Motorised valve

Abstract

An electric valve comprises a coil and a valve body, the coil is sleeved on the valve body, the valve body comprises a valve seat assembly, a valve shaft, a planetary gear assembly and a valve block; the valve seat assembly comprises a valve seat, the valve seat comprises a valve seat hole part, one end of the valve shaft is located in the valve seat hole part, and the valve shaft is fixedly connected with the valve seat; the planetary gear assembly comprises a planet carrier, the planet carrier comprises a planet carrier bottom plate, and the planet carrier bottom plate is provided with a through hole penetrating through the upper and lower surfaces thereof; the valve block comprises a valve block through hole part, the valve block through hole part penetrates through the upper and lower surfaces of the valve block; the valve block is integrally injection molded with the planet carrier; the valve shaft is arranged in the valve block through hole part and the through hole of the planet carrier bottom plate, and the valve block is supported on the valve seat, so that the process of separately machining the planet carrier and the valve block and then fixedly assembling them can be omitted, and the production efficiency is relatively high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration control, in particular to an electric valve. BACKGROUND

[0002] The electric valve is mainly applied to a refrigeration system, in an electric valve including a gear mechanism, a coil of the electric valve is connected to a drive controller, after the drive controller is powered on, the drive controller sends a pulse drive signal to the coil, the coil generates a changing magnetic field, so that a rotor of the electric valve rotates, and the rotor can drive a valve block to rotate relative to a valve seat through the gear mechanism, thereby realizing refrigerant flow control or switching of a refrigerant passage. SUMMARY

[0003] The present application aims to provide an electric valve, including a coil and a valve body, the coil is sleeved on the valve body, the valve body includes a valve seat assembly, a valve shaft, a planetary gear assembly and a valve block;

[0004] The valve seat assembly includes a valve seat, the valve seat includes a valve seat hole part, one end of the valve shaft is located in the valve seat hole part, and the valve shaft is fixedly connected with the valve seat;

[0005] The planetary gear assembly includes a planet carrier, the planet carrier includes a planet carrier bottom plate, and the planet carrier bottom plate is provided with a through hole penetrating through upper and lower surfaces thereof;

[0006] The valve block includes a valve block through hole part, and the valve block through hole part penetrates through upper and lower surfaces of the valve block;

[0007] The valve block is integrally injection molded with the planet carrier, the valve shaft is arranged in the valve block through hole part and the through hole of the planet carrier bottom plate, and the valve block is supported on the valve seat.

[0008] The electric valve provided by the present application is integrally injection molded with the planet carrier and the valve block, so that the process of separately processing and then fixedly assembling the planet carrier and the valve block can be omitted, and the production efficiency is relatively high. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a sectional view of an embodiment of the present application;

[0010] Figure 2 It is a sectional view of a sun gear part; Figure 1

[0011] It is a sectional view of a planet carrier part; Figure 3 Figure 1 It is a structural view of a valve seat assembly;

[0012] Figure 4 It is a top view of the valve seat assembly; Figure 1

[0013] ​​Figure 5 Fig. 1 is a schematic view of the structure of the electric valve according to the present application; Figure 1 Fig. 2 is a schematic view of the structure of the fixed gear in the inverted position;

[0014] Figure 6 Fig. 3 is a schematic view of the structure of the planetary gear assembly; Figure 1

[0015] Figure 7 Fig. 4 is an exploded schematic view of the planetary gear assembly; Figure 1

[0016] Figure 8 Fig. 5 is a schematic view of the structure of the planetary carrier in the inverted position; Figure 5

[0017] Figure 9 Fig. 6 is a schematic view of the structure of the valve block in the inverted position; Figure 1

[0018] Figure 10 Fig. 7 is a bottom view of the valve block; Figure 1

[0019] Figure 11 Fig. 8 is a schematic view of the positional relationship between the valve block and the valve seat assembly when the electric valve is in the fully closed state;

[0020] Figure 12 Fig. 9 is a schematic view of the positional relationship between the valve block and the valve seat assembly when the electric valve is in the intermediate state of flow regulation;

[0021] Figure 13 Fig. 10 is a schematic view of the positional relationship between the valve block and the valve seat assembly when the electric valve is in the maximum flow opening state;

[0022] Figure 14 Fig. 11 is a schematic view of the cross-section of the second embodiment of the electric valve according to the present application;

[0023] Figure 15 Fig. 12 is a schematic view of the structure of the valve seat assembly; Figure 14

[0024] Figure 16 Fig. 13 is a top view of the valve seat assembly; Figure 14

[0025] Fig. 14 is a schematic view of the cross-section of the third embodiment of the electric valve according to the present application; Figure 17

[0026] Fig. 15 is a schematic view of the structure of the planetary carrier and the valve block of the fourth embodiment of the electric valve according to the present application. Figure 18 The above-mentioned drawings include the following reference signs:

[0027]

[0028] ​​​​​​​1, valve body; 11, valve seat assembly; 111, valve seat; 1111, valve seat hole part; 112, inlet part; 1121, inlet valve port part; 113, outlet part; 1131, outlet valve port part; 114, first connecting pipe; 115, second connecting pipe; 116, matching surface part; 117, flow rate adjusting part; 117a, first curve; 117b, second curve; 118, step part; 1181, step horizontal part; 1182, step vertical part; 12, rotor; 13, sun gear part; 131, sun gear through hole part; 132, sun gear gear part; 1321, sun gear large diameter part; 1322, sun gear small diameter part; 133, sun gear pressing part; 14, valve shaft; 15, housing part; 151, first housing part; 1511, first top wall part; 1512, first side wall part; 152, second housing part; 1521, second top wall part; 1522, second side wall part; 16, shaft sleeve; 17, spring; 18, planetary gear assembly; 181, carrier; 1811, support column; 1812, carrier bottom plate; 1813, carrier stop part; 1814, carrier limiting part; 1815, bottom plate protruding part; 182, cover plate; 183, planetary gear; 184, planetary gear shaft; 19, fixed gear; 191, fixed gear main body part; 192, fixed gear connecting part; 193, fixed gear stop part; 1931, covering surface; 194, positioning protruding part; 195, fixed gear positioning hole part; 20, valve block; 201, valve block through hole part; 202, valve block matching hole part; 203, flow rate control part; 2031, abutting surface part; 2032, notch part; A, valve cavity; DETAILED DESCRIPTION

