Refrigerator and refrigeration control method thereof

Abstract

The application discloses a refrigerator and a refrigeration control method thereof. The refrigerator comprises a cabinet, a refrigeration system and a controller. The refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a secondary cooler, an electromagnetic valve, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator. When normal refrigeration is performed, the controller controls the electromagnetic valve to be closed, and the separated liquid refrigerant enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator to perform refrigeration. The separated gaseous refrigerant is stored in the secondary cooler. When deep refrigeration is performed, the controller controls the electromagnetic valve to be opened, and the separated liquid refrigerant enters the refrigeration evaporator and the variable-temperature evaporator to perform refrigeration. The separated gaseous refrigerant is cooled in the secondary cooler and then enters the freezing evaporator to perform refrigeration. The application can select different refrigerants according to different refrigeration requirements, and the corresponding refrigeration requirements can be realized by using a smaller compression ratio, so that the refrigeration efficiency is improved, and the noise in the refrigeration process is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigerators, in particular to a refrigerator and a refrigeration control method thereof. BACKGROUND

[0002] At present, in order to achieve deep cooling refrigeration, the refrigeration system of the refrigerator usually adopts R290 refrigerant or mixed refrigerant, but the existing refrigeration system can only adopt a single working condition and cannot change the circulating refrigerant according to different refrigeration working conditions. At present, the refrigerator using mixed refrigerant in deep cooling state uses R600a refrigerant to cool R290 refrigerant, and then uses R290 refrigerant to refrigerate the freezer room, and other compartments are refrigerated by R600a refrigerant. In the ordinary state, the existing refrigeration system uses mixed refrigerant of R600a refrigerant and R290 refrigerant to refrigerate the compartments, so that the compression ratio is large, the energy consumption is high, and the refrigeration efficiency is low. And because the compression ratio is large, the vibration generated by the refrigerator compressor during operation is large, and the noise of the refrigerator during the whole refrigeration process is high. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a refrigerator and a refrigeration control method thereof. For a three-system refrigerator, when using mixed refrigerant for refrigeration, different refrigerants can be selected for refrigeration according to different refrigeration requirements, a smaller compression ratio can be used to achieve the corresponding refrigeration requirement, and the refrigeration efficiency is effectively improved, and the noise during the refrigeration process is reduced.

[0004] The refrigerator provided in the first embodiment of the present application comprises:

[0005] A cabinet body serving as a support structure of the refrigerator, and comprising a plurality of compartments inside;

[0006] A refrigeration system arranged in the cabinet body, comprising a compressor, a condenser, a gas-liquid separator, a secondary cooler, a solenoid valve, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator;

[0007] The exhaust port of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; the gas-liquid separator is used for separating the mixed refrigerant, the gas outlet end of the gas-liquid separator is connected with the inlet of the secondary cooler, and the liquid outlet end of the gas-liquid separator is connected with the inlet of the electric valve;

[0008] The outlet of the secondary cooler is connected with the freezing evaporator through the solenoid valve; the electric valve is used for dividing the liquid refrigerant separated by the gas-liquid separator into three paths and entering different refrigeration pipelines;

[0009] The controller is configured to control the electromagnetic valve to be in a closed state when the refrigerator operates in a normal refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator through the electric valve for refrigeration; and the separated gaseous refrigerant is stored in the secondary cooler and is subjected to secondary cooling.

[0010] When the refrigerator operates in a deep cooling refrigeration mode, the electromagnetic valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator and the variable-temperature evaporator through the electric valve for refrigeration; and the separated gaseous refrigerant is subjected to secondary cooling through the secondary cooler and then enters the freezing evaporator through the electromagnetic valve for refrigeration.

[0011] The second embodiment of the present application provides a refrigerator, wherein the refrigeration pipeline comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline.

[0012] The first refrigeration pipeline is connected with the first outlet of the electric valve, passes through a first capillary and the refrigeration evaporator and then enters the suction port of the compressor;

[0013] The second refrigeration pipeline is connected with the second outlet of the electric valve, passes through a second capillary and the variable-temperature evaporator and then enters the suction port of the compressor;

[0014] The third refrigeration pipeline is connected with the third outlet of the electric valve, passes through a third capillary and the freezing evaporator and then enters the suction port of the compressor.

[0015] The third embodiment of the present application provides a refrigerator, wherein the electromagnetic valve is connected with the inlet of the third capillary, and the outlet of the third capillary is connected with the freezing evaporator;

[0016] When the refrigerator operates in a normal refrigeration mode, the electromagnetic valve is in a closed state, and the first outlet, the second outlet and the third outlet of the electric valve are all in an open state;

[0017] When the refrigerator operates in a deep cooling refrigeration mode, the electromagnetic valve is in an open state, the first outlet and the second outlet of the electric valve are in an open state, and the third outlet is in a closed state.

[0018] The fourth embodiment of the present application provides a refrigerator, wherein the outlet of the refrigeration evaporator, the outlet of the variable-temperature evaporator and the outlet of the freezing evaporator are all connected with the suction port of the compressor; and the refrigerant passes through the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator and then converges together and enters the suction port of the compressor again.

