Refrigerator refrigerating system, refrigerator and refrigerating method thereof

Abstract

The invention provides a refrigerator refrigerating system, a refrigerator and a refrigerating method of the refrigerator. The refrigerator refrigerating system comprises an evaporator, a first compressor, a second compressor, a condenser, a capillary tube and an electromagnetic valve. The evaporators comprise a refrigeration evaporator and a freezing evaporator; the electromagnetic valve comprises an air inlet, a first air outlet and a second air outlet; when the refrigerating state of the refrigerating chamber is an open state, the first compressor is started, the second compressor is closed, the first air outlet is opened, and the second air outlet is closed; and when the refrigerating state of the freezing chamber is an open state, the second compressor is started, the first compressor is closed, the first air outlet is closed, and the second air outlet is opened. When the refrigerating chamber needs to refrigerate, the first compressor is started, the second compressor is stopped, when the freezing chamber needs to refrigerate, the first compressor is stopped, and the second compressor is started, so that the compressors with different refrigerating capacities are used according to the refrigerating requirements of the refrigerator, the overall energy saving of the refrigerator is realized, and the problem that the energy consumption is relatively high when the freezing chamber of the dual-circulation refrigerator independently refrigerates is solved.

Description

Technical Field

[0001] The present application relates to the technical field of refrigeration equipment, and in particular to a refrigerator refrigeration system, a refrigerator and a refrigeration method thereof. Background Art

[0002] The refrigeration system of a refrigerator usually consists of an evaporator, a compressor, a condenser, an anti-condensation tube, a filter, and a capillary tube, etc. For refrigerators that require independent temperature control of the refrigeration compartment and the freezer compartment, the evaporators of each compartment usually adopt a series refrigeration method, that is, the refrigeration evaporator and the freezing evaporator are connected in series, and a capillary tube is connected to the inlet of the refrigeration evaporator and the freezing evaporator. The two capillaries control the refrigerant flow direction through an electromagnetic rotary valve to achieve independent refrigeration of the refrigeration compartment or the freezer compartment.

[0003] However, for a dual-circulation refrigerator using a series refrigeration system, the refrigeration capacity of the compressor is selected according to the maximum heat load when the refrigerator is in refrigeration operation, that is, the refrigeration capacity of the compressor meets the needs of refrigerating both the refrigerated compartment and the freezer compartment at the same time. However, for a dual-circulation refrigerator, since the refrigeration capacity required by the refrigerated compartment is greater than that of the refrigerated compartment, that is, the refrigeration time for the refrigerated compartment to reach the temperature target is less than the refrigeration time for the freezer compartment to reach the temperature target. After the refrigeration of the refrigerated compartment stops, the refrigerant is switched to the capillary tube of the freezer compartment through the rotary solenoid valve to continue refrigeration. Since the refrigeration capacity of the compressor is much greater than that required by the freezer compartment, the compressor cannot fully operate in the optimal working condition, and the energy consumption of the freezer compartment is high when it is independently refrigerated. Summary of the invention

[0004] The present application provides a refrigerator refrigeration system, a refrigerator and a refrigeration method thereof, so as to solve the problem of high energy consumption when the freezer compartment of a dual-circulation refrigerator is independently refrigerated.

[0005] In a first aspect, the present application provides a refrigerator refrigeration system, comprising: an evaporator, a first compressor, a second compressor, a condenser, a capillary tube, and a solenoid valve;

[0006] The evaporator includes a refrigerating evaporator and a freezing evaporator. The refrigerating evaporator is connected to the inlet of the freezing evaporator. The return air pipe of the freezing evaporator is respectively connected to the suction pipe of the first compressor and the suction pipe of the second compressor.

[0007] The first compressor is connected to the condenser through an exhaust pipe; the second compressor is connected to the condenser through an exhaust pipe;

[0008] The solenoid valve comprises an air inlet, a first air outlet and a second air outlet; the air inlet is connected to the condenser; the capillary tube comprises a refrigeration capillary tube and a freezing capillary tube; the first air outlet is connected to the inlet of the refrigeration evaporator through the refrigeration capillary tube; the second air outlet is connected to the inlet of the freezing evaporator through the freezing capillary tube;

[0009] Wherein, when the refrigeration state of the refrigerating chamber is on, the first compressor is started, the second compressor is turned off, the first air outlet is opened, and the second air outlet is closed;

[0010] When the refrigeration state of the freezer compartment is the on state, the second compressor is started, the first compressor is turned off, the first air outlet is closed, and the second air outlet is opened.

[0011] Optionally, when the first air outlet is connected to the air inlet, the second air outlet is closed; when the second air outlet is connected to the air inlet, the first air outlet is closed.

[0012] Optionally, the cooling capacity of the first compressor is a first cooling capacity, the cooling capacity of the second compressor is a second cooling capacity, and a ratio of the first cooling capacity to the second cooling capacity is 1.5:1-1.9:1.

[0013] Optionally, when the cold storage chamber is refrigerated, the refrigerant flows through the first compressor, the condenser, the solenoid valve, the first air outlet, the refrigeration capillary, the refrigeration evaporator, and the freezing evaporator in sequence.

