Electric valve

Abstract

An electric valve comprises a driving part, a transmission component, a valve core and a valve seat; the electric valve also comprises an upper cavity and a lower cavity, the transmission component is located in the upper cavity, and the lower cavity is formed on the valve seat; the driving part drives the transmission component to move, and the transmission part drives the valve core to move, and the valve core can move up and down along the axial direction; the valve core comprises a side wall part and a top part, and the valve core has a connecting hole, and the connecting hole connects the upper cavity and the valve core cavity; the valve core is subjected to the pulling force or thrust of the transmission component; the electric valve structure can be simplified, which is beneficial to reducing the product manufacturing cost.

Description

Technical Field

[0001] The invention relates to an electric valve. Background Art

[0002] Electric valves are used in heat pipe systems to cut off refrigerant or adjust flow rate; how to simplify the structure of electric valves and reduce product manufacturing costs. Summary of the invention

[0003] The purpose of the invention is to provide an electric valve to simplify the product structure and reduce the product manufacturing cost.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an electric valve, comprising a driving part, a transmission component, a valve core and a valve seat; the electric valve also has an upper cavity and a lower cavity, the transmission component is located in the upper cavity, and the lower cavity is formed on the valve seat; the driving part drives the transmission component to move, and the transmission part drives the valve core to move, and the valve core can move up and down along the axial direction; the valve seat has a valve port, a first port and a second port, the valve port is located between the first port and the second port, the first port is connected to the lower cavity, and the second port is connected to the lower cavity through the valve port; the valve core comprises a side wall part and a top part, the valve core has a valve core cavity, the side wall part and the top part surround the valve core cavity, the electric valve has a connecting hole, and the connecting hole connects the upper cavity and the valve core cavity; the valve core is subjected to the pulling force or thrust of the transmission component.

[0005] The electric valve of the present technical solution improves the connection method between the transmission component and the valve core so that the transmission component only applies a force in one direction to the valve core; the valve core is only subjected to a force in one direction applied by the screw. After the working medium is introduced, the valve core is subjected to a combined force opposite to the force and moves in the axial direction along with the transmission component to open or close the valve port, thereby realizing the function of regulating the flow rate, thereby simplifying the structure of the electric valve and helping to reduce product manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 is a schematic cross-sectional structure diagram of an embodiment of the electric valve of the present invention;

[0007] Figure 2 yes Figure 1 A schematic diagram of the structure of the electric valve without the stator component and the first connecting pipe and the second connecting pipe;

[0008] Figure 3 yes Figure 1 Force analysis diagram of the valve core when the electric valve takes the first port as the inlet end;

[0009] Figure 4 yes Figure 1Force analysis diagram of the valve core when the electric valve takes the second port as the inlet end;

[0010] Figure 5 is a cross-sectional structural schematic diagram of a second embodiment of the electric valve of the present invention;

[0011] Figure 6 yes Figure 5 A schematic diagram of the structure of the electric valve without the stator component and the first connecting pipe and the second connecting pipe;

[0012] Figure 7 yes Figure 5 Force analysis diagram of the valve core when the electric valve takes the second port as the inlet end;

[0013] Figure 8 yes Figure 5 Force analysis diagram of the valve core when the electric valve takes the first port as the inlet end;

[0014] Fig. 9 is a schematic cross-sectional structure diagram of a third embodiment of the electric valve of the present invention;

[0015] Fig.10 yes Fig. 9 A schematic diagram of the structure of the electric valve without the stator component and the first connecting pipe and the second connecting pipe;

[0016] Fig.11 yes Fig. 9 Force analysis diagram of the valve core when the electric valve takes the first port as the inlet end;

[0017] Fig.12 yes Fig. 9 Force analysis diagram of the valve core when the electric valve takes the second port as the inlet end;

[0018] Fig.13 is a schematic cross-sectional structure diagram of a fourth embodiment of the electric valve of the present invention;

[0019] Fig.14 yes Fig.13 A schematic diagram of the structure of the electric valve without the stator component and the first connecting pipe and the second connecting pipe;

[0020] Fig.15 yes Fig.13 Force analysis diagram of the valve core when the electric valve takes the first port as the inlet end;

[0021] Fig.16 yes Fig.13 Force analysis diagram of the valve core when the second port of the electric valve is used as the inlet end

[0022] Fig.17 It is a schematic diagram of the cross-sectional structure of the combined structure of the connecting seat and the valve seat. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0024] In a refrigeration system, a valve device needs to be installed on the refrigerant circuit to cut off or adjust the refrigerant flow. In order to improve the control accuracy of the flow, an electrically driven valve device is used, hereinafter referred to as an electric valve.

