An electric valve

Abstract

The present invention discloses an electric valve. The guiding component includes a guiding sleeve which is cylindrical. The guiding sleeve includes a first anti-rotation portion and a bearing mounting portion. A bearing is seated on the bearing mounting portion. The bearing includes an inner race and an outer race. The guiding sleeve is fixedly connected to the inner race of the bearing. A threaded shaft passes through the bearing. The valve core component includes an internal thread portion and a first mating portion. The internal thread portion is threadedly connected to the external thread portion. The first anti-rotation portion and the first mating portion are in concave-convex fit so that the guiding sleeve restricts the circumferential rotation of the valve core component. The threaded shaft can drive the valve core component to move axially along the valve body component. The valve core component can approach or move away from the valve port portion of the electric valve. The guiding sleeve further includes a stop portion which is located between the bearing and the valve core component. The stop portion includes an inner convex portion. The valve core component can abut against the inner convex portion. The inner convex portion can limit the maximum stroke of the valve core component moving away from the valve port portion, and can reduce the number of components of the electric valve.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid control, and particularly to an electric valve. Background Art

[0002] Figure 1 The following shows a partial structural schematic diagram of an electric valve in the background art. The electric valve includes a rotor 01, a valve core component 04, a nut 02, a valve core seat 03, and a stop mechanism 05. The valve core component 04 can axially move relative to the valve core seat 03. The stop mechanism 05 limits the maximum axial stroke of the valve core component 04, and the inner wall of the valve core seat 03 guides the axial movement of the valve core component 04. Summary of the Invention

[0003] The object of the present application is to provide an electric valve, which includes a valve body component, a guiding component, a transmission component, and a valve core component. The guiding component includes a guiding sleeve, the guiding sleeve is in a cylindrical shape, and the guiding sleeve is directly or indirectly fixedly connected to the valve body component. The transmission component includes a threaded shaft and a bearing. The threaded shaft includes an external thread portion. The guiding sleeve includes a first anti-rotation portion and a bearing mounting portion. The bearing is located in the bearing mounting portion. The bearing includes a bearing inner ring and a bearing outer ring. The guiding sleeve is fixedly connected to the bearing inner ring. The threaded shaft passes through the bearing. The valve core component includes an internal thread portion and a first mating portion. The internal thread portion is threadedly connected to the external thread portion. The first anti-rotation portion and the first mating portion are in concave-convex fit so that the guiding sleeve restricts the circumferential rotation of the valve core component. The threaded shaft can drive the valve core component to axially move along the valve body component. The valve core component can approach or move away from the valve port portion of the electric valve. The guiding sleeve further includes a stop portion, the stop portion is located between the bearing and the valve core component, the stop portion includes an inner convex portion, the valve core component can abut against the inner convex portion, and the inner convex portion can limit the maximum stroke of the valve core component moving away from the valve port portion.

[0004] For the electric valve of this solution, the guiding sleeve is fixedly connected to the valve body component. The guiding sleeve restricts the circumferential rotation of the valve core component and restricts the maximum axial stroke of the valve core component. Moreover, the bearing is located in the bearing mounting portion of the guiding sleeve. Thus, the number of components of the electric valve can be reduced. Description of the Drawings

[0005] Figure 1 The following shows a structural schematic diagram of an electric valve in the background art;

[0006] Figure 2 The following shows a structural schematic diagram of the first specific embodiment of the electric valve of the present invention;

[0007] Figure 3 The following shows Figure 2Enlarged schematic view at I1;

[0008] Figure 4 As shown Figure 2 Half-section solid view of the guide sleeve in the [device];

[0009] Figure 5 As shown Figure 2 Solid view of the spool component in the [device];

[0010] Figure 6 As shown Figure 2 Solid view of the second connecting piece in the [device];

[0011] Figure 7 As shown Figure 6 Cross-sectional view of the second connecting piece;

[0012] Figure 8 As shown Figure 2 Solid view of the valve head in the [device];

[0013] Figure 9 As shown is the structural schematic diagram of the second specific embodiment of the electric valve of the present invention;

[0014] Figure 10 As shown Figure 9 Enlarged schematic view at I2; Detailed implementation manners

[0015] It should be noted first that if orientation words such as "upper" and "lower" are used in this article, they are defined based on the positions shown in the accompanying drawings of this specification. It should be understood that the use of the orientation words is only for the clarity and convenience of describing the technical solution, and should not limit the scope of protection.

