electric valve

Abstract

An electric valve includes a valve body, which includes a valve seat assembly and a fixed gear. The fixed gear includes a fixed gear body and a fixed gear connecting part, which are integrally formed and fixedly connected to the valve seat assembly. The valve seat assembly includes an inlet portion, which includes a valve inlet port. The fixed gear also includes a fixed gear stop portion. Along the axial direction of the valve body, the projection of the fixed gear stop portion toward the valve seat assembly at least partially covers the valve inlet port. The impact force of the fluid medium is at least partially absorbed by the fixed gear stop portion, which reduces the impact of the fluid medium on the gear. Compared to the direct impact of the fluid medium on the gear electric valve, the electric valve provided by this solution has higher stability.

Description

[Technical Field]

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

[0002] Electric valves are mainly used in refrigeration systems. In an electric valve that includes a gear mechanism, the stator coil of the electric valve is connected to a drive controller. After the drive controller is energized, it sends a pulse drive signal to the stator coil. The stator coil generates a changing magnetic field, which causes the rotor of the electric valve to rotate. The rotor can drive the valve block to rotate relative to the valve seat through the gear mechanism, thereby realizing refrigerant flow control or refrigerant path switching. [Summary of the Invention]

[0003] The purpose of this invention is to provide an electric valve that has relatively high stability.

[0004] To achieve the above objectives, the following technical solution is adopted:

[0005] An electric valve includes a valve body, the valve body including a valve seat assembly and a fixed gear, the fixed gear including a fixed gear body and a fixed gear connecting part, the fixed gear body and the fixed gear connecting part being an integral structure, and the fixed gear connecting part being fixedly connected to the valve seat assembly;

[0006] The valve seat assembly includes an inlet portion, which includes a valve inlet port. The fixed gear also includes a fixed gear stop portion. Along the axial direction of the valve body, the projection of the fixed gear stop portion toward the valve seat assembly at least partially covers the valve inlet port portion.

[0007] The electric valve provided by this solution allows some of the fluid medium flowing into the electric valve from the inlet to impact the fixed gear stop. Therefore, at least part of the impact force of the fluid medium is absorbed by the fixed gear stop, which can reduce the impact of the fluid medium on the gear. Compared with the electric valve where the fluid medium directly impacts the gear, the electric valve provided by this solution has higher stability. [Attached Image Description]

[0008] Figure 1 This is a cross-sectional schematic diagram of one embodiment of the present invention;

[0009] Figure 2 for Figure 1 Cross-sectional schematic diagram of the sun gear component;

[0010] Figure 3 for Figure 1 Schematic diagram of the middle valve seat assembly;

[0011] Figure 4 for Figure 1Top view of the middle valve seat assembly;

[0012] Figure 5 for Figure 1 A schematic diagram of the inverted fixed gear in the middle;

[0013] Figure 6 for Figure 1 Schematic diagram of the structure of the planetary gear assembly;

[0014] Figure 7 for Figure 1 Exploded view of the planetary gear assembly;

[0015] Figure 8 for Figure 5 A schematic diagram of the inverted planetary carrier structure;

[0016] Figure 9 for Figure 1 A schematic diagram of the inverted valve block.

[0017] Figure 10 for Figure 1 Bottom view of the middle valve block;

[0018] Figure 11 This is a schematic diagram showing the positional relationship between the valve block and the valve seat assembly when the electric valve is in the fully closed state.

[0019] Figure 12 This is a schematic diagram showing the positional relationship between the valve block and the valve seat assembly when the electric valve is in the intermediate state of flow regulation.

[0020] Figure 13 This is a schematic diagram showing the positional relationship between the valve block and the valve seat assembly when the electric valve is in the fully open state.

[0021] Figure 14 This is a cross-sectional schematic diagram of a second embodiment of the electric valve provided by the present invention;

[0022] Figure 15 for Figure 14 Schematic diagram of the middle valve seat assembly;

[0023] Figure 16 for Figure 14 Top view of the middle valve seat assembly;

[0024] Figure 17 This is a cross-sectional schematic diagram of the third embodiment of the electric valve provided by the present invention.

[0025] The above figures include the following reference numerals:

[0026] 1. Valve body; 11. Valve seat assembly; 111. Valve seat; 1111. Valve seat bore; 112. Inlet; 1121. Valve inlet port; 113. Outlet; 1131. Valve outlet port; 114. First connecting pipe; 115. Second connecting pipe; 116. Mating surface; 117. Flow regulating section; 117a. First curve; 117b. Second curve; 118. Stepped section; 1181. Stepped transverse section; 1182. 119. Stepped longitudinal section; 120. Valve seat positioning hole section; 13. Valve seat positioning section; 14. Rotor; 15. Sun gear assembly; 16. Through hole; 17. Sun gear section; 18. Sun gear large diameter section; 19. Sun gear small diameter section; 10. Sun gear pressing section; 11. Housing assembly; 12. First housing assembly; 13. First top wall section; 14. First side wall section; 15. Second housing assembly 1521. Second top wall portion; 1522. Second side wall portion; 16. Bushing; 17. Spring; 18. Planetary gear assembly; 181. Planetary carrier; 1811. Support column; 1812. Planetary carrier base plate; 1813. Planetary carrier stop portion; 1814. Planetary carrier limiting portion; 1815. Base plate protrusion; 182. Cover plate; 183. Planetary gear; 184. Planetary gear shaft; 19. Fixed gear; 191. 192. Fixed gear main body; 193. Fixed gear connecting part; 194. Fixed gear stop part; 195. Covering surface; 196. Fixed gear positioning part; 197. Fixed gear positioning hole part; 20. Valve block; 201. Valve block through hole part; 202. Valve block mating hole part; 203. Flow control part; 2031. Fitting surface part; 2032. Notch part; 1A. Positioning protrusion part; 1B. Positioning hole part; A. Valve cavity;

Detailed Implementation Methods

[0027] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to the following for details. Figure 1 , Figure 1 This is a cross-sectional schematic diagram of one embodiment of the present invention. For example... Figure 1 As shown, the electric valve provided in this embodiment includes a valve body 1 and a stator coil (not shown in the figure). The valve body 1 includes a valve seat assembly 11, a rotor 12, and a valve shaft 14. The stator coil of the electric valve is connected to a drive controller. After the drive controller is energized, it sends a pulse drive signal to the stator coil, which generates a periodically changing magnetic field, thereby driving the rotor 12 of the electric valve to rotate in the forward or reverse direction.

