Electric valve

Abstract

An electric valve includes a valve body, the valve body includes a valve seat assembly and a gear slider, the valve seat assembly includes a first plate body portion, a second plate body portion, a third plate body portion, a first connecting pipe and a second connecting pipe, the third plate body portion includes a flow regulating portion and a valve mouth portion, the valve mouth portion passes through the third plate body portion, the flow regulating portion is located on one side of the mating surface and is recessed inward relative to the mating surface; the edge line of the flow regulating portion includes a first curve and a second curve, the valve mouth portion 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 portion, the first curve adopts an Archimedean spiral or a circular arc line, the second curve adopts an Archimedean spiral, and the diameter φ of the valve mouth portion is in the range of 1.2mm<φ<2mm.

Description

Technical field

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

[0002] Refrigerators and other refrigeration equipment are widely used in various applications. For example, each temperature zone in a refrigerator operates within a preset temperature range, known as intermittent cooling. When the preset temperature is reached, the compressor shuts down. When the actual temperature in a zone exceeds the preset temperature, the compressor restarts to cool the zone to the preset temperature. Each time the compressor shuts down and restarts, significant startup power consumption is generated. Furthermore, during the initial startup, high-temperature refrigerant enters the evaporator and heats up. Cooling only begins when the refrigeration cycle conditions are met. Throttling is achieved using capillary tubes. [Summary of the invention]

[0003] One embodiment of the present invention aims to provide an electric valve suitable for precise regulation of refrigerant flow in situations where the refrigerant flow is relatively small. To this end, this embodiment adopts the following technical solutions:

[0004] An electric valve, characterized in that it includes a valve body, the valve body includes a valve seat assembly, 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 first plate body is fixedly connected to the second plate body, the third plate body is fixedly connected to the second plate body; the third plate body is provided with a mating surface, the third plate body includes a flow regulating portion and a valve port portion, the valve port portion passes through the third plate body, the flow regulating portion is located on one side of the mating surface and is recessed inwardly relative to the mating surface; the gear slider can It can fit with the mating surface and rotate relative to the third plate body to change the flow cross-sectional area of the flow regulating part; 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 a circular arc line, the second curve adopts an Archimedean spiral, and the diameter φ of the valve mouth part is in the range of 1.2mm<φ<2mm.

[0005] The electric valve provided in the present application can achieve relatively precise regulation of the refrigerant flow rate while the overall size of the electric valve is relatively small by providing a flow adjustment part on the valve seat component and a flow control part on the gear slider.

Brief Description of the Drawings

[0006] Figure 1 A cross-sectional schematic diagram of an embodiment of the present invention;

[0007] Figure 2 A schematic cross-sectional view of a valve seat assembly structure provided in one embodiment of the present invention;

[0008] Figure 3 An exploded view of a valve seat assembly provided in accordance with one embodiment of the present invention;

[0009] Figure 4 A top view of a valve seat assembly provided in accordance with one embodiment of the present invention;

[0010] Figure 5 A schematic diagram of the fixed gear structure provided in the first embodiment of the present invention;

[0011] Figure 6 This is a schematic diagram of the front view of the gear slider provided by the first embodiment of the present invention;

[0012] Figure 7 This is a schematic diagram of the appearance of the gear slider provided by the first embodiment of the present invention from a reverse perspective;

[0013] Figure 8 A schematic structural diagram of a planetary gear set provided in a first embodiment of the present invention;

[0014] Figure 9 This is a schematic diagram of the positional relationship between the gear slider and the valve seat assembly when the electric valve is in the fully closed state;

[0015] Figure 10 This is a schematic diagram of the positional relationship between the gear slider and the valve seat assembly when the electric valve is in the intermediate state of flow regulation;

[0016] Figure 11 This is a schematic diagram of the positional relationship between the gear slider and the valve seat assembly when the electric valve is in the fully open flow state;

[0017] Figure 12 This is a schematic structural diagram of the third plate portion 113 according to the first embodiment of the present invention;

[0018] Figure 13 1 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention;

[0019] Figure 14 for Figure 13 A three-dimensional schematic diagram of the first plate portion;

[0020] Figure 15 1 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention;

[0021] Figure 16 for Figure 15 A three-dimensional schematic diagram of the second plate portion;

[0022] Figure 17 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention;

[0023] Figure 18 This is a structural diagram of another embodiment of the present invention;

[0024] Figure 19 yes Figure 18 Schematic diagram of the structure of the fixed gear bracket;

[0025] Figure 20 yes Figure 18 Schematic diagram of the matching process between the fixed gear and the valve seat assembly;

[0026] Figure 21 yes Figure 18 Schematic cross-section of the fixed gear and valve seat assembly after assembly. [Specific implementation method]

[0027] 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 with reference to the accompanying drawings and specific embodiments.

[0028] Please refer to Figure 1 , Figure 1 Schematic cross-section 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). The valve body 1 includes a valve seat assembly 11, a rotor 12, and a valve shaft 14. The stator coil of the electric valve is connected to a drive controller. When the drive controller is energized, it sends a pulse drive signal to the stator coil, generating a periodically changing magnetic field, thereby driving the rotor 12 of the electric valve to rotate in the forward or reverse direction.