[0014] Optionally, when the freezer compartment is refrigerated, the refrigerant flows through the second compressor, the condenser, the solenoid valve, the second air outlet, the freezing capillary tube, and the freezing evaporator in sequence.

[0015] Optionally, when the working state of the first compressor is a start state, the working state of the second compressor is a stop state; when the working state of the second compressor is a start state, the working state of the first compressor is a stop state.

[0016] In a second aspect, the present application provides a refrigerator, comprising the refrigerator refrigeration system, a cold storage chamber and a freezer chamber as described in the first aspect above; the refrigerator refrigeration system provides cold to the cold storage chamber and the freezer chamber respectively.

[0017] In a third aspect, the present application provides a refrigerator refrigeration method, which is applied to the refrigerator refrigeration system described in the first aspect, comprising:

[0018] Get the refrigeration status of the refrigerator and freezer;

[0019] If the refrigeration state of the refrigerator compartment is on, the first compressor is controlled to start, the second compressor is controlled to stop, the first air outlet is controlled to open, and the second air outlet is controlled to close;

[0020] If the refrigeration state of the freezer compartment is on, the second compressor is controlled to start, the first compressor is controlled to stop, the first air outlet is controlled to close, and the second air outlet is controlled to open.

[0021] It can be seen from the above technical scheme that the present application provides a refrigerator refrigeration system, a refrigerator and a refrigeration method thereof, including: an evaporator, a first compressor, a second compressor, a condenser, a capillary tube, and a solenoid valve; the evaporator includes a refrigeration evaporator and a freezing evaporator, the refrigeration evaporator is connected to the inlet of the freezing evaporator, and the return air pipe of the freezing evaporator is respectively connected to the suction pipe of the first compressor and the suction pipe of the second compressor. The first compressor is connected to the condenser through an exhaust pipe; the second compressor is connected to the condenser through an exhaust pipe; the solenoid valve includes an air inlet, a first air outlet and a second air outlet; the air inlet is connected to the condenser; the capillary tube includes a refrigeration capillary tube and a freezing capillary tube; the first air outlet is connected to the inlet of the refrigeration evaporator through the refrigeration capillary tube; the second air outlet is connected to the inlet of the freezing evaporator through the freezing capillary tube; wherein, when the refrigeration state of the refrigerating chamber is in the on state, the first compressor is started, the second compressor is turned off, the first air outlet is opened, and the second air outlet is closed; when the refrigeration state of the freezing chamber is in the on state, the second compressor is started, the first compressor is turned off, the first air outlet is closed, and the second air outlet is opened. By controlling the opening and closing states of the two outlets of the solenoid valve and combining the refrigeration requirements of the refrigerator and freezer, different cooling paths are used. When the refrigerator needs to be refrigerated, the first compressor is started and the second compressor is turned off. When the freezer needs to be refrigerated, the first compressor is turned off and the second compressor is started. By using compressors with different refrigeration capacities according to the refrigeration requirements of the refrigerator, overall energy saving of the refrigerator is achieved, so as to solve the problem of high energy consumption when the freezer compartment of a dual-circulation refrigerator is independently refrigerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 A schematic diagram of a dual-circulation refrigerator refrigeration system provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of a refrigerator refrigeration system provided in an embodiment of the present application.

[0025] Reference numerals:

[0026] Among them, 11-first compressor; 12-second compressor; 2-condenser; 3-solenoid valve; 31-first air outlet; 32-second air outlet; 41-refrigeration capillary; 42-freezing capillary; 51-refrigeration evaporator; 52-freezing evaporator; 6-return air pipe. DETAILED DESCRIPTION

[0027] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0028] The refrigeration system of a refrigerator usually consists of an evaporator, a compressor, a condenser, an anti-condensation tube, a filter, and a capillary tube, etc. For refrigerators that require independent temperature control of the refrigeration compartment and the freezer compartment, the evaporators of each compartment usually adopt a series refrigeration method, that is, the refrigeration evaporator and the freezing evaporator are connected in series, and a capillary tube is connected to the inlet of the refrigeration evaporator and the freezing evaporator. The two capillaries control the refrigerant flow direction through an electromagnetic rotary valve to achieve independent refrigeration of the refrigeration compartment or the freezer compartment.

[0029] Specifically, by Figure 1 It can be seen that Figure 1 It is a schematic diagram of the refrigeration system of a double-circulation refrigerator, wherein the refrigeration system is composed of a refrigerating evaporator 51, a freezing evaporator 52, a compressor 1, a condenser 2, a refrigerating capillary tube 41, a freezing capillary tube 42 and a solenoid valve 3.

[0030] The exhaust pipe of the compressor 1 is connected to the condenser 2 , and the return air pipe 6 of the compressor 1 is connected to the outlet of the refrigeration evaporator 52 .

[0031] The solenoid valve 3 is used to control the flow direction of the capillary. The solenoid valve 3 is a refrigeration component with one inlet and two outlets. Its inlet is connected to the outlet of the condenser 2. The outlet of the rotating solenoid valve 3 is respectively connected to the refrigeration capillary 41 and the freezing capillary 42. During the refrigeration operation, only one of the two outlets of the solenoid valve 3 can be opened, that is, the refrigerant can only enter the refrigeration evaporator 51 or the freezing evaporator 52.

