Refrigeration system with dual evaporators and refrigerator

Abstract

The application provides a double-evaporator refrigeration system and refrigerator, and belongs to the technical field of refrigeration equipment. The double-evaporator refrigeration system can realize three working modes through the setting and collaborative switching of four control valves (a first control valve, a second control valve, a third control valve and a fourth control valve), namely, double-evaporator synchronous refrigeration, defrosting of a refrigeration compartment while refrigeration of a freezing compartment, and defrosting of the freezing compartment while refrigeration of the refrigeration compartment. Thus, hot gas defrosting can be performed by using high-temperature exhaust gas of a compressor, which can not only significantly reduce the energy consumption of electric defrosting, but also maintain the continuity of refrigeration operation, improve the overall energy efficiency and temperature control stability of the system, and effectively solve the problems of high energy consumption and large temperature fluctuation caused by shutdown or dependence on electric heating during defrosting of a traditional refrigerator.

Description

Technical Field

[0001] This application relates to the field of refrigeration equipment technology, and more particularly to a refrigeration system with dual evaporators and a refrigerator. Background Technology

[0002] Currently, with the improvement of living standards, refrigerators have become an indispensable part of people's daily lives, as they can store and refrigerate items and extend their shelf life.

[0003] A refrigerator consists of a cabinet and a liner inside the cabinet, which forms a freezer compartment and a refrigerator compartment. The freezer and refrigerator compartments have different temperatures to accommodate different items. The cabinet also houses a refrigeration system that cools both the freezer and refrigerator compartments. Due to the unique working principle of refrigerator refrigeration, the refrigerant absorbs heat as it evaporates in the evaporator, causing frost to form on the evaporator surface. If defrosting is not performed promptly, the frost layer on the evaporator surface will gradually thicken, reducing cooling capacity and decreasing the refrigerator's efficiency. Therefore, refrigerators require defrosting.

[0004] In related technologies, single-evaporator refrigeration systems require shutdown or electric heating for defrosting, resulting in high energy consumption and affecting storage temperatures. While dual-evaporator refrigeration systems allow independent temperature control of each compartment, defrosting still requires defrosting heating elements or shutdown for defrosting. Therefore, these technologies do not fully utilize the compressor exhaust heat for defrosting, leading to problems such as frequent defrosting cycles, high energy consumption, and incomplete defrosting. Utility Model Content

[0005] To address the aforementioned issues, this application proposes a dual-evaporator refrigeration system and refrigerator, which aims to improve system operating efficiency and achieve energy conservation and consumption reduction in the refrigerator by utilizing the high temperature of compressor exhaust for hot defrosting of the evaporator through loop design.

[0006] To achieve the above objectives, a first aspect of this application provides a dual-evaporator refrigeration system, including a compressor, a condenser, a first throttling device, a refrigeration evaporator, a second throttling device, a freezing evaporator, a first control valve, a second control valve, a third control valve, and a fourth control valve, wherein... The compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the first control valve inlet, the first control valve outlet is connected to the second control valve inlet, the second control valve outlet is connected to the first throttling device inlet, the first throttling device outlet is connected to the refrigerated evaporator inlet, the refrigerated evaporator outlet is connected to the third control valve inlet, and the third control valve outlet is connected to the compressor inlet. The second outlet of the second control valve is connected to the inlet of the second throttling device, the outlet of the second throttling device is connected to the inlet of the refrigeration evaporator, the outlet of the refrigeration evaporator is connected to the inlet of the fourth control valve, and the first outlet of the fourth control valve is connected to the inlet of the compressor. The second outlet end of the first control valve is connected between the outlet end of the first throttling device and the inlet end of the refrigeration evaporator, and the second outlet end of the third control valve is connected between the second outlet end of the second control valve and the inlet end of the second throttling device. The third outlet of the first control valve is connected between the outlet of the second throttling device and the inlet of the refrigeration evaporator, and the second outlet of the fourth control valve is connected between the first outlet of the second control valve and the inlet of the first throttling device.

[0007] The above technical solution has the following advantages or beneficial effects: In this embodiment, by setting and coordinating the switching of four control valves (first control valve, second control valve, third control valve, and fourth control valve), three operating modes can be achieved: simultaneous cooling of both evaporators, simultaneous defrosting of the refrigerator compartment and cooling of the freezer compartment, and dual-mode operation of simultaneous defrosting of the freezer compartment and cooling of the refrigerator compartment. Therefore, hot gas defrosting can be performed using the high temperature of the compressor exhaust, which not only significantly reduces the energy consumption of electric defrosting but also maintains the continuity of refrigeration operation, improves the overall energy efficiency and temperature control stability of the system, and effectively solves the problems of high energy consumption and large temperature fluctuations caused by the need to stop the refrigerator or rely on electric heating during defrosting in traditional refrigerators.