[0029] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0030] Please refer to Figure 1 , Figure 1 is a cross-sectional view of an embodiment of the present application. As shown in Figure 1 , the electric valve provided by the embodiment includes a valve body 1 and a 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 coil of the electric valve is connected to a driving controller. After the driving controller is powered on, it will send a pulse driving signal to the coil, and the coil will generate a periodically changing magnetic field, thereby driving the rotor 12 of the electric valve to rotate in a forward direction or a reverse direction.

[0031] Please refer to Figure 2 , Figure 2 for Figure 1The cross-sectional view of the sun gear component. The rotor 12 is connected with the sun gear component 13, so that when the rotor 12 rotates, the sun gear component 13 can rotate synchronously. In this embodiment, the rotor 12 is fixedly connected with the sun gear component 13. Of course, the rotor 12 and the sun gear component 13 can also be arranged in a limited connection manner, as long as the rotor 12 can drive the sun gear component 13 to rotate. The sun gear component 13 is provided with a sun gear through hole portion 131 passing through the center thereof, and the valve shaft 14 is arranged in the sun gear through hole portion 131. The sun gear component 13 can rotate around the valve shaft 14. One end of the valve shaft 14 is fixedly connected with the valve seat assembly 11, and the other end is connected with the shaft sleeve 16 arranged at the top of the valve body 1 (which will be mentioned below) or directly connected with the housing 15. In this way, the valve shaft 14 can provide better concentricity for the rotation of the rotor 12 and the sun gear component 13.

[0032] Please continue to refer to Figure 1 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 in the form of a sleeve with one end open and can be made of stainless steel. It includes a first top wall portion 1511 and a first side wall portion 1512. The first top wall portion 1511 is substantially the top portion of the first housing component 151, and the first side wall portion 1512 is substantially the side portion of the first housing component 151. The second housing component 152 is generally in the form of a sleeve with both ends open and can also be made of stainless steel. It includes a second top wall portion 1521 and a second side wall portion 1522. The second top wall portion 1521 is substantially the top portion of the second housing component 152, and the second side wall portion 1522 is substantially the side portion of the second housing 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. In this way, the lower end of the first housing component 151 can be fixedly connected with the second top wall portion 1521 of the second housing component 152, such as by welding. The lower end edge portion of the second side wall portion 1522 of the second housing component 152 is fixedly connected with the valve seat assembly 11, such as by welding.

[0033] Of course, as a specific embodiment, Figure 1The specific structure and connection mode of the first shell part 151 and the second shell part 152 are shown, and those skilled in the art can also make certain changes, for example, the second shell part 152 is not provided with the second top wall part 1521, but is an equal-diameter sleeve with both ends open, and a bottom wall part extending radially outward is arranged at the bottom of the first shell part 151, and then is fixedly connected with the second shell part 152; or, the first shell part 151 and the second shell part 152 are no longer distinguished, but are integrally formed into a shell part 15, for example, a metal plate is once stamped to form the first side wall part 1512, the second side wall part 1522, the first top wall part 1511, and the second top wall part 1521, which can also achieve the purpose of the present application. The connection mode of the first shell part 151 and the second shell part 152 in the embodiment is only a specific implementation method, and cannot be understood as a limitation on the protection scope.

[0034] Please refer to Figure 3 In order to further ensure the stability and connection strength of the fixed gear 19 and the valve seat assembly 11 during connection, the valve seat assembly 11 is also provided with a step part 118 distributed in the circumferential direction, the step part 118 includes a step horizontal part 1181 and a step vertical part 1182, the step horizontal part 1181 is distributed in the horizontal direction, the step vertical part 1182 is distributed in the vertical direction, and the step horizontal part 1181 is located at the circumferential outer edge of the step vertical part 1182, at this time, the step part 118 is substantially in the form of a step arranged in the positive direction.

[0035] During the fixed connection operation of the shell part 15 and the valve seat assembly 11, the second side wall part 1522 can be sleeved along the step vertical part 1182 first until the lower end of the second side wall part 1522 abuts against the step horizontal part 1181, and then the valve seat assembly 11 and the shell part 15 are fixedly connected by welding, at this time, the second side wall part 1522 and the step vertical part 1182 have overlapping parts in the projection along the axis of the electric valve.

[0036] Please refer to Figure 1The electric valve provided by the embodiment further comprises a shaft sleeve 16, which can be made of rubber or other polymer materials. The shaft sleeve 16 is arranged in the first housing part 151 of the housing part 15. The shaft sleeve 16 can be in transition fit or interference fit with the first housing part 151. A through hole or a blind hole is arranged at the approximate center of the shaft sleeve 16. One end of the valve shaft 14 is arranged in the through hole or the blind hole. At least part of the end of the valve shaft 14 away from the valve seat 111 is arranged in the through hole or the blind hole, so that the axis of the valve shaft 14 is approximately coincident with the axis of the valve body 1. In the embodiment, the valve shaft 14 is in transition fit with the through hole or the blind hole. The arrangement of the shaft sleeve 16 can provide good concentricity for the rotation of the rotor 12 and the sun gear part 13, reduce the deviation of the valve shaft 14 from the axis of the valve body 1, and increase the working stability and service life of the electric valve. In the embodiment, the valve shaft 14 is approximately arranged at the axis of the electric valve.

