Electric valve

Abstract

An electric valve comprises a valve body, the valve body comprises a valve seat assembly and a fixed gear, the fixed gear comprises a fixed gear main body and a fixed gear connecting part, the fixed gear main body and the fixed gear connecting part are an integral structure, and the fixed gear connecting part is fixedly connected to the valve seat assembly; the electric valve also comprises a fixed gear stopper, the fixed gear main body and the fixed gear stopper are integrally injection molded; the fixed gear stopper and the valve seat assembly are provided with a positioning protrusion on one side and a positioning hole on the other side, the positioning protrusion is at least partially located in the positioning hole, so as to realize the positioning of the fixed gear relative to the circumferential direction of the valve seat assembly, so as to control the initial actuation position of the valve block relative to the circumferential direction of the valve seat assembly.

Description

[Technical field]

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

[0002] Electric valves are mainly used in refrigeration systems. In an electric valve including a gear mechanism, the stator coil of the electric valve is connected to a drive controller. After the drive controller is energized, a pulse drive signal is sent to the stator coil. The stator coil generates a changing magnetic field, causing 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 switching of the refrigerant path. [Summary of the invention]

[0003] The object of the present invention is to provide an electric valve which can control the initial actuation position of a valve block relative to the circumferential direction of a valve seat assembly.

[0004] In order to achieve the above purpose, the following technical solutions are adopted:

[0005] An electric valve comprises a valve body, the valve body comprises a valve seat assembly, a fixed gear, the fixed gear comprises a fixed gear body and a fixed gear connecting portion, the fixed gear body and the fixed gear connecting portion are an integral structure, and the fixed gear connecting portion is fixedly connected to the valve seat assembly;

[0006] The electric valve further comprises a fixed gear stopper, and the fixed gear body and the fixed gear stopper are integrally injection molded;

[0007] One of the fixed gear stopper and the valve seat assembly is provided with a positioning protrusion, and the other is provided with a positioning hole. The positioning protrusion is at least partially located in the positioning hole.

[0008] In the electric valve provided by the present invention, one of the fixed gear stop portion and the valve seat assembly is provided with a positioning protrusion, and the other is provided with a positioning hole. When the fixed gear and the valve seat assembly are assembled, it is only necessary to make at least a part of the positioning protrusion located in the positioning hole to achieve the circumferential positioning of the fixed gear relative to the valve seat assembly, so as to control the initial actuation position of the valve block relative to the circumferential direction of the valve seat assembly.

Brief Description of the Drawings

[0009] Figure 1 A cross-sectional schematic diagram of an embodiment of the present invention;

[0010] Figure 2 for Figure 1 A cross-sectional schematic diagram of the sun gear component;

[0011] Figure 3 for Figure 1 Schematic diagram of the structure of the middle valve seat assembly;

[0012] Figure 4 for Figure 1 A top view of the middle valve seat assembly;

[0013] Figure 5 for Figure 1 A schematic diagram of the structure of the inverted fixed gear;

[0014] Figure 6 for Figure 1 Schematic diagram of the structure of the planetary gear assembly;

[0015] Figure 7 for Figure 1 An exploded diagram of the planetary gear assembly;

[0016] Figure 8 for Figure 5 Schematic diagram of the structure of the inverted planet carrier;

[0017] Fig. 9 for Figure 1 A schematic diagram of the structure of the inverted valve block;

[0018] Fig.10 for Figure 1 Bottom view of the middle valve block;

[0019] Fig.11 It is a schematic diagram of the position relationship between the valve block and the valve seat assembly when the electric valve is in a fully closed state;

[0020] Fig.12 It is a schematic diagram of the position relationship between the valve block and the valve seat assembly when the electric valve is in the intermediate state of flow regulation;

[0021] Fig.13 It is a schematic diagram of the position relationship between the valve block and the valve seat assembly when the electric valve is in a fully open flow state;

[0022] Fig.14 A cross-sectional schematic diagram of a second embodiment of the electric valve provided by the present invention;

[0023] Fig.15 for Fig.14 Schematic diagram of the structure of the middle valve seat assembly;

[0024] Fig.16 for Fig.14 A top view of the middle valve seat assembly;

[0025] Fig.17 This is a cross-sectional schematic diagram of a third embodiment of the electric valve provided by the present invention.

[0026] The above drawings include the following reference numerals:

[0027] 1. Valve body; 11. Valve seat assembly; 111. Valve seat; 1111. Valve seat hole; 112. Inlet; 1121. Valve inlet port; 113. Outlet; 1131. Valve outlet; 114. First connecting pipe; 115. Second connecting pipe; 116. Matching surface; 117. Flow regulating part; 117a. First curve; 117b. Second curve; 118. Step portion; 1181. Step horizontal portion; 1182 , step longitudinal portion; 119, valve seat positioning hole portion; 120, valve seat positioning portion; 12, rotor; 13, sun gear component; 131, through hole; 132, sun gear gear portion; 1321, sun gear large diameter portion; 1322, sun gear small diameter portion; 133, sun gear pressing portion; 15, housing component; 151, first housing component; 1511, first top wall portion; 1512, first side wall portion; 152, second housing component ; 1521, second top wall; 1522, second side wall; 16, bushing; 17, spring; 18, planetary gear assembly; 181, planet carrier; 1811, support column; 1812, planet carrier bottom plate; 1813, planet carrier stopper; 1814, planet carrier limiter; 1815; bottom plate protrusion; 182, cover plate; 183, planetary gear; 184, planetary gear shaft; 19, fixed gear; 191, Fixed gear body; 192, fixed gear connection; 193, fixed gear stopper; 1931, covering surface; 194, fixed gear positioning portion; 195, fixed gear positioning hole; 20, valve block; 201, valve block through hole; 202, valve block matching hole; 203, flow control part 203; 2031, fitting surface; 2032, notch; 1A, positioning protrusion; 1B positioning hole: A, valve cavity; [Specific implementation method]

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Please refer to Figure 1 , Figure 1 Schematic cross-sectional view of an embodiment of the present invention. 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 the drive controller. When the drive controller is powered on, a pulse drive signal is sent to the stator coil, and the stator coil generates a periodically changing magnetic field, thereby driving the rotor 12 of the electric valve to rotate forward or reverse.

