopper 42, which can be an annular gasket made of a metal material. The lower end of the sealing seat 41 includes a thin-walled portion 414 whose wall thickness is less than that of the second cylindrical portion 412, so that a second step portion 415 is formed between the second cylindrical portion 412 and the thin-walled portion 414 of the sealing seat 41. After the upper end surface of the stopper 42 abuts against the second step portion 415, the thin-walled portion 414 and the stopper 42 are fixed by riveting. The portion of the upper end surface of the stopper 42 that is not matched with the second step portion 415 includes a second stopper 416. The second stopper 416 is conveniently arranged and simple and easy to operate. The bushing 80 is arranged between the second cylindrical portion 412 and the valve core 21, and the bushing 80 is axially limited between the first stopper 413 and the second stopper 416. The bushing 80 is limited between the first limiting portion 413 and the second limiting portion 416, which means that the bushing 80 does not separate from the sealing seat 41, and if the bushing 80 slides axially relative to the sealing seat 41, the first limiting portion 413 limits the bushing 80 from continuing to slide upward relative to the sealing seat 41, and the second limiting portion 416 limits the bushing 80 from continuing to slide downward relative to the sealing seat 41.

[0031] Since the bushing 80 is made of a self-lubricating plastic material and is disposed between the sealing seat 41 and the valve core 21, the bushing 80 may be squeezed during the sliding of the valve core 21, so that the gap between the valve core 21 and the bushing 80 may be too small or disappear, causing the valve core 21 to become stuck. In order to prevent the occurrence of this stuck phenomenon, a preset axial displacement of more than 0.3 mm is provided between the first axial limit portion 413 and the second axial limit portion 416, thereby providing a deformation space for the axial deformation of the bushing 80.

[0032] It should be noted that the bushing 80 can also be Fig.11 shown. Fig.11 Shown is a schematic structural diagram of a bushing with another structure. Fig.11 The M line is only for the purpose of illustration and does not mean that there is a dividing line visible to the naked eye in the bushing. Fig.11 As shown, the bushing 80F includes a body portion 81F and a lubricating portion 82F, the body portion 81F is made of metal material, the lubricating portion 82F is made of lubricating material, the lubricating portion 82F is attached to the inner side and / or outer side of the body portion 81F by plating or the like, or the lubricating portion 82F is attached to the inner side and / or outer side of the body portion 81F by plating or the like. The lubricating portion 82F is provided to reduce the wear of the valve core 21 relative to the sealing seat during the axial sliding process, that is, to improve the skewness of the valve core caused by the increase in the gap between the valve core and the sealing seat due to the friction of the valve core, and also to improve the valve closing reliability of the electric valve.

[0033] During the research and development process, the applicant discovered that the electric valve sometimes has internal leakage, but because the electric valve has many parts, it was impossible to determine the leakage point for a long time. After unremitting efforts, the applicant discovered that one of the main causes of internal leakage is that the valve core 21 is axially skewed relative to the seal 72, causing the lower end of the valve core 21 to tilt upward relative to the seal 72.

[0034] Fig.12 The figure shows the schematic diagram of the valve core of the electric valve being lifted relative to the seal. Fig.13 Shown Figure 2 The structural diagram of I3 in the figure is as follows: Fig.14 The figure shows a schematic diagram of the structure of the electric valve after the lift of the valve core relative to the seal is absorbed by the elastic deformation of the seal. Fig.14 The illustration of the middle valve core being pressed into the seal may be a little exaggerated, but this is only for the convenience of illustrating the technical effect and is not a limitation of the embodiments of the invention.