[0008] In one embodiment of this application, the refrigeration system further includes a first dryer filter, a first outlet end of the second control valve connected to the inlet end of the first dryer filter, a second outlet end of the fourth control valve connected to the inlet end of the first dryer filter, and an outlet end of the first dryer filter connected to the inlet end of the first throttling device.

[0009] The above technical solution has the following advantages or beneficial effects: In this embodiment of the application, by connecting a first drying filter between the second outlet end of the fourth control valve and the first throttling device, impurities and moisture in the refrigerant can be effectively removed, thereby achieving dual purification and flow optimization of the refrigerant in the refrigeration system on the refrigeration side.

[0010] In one embodiment of this application, the refrigeration system further includes a second dryer filter, the second outlet end of the second control valve is connected to the inlet end of the second dryer filter, and the outlet end of the second dryer filter is connected to the inlet end of the second throttling device.

[0011] The above technical solution has the following advantages or beneficial effects: In this embodiment of the application, by connecting a second drying filter between the second outlet end of the second control valve and the second throttling device, impurities and moisture in the refrigerant can be effectively removed, thereby achieving dual purification and flow optimization of the refrigerant in the refrigeration system on the freezing side.

[0012] In one embodiment of this application, the first control valve is a four-way valve, and the second, third, and fourth control valves are all three-way valves.

[0013] The above technical solution has the following advantages or beneficial effects: In this embodiment, the first control valve is a four-way valve, and the second, third, and fourth control valves are all three-way valves, which can realize precise, rapid switching and efficient control of the refrigerant path in the refrigeration system.

[0014] In one embodiment of this application, the refrigeration system further includes a liquid receiver, the first outlet end of the third control valve is connected to the inlet end of the liquid receiver, the first outlet end of the fourth control valve is connected to the inlet end of the liquid receiver, and the outlet end of the liquid receiver is connected to the inlet end of the compressor.

[0015] The above technical solution has the following advantages or beneficial effects: In this embodiment, by connecting the first outlets of both the third and fourth control valves to the inlet of the receiver, and connecting the outlet of the receiver to the compressor inlet, centralized storage and dynamic regulation of the return refrigerant in the dual evaporator system can be achieved. As a refrigerant buffer container, the receiver effectively absorbs refrigerant flow fluctuations caused by control valve switching under complex conditions of alternating defrosting in the refrigerator and freezer compartments, ensuring the stability of refrigerant supply to the compressor suction side and avoiding the risk of liquid slugging.

[0016] In one embodiment of this application, the refrigeration system includes a refrigeration circuit for refrigeration and a freezing circuit for refrigeration. The refrigeration circuit includes the compressor, the condenser, the first control valve, the second control valve, the first throttling device, the refrigeration evaporator, the third control valve, the liquid receiver, and the compressor, which are connected in sequence to form the circuit. The refrigeration circuit includes the compressor, the condenser, the first control valve, the second control valve, the second throttling device, the refrigeration evaporator, the fourth control valve, the liquid receiver, and the compressor, which are connected in sequence to form the circuit.

[0017] The above technical solution has the following advantages or beneficial effects: In this embodiment, by clearly defining the refrigeration circuit for refrigerators and the refrigeration circuit for freezers, and sharing the compressor, condenser, and front-end control valve assembly, the dual-evaporator system can achieve efficient independent operation in conventional refrigeration mode. Through the design of two independent and structurally symmetrical refrigeration circuits, it can be ensured that the refrigerator compartment and the freezer compartment can achieve precise temperature control according to their respective needs.

[0018] In one embodiment of this application, the refrigeration system further includes a refrigeration defrosting and freezing refrigeration circuit, which includes the compressor, the condenser, the first control valve, the refrigeration evaporator, the third control valve, the second throttling device, the freezing evaporator, the fourth control valve, the liquid receiver, and the compressor connected in sequence to form the circuit.