[0030] Please refer to Figure 2 , Figure 2 for Figure 1Schematic cross-sectional view of the sun gear component in FIG. 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, it can also be set to a limit connection mode, 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 the center thereof, and the valve shaft 14 is passed 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 shaft sleeve 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.

[0031] The electric valve includes a shell component 15. In the present embodiment, the shell component 15 includes a first shell component 151 and a second shell component 152. The first shell component 151 is generally in the shape of a sleeve with one end open, and can be made of stainless steel material, and 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 shell component 151, and the first side wall portion 1512 is generally the side portion of the first shell component 151; the second shell component 152 is generally in the shape of a sleeve with two ends open, and can also be made of stainless steel material, and 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 shell component 152, and the second side wall portion 1522 is generally the side portion of the second shell component 152. The diameter of the second side wall portion 1522 of the second housing component 152 is greater than the diameter of the first side wall portion 1512 of the first housing component 151, so that the lower end of the first housing component 151 can be fixed to the second top wall portion 1521 of the second housing component 152, for example, by welding. The lower edge of the second side wall portion 1522 of the second housing component 152 is fixedly connected to the valve seat assembly 11, for example, by welding. Of course, the attached Figure 1As a specific embodiment, a specific structure and connection method of the first shell component 151 and the second shell component 152 are shown. Those skilled in the art can also make certain changes. For example, the second shell component 152 does not have a second top wall portion 1521, but is an equal-diameter sleeve with two ends open, and a bottom wall portion extending radially outward is provided at the bottom of the first shell component 151, and then fixedly connected with the second shell component 152, so as to achieve the above connection relationship. Alternatively, the first shell component 151 and the second shell component 152 are no longer distinguished, but are made into an integrally formed shell component 15, for example, a metal plate is used for one-time stamping to simultaneously form 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, which can also achieve the purpose of the present invention. The embodiment adopts the method of connecting the first shell component 151 and the second shell component 152, which is only a specific implementation means and cannot be understood as limiting the scope of protection.

[0032] The electric valve provided in this embodiment also includes a sleeve 16, which can be made of a polymer material such as rubber. The sleeve 16 is arranged in the first shell component 151 of the shell component 15. The sleeve 16 can be clearance-fitted, transition-fitted or interference-fitted with the first shell component 151. A through hole or a blind hole is arranged at the approximate center position of the sleeve 16, and one end of the valve shaft 14 is penetrated through the through hole or the blind hole, so that at least a part of the end of the valve shaft 14 relatively away from the valve seat 111 is located in the through hole or the blind hole, so that the axis of the valve shaft 14 is roughly coincident with the axis of the valve body 1. The valve shaft 14 and the through hole or the blind hole can also be clearance-fitted, transition-fitted or interference-fitted. The arrangement of the sleeve 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 being offset relative to 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 roughly located at the axis of the electric valve.

[0033] In addition, a spring 17 is arranged between the sleeve 16 and the sun gear component 13, that is, one end of the spring 17 abuts against the sleeve 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, and the direction of the elastic force is roughly vertically downward along the axis direction of the valve body 1. In this way, the sun gear component 13 can be restrained from excessive upward displacement. More specifically, a sun gear pressing portion 133 is arranged at the lower end of the sun gear component 13. The sun gear pressing portion 133 is roughly a structure formed by extending downward along the circumferential direction of the gear of the sun gear component 13. The sun gear pressing portion 133 abuts against the valve block 20 (mentioned below), and the valve block 20 is subjected to the elastic force load of the spring 17, so that the valve block 20 fits the matching surface 116 of the valve seat assembly 11.

[0034] It should be noted that in the connection mode between the sun gear component 13 and the rotor 12 in this embodiment, the lower end of the spring 17 abuts against the rotor 12, and since the sun gear component 13 and the rotor 12 are fixedly connected or position-limitedly connected, the two can be regarded as a component, so there are many structural combinations, and therefore, it can also be set that the lower end of the spring 17 abuts against the sun gear component 13.

[0035] In the valve cavity A roughly surrounded by the first housing component 151, the second housing component 152, and the valve seat component 11, a planetary gear assembly 18, a fixed gear 19, and a valve block 20 are also arranged. The main working principle is: the rotor 12 and the sun gear component 13 rotate to drive the planetary gear 183 of the planetary gear assembly 18 to rotate, and the planetary gear 183 rotates while driving the valve block 20 to rotate, so as to change the position of the valve block 20 relative to the valve seat component 11, so as to achieve the purpose of controlling the flow. The following will introduce the structure and connection or matching relationship of the valve seat component 11, the planetary gear assembly 18, the fixed gear 19, and the valve block 20.

[0036] The electric valve provided in this solution adopts a planetary gear reduction system, which can achieve relatively precise regulation of the refrigerant flow of refrigeration systems such as refrigerators compared to the capillary throttling method.

[0037] Please refer to Figure 3-4 ,in, Figure 3 The structural diagram of the valve seat assembly 11 provided in this embodiment is as follows, Figure 4The 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 are respectively used as the inflow and outflow pipes of the fluid medium of the electric valve, and are generally used for connecting with the system pipeline when installed in a refrigerator, a freezer, an air conditioner and other refrigeration and heating systems.

