Refrigeration system and electric valve

Abstract

A refrigeration system, characterized in that it includes a compressor, an evaporator, a condenser, and an electric valve, and at least includes the following refrigerant flow path: the refrigerant flows out from the exhaust port of the compressor, passes through the condenser and flows out, and flows into the evaporator after being throttled by the electric valve, and returns to the air inlet of the compressor; the electric valve realizes: there is at least one relative position, and there is no overlapping area between the axial projection of the notch part and the axial projection of the valve mouth part, and between the axial projection of the notch part and the axial projection of the flow regulating part; there is at least one relative position, and there is a partial overlap between the axial projection of the notch part and the axial projection of the flow regulating part; there is at least one relative position, and the axial projection of the notch part and the axial projection of the flow regulating part form an overlapping area.

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 a refrigeration system that can achieve relatively small flow rate regulation and relatively large flow rate system application. To this end, one embodiment of the present invention adopts the following technical solutions:

[0004] A refrigeration system, characterized in that it includes a compressor, an evaporator, a condenser, and an electric valve, and includes at least the following refrigerant flow path: the refrigerant flows out from the exhaust port of the compressor, passes through the condenser and flows out, and flows into the evaporator after being throttled by the electric valve, and returns to the air inlet of the compressor;

[0005] The electric valve includes a valve seat assembly, a first connecting pipe, a second connecting pipe, and a gear slider. The valve seat assembly includes a mating surface. The valve seat assembly is provided with a flow regulating portion and a valve port portion. The valve port portion penetrates the valve seat body and communicates with the first connecting pipe. The first connecting pipe is communicated with the inlet of the evaporator; the second connecting pipe is communicated with the valve cavity of the electric valve; the gear slider includes a flow control portion, the flow control portion includes a notch portion, the flow control portion is in contact with the mating surface, and can rotate relative to the valve seat body; and achieves:

[0006] The gear slider and the valve seat body have at least one relative position, and there is no overlapping area between the axial projection of the notch and the axial projection of the valve port, and between the axial projection of the notch and the axial projection of the flow regulating portion;

[0007] The gear slider and the valve seat body have at least one relative position, and the axial projection of the notch and the axial projection of the flow regulating portion partially overlap;

[0008] The gear slider and the valve seat body have at least one relative position, and the axial projection of the notch and the axial projection of the valve port form an overlapping area.

[0009] On this basis, the present invention also provides an electric valve for realizing the above-mentioned refrigeration system functions.

[0010] The refrigeration system provided by the embodiment of the present invention can realize the full opening and full closing functions of the valve port, and can also realize the regulation of smaller flow rates. In one embodiment, the flow control range of the electric valve is 0.25-10L / min, and the full-open flow rate is not less than 200L / min, which realizes relatively small flow regulation and relatively large flow system application.

Brief Description of the Drawings

[0011] Figure 1 A cross-sectional schematic diagram of an embodiment of the present invention;

[0012] Figure 2 This is a top view of the matching structure of the valve seat assembly, the first connecting pipe, the second connecting pipe and the valve shaft provided in this embodiment;

[0013] Figure 3 for Figure 2 AA view;

[0014] Figure 4 A three-dimensional view of the matching structure of the valve seat assembly, the first connecting pipe, the second connecting pipe and the valve shaft provided in this embodiment;

[0015] Figure 5 This is a schematic perspective view of the structure of a fixed gear assembly provided by one embodiment of the present invention;

[0016] Figure 6 is a cross-sectional view of the structure of a fixed gear assembly provided by one embodiment of the present invention;

[0017] Figure 7 1 is a schematic diagram of the front view of the gear slider provided by the first embodiment of the present invention;

[0018] Figure 8 1 is a schematic diagram of the appearance of a gear slider provided by the first embodiment of the present invention from a reverse perspective;

[0019] Figure 9 is a schematic structural diagram of a planetary gear set provided in a first embodiment;

[0020] Figure 10 1 is a schematic diagram of an assembled planetary gear set according to an embodiment of the present invention;

[0021] 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 closed state;

[0022] Figure 12 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;

[0023] Figure 13 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;

[0024] Figure 14 It is a schematic diagram of a refrigeration system;

[0025] Figure 15 It is a flow curve diagram of a refrigeration system. [Specific implementation method]

[0026] 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.

