Refrigerator and defrosting control method thereof

Abstract

The invention discloses a refrigerator and a defrosting control method thereof, the refrigerator comprises a refrigerator body, a refrigerating system and a controller, the refrigerating system comprises a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first electromagnetic valve and a second electromagnetic valve; the controller is configured to control a high-temperature refrigerant discharged by the compressor to flow to a target condenser corresponding to the evaporator to be defrosted through the first electromagnetic valve when the refrigerator is defrosted, and heat of the high-temperature refrigerant is used for carrying out heat exchange defrosting on the evaporator to be defrosted; the refrigerant subjected to heat exchange flows to the main condenser to be condensed, and the condensed refrigerant flows to the evaporator to be refrigerated through the second electromagnetic valve to refrigerate the chamber to be refrigerated. The evaporator is defrosted by utilizing the heat of the high-temperature refrigerant exhausted by the compressor of the refrigerator, extra electric energy does not need to be consumed, and the power consumption of the refrigerator is remarkably reduced. And meanwhile, the defrosting temperature is low and stable by using the condensation heat to quantify the frost, and the temperature in the box cannot be influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator and a defrosting control method thereof. Background Art

[0002] Existing air-cooled frost-free refrigerators all use electric heaters to defrost the evaporator. Usually, the heaters are arranged at the lower part of the evaporator. When working, the heat of the heaters is used to defrost the evaporator through heat conduction and heat radiation. In order to ensure the defrosting effect, the voltage of the defrosting heater is usually 220V, which may cause risks of electric shock and spontaneous combustion and explosion of the refrigerator. The defrosting temperature of the electric heater can usually reach up to 200 - 300 °C at most, which has a great impact on the temperature inside the refrigerator and affects the refrigeration effect of the refrigerator. At the same time, the defrosting of the electric heater will consume additional electric energy and increase the energy consumption during use. Generally, the power consumption increment caused by defrosting in air-cooled refrigerators accounts for about 13% of the total energy consumption of the whole machine. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a refrigerator and a defrosting control method thereof, which utilize the heat of the high-temperature refrigerant discharged by the refrigerator compressor to defrost the evaporator, without consuming additional electric energy, and can significantly reduce the power consumption of the refrigerator. At the same time, using the condensation heat for defrosting, the defrosting temperature is low and stable, and it will not affect the temperature inside the cabinet.

[0004] The refrigerator provided in the first embodiment of the present invention includes:

[0005] A cabinet, which serves as a support structure of the refrigerator and is internally provided with several compartments;

[0006] A refrigeration system, which is arranged in the cabinet and includes a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first solenoid valve and a second solenoid valve;

[0007] The first condenser is arranged on the side of the first evaporator, and both the first condenser and the first evaporator are arranged in the first compartment;

[0008] The second condenser is arranged on the side of the second evaporator, and both the second condenser and the second evaporator are arranged in the second compartment;

[0009] The controller is configured to, when the refrigerator defrosts, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and use the heat of the high-temperature refrigerant to perform heat exchange defrosting on the evaporator to be defrosted; the refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator.

[0010] In the refrigerator provided by the second embodiment of the present invention, the controller is further configured to:

[0011] When the evaporator to be defrosted is the first evaporator, the target condenser is the first condenser, and the evaporator to be refrigerated is the second evaporator;

[0012] When the evaporator to be defrosted is the second evaporator, the target condenser is the second condenser, and the evaporator to be refrigerated is the first evaporator.

[0013] In the refrigerator provided by the third embodiment of the present invention, the controller is further configured to:

[0014] When the refrigerator refrigerates, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the first evaporator and the second evaporator respectively to refrigerate the first compartment and the second compartment.

[0015] In the refrigerator provided by the fourth embodiment of the present invention, the refrigeration system further includes a first decompression pipe and a second decompression pipe;

[0016] The input end of the first decompression pipe is connected to the second solenoid valve, and the output end of the first decompression pipe is connected to the first evaporator; the condensed refrigerant flows through the second solenoid valve and the first decompression pipe to the first evaporator to refrigerate the first compartment;

[0017] The input end of the second decompression pipe is connected to the second solenoid valve, and the output end of the second decompression pipe is connected to the second evaporator; the condensed refrigerant flows through the second solenoid valve and the second decompression pipe to the second evaporator to refrigerate the second compartment.

[0018] In the refrigerator provided by the fifth embodiment of the present invention, the refrigeration system further includes a suction pipe, the suction pipe is respectively connected to the first evaporator and the second evaporator, and the refrigerant in the first evaporator and / or the second evaporator flows back to the compressor through the suction pipe.