[0019] The fifth embodiment of the present application provides a refrigerator, wherein the mixed refrigerant is made of R290 refrigerant and R600a refrigerant; the mixed refrigerant sequentially passes through the compressor and the condenser, and then enters the gas-liquid separator for separation; the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0020] The sixth embodiment of the present application provides a refrigerator refrigeration control method, which is applied to a refrigerator comprising a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a secondary cooler, an electromagnetic valve, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator; the gas-liquid separator is used for separating a mixed refrigerant, the gas outlet end of the gas-liquid separator is connected with the inlet of the secondary cooler, and the liquid outlet end of the gas-liquid separator is connected with the inlet of the electric valve; the outlet of the secondary cooler is connected with the freezing evaporator through the electromagnetic valve; the electric valve is used for dividing the separated liquid refrigerant after the gas-liquid separator into three paths and entering different refrigeration pipelines respectively; and the refrigerator refrigeration control method comprises the following steps:

[0021] When the refrigerator operates in a normal refrigeration mode, the electromagnetic valve is controlled to be in a closed state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator respectively through the electric valve for refrigeration; and the separated gaseous refrigerant is stored in the secondary cooler and is subjected to secondary cooling.

[0022] When the refrigerator operates in a deep refrigeration mode, the electromagnetic valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the refrigeration evaporator and the variable-temperature evaporator respectively through the electric valve for refrigeration; and the separated gaseous refrigerant is subjected to secondary cooling through the secondary cooler and then enters the freezing evaporator through the electromagnetic valve for refrigeration.

[0023] The seventh embodiment of the present application provides a refrigerator refrigeration control method, wherein the refrigeration pipeline comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline;

[0024] The first refrigeration pipeline is connected with the first outlet of the electric valve, passes through a first capillary tube and the refrigeration evaporator, and then enters the suction port of the compressor;

[0025] The second refrigeration pipeline is connected with the second outlet of the electric valve, passes through a second capillary tube and the variable-temperature evaporator, and then enters the suction port of the compressor;

[0026] The third refrigeration pipeline is connected with the third outlet of the electric valve, passes through a third capillary tube and the freezing evaporator, and then enters the suction port of the compressor.

[0027] The eighth embodiment of the present application provides a refrigerator refrigeration control method, wherein the electromagnetic valve is connected with the inlet of the third capillary tube, and the outlet of the third capillary tube is connected with the freezing evaporator.

[0028] When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is in the closed state, and the first outlet, the second outlet and the third outlet of the electric valve are all in the open state.

[0029] When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve is in the open state, the first outlet and the second outlet of the electric valve are in the open state, and the third outlet is in the closed state.

[0030] The ninth embodiment of the present application provides a refrigerator refrigeration control method, wherein the outlet of the refrigeration evaporator, the outlet of the variable-temperature evaporator and the outlet of the freezing evaporator are all connected with the suction port of the compressor; the refrigerant passes through the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator, and then is combined together and then enters the suction port of the compressor again.

[0031] The tenth embodiment of the present application provides a refrigerator refrigeration control method, wherein the mixed refrigerant is made by mixing R290 refrigerant and R600a refrigerant; the mixed refrigerant passes through the compressor and the condenser in sequence, and then enters the gas-liquid separator for separation; the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0032] Compared with the prior art, the refrigerator and the refrigeration control method thereof provided by the embodiment of the present application have the beneficial effects that for a three-system refrigerator, in the process of refrigeration using a mixed refrigerant, different refrigerants inside the system are selected for refrigeration according to different set refrigeration temperatures, and the advantages of different refrigerants are effectively utilized. When the refrigerator operates in a normal refrigeration mode, the mixed refrigerant is no longer used for refrigeration, but the R290 refrigerant is stored, and only the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art solution, the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in a deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, therefore, the R290 refrigerant can be used for refrigeration in the freezing chamber of the refrigerator, and the R600a refrigerant is still used for refrigeration in other chambers of the refrigerator. In the refrigeration process at this time, the suction and discharge side compression ratio of the compressor is smaller than that of other products using a single refrigerant, the efficiency is higher, and because the compression ratio is small, the vibration generated by the compressor in the working process is small, and the noise of the refrigerator in the overall refrigeration process is low. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 is a structural schematic diagram of a refrigerator provided by an embodiment of the present application;

[0034] Figure 2 is a structural schematic diagram of a refrigerator provided by an embodiment of the present application;

[0035] Figure 3 is a structural schematic diagram of a chamber of a refrigerator provided by an embodiment of the present application;

[0036] Figure 4 is a structural schematic diagram of a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0037] Figure 5 is a distribution schematic diagram of an evaporator in a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0038] Figure 6 is a structural schematic diagram of a gas-liquid separator in a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0039] Figure 7 is a cooling schematic diagram of a secondary cooler in a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0040] Figure 8 is a flow direction schematic diagram of a refrigerant when a refrigerator is in normal refrigeration provided by an embodiment of the present application;

[0041] Figure 9is a refrigerant flow direction schematic diagram of a refrigerator in a deep cooling refrigeration provided by an embodiment of the present application;

[0042] Figure 10 is a refrigeration control method flow schematic diagram of a refrigerator provided by an embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0045] The terms "first", "second", are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0046] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] Please refer to Figure 1 , Figure 1 is a structure schematic diagram of a refrigerator provided by an embodiment of the present application. The refrigerator provided in the embodiment of the present application comprises:

[0048] The cabinet 100 is a supporting structure of the refrigerator, and a plurality of compartments are arranged inside the cabinet 100;

[0049] A refrigeration system 20 is arranged in the cabinet and comprises a compressor, a condenser, a gas-liquid separator, a secondary cooler, a solenoid valve, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator;