[0029] Please refer to the following for details. Figure 2 , Figure 2 for Figure 1A cross-sectional view of the sun gear component. The rotor 12 is connected to the sun gear component 13, so that when the rotor 12 rotates, it can drive the sun gear component 13 to rotate synchronously. In this embodiment, the rotor 12 and the sun gear component 13 are fixedly connected. Of course, they can also be set as a limiting connection, as long as the rotor 12 can drive the sun gear component 13 to rotate together. The sun gear component 13 is provided with a through hole 131 passing through its center. The valve shaft 14 passes through the through hole 131, and the sun gear component 13 can rotate around the valve shaft 14. One end of the valve shaft 14 is fixedly connected to the valve seat assembly 11, and the other end is connected to the bushing 16 (mentioned below) provided on the top of the valve body 1 or directly to the housing 15. In this way, the valve shaft 14 can provide good concentricity for the rotation of the rotor 12 and the sun gear component 13.

[0030] The electric valve includes a housing component 15. In this embodiment, the housing component 15 includes a first housing component 151 and a second housing component 152. The first housing component 151 is generally a sleeve-shaped part with one open end and may be made of stainless steel. It has a first top wall portion 1511 and a first side wall portion 1512. The first top wall portion 1511 is generally the top portion of the first housing component 151, and the first side wall portion 1512 is generally the side portion of the first housing component 151. The second housing component 152 is generally a sleeve-shaped part with both open ends and may also be made of stainless steel. It has a second top wall portion 1521 and a second side wall portion 1522. The second top wall portion 1521 is generally the top portion of the second housing component 152, and the second side wall portion 1522 is generally the side portion of the second housing component 152. The diameter of the second sidewall portion 1522 of the second housing component 152 is larger than the diameter of the first sidewall portion 1512 of the first housing component 151. This allows the lower end of the first housing component 151 to be fitted and fixed to the second top wall portion 1521 of the second housing component 152, for example, by welding. The lower edge of the second sidewall portion 1522 of the second housing component 152 is then fixedly connected to the valve seat assembly 11, for example, by welding. Of course, [the following text is incomplete and requires further context]. Figure 1As a specific implementation, a specific structure and connection method of the first housing component 151 and the second housing component 152 are shown. Those skilled in the art can also make certain modifications. For example, the second housing component 152 can be a sleeve with open ends and equal diameter, without a second top wall portion 1521, and a bottom wall portion extending radially outward at the bottom of the first housing component 151, which is then fixedly connected to the second housing component 152. This can also achieve the above connection relationship. Alternatively, the first housing component 151 and the second housing component 152 can no longer be distinguished, but can be made into a single integral housing component 15, such as by stamping a metal sheet in one piece, simultaneously forming the first side wall portion 1512, the second side wall portion 1522, the first top wall portion 1511, and the second top wall portion 1521. This can also achieve the purpose of the present invention. The method of connecting the first housing component 151 and the second housing component 152 in this embodiment is only a specific implementation means and should not be construed as a limitation on the scope of protection.

[0031] The electric valve provided in this embodiment also includes a bushing 16, which can be made of polymer materials such as rubber. The bushing 16 is disposed inside the first housing component 151 of the housing component 15. The bushing 16 can be fitted with the first housing component 151 by clearance fit, transition fit, or interference fit. A through hole or blind hole is provided at approximately the center position of the bushing 16, and one end of the valve shaft 14 passes through the through hole or blind hole, so that at least a portion of the end of the valve shaft 14 that is relatively far away from the valve seat 111 is located in the through hole or blind hole, so that the axis of the valve shaft 14 is approximately coincident with the axis of the valve body 1. The valve shaft 14 and the through hole or blind hole can also be fitted by clearance fit, transition fit, or interference fit. The bushing 16 can provide good concentricity for the rotation of the rotor 12 and the sun gear component 13, reduce the occurrence of the valve shaft 14 offset from the axis of the valve body 1, and increase the working stability and service life of the electric valve. In this embodiment, the valve shaft 14 is approximately located at the axis of the electric valve.

[0032] Furthermore, a spring 17 is provided between the bushing 16 and the sun gear component 13. One end of the spring 17 abuts against the bushing 16, and the other end of the spring 17 abuts against the rotor 12. At this time, since the rotor 12 is fixedly connected or limitedly connected to the sun gear component 13, the spring 17 can apply a certain elastic force to the sun gear component 13 through the rotor 12. The direction of this elastic force is roughly vertically downward along the axis of the valve body 1. This arrangement can constrain the sun gear component 13 from excessive upward displacement. More specifically, the lower end of the sun gear component 13 is provided with a sun gear pressing part 133. The sun gear pressing part 133 is roughly a structure that extends downward along the circumferential direction of the gear of the sun gear component 13. Through the sun gear pressing part 133 abutting against the valve block 20 (mentioned below), the valve block 20 will be subjected to the elastic load of the spring 17, so that the valve block 20 fits against the mating surface 116 of the valve seat assembly 11.

[0033] It should be noted that in this embodiment, with the connection between the sun gear component 13 and the rotor 12, the lower end of the spring 17 abuts against the rotor 12. However, since the sun gear component 13 and the rotor 12 are connected by a fixed connection or a limiting connection, they can be considered as a single component. Therefore, there are multiple possible combinations in terms of structure. Thus, it is also possible to configure the lower end of the spring 17 to abut against the sun gear component 13.

[0034] Within the valve cavity A, which is roughly enclosed by the first housing component 151, the second housing component 152, and the valve seat assembly 11, a planetary gear assembly 18, a fixed gear 19, and a valve block 20 are also provided. Its main working principle is as follows: the rotation of the rotor 12 and the sun gear component 13 drives the planetary gears 183 of the planetary gear assembly 18 to rotate. Simultaneously, the planetary gears 183 rotate, causing the valve block 20 to rotate, thereby changing the position of the valve block 20 relative to the valve seat assembly 11, thus achieving flow control. The structure and connection or mating relationships of the valve seat assembly 11, the planetary gear assembly 18, the fixed gear 19, and the valve block 20 will be described below.

[0035] The electric valve provided in this solution uses a planetary gear reduction system, which, compared to capillary throttling, enables more precise regulation of the refrigerant flow in refrigeration systems such as refrigerators.