[0019] The defrost control method for a refrigerator provided in the sixth embodiment of the present invention is applied to a refrigerator including a cabinet and a refrigeration system; wherein, several compartments are provided inside the cabinet; the refrigeration system includes a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first solenoid valve, and a second solenoid valve; the first condenser is provided on the side of the first evaporator, and both the first condenser and the first evaporator are provided in the first compartment; the second condenser is provided on the side of the second evaporator, and both the second condenser and the second evaporator are provided in the second compartment. The defrost control method for the refrigerator includes:

[0020] When the refrigerator is defrosting, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and use the heat of the high-temperature refrigerant to exchange heat and defrost the evaporator to be defrosted;

[0021] The refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator.

[0022] In the defrost control method for a refrigerator provided in the seventh embodiment of the present invention, the method further includes:

[0023] When the evaporator to be defrosted is the first evaporator, the target condenser is the first condenser, and the evaporator to be refrigerated is the second evaporator;

[0024] When the evaporator to be defrosted is the second evaporator, the target condenser is the second condenser, and the evaporator to be refrigerated is the first evaporator.

[0025] In the defrost control method for a refrigerator provided in the eighth embodiment of the present invention, the method further includes:

[0026] When the refrigerator is refrigerating, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the first evaporator and the second evaporator respectively to refrigerate the first compartment and the second compartment.

[0027] In the defrost control method of the refrigerator provided by the ninth embodiment of the present invention, the refrigeration system further includes a first decompression pipe and a second decompression pipe;

[0028] The input end of the first decompression pipe is connected to the second solenoid valve, and the output end of the first decompression pipe is connected to the first evaporator; the condensed refrigerant flows through the second solenoid valve and the first decompression pipe to the first evaporator to refrigerate the first compartment;

[0029] The input end of the second decompression pipe is connected to the second solenoid valve, and the output end of the second decompression pipe is connected to the second evaporator; the condensed refrigerant flows through the second solenoid valve and the second decompression pipe to the second evaporator to refrigerate the second compartment.

[0030] In the defrost control method of the refrigerator provided by the tenth embodiment of the present invention, the refrigeration system further includes a return air pipe, the return air pipe is respectively connected to the first evaporator and the second evaporator, and the refrigerant in the first evaporator and / or the second evaporator flows back to the compressor through the return air pipe.

[0031] Compared with the prior art, the beneficial effects of a refrigerator and its defrost control method provided by the embodiments of the present invention are as follows: By evenly arranging the condensation pipes on the evaporator, when the refrigerator defrosts, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and use the heat of the high-temperature refrigerant to exchange heat and defrost the evaporator to be defrosted; the refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator. The embodiments of the present invention use the heat of the high-temperature refrigerant discharged from the refrigerator compressor to defrost the evaporator, without consuming additional electric energy, and can significantly reduce the power consumption of the refrigerator. At the same time, using the condensation heat for defrosting, the defrosting temperature is low and stable, and it will not affect the temperature inside the box. In addition, since the condensation pipes are evenly distributed on the evaporator, the defrosting is more uniform, the defrosting time is shorter, and the defrosting efficiency is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a refrigerator provided by an embodiment of the present invention;

[0033] Figure 2 is a schematic structural diagram of the box body of a refrigerator provided by an embodiment of the present invention;

[0034] Figure 3It is a schematic structural diagram of a dual-refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0035] Figure 4 It is a schematic structural diagram of a traditional evaporator;

[0036] Figure 5 It is a schematic structural diagram of an evaporator of a refrigerator provided by an embodiment of the present invention;

[0037] Figure 6 It is a schematic structural diagram of a refrigeration system of a refrigerator provided by an embodiment of the present invention;

[0038] Figure 7 It is a schematic diagram of the refrigerant flow direction when the refrigerator defrosts provided by an embodiment of the present invention;

[0039] Figure 8 It is a schematic diagram of the refrigerant flow direction when the refrigerator defrosts provided by another embodiment of the present invention;

[0040] Figure 9 It is a schematic diagram of the refrigerant flow direction when the refrigerator refrigerates provided by an embodiment of the present invention;

[0041] Figure 10 It is a schematic flowchart of a defrost control method of a refrigerator provided by an embodiment of the present invention. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0044] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0045] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0046] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a refrigerator provided by an embodiment of the present invention. The refrigerator provided by the embodiment of the present invention includes:

[0047] A cabinet 10, which serves as the support structure of the refrigerator and is internally provided with a plurality of compartments;

[0048] A refrigeration system 20, which is arranged in the cabinet and includes a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first solenoid valve, and a second solenoid valve;

[0049] The first condenser is arranged on the side of the first evaporator, and both the first condenser and the first evaporator are arranged in the first compartment;

[0050] The second condenser is arranged on the side of the second evaporator, and both the second condenser and the second evaporator are arranged in the second compartment;

[0051] The controller 30 is configured to, when the refrigerator defrosts, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and use the heat of the high-temperature refrigerant to perform heat exchange defrosting on the evaporator to be defrosted; the refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator.