[0050] An exhaust port of the compressor is connected with an inlet of the condenser, and an outlet of the condenser is connected with an inlet of the gas-liquid separator; the gas-liquid separator is used for separating mixed refrigerant, a gas outlet end of the gas-liquid separator is connected with an inlet of the secondary cooler, and a liquid outlet end of the gas-liquid separator is connected with an inlet of the electric valve;

[0051] An outlet of the secondary cooler is connected with the freezing evaporator through the solenoid valve; the electric valve is used for dividing the liquid refrigerant separated by the gas-liquid separator into three paths and entering different refrigeration pipelines respectively;

[0052] A controller 30 is configured to control the solenoid valve to be in a closed state when the refrigerator operates in a normal refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, the liquid refrigerant separated after the separation enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator respectively through the electric valve for refrigeration; and the gaseous refrigerant separated after the separation is stored in the secondary cooler and is subjected to secondary cooling;

[0053] When the refrigerator operates in a deep refrigeration mode, the solenoid valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the liquid refrigerant separated after the separation enters the refrigeration evaporator and the variable-temperature evaporator respectively through the electric valve for refrigeration; and the gaseous refrigerant separated after the separation is subjected to secondary cooling through the secondary cooler and then enters the freezing evaporator through the solenoid valve for refrigeration.

[0054] Specifically, the refrigerator provided by the embodiment of the present application comprises a cabinet 100, a refrigeration system 20 and a controller 30. Please refer to Figure 2 and Figure 3 , Figure 2 is a structural schematic view of a cabinet of a refrigerator provided by an embodiment of the present application, Figure 3 is a structural schematic view of a compartment of a refrigerator. The refrigerator in the embodiment has a shape similar to a cuboid, and comprises a cabinet 100 defining a storage space. The cabinet 100 serves as a support structure of the refrigerator and is internally provided with a cavity, wherein the cavity comprises a component storage cavity for placing components in the refrigerator, such as a compressor, and further comprises a storage space for storing food and the like. The storage space can be divided into a plurality of storage compartments (i.e. compartments), and the storage compartments can be configured as a refrigeration compartment 101, a variable-temperature compartment 102 (also referred to as a fresh-keeping compartment) and a freezing compartment 103 according to different purposes. One or more door bodies 200 are arranged at an opening of each storage compartment, for example, a refrigeration door body 201 is arranged at the opening of the refrigeration compartment 101, a variable-temperature door body 202 is arranged at the opening of the variable-temperature compartment 102, and a freezing door body 203 is arranged at the opening of the freezing compartment 103.Figure 2 In the upper storage chamber is a refrigeration chamber, which is provided with a double door body. The door body 200 includes a door body shell 210 located outside the cabinet 100, a door body inner container 220 located inside the cabinet 100, an upper end cover 230, a lower end cover 240, and a heat insulation layer located between the door body shell 210, the door body inner container 220, the upper end cover 230, and the lower end cover 240. Generally, the heat insulation layer is filled with foaming material. The door body can be pivotally arranged at the opening of the cabinet, and can also be a drawer type to realize drawer type storage.

[0055] The refrigerator performs a refrigeration operation through a refrigeration system to provide cold energy to the compartments to maintain the compartments at a constant low temperature. Specifically, the refrigeration system of the refrigerator in the embodiment is a three-refrigeration system. Please refer to Figure 4 , Figure 4 is a structural diagram of a refrigeration system of a refrigerator according to an embodiment of the present application. The refrigeration system of the refrigerator according to the embodiment of the present application includes a compressor 1, a condenser 2, a gas-liquid separator 3, a secondary cooler 4, a solenoid valve 5, an electric valve 6, a refrigeration evaporator 7, a variable-temperature evaporator 8, and a freezing evaporator 9. Please refer to Figure 5 , Figure 5 is a distribution diagram of evaporators in a refrigeration system of a refrigerator according to an embodiment of the present application. The refrigeration evaporator 7, the variable-temperature evaporator 8, and the freezing evaporator 9 are respectively arranged inside corresponding compartments to perform refrigeration on the compartments. That is, the refrigeration evaporator 7 is arranged inside the refrigeration chamber 101 to perform refrigeration on the refrigeration chamber 101, the variable-temperature evaporator 8 is arranged inside the variable-temperature chamber 102 to perform refrigeration on the variable-temperature chamber 102, and the freezing evaporator 9 is arranged inside the freezing chamber 103 to perform refrigeration on the freezing chamber 103. The exhaust port of the compressor 1 is connected with the inlet of the condenser 2, and the outlet of the condenser 2 is connected with the inlet of the gas-liquid separator 3. Please refer to Figure 6 , Figure 6 is a structural diagram of a gas-liquid separator in a refrigeration system of a refrigerator according to an embodiment of the present application. The gas-liquid separator 3 is used to separate mixed refrigerant, liquid is at the bottom of the gas-liquid separator 3, and gas is at the top of the gas-liquid separator 3. The gas outlet end of the gas-liquid separator 3 is connected with the inlet of the secondary cooler 4, and the liquid outlet end of the gas-liquid separator 3 is connected with the inlet of the electric valve 6. Please refer to Figure 7 , Figure 7is a cooling schematic diagram of a secondary cooler in a refrigeration system of a refrigerator provided by an embodiment of the present application. The secondary cooler 4 and the refrigeration evaporator 7 are oppositely arranged, and heat transfer can be performed between the two, so that the refrigerant stored in the secondary cooler 4 can be secondarily cooled. The outlet of the secondary cooler 4 is connected with the freezing evaporator 9 through the electromagnetic valve 5, and the electric valve 6 is used to divide the liquid refrigerant separated through the gas-liquid separator 3 into three paths A, B and C, which are respectively introduced into different refrigeration pipelines, and the path C of the electric valve 6 and the outlet of the electromagnetic valve 5 are one path, and finally the three paths are combined together and returned to the suction port of the compressor.

