Electric valve and manufacturing method

Abstract

An electric valve includes a valve seat assembly, a valve shaft, a sleeve component, a rotor, a sun gear, a planetary gear set, a fixed gear, and a gear slider; the valve seat assembly includes a first plate body, a second plate body, a third plate body, a first connecting pipe, and a second connecting pipe; the rotor is fixedly connected or limitedly connected to the sun gear; the valve shaft is passed through the sun gear, the planetary gear set, and the gear slider, and is fixedly connected or limitedly connected to the valve seat assembly; the fixed gear includes a fixed gear body and a fixed gear bracket, and the fixed gear bracket is fixedly connected to the valve seat assembly; the gear slider includes a slider gear part and a flow control part, the planetary gear set includes a planetary gear, and the planetary gear includes a large diameter gear and a small diameter gear, the large diameter gear is meshed with the fixed gear and the sun gear, and the small diameter gear is meshed with the slider gear part. The present invention also provides a method for manufacturing an electric valve.

Description

Technical Field

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

[0002] Refrigerator and other refrigeration equipment are widely used in various occasions. Take refrigerator as an example. Each temperature zone of the refrigerator is controlled according to a certain interval of preset temperature, that is, intermittent refrigeration. When the preset temperature is reached, the compressor stops; when the actual temperature of the temperature zone is higher than the preset temperature, the compressor starts to refrigerate, so that the temperature of the temperature zone reaches the preset temperature. Every time the compressor is stopped and restarted, a large startup power consumption will be generated, and at the beginning of each startup, the high-temperature refrigerant will enter the evaporator first to heat up first. After reaching the conditions of the refrigeration cycle, refrigeration will be carried out. Throttling is achieved by capillary tube. Summary of the invention

[0003] One embodiment of the present invention aims to provide an electric valve that can achieve accurate adjustment of refrigerant in a refrigeration system such as a refrigerator. To this end, one embodiment of the present invention adopts the following technical solution:

[0004] An electric valve, characterized in that it comprises a valve body, wherein the valve body comprises a valve seat assembly, a valve shaft, a sleeve component, a rotor, a sun gear, a planetary gear set, a fixed gear, and a gear slider;

[0005] The valve seat assembly comprises a first plate body, a second plate body, a third plate body, a first connecting pipe and a second connecting pipe, wherein the first plate body is fixedly connected to the second plate body, and the third plate body is fixedly connected to the second plate body;

[0006] The sleeve component is welded and fixed to the valve seat assembly;

[0007] The rotor is fixedly connected or position-limitedly connected to the sun gear, and the valve shaft passes through the sun gear, the planetary gear set, and the gear slider, and is fixedly connected or position-limitedly connected to the valve seat assembly;

[0008] The fixed gear comprises a fixed gear body and a fixed gear bracket, and the fixed gear bracket is fixedly connected to the valve seat assembly;

[0009] The gear slider includes a slider gear part and a flow control part, and the flow control part is in contact with the valve seat assembly and can rotate relative to the valve seat assembly;

[0010] The planetary gear set includes planetary gears, and the planetary gears include large-diameter gears and small-diameter gears. The large-diameter gears are meshed with the fixed gear and the sun gear, and the small-diameter gears are meshed with the slider gear portion.

[0011] On this basis, the present invention also provides a method for manufacturing an electric valve.

[0012] The electric valve provided in the embodiment of the present invention adopts a planetary gear reduction system, a fixed gear and a gear slider, and can achieve relatively precise regulation of the refrigerant flow of a refrigeration system such as a refrigerator compared to the capillary throttling method. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A cross-sectional schematic diagram of an embodiment of the present invention;

[0014] Figure 2 A schematic cross-sectional view of a valve seat assembly structure provided in one embodiment of the present invention;

[0015] Figure 3 An exploded view of a valve seat assembly provided in one embodiment of the present invention;

[0016] Figure 4 A top view of a valve seat assembly provided in one embodiment of the present invention;

[0017] Figure 5 A schematic diagram of a fixed gear structure provided in a first embodiment of the present invention;

[0018] Figure 6 This is a schematic diagram of the front view appearance of the gear slider provided by the first embodiment of the present invention;

[0019] Figure 7 A schematic diagram of the appearance of a gear slider from a reverse perspective provided in the first embodiment of the present invention;

[0020] Figure 8 A schematic structural diagram of a planetary gear set provided in a first embodiment of the present invention;

[0021] Fig. 9 It is a schematic diagram of the position relationship between the gear slider and the valve seat assembly when the electric valve is in a fully closed state;

[0022] Fig.10 It is a schematic diagram of the position relationship between the gear slider and the valve seat assembly when the electric valve is in the intermediate state of flow regulation;

[0023] Fig.11 It is a schematic diagram of the position relationship between the gear slider and the valve seat assembly when the electric valve is in a fully open flow state;

[0024] Fig.12 This is a schematic structural diagram of the third plate portion 113 of the first embodiment of the present invention;

[0025] Fig.13 It is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention;

[0026] Fig.14 for Fig.13 A three-dimensional schematic diagram of the first plate body;

[0027] Fig.15 It is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention;

[0028] Fig.16 for Fig.15 A three-dimensional schematic diagram of the second plate body;

[0029] Fig.17 A cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention;

[0030] Fig.18 A schematic structural diagram of another embodiment of the present invention;

[0031] Fig.19 yes Fig.18 A schematic diagram of the structure of the fixed gear bracket;

[0032] Fig. 20 yes Fig.18 Schematic diagram of the matching process between the fixed gear and the valve seat assembly;

[0033] Fig.21 yes Fig.18 Schematic diagram of the cross section after the fixed gear and valve seat assembly are assembled. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] The rotor 12 is fixedly connected to the sun gear 13, so that when the rotor 12 rotates, it can drive the sun gear 13 to rotate synchronously. In this embodiment, the rotor 12 and the sun gear 13 are fixedly connected. Of course, they can also be set as a limit connection, as long as the rotor 12 can drive the sun gear 13 to rotate together. The sun gear 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 13 can rotate freely 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 fixedly connected to the shaft sleeve provided at the top of the valve body or directly to the housing. In this way, the valve shaft 14 can provide good concentricity for the rotation of the rotor 12 and the sun gear 13.

[0037] The electric valve includes a sleeve component. In the present embodiment, the sleeve component includes a first sleeve component 151 and a second sleeve component 152. The first sleeve component 151 is generally in the shape of a sleeve with one end open, and can be made of stainless steel, and has a first top wall portion 1511 and a first side wall portion 1512. The second sleeve component 152 is generally in the shape of a sleeve with both ends open, and can also be made of stainless steel, and has a second top wall portion 1521 and a second side wall portion 1522. The diameter of the second side wall portion of the second sleeve component is greater than the diameter of the first side wall portion of the first sleeve component, so that the lower end portion of the first sleeve component 151 is fixedly matched with the top wall portion of the second sleeve component 152, for example, by welding. The lower end edge portion of the second side wall portion 1522 of the second sleeve component 152 is fixedly connected to the valve seat assembly 11, for example, by welding. Of course, the attached Figure 1 As a specific embodiment, a specific structure and connection method of the first sleeve component and the second sleeve component are shown. Those skilled in the art can also make certain changes. For example, the second sleeve component 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 sleeve component, and then fixedly connected to the second sleeve component, and the above connection relationship can also be achieved. Alternatively, the first sleeve component and the second sleeve component are no longer distinguished, but are made into an integrally formed sleeve component, such as using a metal plate to be stamped and formed at one time, so that 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 are formed at the same time, which can also achieve the purpose of the present invention. The way in which the first sleeve component and the second sleeve component are connected in this embodiment is only a specific implementation method and cannot be understood as a limitation on the scope of protection.