[0037] In addition, a spring 17 is arranged between the shaft sleeve 16 and the sun gear part 13. One end of the spring 17 is in abutment with the shaft sleeve 16, and the other end is in abutment with the rotor 12. Since the rotor 12 is fixedly or limitingly connected with the sun gear part 13, the spring 17 can exert a certain elastic force on the sun gear part 13 through the rotor 12. The direction of the elastic force is approximately vertically downward along the axis of the valve body 1. In this way, the excessive displacement of the sun gear part 13 upward during the working process of the electric valve can be restrained. More specifically, please refer to Figure 2 The sun gear part 13 is provided with a sun gear abutting part 133. The sun gear abutting part 133 is approximately formed by extending downward along the gear of the sun gear part 13. The valve block 20 (which will be mentioned below) is in abutment with the sun gear abutting part 133, so that the valve block 20 is subjected to the elastic load of the spring 17, and is adhered to the fitting surface part 116 of the valve seat assembly 11.

[0038] It should be noted that, in the connection mode of the sun gear part 13 and the rotor 12 in the embodiment, the lower end of the spring 17 is in abutment with the rotor 12. Since the sun gear part 13 and the rotor 12 are fixedly or limitingly connected, they can be regarded as one assembly. Therefore, there are various combinations in structure. Therefore, the lower end of the spring 17 can also be in abutment with the sun gear part 13.

[0039] In the valve cavity A which is roughly surrounded by the first housing part 151, the second housing part 152 and the valve seat assembly 11, a planetary gear assembly 18, a fixed gear 19 and a valve block 20 are also arranged, and the main working principle is that the rotation of the rotor 12 and the sun gear part 13 drives the planetary gear 183 of the planetary gear assembly 18 to rotate, and the planetary gear 183 drives the valve block 20 to rotate at the same time, so as to change the position of the valve block 20 relative to the valve seat assembly 11, so as to achieve the purpose of controlling the flow.

[0040] The structure and connection or cooperation relationship of the valve seat assembly 11, the planetary gear assembly 18, the fixed gear 19 and the valve block 20 will be introduced below.

[0041] The electric valve provided by the scheme adopts a planetary gear deceleration system, and can realize relatively accurate adjustment of the refrigerant flow of the refrigeration system compared with the capillary throttling method.

[0042] Please refer to Figures 3-4 , wherein, Figure 3 is a structure diagram of the valve seat assembly 11 provided by the embodiment, Figure 4 is a top view of the valve seat assembly 11 provided by the embodiment. The valve seat assembly 11 provided by the 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 inflow and outflow pipes of the electric valve fluid medium, and are generally used for connecting with system pipelines in the refrigeration and heating system of a refrigerator, a refrigerator cabinet, an air conditioner and the like.

[0043] The valve seat 111 is generally in a plate structure, and has a valve seat hole part 1111 arranged at a substantially central position thereof. In the embodiment, the valve seat hole part 1111 is in a blind hole structure, that is, does not penetrate the upper and lower surfaces of the valve seat 1111. Of course, the valve seat hole part 1111 can also adopt a through hole form. During assembly, one end of the valve shaft 14 is inserted into the valve seat hole part 1111 to be fixed.

[0044] The valve seat assembly 11 is also provided with an inlet part 112 and an outlet part 113. The inlet part 112 and the outlet part 113 are both through holes penetrating the upper and lower surfaces of the valve seat 111. The first connecting pipe 114 is fixedly connected with the valve seat 111 through the inlet part 112, and the second connecting pipe 115 is fixedly connected with the valve seat 111 through the outlet part 113. In addition, the inlet part 112 is also provided with an inlet valve port part 1121, which is a valve port of the inlet part 112 relatively close to the planetary gear assembly 18. The outlet part 113 is also provided with an outlet valve port part 1131, which is a valve port of the outlet part 113 relatively close to the planetary gear assembly 18.

[0045] Please refer to Figure 4On the side of the valve seat 111 relatively close to the planetary gear assembly 18, a matching surface 116 is arranged, and the valve seat assembly 11 is provided with a flow regulating portion 117 recessed in the axial direction of the matching surface 116. Of course, the flow regulating portion 117 can also be separately processed and then fixedly connected with the valve seat 111. The flow regulating portion 117 is in the shape of a long and narrow arc-shaped groove as a whole, and the edge line of the flow regulating portion 117 is defined by a first curve 117a and a second curve 117b. The first curve 117a and the second curve 117b can be in the shape of a circular arc, the first curve 117a is located outside the circumference of the second curve 117b (with the valve seat hole portion 1111 as the center), the flow regulating portion 117 is in communication with the valve outlet portion 1131, and the distance between the first curve 117a and the second curve 117b gradually increases in the direction close to the valve outlet portion 1131. In this way, the overall size of the flow regulating portion 117 is small, and it is more suitable for precise regulation of small flow.

[0046] Furthermore, the depth of the flow regulating portion 117 can also be set such that the depth of the end of the flow regulating portion 117 away from the valve outlet portion 1131 gradually increases towards the end close to the valve outlet portion 1131.

[0047] In actual operation, the width and depth of the flow regulating portion 117 can be set according to the needs of the system flow to meet different needs.

[0048] Please refer to Figure 5 , Figure 5 is a structural schematic diagram of the fixed gear 19 provided by the embodiment of the present application when it is inverted. The fixed gear 19 is generally in the shape of a cylinder, which includes a fixed gear main body portion 191 and a fixed gear connecting portion 192. The fixed gear main body portion 191 and the fixed gear connecting portion 192 are in an integrated structure, that is, the fixed gear main body portion 191 and the fixed gear connecting portion 192 are an integral structure in the actual product and cannot be separated from each other in the normal state. Specifically, the fixed gear connecting portion 192 can be in a metal structure (for example, stainless steel). During the manufacturing process of the fixed gear 19, the fixed gear connecting portion 192 can be used as an insert and integrally injection molded with the fixed gear main body portion 191, or the fixed gear main body portion 191 is integrally formed with the fixed gear main body portion by means of powder metallurgy or other means. The gear of the fixed gear main body portion 191 meshes with the planetary gear 183 of the planetary gear assembly 18 described below.