[0029] The rotor 12 is fixedly connected to the sun gear 13. Thus, 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, a limited connection can also be set 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 its center. The valve shaft 14 is inserted into 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.

[0030] 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 larger 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 fixed to 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 the second top wall portion 1521, but is an equal-diameter sleeve with both 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, which can also achieve the above-mentioned connection relationship. 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 in one step to simultaneously form the first side wall portion 1512, the second side wall portion 1522, the first top wall portion 1511, and the second top wall portion 1521. This can also achieve the purpose of the present invention. The method of connecting the first sleeve component and the second sleeve component in this embodiment is only a specific implementation method and cannot be understood as limiting the scope of protection.

[0031] A protrusion 1511a is provided at the center of the top wall 1511 of the first sleeve component. The protrusion 1511a protrudes outward, thereby forming a recessed portion 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 1As shown, the upper end of sleeve 16 is located within the recess formed by raised portion 1511a, ensuring that the axis of the valve shaft and the central axis of the valve body are approximately aligned. A spring 17 is disposed between sleeve 16 and sun gear 13, with one end of spring 17 abutting sleeve 16 and the other end of spring 17 abutting sun gear 13. Spring 17 provides a certain preload force on sun gear 13, restraining sun gear 13 from excessive upward displacement. It should be noted that in this embodiment, when the sun gear 13 is connected to the rotor 12, the lower end of the spring abuts the sun gear. However, since the sun gear and rotor can be considered a single component, there are multiple structural combinations. Therefore, the lower end of the spring can also abut the rotor.

[0032] A planetary gear assembly 18, a fixed gear 19, and a valve block gear 20 are located within the valve chamber, roughly enclosed by the first and second sleeve components, and the valve seat assembly. The main operating principle is that the rotation of the rotor and sun gear drives the planetary gears of the planetary gear assembly, which in turn rotates the valve block gears, changing the position of the valve block gears relative to the valve seat assembly to achieve flow control. The following describes the structure and connection or mating relationship between the valve seat assembly, planetary gear assembly, fixed gear, and valve block gear.

[0033] 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 : This 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 serve as the inflow or outflow channel of the fluid medium of the electric valve, respectively, and are generally used for installation in refrigerators, freezers, air conditioners, and other cooling and heating systems to connect to the system pipeline. 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 fixedly connected to the upper and lower surfaces of the second plate body 112, respectively.

[0034] The first plate body 111 is generally a plate-shaped structure, having a first hole portion 1111 arranged in the center. In this embodiment, the first hole portion 1111 is a blind hole structure, that is, it does not pass through the first plate body 111. After assembly, the valve shaft 14 is inserted into the first hole portion 1111 and fixed. A first pipe mounting portion 1112 and a second pipe mounting portion 1113 are provided on both sides of the central portion. Both the first pipe mounting portion 1112 and the second pipe mounting portion 1113 are through-holes extending through the upper and lower surfaces of the first plate portion 111. The first pipe 114 is fixedly connected to the first plate portion 111 via the first pipe mounting portion 1112, and the second pipe 115 is fixedly connected to the first plate portion 111 via the second pipe mounting portion 1113. Since the second plate portion 112 is provided above the first plate portion 111 and the two are tightly fitted together, the second plate portion can serve as a positioning mechanism when installing the first and second pipes. That is, after the first pipe 114 is inserted into the first pipe mounting portion 1112, it abuts against the second plate portion 112, thereby ensuring the insertion depth. A first step portion 1114 is provided on the outer edge of the first plate portion. During assembly, the second side wall portion 1522 of the second sleeve component can abut and cooperate with the first step portion 1114 for positioning, and can be fixedly connected by welding.

[0035] The second plate portion 112 is generally plate-shaped and has a centrally located second hole 1124. This second hole 1124 is a through-hole extending through the second plate portion 112. After assembly, the second hole 1124 and the first hole 1111 are generally coaxial. The valve shaft is inserted through the second hole 1124 and then into the first hole 1111 for securement. A first guide groove 1122 and a second guide groove 1123 are also located on either side of the central portion of the second plate portion 112. In this embodiment, the first guide groove 1122 directs the throttled fluid toward the outlet, while the second guide groove 1123 directs the fluid flowing into the electric valve. Specifically, after the fluid flows from the second connecting pipe 115, it enters the valve cavity through the cavity formed by the second guide groove 1123. After throttling (the specific throttling process will be described below), the fluid enters the first connecting pipe 114 through the cavity formed by the first guide groove 1122 and exits the electric valve. The first guide groove portion 1122 and the first connecting pipe mounting portion 1112 of the first plate-shaped portion 111 have an intersecting portion in axial projection, so that the fluid can flow from the cavity formed by the first guide groove portion 1122 to the first connecting pipe 114. At the same time, the second guide groove portion 1123 and the second connecting pipe mounting portion 1113 of the first plate-shaped portion 111 have an intersecting portion in axial projection, so that the fluid can flow from the second connecting pipe into the cavity formed by the second guide groove portion 1123. The first guide groove portion 1122 is a hole-like structure and passes through the second plate portion 112. When the first plate portion 111, the second plate portion 112, and the third plate portion 113 are assembled, the fluid in the cavity formed by the first guide groove portion 1122 cannot flow out of the second plate portion along the radial direction of the second plate 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 (that is, the extension direction of the second guide groove portion 1123).