[0025] See also Figures 1 to 17 The electric valve 10 includes a driving part, a transmission component 3, a valve core 4 and a valve seat 5; in the present embodiment, the driving part includes a stator component 1 and a rotor component 2, and of course it can also be other driving structures, such as magnetic drive, etc. The electric valve 10 has an upper cavity 101 and a lower cavity 102, the transmission component 3 is located in the upper cavity 101, the valve seat 5 forms the lower cavity 102, and the stator component 1 is located on the periphery of the rotor component 2; the electric valve has a valve port 51, a first port 52 and a second port 53, the valve port 51 is located between the first port 52 and the second port 53, the first port 52 is connected to the lower cavity 102, and the second port 53 is connected to the lower cavity 102 through the valve port 51; in the present embodiment, the valve port 51, the first port 52 and the second port 53 are formed on the valve seat 5, and of course ... 52 and the second port 53 can also be formed with the valve seat separately, and then connected or communicated with the valve seat; the electric valve also includes a first connecting pipe 91 and a second connecting pipe 92, the first connecting pipe 91 is communicated with the first port 52, and the second connecting pipe 92 is communicated with the second port 53; the stator component 1 is energized according to a certain rule through the terminal 93 to generate an excitation magnetic field, the rotor component 2 rotates in the excitation magnetic field, the transmission component 3 converts the rotation of the rotor component into axial movement of the valve core, and the valve core moves relative to the valve port, so that the valve core closes or opens the valve port, thereby being able to cut off the refrigerant or adjust the flow rate.

[0026] In order to simplify the structure of the electric valve, the valve core is only subject to the force in one direction, upward or downward, exerted by the transmission component, and the other direction is not constrained by the force of the transmission component. This simplifies the connection structure between the valve core and the transmission component, which is conducive to reducing costs.

[0027] In the following embodiments, in one embodiment, the end of the transmission component 3 abuts against the outer side of the valve core 4, and the end of the transmission component 3 applies a downward thrust to the valve core 4, so that the transmission component 3 can move downward, and the transmission component 3 can push the valve core 4 to move downward. If the working medium is not introduced, the transmission component 3 moves upward, and the valve core 4 cannot move upward with the transmission component 3. In order to ensure that the valve core 4 moves upward, after the working medium is introduced, it is ensured that the resultant force of the working medium on the valve core 4 is upward; in another embodiment, the end of the transmission component 3 abuts against the inner side of the valve core 4, and the end of the transmission component 3 applies an upward pulling force to the valve core 4, and the transmission component 3 moves upward, and the transmission component 3 drives the valve core 4 to move upward. If the working medium is not introduced, the transmission component 3 moves downward, and the valve core 4 cannot move downward under the action of gravity and friction. In order to ensure that the valve core 4 moves downward, after the working medium is introduced, it is ensured that the resultant force of the working medium on the valve core 4 is downward.

[0028] The valve core 4 includes a side wall portion 41 and a top portion 42, which surround and form a valve core cavity 43; a connecting hole 421 is provided on the top portion 42, which connects the upper cavity 101 and the valve core cavity 43, so that the pressure of the upper cavity 101 and the valve core cavity 34 is balanced, that is, the pressure of the upper cavity is the same as that of the valve core cavity, the first being the first pressure P1; the valve core 4 also includes an abutment portion 43, the abutment portion 43 is matched with the valve port 51 and can close the valve port 51, and the abutment portion 43 is an inclined surface or an arc surface structure; the outer diameter of the abutment portion gradually increases from the free end of the abutment portion to the outer side of the side wall portion, and at least part of the abutment portion is located in the lower cavity.

[0029] In this embodiment, the electric valve further includes a connecting seat 50. In this embodiment, the connecting seat 50 and the valve seat 5 are integrally formed by furnace welding. Of course, the connecting seat 50 and the valve seat 5 can be made into an integral body. The diameters indicated below refer to the corresponding structure being circular. When the corresponding structure is non-circular, the corresponding diameter is the equivalent diameter.