[0016] To enable those skilled in the art of the present technology 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.

[0017] As Figure 2 、 Figure 3 As shown, the electric valve includes a valve body component 1, a guiding component 2, a transmission component 3, and a spool component 4.

[0018] Among them, the valve body component 1 includes an upper valve body 11 and a lower valve body component 12. The lower valve body component 12 includes a lower valve body 121 and a valve port seat 122. The valve port seat 122 is partially located inside the lower valve body 121. The valve port seat 122 extends out from the lower opening of the lower valve body 121 and is welded and fixed to the first connecting pipe A. The valve port seat 122 includes a valve port portion 1220. Here, it can be understood that it is also possible to arrange the valve port portion 1220 of the electric valve on the lower valve body 121. The lower end of the upper valve body 11 is welded and fixed to the lower valve body 121. The transmission component 3, the guiding component 2, and the spool component 4 are arranged inside the cavity of the valve body component 1.

[0019] As Figure 2 and Figure 4 shown, the guiding member 2 includes a guiding sleeve 21, and the guiding sleeve 21 is cylindrical. The guiding sleeve 21 is directly welded and fixed to the lower valve body 121 or indirectly fixed through a third member, or the guiding sleeve 21 is press-fitted and interference-fitted with the lower valve body 121. When the guiding sleeve 21 is directly welded and fixed to the lower valve body 121 or press-fitted and interference-fitted, it is easier to ensure the coaxiality between the guiding sleeve 21 and the lower valve body 121. The transmission member 3 includes a threaded shaft 31, a bearing 32, and a rotor 33. The upper end of the guiding sleeve 21 extends into the rotor 33, that is, the guiding sleeve 21 is partially located inside the rotor 33, which can effectively utilize the internal space of the rotor 33 and reduce the axial and radial dimensions of the electric valve. The threaded shaft 31 includes an external thread portion 311. The guiding sleeve 21 restricts the axial movement of the transmission member 3 relative to the valve body member 1. Specifically, as shown in the figure, the guiding sleeve 21 includes a bearing mounting portion 20. As Figure 4 shown, the bearing mounting portion 20 includes a convex ring 25 protruding toward the threaded shaft 31 as a bearing support portion, and the bearing 32 is at least partially located inside the bearing mounting portion 20 and sits on the convex ring 25. The bearing mounting portion 20 is fixedly connected to the bearing 32, and the fixed connection method can be direct riveting, welding or clamping through a third member between the two.

[0020] The bearing 32 includes a bearing inner ring 321 and a bearing outer ring 322. The bearing outer ring 322 is fixedly connected to the bearing mounting portion 20, so that the bearing outer ring 322 does not rotate circumferentially relative to the guiding sleeve 21. The threaded shaft 31 penetrates through the bearing inner ring 321, and the threaded shaft 31 is in clearance fit or interference fit with the bearing inner ring 321, and there are balls between the bearing inner ring 321 and the bearing outer ring 322. The specific connection method between the bearing inner ring 321 and the threaded shaft 31 is as follows: The transmission member 3 includes a fixing sleeve 34. The fixing sleeve 34 is sleeved or clamped onto the outer circumference of the threaded shaft 31, and the fixing sleeve 34 is in interference fit or welded and fixed with the threaded shaft 31. The threaded shaft 31 includes a side convex portion 310, and the bearing inner ring 321 is directly abutted against the fixing sleeve 34 and the side convex portion 310.

[0021] As Figure 3 、 Figure 5 shown, the valve core member 4 can approach or move away from the valve port portion 1220 of the electric valve. The valve core member 4 includes a connecting member 41 and a valve head member 42. The guiding sleeve 21 includes a guiding sleeve mating surface 215, and the connecting member 41 includes a valve core mating surface 4134. During the axial movement of the valve core member 4 along the valve body member 1, the valve core mating surface 4134 and the guiding sleeve mating surface 215 are in sliding fit, so that the guiding sleeve 21 provides guidance for the axial movement of the valve core member 4.