[0052] Specifically, a refrigerator provided by an embodiment of the present invention includes a cabinet 10, a refrigeration system 20, and a controller 30. Please refer to Figure 2 , Figure 2It is a structural schematic diagram of a refrigerator body provided by an embodiment of the present invention. The refrigerator in this embodiment has an approximately rectangular shape, and the refrigerator includes a body 10 that defines a storage space. The body 10 serves as a supporting structure of the refrigerator, and is provided with a chamber inside, wherein the chamber includes a component storage cavity for placing components in the refrigerator, such as a compressor, etc., and also includes a storage space for storing food, etc. The storage space can be divided into a plurality of storage rooms (i.e., compartments), and the storage rooms can be configured as a refrigeration room, a freezing room, and a temperature-changing room (also called a fresh-keeping room) according to different uses. One or more door bodies 200 are provided at the opening of each storage room, for example, Figure 2 The upper storage room is a cold storage room, which is provided with a double-opening door body. The door body 200 includes a door body outer shell 210 located outside the box body 10, a door body inner liner 220 located inside the box body 10, an upper end cover 230, a lower end cover 240, and an insulation layer located between the door body outer shell 210, the door body inner liner 220, the upper end cover 230, and the lower end cover 240; usually, the insulation layer is filled with foam material. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to achieve drawer-like storage.

[0053] The refrigerator performs refrigeration operation through the refrigeration system, providing cold energy to be transferred to the compartment to keep the compartment at a constant low temperature state. The working structure of the refrigeration system includes compression process, condensation process, throttling process and evaporation process.

[0054] The compression process is as follows: plug in the refrigerator power cord, and when the box needs to cool, the compressor starts to work, and the low-temperature, low-pressure refrigerant is sucked into the compressor, compressed into high-temperature, high-pressure superheated gas in the compressor cylinder, and then discharged to the condenser;

[0055] The condensation process is as follows: the high-temperature, high-pressure refrigerant gas dissipates heat through the condenser, the temperature continues to drop, and is gradually cooled to a saturated vapor at room temperature and high pressure, and further cooled to a saturated liquid, the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process;

[0056] The throttling process is as follows: the condensed refrigerant saturated liquid is filtered through a drying filter to remove moisture and impurities, and then flows into a pressure reducing pipe, i.e., a capillary tube, through which throttling and pressure reduction are performed, and the refrigerant becomes wet steam at room temperature and low pressure;

[0057] The evaporation process is as follows: it then begins to absorb heat and vaporize in the evaporator, which not only reduces the temperature of the evaporator and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator passes through the gas-liquid separator and returns to the compressor again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thus achieving the purpose of refrigeration.

[0058] The fan allows air to continuously enter the fins of the evaporator for heat exchange, and at the same time sends the air that has become cold after the evaporator releases heat to the refrigerator compartment through the air duct. In this way, the air in the compartment circulates continuously, achieving the purpose of reducing the temperature.

[0059] Please refer to Figure 3 , Figure 3 Figure 6 is a schematic structural diagram of a dual-refrigeration system of a refrigerator provided by an embodiment of the present invention. The dual-refrigeration system of the refrigerator includes a compressor 21 that compresses the refrigerant, a first capillary tube 14a and a second capillary tube 14b that decompress the refrigerant, a refrigerating evaporator 15a and a freezing evaporator 15b that serve as heat-absorbing mechanisms, a three-way valve 17 that controls the refrigerant flow path, a check valve 18 that prevents the refrigerant from flowing backward, a dryer 19 that removes moisture in the freezing cycle, and a refrigerant confluence port 13 that connects the refrigerant flow path. They are connected through a pipe 20 to circulate the refrigerant and form a freezing cycle. In this process, the fans 12a and 12b provided for each storage compartment are used to accelerate the air flow rate, thereby accelerating the heat absorption speed of the refrigerating evaporator and the freezing evaporator and improving the refrigeration speed of the storage compartment. Among them, the three-way valve 17 has a first outlet 17a and a second outlet 17b. When the three-way valve 17 is controlled to make the first outlet 17a conduct, the refrigerant flows in sequence through the first capillary tube 14a, the refrigerating evaporator 15a, the gas-liquid separator 16a, the refrigerant confluence port 13, and then returns to the compressor 21. After passing through the first capillary tube 14a, the low-pressure and low-temperature refrigerant flows in the refrigerating evaporator 15a, exchanges heat with the air in the refrigerating evaporator 15a and the refrigerator compartment 110, and refrigerates the refrigerator compartment 110. Similarly, when the three-way valve 17 is controlled to make the second outlet 17b conduct, the refrigerant flows in sequence through the second capillary tube 14b, the freezing evaporator 15b, the gas-liquid separator 16a, the refrigerant confluence port 13, and then returns to the compressor 21. After passing through the second capillary tube 14b, the low-pressure and low-temperature refrigerant flows in the freezing evaporator 15b, exchanges heat with the air in the freezing evaporator 15b and the freezer compartment 120, and refrigerates the freezer compartment 120.