[0019] The above technical solution has the following advantages or beneficial effects: In this embodiment, the refrigerator defrosting and freezing refrigeration circuit enables simultaneous and efficient operation of the refrigerator evaporator defrosting and the freezing evaporator cooling. Specifically, the high temperature of the compressor exhaust is first used to defrost the refrigerator evaporator with hot gas. After defrosting, the refrigerant enters the freezing evaporator through the third control valve and the second throttling device to continue cooling, avoiding energy waste in the traditional defrosting process and significantly improving system energy efficiency. At the same time, the freezer compartment can maintain a cooling state during the defrosting of the refrigerator compartment, effectively reducing temperature fluctuations inside the compartment and meeting the stringent temperature requirements of special items.

[0020] In one embodiment of this application, the refrigeration system further includes a refrigeration defrosting circuit, the refrigeration defrosting circuit including the compressor, the condenser, the first control valve, the refrigeration evaporator, the fourth control valve, the first throttling device, the refrigeration evaporator, the third control valve, the liquid receiver, and the compressor connected in sequence to form the circuit.

[0021] The above technical solution has the following advantages or beneficial effects: In this embodiment, the refrigeration circuit for freezing defrosting enables simultaneous and efficient operation of the freezing evaporator defrosting and the refrigeration of the refrigerator evaporator. Specifically, the high temperature of the compressor exhaust is first used to defrost the freezing evaporator with hot gas. After defrosting, the refrigerant enters the refrigerator evaporator through the fourth control valve and the first throttling device to continue refrigeration, avoiding energy waste in the traditional defrosting process. Simultaneously, the refrigerator compartment maintains its refrigeration state during the freezing compartment defrosting, effectively reducing temperature fluctuations within the compartment and meeting the stringent temperature requirements of special items.

[0022] In one embodiment of this application, both the first throttling device and the second throttling device are capillary tubes.

[0023] The above technical solution has the following advantages or beneficial effects: In this embodiment, both the first and second throttling devices employ capillary tubes. Capillary tubes have a simple structure and no moving parts, significantly reducing leakage risk and maintenance costs, while avoiding the mechanical wear problems of traditional throttling valves. Furthermore, capillary tubes can respond quickly when switching between defrosting / cooling modes in the refrigerator and freezer compartments, ensuring system pressure balance and energy efficiency optimization.

[0024] To achieve the above objectives, a second aspect of this application provides a refrigerator, comprising: The cabinet has a spaced-out refrigerator compartment and a freezer compartment. The refrigeration system described in any embodiment of this application is used for cooling and defrosting the refrigerator compartment and the freezer compartment.

[0025] The above technical solution has the following advantages or beneficial effects: In this embodiment, the refrigerator includes the refrigeration system described in any embodiment of this application. Through the setting and coordinated switching of four control valves (first control valve, second control valve, third control valve, and fourth control valve), three operating modes can be achieved: simultaneous cooling of both evaporators, simultaneous defrosting of the refrigerator compartment and cooling of the freezer compartment, and dual-mode operation of simultaneous defrosting of the freezer compartment and cooling of the refrigerator compartment. Therefore, hot gas defrosting can be performed using the high temperature of the compressor exhaust, which not only significantly reduces the energy consumption of electric defrosting but also maintains the continuity of refrigeration operation, improves the overall energy efficiency and temperature control stability of the system, and effectively solves the problems of high energy consumption and large temperature fluctuations caused by the need to stop the refrigerator or rely on electric heating during defrosting in traditional refrigerators.

[0026] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the principles of this application.

[0028] Figure 1 This is a front view of a refrigerator according to an embodiment of this application.

[0029] Figure 2 for Figure 1 A cross-sectional view.

[0030] Figure 3 This is a first structural schematic diagram of a dual-evaporator refrigeration system provided in an embodiment of this application.

[0031] Figure 4 This is a schematic diagram of the second structure of a dual-evaporator refrigeration system provided in one embodiment of this application.

[0032] Figure 5 This is a third structural schematic diagram of a dual-evaporator refrigeration system provided in one embodiment of this application.

[0033] Figure 6 This is a schematic diagram of the refrigerant flow direction in the parallel refrigeration circuit of the freezer and refrigerator compartments provided in one embodiment of this application.

[0034] Figure 7 This is a schematic diagram of the refrigerant flow direction in a refrigeration circuit for defrosting and freezing provided in one embodiment of this application.

[0035] Figure 8 This is a schematic diagram of the refrigerant flow direction in a refrigeration circuit for defrosting and cooling provided in one embodiment of this application.