[0049] In addition, the fixed gear 19 provided by the embodiment further includes a fixed gear stop portion 193, which is generally located below the axial direction of the fixed gear main body portion 191. The fixed gear stop portion 193 can be integrally injection molded with the fixed gear main body portion 191.

[0050] The fixed gear connecting portion 192 is in a hollow cylindrical shape, and the lower end thereof is lower than the lower end surface of the fixed gear stop portion 193, i.e., there is an axial distance between the end surface of the fixed gear stop portion 193 and the end surface of the fixed gear connecting portion 192 close to the valve seat 111.

[0051] In the present embodiment, the valve seat assembly 11 is further provided with a stepped portion 118, and the lower end of the fixed gear connecting portion 192 is at least partially sleeved on the stepped longitudinal portion 1182 of the stepped portion 118, and then the valve seat assembly 11 is fixedly connected with the fixed gear 19.

[0052] For details, please refer to Figures 1-2 In the process of fixing the valve seat assembly 11 with the fixed gear 19, the fixed gear connecting portion 192 is sleeved on the stepped longitudinal portion 1182, which can provide guidance for the fixed gear 19. In addition, when the fixed gear connecting portion 192 abuts against the stepped transverse portion 1181, the fixed gear connecting portion 192 cannot continue to displace downward relative to the valve seat assembly 11, and the stepped transverse portion 1181 can limit the fixed gear 19. Then, the valve seat assembly 11 and the fixed gear 19 can be fixedly connected by welding or pressure bonding. The structure of the fixed gear 19 fixed to the valve seat assembly 11 provided in the present embodiment is that one end thereof is fixedly connected with the valve seat assembly 11, and the assembly is relatively simple.

[0053] For details, please refer to Figures 6-8 , Figure 6 is a structural schematic view of the planetary gear assembly 18 provided in the present embodiment, Figure 7 is an exploded schematic view of the planetary gear assembly 18 provided in the present embodiment, Figure 8 is a structural schematic view of the planetary carrier when it is inverted. The planetary gear assembly 18 comprises a planetary carrier 181, a cover plate 182 and planetary gears 183. The planetary carrier 181 is provided with a through hole at the approximate middle position thereof, and comprises a planetary carrier bottom plate 1812 and three support columns 1811 extending upward from the planetary carrier bottom plate 1812. It should be noted that the present embodiment shows the structure of three planetary gears 183, and in fact, the structure of the planetary gears 183 can be set according to the need for output torque, and the number thereof is not limited to three. In the present embodiment, the number of the support columns 1811 is also three, and they are uniformly distributed in the circumferential direction, and the planetary gears 183 are arranged between two adjacent support columns 1811.

[0054] The planet carrier 181 is fixedly connected with the cover plate 182 to limit the planet gears 183. Specifically, a through hole is provided on the cover plate 182, and one end of the support column 1811 is inserted into the through hole and then deformed by pressure to be fixedly connected with the cover plate 182. The planet carrier 181 can be formed by plastic injection molding, and the cover plate 182 can be formed by stamping a metal plate, so that the end 1811 can be deformed by heating or other methods, and the cover plate 182 cannot be separated from the planet carrier 181. The through holes of the three planet gears 183 are arranged on the planet gear shaft 184, and the planet gear shaft 184 is arranged on the planet carrier 181. The planet gears 183 can rotate around the planet gear shaft 184. One end of the planet gear shaft 184 is fixedly connected with or integrally formed with the planet carrier bottom plate 1812, and the other end is fixedly connected with the cover plate 182. Specifically, the end of the planet gear shaft 184 close to the cover plate 182 can also be fixedly connected with the cover plate 182 by hot riveting.

[0055] During assembly, the sun gear component 13 is inserted downward from the center of the planetary gear assembly 18, so that the gears of the sun gear component 13 are engaged with the planet gears 1831, so that the rotor 12 can drive the planet gears 183 to rotate. The inner side and the outer side of the three planet gears 183 define two virtual circles, respectively. The gears located on the inner side of the circumference of the planet gears 1831 are engaged with the gears of the sun gear component 13, and the gears located on the outer side of the planet gears 1831 are engaged with the gears of the fixed gear main body part 191 of the fixed gear 19. In this way, when the sun gear component 13 rotates, the planet gears 183 can rotate synchronously. The planet gears 183 rotate around the planet gear shaft 184 and also rotate along the track defined by the fixed gear main body part 191 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 finally drives the planet carrier 181 to rotate through the planetary gear set 183.

[0056] Please refer to Figure 7 、 Figure 8 The planet carrier 181 further includes a planet carrier stop portion 1813. The planet carrier stop portion 1813 protrudes downward along the planet carrier bottom plate 1812 in the axial direction of the electric valve, i.e., the planet carrier stop portion 1813 protrudes from the lower surface of the planet carrier bottom plate 1812.

[0057] The maximum distance between the planet carrier stop portion 1813 and the axis of the valve shaft 14 is greater than the minimum distance between the fixed gear stop portion 193 and the axis of the valve shaft 14, i.e., the axis of the rotation of the planetary gear assembly 18. The projections of the planet carrier stop portion 1813 and the fixed gear stop portion 193 along the axial center line of the valve body 1 overlap.

[0058] Thus, when the planet carrier 181 rotates relative to the valve seat assembly 11, the planet carrier stop portion 1813 and the fixed gear stop portion 193 of the fixed gear 19 can define the starting position and the ending position of the planet gear assembly 18, i.e., when the planet carrier 181 rotates to the limit position (the planet carrier stop portion 1813 abuts against the fixed gear stop portion 193) in the clockwise direction, the planet carrier 181 cannot continue to rotate; when the planet carrier 181 rotates to the limit position (the planet carrier stop portion 1813 abuts against the fixed gear stop portion 193) in the counterclockwise direction, the planet carrier 181 cannot continue to rotate. The rotation stroke and the angle of the planet carrier 181 are determined by the cooperation between the planet carrier stop portion 1813 and the fixed gear stop portion 193. It should be noted that the circumferential length of the planet carrier stop portion 1813 (specifically, the circumferential length at the position abutting against the fixed gear stop portion 193) can be adjusted according to the needs of the system, so that the rotation angle between the starting position and the ending position of the planet carrier 181 can be adjusted.

