Electric valve, refrigerating system and refrigerator

Abstract

The embodiment of the invention provides an electric valve, a refrigerating system and a refrigerator, in the refrigerating system, an evaporator, a compressor and a condenser are sequentially connected in series; the condenser is connected to a first inlet of the electric valve; a first outlet and a second inlet of the electric valve are respectively connected with two ends of the anti-condensation pipe; a second outlet of the electric valve is connected with the evaporator through a second capillary tube; a third outlet of the electric valve is connected with the evaporator through a first capillary tube; the electric valve can rotate to be switched among the anti-condensation pipe starting state, the anti-condensation pipe closing state, the first quick-freezing state, the second quick-freezing state and the full-closing state, the anti-condensation pipe can be controlled to be started and stopped according to the environment humidity, and the condensation phenomenon is not prone to occurring around the refrigerator lining; the energy consumption of the refrigerator can be reduced, and energy loss is reduced; furthermore, after a large amount of food is put into the refrigerator, the refrigerator is correspondingly switched to a quick-freezing state, the chamber temperature is quickly reduced, and food preservation is facilitated.

Description

Technical Field

[0001] This application relates to refrigeration technology, and more particularly to an electric valve, a refrigeration system, and a refrigerator. Background Technology

[0002] Most refrigerator models use a vapor compression refrigeration system. This system consists of a compressor, condenser, filter, and evaporator connected sequentially. The compressor drives the refrigerant to flow through the condenser and evaporator, causing pressure and phase changes, thus transferring heat between the inside and outside of the refrigerator. There is a significant temperature difference between the internal compartments of the refrigerator and the surrounding environment. The perimeter of the refrigerator door is below the dew point temperature, making it prone to condensation. A common design solution is to place a portion of the condenser coil at the junction of the low-temperature compartment and the door seal. This utilizes the heat from the refrigerant within the condenser coil to locally heat the areas prone to condensation; this portion of the condenser coil is also known as the anti-condensation coil.

[0003] When the ambient humidity is high, the risk of condensation on the refrigerator door seals is greater, requiring higher temperatures to suppress it. However, the anti-condensation coils in traditional refrigerator refrigeration systems heat up in sync with the compressor operation, making it impossible to adjust the heating amount of the anti-condensation coils according to the ambient humidity requirements. Excessive temperature of the anti-condensation coils increases the refrigerator's heat load, resulting in greater energy consumption.

[0004] In addition, the evaporator temperature in a refrigerator is low, causing humid and hot air to condense and form frost on the evaporator fins. If the frost layer accumulates too thickly, it will reduce the heat exchange efficiency of the evaporator, causing malfunctions such as frost blockage and fan blade jamming. Therefore, automatic defrosting must be performed in a timely manner. Currently, the defrosting method for evaporators in air-cooled refrigerators is mainly electric heating. However, the thermal efficiency of electric heaters for defrosting is only 20% to 30%. Excess heat will enter the freezer compartment, causing excessive temperature fluctuations inside the refrigerator, which is detrimental to food preservation.

[0005] In addition, when a large number of items are suddenly put into the refrigerator, the temperature inside the compartment rises sharply, causing large temperature fluctuations. It will take a long time to lower the temperature to the required level using traditional refrigeration methods, which is also not conducive to food preservation.

[0006] On the other hand, refrigerators are required to adapt to different operating conditions and application scenarios, such as different ambient temperatures, differences in the amount of items stored by users and the frequency of door opening, all of which must ensure a constant temperature in the compartment. Therefore, the selection of refrigerator compressor cooling capacity must have sufficient redundancy. When the ambient temperature is high or the door opening frequency is high, the compressor runs for a long time and stops for a short time. In low ambient temperature or low door opening frequency environments, the compressor runs for a short time and starts and stops frequently. During the compressor's shutdown phase, the hot refrigerant in the condenser migrates to the evaporator, and the refrigeration system generates more energy loss during the compressor's start-up pressure rebuilding phase. Summary of the Invention

[0007] To address one of the aforementioned technical deficiencies, this application provides an electric valve, a refrigeration system, and a refrigerator.

[0008] According to a first aspect of the embodiments of this application, a refrigeration system is provided, comprising: a compressor, a condenser, an evaporator, an anti-condensation tube, a first capillary tube, a second capillary tube, and an electric valve; the electric valve has a first inlet, a second inlet, a first outlet, a second outlet, and a third outlet; the flow rate of the first capillary tube is greater than the flow rate of the second capillary tube; the evaporator, the compressor, and the condenser are connected in series; the condenser is connected to the first inlet of the electric valve;

[0009] The first outlet of the electric valve is connected to one end of the anti-condensation tube, and the second inlet of the electric valve is connected to the other end of the anti-condensation tube; the second outlet of the electric valve is connected to one end of the second capillary tube, and the other end of the second capillary tube is connected to the evaporator; the third outlet of the electric valve is connected to one end of the first capillary tube, and the other end of the first capillary tube is connected to the evaporator.

[0010] The electric valve can be rotated to switch between the anti-condensation tube activated state, the anti-condensation tube closed state, the first quick-freezing state, the second quick-freezing state, and the fully closed state.

[0011] When the anti-condensation pipe is in operation, the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet;

[0012] When the anti-condensation pipe is closed, the first outlet is closed, and the first inlet is connected to the second outlet.

[0013] In the first quick-freezing state, the first inlet is connected to the first outlet, and the second inlet is connected to the third outlet;

[0014] In the second quick-freezing state, the first outlet is closed; the first inlet is connected to the second and third outlets;

[0015] In the fully closed state, the first exit, the second exit, and the third exit are all disconnected.

[0016] According to a second aspect of the embodiments of this application, a refrigerator is provided, including: the refrigeration system as described above.

[0017] According to a third aspect of the embodiments of this application, an electric valve is provided, comprising:

[0018] The valve seat has through holes that extend along the axial direction, and each through hole is connected to a refrigeration pipeline. There are five through holes, including a first inlet and a second inlet for refrigerant to flow into the electric valve, and a first outlet, a second outlet and a third outlet for refrigerant to flow out of the electric valve.

[0019] The valve cover has an open end and a closed end; the open end of the valve cover is connected to the valve seat.