[0027] 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.

[0028] 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, they can also be set as a limited 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 passing through its center. The valve shaft 14 is inserted into the through hole, 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 16 provided at the top of the valve body. Of course, the valve shaft 14 can be set to be directly fixedly connected 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.

[0029] 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.

[0030] One end of the sleeve 16 is limited or fixedly connected to the valve shaft 14, and the other end of the sleeve 16 abuts against the first top wall portion 1511, and the edge of the sleeve 16 can abut against the first side wall portion 1512, as shown in FIG. Figure 1 As shown, sleeve 16 ensures that the axis of the valve shaft and the central axis of the valve body are roughly aligned. A spring 17 is disposed between sleeve 16 and sun gear 13. Spring 17 provides a certain preload force on sun gear 13, restraining it 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 various structural combinations. Therefore, the lower end of the spring can also abut the rotor.

[0031] 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.

[0032] Please refer to Figure 2 , Figure 3 , Figure 4 , Figure 2 This is a top view of the matching structure of the valve seat assembly, the first connecting pipe, the second connecting pipe and the valve shaft provided in this embodiment. Figure 3 for Figure 2 AA view, Figure 4 A three-dimensional view of the valve seat assembly, first and second connecting pipes, and valve shaft provided in this embodiment. The valve seat assembly 11 provided in this embodiment includes a valve seat body 111 and a partition 112. The electric valve also includes a first connecting pipe 114 and a second connecting pipe 115, with the valve seat body 111 fixedly assembled with the first and second connecting pipes 114, 115. The first and second connecting pipes 114, 115 serve as inflow and outflow channels for the fluid medium in the electric valve, respectively, and are typically used for connection to system piping when installed in cooling and heating systems such as refrigerators, freezers, and air conditioners.

[0033] The valve seat body 111 is provided with a mounting hole 1111. In this embodiment, the mounting hole 1111 is a blind hole structure, that is, it does not penetrate the valve seat body 111. After assembly, the valve shaft 14 is inserted into the first hole 1111 and fixed. The valve seat body 111 is also provided with a first pipe mounting portion 1112 and a second pipe mounting portion 1113 on the other side of the mounting hole 1111. The first pipe mounting portion 1112 and the second pipe mounting portion 1113 are both through holes that penetrate 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 mounting portion 1112, and the second pipe 115 is fixedly connected to the first plate body 111 through the second pipe mounting portion 1113. In this embodiment, the through-holes of the first and second pipe mounting portions 1112 and 1113 are stepped. The stepped portions serve as positioning elements during installation. Specifically, after the first pipe 114 is inserted into the first pipe mounting portion 1112, it abuts against the stepped portions, ensuring adequate insertion depth. The outer edge of the valve body 111 is provided with a first and second stepped portions 1114 and 1115. During assembly, the second sidewall portion 1522 of the second sleeve member abuts and engages with the first stepped portion 1114, specifically by welding. The second stepped portion 1115 is used to position and engage with the fixed gear assembly described below.