[0022] The connecting component 41 is in sliding fit with the guide sleeve 21. The valve head component 42 is fixedly connected to the connecting component 41. As Figure 2 and Figure 4 shown, the guide sleeve 21 includes a first anti-rotation portion 211, the connecting component 41 includes an internal thread portion 411 and a first mating portion 412, and the internal thread portion 411 is in threaded connection with the external thread portion 311 of the threaded shaft 31. One of the first anti-rotation portion 211 and the first mating portion 412 is a convex portion, and the other is a concave portion. The guide sleeve 21 and the valve core component 4 are in concave-convex fit through the convex portion and the concave portion, so that the guide sleeve 21 can limit the circumferential rotation of the valve core component 4 relative to the guide sleeve 21. Furthermore, the threaded shaft 31 can drive the valve core component 4 to move axially along the valve body component 1 to open or close the valve port portion 1220 of the electric valve.

[0023] The guide sleeve 21 includes a stop portion 214. The stop portion 214 is an inner convex portion protruding radially toward the threaded shaft 31 relative to the mating surface 215 of the guide sleeve 21. It can be a ring or a plurality of ribs. The stop portion 214 is located between the lower end of the bearing 32 and the valve core component 4. The valve core component 4 can abut against the stop portion 214, that is, the stop portion 214 can limit the maximum stroke of the valve core component 4 away from the valve port portion 1220, so that the valve core component 4 stops moving further away from the valve port portion 1220 when it reaches the maximum stroke. The stop portion 214 and the bearing support portion 25 form a stepped hole. The upper end surface of the stop portion 214 is closer to the valve port portion 1220 than the upper end surface of the bearing support portion 25. That is, the bearing support portion 25 and the stop portion 214 are arranged axially offset in the guide sleeve 21, aiming to prevent interference with the following inner ring 321 of the bearing.

[0024] The guide sleeve 21 includes a groove 211 recessed toward the outer wall direction of the guide sleeve 21 relative to the mating surface 215 of the guide sleeve 21. The groove 211 is the aforementioned concave portion (first anti-rotation portion) for concave-convex fit with the valve core component 4. The number of grooves 211 is four in this embodiment and is arranged at intervals along the circumferential direction of the guide sleeve 21.

[0025] In the electric valve of the present application, the guide sleeve 21 is fixedly connected to the valve body component 1. The valve body component 1 axially positions the guide sleeve 21. The guide sleeve 21 also supports the transmission component 3. Moreover, the guide sleeve 21 further limits the circumferential rotation of the valve core component 4. Thus, the guide sleeve 21 has multiple functions, can well reduce the number of components of the electric valve, and on this basis, the guide sleeve 21 partially extends into the rotor 33, which can make the overall structure of the electric valve more compact.

[0026] As Figure 3 shown, the valve core component 4 includes an inner cavity 40. The inner cavity 40 is located between the threaded shaft 31 and the valve head component 42. Figure 3In it, the inner cavity 40 is generally surrounded by the lower surface of the threaded shaft 31, the inner wall of the connecting member 41, and the upper surface of the valve head member 42. After the electric valve is applied to the system, the fluid in the system can flow into the inner cavity 40 through the gap between the inner wall of the guide sleeve 21 and the outer wall of the valve core member 4. It can be understood that during the axial movement of the threaded shaft 31 driving the valve core member 4, the volume of the inner cavity 40 is variable. When the volume of the inner cavity 40 decreases, the pressure of the fluid in the inner cavity 40 will increase, generating a force that is not conducive to opening the electric valve and affecting the reliability of the movement of the valve core member 4 of the electric valve. For this reason, as Figure 3 shown, a pressure relief passage is included between the valve head member 42 and the connecting member 41. The pressure relief passage can be provided on the valve head member 42 or on the connecting member 41. The pressure relief passage communicates the inner cavity 40 with the outside of the valve core member 4, and the flow rate of the pressure relief passage is greater than the flow rate between the internal thread portion 411 and the external thread portion 311. Thus, the pressure in the inner cavity 40 is preferentially released through the pressure relief passage, rather than only leaking out through the thread gap between the internal thread portion 411 and the external thread portion 311, improving the reliability of the movement of the valve core member 4 during the valve opening process of the electric valve.