[0036] Figure label: 1. Cabinet body; 11. Refrigerator compartment; 12. Freezer compartment; 13. Cabinet door; 10. Compressor; 20. Condenser; 30. First throttling device; 40. Refrigerated evaporator; 50. Second throttling device; 60. Refrigerated evaporator; 70. First control valve; 80. Second control valve; 90. Third control valve; 100. Fourth control valve; 110. First dryer filter; 120. Second dryer filter; 130. Liquid receiver. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0038] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps described or executed may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0040] Traditional single-system refrigerators require shutdown or electric heating for defrosting, resulting in high energy consumption and affecting storage temperature. While dual-system refrigerators can independently control the temperature of each compartment, they still require defrosting heating elements or shutdown for defrosting. Current technology does not fully utilize the compressor's exhaust heat for defrosting, leading to problems such as frequent defrosting cycles, high energy consumption, and incomplete defrosting.

[0041] Based on this, this application proposes a dual-evaporator refrigeration system and refrigerator. Through loop design, the high temperature of the compressor exhaust can be used to defrost the evaporator, thereby improving system operating efficiency and achieving energy saving and consumption reduction in the refrigerator.

[0042] For ease of description, unless otherwise specified, the directions of up, down, left, right, front, and back in this article are based on the state of the refrigerator when it is in use. The refrigerator door is the front, the opposite direction is the back, and the vertical direction is the up and down direction.

[0043] Please see Figures 1 to 2 As shown, Figure 1 This is a front view of a refrigerator according to an embodiment of this application. Figure 2 for Figure 1 A cross-sectional view. The refrigerator provided in this embodiment may include a cabinet 1. The cabinet 1 may have a hollow structure such as a cuboid. The cabinet 1 forms the outer shell of the refrigerator. It should be noted that the cabinet 1 may also have a hollow shell structure of other shapes.

[0044] In some embodiments, the interior of the cabinet 1 may have a plurality of compartments, which may include a refrigerator compartment 11 and a freezer compartment 12. The refrigerator compartment 11 and the freezer compartment 12 may be configured as multiple storage compartments. The cabinet 1 may have an upper cavity and a lower cavity that are spaced apart vertically, the upper cavity being either the refrigerator compartment 11 or the freezer compartment 12, and the lower cavity being either the refrigerator compartment 11 or the freezer compartment 12.

[0045] In some embodiments, the refrigerator compartment 11 and the freezer compartment 12 can serve as independent storage spaces to meet different refrigeration needs, such as freezing and refrigeration, depending on the type of food, and to store items that require refrigeration or freezing. The refrigerator compartment 11 and the freezer compartment 12 can be arranged vertically.

[0046] In some embodiments, the refrigerator may include a refrigerator liner. A refrigerator compartment 11 and a freezer compartment 12 may be formed within the refrigerator liner.

[0047] Please see Figure 1 As shown, in some embodiments, the refrigerator may include a door 13. The door 13 may be hinged to the front side of the body 1 for opening and closing the refrigerator compartment 11 and the freezer compartment 12.

[0048] It should be noted that multiple doors 13 can be provided. Each door 13 can be provided in a one-to-one correspondence with a refrigerator compartment 11 and a freezer compartment 12. One refrigerator compartment 11 can be provided with one or more doors 13, and one freezer compartment can also be provided with one or more doors 13.

[0049] In some embodiments, a compressor compartment may be provided inside the housing 1. A compressor may be installed inside the compressor compartment. The compressor compartment may be located in the bottom area of ​​the housing 1. The compressor compartment may be located below the rear side of the freezer compartment 12. The compressor, condenser, throttling device, etc., may be installed inside the housing 1.

[0050] In some embodiments, the refrigerator may include a refrigeration system. The refrigeration system may be located inside the refrigerator body 1. The refrigeration system provides cold air to the interior of the refrigerator to maintain a low-temperature environment in each of the refrigerator compartments 11 and the freezer compartment 12. A refrigeration system is a system that uses refrigerant circulation to lower the temperature, and mainly includes major components such as a compressor, condenser, throttling element, and evaporator. The refrigeration system achieves a cooling effect by circulating refrigerant to transfer heat from a low-temperature object to a high-temperature object.

[0051] Reference Figure 3 , Figure 3 This is a first structural schematic diagram of a dual-evaporator refrigeration system provided in an embodiment of this application. The embodiment of this application provides a dual-evaporator refrigeration system, including a compressor 10, a condenser 20, a first throttling device 30, a refrigerated evaporator 40, a second throttling device 50, a refrigerated evaporator 60, a first control valve 70, a second control valve 80, a third control valve 90, and a fourth control valve 100.