[0034] The valve seat body 111 is further provided with a flow regulating portion 1116 and a valve opening 1117. The flow regulating portion 1116 is provided on the upper surface of the valve seat body 111, i.e., the mating surface 1134. The flow regulating portion 1116 is recessed inward relative to the mating surface 1134, forming a non-through groove-like structure. At one end of the groove, it is connected to the valve opening 1117. The valve opening 1117 penetrates the valve seat body and can communicate with the interior of the first connecting pipe 114. Fluid can flow from the second connecting pipe 115 into the valve cavity of the electric valve, flow along the flow regulating portion 1116, and exit the first connecting pipe 114 through the valve opening 1117. The valve opening 1117 forms a flow hole that penetrates the valve seat body 111, and the valve opening outline 1117a is formed on the mating surface 1134. On one side of the valve opening 1117, an inwardly recessed flow regulating portion 1116 is formed on the mating surface 1134. The flow regulating portion 1116 is shaped as a narrow, arcuate groove, with its edge defined by a first curve 1116a and a second curve 1116b. The first curve 1116a can be an Archimedean spiral or a circular arc. One end of the first curve 1116a intersects the valve opening contour line 1117a of the valve opening 1117 on the mating surface 1134 at point B. The second curve 1116b can be an Archimedean spiral. One end of the second curve 1116b intersects the valve opening contour line 1117a at point C. Thus, the spacing between the first curve 1116a and the second curve 1116b gradually increases as it approaches the valve opening 1117. Flow control unit 1116 is smaller overall than conventional needle valve flow control valves and is particularly suitable for precise regulation of small flow rates, such as refrigerant flow in refrigerator refrigeration systems. A gear slider, described below, engages with mating surface 1134 and rotates relative to the valve seat body to adjust the flow cross-sectional area of ​​the flow control unit.

[0035] Furthermore, the depth of the flow regulating portion 1116 can be configured so that it gradually increases along the extension direction of the valve opening 1117. As a specific embodiment, at the end near the valve opening 1117, the depth H1 of the flow regulating portion 1116 satisfies the following conditions: 0.3 mm < H1 < 0.7 mm. At the end near the third curve 1116c, the depth H2 of the flow regulating portion 1116 satisfies the following conditions: 0.05 mm < H2 < 0.15 mm. This allows for a widened regulation range at low flow rates, making flow regulation approach linear variation. In actual operation, the width and depth of the flow regulating portion 1116 can be configured accordingly based on the system flow requirements to meet different needs.

[0036] The diaphragm portion 112 is a roughly plate-like structure, fabricated using powder metallurgy. It includes a diaphragm body 1123, which is provided with a plurality of diaphragm through-holes 1121 extending vertically therethrough. A diaphragm boss 1122 is provided on one surface, protruding upwardly, to limit the initial position of the gear slider 20. The diaphragm portion 112 and the valve seat body 111 can be secured by welding, with the second pipe mounting portion 1113 axially opposed to, or at least partially opposed to, the diaphragm body 1123. It should be noted that the diaphragm body 1123 referred to herein refers to the physical portion excluding the diaphragm through-holes 1121. In this embodiment, the second connecting pipe mounting portion is completely opposite to the partition body 1123. Thus, high-pressure refrigerant flowing in from the second connecting pipe 115 does not directly enter the valve cavity, but is instead blocked by the partition body 1123. Consequently, the gear slider 20, which slides in contact with the surface of the valve seat body 111, is not directly impacted by the high-pressure refrigerant, thereby improving the operational stability of the electric valve. After the partition 112 and the valve seat body 111 are secured, a generally annular flow channel 116 is formed between them. After the high-pressure refrigerant flows in from the second connecting pipe 115, it is blocked and buffered by the partition body 1123, enters the flow channel 116, and then flows into the valve cavity of the electric valve through the plurality of partition through-holes 1121.

[0037] The partition boss 1122 is used to start the gear slider 20. Specifically, Figure 2 The shaded triangle shown is a triangle formed by connecting the central axis of the valve seat mounting hole portion 1111, the central axis of the valve mouth portion 1117 and one side end point of the partition portion boss 1122 at a certain cross section. The advantage of this arrangement is that since the relative positions of the valve seat mounting hole portion 1111 and the valve mouth portion 1117 are fixed, the relative positions of the partition portion boss 1122 and the valve seat can be positioned by tooling so that the shaded triangle shown in the figure always remains consistent, that is, the relative position is determined by three points. In other words, when mass production is carried out, excluding necessary assembly errors, the partition portion 112 can always maintain basically the same relative position with the valve seat body portion 111, thereby ensuring the relative position of the slider gear 20 and the valve mouth portion 1117, and the product consistency is relatively good, making the flow control of the electric valve more precise.