[0035] After the valve core 21 is tilted, Fig.12 As shown in FIG. 1 , the tilting C of the valve core 21 relative to the sealing member 72 causes internal leakage of the electric valve. In order to improve the internal leakage, as shown in FIG. Figure 2 and Figure 12-14 As shown, the seal 72 can be elastically deformed under the action of external force. In this article, the seal 72 is made of a soft sealing material. Specifically, the seal 72 can be made of a hydrogenated nitrile rubber material. The valve core 21 includes a straight section 210. When the valve core 21 is skewed, the valve core 21 has a first position P in contact with the first cylindrical portion 411 of the valve seat 41 and a second position Q in contact with the bushing 80. The straight section 210 refers to the section of the valve core 21 located between the first position P and the second position Q, and its length is a. The outer wall of the straight section 210 is roughly arranged with equal diameters, and its outer diameter is D. When the valve core 21 is skewed relative to the seal 72, the wear of the valve core 21 at the second position Q is greater than the wear at the first position P. Due to the provision of the bushing 80, the wear between the valve core 21 and the bushing 80 is very small, and the radial gap between the two can also be set smaller than the radial gap between the first cylindrical portion 411 and the valve core 21.

[0036] Define the outer diameter of the straight section as D, the inner diameter of the first cylindrical portion as D1, and the inner diameter of the bushing as D2. Accordingly, the first sliding clearance between the sealing seat 41 and the outer wall of the straight section 210 is (D1-D) / 2, and the second sliding clearance between the inner wall of the bushing 80 and the outer wall of the straight section 210 is (D2-D) / 2. When the valve core 21 is skewed when abutting against the sealing member 72, the tilting of the valve core 21 relative to the sealing member 72 is C=max(D1-D, D2-D)*D / a, as Fig.14As shown in FIG. 1 , when the valve core 21 is lifted relative to the seal 72, the seal 72 will be elastically deformed, and the portion of the valve core 21 that abuts against the seal 72 will be pressed into the seal 72, that is, the seal 72 will absorb a portion of the lift. The best state is as follows Fig.14 In this way, the valve core 21 is pressed into the seal 72 until the lower end surface of the lifted portion of the valve core 21 contacts the seal 72. In order to improve the internal leakage of the electric valve due to the lifting, max(D1-D, D2-D)*D / a≤0.5mm. In this way, it can be ensured that the lifting amount of the valve core 21 relative to the seal 72 can be reliably absorbed by the seal 72. For example, when the seal 72 is made of hydrogenated nitrile rubber material, max(D1-D, D2-D)*D / a≤0.2mm.

[0037] Through the above design, max(D1-D, D2-D)*D / a≤0.5mm, so that the tilting of the valve core 21 relative to the sealing member 72 can be absorbed by the sealing member 72. On the premise of meeting the size requirement, since in the above formula, after the electric valve is designed, the values ​​of its dimensions D and a are fixed, and since the sealing member 72 made of the aforementioned material is provided, it is possible to control the value of max(D1-D, D2-D)*D / a by controlling the size of D1-D or D2-D, so that it is less than or equal to 0.5mm, thereby improving the leakage of the electric valve, that is, improving the closing reliability of the electric valve.

[0038] Among them, there is a first sliding gap (D1-D) / 2 between the inner wall of the first cylindrical portion 411 and the outer wall of the straight section 210, and a second sliding gap (D1-D) / 2 is included between the inner wall of the bushing 80 and the outer wall of the straight section 210, and D2-D≤D1-D is used to increase the wear reduction effect of the bushing 80 on the valve core 21 during the axial sliding of the valve core 21. In addition, 0.1mm≤D1-D≤0.22mm, 0.1mm≤D2-D≤0.22mm. The benefit is that it can take into account the influence of the first sliding gap (D1-D2) / 2 between the inner wall of the first cylindrical portion 411 and the outer wall of the straight section 210 and the second sliding gap (D1-D) / 2 between the inner wall of the bushing 80 and the outer wall of the straight section 210 on the tilting amount of the valve core 21.

[0039] The minimum radial clearance between the inner wall of the second stopper 42A and the outer wall of the valve core 21 is smaller than the clearance (D1-D) / 2 between the inner wall of the bushing 80 and the outer wall of the valve core 21, so as to prevent the inner wall of the second stopper 42A from scratching the outer wall of the valve core 21. Since the specific structure of the second stopper 42A is not limited, its shape can be a circular ring with equal inner diameter and outer diameter. In this case, the minimum radial clearance refers to the unilateral clearance between the inner wall of the second stopper 42A and the outer wall of the valve core 21. When the second stopper 42A is not in the above circular ring shape, the minimum radial clearance refers to the minimum clearance between the inner wall of the second stopper 42A and the outer wall of the valve core 21.