[0038] The valve seat 111 is generally in a plate-like structure, and has a valve seat hole 1111 disposed substantially in the center thereof. In this embodiment, the valve seat hole 1111 is in a blind hole structure, that is, it does not penetrate the valve seat 1111. Of course, the valve seat hole 1111 can also be in the form of a through hole. During assembly, one end of the valve shaft 14 is inserted into the valve seat hole 1111 and fixed.

[0039] The valve seat assembly 11 is also provided with an inlet portion 112 and an outlet portion 113, both of which 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 portion 112, and the second connecting pipe 115 is fixedly connected to the valve seat 111 through the outlet portion 113, in addition, the inlet portion 112 is also provided with a valve inlet port 1121, and the valve inlet port 1121 is a valve port of the inlet portion 112 relatively close to the planetary gear assembly 18; the outlet portion 113 is also provided with a valve outlet port 1131, and the valve outlet port 1131 is a valve port of the outlet portion 113 relatively close to the planetary gear assembly 18.

[0040] A mating surface portion 116 is provided on the side of the valve seat 111 relatively close to the planetary gear assembly 18, and the valve seat assembly 11 is provided with a flow regulating portion 117 formed by being recessed in the axial direction of the mating surface 116. Of course, the flow regulating portion 117 can also be processed separately and then fixedly connected to the valve seat 1111. The flow regulating portion 117 is in the shape of a narrow and long arc groove as a whole, and the edge line of the flow regulating portion 117 is defined by the first curve 117a and the second curve 117b. The first curve 117a and the second curve 117b can be circular arc lines, and the first curve 117a is located outside the circumference of the second curve 117b (with the valve seat hole portion 1111 as the center of the circle), and the flow regulating portion 117 is connected to the valve outlet portion 1121, and the spacing between the first curve 117a and the second curve 117b increases gradually along the direction close to the outlet portion 113. In this way, the flow regulating part 117 has a smaller overall size, and compared with a common flow regulating valve with a needle valve structure, it is particularly suitable for precise regulation of small flow rates, such as refrigerant flow regulation in a refrigerator refrigeration system.

[0041] Furthermore, the depth of the flow regulating portion 117 may be set so that the depth of the flow regulating portion 117 at one end away from the valve outlet portion 1131 gradually increases toward the depth of the end close to the valve outlet portion 1131 .

[0042] In actual operation, the width and depth of the flow regulating portion 117 can be set accordingly according to the system flow requirements to meet different needs.

[0043] Please refer to Figure 5 , Figure 5 It is a schematic diagram of the structure of the fixed gear 19 provided in this embodiment of the present invention when it is inverted. The fixed gear 19 is roughly cylindrical, and includes a fixed gear main body 191 and a fixed gear connecting part 192. The fixed gear main body 191 and the fixed gear connecting part 192 are an integral structure, that is, the fixed gear main body 191 and the fixed gear connecting part 192 are an integral structure in the actual product and cannot be separated from each other. Specifically, the fixed gear connecting part 192 can be made of a metal structure (such as 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 main body 191, or the fixed gear main body 191 can be integrally molded with the fixed gear main body by 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.

[0044] In addition, the fixed gear 19 provided in this embodiment further includes a fixed gear stopper 193 , which is approximately located axially below the fixed gear body 191 . The fixed gear stopper 193 can be integrally injection molded with the fixed gear body 191 .

[0045] Please refer to Figure 2 In order 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 along its circumference, and the step portion 118 includes a step transverse portion 1181 and a step longitudinal portion 1182. The step transverse portion 1181 is roughly distributed in the horizontal direction, and the step longitudinal portion 1182 is roughly distributed in the vertical direction. The step transverse portion 1181 is roughly located on the circumferential outside of the step longitudinal portion 1182. At this time, the step portion 118 is roughly in the shape of a step set in the positive direction.

[0046] When the shell component 15 and the valve seat assembly 11 are fixedly connected, the second side wall portion 1522 can be inserted along the step longitudinal portion 1182 until the lower end of the second side wall portion 1522 abuts against the step transverse portion 1181, and then the valve seat assembly 11 and the subject component 15 are fixedly connected by welding. At this time, there is an overlapping part between the projection of the second side wall portion 1522 and the step longitudinal portion 1182 along the axis of the electric valve.

[0047] At this time, the inner diameter of the second shell side wall portion 1522 is not less than the diameter of the step longitudinal portion 1182 , and the inner diameter of the second shell side wall portion 1522 is less than the outer diameter of the step transverse portion 1181 .

[0048] The setting of the step portion 118 can play a guiding and limiting role, so that the valve seat assembly 11 and the fixed gear 19 are more reliably connected; at the same time, it can improve the coaxiality of the axis of the valve seat assembly 11 and the axis of the fixed gear 19, so that the relative movement between the gears inside the valve body 1 is smoother.

[0049] In addition, the fixed gear connecting portion 192 is roughly in the shape of a hollow cylinder, and its lower edge is lower than the axial lower end of the fixed gear stop portion 193, that is, there is an axial distance between the fixed gear stop portion 193 and the end of the fixed gear connecting portion 192 close to the valve seat 111. At this time, at least a portion of the lower end of the fixed gear connecting portion 192 is sheathed on the step longitudinal portion 1182 of the step portion 118, and then the valve seat assembly 11 is fixedly connected to the fixed gear 19.