[0038] A protrusion 1511a is provided at the center of the top wall 1511 of the first sleeve member, and the protrusion 1511a protrudes outward, so that a recess is formed inside the top wall 1511. One end of the sleeve 16 is limited or fixedly connected to the valve shaft 14, and the other end of the sleeve 16 cooperates with the protrusion 1511a. Figure 1 As shown, the upper end of the sleeve 16 is located in the recessed portion formed by the raised portion 1511a to ensure that the axis of the valve shaft roughly coincides with the central axis of the valve body. A spring 17 is provided between the sleeve 16 and the sun gear 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 sun gear 13. The spring 17 can provide a certain preload force to the sun gear 13 to restrict the sun gear 13 from excessive upward displacement. It should be noted that in this embodiment, in the connection mode between the sun gear 13 and the rotor 12, the lower end of the spring abuts against the sun gear, and since the sun gear and the rotor can be regarded as a component, there are multiple structural combinations, so it can also be set so that the lower end of the spring abuts against the rotor.

[0039] In the valve cavity roughly surrounded by the first sleeve component, the second sleeve component, and the valve seat component, a planetary gear assembly 18, a fixed gear 19, and a gear slider 20 are also arranged. The main working principle is: the rotor and the sun gear rotate to drive the planetary gears of the planetary gear assembly to rotate, and the planetary gears rotate while driving the gear slider to rotate, so as to change the position of the gear slider relative to the valve seat component to achieve the purpose of controlling the flow. The following will introduce the structure and connection or matching relationship of the valve seat component, the planetary gear assembly, the fixed gear, and the gear slider.

[0040] Please refer to Figure 2 , Figure 3 , Figure 4 ,in, Figure 2 is a schematic cross-sectional view of the valve seat assembly structure provided in this embodiment, Figure 3 An exploded view of the valve seat assembly provided in this embodiment, Figure 4: is a top view of the valve seat assembly provided in this embodiment. The valve seat assembly 11 provided in this embodiment includes a first plate body 111, a second plate body 112, a third plate body 113, a first connecting pipe 114, a second connecting pipe 115, and a columnar portion 116. The first plate body 111, the second plate body 112, and the third plate body 113 are arranged in sequence from bottom to top along the axial direction. The first plate body 111, the second plate body 112, the third plate body 113, 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 or outflow channel of the fluid medium of the electric valve, and are generally used for installation in refrigerators, freezers, air conditioners and other refrigeration and heating systems and connection with system pipelines. In the valve seat assembly 11, the third plate body 113 is located at the top, and the third plate body 113 and the first plate body 111 are respectively fixedly connected to the upper and lower surfaces of the second plate body 112.

[0041] The first plate body 111 is generally in a plate-like structure, and has a first hole 1111 arranged in the center. In this embodiment, the first hole 1111 is a blind hole structure, that is, it does not penetrate the first plate body 111. After assembly, the valve shaft 14 is inserted into the first hole 1111 and fixed. The first pipe installation part 1112 and the second pipe installation part 1113 are also provided on both sides of the central part. The first pipe installation part 1112 and the second pipe installation part 1113 are through holes penetrating the upper and lower surfaces of the first plate body 111. The first pipe 114 is fixedly connected to the first plate body 111 through the first pipe installation part 1112, and the second pipe 115 is fixedly connected to the first plate body 111 through the second pipe installation part 1113. Since the second plate body 112 is arranged above the first plate body 111 and the two are tightly fitted, the second plate body can play a positioning role when installing the first pipe and the second pipe, that is, the first pipe 114 is inserted into the first pipe installation part 1112 and abuts against the second plate body 112, thereby ensuring the insertion depth. The outer edge of the first plate body is provided with a first step part 1114. During assembly, the second side wall part 1522 of the second sleeve component can abut and cooperate with the first step part 1114, and can be fixedly connected by welding.

[0042] The second plate body 112 is generally in a plate-like structure, and has a second hole 1124 arranged at the center. The second hole 1124 is a through hole that penetrates the second plate body 112. After assembly, the second hole 1124 and the first hole 1111 are generally coaxially arranged. The valve shaft is inserted into the second hole 1124 and then inserted into the first hole 1111 for fixing. A first guide groove 1122 and a second guide groove 1123 are also arranged on both sides of the center of the second plate body 112. In this embodiment, the first guide groove 1122 guides the outlet of the throttled fluid, and the second guide groove 1123 guides the fluid flowing into the electric valve, that is, after the fluid flows into the second connecting pipe 115, it enters the valve cavity through the cavity formed by the second guide groove 1123, and after throttling (the specific throttling process is described below), it enters the first connecting pipe 114 through the cavity formed by the first guide groove 1122 and flows out of the electric valve. The first guide groove portion 1122 and the first pipe installation portion 1112 of the first plate-shaped portion 111 have an intersecting portion in the axial projection, so that the fluid can flow from the cavity formed by the first guide groove portion 1122 to the first pipe 114; at the same time, the second guide groove portion 1123 and the second pipe installation portion 1113 of the first plate-shaped portion 111 have an intersecting portion in the axial projection, so that the fluid can flow from the second pipe into the cavity formed by the second guide groove portion 1123. Among them, the first guide groove portion 1122 is a hole-shaped structure and passes through the second plate body portion 112. When the first plate body portion 111, the second plate body portion 112, and the third plate body portion 113 are assembled, the fluid in the cavity formed by the first guide groove portion 1122 cannot flow out of the second plate body portion along the radial direction of the second plate body portion 112. The second guide groove portion 1123 is a groove-shaped structure that passes through the second plate body portion. The upper end surface of the second guide groove portion 1123 is covered by the third plate-shaped portion 113. The fluid flowing in from the second connecting pipe 115 can only flow into the valve cavity of the electric valve along the radial direction of the second plate body portion 112 (i.e., the extension direction of the second guide groove portion 1123).

[0043] The outer diameter of the second plate body 112 is smaller than that of the first plate body 111, so that a second step 1118 is formed at the edge of the two, and the fixed gear 19 described below is installed on the valve seat assembly 11 through the second step 1118. At the same time, the outer edge of the second plate body 112 is provided with a positioning groove 1121, and correspondingly, the inner peripheral wall of the fixed gear 19 is provided with a protrusion 1921, and the protrusion 1921 cooperates with the positioning groove 1121 to achieve the circumferential positioning of the fixed gear 19 and the second plate body 112, that is, the fixed gear 19 cannot rotate relative to the second plate body 112.