[0036] Please refer to Figure 3-4 ,in, Figure 3 This is a schematic diagram of the structure of the valve seat assembly 11 provided in this embodiment. Figure 4This is a top view of the valve seat assembly 11 provided in this embodiment. The valve seat assembly 11 provided in this embodiment includes a valve seat 111, a first connecting pipe 114, and a second connecting pipe 115; the valve seat 111, the first connecting pipe 114, and the second connecting pipe 115 are fixedly assembled. The first connecting pipe 114 and the second connecting pipe 115 serve as the inlet and outlet pipes for the fluid medium of the electric valve, respectively, and are generally used to connect to the system piping in refrigeration and heating systems such as refrigerators, freezers, and air conditioners.

[0037] The valve seat 111 is generally plate-shaped and has a valve seat hole 1111 located approximately at its center. In this embodiment, the valve seat hole 1111 is a blind hole, meaning it does not penetrate the valve seat 1111. Of course, the valve seat hole 1111 can also be a through hole. During assembly, one end of the valve shaft 14 is inserted into the valve seat hole 1111 and fixed in place.

[0038] The valve seat assembly 11 is also provided with an inlet 112 and an outlet 113. Both the inlet 112 and the outlet 113 are through holes that penetrate the upper and lower surfaces of the valve seat 111. The first connecting pipe 114 is fixedly connected to the valve seat 111 through the inlet 112, and the second connecting pipe 115 is fixedly connected to the valve seat 111 through the outlet 113. In addition, the inlet 112 is also provided with a valve inlet 1121, which is the valve port of the inlet 112 that is relatively close to the planetary gear assembly 18. The outlet 113 is also provided with a valve outlet 1131, which is the valve port of the outlet 113 that is relatively close to the planetary gear assembly 18.

[0039] A mating surface 116 is provided on the side of the valve seat 111 that is relatively close to the planetary gear assembly 18, and the valve seat assembly 11 is provided with a flow regulating part 117 formed by recessing along the axial direction of the mating surface 116. Of course, the flow regulating part 117 can also be machined separately and then fixedly connected to the valve seat 1111. The flow regulating part 117 is generally in the shape of a narrow arc groove, and the edge line of the flow regulating part 117 is defined by a first curve 117a and a second curve 117b. The first curve 117a and the second curve 117b can be arcs. The first curve 117a is located outside the circumference of the second curve 117b (with the valve seat hole 1111 as the center), and the flow regulating part 117 is connected to the valve outlet 1121. Furthermore, the distance between the first curve 117a and the second curve 117b gradually increases along the direction closer to the outlet 113. In this way, the overall size of the flow regulating unit 117 is relatively small, making it particularly suitable for precise regulation of small flow rates compared to ordinary flow regulating valves that use needle valve structures, such as refrigerant flow regulation in refrigerator refrigeration systems.

[0040] Furthermore, the depth of the flow regulating section 117 can be set so that the depth of the end of the flow regulating section 117 away from the outlet valve 1131 gradually increases towards the end closer to the outlet valve 1131.

[0041] In actual operation, the width and depth of the flow adjustment unit 117 can be set simultaneously according to the system flow requirements to meet different needs.

[0042] Please refer to Figure 5 , Figure 5 This is a schematic diagram of the structure of the fixed gear 19 inverted according to this embodiment of the invention. The fixed gear 19 is generally cylindrical and includes a fixed gear body 191 and a fixed gear connecting part 192. The fixed gear body 191 and the fixed gear connecting part 192 are an integral structure, that is, the fixed gear body 191 and the fixed gear connecting part 192 are a single integral structure in the actual product and cannot be separated from each other. Specifically, the fixed gear connecting part 192 can be made of metal (e.g., stainless steel). During the manufacturing process of the fixed gear 19, the fixed gear connecting part 192 can be used as an insert and integrally injection molded with the fixed gear body 191, or the fixed gear body 191 can be integrally molded with the fixed gear body using powder metallurgy or other methods. The fixed gear part 1912 is used to mesh with the planetary gear 183 of the planetary gear assembly 18 described below.

[0043] In addition, the fixed gear 19 provided in this embodiment also includes a fixed gear stop 193, which is located approximately axially below the fixed gear body 191. The fixed gear stop 193 can be integrally injection molded with the fixed gear body 191.

[0044] Please refer to Figure 2 To further ensure the stability and connection strength when the fixed gear 19 is connected to the valve seat assembly 11, the valve seat assembly 11 is also provided with a step portion 118 distributed circumferentially. The step portion 118 includes a step horizontal portion 1181 and a step vertical portion 1182. The step horizontal portion 1181 is distributed in a generally horizontal direction, and the step vertical portion 1182 is distributed in a generally vertical direction. The step horizontal portion 1181 is generally located on the circumferential outer edge of the step vertical portion 1182. At this time, the step portion 118 is generally in the form of a step that is set in the positive direction.

[0045] When the housing component 15 and the valve seat assembly 11 are fixedly connected, the second side wall portion 1522 can be inserted along the longitudinal portion 1182 of the step until the lower end of the second side wall portion 1522 abuts against the transverse portion 1181 of the step. Then the valve seat assembly 11 and the component 15 are fixedly connected by welding. At this time, the projections of the second side wall portion 1522 and the longitudinal portion 1182 of the step along the axis of the electric valve overlap.

[0046] At this time, the inner diameter of the second housing sidewall portion 1522 is not less than the diameter of the step longitudinal portion 1182, and the inner diameter of the second housing sidewall portion 1522 is less than the outer diameter of the step transverse portion 1181.

[0047] The step portion 118 serves as a guide and limiter, ensuring a more reliable connection between the valve seat assembly 11 and the fixed gear 19. It also improves the coaxiality between the axis of the valve seat assembly 11 and the axis of the fixed gear 19, resulting in smoother relative movement between the gears inside the valve body 1.

[0048] Furthermore, the fixed gear connecting part 192 is generally hollow cylindrical, and its lower edge is lower than the axial lower end of the fixed gear stop part 193. That is, there is an axial distance between the fixed gear stop part 193 and the end of the fixed gear connecting part 192 near the valve seat 111. At this time, at least part of the lower end of the fixed gear connecting part 192 is sleeved on the stepped longitudinal part 1182 of the stepped part 118, and then the valve seat assembly 11 is fixedly connected to the fixed gear 19.