[0050] Please refer to Figure 1-2 In the process of fixed connection between the valve seat assembly 11 and the fixed gear 19, the fixed gear connection part 192 is sleeved on the step longitudinal part 1182, and the step longitudinal part 1182 can provide guidance for the fixed gear 19. In addition, when the fixed gear connection part 192 abuts against the step transverse part 1181, the fixed gear connection part 192 cannot continue to move downward relative to the valve seat assembly 11, and the step transverse part 1181 can limit the fixed gear 19. After that, the valve seat assembly 11 and the fixed gear 19 can be fixedly connected by welding or crimping. The fixed gear 19 provided in this embodiment is fixed to the valve seat assembly 11 structure, and one end of the fixed gear 19 is fixedly connected to the valve seat assembly 11, and the assembly is relatively simple.

[0051] Please refer to Figure 6-8 , Figure 6 is a schematic diagram of the structure of the planetary gear assembly 18 provided in this embodiment, Figure 7 An exploded schematic diagram of the planetary gear assembly 18 provided in this embodiment, Figure 8A schematic diagram of the structure of the planetary carrier when the planetary carrier provided in this embodiment is inverted. 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 illustrates the structure of three planetary gears. In fact, the structure of the planetary gears can be set according to the needs of the output torque and is not limited to three planetary gears. In this embodiment, the number of support columns 1811 is also 3, and they are evenly distributed in the circumferential direction, and the three planetary gears 183 are arranged between two adjacent support columns 1811.

[0052] The planet carrier 181 and the cover plate 182 are fixedly connected to axially limit the planetary gear 183. Specifically, a small hole can be provided on the cover plate 182, and one end of the support column 1811 is extended out of the small hole of the cover plate 182 and then crimped and deformed to achieve fixed connection. The planet carrier 181 can be made of plastic injection molding, and the cover plate 182 can be made of metal sheet stamping. In this way, the end 18111 can be easily heated and deformed, so that the cover plate will not be separated from the planet carrier. The through holes of the three planetary gears 183 are penetrated through the planetary gear shaft 184, and are respectively arranged on the planetary carrier 181 through the planetary gear shaft 184, and 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 close to the cover plate 182 can also be fixedly connected to the cover plate 182 by hot melt riveting.

[0053] Taking one of the planetary gears 183 as an example, during assembly, the sun gear component 13 is inserted downward from the center of the planetary gear assembly 18, so that the planetary gears 1831 of the sun gear component 13 are meshed, so that the rotor 12 can drive the planetary gears 183 to rotate when rotating. The inner and outer sides of the three planetary gears 183 respectively define two virtual circles. The gear located on the inner side of the circumference of the planetary gear 1831 is meshed with the sun gear component 13, and the gear located on the outer side of the planetary gear 1831 is meshed with the fixed gear part 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 the planetary gears 183 rotate around the planetary gear shaft 184, they also rotate along the trajectory defined by the fixed gear body 1911 of the fixed gear 19. In this way, the electric valve drives the rotor 12 and the sun gear component 13 to rotate by energizing the electromagnetic coil, and the planetary gear set 183 is decelerated, and finally drives the planet carrier 181 to rotate.

[0054] In addition, the planet carrier 181 provided in this embodiment also includes a planet carrier stop portion 1813, which is a structure that protrudes downward approximately along the planet carrier base plate 1812 toward the axial direction of the electric valve, that is, the planet carrier stop portion 1813 protrudes from the lower surface of the planet carrier base plate 1812.

[0055] The farthest distance between the planetary carrier stop 1813 and the axis of the valve shaft 14 is greater than the shortest 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), and there is an overlapping portion in the projection of the planetary carrier stop 1813 and the fixed gear stop 193 of the fixed gear 19 along the axial center line of the valve body 1.

[0056] At this time, when the planet carrier 181 rotates relative to the valve seat assembly 11, the planet carrier stopper 1813 and the fixed gear stopper 193 of the fixed gear 19 can define the actuation start position and actuation end position of the planetary gear assembly 18, that is, when the planet carrier 181 rotates to the extreme position in the clockwise direction (the planet carrier stopper 1813 abuts against the fixed gear stopper 193 of the fixed gear 19), the planet carrier 181 cannot continue to rotate; when the planet carrier 181 rotates to the extreme position in the counterclockwise direction (the planet carrier stopper 1813 abuts against the fixed gear stopper 193 of the fixed gear 19), the planet carrier 181 cannot continue to rotate. The cooperation between the planet carrier stopper 1813 and the fixed gear stopper 193 of the fixed gear 19 determines the rotation stroke and angle of the planet carrier 181. It should be noted that the circumferential length of the planet carrier stop portion 1813 (specifically, the circumferential length at the point where it abuts against the fixed gear stop portion 193) can be adjusted according to the needs of the system, thereby adjusting the rotation angle between the actuation starting position and the actuation ending position of the planet carrier 181.

[0057] Please refer to Figure 9-10 , Fig. 9 This is a schematic diagram of the structure of the valve block 20 provided in this embodiment when it is inverted. Fig.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 the valve block 20 can be substantially circular, the valve block 20 includes a valve block through hole portion 201 approximately located at the center of the valve block, the valve block through hole portion 201 passes through the upper and lower surfaces of the valve block 20, and the valve shaft 14 is penetrated by the valve block through hole portion 201. In addition, the valve block 20 and the planetary carrier 181 can be fixedly connected or limit-connected. In this embodiment, the planetary carrier 181 is provided with a bottom plate protrusion 1815, and the bottom plate protrusion 1815 is roughly a structure in which the planetary carrier bottom plate 1812 protrudes downward toward the axial direction of the electric valve. Correspondingly, the valve block 20 includes a valve block matching hole portion 202 that matches the bottom plate protrusion 1815 of the planetary carrier 181. The valve block matching hole portion 202 can be in the form of a blind hole or a through hole. The bottom plate protrusion 1815 at least partially penetrates the valve block matching hole portion 202, so that the planetary carrier 181 and the valve block 20 are fixedly connected or limit-connected, and can synchronously drive the valve block 20 to rotate while the planetary carrier 181 rotates.