[0044] The third plate body 113 is generally in a plate-like structure. Figure 3The figure is a reference, the top of the third plate body 113 is a mating surface 1134, and the bottom surface of the gear slider described below can be rotated in close contact on the mating surface 1134. The third plate body 113 has a third hole 1133 arranged at the center, and the third hole 1133 is a through hole that penetrates the third plate body 113. After assembly, the third hole 1133 is substantially coaxial with the first hole 1111 and the second hole 1124. The valve shaft 14 is inserted into the third hole 1133, the second hole 1124, and the first hole 1111 in sequence and then fixed. The third plate body 113 is provided with a flow regulating part 1131 and a valve port 1132. The flow regulating part 1131 is provided on the mating surface 1134 of the third plate body 113 and is recessed inwardly to form a groove structure that does not penetrate the third plate body. One end of the groove is connected to the valve port 1132. The valve port 1132 forms a flow hole that penetrates the third plate body. The fluid can flow along the flow regulating part 1131 and flow out from the flow hole of the valve port 1132. The specific structure of the flow regulating part 1131 will be described below.

[0045] There are many ways to fix the first plate body 111 and the second plate body 112. For example, the first plate body 111 and the second plate body 112 are welded, or the first plate body 111 and the second plate body 112 are glued.

[0046] When the first plate body 111 and the second plate body 112 are fixedly connected by welding, a solder receiving portion 1125 may be provided on the second plate body 112. Specifically, the solder receiving portion 1125 is a through hole penetrating the second plate body 112. Figure 3 In the present embodiment, the number of solder receiving portions 1125 is 2. When performing the welding operation on the first plate body 111 and the second plate body 112, the first plate body 111 and the second plate body 112 can be first fixed by a fixture, and then the solder can be placed in the solder receiving portion 1125. At this time, the solder is supported on the upper surface of the first plate body 111, and then the first plate body 111 and the second plate body 112 are fixedly connected by furnace welding or the like. At this time, the solder can be diffused between the first plate body 111 and the second plate body 112 through the edge of the solder receiving portion 1125, so that the solder between the first plate body 111 and the second plate body 112 is more uniform and the area between the first plate body 111 and the second plate body 112 that is not filled with solder is small.

[0047] Of course, the solder accommodating portion 1125 is not limited to the form of a through hole passing through the second board body portion 112. For example, the solder accommodating portion 1125 can be in the form of a notch formed around the second board body portion 112. In this case, the solder between the first board body portion 111 and the second board body portion 112 can also be made more uniform and the area between the first board body portion 111 and the second board body portion 112 that is not filled with solder can be smaller.

[0048] The valve seat assembly 11 provided in this embodiment can process the first plate body 111 and the second plate body 112 separately and then fix them together, which can relatively reduce the processing difficulty and cost of the valve seat assembly 11 .

[0049] There are also various ways to fix the third plate body 113 and the second plate body 112. For example, the third plate body 113 and the second plate body 112 are welded, or the third plate body 113 and the second plate body 112 are glued.

[0050] In order to ensure that the first plate body portion 111, the second plate body portion 112 and the third plate body portion 113 maintain a fixed relative position in the axial direction, for example, to make the first pipe mounting portion 1112 and the first guide groove portion 1122 and the valve mouth portion 1132 basically maintain on the same axis, a through first positioning portion 1115 can be provided on the first plate-like portion 111, a through second positioning portion 1126 can be provided on the second plate-like portion 111, and a through third positioning portion 1135 can be provided on the third plate-like portion 113. Specifically, the first positioning portion 1115 and the second positioning portion 1126 are generally in the shape of through holes, the third positioning portion 1135 is in the shape of a notch, the columnar portion 116 penetrates from the third positioning portion 1135, passes through the second positioning portion 1126 and the first positioning portion 1115 in sequence, and extends out of the lower end surface of the first plate body 111. More specifically, the columnar portion 116 can be fixedly connected to the first plate body 111, the second plate body 112, and the third plate body 113 by welding. While the columnar portion 116 serves as a positioning component, the portion extending out of the first plate body 111 can also serve as a fixing component of the electromagnetic coil.

[0051] The first plate body 111 , the second plate body 112 , the third plate body 113 , the first connecting pipe 114 , the second connecting pipe 115 and the columnar portion are fixedly connected to form a valve seat assembly.

[0052] Please refer to Figure 5 , Figure 51 is a schematic diagram of the fixed gear structure provided by the first embodiment of the present invention. The fixed gear 19 is roughly cylindrical and has a large diameter portion 191 and a small diameter portion 192, wherein the height of the large diameter portion 191 in the axial direction is lower than the height of the small diameter portion 192 in the axial direction, so that a step portion 193 is formed between the large diameter portion 191 and the small diameter portion 192, and the step portion 193 is formed by the bottom wall of the large diameter portion 191 and the inner circumferential wall of the small diameter portion 192. The large diameter portion 191 has a fixed gear top wall portion 1911 and a fixed gear portion 1912, wherein the fixed gear top wall portion 1911 is abutted by the second top wall portion 1521 of the sleeve component after assembly to achieve the fixed gear in the axial direction. The fixed gear portion 1912 is used to mesh with the planetary gear 18 described below.

[0053] The inner peripheral wall of the small diameter portion 192 is also provided with a protrusion 1921, which is in the shape of a strip and extends along the axial direction of the fixed gear until it reaches the bottom wall of the small diameter portion 192. Of course, in actual processing, it is not necessary to be flush with the bottom wall of the small diameter portion 192. For example, the end of the protrusion 1921 is spaced a certain distance from the bottom wall of the small diameter portion 192, but at least it is ensured that after assembly, the end of the protrusion 1921 is not higher than the top surface of the second plate body 112. As mentioned above, the outer edge of the second plate body 112 is provided with a positioning groove 1121, so that during assembly, the bottom wall 193 of the fixed gear 19 abuts against the first plate body 111, and the protrusion 1921 is inserted into the positioning groove 1121, so that the fixed gear 19 is positioned in the circumferential direction, that is, the fixed gear 19 cannot rotate relative to the second plate body 112.

[0054] In order to further ensure that the fixed gear 19 is in contact with the sleeve assembly, the impact on the fixed gear part 1912 is reduced, the fixed gear 19 can also be provided with a pressing portion 194 on the outer edge of the top wall part 1911. The pressing portion 194 is higher than the top wall part 1911 and is generally annular. In this way, when the fixed gear abuts with the sleeve component, the second top wall part 1521 will abut with the pressing portion 194, thereby limiting the fixed gear 19 in the axial direction. In order to prevent the sleeve component from causing the fixed gear to deform when abutting against the pressing portion 194 and affecting the meshing accuracy of the fixed gear part 1912, a groove portion 195 can be provided on one side of the pressing portion 194 close to the central axis. In this embodiment, the cross-sectional shape of the groove portion 195 is triangular. In this way, even if the sleeve component applies a relatively large force to the pressing portion 194 during the assembly process, it will not have a serious impact on the fixed gear part 1912. Of course, the cross-sectional shape of the groove portion 195 is not limited to a triangle, and those skilled in the art can understand that any groove portion 195 of any shape that can relatively separate the pressing portion 194 from the fixed gear portion 1912 can be applied to the present embodiment.