[0027] The setting of the pressure relief passage in the first embodiment will be described in detail below. As Figure 3 shown, the connecting member 41 includes a first connecting member 413 and a second connecting member 414. The first connecting member 413 is at least partially located within the guide sleeve 21. The first connecting member 413 is slidably engaged with the guide sleeve 21. The first connecting member 413 is made of a non-metallic material, which can facilitate the shaping of the first connecting member 413 and reduce the wear between the first connecting member 413 and the guide sleeve 21 and between the first connecting member 413 and the threaded shaft 31. The second connecting member 414 is made of a metallic material, and the second connecting member 414 is injection-molded and fixed to the first connecting member 413. The first connecting member 413 includes the aforementioned internal thread portion 411. The lower end of the threaded shaft 31 extends into the internal thread portion 411, and the external thread portion 311 of the threaded shaft 31 is threadedly connected to the internal thread portion 411 so that the threaded shaft 31 can drive the valve core member 4 away from or close to (including abutting against) the valve port portion 1220.

[0028] As Figure 5 shown, the first connecting member 413 includes the aforementioned valve core mating surface 4134. The outer edge contour line of the valve core mating surface 4134 is circular. The first connecting member 413 includes the aforementioned first mating portion. The first mating portion has a plurality of convex blocks 412 that radially protrude relative to the valve core mating surface 4134. The plurality of convex blocks 412 serve as convex portions that are in concave-convex fit with the concave portions of the guide sleeve 21. In this article, the convex blocks 412 are ribs along the first connecting member. The number of convex blocks 412 corresponds to the number of the aforementioned grooves 211. In the embodiment of this article, both are set to four.

[0029] The valve head component 42 includes a valve head 421 and a sealing ring 422. The valve head 421 is made of a metallic material, and the valve head 421 is fixedly connected to the second connecting member 413 by welding, or by interference fit, or by threaded connection. In this embodiment, the valve head 421 includes an insertion portion 4210, and the second connecting member 414 includes a jack 4141. The insertion portion 4210 is at least partially located within the jack 4141 and is in interference fit with the inner wall of the jack 4141.

[0030] As Figure 3 、 Figure 8 shown, the pressure relief passage includes a first passage M, and the first passage M is located between the outer wall of the insertion portion 4210 and the inner wall of the jack 4141.

[0031] As shown in FIG. 3 and Figure 4 、 Figure 8 shown, the insertion portion 4210 is columnar with a cut surface 4211, and the jack 4141 includes a straight hole 4142 and a flared hole 4143. The opening of the flared hole 4143 is arranged with a smaller upper part and a larger lower part. The smaller end of the opening is connected to the lower end of the straight hole 4142. A main passage M1 is formed between the cut surface 4211 and the inner wall of the straight hole 4142, and a guiding passage M2 is formed between the cut surface 4211 and the inner wall of the flared hole 4143. The first passage M includes the aforementioned main passage M1 and guiding passage M2. The structure of the first passage M is simple and convenient to process. The design of the guiding passage M2 can reduce the flow resistance, making it easier for the fluid in the inner cavity 40 to flow to the outside of the valve core component 4 through the main passage M1.

[0032] More specifically, as Figures 6 - 8 shown, the second connecting member 414 includes a base portion 4145 located within the first connecting member 413 and a radially protruding portion 4146 located on the lower side of the second connecting member 414. The base portion 4145 is perpendicular to the radially protruding portion 4146, and the base portion 4145 is provided with the aforementioned jack 4141. The inner wall of the larger end of the opening of the flared hole 4143 is connected to the lower surface of the radially protruding portion 4146. The valve head 421 includes a disc portion 4215, and the disc portion 4215 is perpendicular to the insertion portion 4210. The upper surface of the disc portion 4215 faces the lower surface of the radially protruding portion 4146. The upper surface of the disc portion 4215 includes a first plane 4212 and a second plane 4213, and the first plane 4212 is farther from the valve port portion 1220 than the second plane 4213. Thus, the disc portion 4215 forms a notch portion 4214. The cut surface 4211 is perpendicular to the second plane 4213, and the lower end of the cut surface 4211 is connected to the second plane 4213. The first passage M is located between the cut surface 4211 and the jack 4141. The pressure relief passage further includes a second passage N located between the second plane 4213 and the radially protruding portion 4146.