[0058] A flow control unit 203 is provided at the bottom of the valve block 20. Figure 7 As shown, the flow control part 203 extends a certain height along the axial direction on the bottom surface of the valve block 20 (except the flow control part 203), forming a fitting surface 2031 for fitting with the matching surface 116 of the valve seat assembly 11 and being relatively rotatable. The fitting surface 2031 can fit against the matching surface 116 under the elastic load of the spring 17. At the same time, the flow control part 203 is also provided with a notch portion 2032. The notch portion 2032 is roughly a structure formed by partially recessing the fitting surface 2031 toward the axial direction of the electric valve. In this way, when the valve block 20 is against the valve seat assembly 11, the position of the flow control part 203 at the notch portion 2032 does not contact the matching surface 116 of the valve seat assembly 11. In this way, the fluid medium can flow from the space formed by the notch portion 2032 and the valve seat 111.

[0059] By fitting the flow control part 203 with the mating surface part 116 of the valve seat assembly 11, the notch part 2032 of the flow control part 203 corresponds to different circumferential positions of the flow regulating part 117 of the valve seat assembly 11, thereby realizing the flow regulating function.

[0060] Of course, in addition to the form that the planet carrier 181 and the valve block 20 are two parts connected together, the planet carrier 181 and the valve block 20 can also be integrally formed, that is, the planet carrier 181 and the valve block 20 are integrally injection molded.

[0061] Combine the following Figure 11-13 To illustrate the process of flow regulation. Fig.11 Schematic diagram of the positional relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in a fully closed state. Fig.12 Schematic diagram of 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. Fig.13 It is a schematic diagram of the positional relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in a fully open flow state.

[0062] like Fig.11 As shown, the fixed gear stopper 193 of the fixed gear 19 abuts against one side of the planet carrier stopper 1813. Fig.11 In the projection diagram shown, there is no overlapping part between the notch portion 2032 provided in the flow control portion 203 and the projections of the flow regulating portion 117 and the valve outlet portion 1131 in the axial direction of the electric valve, that is, the flow regulating portion 117 and the valve outlet portion 1131 are both covered by the fitting surface portion 2031, so that the fluid cannot flow out from the notch portion 2032, and the electric valve is in a fully closed state at this time.

[0063] like Fig.12 As shown, after the valve block 20 rotates counterclockwise by a certain angle, the projection of the notch 2032 and the flow regulating part 117 in the axial direction of the electric valve partially overlaps, namely the α area shown in the figure. The α area is a part of the flow regulating part 117. At this time, the fluid can flow into the valve cavity 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 of the electric valve. Those skilled in the art can understand that Fig.10 A specific position of the valve block 20 is shown. As the valve block 20 rotates continuously, the corresponding α area will gradually change, thereby causing the flow of the electric valve to change. This process is the flow regulation process of the electric valve.

[0064] like Fig.13 As shown, the planet carrier 181 rotates counterclockwise until the planet carrier stopper 1813 abuts against the other side of the fixed gear stopper 193 and stops rotating. Accordingly, the valve block 20 also stops rotating. At this time, the notch 2032 and the portion of the flow regulating portion 117 close to the valve outlet 1131 and the axial projection of the valve outlet 1131 form an overlapping area, that is, the valve outlet 1131 is located as a whole at the position covered by the notch 2032. At this time, the fluid in the valve cavity A of the electric valve flows in from the space formed by the notch 2032 and flows out from the valve outlet 1131. Fig.13 middle β As shown in the area, the electric valve is in full open state at this time.

[0065] 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 limit the starting position and the ending position of the planetary gear assembly 18 relative to the valve seat assembly 11, the flow regulating part 117 and the fixed gear 19 of the valve seat assembly 11 need to have a relatively fixed position during the initial installation to limit the relative position relationship of the flow control part 203 on the valve block 20 relative to the flow regulating part 117 of the valve seat assembly 11 in the circumferential direction when the planetary carrier stop 1813 and the fixed gear stop are in contact with each other.

[0066] 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.

[0067] For details, please refer to Figure 5 In this embodiment, the fixed gear 19 is further provided with a fixed gear positioning portion 194. The fixed gear positioning portion 194 is roughly a structure formed by extending axially along the lower surface of the fixed gear stop portion 193 toward the valve seat assembly 11. The fixed gear positioning portion 194 can be integrally formed with the fixed gear stop portion 193 or fixedly connected. For example, the fixed gear positioning portion 194 is in the form of a positioning pin, which is assembled and fixed with the fixed gear stop portion 193, and the positioning pin protrudes from the lower surface of the fixed gear stop portion 193. In this embodiment, the fixed gear 19 forms the fixed gear positioning portion 194 and the fixed gear stop portion 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, which can be a blind hole structure provided on the valve seat 111, or 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 portion 194 can be inserted into the valve seat positioning hole 119, so that at least part of the fixed gear positioning portion 194 is located in the valve seat positioning hole 119. At this time, the relative position of the planet carrier stopper 1813 relative to the valve seat assembly 11 in the circumferential direction can be limited by the valve seat positioning hole 119 and the fixed gear positioning portion 194. In this embodiment, the positioning protrusion 1A is the fixed gear positioning portion 194, and the positioning hole 1B is the valve seat positioning hole 119.

[0068] When the electric valve is working, the fluid medium (such as refrigerant) flowing in through the first connecting pipe 114 may have an impact on the gears and other components in the electric valve, and the impact may affect the service life and performance of the product.