[0056] The working constitution of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process.

[0057] The compression process is that when the refrigerator power cord is plugged in and the refrigerator has a refrigeration demand, the compressor starts to work, the low-temperature and low-pressure refrigerant is sucked into the compressor, is compressed into high-temperature and high-pressure superheated gas in the cylinder of the compressor, and is discharged to the condenser;

[0058] The condensation process is that the high-temperature and high-pressure refrigerant gas is cooled through the condenser, the temperature is continuously lowered, and the refrigerant is gradually cooled into saturated vapor at normal temperature and high pressure, and is further cooled into saturated liquid, and the temperature no longer decreases, and the temperature at this time is called the condensation temperature, and the pressure of the refrigerant in the entire condensation process is almost unchanged;

[0059] The throttling process is that the refrigerant saturated liquid after condensation is filtered to remove water and impurities through the drying filter, and then flows into the capillary tube to be throttled and decompressed, and the refrigerant becomes wet vapor at normal temperature and low pressure;

[0060] The evaporation process is that then the refrigerant starts to absorb heat to vaporize in the evaporator, not only the temperature of the evaporator and its surrounding is lowered, but also the refrigerant becomes low-temperature and low-pressure gas, and the refrigerant from the evaporator returns to the compressor again to repeat the above process, so that the heat in the refrigerator is transferred to the air outside the refrigerator, and the refrigeration purpose is achieved.

[0061] Please refer to Figure 8 , Figure 8is a flow direction schematic diagram of a refrigerator in normal refrigeration provided by an embodiment of the present application. When the refrigerator operates in the normal refrigeration mode, the solenoid valve 5 is in the closed state. At this time, the mixed refrigerant enters the condenser 2 from the discharge port of the compressor 1 for cooling. Since the mixed refrigerant is composed of two different refrigerants, the condensation temperatures of the different refrigerants are different. Therefore, under the pressure at this time, the mixed refrigerant cooled in the condenser 2, the R600a refrigerant is cooled to a liquid state, and the R290 refrigerant is still a gas. The gas-liquid mixed refrigerant from the outlet of the condenser 2 enters the inlet of the gas-liquid separator 3, and after separation by the gas-liquid separator 3, the liquid refrigerant is at the bottom of the gas-liquid separator 3, and the gaseous refrigerant is at the top of the gas-liquid separator 3. Since the solenoid valve 5 is in the closed state, at this time the separated gaseous refrigerant R290 refrigerant is always stored in the upper part of the gas-liquid separator 3, and the liquid refrigerant R600a refrigerant at the bottom enters the inlet of the electric valve 6, is divided into three paths A, B, and C, respectively, passes through the capillary tubes, and enters the refrigeration evaporator 7, the temperature-changing evaporator 8, and the freezing evaporator 9, respectively, to evaporate and absorb heat in different evaporators to cool different compartments, and finally converges together to return to the suction port on the right side of the compressor. At this time, since the separated gaseous refrigerant R290 refrigerant is always accumulated in the upper part of the gas-liquid separator 3, it then flows along the upper pipe to the secondary cooler 4. Since the solenoid valve 5 is in the closed state, the refrigerant cannot continue to flow and can only accumulate in the secondary cooler 4, and the secondary cooler 4 is close to the refrigeration evaporator 7 and can be cooled. At this time, the cooled R290 refrigerant changes from a gas to a liquid. After one refrigeration cycle, the originally mixed refrigerant R290 in the refrigeration system has been separated and cooled to a liquid state and stored in the secondary cooler 4. At this time, the refrigeration system uses R600a for refrigeration, which has high refrigeration efficiency, low energy consumption, and low noise.

[0062] Please refer to Figure 9 , Figure 9is a flow direction schematic diagram of a refrigerator in deep cooling refrigeration provided by an embodiment of the present application. When the refrigerator operates in deep cooling refrigeration mode, the solenoid valve 5 is in an open state, and the C path of the electric valve 6 is in a closed state. At this time, the mixed refrigerant enters the condenser 2 from the discharge port of the compressor 1 for cooling. Since the mixed refrigerant is mixed by two different refrigerants, the condensation temperatures of the different refrigerants are different, and therefore under the pressure at this time, the mixed refrigerant after cooling in the condenser 2, the R600a refrigerant is cooled to a liquid state, and the R290 refrigerant is still a gas. The gas-liquid mixed refrigerant from the outlet of the condenser 2 enters the inlet of the gas-liquid separator 3, and after separation by the gas-liquid separator 3, the liquid refrigerant is at the bottom of the gas-liquid separator 3, and the gaseous refrigerant is at the top of the gas-liquid separator 3. Since the solenoid valve 5 is in an open state, at this time the separated gaseous refrigerant R290 refrigerant passes through the upper part of the gas-liquid separator 3, and the liquid refrigerant R600a refrigerant at the bottom enters the inlet of the electric valve 6, and is divided into two paths A and B, respectively passing through the capillary tubes, and entering the refrigeration evaporator 7 and the variable-temperature evaporator 8, respectively, to evaporate and absorb heat in different evaporators to cool different compartments, and finally to converge together and return to the suction port on the right side of the compressor. At this time, since the separated gaseous refrigerant R290 refrigerant is at the upper part of the gas-liquid separator 3, and then flows along the upper pipe to the secondary cooler 4, since the solenoid valve 5 is open, the refrigerant can continue to flow, and the secondary cooler 4 is close to the refrigeration evaporator 7, so that secondary cooling can be performed, and at this time the cooled R290 refrigerant changes from a gas to a liquid. The liquid R290 refrigerant passes through the solenoid valve 5, enters the capillary tube, and then enters the freezing evaporator 9 to cool the freezing compartment. Since the evaporation temperature of the R290 refrigerant is lower under the same pressure, at this time the R290 refrigerant is used to cool the freezing compartment, and a deep cooling temperature can be achieved. After one refrigeration cycle, the separated refrigerant in the refrigeration system re-mixes into the suction port of the compressor, and then the next cycle begins. At this time, the refrigeration system uses R600a to cool the refrigeration compartment and the variable-temperature compartment, and uses R290 refrigerant to cool the freezing compartment, which can achieve a deep cooling temperature.