[0049] Please refer to the following for details. Figure 1-2 During the process of fixing the valve seat assembly 11 and the fixed gear 19, the fixed gear connecting part 192 is sleeved on the step longitudinal part 1182. The step longitudinal part 1182 can provide guidance for the fixed gear 19. In addition, when the fixed gear connecting part 192 abuts against the step transverse part 1181, the fixed gear connecting part 192 cannot continue to move downward relative to the valve seat assembly 11. The step transverse part 1181 can limit the fixed gear 19. Afterwards, the valve seat assembly 11 and the fixed gear 19 can be fixedly connected by welding or pressing. The fixed gear 19 provided in this embodiment is fixed to the valve seat assembly 11 structure, and one end of it is fixedly connected to the valve seat assembly 11, making the assembly relatively simple.

[0050] Please refer to Figure 6-8 , Figure 6 This is a schematic diagram of the planetary gear assembly 18 provided in this embodiment. Figure 7 This is an exploded view of the planetary gear assembly 18 provided in this embodiment. Figure 8This is a schematic diagram of the planetary carrier inverted configuration according to this embodiment. The planetary gear assembly 18 includes a planetary carrier 181, a cover plate 182, and planetary gears 183. The planetary carrier 181 includes a planetary carrier base plate 1812 and three support columns 1811 extending upward from the planetary carrier base plate 1812. It should be noted that this embodiment exemplifies a structure with three planetary gears. In reality, the structure of the planetary gears can be configured according to the output torque requirements and is not limited to three planetary gears. In this embodiment, the number of support columns 1811 is also three, evenly distributed along the circumferential direction, and the three planetary gears 183 are disposed between two adjacent support columns 1811.

[0051] The planetary carrier 181 and the cover plate 182 are fixedly connected to limit the axial movement of the planetary gear 183. Specifically, a small hole can be provided in the cover plate 182. After one end of the support column 1811 extends out of the small hole in the cover plate 182, it is pressed and deformed to achieve a fixed connection. The planetary carrier 181 can be made of plastic injection molding, and the cover plate 182 can be made of metal sheet stamping. This allows for easy heating and deformation of the end 18111 to prevent the cover plate from detaching from the planetary carrier. Three planetary gears 183 have through holes passing through the planetary gear shaft 184 and are respectively mounted on the planetary carrier 181 via the planetary gear shaft 184. The planetary gears 183 can rotate around the planetary gear shaft 184. One end of the planetary gear shaft 184 is fixedly connected to the planetary carrier base plate 1812 or integrally formed, and the other end is fixedly connected to the cover plate 182. Specifically, the end of the planetary gear shaft 184 near the cover plate 182 can also be fixedly connected to the cover plate 182 by hot-melt riveting.

[0052] Taking one of the planetary gears 183 as an example, during assembly, the sun gear component 13 is inserted downwards from the center of the planetary gear assembly 18, causing the planetary gear 1831 to mesh with the sun gear component 13. This allows the rotor 12 to rotate, driving the planetary gear 183 to rotate. The inner and outer sides of the three planetary gears 183 define two virtual circles respectively. The gear located on the inner circumference of the planetary gear 1831 meshes with the sun gear component 13, while the gear located on the outer circumference of the planetary gear 1831 meshes with the fixed gear portion 1912 of the fixed gear 19. In this way, when the sun gear component 13 rotates, it can drive the planetary gears 183 to rotate synchronously. While rotating around the planetary gear shaft 184, the planetary gear 183 also rotates along the trajectory defined by the fixed gear body portion 1911 of the fixed gear 19. Thus, the electric valve drives the rotor 12 and the sun gear component 13 to rotate through the energized electromagnetic coil. After being decelerated by the planetary gear set 183, it ultimately drives the planet carrier 181 to rotate.

[0053] In addition, the planetary carrier 181 provided in this embodiment also includes a planetary carrier stop 1813, which is a structure that protrudes downward along the axial direction of the planetary carrier base plate 1812 toward the electric valve, that is, the planetary carrier stop 1813 protrudes from the lower surface of the planetary carrier base plate 1812.

[0054] The furthest distance between the planetary carrier stop 1813 and the axis of the valve shaft 14 is greater than the closest distance between the fixed gear stop 193 and the axis of the valve shaft 14 (i.e., the axis of rotation of the planetary gear assembly 18). The projections of the planetary carrier stop 1813 and the fixed gear stop 193 of the fixed gear 19 overlap along the axial center line of the valve body 1.

[0055] At this time, when the planetary carrier 181 rotates relative to the valve seat assembly 11, the planetary carrier stop 1813 and the fixed gear stop 193 of the fixed gear 19 limit the starting and ending positions of the planetary gear assembly 18. That is, if the planetary carrier 181 rotates clockwise to its limit position (the planetary carrier stop 1813 abuts against the fixed gear stop 193 of the fixed gear 19), the planetary carrier 181 cannot continue to rotate; if the planetary carrier 181 rotates counterclockwise to its limit position (the planetary carrier stop 1813 abuts against the fixed gear stop 193 of the fixed gear 19), the planetary carrier 181 cannot continue to rotate. Through the cooperation of the planetary carrier stop 1813 and the fixed gear stop 193 of the fixed gear 19, the rotational stroke and angle of the planetary carrier 181 are determined. It should be noted that the circumferential length of the planet carrier stop 1813 (specifically, the circumferential length of the part that abuts against the fixed gear stop 193) can be adjusted according to the needs of the system, thereby adjusting the rotation angle between the start position and the end position of the planet carrier 181.

[0056] Please refer to the following for details. Figure 9-10 , Figure 9 This is a schematic diagram of the valve block 20 when it is inverted, as provided in this embodiment. Figure 10This is a bottom view of the valve block 20 provided in this embodiment. The electric valve provided in this embodiment also includes a valve block 20, the axial projection of which can be generally circular. The valve block 20 includes a valve block through hole 201 located approximately at the center of the valve block, the valve block through hole 201 penetrating the upper and lower surfaces of the valve block 20, and the valve shaft 14 passing through the valve block through hole 201. In addition, the valve block 20 and the planetary carrier 181 can be connected by a fixed connection or a limiting connection. In this embodiment, the planetary carrier 181 is provided with a bottom plate protrusion 1815. The bottom plate protrusion 1815 is generally a structure in which the planetary carrier bottom plate 1812 protrudes downward in the axial direction of the electric valve. Correspondingly, the valve block 20 includes a valve block mating hole 202 that mates with the bottom plate protrusion 1815 of the planetary carrier 181. The valve block mating hole 202 can be in the form of a blind hole or a through hole. The bottom plate protrusion 1815 is at least partially located in the valve block mating hole 202, so that the planetary carrier 181 and the valve block 20 are fixedly connected or limitedly connected. When the planetary carrier 181 rotates, it can synchronously drive the valve block 20 to rotate synchronously.