[0036] The outer diameter of the second plate portion 112 is smaller than that of the first plate portion 111, thus forming a second step 1118 at the edges of the two. The fixed gear 19, described below, is mounted on the valve seat assembly 11 via the second step 1118. Furthermore, a positioning groove 1121 is provided on the outer edge of the second plate portion 112. Accordingly, a protrusion 1921 is provided on the inner circumferential wall of the fixed gear 19. The protrusion 1921 cooperates with the positioning groove 1121 to achieve circumferential positioning of the fixed gear 19 and the second plate portion 112, that is, to prevent the fixed gear 19 from rotating relative to the second plate portion 112.

[0037] The third plate portion 113 is generally in a plate-like structure. Figure 3The figure is a reference. The top of the third plate portion 113 is a mating surface 1134. The bottom surface of the valve block gear described below can rotate in close contact with the mating surface 1134. The third plate portion 113 has a third hole 1133 located at its center. The third hole 1133 is a through hole that passes through the third plate portion 113. After assembly, the third hole 1133 is generally 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 before being secured. The third plate portion 113 is provided with a flow regulating portion 1131 and a valve port portion 1132. The flow regulating portion 1131 is provided on a mating surface 1134 of the third plate portion 113 and is recessed inwardly, forming a groove-like structure that does not penetrate the third plate portion. One end of the groove is connected to the valve port portion 1132. The valve port portion 1132 forms a flow hole that penetrates the third plate portion. Fluid can flow along the flow regulating portion 1131 and out of the flow hole of the valve port portion 1132. The specific structure of the flow regulating portion 1131 will be described below.

[0038] 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.

[0039] 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 that passes through the second plate body 112. Figure 3 In this embodiment, the number of solder receiving portions 1123 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 other methods. At this time, the solder can diffuse 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.

[0040] Of course, the solder accommodating portion 1125 is not limited to the form of a through hole passing through the second plate body portion 112. For example, the solder accommodating portion 1125 can be in the form of a notch formed around the second plate body portion 112. In this case, the solder between the first plate body portion 111 and the second plate body portion 112 can also be made more uniform and the area between the first plate body portion 111 and the second plate body portion 112 where the solder is not filled is smaller.

[0041] The valve seat assembly 11 provided in this embodiment can process the first plate body portion 111 and the second plate body portion 112 separately and then fixedly connect them, which can relatively reduce the processing difficulty and processing cost of the valve seat assembly 11.

[0042] The third plate portion 113 and the second plate portion 112 may be fixedly connected in a variety of ways. For example, the third plate portion 113 and the second plate portion 112 may be welded together, or the third plate portion 113 and the second plate portion 112 may be glued together.

[0043] 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 fixed relative positions 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 form of through-holes, and the third positioning portion 1135 is in the form of a notch. The columnar portion 116 passes through 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 portion 111. More specifically, the columnar portion 116 can be fixedly connected to the first plate portion 111, the second plate portion 112, and the third plate portion 113 by welding. While the columnar portion 116 serves as a positioning component, the portion extending out of the first plate portion 111 can also serve as a fixing component for the electromagnetic coil.

[0044] 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.

[0045] Please refer to Figure 5 , Figure 5Schematic diagram of the fixed gear structure provided by the first embodiment of the present invention. The fixed gear 19 is generally cylindrical and has a large diameter portion 191 and a small diameter portion 192. The large diameter portion 191 is axially lower than the small diameter portion 192. Thus, a step 193 is formed between the large diameter portion 191 and the small diameter portion 192. The step 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. After assembly, the fixed gear top wall portion 1911 is abutted by the second top wall portion 1521 of the sleeve component to limit the fixed gear in the axial direction. The fixed gear portion 1912 is used to mesh with the planetary gear 18 described below.

[0046] The inner circumferential wall of the small-diameter portion 192 is further provided with a protrusion 1921. The protrusion 1921 is strip-shaped and extends along the axial direction of the fixed gear, extending all the way to 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 can be 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 portion 112. As mentioned above, the outer edge of the second plate portion 112 is provided with a positioning groove 1121. In this way, during assembly, the bottom wall 193 of the fixed gear 19 abuts the first plate portion 111, and the protrusion 1921 is locked 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 portion 112.

[0047] To further ensure that the fixed gear 19 is less affected by the abutment between the sleeve assembly and the fixed gear 19, a pressing portion 194 is provided on the outer edge of the top wall 1911. The pressing portion 194 is higher than the top wall 1911 and has a generally annular structure. Thus, when the fixed gear 19 abuts the sleeve assembly, the second top wall 1521 abuts against the pressing portion 194, thereby limiting the axial position of the fixed gear 19. To prevent the sleeve assembly from deforming the fixed gear when abutting against the pressing portion 194, thereby affecting the meshing accuracy of the fixed gear 1912, a groove 195 is provided on one side of the pressing portion 194 near the central axis. In this embodiment, the cross-section of the groove 195 is triangular. Thus, even if the sleeve assembly applies a relatively large force to the pressing portion 194 during assembly, the fixed gear 1912 will not be seriously affected. Of course, the cross-sectional shape of the groove portion 195 is not limited to a triangle. Those skilled in the art will 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 this embodiment.