[0060] Please refer to Figure 4 , Figure 4 Figure 7 is a schematic structural diagram of a traditional evaporator. Existing frost-free refrigerators with air cooling all use electric heaters to defrost the evaporator. Usually, the heaters are arranged at the lower part of the evaporator, and when working, the heat of the heaters realizes defrosting of the evaporator through heat conduction and heat radiation. Please refer to Figure 5 , Figure 5 Figure 8 is a schematic structural diagram of an evaporator of a refrigerator provided by an embodiment of the present invention. In the embodiment of the present invention, condensers are evenly arranged on the side of the evaporator, and the solenoid valve is used to control the flow direction of the refrigerant to realize the control of refrigeration and defrosting of the evaporator. Specifically, the defrosting control method provided by the embodiment of the present invention is applied to a multi-system refrigerator. Please refer to Figure 6 ,Figure 6 Figure 6 is a schematic structural diagram of a refrigeration system of a refrigerator provided by an embodiment of the present invention. The refrigeration system includes a compressor 201, a main condenser 202, a first condenser 203, a second condenser 204, a first evaporator 205, a second evaporator 206, a first solenoid valve 207, and a second solenoid valve 208. Among them, the first condenser is arranged on the side of the first evaporator, and both the first condenser and the first evaporator are arranged in the first compartment. The second condenser is arranged on the side of the second evaporator, and both the second condenser and the second evaporator are arranged in the second compartment.

[0061] Please refer to Figure 7 , Figure 7 Figure 7 is a schematic diagram of the refrigerant flow direction during defrosting of a refrigerator provided by an embodiment of the present invention. When the refrigerator is defrosting, it is controlled that the high-temperature refrigerant discharged from the compressor 201 flows through the first solenoid valve 207 to the target condenser corresponding to the evaporator to be defrosted, and the heat of the high-temperature refrigerant is used to exchange heat and defrost the evaporator to be defrosted. The refrigerant after heat exchange flows to the main condenser 202 to continue condensation to ensure sufficient condensation and improve the system efficiency. The condensed refrigerant flows through the second solenoid valve 208 to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated, realizing uninterrupted refrigeration of the compartment to be refrigerated. Among them, the evaporator to be defrosted is the first evaporator 205 or the second evaporator 206; the target condenser is the first condenser 203 or the second condenser 204; the evaporator to be refrigerated is the second evaporator 206 or the first evaporator 205.

[0062] In the embodiment of the present invention, the heat of the high-temperature refrigerant discharged from the refrigerator compressor is used to defrost the evaporator, without consuming additional electric energy, which can significantly reduce the power consumption of the refrigerator. During the defrosting process, the compressor does not need to stop, which does not affect the normal operation of the refrigerator. While defrosting one compartment, it can ensure uninterrupted refrigeration of the other compartment, and can solve the problem that the temperature in the compartment rises during the defrosting process of the refrigerator. Using the condensation heat for defrosting, the defrosting temperature is low and stable, usually about the ambient temperature + 15°C, and it will not affect the temperature inside the box. Using the condensation heat of the refrigerant for defrosting, there is no need to arrange a defrosting heater with strong electricity (220V) on the evaporator, which is safer for the use of flammable and explosive refrigerants. In addition, since the condenser tubes are evenly distributed on the evaporator, the defrosting is more uniform, the defrosting time is shorter, and the defrosting efficiency is higher.

[0063] As one optional embodiment, the controller is further configured to:

[0064] When the evaporator to be defrosted is the first evaporator, the target condenser is the first condenser, and the evaporator to be refrigerated is the second evaporator;

[0065] When the evaporator to be defrosted is the second evaporator, the target condenser is the second evaporator, and the evaporator to be refrigerated is the first evaporator.