[0057] A flow control unit 203 is provided at the bottom of the valve block 20, such as... Figure 7 As shown, the flow control unit 203 extends a certain height along its axial direction on the bottom surface of the valve block 20 (excluding the flow control unit 203 portion) to form a mating surface 2031 for contacting and rotating with the mating surface 116 of the valve seat assembly 11. The mating surface 2031 can abut against the mating surface 116 under the elastic load of the spring 17. At the same time, the flow control unit 203 is also provided with a notch 2032. The notch 2032 is a structure formed by partially recessing the mating surface 2031 towards the axial direction of the electric valve. In this way, when the valve block 20 abuts against the valve seat assembly 11, the flow control unit 203 located at the notch 2032 does not contact the mating surface 116 of the valve seat assembly 11. Thus, the fluid medium can flow from the space formed by the notch 2032 and the valve seat 111.

[0058] By fitting the flow control unit 203 to the mating surface 116 of the valve seat assembly 11, the notch 2032 of the flow control unit 203 corresponds to different circumferential positions of the flow regulating unit 117 of the valve seat assembly 11, thereby realizing the flow regulation function.

[0059] Of course, in addition to the planetary carrier 181 and valve block 20 being connected as two separate parts, the planetary carrier 181 and valve block 20 can also be integrally molded, that is, the planetary carrier 181 and valve block 20 are integrally injection molded.

[0060] The following is combined with Figure 11-13 This will illustrate the process of flow regulation. Among them, Figure 11 This is a schematic diagram showing the positional relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in the fully closed state. Figure 12 This is a schematic diagram showing the positional relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in the intermediate state of flow regulation. Figure 13 This is a schematic diagram showing the positional relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in the fully open state.

[0061] like Figure 11 As shown, the fixed gear stop 193 of the fixed gear 19 abuts against one side of the planetary carrier stop 1813. At this time, in Figure 11 In the projection diagram shown, the projections of the notch 2032 of the flow control unit 203, the flow regulating unit 117, and the outlet valve 1131 in the axial direction of the electric valve do not overlap. That is, the flow regulating unit 117 and the outlet valve 1131 are both covered by the contact surface 2031, so the fluid cannot flow out from the notch 2032. At this time, the electric valve is in the fully closed state.

[0062] like Figure 12 As shown, after the valve block 20 is rotated counterclockwise by a certain angle, the notch 2032 and the projection of the flow regulating part 117 in the axial direction of the electric valve partially overlap, i.e., region α in the figure. Region α is a part of the flow regulating part 117. At this time, fluid can flow into the valve chamber A of the electric valve through the space formed by the notch 2032, and then flow out from the valve outlet 1131. At this time, the position of the notch 2032 relative to the flow regulating part 117 determines the flow rate of the electric valve. Those skilled in the art will understand that... Figure 10 The diagram shows a specific position of the valve block 20. As the valve block 20 rotates continuously, the corresponding α region will gradually change, thereby causing the flow rate of the electric valve to change. This process is the flow rate regulation process of the electric valve.

[0063] like Figure 13 As shown, the planetary carrier 181 rotates counterclockwise until the planetary carrier stop 1813 abuts against the other side of the fixed gear stop 193, at which point the valve block 20 also stops rotating. At this time, the notch 2032 and the portion of the flow regulating part 117 near the outlet valve 1131, as well as the axial projection of the outlet valve 1131, form an overlapping area. That is, the outlet valve 1131 is entirely located in the position covered by the notch 2032. At this time, the fluid in the valve chamber A of the electric valve flows in from the space formed by the notch 2032 and flows out from the outlet valve 1131, as shown. Figure 13 As shown in region β, the electric valve is in the fully open state at this time.

[0064] Since the fixed gear 19 and the planetary gear assembly 18 mainly rely on the fixed gear stop 193 and the planetary carrier stop 1813 to define the starting and ending positions of the planetary gear assembly 18 relative to the valve seat assembly 11, the flow regulating part 117 of the valve seat assembly 11 and the fixed gear 19 need to have a relatively fixed position during initial installation to define the relative positional relationship in the circumferential direction between the flow control part 203 on the valve block 20 and the flow regulating part 117 of the valve seat assembly 11 when the planetary carrier stop 1813 and the fixed gear stop are in contact.

[0065] In this embodiment, the initial positions of the fixed gear 19 and the valve seat assembly 11 are mainly achieved by the positioning protrusion 1A and the positioning hole 1B.

[0066] For details, please refer to Figure 5 In this embodiment, the fixed gear 19 is further provided with a fixed gear positioning part 194. The fixed gear positioning part 194 is generally formed by extending axially along the lower surface of the fixed gear stop part 193 toward the valve seat assembly 11. The fixed gear positioning part 194 can be integrally formed with the fixed gear stop part 193 or fixedly connected. For example, the fixed gear positioning part 194 is in the form of a positioning pin, which is assembled and fixed with the fixed gear stop part 193, and the positioning pin protrudes from the lower surface of the fixed gear stop part 193. In this embodiment, the fixed gear 19 is formed with the fixed gear positioning part 194 and the fixed gear stop part 193 during injection molding. In addition, please refer to Figure 1-3 The valve seat assembly 11 is provided with a valve seat positioning hole 119. The valve seat positioning hole 119 can be a blind hole structure provided on the valve seat 111, or it can be a through hole structure. Before the valve seat assembly 11 is assembled and fixed with the fixed gear 19, the fixed gear positioning part 194 can be inserted into the valve seat positioning hole 119, so that at least a part of the fixed gear positioning part 194 is located in the valve seat positioning hole 119. At this time, the relative position of the planetary carrier stop part 1813 with respect to the valve seat assembly 11 in the circumferential direction can be defined by the valve seat positioning hole 119 and the fixed gear positioning part 194. In this embodiment, the positioning protrusion 1A is the fixed gear positioning part 194, and the positioning hole 1B is the valve seat positioning hole 119.