[0048] The fixed gear 19 can be integrally injection molded from a plastic, such as a polymer. The fixed gear positioning structure provided in this embodiment has one end abutting against the second plate portion 112, while the pressing portion 194 at the other end abuts against the second top wall portion 1521 of the sleeve component, thereby achieving circumferential and axial positioning of the fixed gear within the electric valve, making assembly relatively simple. Furthermore, the raised portion 1921 provided on the fixed gear not only achieves circumferential positioning with the positioning groove 1121 of the second plate portion 112 but also controls the rotational range of the gear slider 20.

[0049] 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 The figure is a schematic diagram of the appearance of the gear slider provided by the first embodiment of the present invention from a reverse perspective. The gear slider 20 is generally cylindrical with a bottom, and includes a main body 201 and a positioning portion 202 protruding from the outer edge of the main body 201. The positioning portion 202 has a generally sector-shaped cross-section and is coaxial 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 provided 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 shown in the figure, the first positioning portion 2021 abuts against one side of the protrusion 1921, preventing the gear slider from rotating further; when the gear slider 20 rotates to the extreme position in the counterclockwise direction shown in the figure, the second positioning portion 2022 abuts against the other side of the protrusion 1921, preventing the gear slider from rotating further. In this way, the rotation stroke of the gear slider is determined by the cooperation between 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.

[0050] The inner peripheral wall of the gear slider 20 is provided with a slider gear portion 203, and the slider gear 203 can be engaged with the planetary gear assembly described below. and The gear slider 20 is driven by the planetary gears to rotate. The bottom of the gear slider 20 is provided with a flow control part 205, and the flow control part 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.

[0051] Please refer to Figure 8 , Figure 8 : is a schematic diagram of the structure of the planetary gear set provided by the first embodiment. The planetary gear set 18 includes a planetary carrier 181 and a cover plate 182. The planetary 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 a structure with 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. To this end, in this embodiment, the number of support columns 1811 is also three, and they are evenly distributed along the circumferential direction. The three planetary gears 183 are arranged between two adjacent support columns 1811. The planetary carrier 181 and the cover plate 182 are fixedly connected to axially limit the planetary gears 183. Specifically, a small hole can be provided 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 to achieve a fixed connection. The planetary carrier 181 can be injection molded from plastic, and the cover plate 182 can be stamped from sheet metal. This allows for convenient heating and deformation of the end portion 18111 to prevent the cover plate from separating from the planetary carrier. The three planetary gears 183 are secured to the planetary carrier via planetary gear shafts 184, each capable of rotating about the planetary gear shafts 184. One end of the planetary gear shaft 184 is fixedly connected to or in contact with the planetary carrier bottom 1812, while the other end is fixedly connected to or in contact with the cover plate 182.

[0052] Taking one of the planetary gears 183 as an example, planetary gear 183 comprises two gear stages: a large-diameter gear 1831 at the upper end and a small-diameter gear 1832 at the 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 gears 183 to rotate. The three planetary gears 183 form a virtual circle, with the inner side of the large-diameter gear 1831 meshing with the sun gear 13 and the outer side of the large-diameter gear 1831 meshing with the fixed gear portion 1912 of the fixed gear 19. Thus, when the sun gear 13 rotates, it drives the planetary gears 183 to rotate. The planetary gears 183 rotate around the planetary gear shaft 184 while also rotating along the fixed gear portion 1912 of the fixed gear. Small-diameter gear 1832 meshes with the slider gear portion 203 of gear slider 20, thereby driving the gear slider 20 to rotate. The gear slider's rotation is stopped by the abutment of the first and second positioning portions 2021, 2022, respectively, with the fixed gear's raised portion 1921. In this way, the electric valve, powered by the electromagnetic coil, drives the rotor and sun gear 13 to rotate. This is reduced by the planetary gear train, ultimately driving the gear slider 20 to rotate. The flow control portion 205 at the bottom of the gear slider mates with the mating surface 1134 of the third plate portion 113, allowing the notch 2052 of the flow control portion to align with different portions of the flow regulating portion 1131 of the third plate portion, thereby achieving flow regulation.

[0053] The following combination Figure 9-11 To illustrate the process of flow regulation. Figure 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. Figure 10 This is a schematic diagram of the positional relationship between the gear slider and the valve seat assembly when the electric valve is in the intermediate state of flow regulation. Figure 11 This is a schematic diagram of the positional relationship between the gear slider and the valve seat assembly when the electric valve is in the fully open flow state.

[0054] There is at least one relative position between the gear slider 20 and the third plate body, and there is no overlapping area between the axial projection of the notch 2052 and the axial projection of the valve mouth 1132, and between the axial projection of the notch 2052 and the axial projection of the flow regulating portion 1131. Specifically, Figure 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. Figure 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 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.

[0055] There is at least one relative position between the gear slider 20 and the third plate portion 113, where the axial projection of the notch portion 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 rate of the electric valve. Figure 10 As shown, after the gear slider 20 rotates counterclockwise by a certain angle, the axial projection of the flow control portion 2051 partially overlaps with the flow regulating portion 1131, namely, area A shown in the figure. Area A is a part of the flow regulating portion 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 portion 1131 through area A of the flow regulating portion 1131, and then flow out from the valve port 1132. At this time, the cross-sectional area of area A (the shaded area in the figure) determines the throttling flow of the electric valve. Those skilled in the art will understand that Figure 10 A specific position of the gear slider is shown. 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.