[0069] In order to reduce the adverse impact of the fluid medium on the gears and other components in the electric valve, the electric valve provided in this embodiment has a projection of the fixed gear stopper 193 toward the valve seat assembly 11 in the axial direction that at least partially covers the valve inlet 1121 .

[0070] Through the above arrangement, the fluid medium flowing into the valve chamber A from the first connecting pipe 114 will at least partially impact the fixed gear stop portion 193. Therefore, the impact force of the fluid medium will be at least partially absorbed and dispersed by the fixed gear stop portion 193, which can reduce the impact of the fluid medium on other components such as gears and increase the service life and performance of the product.

[0071] Of course, when the projection of the fixed gear stopper 193 toward the valve seat assembly 11 covers the entire inlet portion 112 , more impact force of the fluid medium will be absorbed by the fixed gear stopper 193 in theory, and the effect is better at this time.

[0072] In this embodiment, the fixed gear stop portion 193 includes a covering surface 1931, which covers the bottom surface of the inlet portion 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 portion 1121 is greater than 0.

[0073] At this time, the fluid medium flowing in from the inlet portion 112 can be buffered and dispersed by the distance between the above covering surface 1931 and the inlet portion 112 , and the buffering and dispersion effect can relatively reduce the impact force of the fluid medium on the fixed gear stopper 193 .

[0074] The assembly process of the electric valve is described below. The valve seat assembly 11 can be assembled and fixed into a component, that is, the assembly consisting of the valve seat 111, the first connecting pipe 114 and the second connecting pipe 115. After assembly, it is 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 11 by welding or by pressing. Then, the fixed gear 19 is fixedly connected to the valve seat assembly 11. Then, the planetary gear assembly 18 provided with the valve block 20 is installed, that is, the valve block through hole portion 201 is installed along the valve shaft 14, so that the fitting surface portion 2031 of the valve block 20 fits with the matching surface 116 of the valve seat assembly 11, and the planetary gears 183 of the planetary gear assembly 18 are meshed with the fixed gear main body portion 191. Then, the rotor 12 with the sun gear component 13, the spring 17, and the shaft sleeve 16 are installed. Then, the housing component 15 is installed. It should be noted that the housing component 15 here can be the first housing component 151 and the second housing component 152 prepared separately as described above and then assembled into the housing component 15 by welding, 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 fixed to the valve seat assembly 11 by welding.

[0075] It should be noted that the above assembly sequence can also be adjusted accordingly, for example, the valve block 20 and the planetary gear assembly 18 can be assembled first, and then the fixed gear 19 and the valve seat assembly 11 can be welded and fixed. That is, the above assembly process is only an exemplary description of an assembly method of the electric valve provided in this embodiment, and does not mean to limit the only assembly sequence of the electric valve.

[0076] In addition, please refer to Figure 2 In the present embodiment, the sun gear component 13 includes a sun gear gear portion 132, which is a gear of the sun gear component 13, a sun gear large diameter portion 1321 and a sun gear small diameter portion 1322, wherein the sun gear large diameter portion 1321 is roughly the outer edge portion where the top circle of the sun gear component 13 is located, and the sun gear small diameter portion 1322 is roughly the inner edge portion where the root circle of the sun gear component 13 is located.

[0077] In this embodiment, the sun gear component 13 is inserted into the middle position of the planetary gear assembly 18 from top to bottom, so that the gear of the sun gear component 13 is meshed with the planetary gear 183 , and the sun gear pressing portion 133 is pressed against the valve block 20 .

[0078] In addition, in order to smoothly insert the sun gear component 13 from top to bottom into the planetary gear assembly 18, it can be understood that there is no overlapping area between the area between the top circle and the root circle of the sun gear component and the projection of the sun gear pressing portion 133 in the axial direction, and the projection surface can be the upper surface of the valve seat 111.

[0079] When the outer contour of the sun gear pressing portion 133 is set to be circular, the outer diameter of the sun gear pressing portion 133 is smaller than the diameter of the sun gear small diameter portion 1322 .

[0080] During the rotation of the sun gear component 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 .

[0081] In order to reduce the occurrence of this situation, the planetary carrier 181 provided in this embodiment also includes a planetary carrier limiting portion 1814, and the planetary carrier limiting portion 1814 is roughly a structure formed by extending circumferentially along the inner edge of the planetary carrier bottom plate 1812 toward the center of the circle. In this embodiment, the planetary carrier limiting portion 1814 and the planetary carrier bottom plate 1812 are an integrally molded structure, that is, the planetary carrier limiting portion 1814 and the planetary carrier bottom plate 1812 are integrally injection molded.

[0082] Of course, the planet carrier limiting portion 1814 and the planet carrier bottom plate 1812 may also be structures that are separated and then fixedly connected.

[0083] In the axial direction of the electric valve, there is no overlapping area between the projections of the sun gear pressing portion 133 and the planet carrier limiting portion 1814 , and there is an overlapping area between the projections of the planet carrier limiting portion 1814 and the sun gear large diameter portion 1321 .

[0084] When the inner edge of the planet carrier limiting portion 1814 and the outer edge of the sun gear pressing portion 133 are both circular, the inner diameter of the planet carrier limiting portion 1814 is greater than the outer diameter of the sun gear pressing portion 133 .

[0085] In addition, in the axial direction of the electric valve, the planet carrier limiting portion and the sun gear portion are provided with an axial distance D2.

[0086] Through the above arrangement, under normal circumstances, such as when the electric valve is not energized, the planetary carrier limit portion 1814 does not contact the sun gear component 13. When the planetary gear assembly 18 moves upward along the axial direction of the valve body 1 for a certain distance (when the electric valve is not provided with gaskets and other components, the distance is D2), the planetary carrier limit portion 1814 and the gear of the sun gear component 13 are offset against each other, which can limit the planetary gear from continuing to move upward, thereby increasing the stability of the planetary gear assembly 18 in the electric valve and reducing the noise generated by the up and down displacement of the planetary gear assembly 18 relative to the fixed gear 19.