[0063] The embodiment of the present application is used for three-system refrigerators, in the process of refrigeration using mixed refrigerant, according to the set different refrigeration temperature, the refrigeration of different refrigerant in the system is selected, and the advantages of different refrigerants are effectively utilized. When the refrigerator operates in the normal refrigeration mode, the mixed refrigerant is no longer used for refrigeration, but the R290 refrigerant is stored, and the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art, the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in the deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, therefore, the R290 refrigerant can be used for refrigeration in the freezing chamber of the refrigerator, and the R600a refrigerant is still used for refrigeration in other chambers of the refrigerator. In the refrigeration process, the suction and discharge side compression ratio of the compressor is smaller than that of other products using single refrigerant, the efficiency is higher, and because the compression ratio is small, the vibration generated by the compressor in the working process is small, and the noise of the refrigerator in the whole refrigeration process is low.

[0064] As one of the optional embodiments, the refrigeration pipeline comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline;

[0065] The first refrigeration pipeline is connected with the first outlet of the electric valve 6, passes through the first capillary 10 and the refrigeration evaporator 7, and is connected with the suction port of the compressor 1.

[0066] The second refrigeration pipeline is connected with the second outlet of the electric valve 6, passes through the second capillary 11 and the variable-temperature evaporator 8, and is connected with the suction port of the compressor 1.

[0067] The third refrigeration pipeline is connected with the third outlet of the electric valve 6, passes through the third capillary 12 and the freezing evaporator 9, and is connected with the suction port of the compressor 1.

[0068] Specifically, in the embodiment of the present application, the electric valve 6 is used to divide the liquid refrigerant separated by the gas-liquid separator 3 into three paths, and the liquid refrigerant enters different refrigeration pipelines. The refrigeration pipeline comprises a first refrigeration pipeline A, a second refrigeration pipeline B and a third refrigeration pipeline C. The first refrigeration pipeline is connected with the first outlet of the electric valve 6, passes through the first capillary 10 and the refrigeration evaporator 7, and is connected with the suction port of the compressor 1. The second refrigeration pipeline is connected with the second outlet of the electric valve 6, passes through the second capillary 11 and the variable-temperature evaporator 8, and is connected with the suction port of the compressor 1. The third refrigeration pipeline is connected with the third outlet of the electric valve 6, passes through the third capillary 12 and the freezing evaporator 9, and is connected with the suction port of the compressor 1.

[0069] As one of the optional embodiments, the electromagnetic valve 5 is connected with the inlet of the third capillary tube 12, and the outlet of the third capillary tube 12 is connected with the freezing evaporator 9.

[0070] When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve 5 is in the closed state, and the first outlet, the second outlet and the third outlet of the electric valve 6 are all in the open state.

[0071] When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve 5 is in the open state, the first outlet and the second outlet of the electric valve 6 are in the open state, and the third outlet is in the closed state.

[0072] Specifically, in the embodiment of the present application, the electromagnetic valve 5 is connected with the inlet of the third capillary tube 12, and the outlet of the third capillary tube 12 is connected with the freezing evaporator 9. When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve 5 is in the closed state, and the first outlet, the second outlet and the third outlet of the electric valve 6 are all in the open state. Since the electromagnetic valve 5 is in the closed state, the gaseous refrigerant R290 separated at this time is stored in the upper part of the gas-liquid separator 3, and the liquid refrigerant R600a in the lower part enters the inlet of the electric valve 6, is divided into three paths A, B and C, respectively passes through the capillary tubes, enters the refrigeration evaporator 7, the variable-temperature evaporator 8 and the freezing evaporator 9, respectively evaporates and absorbs heat in different evaporators, and cools different compartments, and finally converges together and returns to the suction port of the right side of the compressor. When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve 5 is in the open state, the first outlet and the second outlet of the electric valve 6 are in the open state, and the third outlet is in the closed state. Since the electromagnetic valve 5 is in the open state, the gaseous refrigerant R290 separated at this time flows through the upper part of the gas-liquid separator 3, and then flows along the upper pipeline to the secondary cooler 4. At this time, the refrigerant can continue to flow, the secondary cooler 4 is close to the refrigeration evaporator 7, and can be cooled. At this time, the cooled R290 refrigerant changes from gas to liquid. The liquid R290 refrigerant enters the capillary tube through the electromagnetic valve 5, and then enters the freezing evaporator 9 to refrigerate the freezing compartment. The liquid refrigerant R600a in the lower part enters the inlet of the electric valve 6, is divided into two paths A and B, respectively passes through the capillary tubes, enters the refrigeration evaporator 7 and the variable-temperature evaporator 8, respectively evaporates and absorbs heat in different evaporators, cools different compartments, and finally converges together and returns to the suction port of the right side of the compressor.