[0056] The gear slider 20 and the third plate portion 113 have at least one relative position, and at least part of the axial projection of the notch portion 2052 overlaps with the axial projection of the valve opening portion 1132. The valve opening formed by the valve opening portion 1132 communicates with the internal space of the first connecting pipe 114. The inner diameter of the valve opening portion 1132 determines the flow rate of the electric valve. Figure 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 entirely located 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. Figure 11 As shown in area A in the middle, the electric valve is in the fully open state at this time.

[0057] The following combination Figure 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. Figure 12This is a schematic diagram of the structure of the third plate portion 113. The third plate portion 113 is generally flat, with a third positioning portion 1135 provided on its circumferential edge for cooperating with the columnar portion 116 to achieve longitudinal positioning between the first, second, and third plate portions. A third hole portion 1133 is provided in the center of the third plate portion 113 for assembly with the valve shaft 14. The valve mouth portion 1132 forms a flow hole that passes through the third plate portion, and a valve mouth contour line 1132a is formed on the mating surface 1134. The diameter φ of the valve mouth portion 1132 is in the range of 1.2mm<φ<2mm. On one side of the valve mouth portion 1132, an inwardly recessed flow regulating portion 1131 is formed on the mating surface 1134. The flow regulating portion 1131 is generally in the shape of a narrow, long arcuate groove, with the edge line of the flow regulating portion 1131 defined by a first curve 1131a and a second curve 1131b. The first curve 1131a can adopt an Archimedean spiral or a circular arc, and 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 adopt an Archimedean spiral, and one end of the second curve 1131b intersects with the valve mouth contour line 1132a at point C. In this way, the distance between the first curve 1131a and the second curve 1131b gradually increases in the direction close to the valve mouth portion 1132. At one end close to the valve mouth portion 1132, the distance 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 distance L2 between the first curve 1131a and the second curve 1131b satisfies: 0.05mm<L2<0.15mm, and this end can adopt a rounded transition, such as Figure 12 As shown, at the left end of the figure, first curve 1131a and second curve 1131b are connected by a third curve 1131c. Third curve 1131c can be an arc, and its radius R satisfies the following: 0.1mm<R<0.3mm. Thus, flow control portion 1131 is smaller overall than conventional needle valve flow control valves, making it particularly suitable for precise regulation of small flow rates, such as refrigerant flow regulation in refrigerator refrigeration systems.

[0058] 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 the end close to the valve mouth portion 1132, the depth H1 of the flow regulating portion 1131 satisfies: 0.3mm

[0059] ​In actual operation, the width and depth of the flow regulating portion 1131 can be set accordingly according to the system flow requirements to meet different needs.

[0060] The following describes the assembly process of the electric valve. The valve seat assembly can be assembled and fixed into a single component. That is, the first plate portion 111, the second plate portion 112, the third plate portion 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 fixed to the valve seat assembly by welding or press-fitting. Next, 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 mating surface 2051 of the gear slider is mating with the mating surface 1134 of the third plate portion. The planetary gear set 18 is then partially installed into the gear slider 20, with the small-diameter gear 1832 of the planetary gear set 18 meshing with the slider gear portion 203, while the large-diameter gear 1831 is located above the gear slider 20. The fixed gear 19 is then installed from above, with the raised portion 1921 of the fixed gear engaging the positioning groove 1121 of the second plate portion, thereby positioning the fixed gear circumferentially and engaging the fixed gear portion 1912 with the outer side of the large-diameter teeth 1831 of the planetary gear set. The rotor 12 with the sun gear 13, the spring 17, and the bushing 16 are then installed. The sleeve component is then installed. It should be noted that the sleeve component here can be a sleeve component that is assembled by welding the first and second sleeve components separately as described in the first embodiment, or it can be stamped integrally. The sleeve component comprises a first side wall portion 1512, a second side wall portion 1522, a first top wall portion 1511, and a second top wall portion 1521. After assembly, the second top wall portion 1521 is press-fitted with the upper edge of the fixed gear 19 to achieve axial positioning of the fixed gear, and the sleeve component is welded to the valve seat assembly.

[0061] The following combination Figure 13 , Figure 14 Another embodiment of the valve seat assembly is described, which is conducive to welding the valve seat assembly and the sleeve component. Figure 13 FIG. 1 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention. Figure 14 yes Figure 13 A three-dimensional schematic diagram of the first plate portion.

[0062] 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 provided through the second plate body. The first plate body 111 and the second plate body 112 are first fixed by a fixture, and then solder is placed in the solder receiving cavity. The solder is then melted by furnace welding. At this time, the solder will diffuse outward from the solder receiving cavity along the contact surface between the first plate body 111 and the second plate body 112 to achieve the purpose of welding and fixing. However, the contact area between the first plate body 111 and the second plate body 112 is relatively large, and a relatively large amount of solder is required to achieve stable welding quality. However, if too much solder is placed, during furnace welding, excess solder may overflow the contact surface between the first plate body 111 and the second plate body 112 and may flow into the mating portion between the first plate body 111 and the sleeve component. The sleeve and the first plate can be made of the same stainless steel material and laser welded together to achieve sealing and securement. If solder is located between the sleeve and the first plate, cracks may form at the solder during laser welding, resulting in poor sealing of the electric valve and a potential risk of leakage.