[0059] Please refer to Figures 9-10 , Figure 9 The structure of the valve block 20 provided in the embodiment is shown in the inverted view, Figure 10 The electric valve provided in the embodiment further includes a valve block 20, the axial projection of the valve block 20 can be generally circular, the valve block 20 includes a valve block through hole portion 201 located at the center of the valve block, the valve block through hole portion 201 penetrates through the upper and lower surfaces of the valve block 20, and the valve shaft 14 is arranged in the valve block through hole portion 201. In addition, the valve block 20 and the planet carrier 181 can be fixedly connected or limitingly connected. In the embodiment, the planet carrier 181 is provided with a bottom plate protruding portion 1815, which is generally a structure protruding downward in the axial direction of the electric valve. Correspondingly, the valve block 20 includes a valve block matching hole portion 202 matched with the bottom plate protruding portion 1815 of the planet carrier 181, the valve block matching hole portion 202 can be in the form of a blind hole or a through hole, and the bottom plate protruding portion 1815 is at least partially arranged in the valve block matching hole portion 202, so that the planet carrier 181 and the valve block 20 are fixedly connected or limitingly connected, and the valve block 20 can be synchronously rotated with the planet carrier 181 when the planet carrier 181 rotates.

[0060] The bottom of the valve block 20 is provided with a flow control portion 203, as shown in Figure 7As shown, the flow control portion 203 includes a fitting surface portion 2031 for fitting with and being rotatable relative to the fitting surface portion 116 of the valve seat assembly 11. The fitting surface portion 2031 is abutted against the fitting surface portion 116 under the elastic load of the spring 17. The flow control portion 203 is further provided with a notch portion 2032. The notch portion 2032 is formed by recessing a part of the fitting surface portion 2031 in the axial direction of the electric valve. When the valve block 20 abuts against the valve seat assembly 11, the flow control portion 203 is located at the position of the notch portion 2032 and does not contact the fitting surface portion 116 of the valve seat assembly 11. Thus, the fluid medium can flow from the space formed by the notch portion 2032 and the valve seat 111.

[0061] By fitting the flow control portion 203 with the fitting surface portion 116 of the valve seat assembly 11, the notch portion 2032 of the flow control portion 203 corresponds to different positions of the flow regulating portion 117 of the valve seat assembly 11 in the circumferential direction, so that the flow regulating function can be realized.

[0062] The flow regulating process will be described below in combination with Figures 11-13 the following figures. Among them, Figure 11 Fig. 1 is a schematic view of the position relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in the full-closed state, Figure 12 Fig. 2 is a schematic view of the position 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 Fig. 3 is a schematic view of the position relationship between the valve block 20 and the valve seat assembly 11 when the electric valve is in the full-open state.

[0063] As shown in Fig. 1, Figure 11 the fixed gear stop portion 193 of the fixed gear 19 abuts against one side of the planet carrier stop portion 1813. At this time, in the projection view shown in Fig. 1, Figure 11 the projection of the notch portion 2032 of the flow control portion 203 in the axial direction of the electric valve does not overlap with the projection of the flow regulating portion 117 and the valve outlet portion 1131, i.e., the flow regulating portion 117 and the valve outlet portion 1131 are covered by the fitting surface portion 2031, so that the fluid cannot flow out of the notch portion 2032. At this time, the electric valve is in the full-closed state.

[0064] As shown in Fig. 2, Figure 12 after the valve block 20 is rotated counterclockwise by a certain angle, the projection of the notch portion 2032 in the axial direction of the electric valve partially overlaps with the projection of the flow regulating portion 117, i.e., the α area shown in Fig. 2. The α area is a part of the flow regulating portion 117. At this time, the fluid can flow into the valve cavity A of the electric valve through the space formed by the notch portion 2032 and then flow out of the valve outlet portion 1131. At this time, the position of the notch portion 2032 relative to the flow regulating portion 117 determines the flow of the electric valve. Those skilled in the art can understand that Figure 10The 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.

[0065] 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 middle β As shown in the area, the electric valve is at its maximum opening at this time.

[0066] 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.

[0067] In this embodiment, the initial positions of the fixed gear 19 and the valve seat assembly 11 are mainly achieved by the positioning protrusion 194 and the inlet 112.

[0068] For details, please refer to Figure 5 In this embodiment, the fixed gear 19 is further provided with a positioning protrusion 194. The positioning protrusion 194 is generally formed by extending axially along the lower surface of the fixed gear stop 193 toward the valve seat assembly 11. The positioning protrusion 194 can be integrally formed with the fixed gear stop 193 or fixedly connected. For example, the positioning protrusion 194 is in the form of a positioning pin, which is assembled and fixed with the fixed gear stop 193, and the positioning pin protrudes from the lower surface of the fixed gear stop 193. In this embodiment, the fixed gear 19 forms the positioning protrusion 194 and the fixed gear stop 193 during injection molding, that is, the positioning protrusion 194 and the fixed gear stop 193 are integrally injection molded. In addition, please refer to Figures 1-3The lower end of the positioning protrusion 194 is located in the inlet portion 112, and the positioning protrusion 194 does not block the inlet portion 112, that is, the fluid medium can still flow into the valve cavity A through the inlet portion 112.