[0038] Please refer to Figure 5 、 Figure 6 , Figure 5 This is a three-dimensional schematic diagram of the fixed gear assembly structure provided by an embodiment of the present invention. Figure 6 1 is a cross-sectional view of the fixed gear assembly structure provided by an embodiment of the present invention. The fixed gear 19 includes a fixed gear body 191 and a fixed gear bracket 192. Figure 5As shown, the fixed gear bracket 192 can be made of stainless steel pipes or plates by stamping, rolling and welding. Specifically, the fixed gear bracket 192 is generally in the shape of a thin-walled hollow cylinder. Figure 5 As a reference, a plurality of bracket through-holes 1921 are formed on the upper peripheral wall of the fixed gear bracket 192. These bracket through-holes 1921 can be punched. The fixed gear bracket has an upper end surface 1922 and a lower end surface 1923. After assembly, the lower end surface 1923 abuts against the second step 1115 to limit the downward axial position of the fixed gear. The fixed gear bracket 192 can be fixedly connected to the valve seat body 111 by welding, such as laser welding.

[0039] The fixed gear body 191 is generally annular and can be manufactured using injection molding. Specifically, the fixed gear bracket 192 is placed into a pre-set mold, and the fixed gear body 191 is then injection molded. Due to the provision of the bracket through-hole 1921, a corresponding protrusion 1911 is formed on the outer peripheral wall of the fixed gear body. The protrusion 1911 tightly engages with the bracket through-hole 1921, securing the fixed gear body 191 and the fixed gear bracket 192 as a single unit, preventing them from loosening or falling off. The inner edge of the fixed gear body 191 comprises fixed teeth 1912, which are used to mesh with the planetary gear set 18 described below.

[0040] The fixed gear assembly provided in this embodiment includes a fixed gear bracket and a fixed gear body, wherein the fixed gear bracket is a sleeve structure with openings at both ends, which is easy to obtain materials, simple to process, and suitable for mass production, and the fixed gear body is directly placed in the mold as an insert in the fixed gear bracket for injection molding. The two are tightly combined and the product has good consistency. At the same time, the fixed gear bracket is made of metal material and is directly laser welded to the valve seat body to ensure reliable positioning of the fixed gear assembly in the axial direction. It should be noted that the fixed gear assembly provided in this embodiment can be applied to electric valve products with different structures, and the technical effects it produces do not depend on the valve seat structure, slider structure, etc. recorded in the above embodiment.

[0041] Please refer to Figure 7 、 Figure 8 , Figure 7 1 is a schematic diagram of the front view of the gear slider provided by the first embodiment of the present invention. Figure 8The 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 partition portion boss 1122 of the partition portion 112 and the central axis. That is, when the gear slider 20 rotates counterclockwise as shown in the figure to the extreme position, the first positioning portion 2021 abuts against one side of the partition portion boss 1122, preventing the gear slider from rotating further; when the gear slider 20 rotates clockwise as shown in the figure to the extreme position, the second positioning portion 2022 abuts against the other side of the partition portion boss 1122, 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 partition portion boss 1122. It should be noted that the length of the positioning portion 202 (i.e., the length along the circumference of the gear slider) can be adjusted according to the needs of the system.

[0042] The inner wall of the gear slider 20 is provided with a slider gear portion 203, which can be engaged with the planetary gear assembly described below and rotated by the planetary gear. The bottom of the gear slider 20 is provided with a flow control portion 205, and the flow control portion 205 has a certain height as a whole. Figure 7 As 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 valve seat body 111 and being rotatable relative to the fitting surface 1134. 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 valve seat body 111, the flow control portion 205 is located at the notch portion 2052 and does not contact the third plate portion 113, and the fluid can flow in or out of the space formed by the notch portion 2052.