[0063] In order to solve this problem, the structure of the first plate portion 111 can be improved, such as Figure 14 As shown, in this embodiment, an annular groove 1116 is provided along one side of the first plate portion 111 facing the second plate portion, and the groove 1116 is at least partially covered by the second plate portion 112. Specifically, except for the portion corresponding to the second guide groove 1123 of the second plate portion 112, the remaining portion is covered by the second plate portion 112. In other words, a roughly annular space for solder to flow into is formed between the annular groove 1116 and the second plate portion 112. Thus, during the furnace soldering process, after the solder melts, it diffuses outward from the solder receiving cavity and flows along the contact area between the first and second plate portions 111, 112, and into the roughly annular space formed by the groove 1116, preventing the solder from continuing to overflow along the gap between the first and second plate portions 111, 112 and into the portion of the first plate portion 111 intended for assembly with the sleeve component. This structure can effectively reduce the welding defect rate between the sleeve component and the valve seat assembly and improve the welding quality of the product. The cross-sectional shape of the groove portion 1116 can be as follows: Figure 14 The triangle shown can of course be any other shape suitable for processing. This embodiment does not limit the specific structure, shape, and size of the groove portion 1116.

[0064] Please refer to Figure 15 、 Figure 16 ,in, Figure 15 FIG. 1 is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention. Figure 16 yes Figure 15 A three-dimensional schematic diagram of the second plate portion.

[0065] 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 the 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 remaining portions are all abutted against the first plate body 111. That is, a roughly annular space for solder to flow into 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 holding cavity and 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 of the sleeve component and the valve seat assembly, and improve the product welding quality. The cross-sectional shape of the groove portion 1127 can be as follows: Figure 16 The triangle shown can of course be any other shape suitable for processing. This embodiment does not limit the specific structure, shape, and size of the groove portion 1127.

[0066] Please refer to Figure 17 , Figure 17 It is a cross-sectional schematic diagram of another embodiment of the valve seat assembly of the present invention.

[0067] As another alternative embodiment, in this embodiment, an annular third step 1117 is provided along the side of the first plate portion 111 facing the second plate portion, and the outer diameter of at least a portion of the third step 1117 is smaller than the outer diameter of the second plate portion 112. That is, when projected axially, at least a portion of the third step 1117 lies within the projection of the second plate portion 112. Specifically, the third step 1117 forms an annular space along the circumferential direction between the first plate portion 111 and the second plate portion 112, into which solder flows. Thus, during the furnace soldering process, after melting, the solder diffuses outward from the solder receiving cavity, flows along the contact area between the first plate portion 111 and the second plate portion 112, and partially flows into the aforementioned annular space. Because the flow and penetration of solder is typically caused by capillary action, the annular space formed by the third step 1117 and the second plate portion 112 is much larger than the air gap caused by the capillary action. Therefore, after entering this annular space, the solder will not continue to flow along the first plate portion 111 to the area of the first plate portion 111 that is used for assembly with the sleeve component. This structure can also relatively reduce the welding failure rate of the sleeve component and the valve seat assembly, improving the product welding quality.

[0068] The following combination Figure 18-21 Another embodiment of the fixed gear and valve seat assembly is described. Figure 18-21 ,in, Figure 18 1 is a structural diagram of another embodiment of the present invention. Figure 19 yes Figure 18 Schematic diagram of the structure of the fixed gear bracket, Figure 20 This is a schematic diagram of the matching process between the fixed gear and the valve seat assembly. Figure 21 It is a cross-sectional diagram after the fixed gear and valve seat assembly are assembled.

[0069] The main differences between this embodiment and the first embodiment lie in the coupling between the shaft sleeve 160, the fixed gear 9, the fixed gear and the valve seat assembly, and the differences in the structure of the rotor and sun gear. The structures of other components, such as the planetary gears and the gear slider, can be understood with reference to the first embodiment. To avoid excessive length, these components will not be described in detail again. Furthermore, to facilitate understanding of this embodiment, components that are identical or similar in structure and function to those in the first embodiment are designated with the same reference numerals.

[0070] like Figure 18As shown, the electric valve provided in this embodiment includes a valve body 1 and a stator coil (not shown). The valve body 1 includes a valve seat assembly 11, a rotor 12, and a valve shaft 14. The stator coil of the electric valve is connected to a drive controller. When the drive controller is energized, it sends a pulse drive signal to the stator coil, generating 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 to the sun gear 13. Specifically, the limited connection can be provided by providing 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. The sun gear 13 is then installed from the bottom of the rotor, so that the rib and the groove cooperate to achieve relative positioning of the two in the circumferential direction, thereby allowing the sun gear 13 to rotate together with the rotor 12 under the drive of the rotor 12. This embodiment provides a rotor and sun gear combination different from the first embodiment. The sun gear is provided with a through hole 131 passing through its center. The valve shaft 14 is inserted into the through hole 131 and fixedly connected to the valve seat assembly.