[0055] The fixed gear 19 can be integrally molded by plastic injection molding, such as polymer material injection molding. The fixed gear positioning structure provided in this embodiment has one end abutting against the second plate body 112, and the pressing portion 194 at the other end abutting against the second top wall portion 1521 of the sleeve component to achieve circumferential and axial positioning of the fixed gear in the electric valve, and the assembly is relatively simple. The protrusion 1921 provided on the fixed gear can not only achieve circumferential positioning with the positioning groove 1121 of the second plate body 112, but also control the rotation range of the gear slider 20.

[0056] Please refer to Figure 6 , Figure 7 , Figure 6 1 is a schematic diagram of the front view of the gear slider provided by the first embodiment of the present invention. Figure 7 : is a schematic diagram of the appearance of the gear slider provided by the first embodiment of the present invention from the reverse side. The gear slider 20 is generally cylindrical with a bottom, including a main body 201 and a positioning portion 202 protruding from the outer edge of the main body 201. The cross section of the positioning portion 202 is generally fan-shaped and is coaxially arranged with the main body 201, that is, the outer diameter of the positioning portion 202 is greater than the outer diameter of the main body 201, so that the positioning portion 202 forms two ends, namely a first positioning portion 2021 and a second positioning portion 2022. The gear slider 20 also includes a through hole portion 204 arranged at its center. The valve shaft 14 passes through the through hole formed by the through hole portion 204 and is fixedly connected to the valve seat assembly. Therefore, the gear slider 20 can rotate around the valve shaft 14. After assembly, the gear slider 20 is coaxially arranged with the fixed gear 19, and the distance between the peripheral wall of the positioning portion 202 and the central axis matches the distance between the protrusion 1921 of the fixed gear and the central axis, that is, when the gear slider 20 rotates to the extreme position in the clockwise direction as shown in the figure, the first positioning portion 2021 abuts against one side of the protrusion 1921, so that the gear slider cannot continue to rotate; when the gear slider 20 rotates to the extreme position in the counterclockwise direction as shown in the figure, the second positioning portion 2022 abuts against the other side of the protrusion 1921, so that the gear slider cannot continue to rotate. In this way, the rotation stroke of the gear slider is determined by the cooperation of the positioning portion 202 and the protrusion 1921. It should be noted that the length of the positioning portion 202 (i.e., the length along the circumferential direction of the gear slider) can be adjusted according to the needs of the system.

[0057] The inner peripheral wall of the gear slider 20 is provided with a slider gear portion 203, and the slider gear portion 203 can mesh with the planetary gear assembly described below. and The gear slider 20 is driven by the planetary gear to rotate. A flow control unit 205 is provided at the bottom of the gear slider 20. The flow control unit 205 has a certain height as a whole. Figure 7As shown, the flow control portion 205 extends a certain height along the axial direction on the bottom surface of the gear slider 20 to form a fitting surface 2051 for fitting with the matching surface 1134 of the third plate body 113 and being relatively rotatable. At the same time, a notch portion 2052 is provided at a position of the flow control portion 205. In this way, when the gear slider 20 is fitted with the third plate body 113, the flow control portion 205 is located at the notch portion 2052 and does not contact the third plate body 113, and the fluid can flow in or out of the space formed by the notch portion 2052.

[0058] Please refer to Figure 8 , Figure 8 1 is a schematic diagram of the structure of the planetary gear set provided in the first embodiment. The planetary gear set 18 includes a planet carrier 181 and a cover plate 182. The planet carrier 181 includes a bottom 1812 and three support columns 1811 extending upward from the bottom 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. For this reason, 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. The planet carrier 181 and the cover plate 182 are fixedly connected to limit the planetary gears 183 in the axial direction. Specifically, a small hole can be set on the cover plate 182, and the end 18111 of the support column 1811 is extended out of the small hole and then crimped and deformed, thereby achieving a fixed connection. The planet carrier 181 can be made of plastic injection molding, and the cover plate 182 can be made of metal plate 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 three planetary gears 183 are fixed to the planet carrier 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 or limitedly abutted with the bottom 1812 of the planet carrier, and the other end is fixedly connected or abutted with the cover plate 182.

[0059] Taking one of the planetary gears 183 as an example, the planetary gear 183 includes two-stage gears, namely, a large diameter gear 1831 located at the relatively upper end and a small diameter gear 1832 located at the relatively lower end. During assembly, the sun gear 13 is inserted downward from the central axis of the planetary gear set 18 and meshes with the large diameter gear 1831, driving the planetary gear 183 to rotate. The three planetary gears 183 form a virtual circle, the inner side of the large diameter gear 1831 meshes with the sun gear 13, and the outer side of the large diameter gear 1831 meshes with the fixed gear portion 1912 of the fixed gear 19. In this way, when the sun gear 13 rotates, it drives the planetary gear 183 to rotate. While the planetary gear 183 rotates around the planetary gear shaft 184, it also rotates along the fixed gear portion 1912 of the fixed gear. The small diameter gear 1832 meshes with the slider gear part 203 of the gear slider 20, thereby driving the gear slider 20 to rotate. The rotation of the gear slider is stopped by the abutment of the first positioning part 2021 and the second positioning part 2022 mentioned above with the protrusion 1921 of the fixed gear. In this way, the electric valve drives the rotor and the sun gear 13 to rotate through the electromagnetic coil, and the gear slider 20 is finally driven to rotate through the planetary gear set. The flow control part 205 set at the bottom of the gear slider fits with the matching surface 1134 of the third plate body 113, so that the notch part 2052 of the flow control part corresponds to different parts of the flow regulating part 1131 of the third plate body, so as to realize the flow regulation function.

[0060] Combine the following Figure 9-11 To illustrate the process of flow regulation. Fig. 9 This is a schematic diagram of the position relationship between the gear slider and the valve seat assembly when the electric valve is in the fully closed state. Fig.10 This is a schematic diagram of the position relationship between the gear slider and the valve seat assembly when the electric valve is in the intermediate state of flow regulation. Fig.11 It is a schematic diagram of the position relationship between the gear slider and the valve seat assembly when the electric valve is in a fully open flow state.

[0061] The gear slider 20 and the third plate body have at least one relative position, and there is no overlapping area between the axial projection of the notch 2052 and the axial projection of the valve port 1132, and between the axial projection of the notch 2052 and the axial projection of the flow regulating portion 1131. Specifically, Fig. 9 As shown, the first positioning portion 2021 of the gear slider 20 abuts against one side of the raised portion 1921 of the fixed gear. Fig. 9 In the projection diagram shown, the notch portion 2052 provided in the flow control portion 2051 has no overlapping part in the axial projection with the flow regulating portion 1131 and the valve mouth portion 1132, that is, the flow regulating portion 1131 and the valve mouth portion 1132 are both closely covered by the flow control portion 2051, and the fluid cannot flow into the flow regulating portion 1131. At this time, the electric valve is in a fully closed state.