[0043] Please refer to Figure 9 , Figure 9: 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.

[0044] 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. The end surface of the large-diameter gear 1831 of planetary gear 183 is provided with a number of relative positioning holes 1833. 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 teeth 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 teeth 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 speed 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 valve seat body 111, allowing the notch 2052 of the flow control portion to align with different portions of the flow regulating portion 1116 of the third plate portion, thereby achieving flow regulation.

[0045] Please refer to Figure 10 , Figure 10 This is a schematic diagram of the assembled planetary gear set according to one embodiment of the present invention. In this embodiment, the sun gear has 12 teeth, corresponding to the 24 poles of the motor rotor. This ensures virtually no phase deviation during assembly. The fixed gear has 48 fixed teeth, the planetary gear assembly's large-diameter gear 1831 has 18 teeth, and the small-diameter gear 1832 has 12 teeth. The slider gear has 42 internal teeth. Correspondingly, the number of positioning holes 1833 is 6, a common divisor of 48, 18, and 12. This design achieves a high transmission ratio of 1:21, using a smaller planetary gear transmission mechanism to achieve a higher transmission ratio. The planetary gear's large-diameter gear 1831 has 18 teeth, while the small-diameter gear has 12 teeth. This minimizes the output component space, thereby increasing the initial positioning space for the electric valve, miniaturizing the electric valve. This also increases the strength of the output transmission gear, improving product reliability. The positioning holes 1833 are used to determine the relative position and angle when assembling the gears to facilitate assembly operations. Figure 10As shown, during assembly, the lines connecting the three positioning holes 1833 of the three planetary gears to the midpoint of the planetary gear mechanism form an angle of 120 degrees. This allows the three planetary gears to easily mesh with the fixed gear or the slider gear. Because the positioning holes 1833 define the angle of the planetary gear teeth, smooth meshing is ensured during assembly, minimizing interference. That is, after positioning, the three planetary gears have a defined tooth orientation during assembly. They can be assembled with the fixed gear first and then with the inner gear ring of the gear slider, or they can be assembled with the inner gear ring of the gear slider first and then with the fixed gear.

[0046] The following combination Figure 11-15 To illustrate the process of flow regulation. Figure 11 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 12 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 13 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. Figure 14 This is a schematic diagram of a refrigeration system. Figure 15 It is a flow curve diagram of a refrigeration system.

[0047] like Figure 14 As shown, a refrigeration system includes a compressor A01, an evaporator A02, a condenser A03, and an electric valve A04, which constitute a basic refrigeration system circuit. At the same time, a filter A05 can also be set in the circuit to filter impurities in the refrigeration system to ensure the smooth operation of the system. In the refrigeration system, the electric valve mentioned above in this application replaces the capillary tube commonly used for throttling in ordinary refrigerator refrigeration systems, so that the refrigerant flow rate of the refrigeration circuit can be adjusted, such as Figure 15 As shown in the figure, when the electric valve is at the 10Ps (pulse) position, the flow rate is 0, and the electric valve is in a fully closed state. Figure 11 As shown, the second positioning portion 2022 of the gear slider 20 abuts against one side of the partition portion boss 1122. Figure 11 In the projection diagram shown, the axial projection of the notch 2052 provided in the flow control unit 2051 does not overlap with either the flow regulating unit 1116 or the valve opening 1117. This means that both the flow regulating unit 1116 and the valve opening 1117 are closely covered by the flow control unit 2051, preventing fluid from flowing into the flow regulating unit 1116. In this state, the electric valve is in a fully closed position. In other words, the gear slider 20 and the valve seat body 111 exist at least at one relative position where the axial projection of the notch 2052 does not overlap with either the axial projection of the valve opening 1117 or the axial projection of the notch 2052 and the flow regulating unit 1116.