[0052] The compressor 10 is connected to the condenser 20, the condenser 20 is connected to the first control valve 70, the first control valve 70 is connected to the second control valve 80, the second control valve 80 is connected to the first throttling device 30, the first throttling device 30 is connected to the refrigerated evaporator 40, the refrigerated evaporator 40 is connected to the third control valve 90, and the third control valve 90 is connected to the compressor 10.

[0053] The second outlet of the second control valve 80 is connected to the inlet of the second throttling device 50, the outlet of the second throttling device 50 is connected to the inlet of the refrigeration evaporator 60, the outlet of the refrigeration evaporator 60 is connected to the inlet of the fourth control valve 100, and the first outlet of the fourth control valve 100 is connected to the inlet of the compressor 10.

[0054] The second outlet of the first control valve 70 is connected between the outlet of the first throttling device 30 and the inlet of the refrigerated evaporator 40, and the second outlet of the third control valve 90 is connected between the second outlet of the second control valve 80 and the inlet of the second throttling device 50. The third outlet of the first control valve 70 is connected between the outlet of the second throttling device 50 and the inlet of the refrigeration evaporator 60, and the second outlet of the fourth control valve 100 is connected between the first outlet of the second control valve 80 and the inlet of the first throttling device 30.

[0055] The compressor 10 serves as the system's power source, compressing the refrigerant and delivering it to the condenser 20. The condenser 20 cools the high-temperature, high-pressure gaseous refrigerant into a liquid state, outputting it to the first control valve 70. The first control valve 70 can be a four-way valve, allowing for switching the refrigerant flow direction according to the operating mode. The second control valve 80 can be a three-way valve, distributing refrigerant to either the refrigeration evaporator 40 or the freezing evaporator 60. The third control valve 90 and the fourth control valve 100 work together to control the return gas path of the refrigeration / freezing evaporator. The first throttling device 30 (refrigeration side) and the second throttling device 50 (freezing side) are used to reduce refrigerant pressure and throttle the flow. The refrigeration evaporator 40 and the freezing evaporator 60 can operate independently, switching between cooling and defrosting functions via valve group switching.

[0056] In this embodiment, by controlling the switching of the valve group, the high temperature of the compressor exhaust can be used to perform hot gas defrosting on the evaporators (including the refrigeration evaporator and the freezing evaporator), avoiding the energy waste of traditional electric heating defrosting. During the defrosting process, the high-temperature refrigerant can be recovered and reused by another evaporator, achieving dual energy utilization and improving system energy efficiency. The refrigerator compartment and the freezer compartment are controlled independently, and the other side can still maintain cooling during defrosting, avoiding temperature fluctuations inside the cabinet and ensuring the quality of stored items.

[0057] In some embodiments, both the first throttling device 30 and the second throttling device 50 may be capillary tubes. Capillary tubes have a simple structure and no moving parts, which can significantly reduce leakage risk and maintenance costs, while avoiding the mechanical wear problems of traditional throttling valves. Furthermore, capillary tubes can respond quickly when switching between defrosting / cooling modes in the refrigerator and freezer compartments, ensuring system pressure balance and energy efficiency optimization.

[0058] In some embodiments, the first control valve 70 is a four-way valve, while the second control valve 80, third control valve 90, and fourth control valve 100 are all three-way valves. By designing the first control valve 70 as a four-way valve and the second control valve 80, third control valve 90, and fourth control valve 100 as three-way valves, flexible switching and efficient control of the refrigeration system flow path can be achieved. The introduction of the four-way valve allows the system to manage the refrigerant flow direction more precisely, especially in defrosting mode. It can efficiently utilize the heat from the compressor exhaust to defrost the evaporator while ensuring that the other evaporator continues to cool, thereby significantly improving energy efficiency and maintaining a stable internal temperature. The use of three-way valves simplifies local flow path control and reduces system complexity and cost. This valve combination scheme, while ensuring system reliability, effectively solves the problems of large temperature fluctuations and high energy consumption during defrosting in traditional refrigerators by optimizing refrigerant path switching, achieving efficient collaborative operation of the dual evaporator system.

[0059] In some embodiments, the first control valve 70, the second control valve 80, the third control valve 90, and the fourth control valve 100 may all be solenoid valves. Solenoid valves offer fast response and excellent sealing, enabling them to precisely execute the switching commands between the defrosting / cooling modes of the refrigerator and freezer compartments, ensuring a strict match between the refrigerant flow direction and the system's operating mode. Simultaneously, the electromagnetic drive simplifies the mechanical transmission structure, improves valve assembly reliability, and avoids leakage or jamming problems caused by wear in traditional mechanical valves, thereby ensuring the stability of the hot gas defrosting process and the continuity of refrigeration efficiency.