[0020] The drive motor includes a rotor and a stator, wherein the stator is disposed on the outer wall of the valve cover and the rotor is disposed inside the valve cover;

[0021] The gear transmission assembly is located inside the valve cover and is connected to the rotor;

[0022] A switch plate is disposed between the gear transmission assembly and the valve seat; the center of the end face of the switch plate facing the valve seat is recessed inward to form a guide groove; the switch plate has a through groove that extends through its own thickness; the switch plate is connected to the gear transmission assembly, and during rotation, the switch plate connects the inlet and outlet on the valve seat through the through groove, or connects the inlet and outlet on the valve seat through the guide groove, or closes the inlet and outlet on the valve seat.

[0023] The refrigeration system provided in this application embodiment uses an electric valve to switch between five states: first quick-freeze state, second quick-freeze state, anti-condensation tube activated, anti-condensation tube closed, and fully closed state. This not only controls the activation and deactivation of the anti-condensation tube according to the ambient humidity, making it less likely for condensation to occur around the refrigerator lining, but also reduces the refrigerator's heat load. Furthermore, when a large amount of food is placed in the refrigerator, the system switches to quick-freeze state accordingly to rapidly lower the compartment temperature, which is beneficial for food preservation. Additionally, the electric valve can switch to the fully closed state to achieve the condenser pressure-holding function, reducing the refrigerator's energy consumption.

[0024] In addition, the electric valve provided in this embodiment includes: a valve seat with through holes extending axially, each through hole being connected to a refrigeration pipeline; the number of through holes is five, including a first inlet and a second inlet for refrigerant to flow into the electric valve, and a first outlet, a second outlet, and a third outlet for refrigerant to flow out of the electric valve; a valve cover with one open end and the other closed end; the open end of the valve cover is connected to the valve seat; a drive motor including: a rotor and a stator, the stator being disposed on the outer wall of the valve cover, and the rotor being disposed inside the valve cover; a gear transmission assembly disposed inside the valve cover and connected to the rotor; a switch plate disposed between the gear transmission assembly and the valve seat; the end face of the switch plate facing the valve seat is recessed inward to form a guide groove; the switch plate has a through groove extending through its own thickness; the switch plate is connected to the gear transmission assembly, and during rotation, the switch plate connects the inlet and outlet on the valve seat through the through groove, or connects the inlet and outlet on the valve seat through the guide groove, or closes the inlet and outlet on the valve seat. By controlling the flow of refrigerant in different refrigeration pipes through electric valves, various functions of the refrigerator can be realized, which is conducive to achieving flexible control and multi-functionality. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1A front view of a refrigerator provided in an embodiment of this application;

[0027] Figure 2 A left sectional view of a refrigerator provided in an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of the structure of the electric valve provided in an embodiment of this application;

[0029] Figure 4 An exploded view of a portion of the structure of the electric valve provided in an embodiment of this application;

[0030] Figure 5 This is a cross-sectional view of a portion of the structure of the electric valve provided in an embodiment of this application;

[0031] Figure 6 A cross-sectional view of an electric valve provided in an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the gear transmission assembly in the electric valve provided in the embodiments of this application;

[0033] Figure 8 This is a schematic diagram of the meshing structure of the planetary gear and the gear ring in the electric valve provided in the embodiments of this application;

[0034] Figure 9 This is a schematic diagram of the gear transmission assembly meshing with the gear ring in an electric valve provided in an embodiment of this application;

[0035] Figure 10 This is a schematic diagram of the structure of the electric valve in which the switch piece is installed inside the valve cover, as provided in the embodiments of this application;

[0036] Figure 11 This is a schematic diagram of the structure of the switch plate in the electric valve provided in the embodiments of this application;

[0037] Figure 12 A cross-sectional view of the switching piece in the electric valve provided in an embodiment of this application;

[0038] Figure 13 This is a schematic diagram of the structure of the valve seat and the switch plate in the electric valve provided in the embodiments of this application;

[0039] Figure 14 A schematic diagram of the refrigeration system provided in the embodiments of this application in a first quick-freezing state;

[0040] Figure 15 A schematic diagram of the refrigeration system provided in an embodiment of this application in a second quick-freezing state;

[0041] Figure 16 A schematic diagram showing the refrigeration system in the anti-condensation pipe activation state according to an embodiment of this application;

[0042] Figure 17 A schematic diagram showing the refrigeration system in the anti-condensation pipe closed state according to an embodiment of this application;

[0043] Figure 18 A schematic diagram of the refrigeration system provided in the embodiments of this application in the fully off state;

[0044] Figure 19 This is a schematic diagram of the refrigeration system provided in the embodiment of this application in the third quick-freezing state.

[0045] Figure label:

[0046] 10 - Electric valve; 20 - Refrigerator door; 30 - Freezer door; 40 - Refrigerator compartment; 50 - Freezer compartment;

[0047] 1-Valve seat; 11-First inlet; 12-Second inlet; 13-First outlet; 14-Second outlet; 15-Third outlet; 17-Pipe fitting;

[0048] 2-Valve cover; 21-Gear ring; 22-Central shaft; 23-Fixing plate; 24-Spring;

[0049] 31-Stator; 32-Rotor;

[0050] 4-Gear transmission assembly; 41-Sun gear; 411-Main body; 412-Fixing part; 42-Planet gear; 43-Gear carrier; 44-Riveting component; 45-Mandrel;

[0051] 5-Switch piece; 51-Through groove; 52-Guide groove; 53-Switch protrusion;

[0052] 61-Compressor; 62-Condenser; 63-Evaporator;

[0053] 7-Anti-condensation pipe;

[0054] 81 - First capillary; 82 - Second capillary. Detailed Implementation

[0055] To make the technical solutions and advantages of the embodiments of this application clearer, the exemplary embodiments of this application will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not an exhaustive list of all embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other.

[0056] This embodiment provides an electric valve and a refrigeration system and refrigerator using the electric valve, which can reduce the probability of condensation at the door seal of the refrigerator compartment when the ambient humidity is high, reduce energy consumption, and further achieve quick freezing and reduce the temperature fluctuation of the compartment.

[0057] A refrigerator consists of a cabinet, a refrigeration system, and an electric valve. The cabinet contains compartments, which can be a refrigerator compartment, a freezer compartment, or a variable temperature compartment. The refrigeration system generates cooling to lower the temperature within each compartment; the electric valve is connected to the refrigeration piping of the refrigeration system and is used to adjust the flow of refrigerant in the piping.