[0048] like Figure 15 As shown in the figure, the electric valve is in the linear flow adjustment area in the range of 50Ps-500Ps, which controls the flow adjustment range. Figure 12 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 1116, which is the black area shown in the figure. The black area is a part of the flow regulating portion 1116. 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 1116 through the black area of ​​the flow regulating portion 1116, and then flow out from the valve port 1117. At this time, the cross-sectional area of ​​the black area determines the throttling flow of the electric valve. Those skilled in the art will understand that Figure 12 The figure shows a specific position of the gear slider. As the gear slider 20 rotates continuously, the cross-sectional area of ​​the corresponding black area will increase. This process is the flow adjustment process of the electric valve. At this time, the flow adjustment range is 0.25~10L / min. Figure 15 As shown. That is, there is at least one relative position between the gear slider 20 and the valve seat body 111, and the axial projection of the notch 2052 partially overlaps with the axial projection of the flow regulating portion 1116. The cross-sectional area of ​​the overlapping projections defines the flow rate of the electric valve. When the refrigerator is initially powered on, the evaporator evaporation temperature and the evaporator surface temperature are controlled to be in a condensation state by controlling the flow rate of the valve (0.25-10L / min). The freezer air is driven by a fan to pass through the evaporator to form convection. The cabinet is dehumidified for a set time. After the dehumidification process, the output flow of the electric valve is adjusted to control the evaporator evaporation temperature and the evaporator surface temperature to achieve cooling of the freezer cabinet. After the dehumidification process, the frost and ice formation on the evaporator surface can be reduced and slowed down, thereby improving the heat exchange efficiency, achieving rapid cooling of the refrigerator, and reducing energy consumption. For air-cooled refrigerators, the humidity in the refrigerator compartment can be increased and controlled by defrosting the evaporator and adjusting the evaporation temperature and evaporator surface temperature to prevent condensation. This can be achieved by controlling the fan and damper, thereby improving the freshness of the food. For direct-cooling refrigerators, multiple evaporators can be connected in series, with an electric valve installed at each evaporator inlet if necessary. Alternatively, multiple evaporators can be connected in parallel, with an electric valve installed at each evaporator inlet.

[0049] like Figure 15 As shown in the figure, the electric valve changes from flow regulation state to full open state at 500Ps-650Ps. The full open flow is not less than 200L / min. When the system is running in this state, the refrigerant path is: compressor A01 exhaust port → condenser A04 → filter A05 → electric valve A04 → evaporator A02 → compressor A01 intake port. Figure 13As shown, the gear slider 20 rotates counterclockwise until the first positioning portion 2021 abuts against the other side of the partition portion boss 1122, 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 1117 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 1117, as shown in FIG. Figure 13 As shown in the black area, the electric valve is fully open. Specifically, the gear slider 20 and the valve seat body 111 exist at least at one relative position, where at least a portion of the axial projection of the notch 2052 overlaps with the axial projection of the valve opening 1117. The valve opening formed by the valve opening 1117 communicates with the interior of the first connecting pipe 114, and the inner diameter of the valve opening 1117 defines the flow rate of the electric valve. In the overall operating state, the fully open electric valve allows for a large flow rate, creating a near-unthrottled state. Only gaseous refrigerant circulates in the pipeline. Under normal room temperature, the refrigerant flowing into the evaporator is close to ambient temperature, exchanging heat with the outer surface of the freezer compartment evaporator, thereby defrosting the evaporator.