[0071] The sleeve component includes a first sleeve component 151 and a second sleeve component 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 component can be a combination of the first sleeve component and the second sleeve component 152, or can be stamped from a metal sheet. Different from the first embodiment, the top wall portion 1511 is roughly flat and does not have a raised portion 1511a. The sleeve 160 has a pressing surface portion 1601 that fits with the inner wall of the top wall portion 1511 and can achieve planar abutment with the top wall portion 1511. The sleeve 160 is also provided with a valve shaft fitting portion 1602. Specifically, the valve shaft fitting portion 1602 is a hole provided on 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.

[0072] The valve seat assembly 11 includes a first plate portion 111, a second plate portion 112, and a third plate portion 113. The detailed structures of the three plates can be found in the description of the first embodiment and will not be repeated here. The outer edge of the second plate portion 112 is provided with a positioning groove 1121 for mating with the bracket positioning portion 922 provided on the fixed gear bracket described below.

[0073] The fixed gear 9 includes a fixed gear body 91 and a fixed gear bracket 92. Figure 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 thin-walled, hollow, and cylindrical, and has a bracket upper end surface 926 and a bracket lower end surface 925. The bracket lower end surface 925 abuts the upper end surface of the second plate portion 112 after assembly. The bracket positioning portion 922 extends outward from the bracket lower end surface 925, protruding from the surface of the bracket lower end surface 925, and engages with a positioning groove 1121 provided on the outer edge of the second plate portion 112 to fix the relative position of the fixed gear bracket 92 and the second plate portion 112. The two can be fixedly connected by laser welding.

[0074] A protrusion 924 is provided on the inner circumferential 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 extending direction of the protrusion 924. Of course, the bracket positioning portion 922 can also be provided at another position on 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 rotational travel of the gear slider.

[0075] 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 Figure 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 larger 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 that matches the first inner circumferential wall 929. After assembly, it can abut against the bracket step portion 923 to achieve relative positioning of the fixed gear body 91 and the fixed gear bracket 92 in the axial direction.

[0076] The fixed gear body 91 is generally annular, with an outer diameter matching the inner diameter of the first inner circumferential wall 929 described above, and its height also matching the height of the first inner circumferential wall 929. Thus, after assembly, the lower end surface 914 of the fixed gear body 91 abuts against the bracket step 923, and the upper end surface 913 of the fixed gear body is substantially flush with the upper end surface 926 of the fixed gear bracket 92. To achieve relative circumferential positioning of the fixed gear body 91 and the fixed gear bracket 92, a retaining groove 912 is provided on the outer edge of the fixed gear body, and a corresponding retaining portion 927 is provided on the first inner circumferential wall 929. Specifically, the retaining groove 912 is recessed inwardly relative to the outer edge of the fixed gear body, while the retaining portion 927 protrudes outwardly relative to the first inner circumferential wall 929. Thus, after assembly, the retaining groove 912 engages with the retaining portion 927, thereby achieving relative circumferential positioning of the fixed gear body and the fixed gear bracket. In this embodiment, the number of the slots 912 and the stoppers 927 are both two and symmetrically distributed. In this way, during assembly, the fixed gear body 91 can be smoothly assembled with the fixed gear bracket regardless of the front and back sides. The inner edge of the fixed gear body is the fixed tooth 911, which is used to engage with the planetary gear set. Of course, the above-mentioned slots 912 and stoppers 927 are disclosed only as a specific embodiment. Various equivalent changes can also be made to the matching structure of the slots and stoppers. For example, a concave slot is provided on the first inner peripheral wall, and a convex stopper is provided on the outer edge of the fixed gear body, which can also achieve the purpose of circumferential limitation.

[0077] The fixed gear bracket 91 can be made of powder metallurgy and sintering, and the fixed gear body can be made of plastic integral injection molding, such as injection molding of polymer materials.

[0078] The following describes the assembly process of the electric valve of this embodiment. The valve seat assembly can be assembled and fixed as a single component. That is, the first plate portion 111, the second plate portion 112, the third plate portion 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 fixed to the valve seat assembly by either welding or press-fitting.

[0079] The fixed gear bracket 91 is then assembled to the valve seat assembly, with the bracket positioning portion 922 mating with the positioning groove 1121 of the second plate. A clearance fit is provided. The valve shaft 14 and the bracket step 923 are then positioned using a tool to ensure good concentricity between the fixed gear bracket 91 and the valve shaft 14. The fixed gear bracket 91 is then pressed against the second plate, with the bracket's lower end surface 925 abutting against the second plate's upper surface. Laser welding is then performed to securely connect the fixed gear bracket to the second plate.

[0080] Next, the gear slider is installed. Specifically, 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 contacts the mating surface 1134 of the third plate portion. The planetary gear set 18 is then partially installed into the gear slider 20, with the small-diameter gear 1832 of the planetary gear set 18 meshing with the slider gear portion 203, while the large-diameter gear 1831 is located above the gear slider 20.

[0081] Then, apply glue to the bracket step 923, install the fixed gear body 92 into the fixed gear bracket 91, align the slot portion 912 and the stop portion 927, and press them into place, so that the fixed gear body 92 is adhered and fixed to the fixed gear bracket 91, and the fixed teeth 911 are engaged with the outer side of the large diameter teeth 1831 of the planetary gear set. Then, install the rotor 12 with the sun gear 13, the spring 17, and the shaft sleeve 60; then install the sleeve component and weld the sleeve component to the valve seat assembly. Of course, in this step, in addition to gluing and fixing, 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 from the upper end surface. After the fixed gear body is installed, this extended portion is crimped to deform it, thereby confining the fixed gear body within the fixed gear bracket.