[0058] like Figure 1 and Figure 2 A refrigerator with two doors was shown, with the upper compartment being a refrigerator compartment and the lower compartment a freezer compartment. Figure 1 The image shows refrigerator door 20 and freezer door 30. Figure 2 The refrigerator compartment 40 and the freezer compartment 50 are shown. Anti-condensation pipes 7 are installed near the refrigerator compartment door 20 and the freezer compartment door 30. The layout of the anti-condensation pipes 7 can be achieved using existing solutions. An evaporator 63 and a compressor 61 are installed at the rear of the freezer compartment 50.

[0059] Figure 1 and Figure 2 This is merely an example; the technical solution provided in this embodiment can also be applied to refrigerators with three doors (top and bottom), four doors (left and right), or four doors (cross-shaped).

[0060] Reference Figures 3 to 6 The electric valve shown in this embodiment has a rotating structure, where the axial direction refers to the direction of the axis of rotation. Figure 6 The up and down directions in the middle.

[0061] The electric valve includes: valve seat 1, valve cover 2, drive motor, gear transmission assembly 4, and switch plate 5. The valve seat 1 has through holes that extend axially, and each through hole is connected to a refrigeration pipeline, so that refrigerant can flow from one refrigeration pipeline into the electric valve through the through holes, or the refrigerant in the electric valve can flow through the through holes to the corresponding refrigeration pipeline.

[0062] In this embodiment, there are five through holes, including a first inlet 11 and a second inlet 12 for refrigerant to flow into the electric valve, and a first outlet 13, a second outlet 14, and a third outlet 15 for refrigerant to flow out of the electric valve. The first inlet 11, the second inlet 12, the first outlet 13, the second outlet 14, and the third outlet 15 are connected to the corresponding refrigeration pipelines.

[0063] The valve seat 1 can be a cylindrical structure, and the thickness of the valve seat 1 (i.e., the axial dimension) is smaller than its diameter. The first inlet 11, the second inlet 12, the first outlet 13, the second outlet 14, and the third outlet 15 are all connected to the pipe joints 17, and are connected to the corresponding refrigeration pipes through the pipe joints 17.

[0064] The valve cover 2 has an open end and a closed end, with its open end connected to the valve seat 1. An accommodating space is formed inside the valve cover 2. The valve cover 2 has a cylindrical structure, and the dimensions of its bottom circle match the dimensions of the valve seat 1, so that the two can be connected together and have good sealing performance, preventing external moisture from entering the accommodating space of the valve cover 2.

[0065] The drive motor includes a stator 31 and a rotor 32. The stator 31 is disposed on the outer wall of the valve cover 2 and is fixed relative to the valve cover 2. The rotor is disposed in the receiving space of the valve cover 2 and can rotate axially relative to the valve cover 2. Figure 3 To show the internal structure, the rotor is represented by dashed lines.

[0066] The gear transmission assembly 4 is disposed in the receiving space and connected to the rotor 32. The rotor 32 drives the gear transmission assembly 4 to rotate. The gear transmission assembly 4 serves to reduce the rotational speed.

[0067] A switch piece 5 is positioned between the gear transmission assembly 4 and the valve seat 1, and is connected to the gear transmission assembly 4. The gear transmission assembly 4 drives the switch piece 5 to rotate. The switch piece 5 has a through groove 51 extending through its own thickness, and the end face of the switch piece 5 facing the valve seat 1 is recessed inward to form a guide groove 52. A closed liquid space is formed within the guide groove 52. When the switch piece 5 rotates to a certain position, the corresponding inlet and outlet are exposed in the liquid space formed by the guide groove 52, allowing refrigerant to enter the guide groove 52 from the inlet and flow out of the guide groove 52 from the outlet.

[0068] A liquid channel is formed on the outer periphery of the through groove 51 in the switch piece 5. The refrigerant can remain in the liquid channel or flow in the liquid channel and is connected to the through groove 51. When the switch piece 5 is rotated to a certain position, the corresponding inlet and outlet are exposed in the liquid channel on the outer periphery of the through groove 51, so the refrigerant can enter the liquid channel from the inlet and flow out from the outlet.

[0069] The structure of the switch piece 5 with the through groove 51 and the guide groove 52 enables liquid to flow between different refrigeration pipes and controls the flow switch.

[0070] During rotation, the switch piece 5 connects the inlet and outlet of the valve seat 1 through the through groove 51, or connects the inlet and outlet of the valve seat 1 through the guide groove 52, or closes the inlet and outlet of the valve seat 1.

[0071] For example, when the switch piece 5 is rotated to the first position, the first inlet 11 and the first outlet 13 are connected, so that the refrigerant in one refrigeration pipeline enters the electric valve through the first inlet 11 and flows to another refrigeration pipeline through the first outlet 13.

[0072] When the switch piece 5 is rotated to the second position, the second inlet 12 is connected to the second outlet 14, so that the refrigerant in one refrigeration line enters the electric valve through the second inlet 12 and flows to another refrigeration line through the second outlet 14.

[0073] When the switch piece 5 is rotated to the third position, the second inlet 12 is connected to the third outlet 15, so that the refrigerant in one refrigeration line enters the electric valve through the second inlet 12 and flows to another refrigeration line through the third outlet 15.

[0074] When switch piece 5 rotates to the fourth position, it closes the first outlet 13, the second outlet 14, and the third outlet 15.

[0075] The technical solution provided in this embodiment includes an electric valve comprising: a valve seat having axially extending through holes, each through hole being connected to a refrigeration pipeline; the number of through holes is five, including a first inlet and a second inlet for refrigerant to flow into the electric valve, and a first outlet, a second outlet, and a third outlet for refrigerant to flow out of the electric valve; a valve cover having one open end and the other closed end; the open end of the valve cover being connected to the valve seat; a drive motor comprising: a rotor and a stator, the stator being disposed on the outer wall of the valve cover, and the rotor being disposed inside the valve cover; a gear transmission assembly disposed inside the valve cover and connected to the rotor; a switch plate disposed between the gear transmission assembly and the valve seat; the end face of the switch plate facing the valve seat is recessed inward to form a guide groove; the switch plate has a through groove extending through its own thickness; the switch plate is connected to the gear transmission assembly, and during rotation, the switch plate connects the inlet and outlet on the valve seat through the through groove, or connects the inlet and outlet on the valve seat through the guide groove, or closes the inlet and outlet on the valve seat. By controlling the flow of refrigerant in different refrigeration pipes through electric valves, various functions of the refrigerator can be realized, which is conducive to achieving flexible control and multi-functionality.