[0050] The following describes the assembly process of the electric valve. In one embodiment, the valve seat assembly can be assembled and fixed into one assembly, that is, the valve seat body 111 and the partition portion 112 are assembled and then fixed by welding. Alternatively, the valve seat body 111 is first welded to the first connecting pipe 114 and the second connecting pipe 115 and then welded to the partition portion 112. The valve shaft 14 can be fixed 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 valve seat. Then, the planetary gear set 18 is 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, while the large diameter tooth 1831 is located above the gear slider 20. Next, install the fixed gear 19 from above, ensuring that the fixed gear portion 1912 meshes with the outer sides of the large-diameter teeth 1831 of the planetary gear set. Next, weld the fixed gear bracket 192 to the valve seat body. Next, install the rotor 12 with the sun gear 13, the spring 17, and the bushing 16; and finally, the sleeve assembly.

[0051] Alternatively, another assembly method can be used: first assemble and secure the valve seat assembly into a single component, that is, assemble the valve seat body 111 and the partition 112, and then secure them by welding. Alternatively, the valve seat body 111 can be first welded to the first and second connecting pipes 114, 115, and then welded to the partition 112. The valve shaft 14 can be secured to the valve seat assembly by welding or press-fitting. Prepare the fixed gear assembly. Place the fixed gear bracket as an insert into the mold to injection mold the fixed gear body. Assemble the planetary gear assembly to the fixed gear assembly. Using a positioning fixture, ensure that the angle between the positioning holes of each of the three planetary gears and the midpoint of the planetary gear assembly is 120 degrees. Then, mesh with the fixed gear assembly. Assemble the gear slider to the planetary gear assembly. Then, install the fixed gear assembly, planetary gear assembly, and gear slider as a whole along the valve shaft, so that the fitting surface of the gear slider fits the mating surface of the valve seat body. Mesh the outer side of the large-diameter gear of the planetary gear assembly with the fixed gear. Secure the fixed gear bracket to the valve seat assembly by laser welding. Then, install the rotor 12 with the sun gear 13, the spring 17, and the shaft sleeve 16. Finally, install the sleeve component.

[0052] In the above two assembly methods, the sleeve component can be prepared by separately preparing the first and second sleeve components and then welding them together as described in the first embodiment, or it can be stamped into an integral sleeve component. The sleeve component includes 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 then welded to the valve seat assembly.

[0053] 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 and valve seat assembly can be welded together. In other words, the above assembly process is only an example of the assembly method of the electric valve provided in this embodiment, and is not intended to limit the assembly sequence of the electric valve to a single sequence.

[0054] It should be noted that the directional terms such as "up," "down," "left," and "right" mentioned in this embodiment are all based on the drawings in this specification and are introduced for ease of description. Ordinal numbers such as "first" and "second" in component names are also introduced for ease of description and do not imply any limitation on the order of the components. Furthermore, in the various embodiments described in this specification, various embodiments of a particular component or assembly can be combined in various ways, provided that the conditions for combining them are met, and are not limited to the technical features described in that embodiment. For example, a specific embodiment of the valve seat body 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 resulting from the permutation and combination of each different technical feature as separate embodiments. However, those skilled in the art should understand that new technical solutions formed by combining technical features without inventive effort (for example, by making only adaptive structural adjustments known in the art when combining two components or parts) are within the scope of protection of the claims of the present invention.