[0060] Reference Figure 4 , Figure 4 This is a schematic diagram of the second structure of a dual-evaporator refrigeration system provided in one embodiment of this application. Figure 4 The refrigeration system shown is a dual-evaporator system. Figure 3 Based on the dual-evaporator refrigeration system shown, a first dryer filter 110 and a second dryer filter 120 are added.

[0061] The first outlet of the second control valve 80 is connected to the inlet of the first dryer filter 110, the second outlet of the fourth control valve 100 is connected to the inlet of the first dryer filter 110, and the outlet of the first dryer filter 110 is connected to the inlet of the first throttling device 30.

[0062] The second outlet of the second control valve 80 is connected to the inlet of the second dryer filter 120, and the outlet of the second dryer filter 120 is connected to the inlet of the second throttling device 50.

[0063] In this embodiment, by configuring independent dryer filters (first dryer filter 110 and second dryer filter 120) for the refrigeration circuit and the freezing circuit respectively, dual purification and precise control of the refrigerant can be achieved. Specifically, the first dryer filter 110 can simultaneously process the refrigerant from the second control valve 80 and the fourth control valve 100, effectively intercepting impurities such as metal shavings and oxide scale in the refrigeration circuit, and absorbing moisture to prevent ice blockage or capillary tube blockage. The second dryer filter 120 independently processes the refrigerant in the freezing circuit, ensuring the purity of the refrigerant in the freezing evaporator 60.

[0064] The dual-dryer filter design avoids cross-contamination between the refrigeration and freezing circuits, reducing the risk of system failure due to impurities or moisture, and minimizing the possibility of compressor overload damage. By keeping the refrigerant clean, the dryer filter ensures the efficiency of the throttling devices (first throttling device 30 and second throttling device 50), thereby maintaining the system's high-efficiency operation.

[0065] Reference Figure 5 , Figure 5 This is a third structural schematic diagram of a dual-evaporator refrigeration system provided in one embodiment of this application. Figure 5 The refrigeration system shown is a dual-evaporator system. Figure 4 Based on the dual-evaporator refrigeration system shown, a liquid receiver 130 has been added.

[0066] The first outlet of the third control valve 90 is connected to the inlet of the liquid reservoir 130, the first outlet of the fourth control valve 100 is connected to the inlet of the liquid reservoir 130, and the outlet of the liquid reservoir 130 is connected to the inlet of the compressor 10.

[0067] In this embodiment, by adding a liquid receiver 130 and connecting the first outlet ends of both the third control valve 90 and the fourth control valve 100 to the inlet end of the liquid receiver 130, centralized storage and dynamic adjustment of the return gas refrigerant in the dual evaporator system can be achieved. The liquid receiver 130, acting as a refrigerant "reservoir," effectively absorbs refrigerant flow fluctuations caused by evaporator defrosting / cooling mode switching, ensuring the stability of refrigerant supply on the suction side of the compressor 10 and avoiding the risk of liquid slugging. Simultaneously, the liquid receiver 130, through its gas-liquid separation function, can intercept any liquid refrigerant that may be entrained in the return gas, further improving the compressor's operational reliability. Furthermore, the liquid receiver 130 can automatically adjust the refrigerant circulation volume according to system load changes, balancing the system's refrigerant demand when ambient temperature fluctuates, and ensuring the continuity of cooling efficiency.

[0068] Reference Figure 6 , Figure 6This is a schematic diagram of the refrigerant flow in a parallel refrigeration circuit for the freezer and refrigerator compartments provided in an embodiment of this application. Through the coordinated control of the first control valve 70, the second control valve 80, the third control valve 90, and the fourth control valve 100, the following can be achieved: Figure 6 The refrigeration circuit for refrigeration and the refrigeration circuit for freezing are shown.

[0069] The refrigeration circuit includes a compressor 10, a condenser 20, a first control valve 70, a second control valve 80, a first dryer filter 110, a first throttling device 50, a refrigeration evaporator 40, a third control valve 90, a liquid receiver 130, and the compressor 10 connected in sequence to form the circuit.

[0070] The refrigeration circuit includes a compressor 10, a condenser 20, a first control valve 70, a second control valve 80, a second dryer filter 120, a second throttling device 50, a refrigeration evaporator 60, a fourth control valve 100, a liquid receiver 130, and the compressor 10 connected in sequence to form the circuit.