[0076] For example, switching the electric valve allows refrigerant at temperatures higher than ambient to pass through the anti-condensation pipe, reducing condensation. The anti-condensation pipe and compressor can also be shut off based on ambient humidity or temperature, thereby reducing refrigerator energy consumption. Switching the electric valve can also put the refrigerator into quick-freeze mode, reducing temperature fluctuations within the compartment in a short time, further reducing energy consumption. Those skilled in the art can apply the above-mentioned electric valves to achieve the corresponding functions as needed.

[0077] Based on the above technical solution, this embodiment illustrates the implementation method of the electric valve with an example:

[0078] The gear transmission assembly 4 serves to slow down the rotational speed of the switch piece 5 and increase its driving force to overcome the friction between the switch piece 5 and the valve seat 1. This can be adjusted by the transmission ratio between the gears. This embodiment provides one implementation method:

[0079] like Figures 3 to 9 As shown, the gear transmission assembly 4 includes a sun gear 41, planet gears 42, and a gear carrier 43. The sun gear 41 is connected to the rotor 32, which drives the sun gear 41 to rotate. The sun gear 41 is located in the middle of the gear carrier 43, and a spindle 45 is located around the periphery of the gear carrier 43. The planet gears 42 are connected to the spindle and surround the sun gear 41, meshing with it. A gear ring 21 is also provided on the inner wall of the valve cover 2, and the planet gears 42 mesh with the gear ring 21. The valve cover 2 and the gear ring 21 are interference-fitted.

[0080] The rotation of the sun gear 41 drives the planet gear 42 to rotate. While rotating on its own, the planet gear 42 also revolves relative to the valve cover 2, driving the wheel carrier 43 to rotate. The wheel carrier 43 is also connected to the switch piece 5, driving the switch piece 5 to rotate.

[0081] This embodiment provides an implementation of the sun gear 41, such as... Figures 3 to 6 As shown, the sun gear 41 includes a main body 411 and a fixing part 412, wherein the main body 411 extends axially. The fixing part 412 is disposed at one end of the main body 411 and extends radially outward, and the periphery of the fixing part 412 is fixedly connected to the rotor 32. The outer side wall of the end of the main body 411 opposite to the fixing part 412 is provided with teeth for meshing with the planet gear 42.

[0082] If the sun gear 41 is cut open along its axis, the sun gear 41 is T-shaped and the planet gear 42 is located below the fixed part 412. To a certain extent, this can also achieve the technical effect of reasonable structural layout and reduce the overall volume of the electric valve.

[0083] One implementation involves the use of permanent magnet powder, such as ferrite powder, in the injection molding material of the rotor 32. Specifically, strontium barium ferrite powder is uniformly mixed in plastic, poured into the rotor mold, and the rotor 32 is formed through injection molding. Then, the rotor 32 is magnetized to become a permanent magnet.

[0084] The sun gear 41 and the rotor 32 are integrated into one structure through injection molding. In specific operation, plastic can be injected into the mold of the sun gear 41.

[0085] Alternatively, the sun gear 41 and the rotor 32 can be made of other materials, obtained in other ways, and connected together by bolts, welding, or other methods.

[0086] Based on the above technical solution, a central shaft 22 is also adopted. One end of the central shaft 22 is fixedly installed inside the valve cover 2 and extends axially. Specifically, one end of the central shaft 22 can be fixed to the closed end of the valve cover 2. The sun gear 41 has a shaft hole in the middle, and the central shaft 22 is inserted into the shaft hole. The central shaft 22 and the sun gear 41 are clearance-fitted to allow the sun gear 41 to rotate relative to the central shaft 22. The central shaft 22 is used to limit the movement of the sun gear 41 and prevent the axis of the sun gear 41 from deviating.

[0087] Furthermore, a fixing plate 23 is used, which is disposed inside the valve cover 2 and located at the closed end. The fixing plate 23 is fixed to the closed end of the valve cover 2, and the middle part of the fixing plate 23 is provided with a shaft hole for the central shaft 22 to be inserted. The fixing plate 23 is used to fix the central shaft 22 and prevent the position of the central shaft 22 from being misaligned.

[0088] Furthermore, a spring 24 is used, sleeved on the outside of the central shaft 22 and pressed between the fixed plate 23 and the sun gear 41. The rebound force of the spring 24 causes the gear transmission assembly 4 to press tightly against the switch piece 5, thereby enabling the switch piece 5 to tightly cover the through hole on the valve seat 1 during rotation, achieving a sealing closure of the inlet or outlet and preventing refrigerant leakage.

[0089] The wheel frame 43 can be connected to the switch piece 5 by bolts, welding, or riveting. In this embodiment, the wheel frame 43 is provided with riveting holes, and is connected to the switch piece 5 by riveting parts 44.

[0090] The wheel frame 43 can specifically consist of an upper frame plate and a lower frame plate, which are parallel and opposite to each other, with a gap between them. The planetary gears 42 are disposed in the gap between the upper and lower frame plates. A spindle 45 is vertically disposed between the upper and lower frame plates, and the planetary gears 42 are sleeved on the spindle 45 and can rotate relative to the spindle 45.

[0091] The upper and lower frame plates are connected by riveting pieces 44 and are also connected to the switch piece 5. In this embodiment, three planetary gears 42 are used, corresponding to three spindles 45. The three spindles 45 and the three riveting pieces 44 are alternately arranged circumferentially and at equal intervals. This ensures that the three planetary gears 42 are subjected to uniform force and do not interfere with each other. It also ensures that the gear frame 43 is subjected to uniform force as a whole, improving the stability of its rotation process. This is beneficial for improving its reliability and reducing the risk of refrigerant leakage and the probability of failure.

[0092] In another embodiment, wheel frame 43 uses only an upper frame plate, which is connected to the upper frame plate using a switch piece 5. The switch piece 5 replaces the lower frame plate.

[0093] For switch piece 5, this embodiment also provides a specific implementation method: such as Figures 10 to 12As shown, a switch protrusion 53 is provided in the middle of the end face of the switch piece 5 facing the valve seat 1, and the surface of the switch protrusion 53 is in contact with the inner surface of the valve seat 1. A guide groove 52 is provided in the middle of the switch protrusion 53, and a liquid space is formed between the guide groove 52 and the inner surface of the valve seat 1. A through groove 51 is provided in the switch protrusion 53, or a through groove 51 with a thickness of 1 through is provided in the middle of the switch protrusion 53. The gap between the switch protrusion 53 and the valve cover 2 and the planetary gear serves as a liquid channel, and the liquid channel is connected to the through groove 51. The liquid channel is also connected to the first inlet 11 on the valve seat 1, and the refrigerant enters the liquid channel from the first inlet 11.