[0033] Based on this, it can be understood that the specific structural details of the pressure relief passage can be designed more flexibly. The pressure relief passage can be provided with a notch only on the valve head 421, and the notch cooperates with the second connecting member 414 to form the pressure relief passage. Or, the pressure relief passage can also be provided with a notch on the second connecting member 414, and the notch cooperates with the valve head 421 to form the pressure relief passage. Or notches are respectively formed on the second connecting member 414 and the valve head 421, and the pressure relief passage is formed by the cooperation of the notches on the two parts.

[0034] In this embodiment, the valve port seat 122 is made of a metal material. In order to achieve good internal leakage performance of the electric valve, as Figure 3 shown, the valve head component 42 further includes a sealing ring 422 made of a software material. The valve head 421 includes a sealing ring mounting portion 4217 located below the disc portion 4215. The sealing ring mounting portion 4217 is cylindrical, the disc portion 4215 is disc-shaped, the diameter of the lower end surface of the disc portion 4215 is larger than the diameter of the sealing ring mounting portion 4217, the sealing ring 422 is sleeved on the outer peripheral portion of the sealing ring mounting portion 4217, and the sealing ring 422 can abut against or separate from the valve port portion 1220 to close or open the electric valve.

[0035] The structure of the pressure relief passage in the electric valve of the first embodiment of the present application is described in detail above. For the electric valve with the above structure, when other structures remain unchanged, by changing the designs of the second connecting member and the valve head component, the electric valve of the second embodiment of the present application is formed.

[0036] As Figure 9 shown, in this embodiment, the parts with the same structure as those in the first embodiment use the same reference numerals. The electric valve includes a valve head component 42A, and the valve head component 42A includes a valve head 421A, an annular fixed seat 423A, and a sealing ring 422 made of a software material. The valve head 421A penetrates through the fixed seat 423A and is riveted or welded to the fixed seat 423A for fixation. The fixed seat 423A and the sealing ring 422 are circular rings. The outer diameter of the lower surface of the fixed seat 423A is larger than the outer diameter of the sealing ring 422. The sealing ring 422 is sleeved outside the valve head 421A and is located below the fixed seat 423A. The pressure relief passage is located between the fixed seat 423A and the second connecting member 414A. The valve head 421A and the fixed seat 423A are separately arranged. Compared with the valve head component 42 in the first embodiment, although there is one more part, since the fixed seat 423A is directly fixed to the second connecting member 414A, the axial dimension of the valve head 421A is reduced.

[0037] The second connecting member 414A includes a base portion 4145A located within the first connecting member 413 and a receiving portion 4146A located outside the first connecting member 413. The base portion 4145A is injection-molded and connected to the first connecting member 413. The receiving portion 4146A includes a stepped hole 4147A with a stepped surface 4148A facing the valve port portion 1220. The fixing seat 423A is at least partially located within the stepped hole 4147A, and the fixing seat 423A is in interference fit or welded to the hole wall of the stepped hole 4147A. The pressure relief passage includes a first passage MA1, and the first passage MA1 is located between the fixing seat 423A and the stepped surface 4148A and between the fixing seat 423A and the hole wall of the stepped hole 4147A. At this time, the specific structure and position of the first passage MA1 can be designed more flexibly. A notch portion can be provided only on the fixing seat 423A, only on the receiving portion 4146A of the second connecting member 414A, or notch portions can be provided on both the fixing seat 423A and the receiving portion 4146A of the second connecting member 414A respectively. Hereinafter, the case where a notch portion is provided only on the fixing seat 423A will be described.

[0038] As Figure 9 and Figure 10 shown, the inner cavity 40A is located between the threaded shaft 31 and the valve head component 42A. The fixing seat 423A includes an upper notch portion 4231A and a side notch portion 4232A. The upper notch portion 4231A and the side notch portion 4232A are perpendicularly arranged. The upper surface of the upper notch portion 4231A is arranged opposite to the stepped surface 4148A, and the side surface of the side notch portion 4232A is arranged opposite to the hole wall of the stepped hole 4147A. The first passage MA1 is located between the upper surface of the upper notch portion 4231A and the stepped surface 4148A and between the side surface of the side notch portion 4243A and the hole wall of the stepped hole 4147A, and the first passage MA1 is easy to machine.

[0039] Furthermore, as Figure 10 shown, the second connecting member 414 includes a flared hole 4143A that is larger at the bottom and smaller at the top. The lower end of the hole wall of the flared hole 4143A is connected to the stepped surface 4148A. In this embodiment, the flared hole 4143A is a part of the inner cavity 40A, and it guides the fluid flowing from the inner cavity 40A into the first passage MA1.