[0062] The gear slider 20 and the third plate body 113 have at least one relative position, and the axial projection of the notch 2052 partially overlaps with the axial projection of the flow regulating portion 1131, and the cross-sectional area of ​​the overlapping projections defines the flow of the electric valve. Fig.10 As shown, after the gear slider 20 rotates counterclockwise for a certain angle, the axial projection of the flow control part 2051 partially overlaps with the flow regulating part 1131, namely, the A area shown in the figure. The A area is a part of the flow regulating part 1131. At this time, the fluid in the valve cavity of the electric valve can flow into the space formed by the notch 2052, and flow into the arc groove formed by the flow regulating part 1131 through the A area of ​​the flow regulating part 1131, and then flow out from the valve port 1132. At this time, the cross-sectional area of ​​the A area (the shaded part in the figure) determines the throttling flow of the electric valve. Those skilled in the art can understand that Fig.10 A specific position of the gear slider is shown, and as the gear slider 20 continues to rotate, the cross-sectional area of ​​the corresponding region A will increase progressively. This process is the flow regulation process of the electric valve.

[0063] The gear slider 20 and the third plate body 113 have at least one relative position, and at least part of the projection of the notch 2052 in the axial direction overlaps with the projection of the valve port 1132 in the axial direction. The valve port formed by the valve port 1132 is connected to the internal space of the first connecting pipe 114, and the inner diameter of the valve port 1132 defines the flow rate of the electric valve. Fig.11 As shown, the gear slider 20 rotates counterclockwise until the second positioning portion 2022 abuts against the other side of the protrusion 1921 of the fixed gear, and then stops rotating. At this time, the axial projection of the notch portion 2052 forms an overlapping area with the portion of the flow regulating portion close to the valve port portion and the valve port portion, that is, the valve port portion 1132 is located as a whole at the position where the notch portion 2052 is located. At this time, the fluid in the valve cavity of the electric valve flows into the space formed by the notch portion 2052 and flows out of the valve port portion 1132, as shown in FIG. Fig.11 As shown in area A in the middle, the electric valve is in a fully open state at this time.

[0064] Combine the following Fig.12 The structures of the flow rate adjustment portion 1131 and the valve port portion 1132 provided in the third plate portion 113 will be described. Fig.121 is a schematic diagram of the structure of the third plate body 113. The third plate body 113 is generally in the shape of a flat plate, and a third positioning portion 1135 is provided at the edge of its circumference, which is used to cooperate with the columnar portion 116 to achieve longitudinal positioning between the first plate body, the second plate body, and the third plate body. A third hole portion 1133 is provided at the center of the third plate body 113, which is used to assemble with the valve shaft 14. The valve mouth portion 1132 forms a flow hole that passes through the third plate body, and a valve mouth contour line 1132a is formed on the matching surface 1134. The diameter φ of the valve mouth portion 1132 ranges from 1.2mm<φ<2mm. On one side of the valve mouth portion 1132, an inwardly concave flow regulating portion 1131 is formed on the matching surface 1134. The flow regulating portion 1131 is in the shape of a narrow and long arc groove as a whole, and the edge line of the flow regulating portion 1131 is defined by the first curve 1131a and the second curve 1131b. The first curve 1131a can be an Archimedean spiral or an arc line. One end of the first curve 1131a intersects with the valve mouth contour line 1132a of the valve mouth portion 1132 on the mating surface 1134 at point B. The second curve 1131b can be an Archimedean spiral. One end of the second curve 1131b intersects with the valve mouth contour line 1132a at point C. In this way, the spacing between the first curve 1131a and the second curve 1131b gradually increases along the direction approaching the valve mouth portion 1132. At one end close to the valve mouth portion 1132, the spacing L1 between the first curve 1131a and the second curve 1131b satisfies: 0.5mm<L1<1mm, and at the other end away from the valve mouth portion 1132, the spacing L2 between the first curve 1131a and the second curve 1131b satisfies: 0.05mm<L2<0.15mm. This end can adopt a rounded transition, such as Fig.12 As shown, at the left end of the figure, the first curve 1131a and the second curve 1131b are connected by a third curve 1131c, and the third curve 1131c can be an arc, and the value of its radius R satisfies: 0.1mm<R<0.3mm. In this way, the overall size of the flow regulating part 1131 is relatively small, and compared with the ordinary flow regulating valve with a needle valve structure, it is particularly suitable for precise regulation of small flow, such as refrigerant flow regulation of a refrigerator refrigeration system.

[0065] Furthermore, the depth of the flow regulating portion 1131 can also be set so that the depth of the flow regulating portion 1131 at one end close to the third curve 1131c gradually increases along the extension direction of the flow regulating portion 1131. As a specific implementation method, at one end close to the valve mouth portion 1132, the depth H1 of the flow regulating portion 1131 satisfies: 0.3mm

[0066] ​In actual operation, the width and depth of the flow regulating part 1131 can be set accordingly according to the system flow requirements to meet different needs.

[0067] The assembly process of the electric valve is described below. The valve seat assembly can be assembled and fixed into one assembly first, that is, the first plate body 111, the second plate body 112, the third plate body 113, the first connecting pipe 114, the second connecting pipe 115, and the columnar portion 116 are assembled in sequence and then fixed by welding. The valve shaft 14 can be fixedly connected to the valve seat assembly by welding or by press-fitting. Then, the gear slider is installed, that is, the through hole portion 204 of the gear slider is installed along the valve shaft 14, so that the fitting surface 2051 of the gear slider fits with the matching surface 1134 of the third plate body. Then, the planetary gear set 18 is partially installed into the gear slider 20, and the small diameter gear 1832 of the planetary gear set 18 is meshed with the slider gear portion 203, and the large diameter tooth 1831 is located above the gear slider 20. Then, the fixed gear 19 is installed from the top, so that the protrusion 1921 of the fixed gear is inserted into the positioning groove 1121 of the second plate body, the fixed gear is positioned in the circumferential direction, and the fixed gear part 1912 is meshed with the outer side of the large diameter tooth 1831 of the planetary gear set. Then, the rotor 12 with the sun gear 13, the spring 17, and the sleeve 16 are installed; then the sleeve component is installed. It should be noted that the sleeve component here can be a sleeve component that is assembled into a sleeve component by welding by preparing the first sleeve component and the second sleeve component separately as described in the first embodiment, or a sleeve component can be stamped as a whole. The sleeve component has a first side wall part 1512, a second side wall part 1522, a first top wall part 1511, and a second top wall part 1521. After assembly, the second top wall part 1521 is pressed with the upper edge of the fixed gear 19 by interference, the fixed gear is positioned axially, and the sleeve component is welded and fixed to the valve seat assembly.

[0068] Combine the following Fig.13 , Fig.14 Another embodiment of the valve seat assembly is described, and this structure is conducive to the welding of the valve seat assembly and the sleeve component. Fig.13 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention, Fig.14 yes Fig.13 A three-dimensional schematic diagram of the first plate body.