[0094] For example, when the switch piece 5 rotates to align the through groove 51 with the first outlet 13, the refrigerant in the liquid channel is discharged from the first outlet 13, thus connecting the first inlet 11 and the first outlet 13; when the switch piece 5 rotates to cover the first outlet 13 with the switch protrusion 53, the refrigerant cannot be discharged from the first outlet 13, thus disconnecting or closing the first inlet 11 and the first outlet 13.

[0095] When the switch piece 5 is rotated to the point where both the second inlet 12 and the second outlet 14 are located within the guide groove 52, the refrigerant in one refrigeration pipeline enters the guide groove 52 from the second inlet 12 and flows to the other refrigeration pipeline from the second outlet 14.

[0096] When the switch piece 5 is rotated to the point where both the second inlet 12 and the third outlet 15 are located within the guide groove 52, the refrigerant in one refrigeration pipeline enters the guide groove 52 from the second inlet 12 and flows to the other refrigeration pipeline from the third outlet 15.

[0097] When the switch piece 5 is rotated to the point where the second outlet 14 is located in the through slot 51, the refrigerant in one refrigeration pipe enters the through slot 51 from the first inlet 11 and flows to another refrigeration pipe from the second outlet 14.

[0098] When the switch piece 5 is rotated to the point where the third outlet 15 is located in the through slot 51, the refrigerant in one refrigeration pipe enters the through slot 51 from the first inlet 11 and flows to another refrigeration pipe from the third outlet 15.

[0099] Based on the above scheme, the positions of each inlet and outlet can be set according to the size of the switch protrusion 53 in the switch piece 5, the position and size of the through groove 51, and the position and size of the guide groove, so as to realize the connection between the corresponding inlet and outlet.

[0100] This embodiment provides one implementation method: as follows Figure 13As shown, the first inlet 11 is located on the periphery of the switch protrusion 53, so that the first inlet 11 is directly connected to the liquid channel on the periphery of the switch protrusion 53. The second inlet 12 is located at the center of the valve seat 1 and in the area covered by the guide groove 52. The first outlet 13 is located in the area rotatably covered by the through groove 51. The second outlet 14 is located in both the area rotatably covered by the through groove 51 and the area rotatably covered by the guide groove 52, enabling the second outlet 14 to connect with either the first inlet 11 or the second inlet 12. The third outlet 15 is located in both the area rotatably covered by the through groove 51 and the area rotatably covered by the guide groove 52, enabling the third outlet 15 to connect with either the first inlet 11 or the second inlet 12.

[0101] One embodiment is as follows: the guide groove 52 is an elongated structure, specifically an oblong shape, a gourd shape, etc., with one end located at the center of the switch protrusion 3, and the other end extending away from the through groove 51. The second inlet 12, the second outlet 14, and the third outlet 15 are all located within the range covered by the guide groove 52. The switch piece 5 can be rotated so that the guide groove 52 simultaneously covers the second inlet 12 and the second outlet 14, connecting them, or simultaneously covers the second inlet 12 and the third outlet 15, connecting them. Specifically, the second inlet 12 is located at the center of the switch protrusion 53, the second outlet 14 is near the edge of the switch protrusion 53, and the third outlet 15 is near the edge of the switch protrusion 53.

[0102] The second inlet 12 serves as the rotation center of the guide groove 52, and the guide groove 52 covers the second inlet 12 no matter where it rotates.

[0103] The first outlet 13 is close to the edge of the switch protrusion 53. The switch piece 5 can be rotated to the through groove 51 to cover the first outlet 13 so that the first outlet 13 is connected to the first inlet 11; or the switch piece 5 can be rotated to the through groove 51 to cover the second outlet 14 so that the second outlet 14 is connected to the first inlet 11; or the switch piece 5 can be rotated to the through groove 51 to cover the third outlet 15 so that the third outlet 15 is connected to the first inlet 11.

[0104] In this embodiment, with the rotation center of the switch protrusion as the center, the central angle formed between the first inlet 11 and the first outlet 13 is an acute angle; the central angle formed between the first inlet 11 and the second outlet 14 is an obtuse angle; the central angle formed between the second outlet 14 and the third outlet 15 is an acute angle; and the central angle formed between the first outlet 13 and the third outlet 15 is an obtuse angle.

[0105] Most refrigerators use crankshaft piston compressors, which have high-frequency pulsating exhaust. In the above solution, the central shaft 22 of the electric valve is fixed on the fixing plate 23 on the top of the valve cover 2, which allows the center position of the valve seat 1 to be set up for the second inlet 12. The direction of the refrigerant sprayed from the second inlet 12 is opposite to and coaxial with the clamping force of the compression spring 24, which reduces the flipping force of the pulsating airflow on the switch plate 5. This helps the switch plate 5 to fit tightly and reliably against the valve seat 1, reducing the risk of refrigerant leakage inside the electric valve.

[0106] The rotor 32 of the drive motor and the sun gear 41 are injection molded into a single structure. The sun gear 41 meshes with the planet gears 42 and rotates, which keeps the driving force of the planet gear 42 speed change mechanism uniform and also helps to reduce the risk of refrigerant leakage inside the electric valve.

[0107] Based on the above technical solution, this embodiment provides an application scheme for an electric valve, specifically a refrigeration system, such as... Figure 14 As shown, the refrigeration system includes: a compressor 61, a condenser 62, an evaporator 63, an anti-condensation tube 7, a first capillary tube 81, a second capillary tube 82, and an electric valve 10 provided by any of the above. The flow rate of the first capillary tube 81 is greater than the flow rate of the second capillary tube 82.

[0108] The factors affecting capillary flow rate are pipe diameter and length. If the diameter of the first capillary 81 is greater than the diameter of the second capillary 82, then the flow rate of the first capillary 81 is greater than that of the second capillary 82. If the length of the first capillary 81 is less than the length of the second capillary 82, then the flow rate of the first capillary 81 is greater than that of the second capillary 82. The evaporator 63, compressor 61, and condenser 62 are connected in series via refrigeration piping. The condenser 62 is connected to the first inlet 11 of the electric valve 10 via refrigeration piping. The first outlet 13 of the electric valve 10 is connected to one end of the anti-condensation pipe 7, and the second inlet 12 of the electric valve 10 is connected to the other end of the anti-condensation pipe 7.