[0073] As one of the optional embodiments, the outlet of the refrigeration evaporator 7, the outlet of the variable-temperature evaporator 8 and the outlet of the freezing evaporator 9 are all connected with the suction port of the compressor 1. After the refrigerant passes through the refrigeration evaporator 7, the variable-temperature evaporator 8 and the freezing evaporator 9, it converges together and enters the suction port of the compressor 1 again.

[0074] Specifically, the outlet of the refrigeration evaporator 7, the outlet of the variable-temperature evaporator 8 and the outlet of the freezing evaporator 9 are all connected to the suction port of the compressor 1, and the refrigerant after passing through the refrigeration evaporator 7, the variable-temperature evaporator 8 and the freezing evaporator 9 is merged and then enters the suction port of the compressor 1 again.

[0075] As one of the optional embodiments, the mixed refrigerant is made of R290 refrigerant and R600a refrigerant; the mixed refrigerant sequentially passes through the compressor 1 and the condenser 2, and then enters the gas-liquid separator 3 for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0076] Specifically, the mixed refrigerant is preferably made of R290 refrigerant and R600a refrigerant. The mixed refrigerant sequentially passes through the compressor 1 and the condenser 2, and then enters the gas-liquid separator 3 for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0077] Please refer to Figure 10 , Figure 10 is a flowchart of a refrigerator refrigeration control method provided by an embodiment of the present application. The refrigerator refrigeration control method provided by the embodiment of the present application is applied to a refrigerator comprising a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a secondary cooler, an electromagnetic valve, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator; the discharge port of the compressor is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the gas-liquid separator; the gas-liquid separator is used for separating the mixed refrigerant, the gaseous outlet end of the gas-liquid separator is connected to the inlet of the secondary cooler, and the liquid outlet end of the gas-liquid separator is connected to the inlet of the electric valve; the outlet of the secondary cooler is connected to the freezing evaporator through the electromagnetic valve; the electric valve is used for dividing the liquid refrigerant separated by the gas-liquid separator into three paths and entering different refrigeration pipelines respectively, and the refrigerator refrigeration control method comprises the following steps:

[0078] S1, when the refrigerator operates in a normal refrigeration mode, the electromagnetic valve is controlled to be in a closed state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator respectively through the electric valve for refrigeration; and the separated gaseous refrigerant is stored in the secondary cooler and is subjected to secondary cooling;

[0079] S2, when the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator and the variable-temperature evaporator for refrigeration through the electric valve respectively; and the separated gaseous refrigerant enters the freezing evaporator for refrigeration through the electromagnetic valve after being secondarily cooled by the secondary cooler.

[0080] In the process of refrigeration by using the mixed refrigerant, the embodiment of the application selects different refrigerants in the system to perform refrigeration according to different refrigeration temperatures, and effectively utilizes the advantages of different refrigerants. When the refrigerator operates in the normal refrigeration mode, the mixed refrigerant is no longer used for refrigeration, and the R290 refrigerant is stored, and only the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art, and the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in the deep cooling refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, and therefore the R290 refrigerant can be used for refrigeration in the freezing chamber of the refrigerator, and the R600a refrigerant is still used for refrigeration in other chambers of the refrigerator. In the refrigeration process, the suction and discharge side compression ratio of the compressor is smaller than that of the single refrigerant used in other products, and the efficiency is higher. In addition, because the compression ratio is small, the vibration generated by the compressor during operation is small, and the noise of the refrigerator during the whole refrigeration process is low.

[0081] As one of the optional embodiments, the refrigeration pipeline comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline;

[0082] The first refrigeration pipeline is connected with the first outlet of the electric valve, and enters the suction port of the compressor after passing through the first capillary tube and the refrigeration evaporator;

[0083] The second refrigeration pipeline is connected with the second outlet of the electric valve, and enters the suction port of the compressor after passing through the second capillary tube and the variable-temperature evaporator;

[0084] The third refrigeration pipeline is connected with the third outlet of the electric valve, and enters the suction port of the compressor after passing through the third capillary tube and the freezing evaporator.

[0085] Specifically, the electric valve in the embodiment of the present application is used to divide the liquid refrigerant separated by the gas-liquid separator into three paths, which respectively enter different refrigeration pipelines. The refrigeration pipelines include a first refrigeration pipeline A, a second refrigeration pipeline B and a third refrigeration pipeline C. The first refrigeration pipeline is connected with the first outlet of the electric valve, and enters the suction port of the compressor after passing through the first capillary tube and the refrigeration evaporator. The second refrigeration pipeline is connected with the second outlet of the electric valve, and enters the suction port of the compressor after passing through the second capillary tube and the variable-temperature evaporator. The third refrigeration pipeline is connected with the third outlet of the electric valve, and enters the suction port of the compressor after passing through the third capillary tube and the freezing evaporator.

[0086] As one of the optional embodiments, the electromagnetic valve is connected with the inlet of the third capillary tube, and the outlet of the third capillary tube is connected with the freezing evaporator.