[0069] As described in the first embodiment, the first plate body 111 and the second plate body 112 can be fixed by welding or gluing. When the first plate body 111 and the second plate body 112 are fixed by welding, a solder receiving cavity is set in the second plate body to penetrate the first plate body, the first plate body 111 and the second plate body 112 are first fixed by a fixture, and then the solder is placed in the solder receiving cavity, and then the solder is melted by furnace welding. At this time, the solder will diffuse outward from the solder receiving cavity along the fitting surface between the first plate body 111 and the second plate body 112 to achieve the purpose of welding and fixing. However, the fitting area between the first plate body 111 and the second plate body 112 is relatively large, and the amount of solder required is relatively large to achieve stable welding quality. However, once too much solder is placed, during furnace welding, there may be excess solder overflowing from the fitting surface between the first plate body 111 and the second plate body 112, and may flow to the matching part of the first plate body 111 and the sleeve component. The sleeve component and the first plate body can be made of the same stainless steel material and welded by laser welding to achieve the purpose of sealing and fixing. If there is solder between the sleeve component and the first plate body, cracks may be generated at the solder during laser welding, resulting in poor sealing of the electric valve and the risk of leakage.

[0070] In order to solve this problem, the structure of the first plate body 111 can be improved, such as Fig.14 As shown, in this embodiment, an annular groove portion 1116 is provided along one side of the first plate body 111 facing the second plate body, and the groove portion 1116 is at least partially covered by the second plate body 112. Specifically, except for the portion corresponding to the second guide groove 1123 of the second plate body 112, the rest is covered by the second plate body 112. That is, a roughly annular space for solder to flow in is formed between the annular groove portion 1116 and the second plate body 112. In this way, during the furnace welding process, after the solder melts, it diffuses outward from the solder receiving cavity, flows along the fitting portion between the first plate body 111 and the second plate body 112, and flows into the roughly annular space formed by the groove portion 1116, so that the solder no longer continues to overflow along the gap between the first plate body 111 and the second plate body 112 to the portion of the first plate body 111 for assembly with the sleeve component. This structure can effectively reduce the welding failure rate between the sleeve component and the valve seat assembly and improve the welding quality of the product. Fig.14 The triangle shown can of course be any other shape suitable for processing. The present embodiment does not limit the specific structure, shape and size of the groove portion 1116 .

[0071] Please refer to Fig.15 , Fig.16 ,in, Fig.15 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention, Fig.16 yes Fig.15 A three-dimensional schematic diagram of the second plate body.

[0072] As another alternative embodiment, the second plate body 112 can also be improved accordingly while the first plate body described in the first embodiment remains unchanged. In this embodiment, an annular groove portion 1127 is provided along one side of the second plate body 112 facing the first plate body 111, and at least most of the groove portion 1127 abuts against the first plate body 111. Specifically, except for the portion corresponding to the second guide groove 1123 and the portion corresponding to the positioning groove portion 1121, the rest of the portions abut against the first plate body 111. That is, a roughly annular space for solder to flow in is formed between the annular groove portion 1127 and the first plate body 111. In this way, during the furnace welding process, after the solder melts, it diffuses outward from the solder containing cavity, flows along the fitting portion between the first plate body portion 111 and the second plate body portion 112, and flows into the roughly annular space formed by the groove portion 1127, so that the solder no longer continues to overflow along the gap between the first plate body portion 111 and the second plate body portion 112 to the portion of the first plate body portion 111 used for assembly with the sleeve component. This structure can also effectively reduce the welding defect rate between the sleeve component and the valve seat assembly, and improve the product welding quality. The projection area of ​​the groove portion 1127 in the axial direction is smaller than the projection area of ​​the second plate body portion 112 in the axial direction. The cross-sectional shape of the groove portion 1127 can be as follows: Fig.16 The triangle shown can of course be any other shape suitable for processing. The present embodiment does not limit the specific structure, shape and size of the groove portion 1127 .

[0073] Please refer to Fig.17 , Fig.17 It is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention.

[0074] As another alternative embodiment, in this embodiment, an annular third step portion 1117 is provided along one side of the first plate body 111 facing the second plate body, and the outer diameter of at least part of the third step portion 1117 is smaller than the outer diameter of the second plate body 112, that is, from the perspective of axial projection, the projection of at least part of the third step portion 1117 is located within the projection of the second plate body 112. Specifically, the third step portion 1117 forms an annular space along the circumferential direction between the first plate body 111 and the second plate body 112, and the annular space can be used for solder to flow in. In this way, during the furnace welding process, after the solder melts, it diffuses outward from the solder receiving cavity, flows along the fitting portion between the first plate body 111 and the second plate body 112, and partially flows into the above-mentioned annular space. Since the flow and penetration of solder is usually formed by capillary action, the annular space formed by the third step portion 1117 and the second plate portion 112 is much larger than the air gap of the capillary action, so after the solder enters the annular space, it will not continue to overflow along the first plate portion 111 to the part of the first plate portion 111 used for assembly with the sleeve component. This structure can also relatively reduce the welding defect rate of the sleeve component and the valve seat assembly, and improve the product welding quality.

[0075] Combine the following Figure 18-21 Another embodiment of the fixed gear and valve seat assembly is described. Figure 18-21 ,in, Fig.18 is a structural schematic diagram of another embodiment of the present invention, Fig.19 yes Fig.18 Schematic diagram of the structure of the fixed gear bracket. Fig. 20 This is a schematic diagram of the matching process between the fixed gear and the valve seat assembly. Fig.21 It is a cross-sectional schematic diagram after the fixed gear and valve seat assembly are assembled.

[0076] The main difference between this embodiment and the first embodiment is the matching mode of the shaft sleeve 160 and the fixed gear 9 and the fixed gear and the valve seat assembly, as well as the difference in the structure of the rotor and the sun gear. The structures of the planetary gears, gear sliders, and other components can be understood with reference to the first embodiment. In order to avoid the text being too long, these components will not be described in detail again. In addition, in order to facilitate the understanding of this embodiment, the same reference numerals are used for the above-mentioned components that are the same or similar in structure and function as the first embodiment.

[0077] like Fig.18As 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. After the drive controller is powered on, a pulse drive signal will be sent to the stator coil, and the stator coil will generate a periodically changing magnetic field, thereby driving the rotor 12 of the electric valve to rotate forward or reverse. The rotor 12 is fixedly connected or limitedly connected with the sun gear 13. The specific limited connection can be provided with one or more grooves in the center hole of the rotor. Correspondingly, a raised rib is provided on the outer edge of the upper end of the sun gear, and then the sun gear 13 is installed from the bottom of the rotor, so that the rib and the groove cooperate to achieve the relative positioning of the two in the circumferential direction, so that the sun gear 13 can rotate with the rotor 12 under the drive of the rotor 12. This embodiment provides a combination of the rotor and the sun gear different from the first embodiment. The sun gear is provided with a through hole 131 passing through its center, and the valve shaft 14 is penetrated through the through hole 131 and fixedly connected with the valve seat assembly.