[0040] It should be noted that the sealing seat component 40A may also be of the following Figure 4A The sealing seat component 40A and the bushing 80 can also be connected in the same manner as shown in FIG. Figure 4A and Figure 4B Design as shown.

[0041] like Figure 4A and Figure 4B As shown, the sealing seat component 40A includes a sealing seat 41A and a stopper 42A. The sealing seat 41A is made of metal material 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. In this way, a first step portion 413A is formed between the inner wall of the first cylindrical portion 411A and the inner wall of the second cylindrical portion 412A. The portion 413A serves as the first axial limiting portion, the limiting member 42A can be an annular gasket made of metal material, and the lower end portion of the sealing seat 41A includes a thin-walled portion 414A whose wall thickness is less than that of the second cylindrical portion 412A, so that a second step portion 415A is formed between the second cylindrical portion 412A of the sealing seat 41A and the thin-walled portion 414A, and after the upper end surface 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 surface of the limiting member 42A that is not matched with the second step portion 415A includes a second limiting portion 416A. The second limiting portion 416A is convenient to set up, simple and easy. The bushing 80 is limited between the first limiting portion 413A and the second limiting portion 416A. The bushing 80 is limited between the first limiting portion 413A and the second limiting portion 416A, which means that the bushing 80 does not separate from the sealing seat 41A, and if the bushing 80 slides axially relative to the sealing seat 41A, the first limiting portion 413A limits the upward sliding of the bushing 80 relative to the sealing seat 41A, and the second limiting portion 416A limits the downward sliding of the bushing 80 relative to the sealing seat 41A.

[0042] Since the bushing 80 is made of a self-lubricating plastic material and is disposed between the sealing seat 41A and the valve core 21, the bushing 80 may be squeezed during the sliding of the valve core 21, so that the gap between the valve core 21 and the bushing 80 may be too small or disappear, causing the valve core 21 to become stuck. In order to prevent the occurrence of this stuck phenomenon, a preset axial displacement of more than 0.3 mm is provided between the first axial limit portion 413A and the second axial limit portion 416A, thereby providing a deformation space for the bushing 80.

[0043] In each embodiment, when the bushing 80 is made of a self-lubricating plastic material, its structure can be designed as follows: Figure 5 In addition to the structure shown, you can also Figure 6 - The deformed design shown in 11. Figure 6 The figure shows the structure schematic diagram of the first modification of the bushing. Figure 7 The figure shows the structure diagram of the second modification of the bushing. Figure 8 Shown is a schematic structural diagram of a third modification of the bushing.

[0044] like Figures 6 to 8 As shown, the inner wall of the bushing can be provided with a recessed portion, and the number of the recessed portions is not limited. The shape of the recessed portion is a groove, such as Figure 6 As shown, the inner wall of the bushing 80A is provided with four grooves 81A at intervals, and the four grooves 81A are rectangular grooves. Figure 7 As shown, the inner wall of the bushing 80B is provided with four grooves 81B at intervals, and the inner wall surfaces of the four grooves 81B are arc-shaped. Figure 8 As shown, four grooves 81C are provided at intervals on the inner wall of the bushing 80C, and the inner wall surfaces of the four grooves 81C are semicircular.

[0045] Fig. 9 The figure shows the structure diagram of the fourth modification of the bushing. Fig.10 The figure shows the structure diagram of the fifth modification of the bushing. Figures 9 to 10 As shown, the upper end of the bushing has a plurality of notches, or the lower end of the bushing has a plurality of notches, or both the upper end and the lower end of the bushing are provided with a plurality of notches.

[0046] like Fig. 9 As shown, the upper end of the bushing 80D is provided with four notches 82D at intervals, and the four notches 82D are connected to the upper end surface of the bushing 80D. Fig.10 As shown, four notches 82E are respectively provided at intervals on the upper end and the lower end of the bushing 80E.