[0069] Before the valve seat assembly 11 and the fixed gear 19 are assembled and fixed, the positioning protrusion 194 can be inserted into the inlet portion 112, and the lower end of the positioning protrusion 194 is located in the inlet portion 112. At this time, the relative position of the planet carrier stop portion 1813 relative to the valve seat assembly 11 in the circumferential direction can be limited by the inlet portion 112 and the positioning protrusion 194, thereby facilitating the subsequent fixed connection of the valve seat assembly 11 and the fixed gear 19.

[0070] In order to more accurately limit the relative position of the fixed gear 19 relative to the valve seat assembly 11 in the circumferential direction, the positioning protrusion 194 can be arranged to abut the wall surface of the inlet portion 112 when the positioning protrusion 194 is inserted into the inlet portion 112, that is, after the positioning protrusion 194 is inserted into the inlet portion 112, the fixed gear 19 cannot be deflected relative to the valve seat assembly 11.

[0071] In the embodiment, part of the outer contour of the positioning protrusion 194 is circular, which can abut the wall surface of the inlet portion 112, and part of the outer contour of the positioning protrusion 194 is linear, and the gap between the part and the wall surface of the inlet portion 112 can be used for the fluid medium to enter the valve cavity A.

[0072] In the background art, it is usually necessary to provide an opening in the valve seat 1111 to accommodate the positioning protrusion 194 to determine the relative position of the fixed gear 19 relative to the valve seat assembly 11 in the circumferential direction. The machining of the opening is time-consuming and costly. In the present application, the opening is ingeniously combined with the inlet portion 112, thereby eliminating the process of machining the opening to accommodate the positioning protrusion 194, reducing the cost, and improving the machining efficiency. The inlet portion 112 can simultaneously realize the flow of the fluid medium, the determination of the relative position of the fixed gear 19 relative to the valve seat assembly 11 in the circumferential direction.

[0073] When the electric valve is working, the fluid medium (for example, refrigerant) flowing in from the first connecting pipe 114 can impact the gears and other parts in the electric valve, which can affect the service life and performance of the product.

[0074] In order to reduce the adverse effects of the impact of the fluid medium on the gears and other parts in the electric valve, the electric valve provided in the embodiment is provided with a fixed gear stop portion 193, and the projection of the fixed gear stop portion 193 in the axial direction of the electric valve at least covers part of the valve inlet portion 1121.

[0075] Through the above setting, the fluid medium flowing into the valve cavity A from the inlet portion 112 will at least partially impact the fixed gear stop portion 193, and thus 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 can increase the service life and performance of the product.

[0076] Of course, when the projection of the fixed gear stop portion 193 covers the entire inlet portion 112 towards the valve seat assembly 11, theoretically more impact force of the fluid medium will be absorbed by the fixed gear stop portion 193, which is better at this time.

[0077] In this embodiment, the fixed gear stop portion 193 includes a covering surface 1931, which is a bottom surface of the fixed gear stop portion 193 covering the inlet portion 112 in the axial direction of the valve body 1, and at this time the distance D1 between the covering surface 1931 and the inlet valve portion 1121 is greater than 0.

[0078] At this time, the fluid medium flowing from the inlet portion 112 can be buffered and dispersed by the distance between the above covering surface 1931 and the inlet portion 112, which can relatively reduce the impact force of the fluid medium on the fixed gear stop portion 193.

[0079] Of course, the positioning protrusion 194 can also be provided in the form of protruding from the lower surface of the fixed gear body portion 191, as long as the positioning protrusion 194 does not affect the rotation of the planetary gear 183.

[0080] In addition, please refer to 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 sun gear large diameter portion 1321 and a sun gear small diameter portion 1322, the sun gear large diameter portion 1321 is substantially the outer edge portion where the addendum circle of the sun gear component 13 is located, and the sun gear small diameter portion 1322 is substantially the inner edge portion where the dedendum circle of the sun gear component 13 is located.

[0081] 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 is engaged with the planetary gear 183, and the sun gear abutting portion 133 abuts against the valve block 20.

[0082] 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 the area between the addendum circle and the dedendum circle of the sun gear component 13 and the projection of the sun gear abutting portion 133 in the axial direction do not have an overlapping area, and the projection surface can be the surface where the upper end surface of the valve seat 111 is located.

[0083] When the outer profile of the sun gear abutting portion 133 is circular, the outer diameter of the sun gear abutting portion 133 is smaller than the diameter of the sun gear small diameter portion 1322.

[0084] During rotation of the sun gear member 13 and the planetary gear assembly 18, the planetary gear assembly 18 can move up and down along the axial direction of the valve body 1.

[0085] Please refer to Figure 7 In order to reduce the occurrence of this situation, the planetary carrier 181 provided in the embodiment further comprises a planetary carrier limiting portion 1814, which is formed in a structure extending circumferentially along the inner edge of the planetary carrier bottom plate 1812 toward the center of the circle. In the embodiment, the planetary carrier limiting portion 1814 is integrally formed with the planetary carrier bottom plate 1812, i.e., the planetary carrier limiting portion 1814 is integrally injection molded with the planetary carrier bottom plate 1812.

[0086] Of course, the planetary carrier limiting portion 1814 and the planetary carrier bottom plate 1812 can also be a structure of separate parts fixedly connected.

[0087] In the axial direction of the electric valve, the projection of the sun gear abutting portion 133 and the projection of the planetary carrier limiting portion 1814 do not overlap, and the projection of the planetary carrier limiting portion 1814 and the projection of the sun gear large diameter portion 1321 overlap.

[0088] When the inner edge of the planetary carrier limiting portion 1814 and the outer edge of the sun gear abutting portion 133 are both circular, the inner diameter of the planetary carrier limiting portion 1814 is greater than the outer diameter of the sun gear abutting portion 133.

[0089] In addition, in the axial direction of the electric valve, the planetary carrier limiting portion and the sun gear gear portion are provided with an axial distance D2.