[0066] Specifically, please refer to Figure 7 and 8 , Figure 7 which is a schematic diagram of the refrigerant flow during defrosting of a refrigerator provided by an embodiment of the present invention, Figure 8 and which is a schematic diagram of the refrigerant flow during defrosting of a refrigerator provided by another embodiment of the present invention. Figure 7 Taking the defrosting of the first compartment as an example, control the high-temperature refrigerant discharged by the compressor 201 to flow through the first solenoid valve 207 to the target condenser corresponding to the evaporator to be defrosted, i.e., the first condenser 203 corresponding to the first evaporator 205, and use the heat of the high-temperature refrigerant to exchange heat and defrost the first evaporator 205. The refrigerant after heat exchange flows to the main condenser 202 to continue condensation to ensure sufficient condensation and improve the system efficiency. The condensed refrigerant flows through the second solenoid valve 208 to the evaporator to be refrigerated, i.e., the second evaporator 206, to refrigerate the compartment to be refrigerated and achieve uninterrupted refrigeration of the compartment to be refrigerated.

[0067] Figure 8 Taking the defrosting of the second compartment as an example, control the high-temperature refrigerant discharged by the compressor 201 to flow through the first solenoid valve 207 to the target condenser corresponding to the evaporator to be defrosted, i.e., the second condenser 204 corresponding to the second evaporator 206, and use the heat of the high-temperature refrigerant to exchange heat and defrost the second evaporator 206. The refrigerant after heat exchange flows to the main condenser 202 to continue condensation to ensure sufficient condensation and improve the system efficiency. The condensed refrigerant flows through the second solenoid valve 208 to the evaporator to be refrigerated, i.e., the first evaporator 205, to refrigerate the compartment to be refrigerated and achieve uninterrupted refrigeration of the compartment to be refrigerated.

[0068] As one of the optional embodiments, the controller is further configured to:

[0069] When the refrigerator is refrigerating, control the high-temperature refrigerant discharged by the compressor to flow through the first solenoid valve to the main condenser for condensation. The condensed refrigerant flows through the second solenoid valve to the first evaporator and the second evaporator respectively to refrigerate the first compartment and the second compartment.

[0070] Specifically, please refer to Figure 9 , Figure 9It is a schematic diagram of the refrigerant flow when the refrigerator is refrigerating according to an embodiment of the present invention. When the refrigerator is refrigerating according to the embodiment of the present invention, it is controlled that the high-temperature refrigerant discharged by the compressor 201 flows through the first solenoid valve 207 to the main condenser 202 for condensation, and the condensed refrigerant flows through the second solenoid valve 208 to the first evaporator 205 and the second evaporator 206 respectively to refrigerate the first compartment and the second compartment.

[0071] As one optional embodiment, the refrigeration system further includes a first decompression tube and a second decompression tube;

[0072] The input end of the first decompression tube is connected to the second solenoid valve, and the output end of the first decompression tube is connected to the first evaporator; the condensed refrigerant flows through the second solenoid valve and the first decompression tube to the first evaporator to refrigerate the first compartment;

[0073] The input end of the second decompression tube is connected to the second solenoid valve, and the output end of the second decompression tube is connected to the second evaporator; the condensed refrigerant flows through the second solenoid valve and the second decompression tube to the second evaporator to refrigerate the second compartment.

[0074] Specifically, please refer to Figure 6 , in the embodiment of the present invention, the refrigeration system further includes a first decompression tube 209 and a second decompression tube 210. The input end of the first decompression tube 209 is connected to the second solenoid valve 208, and the output end of the first decompression tube 209 is connected to the first evaporator 205. The condensed refrigerant flows through the second solenoid valve 208 and the first decompression tube 209 to the first evaporator 205 to refrigerate the first compartment. The input end of the second decompression tube 210 is connected to the second solenoid valve 208, and the output end of the second decompression tube 210 is connected to the second evaporator 206. The condensed refrigerant flows through the second solenoid valve 208 and the second decompression tube 210 to the second evaporator 206 to refrigerate the second compartment.

[0075] It should be noted that in the embodiment of the present invention, the decompression tube is a capillary tube, and its main function is to throttle and depressurize the high-pressure normal-temperature refrigerant liquid when flowing through the capillary tube, turning it into a low-temperature and low-pressure refrigerant wet vapor (mostly liquid and very little steam) and entering the evaporator, where it absorbs heat and evaporates, and at the same time achieves the purpose of cooling and refrigeration.

[0076] As one optional embodiment, the refrigeration system further includes a return air pipe, the return air pipe is respectively connected to the first evaporator and the second evaporator, and the refrigerant in the first evaporator and / or the second evaporator flows back to the compressor through the return air pipe.