[0030] Figures 1 to 4 It is a schematic diagram of an implementation method of an electric valve. In this embodiment, the electric valve 10 includes a stator component 1, a rotor component 2, a transmission component 3 and a valve core 4. The stator component 1 drives the rotor component 2 to rotate, and the rotor component 2 drives the transmission component 3 to make axial movement. When the transmission component 3 moves downward, it pushes the valve core 4 to close the valve port 51 downward. When the transmission component 3 moves upward, the valve core 4 is subjected to the upward combined force of the working medium and moves upward synchronously with the transmission component 3, gradually opening the valve port to adjust the flow through the valve port.

[0031] In this embodiment, the stator component 1 is located at the periphery of the rotor component 2 and is isolated by a cover body 6. The cover body 6 forms an upper cavity 101, and the rotor component 2 is located in the upper cavity 101; after power is turned on, an excitation magnetic field is formed around the stator component 1 to drive the rotor component 2 to rotate; the transmission component 3 includes a screw 31 and a nut 32; the screw 31 is fixedly connected to the rotor component 2, and an external thread is provided on the outer wall of the screw 31, which cooperates with the nut 32 through threads to convert the rotation of the rotor component 2 into axial up and down movement; the bottom end of the screw 31 can abut against the outer surface of the top 41 of the valve core 4, and when the screw 31 moves downward in the axial direction, it pushes the valve core 4 to move downward to close the valve port or reduce the opening of the valve port.

[0032] Combination Figure 1 , Figure 2 , Figure 3 as well as Figure 4 In this embodiment, the cross section of the side wall of the valve core 4 is annular, the outer edge diameter of the side wall 41 is a first diameter D1, the diameter of the valve port 51 is a second diameter D2, the first diameter D1 is greater than the second diameter D2, the valve core 4 and the valve port 51 are tightly matched, and the valve core 4 is connected to the valve port 51. Figure 2 and Figure 3 , when the valve core 4 and the valve port 51 are in close cooperation, the medium enters from the first port 52, and the lower cavity filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2; the first diameter D1 is larger than the second diameter D2, and the surface formed by this part is subjected to the first axial upward pressure F1 of the working medium, and the valve core is also subjected to the effect of its own gravity. In addition to the effect of the screw on the valve core, the combined force of the forces acting on the valve core is F1-G; when the combined force is upward, the electric valve works, and when the rotor component 2 drives the transmission component 3 to move axially upward, the valve core 4 is subjected to the combined force along the axial direction and upward, and the valve port is gradually opened as the transmission component 3 moves axially and upward. The first pressure To achieve the upward direction of F1-G and the valve opening, it is necessary to ensure that the first diameter D1 is larger than the second diameter D2. The area surrounded by the outer edge of the top is The flow area of ​​the valve port is

[0033] See also Figure 2 and Figure 4 In this embodiment, when the valve core 4 and the valve port 51 are tightly matched, the medium enters from the second port 53, the valve core 4 and the valve seat 51 are tightly matched, the valve core cavity 43 and the upper cavity are connected through the connecting hole 421, and the pressure in the two cavities is the first pressure P1; in addition to the action of the screw on the valve core, the combined force F 合 =F2-F3-G, where When the first diameter D1 is larger than the second diameter D2, the resultant force Ftotal of the forces acting on the valve core is downward, the valve core 4 as a whole is always acted upon by the resultant force axially downward, the valve core 4 is tightly matched with the valve seat 2, the valve port cannot be opened, and the valve opening can be prevented when the system is under reverse pressure. When the working medium is introduced through the second port 53, in order for the valve core to open the valve port, the resultant force Ftotal of the forces acting on the valve core should be upward, and at least the second diameter D2 should be larger than the first diameter D2.

[0034] Figures 5 to 8 It is a schematic diagram of another embodiment of the electric valve. Compared with the above embodiments, the main differences are: the side wall portion 41 includes a large diameter portion 411 and a small diameter portion 412, wherein the diameter of the small diameter portion is a first diameter D1, and the diameter of the large diameter portion is a third diameter D3, the first diameter D1 is smaller than the third diameter D3, and the side wall portion forms an annular step surface 44, and the step surface is located between the large diameter portion 411 and the small diameter portion 412. The step surface 44 can be in conflict with the bottom 514 of the connecting seat 50, and can limit the valve core 3 from continuing to move upward; the first diameter D1 is smaller than the second diameter D2.