[0087] When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is in the closed state, and the first outlet, the second outlet and the third outlet of the electric valve are all in the open state.

[0088] When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve is in the open state, the first outlet and the second outlet of the electric valve are in the open state, and the third outlet is in the closed state.

[0089] Specifically, in the embodiment of the present application, the electromagnetic valve is connected with the inlet of the third capillary tube, and the outlet of the third capillary tube is connected with the refrigeration evaporator. When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is in the closed state, and the first outlet, the second outlet and the third outlet of the electric valve are all in the open state. Since the electromagnetic valve is in the closed state, the separated gaseous refrigerant R290 is stored in the upper part of the gas-liquid separator, and the liquid refrigerant R600a in the bottom part enters the inlet of the electric valve, is divided into three paths A, B and C, respectively passes through the capillary tubes, and enters the refrigeration evaporator, the variable-temperature evaporator and the refrigeration evaporator respectively to perform evaporation and heat absorption in different evaporators, thereby cooling different compartments, and finally converges together and returns to the suction port of the right side of the compressor. When the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve is in the open state, and the first outlet and the second outlet of the electric valve are in the open state, and the third outlet is in the closed state. Since the electromagnetic valve is in the open state, the separated gaseous refrigerant R290 passes through the upper part of the gas-liquid separator, and then flows along the upper pipeline to the secondary cooler. At this time, the refrigerant can continue to flow, and the secondary cooler is close to the refrigeration evaporator, so that the secondary cooling can be performed. At this time, the cooled R290 refrigerant changes from gas to liquid. The liquid R290 refrigerant enters the capillary tube through the electromagnetic valve, and then enters the refrigeration evaporator to cool the refrigeration compartment. The liquid refrigerant R600a in the bottom part enters the inlet of the electric valve, is divided into two paths A and B, respectively passes through the capillary tubes, and enters the refrigeration evaporator and the variable-temperature evaporator respectively to perform evaporation and heat absorption in different evaporators, thereby cooling different compartments, and finally converges together and returns to the suction port of the right side of the compressor.

[0090] As one of the optional embodiments, the outlet of the refrigeration evaporator, the outlet of the variable-temperature evaporator and the outlet of the refrigeration evaporator are all connected with the suction port of the compressor; and the refrigerant converges together after passing through the refrigeration evaporator, the variable-temperature evaporator and the refrigeration evaporator, and then enters the suction port of the compressor again.

[0091] Specifically, in the embodiment of the present application, the outlet of the refrigeration evaporator, the outlet of the variable-temperature evaporator and the outlet of the refrigeration evaporator are all connected with the suction port of the compressor, and the refrigerant converges together after passing through the refrigeration evaporator, the variable-temperature evaporator and the refrigeration evaporator, and then enters the suction port of the compressor again.

[0092] As one of the optional embodiments, the mixed refrigerant is made of R290 refrigerant and R600a refrigerant; and the mixed refrigerant sequentially passes through the compressor and the condenser, enters the gas-liquid separator for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0093] Specifically, the mixed refrigerant in the embodiment of the present application is preferably made by mixing R290 refrigerant and R600a refrigerant. After sequentially passing through the compressor and the condenser, the mixed refrigerant enters the gas-liquid separator for separation. The separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0094] The embodiment of the present application provides a refrigerator and a refrigeration control method thereof. For a three-system refrigerator, in the process of refrigeration using mixed refrigerant, different refrigerants inside the system are selected for refrigeration according to different set refrigeration temperatures, and the advantages of different refrigerants are effectively utilized. When the refrigerator operates in a normal refrigeration mode, the mixed refrigerant is no longer used for refrigeration, but the R290 refrigerant is stored, and only the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art solution, the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in a deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, and therefore the refrigerator freezing chamber can use the R290 refrigerant for refrigeration, and the other chambers of the refrigerator still use the R600a refrigerant for refrigeration. In the refrigeration process at this time, the suction and discharge side compression ratio of the compressor is smaller than that of other products using single refrigerant, and the efficiency is higher. Moreover, because the compression ratio is small, the vibration generated by the compressor during operation is small, and the noise of the refrigerator during the overall refrigeration process is low.

[0095] It should be noted that the system embodiments described above are only schematic, and the units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e., they can be located in one place or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the embodiment of the present application according to actual needs. In addition, the connection relationship between the modules in the system embodiment provided by the present application indicates that there is a communication connection between them, which can be implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0096] The above describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A refrigerator, characterized in that, include: The cabinet, which serves as the supporting structure of the refrigerator, has several compartments inside; The refrigeration system, located inside the enclosure, includes a compressor, a condenser, a gas-liquid separator, a secondary cooler, a solenoid valve, an electric valve, a refrigerated evaporator, a variable-temperature evaporator, and a frozen evaporator. The compressor's exhaust port is connected to the condenser's inlet, and the condenser's outlet is connected to the gas-liquid separator's inlet; the gas-liquid separator is used to separate the mixed refrigerant, and the gas outlet of the gas-liquid separator is connected to the inlet of the secondary cooler, while the liquid outlet of the gas-liquid separator is connected to the inlet of the electric valve. The outlet of the secondary cooler is connected to the refrigeration evaporator via the solenoid valve; the electric valve is used to divide the liquid refrigerant after separation by the gas-liquid separator into three paths, which enter different refrigeration pipelines respectively. The controller is configured to keep the solenoid valve closed when the refrigerator is running in normal cooling mode; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator, the variable temperature evaporator, and the freezing evaporator through the electric valve for cooling; the separated gaseous refrigerant is stored in the secondary cooler for secondary cooling; When the refrigerator is running in deep cooling mode, the solenoid valve is in the open state; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator and the variable temperature evaporator respectively through the electric valve for cooling; the separated gaseous refrigerant is cooled a second time by the secondary cooler and then enters the freezing evaporator through the solenoid valve for cooling.