[0077] Specifically, please refer to Figure 6, in the embodiment of the present invention, the refrigeration system further includes a return air pipe 211, and the return air pipe 211 is respectively connected to the first evaporator 205 and the second evaporator 206. The refrigerant in the first evaporator 205 and / or the second evaporator 206 flows back to the compressor 201 through the return air pipe 211 to complete a refrigeration cycle.

[0078] Please refer to Figure 10 , Figure 10 is a schematic flow chart of a refrigerator defrosting control method provided by an embodiment of the present invention. The refrigerator defrosting control method provided by the embodiment of the present invention is applied to a refrigerator including a box body and a refrigeration system; wherein, several compartments are arranged inside the box body; the refrigeration system includes a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first solenoid valve and a second solenoid valve; the first condenser is arranged on the side of the first evaporator, and both the first condenser and the first evaporator are arranged in the first compartment; the second condenser is arranged on the side of the second evaporator, and both the second condenser and the second evaporator are arranged in the second compartment. The refrigerator defrosting control method includes:

[0079] S1. When the refrigerator is defrosting, control the high-temperature refrigerant discharged by the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and use the heat of the high-temperature refrigerant to perform heat exchange defrosting on the evaporator to be defrosted;

[0080] S2. The refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator.

[0081] In the embodiment of the present invention, condensers are evenly arranged on the sides of the evaporators, and the flow direction of the refrigerant is controlled by solenoid valves to realize the refrigeration and defrosting control of the evaporators. In the refrigeration system of the embodiment of the present invention, it includes a compressor 201, a main condenser 202, a first condenser 203, a second condenser 204, a first evaporator 205, a second evaporator 206, a first solenoid valve 207 and a second solenoid valve 208. Among them, the first condenser is arranged on the side of the first evaporator, and both the first condenser and the first evaporator are arranged in the first compartment. The second condenser is arranged on the side of the second evaporator, and both the second condenser and the second evaporator are arranged in the second compartment.

[0082] When the refrigerator defrosts, it controls the high-temperature refrigerant discharged by the compressor 201 to flow through the first solenoid valve 207 to the target condenser corresponding to the evaporator to be defrosted, and uses the heat of the high-temperature refrigerant to exchange heat and defrost the evaporator to be defrosted. The refrigerant after heat exchange flows to the main condenser 202 to continue condensation to ensure sufficient condensation and improve the system efficiency. The condensed refrigerant flows through the second solenoid valve 208 to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated, realizing uninterrupted refrigeration of the compartment to be refrigerated. Among them, the evaporator to be defrosted is the first evaporator 205 or the second evaporator 206; the target condenser is the first condenser 203 or the second condenser 204; the evaporator to be refrigerated is the second evaporator 206 or the first evaporator 205.

[0083] In the embodiment of the present invention, the heat of the high-temperature refrigerant discharged by the refrigerator compressor is used to defrost the evaporator, without consuming additional electric energy, which can significantly reduce the power consumption of the refrigerator. During the defrosting process, the compressor does not need to stop, which does not affect the normal operation of the refrigerator. While defrosting one compartment, it can ensure uninterrupted refrigeration of another compartment, and can solve the problem that the temperature in the compartment rises during the defrosting process of the refrigerator. Using the condensation heat for defrosting, the defrosting temperature is low and stable, usually about the ambient temperature + 15°C, and it will not affect the temperature inside the box. Using the condensation heat of the refrigerant for defrosting, there is no need to arrange a defrosting heater with strong electricity (220V) on the evaporator, which is safer for the use of flammable and explosive refrigerants. In addition, since the condenser tubes are evenly distributed on the evaporator, the defrosting is more uniform, the defrosting time is shorter, and the defrosting efficiency is higher.

[0084] As an optional embodiment, the method further includes:

[0085] When the evaporator to be defrosted is the first evaporator, the target condenser is the first condenser, and the evaporator to be refrigerated is the second evaporator;

[0086] When the evaporator to be defrosted is the second evaporator, the target condenser is the second evaporator, and the evaporator to be refrigerated is the first evaporator.

[0087] Specifically, taking the defrosting of the first compartment as an example, it controls the high-temperature refrigerant discharged by the compressor 201 to flow through the first solenoid valve 207 to the target condenser, that is, the first condenser 203, corresponding to the evaporator to be defrosted, that is, the first evaporator 205, and uses the heat of the high-temperature refrigerant to exchange heat and defrost the first evaporator 205. The refrigerant after heat exchange flows to the main condenser 202 to continue condensation to ensure sufficient condensation and improve the system efficiency. The condensed refrigerant flows through the second solenoid valve 208 to the evaporator to be refrigerated, that is, the second evaporator 206, to refrigerate the compartment to be refrigerated, realizing uninterrupted refrigeration of the compartment to be refrigerated.