[0078] The sleeve part includes a first sleeve part 151 and a second sleeve part 152, and the specific structures of the two can refer to the description of the first embodiment. Of course, similar to the first embodiment, the sleeve part can be a combination of the first sleeve part and the second sleeve part 152, or can be stamped and formed by a metal plate. Different from the first embodiment, the top wall part 1511 is roughly flat, and no protrusion 1511a is provided. The sleeve 160 has a pressing surface part 1601 that fits the inner wall of the top wall part 1511, and can achieve planar abutment with the top wall part 1511. The sleeve 160 is also provided with a valve shaft matching part 1602. Specifically, the valve shaft matching part 1602 is a hole provided at the central axis of the sleeve 160, and the upper end of the valve shaft 14 is inserted into the hole to achieve positioning. A spring support portion 1603 is provided on the side of the sleeve 160 close to the rotor. Specifically, the spring support portion 1603 can be a step formed on the outer edge of the sleeve end. One end of the spring 17 abuts against the spring support portion 1603, and the other end abuts against the rotor 12.

[0079] The valve seat assembly 11 includes a first plate body 111, a second plate body 112, and a third plate body 113. The specific structures of the three can refer to the description of the first embodiment and are not repeated here. Among them, the outer edge of the second plate body 112 is provided with a positioning groove 1121, which is used to achieve matching positioning with the bracket positioning portion 922 provided on the fixed gear bracket described below.

[0080] The fixed gear 9 includes a fixed gear body 91 and a fixed gear bracket 92. Fig.19As shown, the fixed gear bracket 92 includes a bracket body 921 and a bracket positioning portion 922 extending downward from the bracket body 921. Specifically, the fixed gear bracket 92 is generally in the shape of a thin-walled hollow cylinder, and has a bracket upper end face 926 and a bracket lower end face 925, wherein the bracket lower end face 925 abuts against the upper end face of the second plate body 112 after assembly, and the bracket positioning portion 922 extends outward from the bracket lower end face 925 and protrudes from the surface of the bracket lower end face 925, and is inserted into the positioning groove portion 1121 provided on the outer edge of the second plate body 112 to achieve the relative position fixation of the fixed gear bracket 92 and the second plate body 112. The two can be fixedly connected by laser welding.

[0081] A protrusion 924 is provided on the inner peripheral wall of the fixed gear bracket 92, near the bracket positioning portion 922. In this embodiment, the bracket positioning portion 922 is located in the extension direction of the protrusion 924. Of course, the bracket positioning portion 922 can also be set at another position of the bracket lower end surface 925, not aligned with the protrusion 924. The protrusion 924 can be used to abut against the first positioning portion 2021 and the second positioning portion 2022 of the gear slider to limit the rotation stroke of the gear slider.

[0082] The outer peripheral wall of the fixed gear bracket 92 can be a cylindrical shape with equal diameter, and the inner peripheral wall can be set to a structure with a large inner diameter at the upper end and a small inner diameter at the lower end, such as Fig.19 , 20 As shown, the inner circumferential wall of the fixed gear bracket is provided with a bracket step portion 923 above the protrusion 924, the inner circumferential wall above the bracket step portion is defined as a first inner circumferential wall 929, and the inner circumferential wall below the bracket step portion is defined as a second inner circumferential wall 928, and the inner diameter of the first inner circumferential wall 929 is greater than the inner diameter of the second inner circumferential wall 928. In this way, the fixed gear body 91 described below has an outer diameter matching the first inner circumferential wall 929, and after assembly, it can abut against the bracket step portion 923 to achieve the relative positioning of the fixed gear body 91 and the fixed gear bracket 92 in the axial direction.

[0083] The fixed gear body 91 is generally annular, and its outer diameter matches the inner diameter of the first inner circumferential wall 929 described above, and its height can also match the height of the first inner circumferential wall 929, so that after assembly, the lower end face 914 of the fixed gear body 91 abuts against the bracket step 923, and the upper end face 913 of the fixed gear body can be roughly flush with the upper end face 926 of the fixed gear bracket 92. In order to achieve the relative positioning of the fixed gear body 91 and the fixed gear bracket 92 in the circumferential direction, a slot portion 912 can be provided on the outer edge of the fixed gear body, and a corresponding stop portion 927 can be provided on the first inner circumferential wall 929, that is, the slot portion 912 is recessed inwardly relative to the outer edge of the fixed gear body, and the stop portion 927 is protruding outwardly relative to the first inner circumferential wall 929, so that after assembly, the slot portion 912 can be engaged with the stop portion 927, thereby achieving the relative positioning of the fixed gear body and the fixed gear bracket in the circumferential direction. In this embodiment, the number of the slots 912 and the stoppers 927 are both two and symmetrically distributed, so that during assembly, the fixed gear body 91 can be assembled smoothly with the fixed gear bracket regardless of the front and back sides. The inner edge of the fixed gear body is a fixed tooth 911, which is used to mesh with the planetary gear set. Of course, the above-mentioned slots 912 and stoppers 927 are only disclosed as a specific implementation method, and various equivalent changes can be made to the matching structure of the slots and the stoppers. For example, a concave slot is set on the first inner peripheral wall, and a convex stopper is set on the outer edge of the fixed gear body, which can also achieve the purpose of circumferential limitation.

[0084] The fixed gear bracket 91 can be formed by powder metallurgy sintering, and the fixed gear body can be formed by plastic integral injection molding, such as injection molding of polymer materials.

[0085] The assembly process of the electric valve of this embodiment is described below. The valve seat assembly can be assembled and fixed as one assembly first, that is, the first plate body 111, the second plate body 112, the third plate body 113, the first connecting pipe 114, the second connecting pipe 115, and the columnar portion 116 are assembled in sequence and then fixed by welding. The valve shaft 14 can be fixedly connected to the valve seat assembly by welding or by press fitting.

[0086] Then, the fixed gear bracket 91 is assembled to the valve seat assembly so that the bracket positioning portion 922 matches the positioning groove portion 1121 of the second plate body, and the two can be clearance matched. Then, the valve shaft 14 and the bracket step portion 923 are positioned using a tool to ensure that the fixed gear bracket 91 has good concentricity relative to the valve shaft 14, and the fixed gear bracket 91 is pressed on the second plate body so that the bracket lower end surface 925 abuts against the upper surface of the second plate body, and laser welding is performed to fix the fixed gear bracket to the second plate body.

[0087] Then, the gear slider is installed, that is, the through hole portion 204 of the gear slider is installed along the valve shaft 14, so that the contact surface 2051 of the gear slider is in contact with the matching surface 1134 of the third plate body. Then, the planetary gear set 18 is partially installed into the gear slider 20, and the small diameter gear 1832 of the planetary gear set 18 is meshed with the slider gear portion 203, and the large diameter gear 1831 is located above the gear slider 20.

[0088] Then, glue is applied to the step portion 923 of the bracket, and the fixed gear body 92 is installed into the fixed gear bracket 91, and the slot portion 912 and the stop portion 927 are aligned and assembled in place, and then pressed to fix the fixed gear body 92 to the fixed gear bracket 91, and the fixed tooth 911 is meshed with the outer side of the large diameter tooth 1831 of the planetary gear set. Then, the rotor 12 with the sun gear 13, the spring 17, and the shaft sleeve 60 are installed; then the sleeve component is installed, and the sleeve component is welded and fixed to the valve seat assembly. Of course, in this step, in addition to the glue bonding method, the fixed gear body and the fixed gear bracket can also be fixed by crimping. For example, the top of the fixed gear bracket continues to extend upward on the upper end surface. After the fixed gear body is installed, the extended part is crimped to deform it, so that the fixed gear body is limited in the fixed gear bracket.