[0109] The second outlet 14 of the electric valve 10 is connected to one end of the second capillary tube 82, and the other end of the second capillary tube 82 is connected to the evaporator 63; the third outlet 15 of the electric valve 10 is connected to one end of the first capillary tube 81, and the other end of the first capillary tube 81 is connected to the evaporator 63.

[0110] The electric valve 10 is driven to rotate by a drive motor, switching between a first quick-freezing state, a second quick-freezing state, an anti-condensation tube enabled state, an anti-condensation tube closed state, and a fully closed state.

[0111] like Figure 14 As shown, after a large number of items are placed in the freezer compartment or when the refrigerator is in the defrosting stop phase, the freezer compartment temperature exceeds the start-up temperature by about 3°C. At this time, the electric valve 10 switches to the first quick-freeze state. (Refer to...) Figure 6From the viewing angle, the electric valve 10 rotates until the through groove 51 is above the first outlet 13, so that the first inlet 11 is connected to the first outlet 13, and the guide groove 52 is above the second inlet 12 and the third outlet 15, so that the second inlet 12 and the third outlet 15 are connected.

[0112] The gaseous refrigerant discharged from the compressor passes through the condenser 62 to become a higher-temperature liquid refrigerant. The liquid refrigerant enters the electric valve 10 through the first inlet 11, and then enters the anti-condensation pipe 7 through the first outlet 13. The anti-condensation pipe 7 has the highest temperature, making it less likely for condensation to occur around the refrigerator lining. The temperature of the refrigerant in the anti-condensation pipe 7 is higher than the dew point temperature, for example, 5℃-12℃ higher than the ambient temperature.

[0113] It is understandable that the refrigerant in condenser 62 is generally a two-phase flow, with the proportion of liquid gradually increasing. Therefore, the liquid refrigerant passing through anti-condensation tube 7 still contains a small amount of air bubbles and is not a pure liquid.

[0114] The refrigerant coming out of the anti-condensation tube 7 enters the electric valve 10 through the second inlet 12, flows out of the electric valve 10 through the third outlet 15, flows through the first capillary tube 81 and the evaporator 63 in sequence to cool the refrigerator compartment, and then returns to the compressor 61, forming a large circulation of refrigerant through the anti-condensation tube 7 and the evaporator 63.

[0115] Because the refrigerant flow rate in the first capillary tube 81 is relatively large, it can increase the cooling capacity of the compressor, thereby causing the refrigerator temperature to drop rapidly, which is beneficial for food preservation.

[0116] like Figure 15 As shown, after a large number of items are placed in the freezer compartment, the freezer compartment temperature exceeds the start-up temperature by about 10°C. At this time, the electric valve 10 switches to the second quick-freeze state. The electric valve 10 rotates until the through groove 51 is located above the second outlet 14 and the third outlet 15, so that the first inlet 11 is connected to both the second outlet 14 and the third outlet 15, and the guide groove 52 only covers the second inlet 12.

[0117] The refrigerant discharged from the compressor enters the electric valve 10 through the first inlet 11 after passing through the condenser 62, and then flows out from the second outlet 14 and the third outlet 15 respectively. After passing through the first capillary tube 81 and the second capillary tube 82 respectively, it enters the evaporator 63 to cool the refrigerator compartment before returning to the compressor 61.

[0118] The first capillary tube 81 and the second capillary tube 82 pass through the refrigerant in parallel, resulting in the maximum flow rate of the refrigerant. This increases the cooling capacity of the compressor and causes the refrigerator temperature to drop faster. This is beneficial for room-temperature meat products to quickly pass through the ice crystal formation zone, reducing cell wall damage and promoting food preservation.

[0119] like Figure 16As shown, when the refrigerator's humidity sensor detects that the ambient humidity is greater than 60% RH, the electric valve 10 rotates to the anti-condensation tube activation state. Specifically, the electric valve 10 rotates until the through groove 51 is above the first outlet 13, so that the first inlet 11 is connected to the first outlet 13, and the guide groove 52 is above the second inlet 12 and the second outlet 14, so that the second inlet 12 and the second outlet 14 are connected.

[0120] The gaseous refrigerant discharged from the compressor is converted into a liquid refrigerant with a higher temperature after passing through the condenser 62. The liquid refrigerant enters the electric valve 10 from the first inlet 11 and then enters the anti-condensation pipe 7 from the first outlet 13. The anti-condensation pipe 7 has the highest temperature, which makes it less likely for condensation to occur around the refrigerator lining.

[0121] The refrigerant exiting from the anti-condensation tube 7 then enters the electric valve 10 through the second inlet 12 and exits from the electric valve 10 through the second outlet 14. It then flows sequentially through the second capillary tube 82 and the evaporator 63 to cool the refrigerator compartments before returning to the compressor 61, forming a large circulation loop of refrigerant through the anti-condensation tube 7 and the evaporator 63. Furthermore, because the refrigerant flow rate through the second capillary tube 82 is relatively small, the evaporation temperature of the refrigeration system is low, which is beneficial for maintaining the long-term freshness of low-temperature foods.

[0122] like Figure 17 As shown, when the refrigerator's humidity sensor detects that the ambient humidity is less than 40% RH, the electric valve 10 rotates to the anti-condensation tube closed state. Specifically, the electric valve 10 rotates until the switch protrusion 53 of the switch piece 5 covers the first outlet 13, closing the first outlet 13. Furthermore, the second inlet 12 is not connected to any outlet, thus closing both the inlet and outlet of the anti-condensation tube 7, preventing refrigerant in the condenser from migrating to the anti-condensation tube 7, and avoiding system "liquid shortage" affecting normal refrigeration performance. The through slot 51 of the switch piece 5 covers the second outlet 14, connecting the second outlet 14 to the first inlet 11. The refrigerant output from the condenser 62 then enters the electric valve 10 from the first inlet 11, flows from the second outlet 14 through the second capillary tube 82 to the evaporator 63, and cools the refrigerator compartments. Since the refrigerant does not pass through the anti-condensation tube 7, the temperature of the anti-condensation tube 7 is the lowest, resulting in a lower refrigerator heat load and reduced energy consumption. Furthermore, due to the lower refrigerant flow rate in the second capillary tube 82, the evaporation temperature of the refrigeration system is low, which is beneficial for maintaining the long-term freshness of low-temperature foods.