[0067] When the electric valve is in operation, the fluid medium (such as refrigerant) flowing in through the first pipe 114 may impact the gears and other components inside the electric valve, which may affect the product's service life and performance.

[0068] In order to reduce the adverse effects of the fluid medium on the gears and other components inside the electric valve, the electric valve provided in this embodiment has a fixed gear stop 193 projected toward the valve seat assembly 11 in the axial direction, which at least partially covers the valve inlet 1121.

[0069] With the above settings, the fluid medium flowing into the valve chamber A from the first pipe 114 will at least partially impact the fixed gear stop part 193. Therefore, the impact force of the fluid medium will be at least partially absorbed and dispersed by the fixed gear stop part 193, which can reduce the impact of the fluid medium on gears and other components, and increase the service life and performance of the product. Compared with electric valves where the fluid medium directly impacts gears and other components, the electric valve provided by this solution has higher stability.

[0070] Of course, when the fixed gear stop 193 covers the entire inlet 112 in its projection toward the valve seat assembly 11, theoretically more of the impact force of the fluid medium will be absorbed by the fixed gear stop 193, and the effect will be better.

[0071] In this embodiment, the fixed gear stop part 193 includes a covering surface 1931, which is the portion of the fixed gear stop part 193 that covers the bottom surface of the inlet part 112 along the axial direction of the valve body 1. At this time, the distance D1 between the covering surface 1931 and the valve inlet part 1121 is greater than 0.

[0072] At this time, the fluid medium flowing in from the inlet 112 can be buffered and dispersed by the distance between the above-mentioned covering surface 1931 and the inlet 112. This buffering and dispersion effect can relatively reduce the impact force of the fluid medium on the fixed gear stop part 193.

[0073] The assembly process of the electric valve is described below. First, the valve seat assembly 11 can be assembled and fixed as a single component, namely, the assembly consisting of the valve seat 111, the first connecting pipe 114, and the second connecting pipe 115. After assembly, it is then fixed by welding. Then, the valve shaft 14 is fixedly connected to the valve seat assembly 11. The valve shaft 14 can be fixedly connected to the valve seat assembly by welding or by press fitting. Then, the fixed gear 19 is fixedly connected to the valve seat assembly 11. Then, the planetary gear assembly 18 with the valve block 20 is installed, that is, the valve block through hole 201 is installed along the valve shaft 14, so that the contact surface 2031 of the valve block 20 is in contact with the mating surface 116 of the valve seat assembly 11, and the planetary gear 183 of the planetary gear assembly 18 meshes with the fixed gear body 191. Then, the rotor 12 with the sun gear component 13, the spring 17, and the bushing 16 are installed. Then, the housing component 15 is installed. It should be noted that the housing component 15 here can be assembled by welding the first housing component 151 and the second housing component 152 as described above, or the housing component 15 can be integrally stamped. The housing component 15 has a first side wall portion 1512, a second side wall portion 1522, a first top wall portion 1511, and a second top wall portion 1521, and the housing component 15 is welded and fixed to the valve seat assembly 11.

[0074] It should be noted that the above assembly sequence can also be adjusted accordingly. For example, the valve block 20 and planetary gear assembly 18 can be assembled first, and then the fixed gear 19 can be welded and fixed to the valve seat assembly 11. That is, the above assembly process is only an example of one assembly method of the electric valve provided in this embodiment, and does not mean that the only assembly sequence of the electric valve is limited.

[0075] In addition, please refer to the following for details. Figure 2 In this embodiment, the sun gear component 13 includes a sun gear portion 132, which is a gear of the sun gear component 13, a major diameter portion 1321 and a minor diameter portion 1322. The major diameter portion 1321 is approximately the outer edge of the addendum circle of the sun gear component 13, and the minor diameter portion 1322 is approximately the inner edge of the root circle of the sun gear component 13.

[0076] In this embodiment, the sun gear component 13 is inserted from top to bottom into the middle position of the planetary gear assembly 18, so that the gear of the sun gear component 13 meshes with the planetary gear 183, and the sun gear pressing part 133 abuts against the valve block 20.

[0077] Furthermore, in order to smoothly insert the sun gear component 13 into the planetary gear assembly 18 from top to bottom, it is understood that there is no overlap between the area between the addendum circle and the root circle of the sun gear component and the projection of the sun gear pressing part 133 in the axial direction. This projection surface can be the upper surface of the valve seat 111.

[0078] When the outer contour of the sun gear pressing part 133 is set to a circle, the outer diameter of the sun gear pressing part 133 is smaller than the diameter of the sun gear minor diameter part 1322.

[0079] During the rotation of the sun gear assembly 13 and the planetary gear assembly 18, the planetary gear assembly 18 may move up and down along the axial direction of the valve body 1.

[0080] To reduce the occurrence of this situation, the planetary carrier 181 provided in this embodiment also includes a planetary carrier limiting part 1814. The planetary carrier limiting part 1814 is generally a structure that extends circumferentially along the inner edge of the planetary carrier base plate 1812 toward the center. In this embodiment, the planetary carrier limiting part 1814 and the planetary carrier base plate 1812 are integrally formed, that is, the planetary carrier limiting part 1814 and the planetary carrier base plate 1812 are integrally injection molded.

[0081] Of course, the planetary carrier limiting part 1814 and the planetary carrier base plate 1812 can also be a separate and then fixedly connected structure.

[0082] In the axial direction of the electric valve, the projections of the sun gear pressing part 133 and the planet carrier limiting part 1814 do not overlap, while the projections of the planet carrier limiting part 1814 and the sun gear large diameter part 1321 do overlap.

[0083] When both the inner edge of the planet carrier limiting part 1814 and the outer edge of the sun gear pressing part 133 are circular, the inner diameter of the planet carrier limiting part 1814 is larger than the outer diameter of the sun gear pressing part 133.

[0084] In addition, in the axial direction of the electric valve, the planetary carrier limiting part and the sun gear part are provided with an axial distance D2.

[0085] With the above settings, under normal circumstances, such as when the electric valve is not energized, the planetary carrier limiting part 1814 does not contact the sun gear component 13. When the planetary gear assembly 18 moves upward a certain distance along the axial direction of the valve body 1 (this distance is D2 if the electric valve is not equipped with gaskets or other components), the planetary carrier limiting part 1814 abuts against the gear of the sun gear component 13, which can limit the planetary gear from continuing to move upward. This can increase the stability of the planetary gear assembly 18 in the electric valve and also reduce the noise caused by the vertical displacement of the planetary gear assembly 18 relative to the fixed gear 19.