[0089] It should be noted that the above assembly sequence can also be adjusted accordingly, for example, the gear slider and the planetary gear can be assembled first, and then the fixed gear bracket 91 and the valve seat assembly 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.

[0090] 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 components are also introduced for the convenience of description, and do not mean any limitation on any order of the components. In addition, in each embodiment 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.

[0091] 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 valve body includes a valve seat assembly, a valve shaft, a sleeve component, a rotor, a sun gear, a planetary gear set, a fixed gear, and a gear slider; The valve seat assembly comprises a first plate body, a second plate body, a third plate body, a first connecting pipe and a second connecting pipe, wherein the first plate body is fixedly connected to the second plate body, and the third plate body is fixedly connected to the second plate body; The sleeve component is welded and fixed to the valve seat assembly; The rotor is fixedly connected or position-limitedly connected to the sun gear, the valve shaft is passed through the sun gear, the planetary gear set, and the gear slider, and is fixedly connected or position-limitedly connected to the valve seat assembly; The fixed gear comprises a fixed gear body and a fixed gear bracket, and the fixed gear bracket is fixedly connected to the valve seat assembly; The gear slider includes a slider gear part and a flow control part, and the flow control part is in contact with the valve seat assembly and can rotate relative to the valve seat assembly; The planetary gear set includes planetary gears, and the planetary gears include large-diameter gears and small-diameter gears. The large-diameter gears are meshed with the fixed gear and the sun gear, and the small-diameter gears are meshed with the slider gear portion.

2. The electric valve according to claim 1, characterized in that: The sleeve component is integrally stamped, or the sleeve component includes a first sleeve component and a second sleeve component, the first sleeve component and the second sleeve component are welded and fixed, and the sleeve component includes a first top wall portion, a second top wall portion, a first side wall portion, and a second side wall portion.

3. The electric valve according to claim 1, characterized in that: The fixed gear bracket includes a bracket positioning portion, the valve seat assembly includes a positioning groove portion, the bracket positioning portion cooperates with the positioning groove portion to achieve circumferential limiting, and the fixed gear bracket is welded and fixed to the valve seat assembly.

4. The electric valve according to claim 3, characterized in that: The third plate body is provided with a mating surface, and the third plate body includes a flow regulating part and a valve mouth part. The valve mouth part passes through the third plate body. The flow regulating part is located on one side of the mating surface and is recessed inward relative to the mating surface. The gear slider can be attached to the mating surface and rotate relative to the third plate body to change the flow cross-sectional area of ​​the flow regulating part.

5. The electric valve according to claim 4, characterized in that: The edge line of the flow regulating part includes a first curve and a second curve, the valve mouth part has a valve mouth contour line, the first curve and the second curve both intersect with the valve mouth contour line, and the spacing between the first curve and the second curve gradually increases along the direction approaching the valve mouth part, the first curve adopts an Archimedean spiral or an arc line, the second curve adopts an Archimedean spiral, and the diameter φ of the valve mouth part takes a value range of 1.2mm<φ<2mm.

6. The electric valve according to claim 1, characterized in that: The second plate body portion includes a solder accommodating portion, which forms a through hole that penetrates the second plate body portion, and the first plate body portion and the second plate body portion are fixedly connected by welding; at least one of the first plate body portion and the second plate body portion is provided with a groove-like portion, which is annular, and a projection area of ​​the groove-like portion in the axial direction is smaller than a projection area of ​​the second plate body portion in the axial direction.

7. The electric valve according to claim 1, characterized in that: The gear slider includes a main body and a positioning portion protruding from the outer edge of the main body, the positioning portion includes a first positioning portion and a second positioning portion; the gear slider is coaxially arranged with the fixed gear, the fixed gear includes a protruding portion, the distance between the protruding portion and the valve shaft matches the distance between the positioning portion and the valve shaft, and the gear slider abuts against the protruding portion through the first positioning portion and the second positioning portion respectively during rotation.

8. A method for manufacturing an electric valve as claimed in claim 4, characterized in that: The following steps are involved: 1) Prepare the valve seat assembly, assemble and position the first plate body, the second plate body, the third plate body, the first connecting pipe, the second connecting pipe, and the columnar portion in sequence, fix them by welding, and weld the valve shaft to the valve seat assembly; 2) Assemble the fixed gear bracket to the valve seat assembly so that the bracket positioning portion matches the positioning groove portion of the second plate body, use a tool to position the valve shaft and the bracket step portion, and perform laser welding to fix the fixed gear bracket to the second plate body; 3) Install the gear slider along the valve shaft so that the fitting surface of the gear slider fits with the matching surface of the third plate body; install the planetary gear set along the valve shaft so that the small-diameter gear of the planetary gear set meshes with the slider gear part; 4) Installing the fixed gear body into the fixed gear bracket and fixing the fixed gear body, and making the fixed gear body mesh with the large diameter gear of the planetary gear set; 5) Install the rotor, spring and sleeve with sun gear; 6) Install the sleeve component and weld the sleeve component and the valve seat assembly to fix them.

9. A method for manufacturing an electric valve as claimed in claim 4, characterized in that: The following steps are involved: 1) Prepare the valve seat assembly, assemble and position the first plate body, the second plate body, the third plate body, the first connecting pipe, the second connecting pipe, and the columnar portion in sequence, fix them by welding, and weld the valve shaft to the valve seat assembly; 2) Install the gear slider along the valve shaft so that the fitting surface of the gear slider fits with the matching surface of the third plate body; install the planetary gear set along the valve shaft so that the small-diameter gear of the planetary gear set meshes with the slider gear part; 3) Assemble the fixed gear bracket to the valve seat assembly so that the bracket positioning portion matches the positioning groove portion of the second plate body, use a tool to position the valve shaft and the bracket step portion, and perform laser welding to fix the fixed gear bracket to the second plate body; 4) Installing the fixed gear body into the fixed gear bracket and fixing the fixed gear body, and making the fixed gear body mesh with the large diameter gear of the planetary gear set; 5) Install the rotor, spring and sleeve with sun gear; 6) Install the sleeve component and weld the sleeve component and the valve seat assembly to fix them.

10. The method for assembling an electric valve according to claim 8 or 9, characterized in that: In the step 1), solder is placed in the solder receiving portion of the second plate body, and the solder is melted by furnace welding to weld and fix the first plate body, the second plate body, and the third plate body.

11. The method for assembling an electric valve according to claim 8 or 9, characterized in that: In the step 4), glue is applied to the step portion of the fixed gear bracket, and the fixed gear body is installed into the fixed gear bracket so that the fixed gear body and the fixed gear bracket are adhered and fixed.

12. The method for assembling an electric valve according to claim 8 or 9, characterized in that: In the step 4), the fixed gear body has an extension portion relative to the upper end surface. After the fixed gear body is installed into the fixed gear bracket, the extension portion is crimped to limit the fixed gear body in the fixed gear bracket.

Images