[0123] like Figure 18As shown, when the refrigerator temperature reaches the shutdown point, the compressor 61 stops running, and the electric valve 10 rotates to the fully closed state. Specifically, the electric valve 10 rotates until the guide groove 52 of the switch plate 5 is only connected to the second inlet 12, and the switch protrusion 53 covers the first outlet 13, the second outlet 14, and the third outlet 15, so that the first outlet 13, the second outlet 14, and the third outlet 15 are all disconnected from the first inlet 11. The refrigerant in the condenser 62 and the anti-condensation pipe 7 cannot flow into the low-temperature evaporator 63, reducing the energy loss of the refrigeration system during the start-up and shutdown of the compressor 61.

[0124] During the initial startup of compressor 61, the refrigeration system can only function normally after a sufficient pressure difference is established between condenser 62 and evaporator 63. However, after compressor 61 stops, the pressure difference between condenser 62 and evaporator 63 decreases, causing higher-temperature refrigerant to flow into evaporator 63, resulting in energy loss. In this embodiment, the fully closed electric valve prevents the migration of higher-temperature refrigerant to evaporator 63 during compressor 61 shutdown, thereby reducing energy loss during compressor 61 restart and improving the efficiency of the refrigeration system.

[0125] The refrigeration system provided in this embodiment utilizes an electric valve to switch between five states: first quick-freeze state, second quick-freeze state, anti-condensation tube activated, anti-condensation tube closed, and fully closed state. This not only controls the activation and deactivation of the anti-condensation tube based on ambient humidity, preventing condensation from easily forming around the refrigerator lining, but also reduces the refrigerator's heat load. Furthermore, when a large amount of food is placed in the refrigerator, the system switches to quick-freeze state to rapidly lower the compartment temperature, which is beneficial for food preservation. Additionally, the electric valve can switch to the fully closed state to achieve condenser pressure maintenance, reducing refrigerator energy consumption.

[0126] like Figure 19 As shown, this embodiment also provides a third quick-freezing state. After a large number of items are placed in the freezer compartment or when the refrigerator is in the defrosting stop phase, the freezer compartment temperature exceeds the start-up temperature by about 3°C. At this time, the electric valve 10 switches to the third quick-freezing state. The electric valve 10 rotates to the switch protrusion 53 to block the first outlet 13, thus sealing the first outlet 13. The refrigerant discharged from the condenser 62 does not pass through the anti-condensation pipe 7. In addition, the through slot 51 of the switch piece 5 rotates to the top of the third outlet 15, connecting the first inlet 11 and the third outlet 15. This allows the refrigerant discharged from the condenser 62 to enter the electric valve 10 from the first inlet 11, and then flow out from the third outlet 15. It then flows through the first capillary tube 81 and the evaporator 63 in sequence to cool the refrigerator compartment before returning to the compressor 61. Because the refrigerant flow rate in the first capillary tube 81 is relatively large, it can increase the cooling capacity of the compressor, thereby causing the refrigerator temperature to drop rapidly, which is beneficial for food preservation.

[0127] The technical solution provided in this embodiment can also flexibly switch to a third quick-freezing state to flexibly select the refrigeration mode according to the temperature of the compartment, so that the temperature of the compartment can quickly reach the target temperature. In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0128] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0129] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0130] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0131] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A refrigeration system, characterized in that, include: Compressor, condenser, evaporator, anti-condensation tube, first capillary tube, second capillary tube, and electric valve; The electric valve has a first inlet, a second inlet, a first outlet, a second outlet, and a third outlet; the flow rate of the first capillary tube is greater than the flow rate of the second capillary tube; the evaporator, compressor, and condenser are connected in series; the condenser is connected to the first inlet of the electric valve. The first outlet of the electric valve is connected to one end of the anti-condensation tube, and the second inlet of the electric valve is connected to the other end of the anti-condensation tube; the second outlet of the electric valve is connected to one end of the second capillary tube, and the other end of the second capillary tube is connected to the evaporator; the third outlet of the electric valve is connected to one end of the first capillary tube, and the other end of the first capillary tube is connected to the evaporator. The electric valve can be rotated to switch between the anti-condensation tube activated state, the anti-condensation tube closed state, the first quick-freezing state, the second quick-freezing state, and the fully closed state. When the anti-condensation pipe is in operation, the first inlet is connected to the first outlet, and the second inlet is connected to the second outlet; When the anti-condensation pipe is closed, the first outlet is closed, and the first inlet is connected to the second outlet. In the first quick-freezing state, the first inlet is connected to the first outlet, and the second inlet is connected to the third outlet; In the second quick-freezing state, the first outlet is closed; the first inlet is connected to the second and third outlets; In the fully closed state, the first exit, the second exit, and the third exit are all disconnected.

2. The refrigeration system according to claim 1, characterized in that, The electric valve includes: The valve seat has through holes that extend along the axial direction, and each through hole is connected to a refrigeration pipeline. There are five through holes, including a first inlet and a second inlet for refrigerant to flow into the electric valve, and a first outlet, a second outlet and a third outlet for refrigerant to flow out of the electric valve. The valve cover has an open end and a closed end; The open end of the valve cover is connected to the valve seat; The drive motor includes a rotor and a stator, wherein the stator is disposed on the outer side wall of the valve cover and the rotor is disposed on the inner side wall of the valve cover. The gear transmission assembly is located inside the valve cover and is connected to the rotor; A switch plate is disposed between the gear transmission assembly and the valve seat; the center of the end face of the switch plate facing the valve seat is recessed inward to form a guide groove; the switch plate has a through groove that extends through its own thickness; the switch plate is connected to the gear transmission assembly, and during rotation, the switch plate connects the inlet and outlet on the valve seat through the through groove, or connects the inlet and outlet on the valve seat through the guide groove, or closes the inlet and outlet on the valve seat.

3. The refrigeration system according to claim 2, characterized in that, The gear transmission assembly includes: The wheel frame is equipped with at least two spindles; the wheel frame is also connected to the switch plate. The sun gear is located in the middle of the wheel frame; the sun gear is fixedly connected to the rotor; Planetary gears are connected to the spindle; the planetary gears are located around the sun gear and mesh with the sun gear; the planetary gears also mesh with the gear ring on the inner wall of the valve cover.

4. The refrigeration system according to claim 3, characterized in that, Also includes: The central shaft is fixed at one end inside the valve cover and extends axially; the sun gear has a shaft hole in the middle, and the central shaft is inserted into the shaft hole. The central shaft and the sun gear are clearance-fitted.

5. The refrigeration system according to claim 4, characterized in that, Also includes: A fixing plate is installed inside the valve cover and located at the closed end; the middle of the fixing plate is provided with a shaft hole for the insertion of the central shaft.