[0086] With the above settings, the displacement of the planetary gear assembly 18 relative to the fixed gear 19 in the axial direction of the electric valve is limited by the distance between the valve block 20 and the large diameter portion 1321 of the sun gear. That is, in the normal state, the planetary carrier limiting portion 1814 abuts against the upper end face of the valve block 20. When the planetary gear assembly 18 moves upward a certain distance relative to the fixed gear, the planetary carrier limiting portion 1814 abuts against the sun gear component 13.

[0087] It is worth noting that the sun gear component 13 abuts against the valve block 20. This includes both direct abutment between the sun gear component 13 and the valve block 20 and indirect abutment between the sun gear component 13 and the valve block 20. When the sun gear component 13 and the valve block 20 abut indirectly, gaskets or other components can be provided between the sun gear component 13 and the valve block 20.

[0088] The electric valve provided in this embodiment has its planetary carrier stop part 1813 and planetary carrier limit part 1814 both located on the planetary carrier 181. On the same component, it not only limits the start position and end position of the planetary gear assembly 18, but also reduces the impact of the fluid medium on the gears and other components, thereby reducing noise and increasing the service life and stability of the product. These functions are all integrated into the planetary carrier 181, which is also conducive to the miniaturization of the product.

[0089] Please refer to the following for details. Figure 13-15 , Figure 13 This is a cross-sectional schematic diagram of a second embodiment of the electric valve provided by the present invention; Figure 14 for Figure 13 Schematic diagram of the middle valve seat assembly. Figure 15 for Figure 13 Top view of the middle valve seat assembly.

[0090] For ease of description, components with the same structure and function as those in the first embodiment are referred to by the same reference numerals. The description of each component in the first embodiment is also applicable to the second embodiment. The differences from the first embodiment will be described in detail below.

[0091] In this embodiment, the structure of the valve seat assembly 11 is slightly different. Specifically, the valve seat assembly 11 provided in this embodiment includes a valve seat 111, a first connecting pipe 114 and a second connecting pipe 115. The number of first connecting pipes 114 is 1, and the number of second connecting pipes 115 is 3. Of course, the number of second connecting pipes 115 can be set to other numbers, such as 1, 2 or more, according to the needs of the system.

[0092] Valve seat 111, first connecting pipe 114, and second connecting pipe 115 are fixedly assembled. The first connecting pipe 114 and the second connecting pipe 115 serve as the inlet and outlet pipes for the fluid medium of the electric valve, respectively, and are generally used to connect to the system piping in refrigeration and heating systems such as refrigerators, freezers, and air conditioners.

[0093] The valve seat 111 is generally plate-shaped and has a valve seat hole 1111 located at approximately its center. In this embodiment, the valve seat hole 1111 is a blind hole, that is, it does not penetrate the valve seat 1111. After assembly, one end of the valve shaft 14 is inserted into the valve seat hole 1111 for fixation.

[0094] Correspondingly, the valve seat assembly 11 is also provided with an inlet 112 and an outlet 113. In this embodiment, the number of outlets 113 is the same as the number of second connecting pipes 115, which is three. Both the inlet 112 and the outlet 113 are through holes penetrating the upper and lower surfaces of the valve seat 111. The first connecting pipe 114 is fixedly connected to the valve seat 111 through the inlet 112, and the second connecting pipe 115 is fixedly connected to the valve seat 111 through the outlet 113. In addition, the inlet 112 is also provided with a valve inlet 1121. The valve inlet 1121 is the valve port of the inlet 112 relatively close to the planetary gear assembly 18. The outlet 113 is also provided with a valve outlet 1131. The valve outlet 1131 is the valve port of the outlet 113 relatively close to the planetary gear assembly 18. In this embodiment, the number of valve outlets 1131 is the same as the number of second connecting pipes 115, which is three.

[0095] The electric valve provided by the present invention has a valve block 20 that rotates circumferentially relative to the valve seat assembly 11 under the drive of the rotor 12. At the same time, the notch 2032 of the valve block 20 can pass through three valve outlets 1131 in sequence. When the notch 2032 is located at a certain valve outlet 1131, the second connecting pipe 115 corresponding to that valve outlet 1131 is in the open position, and the fluid medium can pass through the second connecting pipe 115. The other valve outlets 1131 are covered by the contact surface 2031 of the valve block 20, and the corresponding second connecting pipes 115 are in the closed position, and the fluid medium cannot pass through these second connecting pipes 115.

[0096] Please refer to the following for details. Figure 17 , Figure 17 This is a cross-sectional schematic diagram of the third embodiment of the electric valve provided by the present invention.

[0097] For ease of description, components with the same structure and function as those in the first embodiment are referred to by the same reference numerals. The description of each component in the first embodiment is also applicable to the third embodiment. The differences from the first embodiment will be described in detail below.

[0098] In this embodiment, the fixed gear 19 includes a fixed gear positioning hole 195, which is generally a hole-like structure formed by recessing along the lower surface of the fixed gear stop 193 away from the valve seat 111. The valve seat assembly 11 includes a valve seat positioning part 120, which is generally a structure formed by protruding along the upper surface of the valve seat 111. The valve seat positioning part 120 protrudes from the upper surface of the valve seat 111 and can be integrally formed or fixedly connected to the valve seat 111. For example, the valve seat positioning part 120 adopts the form of a positioning pin, which is assembled and fixed to the valve seat 111, and the positioning pin protrudes from the upper surface of the valve seat 111, at least partially located in the stop positioning hole 195. In this embodiment, the valve seat 111 and the valve seat positioning part 120 are formed when machining the valve seat assembly 111, that is, the valve seat 111 and the valve seat positioning part 120 are an integral structure. Furthermore, at least a portion of the valve seat positioning part 120 is located in the stop positioning hole part 195. At this time, the initial position of the fixed gear 19 and the valve seat assembly 11 is mainly achieved by positioning the valve seat positioning part 120 and the fixed gear positioning hole part 195. The positioning protrusion 1A includes the valve seat positioning part 120, and the positioning hole part 1B includes the stop positioning hole part 195.

[0099] Of course, the present invention does not exclude the option of simultaneously providing the valve seat positioning hole portion 119, the valve seat positioning portion 120, the fixed gear positioning portion 194, and the fixed gear positioning hole portion 195.