[0082] It should be noted that the above assembly sequence can also be adjusted accordingly. For example, the gear slider and planetary gears can be assembled first, and then the fixed gear bracket 91 and the valve seat assembly can be welded together. In other words, the above assembly process is only an example of an assembly method for the electric valve provided in this embodiment, and is not intended to limit the assembly sequence of the electric valve to a single sequence.

[0083] 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 component names are also introduced for the convenience of description and do not mean any limitation on the order of the components. In addition, in the various embodiments described in this specification, for each embodiment of a certain component or assembly, various combinations can be made if the conditions for combination are met, and are not limited to the technical features described in the embodiment. For example, a specific embodiment of the first plate-shaped portion described above can be combined with other embodiments 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 inventive work (for example, when two components or parts are combined, only adaptive structural adjustments known in the art are made) are all within the scope of protection of the claims of the present invention.

[0084] The above describes the electric valve provided by the present invention in detail. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is only intended to help understand the core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such 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 (1) comprises a valve seat assembly (11) and a gear slider (20); the valve seat assembly (11) comprises a first plate body (111), a second plate body (112), a third plate body (113), a first connecting pipe (114) and a second connecting pipe (115); the first plate body (111) is fixedly connected to the second plate body (112); and the third plate body (113) is fixedly connected to the second plate body (112); The third plate body (113) is provided with a mating surface (1134), the third plate body (113) comprises a flow regulating portion (1131) and a valve mouth portion (1132), the valve mouth portion (1132) passes through the third plate body (113), and the flow regulating portion is located on one side of the mating surface (1334) and is recessed inward relative to the mating surface (1334); The gear slider (20) is capable of abutting against the mating surface (1134) and rotating relative to the third plate portion (113) to change the flow cross-sectional area of the flow regulating portion (1131); The edge line of the flow regulating portion (1131) includes a first curve (1131a) and a second curve (1131b), the valve mouth portion (1132) has a valve mouth contour line (1132a), the first curve (1131a) and the second curve (1131b) both intersect with the valve mouth contour line (1132a), and the spacing between the first curve (1131a) and the second curve (1131b) gradually increases in a direction approaching the valve mouth portion (1132), the first curve (1131a) adopts an Archimedean spiral or a circular arc, and the second curve (1131b) adopts an Archimedean spiral, and the diameter φ of the valve mouth portion (1132) has a value range of 1.2 mm < φ < 2 mm.

2. The electric valve according to claim 1, wherein: The distance L1 between the first curve (1131a) and the second curve (1131b) at the end close to the valve mouth (1132) is in the range of 0.5 mm < L1 < 1 mm, and the distance L2 between the first curve (1131a) and the second curve (1131b) at the end away from the valve mouth (1132) is in the range of 0.05 mm < L2 < 0.15 mm.

3. The electric valve according to claim 1, wherein: The first curve (1131a) and the second curve (1131b) both intersect with the valve port contour line (1132a) on one side, and the first curve (1131a) and the second curve (1131b) are connected on the other side via a third curve (1131c), and the radius R of the third curve (1131c) has a value range of: 0.1mm<R<0.3mm.

4. The electric valve according to claim 3, wherein: The depth of the flow regulating portion (1131) at one end close to the third curve (1131c) gradually increases along the direction in which the flow regulating portion extends toward the valve mouth portion (1132).

5. The electric valve according to claim 4, wherein: The depth H1 of the flow regulating portion (1131) at one end close to the valve mouth portion (1132) satisfies the following conditions: 0.3 mm < H1 < 0.7 mm; the depth H2 of the flow regulating portion (1131) at one end close to the third curve (1131c) satisfies the following conditions: 0.3 mm < H1 < 0.7 mm.

6. The electric valve according to claim 1, wherein: A flow control portion (205) is provided at the bottom of the gear slider (20), and the flow control portion (205) is provided with a fitting surface (2051) and a notch portion (2052). The fitting surface (2051) fits with the mating surface (1134) of the third plate body. The gear slider (20) can rotate on the surface of the mating surface (1134), and the notch portion (2052) can connect part of the flow regulating portion (1131) with the valve cavity of the electric valve.

7. The electric valve according to claim 6, wherein: The gear slider (20) and the third plate body (113) have at least one relative position, and at least part of the axial projection of the notch portion (2052) overlaps with the axial projection of the valve mouth portion (1132). The valve port formed by the valve mouth portion (1132) is connected to the internal space of the first connecting pipe (114), and the inner diameter of the valve mouth portion (1132) limits the flow rate of the electric valve.

8. The electric valve according to claim 6, wherein: The gear slider (20) and the third plate portion (113) have at least one relative position, and there is no overlapping area between the axial projection of the notch portion (2052) and the axial projection of the valve mouth portion (1132), and between the axial projection of the notch portion (2052) and the axial projection of the flow regulating portion (1131), and the electric valve is in a closed state.

9. The electric valve according to claim 6, wherein: The gear slider (20) and the third plate portion (113) have at least one relative position, the axial projection of the notch portion (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 rate of the electric valve.

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