[0035] See also Figure 6 and Figure 7 In this embodiment, the working medium enters from the first port 52, the valve core 4 is tightly matched with the valve port 51, and the lower cavity part filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2; the third diameter D3 is larger than the second diameter D2, and the surface formed by this part is subjected to the first axial upward pressure F1 of the working medium. The third diameter D3 is larger than the first diameter D1, and is subjected to the fourth downward pressure F4 at the step surface. The valve core is also subjected to the effect of its own gravity. In addition to the effect of the screw on the valve core, the combined force F 合 F1-F4-G, among which Since the first diameter D1 is smaller than the second diameter D2, the resultant force F acting on the valve core is 合 Because the combined force is axially downward, the valve core 4 always keeps a close fit with the valve seat 5 to prevent the valve from opening when the system is under reverse pressure.

[0036] See also Figure 6 and Figure 8 In this embodiment, the working medium enters from the second port 53, the valve core 4 is tightly matched with the valve port 51, the valve core cavity is connected with the upper cavity through the connecting hole 421, and the pressure in the two cavities is the first pressure P1; because the first diameter D1 is greater than the fourth diameter D4, the valve core 4 is subjected to the third axial downward force F3, Since the second diameter D2 is larger than the fourth diameter D4, the valve core 4 is subjected to a second axial upward force F2. In addition to the effect of the screw on the valve core, the combined force F 合is F2-F3-G, Since the second diameter D2 is larger than the first diameter D1, when the weight is small and negligible, the valve core 4 is subjected to an axial upward force as a whole. When the rotor component 2 drives the transmission component 3 to move axially upward, the valve core 4 is subjected to an axial and upward force and gradually opens the valve port as the transmission component 3 moves axially and upward, thereby realizing flow regulation.

[0037] In the above two embodiments, one port entering the working medium can open the valve port, and the other port entering the working medium makes the electric valve in a fully closed state. Connecting the electric valve to the system can prevent the valve from opening when the system is under reverse pressure.

[0038] Figures 9 to 12 It is a schematic diagram of the third embodiment of the electric valve. Compared with the second embodiment, the main difference is that: the top 42 of the valve core 4 has a through hole that can accommodate the screw 31 to pass through. In this embodiment, the through hole and the connecting hole can be the same hole, that is, the through hole can be a connecting hole; the lower end of the screw 31 has a flange portion 311, the screw 31 passes through the through hole from the inside of the valve core 4, and the flange portion abuts against the inner side surface of the top 42. When the transmission component 3 moves axially upward, the valve core 5 is pulled gradually away from the valve port; the side wall portion 41 includes a large diameter portion 411 and a small diameter portion 412, wherein the diameter of the small diameter portion is the first diameter D1, and the diameter of the large diameter portion is the third diameter D3, the first diameter D1 is smaller than the third diameter D3, and the side wall portion forms an annular step surface 44, the step surface is located between the large diameter portion and the small diameter portion, and the step surface 44 can abut against the bottom 514 of the connecting seat, and can limit the valve core 3 from continuing to move upward; the first diameter D1 is smaller than the second diameter D2. The screw rod 31 further includes a guide portion, which is located on the upper side of the flange portion. The guide portion cooperates with the top clearance forming the through hole. The guide portion extends into the valve core cavity and the extending direction is parallel to the side wall portion of the valve core.

[0039] See also Fig.10 and Fig.11 In this embodiment, the valve core 4 is tightly matched with the valve port 51, and the lower cavity part filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2; the third diameter D3 is larger than the second diameter D2, and the surface formed by this part is subjected to the first axial upward pressure F1 of the working medium. The third diameter D3 is larger than the first diameter D1, and is subjected to the fourth downward pressure F4 at the step surface. The valve core is also subjected to the effect of its own gravity. In addition to the effect of the screw on the valve core, the combined force F 合 F1-F4-G, among which Since the first diameter D1 is smaller than the second diameter D2, the resultant force F acting on the valve core is 合It is a resultant force in the axial downward direction; when the stator component 1 drives the rotor component 2 to rotate, and the rotor component 2 drives the transmission component 3 to move axially upward, the screw 31 pulls the valve core 4 to open the valve port upward; when the rotor component 2 drives the transmission component 3 to move axially downward, the valve core 4 is acted upon by the resultant force in the axial direction and downward direction, and gradually closes the valve port as the transmission component 3 moves axially and downward, thereby realizing flow regulation.

[0040] See also Fig.10 and Fig.12 In this embodiment, the working medium enters from the second port 53, the valve core 4 is tightly matched with the valve port 51, the valve core cavity is connected with the upper cavity through the connecting hole 421, and the pressure in the two cavities is the first pressure P1; because the first diameter D1 is greater than the fourth diameter D4, the valve core 4 is subjected to the third axial downward force F3, Since the second diameter D2 is larger than the fourth diameter D4, the valve core 4 is subjected to a second axial upward force F2. In addition to the effect of the screw on the valve core, the combined force F 合 is F2-F3-G, Since the second diameter D1 is larger than the first diameter D2, when the weight is small and negligible, the valve core 4 is subjected to the axial upward force as a whole, and no transmission parts are required to operate. The valve core leaves the valve port, realizing the normally open mode of the valve port.