[0087] Through the above arrangement, 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, under normal conditions, the planetary carrier limit portion 1814 abuts against the upper end surface of the valve block 20, and when the planetary gear assembly 18 moves upward a certain distance relative to the fixed gear, the planetary carrier limit portion 1814 abuts against the sun gear component 13.

[0088] It is worth noting that the sun gear component 13 and the valve block 20 are offset against each other, which includes direct offset between the sun gear component 13 and the valve block 20, and also includes indirect offset between the sun gear component 13 and the valve block 20. When the sun gear component 13 and the valve block 20 are indirectly offset against each other, gaskets and other components can be arranged between the sun gear component 13 and the valve block 20.

[0089] The electric valve provided in this embodiment has a planetary carrier stop portion 1813 and a planetary carrier limiting portion 1814 both located on the planetary carrier 181, which not only realizes limiting the actuation starting position and actuation ending position of the planetary gear assembly 18 on the same component, but also reduces the impact of the fluid medium on other components such as gears, thereby reducing noise and increasing the service life and stability of the product. These functions are integrated in the planetary carrier 181, which is also conducive to the miniaturization of the product.

[0090] Please refer to Figure 13-15 , Fig.13 A cross-sectional schematic diagram of a second embodiment of the electric valve provided by the present invention; Fig.14 for Fig.13 Schematic diagram of the structure of the valve seat assembly. Fig.15 for Fig.13 Top view of the center valve seat assembly.

[0091] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment, and the description of the components in the first embodiment is also applicable to the second embodiment. The differences from the first embodiment are described in detail below.

[0092] 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; wherein, the number of the first connecting pipe 114 is 1, and the number of the second connecting pipe 115 is 3. Of course, the number of the second connecting pipes 115 can be set to other numbers, such as 1, 2 or more, according to system requirements.

[0093] 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 are respectively used as the inflow and outflow pipes of the fluid medium of the electric valve, and are generally used to be installed in refrigerators, freezers, air conditioners and other refrigeration and heating systems and connected to the system pipelines.

[0094] The valve seat 111 is generally in a plate-like structure, and has a valve seat hole 1111 arranged in its approximate center. In this embodiment, the valve seat hole 1111 is a blind hole structure, that is, the valve seat 1111 is not penetrated. After assembly, one end of the valve shaft 14 is inserted into the valve seat hole 1111 and fixed.

[0095] Correspondingly, the valve seat assembly 11 is also provided with an inlet portion 112 and an outlet portion 113. In this embodiment, the number of the outlet portions 113 is the same as the number of the second connecting pipes 115, which is 3. The inlet portion 112 and the outlet portion 113 are both 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 portion 112, and the second connecting pipe 115 is fixedly connected to the valve seat 111 through the outlet portion 113. In addition, the inlet portion 112 is also provided with a valve inlet portion 1121. The valve inlet portion 1121 is a valve port of the inlet portion 112 relatively close to the planetary gear assembly 18; the outlet portion 113 is also provided with a valve outlet portion 1131, and the valve outlet portion 1131 is a valve port of the outlet portion 113 relatively close to the planetary gear assembly 18. In this embodiment, the number of the valve outlet portion 1131 is the same as the number of the second connecting pipes 115, which is 3.

[0096] In the electric valve provided by the present invention, the valve block 20 rotates circumferentially relative to the valve seat assembly 11 under the drive of the rotor 12. At the same time, the notch portion 2032 of the valve block 20 can pass through the three valve outlet portions 1131 in sequence. When the notch portion 2032 is located at a certain valve outlet portion 1131, the second connecting pipe 115 corresponding to the valve outlet portion 1131 is in an open position, and the fluid medium can pass through the second connecting pipe 115; while the remaining valve outlet portions 1131 are covered by the fitting surface portion 2031 of the valve block 20, and the corresponding second connecting pipe portions 115 are in a closed position, and the fluid medium cannot pass through these second connecting pipe portions 115.

[0097] Please refer to Fig.17 , Fig.17 This is a cross-sectional schematic diagram of a third embodiment of the electric valve provided by the present invention.

[0098] To facilitate the description of this embodiment, the same figure marks are used for components in this embodiment that have the same structure and the same function as those in the first embodiment. The description of the components in the first embodiment is also applicable to the third embodiment. The differences from the first embodiment are described in detail below.

[0099] In the present embodiment, the fixed gear 19 includes a fixed gear positioning hole portion 195, which is roughly a hole-shaped structure formed by being recessed along the lower surface of the fixed gear stop portion 193 toward and away from the valve seat 111. The valve seat assembly 11 includes a valve seat positioning portion 120, which is roughly a structure formed by protruding along the upper surface of the valve seat 111. The valve seat positioning portion 120 protrudes from the upper surface of the valve seat 111. The valve seat positioning portion 120 can be integrally formed with the valve seat 111 or fixedly connected. For example, the valve seat positioning portion 120 is in 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, and is at least partially located in the fixed gear positioning hole portion 195. In the present embodiment, the valve seat 111 and the valve seat positioning portion 120 are formed when the valve seat assembly 111 is machined, that is, the valve seat 111 and the valve seat positioning portion 120 are an integral structure. Furthermore, at least part of the valve seat positioning portion 120 is located at the fixed gear positioning hole portion 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 portion 120 and the fixed gear positioning hole portion 195. The positioning protrusion 1A includes the valve seat positioning portion 120, and the positioning hole portion 1B includes the fixed gear positioning hole portion 195.