[0055] 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. A refrigeration system, characterized in that: The invention comprises a compressor (A01), an evaporator (A02), a condenser (A03), and an electric valve (A04), and at least comprises the following refrigerant flow path: the refrigerant flows out from the exhaust port of the compressor (A01), passes through the condenser (A03), flows out, and flows into the evaporator (A02) after being throttled by the electric valve (A04), and returns to the air inlet of the compressor (A01); The electric valve (A04) includes a valve seat assembly, a first connecting pipe, a second connecting pipe, and a gear slider. The valve seat assembly includes a mating surface. The valve seat assembly is provided with a flow regulating portion and a valve port portion. The valve port portion penetrates the valve seat body portion and is in communication with the first connecting pipe. The first connecting pipe is in communication with the inlet of the evaporator (A02). The second connecting pipe is in communication with the valve cavity of the electric valve. The inner peripheral wall of the gear slider is provided with a slider gear portion. The bottom of the gear slider is provided with a flow control portion. The flow control portion includes a notch portion. The flow control portion is in contact with the mating surface and can rotate relative to the valve seat body portion. The following are achieved: The gear slider and the valve seat body have at least one relative position, and there is no overlapping area between the axial projection of the notch and the axial projection of the valve port, and between the axial projection of the notch and the axial projection of the flow regulating portion; The gear slider and the valve seat body have at least one relative position, and the axial projection of the notch and the axial projection of the flow regulating portion partially overlap; The gear slider and the valve seat body have at least one relative position, and the axial projection of the notch and the axial projection of the valve port form an overlapping area; When the electric valve is in the range of 50Ps~500Ps, the flow rate changes linearly, and the flow rate adjustment range is 0.25L / min~10L / min; when the electric valve is in the range of 500Ps~650Ps, the electric valve changes from the flow rate adjustment state to the fully open state, and the fully open flow rate is not less than 200L / min.

2. The refrigeration system according to claim 1, wherein: When the electric valve is at the 10Ps position, there is no overlapping area between the axial projection of the notch and the axial projection of the valve mouth, and between the axial projection of the notch and the axial projection of the flow regulating part, and the electric valve is in a fully closed state.

3. An electric valve used in the refrigeration system according to claim 1 or 2, characterized in that: The invention comprises a valve seat assembly, a first connecting pipe, a second connecting pipe, and a gear slider. The valve seat assembly comprises a valve seat body and a partition. The valve seat body is welded and fixed to the partition. The partition is provided with a through hole of the partition. The valve seat assembly comprises a mating surface. The valve seat assembly is provided with a flow regulating portion and a valve port. The valve port passes through the valve seat body and is in communication with the first connecting pipe, and the second connecting pipe is in communication with the valve cavity of the electric valve. The gear slider comprises a flow control portion, the flow control portion comprises a notch, the flow control portion is in contact with the mating surface, and can rotate relative to the valve seat body. The gear slider includes a slider gear portion and a flow control portion, the flow control portion is in contact with the valve seat body portion and can rotate relative to the valve seat body portion; the gear slider includes a body portion and a positioning portion protruding from the outer edge portion of the body portion, the positioning portion includes a first positioning portion and a second positioning portion; the gear slider is coaxially arranged with the fixed gear, the partition portion includes a partition portion boss, and the gear slider abuts against the protrusion through the first positioning portion and the second positioning portion during rotation.

4. The electric valve according to claim 3, wherein: It includes a rotor, a sun gear and a valve shaft, the rotor is fixedly connected or limit-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 limit-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 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.

5. The electric valve according to claim 4, wherein: The fixed gear bracket is made of a stainless steel pipe, the fixed gear body and the fixed gear bracket are injection-molded into an integral structure, and the fixed gear bracket is welded and fixed to the valve seat assembly.

6. The electric valve according to claim 4, wherein: The planetary gear includes a large diameter gear and a small diameter gear. A positioning hole is provided on one end face of the large diameter gear. The inner side of the large diameter gear is engaged with the sun gear, the outer side of the large diameter gear is engaged with the fixed teeth of the fixed gear, and the small diameter gear is engaged with the slider gear part of the gear slider.

7. The electric valve according to any one of claims 4 to 6, characterized in that: The number of teeth of the sun gear is 12, the number of fixed teeth of the fixed gear is 48, the number of teeth of the large-diameter gear is 18, the number of teeth of the small-diameter gear is 12, and the number of teeth of the slider gear portion is 42.

8. The electric valve according to claim 6, wherein: The number of the planetary gears is 3, the number of the positioning holes of each planetary gear is 6, and the angle between the lines connecting at least one positioning hole of each planetary gear and the center of the planetary gear mechanism is 120 degrees.

Images