[0041] Figures 13 to 16 It is a schematic diagram of the fourth embodiment of the electric valve. The main differences compared with the third embodiment are: the first diameter D1 is equal to the third diameter D3, there is no step surface 44, the top 42 of the valve core 4 has a through hole that can accommodate the screw 31, and the lower end of the screw 31 has a flange portion. The screw 31 passes through the through hole from the inside of the valve core 4, and the flange portion abuts against the inner side surface of the top. When the transmission component 3 moves axially upward, it pulls the valve core 5 gradually away from the valve port to achieve full opening with a large flow rate.

[0042] See also Fig.14 and Fig.16 In this embodiment, when the valve core 4 and the valve port 51 are tightly matched, the medium enters from the second port 53, the valve core 4 and the valve seat 51 are tightly matched, the valve core cavity 43 and the upper cavity are connected through the connecting hole 421, and the pressure in the two cavities is the first pressure P1; in addition to the action of the screw on the valve core, the combined force F 合 =F2-F3-G, where F2 = P1*(π When the first diameter D1 is greater than the second diameter D2, the resultant force F acting on the valve core 合Downward, the valve core 4 as a whole is always subjected to the axial downward combined force, the valve core 4 is tightly matched with the valve seat 2, and the stator component 1 drives the rotor component 2 to rotate. When the transmission component 3 moves axially upward, the screw 31 pulls the valve core 4 to open the valve port upward; when the rotor component 2 drives the transmission component 3 to move axially downward, the valve core 4 is subjected to the axial and downward combined force and gradually closes the valve port as the transmission component 3 moves axially and downward, thereby realizing flow regulation.

[0043] See also Fig.14 and Fig.15 In this embodiment, when the valve core 4 and the valve port 51 are in close cooperation, the medium enters from the first port 52, and the lower cavity part filled with the working medium is defined as the valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2; the first diameter D1 is larger than the second diameter D2, and the surface formed by this part is subjected to the first axial upward pressure F1 of the working medium, and the valve core is also subjected to the effect of its own gravity. In addition to the effect of the screw on the valve core, the combined force of the forces acting on the valve core is F1-G; when the combined force is upward, the electric valve works, and when the rotor component 2 drives the transmission component 3 to move axially upward, the valve core 4 is subjected to the combined force along the axial direction and upward, and the valve port is gradually opened as the transmission component 3 moves axially and upward. The first pressure To realize that the direction of F1-G is upward and the valve port can be opened, it is necessary to ensure that the first diameter D1 is larger than the second diameter D2. After the valve port in this technical solution is opened, the valve core cannot be closed, and the electric valve is in a normally open state.

[0044] like Fig.17 In this embodiment, the valve seat 5 is fixedly connected to the connecting seat 50 by welding, and the connecting seat 50 includes a first step surface 511, a second step surface 512, a third step surface 513 and a bottom surface 514; the first step 511 is fixedly connected to the cover body 6 by welding; the second step surface 512 abuts against the bottom surface of the cover body 6; a sealing member 8 is provided at the connection between the cover body 6 and the connecting seat 50, and the sealing member 8 is located on the third step surface 513 to prevent the working medium from leaking.

[0045] The electric valve includes an upper dead point, which limits the valve core 4 from continuing to move upward. When the valve core moves away from the valve port and moves upward to the upper dead point, the step surface 44 can abut against the upper dead point. The electric valve also includes a connecting seat 51, which is fixedly connected to the valve seat 5. The connecting seat 51 forms a guide hole 501, and the small diameter portion extends into the guide hole. The upper dead point is located at the bottom 514 of the connecting seat. The electric valve also includes a cover body 6 and a connecting cover 7. Part of the cover body 6 is located between the rotor component and the stator component, and the cover body 6 forms an upper cavity; the connecting cover 7 is located at the end of the cover body 6 and is fixedly connected to the cover body 6, and the connecting cover 7 is fixedly connected to the nut.