[0100] Of course, the present invention does not exclude the solution 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 .

[0101] It should be noted that the directional nouns such as up, down, left, and right mentioned in this embodiment are all based on the drawings in the specification and are introduced for the convenience of description; and the ordinal numbers such as "first" and "second" in the names of the components are also introduced for the convenience of description, and do not mean any limitation on any order of the components. In addition, in the embodiments recorded in this specification, various combinations can be made for each implementation of a certain component or assembly under the condition of combination, without being limited to the technical features recorded in the implementation. For example, a specific implementation of the first plate-shaped portion mentioned above can be combined with other implementations of the fixed gear to form a new embodiment. Due to space limitations, this specification cannot describe all technical solutions after each arrangement and combination of different technical features as embodiments, but those skilled in the art should understand that new technical solutions formed by technical features that can be combined without creative work (such as only making adaptive structural adjustments known in the art when two components or parts are combined) are within the scope of protection of the claims of the present invention.

[0102] The above is a detailed introduction to the electric valve provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An electric valve, characterized in that: The invention comprises a valve body (1) and a planetary gear assembly (18), wherein the planetary gear assembly (18) comprises a planet carrier stopper (1813), the valve body (1) comprises a valve seat assembly (11), and a fixed gear (19), wherein the fixed gear (19) comprises a fixed gear body (191) and a fixed gear connecting portion (192), wherein the fixed gear body (191) and the fixed gear connecting portion (192) are an integral structure, and the fixed gear connecting portion (192) is fixedly connected to the valve seat assembly (11); The fixed gear (19) further comprises a fixed gear stop portion (193), and the planet carrier stop portion (1813) is capable of abutting against the fixed gear stop portion (193); one of the fixed gear stop portion (193) and the valve seat assembly (11) is provided with a positioning protrusion (1A), and the other is provided with a positioning hole portion (1B), and the positioning protrusion (1A) is at least partially located in the positioning hole portion (1B); The valve seat assembly (11) comprises an inlet portion (112), the inlet portion (112) comprises a valve inlet portion (1121), and along the axial direction of the valve body (1), a projection of the fixed gear stop portion (193) toward the valve seat assembly (11) at least partially covers the valve inlet portion (1121).

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

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

4. The electric valve according to claim 1, characterized in that: The fixed gear stop portion (193) includes a covering surface (1931). Along the axial direction of the valve body (1), the covering surface (1931) is a projection of the fixed gear stop portion (193) toward the valve seat assembly (11) that covers the portion of the valve inlet port (1121). A distance D1 between the covering surface (1931) and the valve inlet port (1121) is greater than 0.

5. The electric valve according to any one of claims 1 to 4, characterized in that: It also comprises a sun gear component (13) and a valve shaft (14), the valve shaft (14) being fixedly connected to the valve seat component (11), the sun gear component (13) comprising a through hole (131), the valve shaft (14) passing through the through hole (131), the planetary gear component (18) comprising a planet carrier (181) and a planetary gear (183), the planetary gear (183) being meshed with the fixed gear body (191), and the sun gear component (13) being meshed with the planetary gear (183); The planet carrier (181) comprises a planet carrier base plate (1812) and a planet carrier stopper (1813), wherein the planet carrier stopper (1813) protrudes from the lower surface of the planet carrier base plate (1812); The farthest distance between the planet carrier stopper (1813) and the axis of the valve shaft (14) is greater than the shortest distance between the fixed gear stopper (193) and the axis of the valve shaft (14); There is an overlapping portion between the planet carrier stopper (1813) and the fixed gear stopper (193) in their projections along the axis of the valve body (1).

6. The electric valve according to claim 5, characterized in that: Also comprising a valve block (20), the valve block (20) comprising a valve block through hole portion (201), the valve block through hole portion (201) penetrating the upper and lower surfaces of the valve block (20), and the valve shaft (14) passing through the valve block through hole portion (201); The valve block (20) is connected to or forms an integral structure with the planet carrier (181).

7. The electric valve according to claim 6, characterized in that: The planet carrier (181) comprises a bottom plate protrusion (1815), the bottom plate protrusion (1815) protruding from the lower surface of the planet carrier bottom plate (1812), the valve block (20) comprises a valve block matching hole portion (202), the bottom plate protrusion (1815) is at least partially located in the valve block matching hole portion (202), and the planet carrier (181) is fixedly connected or limit-connected to the valve block (20).

8. The electric valve according to any one of claims 1 to 4, characterized in that: The invention also comprises a shell component (15), wherein the shell component (15) comprises a first shell component (151) and a second shell component (152), wherein the first shell component (151) comprises a first top wall portion (1511) and a first side wall portion (1512), wherein the first top wall portion (1511) is roughly the top portion of the first shell component (151), and the first side wall portion (1512) is roughly the side portion of the first shell component (151); the second shell component (152) comprises a second top wall portion (1521) and a second side wall portion (1522), wherein the second top wall portion (1521) is roughly the top portion of the second shell component (152), and the second side wall portion (1522) is roughly the side portion of the second shell component (152); the diameter of the second side wall portion (1522) is greater than the diameter of the first side wall portion (1512); and the first side wall portion (1512) is fixed to the second top wall portion (1521).

9. The electric valve according to claim 8, characterized in that: The valve seat assembly (11) comprises a step portion (118), wherein the step portion (118) comprises a step transverse portion (1181) and a step longitudinal portion (1182), wherein the step transverse portion (1181) is substantially located on the circumferential outer side of the step longitudinal portion (1182); There is an overlapping portion between the second side wall portion (1522) and the stepped longitudinal portion (1182) when projected along the axis of the electric valve.

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