[0071] In this embodiment, by designing independent parallel refrigeration circuits for the refrigerator and freezer compartments and equipping them with dedicated drying filters (first drying filter 110 and second drying filter 120), efficient and precise control of the dual evaporator system can be achieved. The independent circuit design ensures that the refrigerator and freezer compartments can operate independently according to their respective needs without interference, thereby improving the accuracy and stability of temperature control. The corresponding drying filters purify the refrigerant in the refrigerator and freezer circuits respectively, effectively preventing impurities and moisture from entering the system, protecting critical components (such as throttling devices and compressors), and extending equipment lifespan. Simultaneously, the configuration of the receiver 130 further buffers refrigerant flow fluctuations, ensuring the stability of the compressor's suction side. This design not only optimizes refrigeration efficiency but also significantly improves system reliability and energy efficiency, making it particularly suitable for applications with high temperature control requirements.

[0072] Reference Figure 7 , Figure 7 This is a schematic diagram of the refrigerant flow in a refrigeration circuit for defrosting and freezing provided in one embodiment of this application. Through the coordinated control of the first control valve 70, the second control valve 80, the third control valve 90, and the fourth control valve 100, the following can be achieved: Figure 7 The refrigeration circuit shown is for refrigeration and defrosting.

[0073] The refrigeration circuit for defrosting includes a compressor 10, a condenser 20, a first control valve 70, a refrigeration evaporator 40, a third control valve 90, a second dryer filter 120, a second throttling device 50, a refrigeration evaporator 60, a fourth control valve 100, a liquid receiver 130, and the compressor 10 connected in sequence to form the circuit.

[0074] In this embodiment, the refrigeration circuit for defrosting the refrigerator evaporator and cooling the freezer evaporator can be constructed through valve group coordinated control, enabling synchronous and efficient operation of the refrigerator evaporator defrosting and the freezer evaporator cooling. The refrigerator defrosting circuit utilizes the high temperature of the compressor 10 exhaust gas to defrost the refrigerator evaporator 40. After defrosting, the refrigerant enters the freezer evaporator 60 via the third control valve 90, the second dryer filter 120, and the second throttling device 50 to continue cooling, avoiding energy waste in the traditional defrosting process and significantly improving system energy efficiency. Simultaneously, the freezer compartment maintains a cooling state during the defrosting of the refrigerator compartment, effectively reducing temperature fluctuations within the compartment and meeting the stringent temperature requirements of special items. The purification of the defrosting refrigerant by the second dryer filter 120 further protects the second throttling device 50 and the freezer evaporator 60, ensuring long-term reliable operation of the system under complex conditions.

[0075] Reference Figure 8 , Figure 8 This is a schematic diagram of the refrigerant flow in a refrigeration circuit for defrosting and cooling provided in an embodiment of this application. Through the coordinated control of the first control valve 70, the second control valve 80, the third control valve 90, and the fourth control valve 100, the following can be achieved: Figure 8 The refrigeration circuit shown is for freezing and defrosting.

[0076] The refrigeration circuit for defrosting includes a compressor 10, a condenser 20, a first control valve 70, a refrigeration evaporator 60, a fourth control valve 100, a first dryer filter 110, a first throttling device 30, a refrigeration evaporator 40, a third control valve 90, a liquid receiver 130, and the compressor 10, which are connected in sequence to form the circuit.

[0077] In this embodiment, the refrigeration circuit for freezing and defrosting, constructed through coordinated valve group control, enables simultaneous and efficient operation of the freezing evaporator defrosting and the refrigeration evaporator cooling. This refrigeration circuit utilizes the high-temperature exhaust gas from the compressor 10 to defrost the freezing evaporator 60. The defrosted refrigerant then passes through the fourth control valve 100, the first dryer filter 110, and the first throttling device 30 before entering the refrigeration evaporator 40 for continued cooling. This avoids energy waste in traditional defrosting processes and significantly improves system energy efficiency. Simultaneously, the refrigerator compartment maintains cooling during the freezing compartment's defrosting process, effectively reducing temperature fluctuations within the compartment and meeting the stringent temperature requirements of special items. The purification of the defrosting refrigerant through the first dryer filter 110 further protects the first throttling device 30 and the evaporator 40, ensuring long-term reliable operation of the system under complex conditions.