[0046] It should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail in this specification with reference to the above embodiments, it should be understood by those skilled in the art that the present invention can still be modified or replaced by equivalents, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An electric valve, comprising a driving part, a transmission component, a valve core and a valve seat; the electric valve further comprises an upper cavity and a lower cavity, the transmission component is located in the upper cavity, and the lower cavity is formed on the valve seat; the driving part drives the transmission component to move, and the transmission part drives the valve core to move, and the valve core can move up and down along the axial direction; the electric valve comprises a valve port, a first port and a second port, the valve port is located between the first port and the second port, the first port is communicated with the lower cavity, and the second port is communicated with the lower cavity through the valve port; characterized in that: The valve core includes a side wall portion and a top portion, the valve core has a valve core cavity, the side wall portion and the top portion surround the valve core cavity, the valve core has a connecting hole, the connecting hole connects the upper cavity body and the valve core cavity; the transmission component includes a screw rod, the end of the screw rod has a flange portion, a through hole is formed on the top portion, part of the screw rod is located in the through hole, the flange portion is located on the inner side of the top portion of the valve core, the outer diameter of the flange is larger than the diameter of the through hole, and the valve core is subjected to the pulling force of the transmission component.

2. The electric valve according to claim 1, characterized in that: The valve core is pulled upward by the transmission component, and when the area surrounded by the outer edge of the top is smaller than the flow area of ​​the valve port, the valve core can open and close the valve port with the first port as the inlet end, and the valve core is away from the valve port with the second port as the inlet end, and the electric valve is a normally open valve.

3. The electric valve according to claim 1, characterized in that: The valve core is pulled upward by the transmission component. When the area surrounded by the outer edge of the top is larger than the flow area of ​​the valve port, the valve core can open and close the valve port with the second port as the inlet end. With the first port as the inlet end, the valve core is away from the valve port, and the electric valve is a normally open valve.

4. The electric valve according to claim 2 or 3, characterized in that: The driving part includes a stator component and a rotor component, the transmission component includes a nut; the screw is fixedly connected to the rotor component; the outer wall of the screw has an external thread; the nut has an internal thread, and the screw is connected to the nut through threads.

5. The electric valve according to claim 4, characterized in that: The screw rod further comprises a guide portion, which is located on the upper side of the flange portion, the guide portion cooperates with the top clearance forming the through hole, and the guide portion extends into the valve core cavity and the extension direction is parallel to the side wall portion of the valve core.

6. The electric valve according to claim 5, characterized in that: The side wall portion includes a small diameter portion, a large diameter portion and an abutting portion, the abutting portion abuts against the valve seat corresponding to the valve port, the outer edge of the small diameter portion is aligned with the outer edge of the top portion, the outer diameter of the large diameter portion is larger than the outer diameter of the small diameter portion, a step surface is formed between the large diameter portion and the small diameter portion, the large diameter portion is located between the abutting portion and the step surface, and the small diameter portion is located between the top portion and the step surface; the electric valve includes an upper dead point, the upper dead point limits the valve core from continuing to move upward, and when the valve core moves away from the valve port and upward to the upper dead point, the step surface can abut against the upper dead point.

7. The electric valve according to claim 6, characterized in that: The electric valve further comprises a connecting seat, the connecting seat is fixedly connected to the valve seat, a guide hole is formed in the connecting seat, the small diameter portion extends into the guide hole, and the upper dead point is located at the bottom of the connecting seat.

8. The electric valve according to any one of claims 6 to 7, characterized in that: The electric valve also includes a cover body and a connecting cover. Part of the cover body is located between the rotor component and the stator component, and the cover body forms the upper cavity. The connecting cover is located at the end of the cover body and is fixedly connected to the cover body, and the connecting cover is fixedly connected to the nut.

9. The electric valve according to claim 8, characterized in that: The abutting portion is an inclined surface or an arc surface structure; the outer diameter of the abutting portion gradually increases from the free end of the abutting portion to the large diameter portion, and at least part of the abutting portion is located in the lower cavity.

10. The electric valve according to claim 9, characterized in that: The outer circumferential surface of the small diameter portion and the outer circumferential surface of the large diameter portion are both cylindrical, the diameter of the small diameter portion is smaller than the diameter of the large diameter portion, the valve port is circular, and the abutment portion is matched with the valve port.

11. The electric valve according to claim 9, characterized in that: The cross-sections corresponding to the outer circumference of the small diameter portion and the outer circumference of the large diameter portion are both rectangular, the equivalent diameter of the small diameter portion is smaller than the equivalent diameter of the large diameter portion, the valve port is rectangular, and the abutment portion matches the valve port.

Images