[0040] As Figure 9 and Figure 10As shown, the guide sleeve 21 includes an upper cavity O located above the first connecting member 413. The electric valve includes a lower cavity P located below the guide sleeve 21 within the valve body member 1 and an outer cavity Q located between the outer side of the guide sleeve 21 and the valve body member 4. Between the outer cavity Q and the upper cavity O, there is a first pressure balance hole 210 that connects the outer cavity Q and the upper cavity O, and the first pressure balance hole 210 releases the fluid pressure within the upper cavity O. Between the outer cavity Q and the lower cavity P, there is a second pressure balance hole 220 that connects the outer cavity Q and the lower cavity P. After the second pressure balance hole 220 connects the outer cavity Q and the lower cavity P, it can reduce the pressure impact of the fluid entering the lower cavity P on the guide sleeve 21 and the valve core member 4, preventing the valve core member 4 from deflecting relative to the valve orifice portion 1220 and affecting the performance of the electric valve, thereby improving the product reliability of the electric valve. As shown in the figure, the first pressure balance hole 210 is a radial through hole formed on the side wall of the guide sleeve 21. Of course, the specific shape of the first pressure balance hole 210 is not limited.

[0041] As Figure 2 , Figure 3 and Figure 4 shown, the guide sleeve 21 includes a first annular portion 23 and a second annular portion 24. The second annular portion 24 radially extends from the lower end of the first annular portion 23. The lower valve body 121 includes a positioning step 341 with a step surface facing the rotor 33. The guide sleeve 21 is seated on the positioning step 341. The cross-section of the outer wall of the first annular portion 23 is circular, and the cross-section of the outer wall of the second annular portion 24 is non-circular. The second annular portion 24 includes a fixed portion 241 seated on the positioning step 341 and a non-fixed portion 242 that does not contact the positioning step 341. The non-fixed portion 242 cooperates with the lower valve body 121 to form the second pressure balance hole 220, and the second pressure balance hole 220 has good manufacturability.

[0042] In Figure 9 the illustrated embodiment, an elastic member 34 is provided between the inner ring 321 of the bearing and the side convex portion 310. The elastic member 34 can be a spring or other components such as an elastic pressing plate. One end of the elastic member 34 abuts against the inner ring 321 of the bearing, and the other end of the elastic member abuts against the side convex portion 310. The provision of the elastic member 34 protects the electric valve when closing the valve. After the valve core member 4 just contacts the valve orifice portion 1220, if the valve core member 4 continues to move downward, the elastic member 34 will be compressed, avoiding damage to the threads of the internal thread portion 411 and the external thread portion 30 and affecting the action reliability of the electric valve.

[0043] In the above embodiments, a variant design can also be made by providing a pressure relief passage on the connecting member. For example, it is also possible to provide a groove or other form of notch on the connecting member as the pressure relief passage to cooperate with the valve head member, which can be understood based on the accompanying drawings in this article and will not be further illustrated with additional drawings.

[0044] The above has given an example introduction to the electric valve provided in this application. Specific examples are used in this text to elaborate on the principle and implementation manner of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of this application, several improvements and modifications can still be made to this application, 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 guiding component, a transmission component and a valve core component, characterized in that, The guiding component includes a guiding sleeve, which is cylindrical. The guiding sleeve is directly or indirectly fixedly connected to the valve body component. The transmission component includes a threaded shaft and a bearing. The threaded shaft includes an external thread portion. The guiding sleeve includes a first anti-rotation portion and a bearing mounting portion. The bearing is located in the bearing mounting portion. The bearing includes a bearing inner ring and a bearing outer ring. The guiding sleeve is fixedly connected to the bearing inner ring. The threaded shaft passes through the bearing. The valve core component includes an internal thread portion and a first mating portion. The internal thread portion is threadedly connected to the external thread portion. The first anti-rotation portion and the first mating portion are in concave-convex fit so that the guiding sleeve restricts the circumferential rotation of the valve core component. The threaded shaft can drive the valve core component to move axially along the valve body component. The valve core component can approach or move away from the valve port portion of the electric valve. The guiding sleeve further includes a stopping portion, which is located between the bearing and the valve core component. The stopping portion includes an inner convex portion. The valve core component can abut against the inner convex portion. The inner convex portion can limit the maximum stroke of the valve core component moving away from the valve port portion.