2. The refrigerator as described in claim 1, characterized in that, The refrigeration piping includes a first refrigeration piping, a second refrigeration piping, and a third refrigeration piping; The first refrigeration pipeline is connected to the first outlet of the electric valve, and after passing through the first capillary tube and the refrigeration evaporator, it enters the suction port of the compressor; The second refrigeration pipeline is connected to the second outlet of the electric valve, and after passing through the second capillary tube and the variable temperature evaporator, it enters the suction port of the compressor; The third refrigeration pipeline is connected to the third outlet of the electric valve, and after passing through the third capillary tube and the refrigeration evaporator, it enters the suction port of the compressor.

3. The refrigerator as described in claim 2, characterized in that, The solenoid valve is connected to the inlet of the third capillary tube, and the outlet of the third capillary tube is connected to the refrigeration evaporator. When the refrigerator is running in normal cooling mode, the solenoid valve is in the closed state, and the first outlet, second outlet and third outlet of the electric valve are all in the open state; When the refrigerator is running in deep cooling mode, the solenoid valve is in the open state, the first and second outlets of the electric valve are in the open state, and the third outlet is in the closed state.

4. The refrigerator as described in claim 3, characterized in that, The outlets of the refrigerated evaporator, the variable-temperature evaporator, and the freezer evaporator are all connected to the suction port of the compressor. After passing through the refrigerated evaporator, the variable-temperature evaporator, and the freezer evaporator, the refrigerant is combined and then introduced into the suction port of the compressor.

5. The refrigerator as described in claim 4, characterized in that, The mixed refrigerant is made by mixing R290 refrigerant and R600a refrigerant; after passing through the compressor and the condenser in sequence, the mixed refrigerant enters the gas-liquid separator for separation. The separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

6. A refrigerator cooling control method, characterized in that, The method is applied to a refrigerator including a cabinet and a refrigeration system; wherein, the cabinet has several compartments, and the refrigeration system includes a compressor, a condenser, a gas-liquid separator, a secondary cooler, a solenoid valve, an electric valve, a refrigeration evaporator, a variable-temperature evaporator, and a freezing evaporator; the gas-liquid separator is used to separate the mixed refrigerant, the gas outlet of the gas-liquid separator is connected to the inlet of the secondary cooler, and the liquid outlet of the gas-liquid separator is connected to the inlet of the electric valve; the outlet of the secondary cooler is connected to the freezing evaporator through the solenoid valve; the electric valve is used to divide the liquid refrigerant after separation by the gas-liquid separator into three paths, which enter different refrigeration pipelines respectively, and the refrigerator refrigeration control method includes: When the refrigerator is running in normal cooling mode, the solenoid valve is closed; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator, the variable temperature evaporator, and the freezing evaporator through the electric valve for cooling; the separated gaseous refrigerant is stored in the secondary cooler for secondary cooling; When the refrigerator is running in deep cooling mode, the solenoid valve is in the open state; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the refrigeration evaporator and the variable temperature evaporator respectively through the electric valve for cooling; the separated gaseous refrigerant is cooled a second time by the secondary cooler and then enters the freezing evaporator through the solenoid valve for cooling.

7. The refrigerator cooling control method as described in claim 6, characterized in that, The refrigeration piping includes a first refrigeration piping, a second refrigeration piping, and a third refrigeration piping; The first refrigeration pipeline is connected to the first outlet of the electric valve, and after passing through the first capillary tube and the refrigeration evaporator, it enters the suction port of the compressor; The second refrigeration pipeline is connected to the second outlet of the electric valve, and after passing through the second capillary tube and the variable temperature evaporator, it enters the suction port of the compressor; The third refrigeration pipeline is connected to the third outlet of the electric valve, and after passing through the third capillary tube and the refrigeration evaporator, it enters the suction port of the compressor.

8. The refrigerator cooling control method as described in claim 7, characterized in that, The solenoid valve is connected to the inlet of the third capillary tube, and the outlet of the third capillary tube is connected to the refrigeration evaporator. When the refrigerator is running in normal cooling mode, the solenoid valve is in the closed state, and the first outlet, second outlet and third outlet of the electric valve are all in the open state; When the refrigerator is running in deep cooling mode, the solenoid valve is in the open state, the first and second outlets of the electric valve are in the open state, and the third outlet is in the closed state.

9. The refrigerator cooling control method as described in claim 8, characterized in that, The outlets of the refrigerated evaporator, the variable-temperature evaporator, and the freezer evaporator are all connected to the suction port of the compressor. After passing through the refrigerated evaporator, the variable-temperature evaporator, and the freezer evaporator, the refrigerant is combined and then introduced into the suction port of the compressor.

10. The refrigerator cooling control method as described in claim 9, characterized in that, The mixed refrigerant is made by mixing R290 refrigerant and R600a refrigerant; after passing through the compressor and the condenser in sequence, the mixed refrigerant enters the gas-liquid separator for separation. The separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

Images