[0090] Through the above arrangement, under normal circumstances, for example, when the electric valve is not powered, the planetary carrier limiting portion 1814 does not contact the sun gear member 13. When the planetary gear assembly 18 moves a certain distance (D2, in the case where the electric valve is not provided with a gasket or other component) along the axial direction of the valve body 1, the planetary carrier limiting portion 1814 abuts against the gear of the sun gear member 13, which can limit the further upward movement of the planetary gear, thereby increasing the stability of the planetary gear assembly 18 in the electric valve, and also reducing the noise generated by the upward and downward displacement of the planetary gear assembly 18 relative to the fixed gear 19.

[0091] By the above setting, the displacement amount 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 sun gear large diameter part 1321, that is, in the normal state, the planetary carrier limiting part 1814 abuts against the upper end surface of the valve block 20, and when the planetary gear assembly 18 moves a certain distance upward relative to the fixed gear, the planetary carrier limiting part 1814 abuts against the sun gear part 13.

[0092] It is worth noting that the sun gear part 13 abuts against the valve block 20, which includes that the sun gear part 13 directly abuts against the valve block 20, and also includes that the sun gear part 13 indirectly abuts against the valve block 20, and when the sun gear part 13 indirectly abuts against the valve block 20, a gasket or other components can be arranged between the sun gear part 13 and the valve block 20.

[0093] The electric valve provided by the embodiment has the planetary carrier stopping part 1813 and the planetary carrier limiting part 1814 both located on the planetary carrier 181, which not only realizes limiting the starting position and the ending position of the operation of the planetary gear assembly 18, but also reduces the impact of the fluid medium on the gears and other components, thereby reducing noise, increasing the service life and stability of the product, and integrating these functions on the planetary carrier 181, which is also conducive to the miniaturization of the product.

[0094] Please refer to Figures 13-15 , Figure 13 the cross-sectional view of the second embodiment of the electric valve provided by the present application; Figure 14 is Figure 13 the structural view of the valve seat assembly, Figure 15 is Figure 13 the top view of the valve seat assembly.

[0095] In order to facilitate the description of the embodiment, the same reference numerals are used for the components having the same structure and the same function in the first embodiment and the second embodiment, and the description of the components in the first embodiment is also applicable to the second embodiment, and the differences between the first embodiment and the second embodiment will be described in detail below.

[0096] In the embodiment, the structure of the valve seat assembly 11 is slightly different, specifically, the valve seat assembly 11 provided by the 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 pipe 115 can be set to other numbers according to the system needs, for example, 1, 2 or more.

[0097] 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 electric valve fluid medium, and are generally used for connecting with the system pipeline in the refrigeration and heating system of the refrigerator, the refrigerator, the air conditioner and the like.

[0098] The valve seat 111 is generally in a plate structure, and has a valve seat hole portion 1111 arranged at a substantially central position thereof. In the embodiment, the valve seat hole portion 1111 is in a blind hole structure, i.e., the valve seat hole portion 1111 does not penetrate the valve seat 111. After assembly, one end of the valve shaft 14 is inserted into the valve seat hole portion 1111 to be fixed.

[0099] Correspondingly, the valve seat assembly 11 is further provided with an inlet portion 112 and an outlet portion 113. In the embodiment, the number of the outlet portion 113 is also three, same as the number of the second connecting pipe 115. The inlet portion 112 and the outlet portion 113 are both through holes penetrating the upper and lower surfaces of the valve seat 111. The first connecting pipe 114 is fixedly connected with the valve seat 111 through the inlet portion 112, and the second connecting pipe 115 is fixedly connected with the valve seat 111 through the outlet portion 113. In addition, the inlet portion 112 is further provided with an inlet valve port portion 1121. The inlet valve port portion 1121 is a valve port of the inlet portion 112 relatively close to the planetary gear assembly 18. The outlet portion 113 is further provided with an outlet valve port portion 1131. The outlet valve port portion 1131 is a valve port of the outlet portion 113 relatively close to the planetary gear assembly 18. In the embodiment, the number of the outlet valve port portion 1131 is also three, same as the number of the second connecting pipe 115.

[0100] The electric valve provided by the present application is provided with the valve block 20. The valve block 20 is driven by the rotor 12 to rotate circumferentially relative to the valve seat assembly 11. At the same time, the notch portion 2032 of the valve block 20 can pass through the three outlet valve port portions 1131 in turn. When the notch portion 2032 is located at a certain outlet valve port portion 1131, the second connecting pipe 115 corresponding to the outlet valve port portion 1131 is in an open position, and the fluid medium can pass through the second connecting pipe 115. The remaining outlet valve port portions 1131 are covered by the abutting surface portion 2031 of the valve block 20, and the second connecting pipe portions 115 corresponding to the outlet valve port portions 1131 are in a closed position, and the fluid medium cannot pass through the second connecting pipe portions 115.

[0101] Please refer to Figure 17 , Figure 17 for the cross-sectional schematic view of the third embodiment of the electric valve provided by the present application.

[0102] In order to facilitate the description of the embodiment, the same reference numerals are used for the components having the same structure and the same function in the first embodiment and the third embodiment. The description of the components in the first embodiment is also applicable to the third embodiment. The differences between the first embodiment and the third embodiment will be described in detail below.

[0103] In the embodiment, the positioning protrusion 194 is substantially cylindrical, the diameter of the positioning protrusion 194 is substantially the same as the diameter of the inlet portion 112, the lower end of the positioning protrusion 194 is located in the inlet portion 112, and in addition, the positioning protrusion 194 is provided with a vertical hole and a side hole, the vertical hole extends upward from the bottom of the positioning protrusion 194, the side hole extends inward from the side of the positioning protrusion 194, and the vertical hole and the side hole are communicated, so that the fluid medium entering from the inlet portion 112 can first enter the vertical hole and then enter the valve cavity A through the side hole.

[0104] Please refer to Figure 18 , Figure 18 The structural schematic diagram of the fourth embodiment of the electric valve provided by the application shows the structure of the planet carrier and the valve block.