[0088] Taking the defrosting of the second compartment as an example, control the high-temperature refrigerant discharged from the compressor 201 to flow through the first solenoid valve 207 to the target condenser corresponding to the evaporator to be defrosted, i.e., the second evaporator 206, which is the second condenser 204. Use the heat of the high-temperature refrigerant to exchange heat and defrost the second evaporator 206. The refrigerant after heat exchange flows to the main condenser 202 to continue condensation to ensure sufficient condensation and improve the system efficiency. The condensed refrigerant flows through the second solenoid valve 208 to the evaporator to be refrigerated, i.e., the first evaporator 205, to refrigerate the compartment to be refrigerated, realizing uninterrupted refrigeration of the compartment to be refrigerated.

[0089] As one of the optional embodiments, the method further includes:

[0090] When the refrigerator is refrigerating, control the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the main condenser for condensation. The condensed refrigerant flows through the second solenoid valve to the first evaporator and the second evaporator respectively to refrigerate the first compartment and the second compartment.

[0091] Specifically, in the embodiment of the present invention, when the refrigerator is refrigerating, control the high-temperature refrigerant discharged from the compressor 201 to flow through the first solenoid valve 207 to the main condenser 202 for condensation. The condensed refrigerant flows through the second solenoid valve 208 to the first evaporator 205 and the second evaporator 206 respectively to refrigerate the first compartment and the second compartment.

[0092] As one of the optional embodiments, the refrigeration system further includes a first decompression pipe and a second decompression pipe;

[0093] The input end of the first decompression pipe is connected to the second solenoid valve, and the output end of the first decompression pipe is connected to the first evaporator; the condensed refrigerant flows through the second solenoid valve and the first decompression pipe to the first evaporator to refrigerate the first compartment;

[0094] The input end of the second decompression pipe is connected to the second solenoid valve, and the output end of the second decompression pipe is connected to the second evaporator; the condensed refrigerant flows through the second solenoid valve and the second decompression pipe to the second evaporator to refrigerate the second compartment.

[0095] Specifically, in the embodiment of the present invention, the refrigeration system further includes a first pressure reducing pipe 209 and a second pressure reducing pipe 210. The input end of the first pressure reducing pipe 209 is connected to the second solenoid valve 208, and the output end of the first pressure reducing pipe 209 is connected to the first evaporator 205. The condensed refrigerant flows through the second solenoid valve 208 and the first pressure reducing pipe 209 to the first evaporator 205 to refrigerate the first compartment. The input end of the second pressure reducing pipe 210 is connected to the second solenoid valve 208, and the output end of the second pressure reducing pipe 210 is connected to the second evaporator 206. The condensed refrigerant flows through the second solenoid valve 208 and the second pressure reducing pipe 210 to the second evaporator 206 to refrigerate the second compartment.

[0096] As an optional embodiment, the refrigeration system further includes a return air pipe, and the return air pipe is respectively connected to the first evaporator and the second evaporator. The refrigerant in the first evaporator and / or the second evaporator flows back to the compressor through the return air pipe.

[0097] Specifically, in the embodiment of the present invention, the refrigeration system further includes a return air pipe 211. The return air pipe 211 is respectively connected to the first evaporator 205 and the second evaporator 206. The refrigerant in the first evaporator 205 and / or the second evaporator 206 flows back to the compressor 201 through the return air pipe 211 to complete a refrigeration cycle.

[0098] The embodiment of the present invention provides a refrigerator and its defrosting control method. By uniformly arranging the condensation pipes on the evaporator, when the refrigerator defrosts, it controls the high-temperature refrigerant discharged by the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and uses the heat of the high-temperature refrigerant to exchange heat and defrost the evaporator to be defrosted; the refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator. The embodiment of the present invention uses the heat of the high-temperature refrigerant discharged by the refrigerator compressor to defrost the evaporator, without consuming additional electric energy, which can significantly reduce the power consumption of the refrigerator. At the same time, using the condensation heat for defrosting, the defrosting temperature is low and stable, and it will not affect the temperature inside the box. In addition, since the condensation pipes are evenly distributed on the evaporator, the defrosting is more uniform, the defrosting time is shorter, and the defrosting efficiency is higher.