[0047] Figures 6 to 11 The effect of the groove or notch designed in the bushing shown is to provide deformation space for radial deformation of the bushing, thereby preventing the valve core from being stuck due to plastic deformation of the bushing.

[0048] The above is an example of the electric valve provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An electric valve, comprising a valve core component and a sealing seat component, characterized in that: The sealing seat component includes a sealing seat, and 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 valve core component includes a valve core, a bushing is provided between the outer wall of the valve core and the inner wall of the second cylindrical portion, the inner wall of the bushing includes a lubrication portion made of a non-metallic material, and the valve core can slide axially relative to the bushing; the sealing seat component includes a first axial limiting portion and a second axial limiting portion, and the bushing is limited between the first axial limiting portion and the second axial limiting portion.

2. The electric valve according to claim 1, characterized in that: The bushing is made of self-lubricating plastic material, and the inner wall of the bushing serves as the lubricating portion; or, the bushing includes a main body and the lubricating portion, the main body is made of metal material, and the lubricating portion is attached to the inner wall of the main body; the bushing has a preset axial displacement between the first axial limit portion and the second axial limit portion.

3. The electric valve according to claim 1, characterized in that: The bushing is made of self-lubricating plastic material, and the inner wall of the bushing serves as the lubricating portion; or, the bushing includes a main body and the lubricating portion, the main body is made of metal material, and the lubricating portion is attached to the inner wall of the main body; the bushing has a preset axial displacement between the first axial limit portion and the second axial limit portion, and the axial displacement is greater than 0.3 mm.

4. The electric valve according to claim 1, characterized in that: The valve core is made of metal material, the sealing seat is made of metal material, the bushing is made of PTFE or PPS material, the first axial limit portion is included between the inner wall of the first cylindrical part and the inner wall of the second cylindrical part, and the bushing has a preset axial displacement between the first axial limit portion and the second axial limit portion.

5. The electric valve according to claim 4, characterized in that: The valve core is made of metal material, the sealing seat is made of metal material, the bushing is made of PTFE or PPS material, the first axial limit portion is included between the inner wall of the first cylindrical part and the inner wall of the second cylindrical part, and the bushing has a preset axial displacement between the first axial limit portion and the second axial limit portion, and the axial displacement is greater than 0.3 mm.

6. The electric valve according to any one of claims 1 to 5, characterized in that: The bushing is made of PTFE material, and the length of the straight section of the valve core that is gap-matched with the sealing seat and the bushing is defined as a, and the outer diameter of the straight section is roughly equal in diameter. The outer diameter of the straight section is defined as D, the inner diameter of the first cylindrical portion is defined as D1, and the inner diameter of the bushing is defined as D2, D2-D≤D1-D, and 0.1mm≤D1-D≤0.22mm, 0.1mm≤D2-D≤0.22mm.

7. The electric valve according to any one of claims 1 to 5, characterized in that: The electric valve also includes a valve seat component, which includes a sealing member made of hydrogenated nitrile rubber material. The length of the straight section of the valve core that is gap-matched with the sealing seat and the bushing is defined as a, and the outer diameter of the straight section is roughly equal in diameter. The outer diameter of the straight section is defined as D, the inner diameter of the first cylindrical portion is defined as D1, and the inner diameter of the bushing is defined as D2, D2-D≤D1-D, and 0.1mm≤D1-D≤0.22mm, 0.1mm≤D2-D≤0.22mm.

8. The electric valve according to any one of claims 1 to 7, characterized in that: The sealing seat component further includes a limiting member, the limiting member includes the second axial limiting portion, the limiting member is fixed to the sealing seat by riveting, or the limiting member is fixed to the sealing seat by welding.

9. The electric valve according to claim 8, characterized in that: The inner wall or the outer wall of the bushing has a recessed portion, there are two or more recessed portions, and the recessed portions are arranged at intervals.

10. The electric valve according to claim 8, characterized in that: The upper end of the bushing has a plurality of notches, wherein the number of notches at the upper end of the bushing is more than two, and the notches are spaced apart in the radial direction of the bushing, and / or the number of notches at the lower end of the bushing is more than two, and the notches are spaced apart in the radial direction of the bushing.

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