[0078] In some embodiments, Figure 1The refrigerator shown also includes a controller, which is located inside the cabinet 1. The controller can be connected to the first control valve 70, the second control valve 80, the third control valve 90, and the fourth control valve 100 respectively, so that the controller can coordinately control the valve group (first control valve 70, second control valve 80, third control valve 90, and fourth control valve 100) to enable the dual-evaporator refrigeration system to construct a refrigeration circuit for refrigeration, a freezing circuit for refrigeration, a defrost circuit for refrigeration, and a defrost circuit for refrigeration for refrigeration, and realize the switching control between different circuits.

[0079] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0080] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0081] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0082] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0083] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0084] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A refrigeration system with dual evaporators, characterized in that, It includes a compressor, a condenser, a first throttling device, a refrigerated evaporator, a second throttling device, a refrigerated evaporator, a first control valve, a second control valve, a third control valve, and a fourth control valve, wherein... The compressor outlet is connected to the condenser inlet, the condenser outlet is connected to the first control valve inlet, the first control valve outlet is connected to the second control valve inlet, the second control valve outlet is connected to the first throttling device inlet, the first throttling device outlet is connected to the refrigerated evaporator inlet, the refrigerated evaporator outlet is connected to the third control valve inlet, and the third control valve outlet is connected to the compressor inlet. The second outlet of the second control valve is connected to the inlet of the second throttling device, the outlet of the second throttling device is connected to the inlet of the refrigeration evaporator, the outlet of the refrigeration evaporator is connected to the inlet of the fourth control valve, and the first outlet of the fourth control valve is connected to the inlet of the compressor. The second outlet end of the first control valve is connected between the outlet end of the first throttling device and the inlet end of the refrigeration evaporator, and the second outlet end of the third control valve is connected between the second outlet end of the second control valve and the inlet end of the second throttling device. The third outlet of the first control valve is connected between the outlet of the second throttling device and the inlet of the refrigeration evaporator, and the second outlet of the fourth control valve is connected between the first outlet of the second control valve and the inlet of the first throttling device.

2. The refrigeration system according to claim 1, characterized in that, The refrigeration system further includes a first dryer filter, the first outlet end of the second control valve is connected to the inlet end of the first dryer filter, the second outlet end of the fourth control valve is connected to the inlet end of the first dryer filter, and the outlet end of the first dryer filter is connected to the inlet end of the first throttling device.

3. The refrigeration system according to claim 1 or 2, characterized in that, The refrigeration system further includes a second dryer filter, the second outlet end of the second control valve is connected to the inlet end of the second dryer filter, and the outlet end of the second dryer filter is connected to the inlet end of the second throttling device.

4. The refrigeration system according to claim 1, characterized in that, The first control valve is a four-way valve, and the second, third, and fourth control valves are all three-way valves.

5. The refrigeration system according to claim 1, characterized in that, The refrigeration system also includes a liquid receiver, the first outlet end of the third control valve is connected to the inlet end of the liquid receiver, the first outlet end of the fourth control valve is connected to the inlet end of the liquid receiver, and the outlet end of the liquid receiver is connected to the inlet end of the compressor.

6. The refrigeration system according to claim 5, characterized in that, The refrigeration system includes a refrigeration circuit for refrigeration and a freezing circuit for refrigeration. The refrigeration circuit includes the compressor, the condenser, the first control valve, the second control valve, the first throttling device, the refrigeration evaporator, the third control valve, the liquid receiver, and the compressor, which are connected in sequence to form the circuit. The refrigeration circuit includes the compressor, the condenser, the first control valve, the second control valve, the second throttling device, the refrigeration evaporator, the fourth control valve, the liquid receiver, and the compressor, which are connected in sequence to form the circuit.

7. The refrigeration system according to claim 5 or 6, characterized in that, The refrigeration system further includes a refrigeration defrosting and freezing refrigeration circuit, which includes the compressor, the condenser, the first control valve, the refrigeration evaporator, the third control valve, the second throttling device, the freezing evaporator, the fourth control valve, the liquid receiver, and the compressor connected in sequence to form the circuit.

8. The refrigeration system according to claim 7, characterized in that, The refrigeration system further includes a refrigeration defrosting circuit, which includes the compressor, the condenser, the first control valve, the refrigeration evaporator, the fourth control valve, the first throttling device, the refrigeration evaporator, the third control valve, the liquid receiver, and the compressor connected in sequence to form the circuit.

9. The refrigeration system according to claim 1, characterized in that, Both the first throttling device and the second throttling device use capillary tubes.

10. A refrigerator, characterized in that, include: The cabinet has a spaced-out refrigerator compartment and a freezer compartment. The refrigeration system according to any one of claims 1-9, the refrigeration system being used for refrigerating and defrosting the refrigerator compartment and the freezer compartment.

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