[0099] It should be noted that the system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the system embodiments provided by the present invention, the connection relationships between the modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0100] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A refrigerator, characterized in that, Comprising: A box body, which serves as the support structure of the refrigerator and is internally provided with several compartments; A refrigeration system, which is arranged in the box body and includes a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first solenoid valve and a second solenoid valve; The first condenser is arranged on the side of the first evaporator, and both the first condenser and the first evaporator are arranged in the first compartment; The second condenser is arranged on the side of the second evaporator, and both the second condenser and the second evaporator are arranged in the second compartment; The controller is configured to, when the refrigerator defrosts, control the high-temperature refrigerant discharged by the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and use the heat of the high-temperature refrigerant to perform heat exchange defrosting on the evaporator to be defrosted; the refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator.

2. The refrigerator according to claim 1, wherein The controller is further configured to: When the evaporator to be defrosted is the first evaporator, the target condenser is the first condenser, and the evaporator to be refrigerated is the second evaporator; When the evaporator to be defrosted is the second evaporator, the target condenser is the second condenser, and the evaporator to be refrigerated is the first evaporator.

3. The refrigerator according to claim 2, wherein, The controller is further configured to: When the refrigerator refrigerates, control the high-temperature refrigerant discharged by the compressor to flow through the first solenoid valve to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the first evaporator and the second evaporator respectively to refrigerate the first compartment and the second compartment.

4. The refrigerator according to claim 3, wherein, The refrigeration system further includes a first decompression pipe and a second decompression pipe; The input end of the first decompression pipe is connected to the second solenoid valve, and the output end of the first decompression pipe is connected to the first evaporator; the condensed refrigerant flows through the second solenoid valve and the first decompression pipe to the first evaporator to refrigerate the first compartment; The input end of the second decompression pipe is connected to the second solenoid valve, and the output end of the second decompression pipe is connected to the second evaporator; the condensed refrigerant flows through the second solenoid valve and the second decompression pipe to the second evaporator to refrigerate the second compartment.

5. The refrigerator according to claim 4, characterized in that, The refrigeration system further includes a return air pipe, the return air pipe is respectively connected to the first evaporator and the second evaporator, and the refrigerant in the first evaporator and / or the second evaporator flows back to the compressor through the return air pipe.

6. A defrost control method for a refrigerator, characterized in that, The method is applied to a refrigerator including a cabinet and a refrigeration system; wherein, several compartments are provided inside the cabinet; the refrigeration system includes a compressor, a main condenser, a first condenser, a second condenser, a first evaporator, a second evaporator, a first solenoid valve, and a second solenoid valve; the first condenser is disposed on the side of the first evaporator, and both the first condenser and the first evaporator are disposed in the first compartment; the second condenser is disposed on the side of the second evaporator, and both the second condenser and the second evaporator are disposed in the second compartment. The refrigerator defrost control method includes: When the refrigerator is defrosting, controlling the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the target condenser corresponding to the evaporator to be defrosted, and using the heat of the high-temperature refrigerant to exchange heat with the evaporator to be defrosted for defrosting; The refrigerant after heat exchange flows to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the evaporator to be refrigerated to refrigerate the compartment to be refrigerated; wherein, the evaporator to be defrosted is the first evaporator or the second evaporator; the target condenser is the first condenser or the second condenser; the evaporator to be refrigerated is the second evaporator or the first evaporator.

7. The defrost control method of the refrigerator according to claim 6, characterized in that, The method further includes: When the evaporator to be defrosted is the first evaporator, the target condenser is the first condenser, and the evaporator to be refrigerated is the second evaporator; When the evaporator to be defrosted is the second evaporator, the target condenser is the second condenser, and the evaporator to be refrigerated is the first evaporator.

8. The refrigerator defrosting control method according to claim 7, characterized in that, The method further includes: When the refrigerator is refrigerating, controlling the high-temperature refrigerant discharged from the compressor to flow through the first solenoid valve to the main condenser for condensation, and the condensed refrigerant flows through the second solenoid valve to the first evaporator and the second evaporator respectively to refrigerate the first compartment and the second compartment.

9. The defrost control method of a refrigerator according to claim 8, characterized in that, The refrigeration system further includes a first decompression pipe and a second decompression pipe; The input end of the first decompression pipe is connected to the second solenoid valve, and the output end of the first decompression pipe is connected to the first evaporator; the condensed refrigerant flows through the second solenoid valve and the first decompression pipe to the first evaporator to refrigerate the first compartment; The input end of the second decompression pipe is connected to the second solenoid valve, and the output end of the second decompression pipe is connected to the second evaporator; the condensed refrigerant flows through the second solenoid valve and the second decompression pipe to the second evaporator to refrigerate the second compartment.

10. The refrigerator defrosting control method according to claim 9, characterized in that, The refrigeration system further includes a return air pipe, the return air pipe is respectively connected to the first evaporator and the second evaporator, and the refrigerant in the first evaporator and / or the second evaporator flows back to the compressor through the return air pipe.

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