[0100] It should be noted that the directional terms such as up, down, left, and right mentioned in this embodiment are all introduced for ease of description based on the accompanying drawings in the specification; and the terms "first" in the component names,

[0101] The ordinal numbers such as "second" are introduced for ease of description and do not imply any limitation on the order of components. Furthermore, in the embodiments described in this specification, various combinations can be made for each implementation of a particular component or assembly, provided the conditions for combination are met. This is not limited to the technical features described in that implementation. For example, a specific implementation of the first plate-like portion described above can be combined with other implementations of the fixed gear to form a new embodiment. Due to space limitations, this specification cannot describe every technical solution resulting from the arrangement and combination of different technical features as separate embodiments. However, those skilled in the art should understand that new technical solutions formed by combining technical features without creative effort (such as making only adaptive structural adjustments known in the art when combining two components or parts) are all within the scope of protection of the claims of this invention.

[0102] The electric valve provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An electrically operated valve characterised in that, The valve body (1) includes a valve seat assembly (11) and a fixed gear (19). The fixed gear (19) includes a fixed gear body (191) and a fixed gear connecting part (192). The fixed gear body (191) and the fixed gear connecting part (192) are integral structures. The fixed gear connecting part (192) is fixedly connected to the valve seat assembly (11). The valve seat assembly (11) includes an inlet (112), the inlet (112) includes a valve inlet (1121), the fixed gear (19) also includes a fixed gear stop (193), and along the axial direction of the valve body (1), the projection of the fixed gear stop (193) toward the valve seat assembly (11) at least partially covers the valve inlet (1121); the fixed gear stop (193) includes a covering surface (1931), and along the axial direction of the valve body (1), the covering surface (1931) is the portion of the valve inlet (1121) covered by the projection of the fixed gear stop (193) toward the valve seat assembly (11), and the distance D1 between the covering surface (1931) and the valve inlet (1121) is greater than 0.

2. The electric valve according to claim 1, characterized in that, The fixed gear stop (193) and the valve seat assembly (11) are provided with a positioning protrusion (1A) and a positioning hole (1B), respectively, with the positioning protrusion (1A) being at least partially located in the positioning hole (1B).

3. The electric valve according to any one of claims 1-2, characterized in that, It also includes a planetary gear assembly (18), a sun gear assembly (13), and a valve shaft (14). The valve shaft (14) is fixedly connected to the valve seat assembly (11). The sun gear assembly (13) includes a through hole (131), and the valve shaft (14) passes through the through hole (131). The planetary gear assembly (18) includes a planet carrier (181) and planetary gears (183). The planetary gears (183) mesh with the fixed gear body (191), and the sun gear assembly (13) meshes with the planetary gears (183). The planet carrier (181) includes a planet carrier base plate (1812) and a planet carrier stop (1813), the planet carrier stop (1813) protruding from the lower surface of the planet carrier base plate (1812); The furthest distance between the planetary carrier stop (1813) and the axis of the valve shaft (14) is greater than the closest distance between the fixed gear stop (193) and the axis of the valve shaft (14). The planetary carrier stop (1813) and the fixed gear stop (193) have overlapping projections along the axis of the valve body (1).

4. The electric valve according to claim 3, characterized in that, It also includes a valve block (20), the valve block (20) includes a valve block through hole (201), the valve block through hole (201) penetrates the upper and lower surfaces of the valve block (20), and the valve shaft (14) passes through the valve block through hole (201). The valve block (20) is connected to the planetary carrier (181) or is an integral structure.

5. The electric valve according to claim 4, characterized in that, The planetary carrier (181) includes a base plate protrusion (1815) that protrudes from the lower surface of the planetary carrier base plate (1812). The valve block (20) includes a valve block mating hole (202) that is at least partially located in the valve block mating hole (202). The planetary carrier (181) is fixedly connected to or limited to the valve block (20).

6. The electric valve according to any one of claims 1-2 and 4-5, characterized in that, The fixed gear (19) further includes a fixed gear stop (193), one of the fixed gear stop (193) and the valve seat assembly (11) is provided with a positioning protrusion (1A) and the other is provided with a positioning hole (1B), and the positioning protrusion (1A) is at least partially located in the positioning hole (1B).

7. The electric valve according to claim 6, characterized in that, The fixed gear (19) further includes a fixed gear positioning part (194), which protrudes from the lower surface of the fixed gear stop part (193). The valve seat assembly (11) includes a valve seat positioning hole part (119), at least a portion of the fixed gear positioning part (194) is located in the valve seat positioning hole part (119). The positioning protrusion (1A) includes the fixed gear positioning part (194), and the positioning hole part (1B) includes the valve seat positioning hole part (119).

8. The electric valve according to claim 6, characterized in that, The fixed gear (19) includes a fixed gear positioning hole (195), the valve seat assembly (11) includes a valve seat positioning part (120), the valve seat positioning part (120) protrudes from the upper surface of the valve seat (111), at least a portion of the valve seat positioning part (120) is located in the fixed gear positioning hole (195), the positioning protrusion (1A) includes the valve seat positioning part (120), and the positioning hole (1B) includes the fixed gear positioning hole (195).

9. The electric valve according to any one of claims 1, 2, 4, 5, 7, and 8, characterized in that, It also includes a housing component (15), which includes a first housing component (151) and a second housing component (152). The first housing component (151) includes a first top wall portion (1511) and a first side wall portion (1512). The first top wall portion (1511) is the top portion of the first housing component (151), and the first side wall portion (1512) is the side portion of the first housing component (151). The second housing component (152) includes a second top wall portion (1521) and a second side wall portion (1522). The second top wall portion (1521) is the top portion of the second housing component (152), and the second side wall portion (1522) is the side portion of the second housing component (152). The diameter of the second side wall portion (1522) is larger than the diameter of the first side wall portion (1512). The first side wall portion (1512) is fixed to the second top wall portion (1521).

10. The electric valve according to claim 9, characterized in that, The valve seat assembly (11) includes a step portion (118), the step portion (118) includes a step horizontal portion (1181) and a step vertical portion (1182), the step horizontal portion (1181) is located circumferentially outside the step vertical portion (1182); The projections of the second sidewall portion (1522) and the longitudinal portion of the step (1182) along the axis of the electric valve overlap.

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