[0105] In order to facilitate the description of the embodiment, the same reference numerals are used for the components having the same structure and the same function in the first embodiment and the fourth embodiment, and the description of the components in the first embodiment is also applicable to the fourth embodiment, and the differences from the first embodiment will be described in detail below.

[0106] In the embodiment, the planet carrier 181 and the valve block 20 are integrally formed, that is, the planet carrier 181 and the valve block 20 are integrally injection molded when processed. The integrally injection molding of the planet carrier 181 and the valve block 20 can save the process of separately processing and then fixing and assembling the planet carrier 181 and the valve block 20, can form the planet carrier 181 and the valve block 20 at the same time, has higher production efficiency, and has relatively lower cost.

[0107] It should be noted that the terms of directions such as up, down, left and right mentioned in the application are based on the drawings of the specification and are introduced for the convenience of description, and the ordinal numbers such as first and second in the names of components are also introduced for the convenience of description and do not mean any limitation on the order of the components. In addition, in each embodiment described in the specification, each embodiment for a certain component or assembly can be combined in a manner provided with a combination condition, and is not limited to the technical features described in the embodiment, such as the above-mentioned specific embodiment of the first plate-shaped part, which can be combined with other embodiments of the fixed gear in various ways to form a new embodiment. Limited by the length of the specification, all technical solutions obtained by arranging and combining each different technical feature cannot be described as an embodiment, but those skilled in the art should understand that the new technical solutions formed by combining the technical features without creative labor (such as only making adaptive structural adjustment in the combination of two assemblies or components) are within the protection scope of the claims of the application.

[0108] The "abutment" described in the application includes direct abutment of two components and indirect abutment of two components.

[0109] The electric valve provided by the present application is described in detail above. The principle and implementation mode of the present application are described by applying specific examples in this paper, and the above description of the examples is only used to help understand the core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An electric valve, characterized in that, It includes a coil and a valve body (1), the coil being sleeved on the valve body (1), the valve body (1) including a valve seat assembly (11), a valve shaft (14), a sun gear assembly (13), a planetary gear assembly (18), and a valve block (20). The valve seat assembly (11) includes a valve seat (111), the valve seat (111) includes a valve seat hole (1111), one end of the valve shaft (14) is located inside the valve seat hole (1111), and the valve shaft (14) is fixedly connected to the valve seat (111). The planetary gear assembly (18) includes a planet carrier (181), the planet carrier (181) includes a planet carrier base plate (1812), and the planet carrier base plate (1812) is provided with through holes penetrating its upper and lower surfaces; The valve block (20) includes a valve block through hole (201) that penetrates the upper and lower surfaces of the valve block (20). The valve block (20) and the planetary carrier (181) are integrally injection molded; the valve shaft (14) passes through the through hole of the valve block (201) and the through hole of the planetary carrier base plate (1812); the valve block (20) is supported on the valve seat (111). The sun gear component (13) includes a sun gear part (132) and a sun gear pressing part (133). The planet carrier (181) includes a planet carrier limiting part (1814). In the axial direction of the electric valve, the projections of the sun gear pressing part (133) and the planet carrier limiting part (1814) on the plane where the cross-section of the electric valve is located do not overlap. The projections of the planet carrier limiting part (1814) and the sun gear part (132) on the plane where the cross-section of the electric valve is located overlap. The planet carrier limiting part (1814) and the sun gear part (132) can abut against each other. The sun gear pressing part (133) abuts against the valve block (20).

2. The electric valve according to claim 1, characterized in that, The planetary gear assembly (18) includes a planetary gear (183) and a planetary gear shaft (184). The planetary gear shaft (184) is fixedly connected to or integrally formed with the planetary carrier base plate (1812). The through hole of the planetary gear (183) passes through the planetary gear shaft (184). The sun gear component (13) passes through the valve shaft (14). The planetary gear (183) meshes with the sun gear part (132). The sun gear component (13) abuts against the valve block (20).

3. The electric valve according to claim 1, characterized in that, It also includes a housing component (15), a bushing (16), and a spring (17). The housing component (15) is fixedly connected to the valve seat assembly (11). The bushing (16) is located inside the housing component (15). A through hole or a blind hole is provided at approximately the center position of the bushing (16). One end of the valve shaft (14) is located in the through hole or the blind hole. The spring (17) is sleeved on the valve shaft (16). One end of the spring (17) abuts against the valve shaft (16), and the other end of the spring (17) abuts against the valve block (20).

4. The electric valve according to claim 3, characterized in that, The electric valve includes a fixed gear (19), the fixed gear (19) includes a fixed gear stop (193), the planetary carrier (181) includes a planetary carrier stop (1813), and the planetary carrier stop (1813) protrudes from the lower surface of the planetary carrier base plate (1812). The furthest distance between the planetary carrier stop (183) 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).

5. The electric valve according to claim 4, characterized in that, 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 an integral structure. The fixed gear connecting part (192) is connected to the valve seat assembly (11). The fixed gear (19) further includes a positioning protrusion (194), the valve seat assembly (11) includes an inlet (112), a portion of the positioning protrusion (194) is located inside the inlet (112), and the positioning protrusion (194) does not block the inlet (112).

6. The electric valve according to claim 5, characterized in that, The positioning protrusion (194) protrudes from the lower surface of the fixed gear stop (193).

7. The electric valve according to claim 6, characterized in that, The fixed gear stop (193) includes a covering surface (1931), and the inlet (112) is provided with a valve inlet (1121). Along the axial direction of the valve body (1), the covering surface (1931) is the portion of the fixed gear stop (193) that covers the valve inlet (1121) with the projection of the fixed gear stop (193) toward the valve seat assembly (11). The distance D1 between the covering surface (1931) and the valve inlet (1121) is greater than 0.

8. The electric valve according to claim 5, characterized in that, The positioning protrusion (194) protrudes from the lower surface of the fixed gear body (191).

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