2. The electric valve according to claim 1, characterized in that, The guiding sleeve includes a guiding sleeve mating surface. The valve core component includes a valve core mating surface. The valve core mating surface is in sliding fit with the guiding sleeve mating surface. The guiding sleeve includes a groove recessed relative to the guiding sleeve mating surface. The valve core component includes a convex block protruding laterally relative to the valve core mating surface. At least a part of the convex block is located in the groove.

3. The electric valve according to claim 2, characterized in that, The valve core component includes a connecting component and a valve head component. The connecting component includes a first connecting piece and a second connecting piece. The first connecting piece is made of a non-metallic material. The second connecting piece is made of a metallic material. The second connecting piece is injection-molded and fixed to the first connecting piece. The valve head component is in interference fit or welded and fixed to the second connecting piece. The first connecting piece includes the internal thread portion and more than 3 convex blocks circumferentially spaced apart. The guiding sleeve includes a plurality of grooves corresponding to the number of convex blocks.

4. The electric valve according to any one of claims 1-3, characterized in that, The bearing mounting portion includes a bearing supporting portion. The bearing is located in the bearing supporting portion. The threaded shaft is in clearance fit or fixedly connected to the bearing inner ring. The guiding sleeve is directly or indirectly fixedly connected to the bearing outer ring.

5. The electric valve according to claim 4, wherein The bearing supporting portion is a convex ring. The stopping portion is an inner convex portion. The stopping portion and the bearing supporting portion form a stepped hole. The upper end surface of the stopping portion is closer to the valve port portion than the upper end surface of the bearing supporting portion.

6. The electric valve according to any one of claims 1 to 3, characterized in that, The transmission component includes an elastic member. The bearing includes a bearing inner ring and a bearing outer ring. The threaded shaft is in clearance fit or fixedly connected to the bearing inner ring. The guiding sleeve is directly or indirectly fixedly connected to the bearing outer ring. One end of the elastic member abuts against the bearing inner ring, and the other end of the elastic member abuts against the threaded shaft.

7. The electric valve according to claim 3, characterized in that, The valve head component includes a valve head and a sealing ring made of a soft material. The valve head includes an insertion part, a circular disc-shaped part located below the insertion part, and a cylindrical sealing ring mounting part located below the disc-shaped part. The disc-shaped part is perpendicular to the insertion part. The outer diameter of the disc-shaped part is larger than the outer diameter of the sealing ring mounting part. The sealing ring is sleeved on the outer periphery of the sealing ring mounting part, and the sealing ring can abut against the valve port part.

8. The electric valve according to claim 3, characterized in that, The valve head component includes a valve head, a fixing seat, and a sealing ring made of a soft material. The valve head penetrates through the fixing seat, and the valve head is fixed to the fixing seat by riveting or welding. The second connecting member includes a base part located inside the first connecting member and a receiving part located outside the second connecting member. The base part is injection-molded and connected to the first connecting member. The receiving part includes a stepped hole with a downward-facing stepped surface. At least a part of the fixing seat is located in the stepped hole, and the fixing seat is in interference fit or welded and fixed to the second connecting member. The sealing ring is located below the fixing seat, and the sealing ring is sleeved on the outside of the valve head. The sealing ring can abut against or separate from the valve port part.

9. The electric valve according to claim 1 or 2, characterized in that The valve core component includes a connecting component and a valve head component. The connecting component includes a first connecting member. The inner cavity of the valve core component is located between the threaded shaft and the valve head component. There is a pressure relief passage between the valve head component and the connecting component. The pressure relief passage is communicated with the inner cavity and the outside of the valve core component. The flow rate of the pressure relief passage is larger than the flow rate between the internal thread part and the external thread part. The guide sleeve includes an upper cavity located above the first connecting member. The electric valve includes a lower cavity located inside the valve body component and below the guide sleeve, and an outer cavity located between the outside of the guide sleeve and the valve body component. There is a first pressure balance hole communicating the outer cavity and the upper cavity between the outer cavity and the upper cavity, and a second pressure balance hole communicating the outer cavity and the lower cavity between the outer cavity and the lower cavity.

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