6. The refrigeration system according to claim 5, characterized in that, Also includes: A spring is fitted onto the outside of the central shaft and pressed between the fixed plate and the sun gear.

7. The refrigeration system according to claim 3, characterized in that, The sun wheel includes: The main body extending along the axial direction; A fixing part is provided at one end of the main body and extends radially outward; the periphery of the fixing part is fixedly connected to the rotor; The outer side of the end of the main body that is away from the fixed part is provided with teeth for meshing with the planetary gear.

8. The refrigeration system according to claim 3 or 7, characterized in that, The sun gear and rotor are integrated into one structure through injection molding; the injection molding material of the rotor contains permanent magnet powder.

9. The refrigeration system according to claim 1, characterized in that, The switch piece has a switch protrusion in the middle, a guide groove in the middle of the switch protrusion, and a through groove in the switch protrusion.

10. The refrigeration system according to claim 9, characterized in that, The first inlet is located on the periphery of the switch protrusion; the second inlet is located in the area covered by the guide groove; the first outlet is located in the area covered by the rotating through groove; the second outlet is located in both the area covered by the rotating through groove and the area covered by the rotating guide groove; the third outlet is located in both the area covered by the rotating through groove and the area covered by the rotating guide groove.

11. The refrigeration system according to claim 10, characterized in that, The guide groove is a long strip structure, with one end located at the center of the switch protrusion and the other end extending away from the through groove; The switch piece can be rotated to the guide groove to simultaneously cover the second inlet and the second outlet, thus connecting them; or it can be rotated to the guide groove to simultaneously cover the second inlet and the third outlet, thus connecting them. The switch piece can be rotated to cover the first outlet with the through slot, so that the first outlet is connected to the first inlet; or rotated to cover the second outlet with the through slot, so that the second outlet is connected to the first inlet; or rotated to cover both the second outlet and the third outlet at the same time, so that the second outlet and the third outlet are connected to the first inlet.

12. The refrigeration system according to claim 11, characterized in that, The second inlet is located at the center of the switch protrusion; the central angle formed between the first inlet and the first outlet is an acute angle; the central angle formed between the first inlet and the second outlet is an obtuse angle; the central angle formed between the second outlet and the third outlet is an acute angle; and the central angle formed between the first outlet and the third outlet is an obtuse angle.

13. The refrigeration system according to claim 1, characterized in that, The length of the first capillary is less than the length of the second capillary.

14. An electric valve, characterized in that, include: The valve seat has through holes that extend along the axial direction, and each through hole is connected to a refrigeration pipeline. There are five through holes, including a first inlet and a second inlet for refrigerant to flow into the electric valve, and a first outlet, a second outlet and a third outlet for refrigerant to flow out of the electric valve. The valve cover has an open end and a closed end; The open end of the valve cover is connected to the valve seat; The drive motor includes a rotor and a stator, wherein the stator is disposed on the outer wall of the valve cover and the rotor is disposed inside the valve cover; The gear transmission assembly is located inside the valve cover and is connected to the rotor; A switch plate is disposed between the gear transmission assembly and the valve seat; the center of the end face of the switch plate facing the valve seat is recessed inward to form a guide groove; the switch plate has a through groove that extends through its own thickness; the switch plate is connected to the gear transmission assembly, and during rotation, the switch plate connects the inlet and outlet on the valve seat through the through groove, or connects the inlet and outlet on the valve seat through the guide groove, or closes the inlet and outlet on the valve seat.

15. The electric valve according to claim 14, characterized in that, The gear transmission assembly includes: The wheel frame is equipped with at least two spindles; the wheel frame is also connected to the switch plate. The sun gear is located in the middle of the wheel frame; the sun gear is fixedly connected to the rotor; Planetary gears are connected to the spindle; the planetary gears are located around the sun gear and mesh with the sun gear; the planetary gears also mesh with the gear ring on the inner wall of the valve cover.

16. The electric valve according to claim 15, characterized in that, Also includes: The central shaft is fixed at one end inside the valve cover and extends axially; the sun gear has a shaft hole in the middle, and the central shaft is inserted into the shaft hole. The central shaft and the sun gear are clearance-fitted.

17. The electric valve according to claim 16, characterized in that, Also includes: A fixing plate is installed inside the valve cover and located at the closed end; the middle of the fixing plate is provided with a shaft hole for the insertion of the central shaft.

18. The electric valve according to claim 17, characterized in that, Also includes: A spring is fitted onto the outside of the central shaft and pressed between the fixed plate and the sun gear.

19. The electric valve according to claim 15, characterized in that, The sun wheel includes: The main body extending along the axial direction; A fixing part is provided at one end of the main body and extends radially outward; the periphery of the fixing part is fixedly connected to the rotor; The outer side of the end of the main body that is away from the fixed part is provided with teeth for meshing with the planetary gear.

20. The electric valve according to claim 14, characterized in that, The switch piece has a switch protrusion in the middle, a guide groove in the middle of the switch protrusion, and a through groove in the switch protrusion.

21. The electric valve according to claim 20, characterized in that, The first inlet is located on the periphery of the switch protrusion; the second inlet is located in the area covered by the guide groove; the first outlet is located in the area covered by the rotating through groove; the second outlet is located in both the area covered by the rotating through groove and the area covered by the rotating guide groove; the third outlet is located in both the area covered by the rotating through groove and the area covered by the rotating guide groove.

22. The electric valve according to claim 21, characterized in that, The guide groove is a long strip structure, with one end located at the center of the switch protrusion and the other end extending away from the through groove; The switch piece can be rotated to the guide groove to simultaneously cover the second inlet and the second outlet, thus connecting them; or it can be rotated to the guide groove to simultaneously cover the second inlet and the third outlet, thus connecting them. The switch piece can be rotated so that the through slot covers the first outlet, so that the first outlet is connected to the first inlet; or rotated so that the through slot covers the second outlet, so that the second outlet is connected to the first inlet; or rotated so that the through slot covers both the second outlet and the third outlet, so that the second outlet and the third outlet are connected to the first inlet.

23. The electric valve according to claim 22, characterized in that, The second inlet is located at the center of the switch protrusion; the central angle formed between the first inlet and the first outlet is an acute angle; the central angle formed between the first inlet and the second outlet is an obtuse angle; the central angle formed between the second outlet and the third outlet is an acute angle; and the central angle formed between the first outlet and the third outlet is an obtuse angle.

24. A refrigerator, characterized in that, Includes the refrigeration system according to any one of claims 1-13, or the electric valve according to any one of claims 14-23.

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