[0032] The refrigeration evaporator 51 is connected in series with the freezing evaporator 52. The outlet of the refrigeration evaporator 51 is connected to the inlet of the freezing evaporator 52. The refrigerant passing through the refrigeration capillary tube 41 evaporates and cools in the refrigeration evaporator 51, and the excess refrigerant continues to enter the freezing evaporator 52 for evaporation and cooling.

[0033] The outlet of the refrigeration evaporator 52 is connected to the return air pipe 6, and the return air pipe 6 is connected to the suction pipe of the compressor.

[0034] During the refrigeration process of the refrigerator, the opening and closing states of the two outlets of the solenoid valve 3 are controlled according to the refrigeration operation requirements of the refrigerator refrigerating compartment or the freezing compartment, thereby achieving different flow directions of the refrigerant; the compressor performs refrigeration operation according to the refrigerating demand of the refrigerating compartment or the freezing compartment.

[0035] However, in a dual-circulation refrigerator using a series refrigeration system, the refrigeration capacity of the compressor 1 is selected according to the maximum heat load when the refrigerator is in refrigeration operation, that is, the refrigeration capacity of the compressor 1 meets the needs of refrigerating the refrigerated compartment and the freezer compartment at the same time. In a dual-circulation refrigerator, since the refrigeration capacity required by the freezer compartment is greater than that of the refrigerated compartment, that is, the refrigeration time for the refrigerated compartment to reach the temperature target is less than the refrigeration time for the freezer compartment to reach the temperature target. After the refrigeration of the refrigerated compartment stops, the refrigerant switches to the capillary tube of the freezer compartment through the rotary solenoid valve 3 to continue refrigeration. Since the refrigeration capacity of the compressor 1 is much greater than the refrigeration capacity required by the freezer compartment, the compressor cannot fully operate in the optimal working condition, and the energy consumption of the freezer compartment is high when refrigerating independently.

[0036] To solve the problem of high energy consumption when the freezer compartment of a dual-circulation refrigerator is independently refrigerated, see Figure 2 An embodiment of the present application provides a refrigerator refrigeration system, including: an evaporator, a first compressor 11, a second compressor 12, a condenser 2, a capillary tube, and a solenoid valve 3.

[0037] The evaporator includes a refrigeration evaporator 51 and a freezing evaporator 52. The refrigeration evaporator 51 is connected to the inlet of the freezing evaporator 52. The return air pipe 6 of the freezing evaporator 52 is connected to the suction pipe of the first compressor 11 and the suction pipe of the second compressor 12 respectively.

[0038] The first compressor 11 is connected to the condenser 2 through an exhaust pipe; the second compressor 12 is connected to the condenser 2 through an exhaust pipe;

[0039] The solenoid valve 3 includes an air inlet, a first air outlet 31 and a second air outlet 32; the air inlet is connected to the condenser 2; the capillary tube includes a refrigeration capillary tube 41 and a freezing capillary tube 42; the first air outlet 31 is connected to the inlet of the refrigeration evaporator 51 through the refrigeration capillary tube 41; the second air outlet 32 ​​is connected to the inlet of the freezing evaporator 52 through the freezing capillary tube 42.

[0040] When the refrigeration state of the refrigerating chamber is in the on state, the first compressor 11 is started, the second compressor 12 is turned off, the first air outlet 31 is opened, and the second air outlet 32 ​​is closed.

[0041] When the refrigeration state of the freezer compartment is the on state, the second compressor 12 is started, the first compressor 11 is turned off, the first air outlet 31 is closed, and the second air outlet 32 ​​is opened.

[0042] Specifically, based on the dual-circulation refrigerator refrigeration system, the present application keeps the refrigeration components such as the refrigeration evaporator 5151, the freezing evaporator 5252, the compressor, the condenser 2, the refrigeration capillary 41, the freezing capillary 42 and the solenoid valve 3 unchanged, and adds a compressor.

[0043] The first compressor 11 and the second compressor 12 are connected in parallel, the exhaust pipes of the two compressors are connected to the condenser 22 , and the return air pipes 6 of the two compressors are connected to the outlet of the refrigeration evaporator 52 .

[0044] During the refrigeration process of the refrigerator, according to the needs of the refrigeration operation of the refrigerator's refrigerating compartment or freezing compartment, the opening and closing states of the first air outlet 31 and the second air outlet 32 ​​of the rotary solenoid valve 3 are controlled to achieve different flow directions of the refrigerant; when the refrigerating compartment needs to be refrigerated, the first compressor 11 is started to refrigerate the refrigerating compartment and the freezing compartment at the same time; when the refrigerating compartment does not need to be refrigerated and the freezing compartment is refrigerated, the second compressor 12 is started to refrigerate the freezing compartment alone through the second compressor 12, so that the second compressor 12 with lower energy consumption is used to reduce energy consumption.

[0045] In some embodiments, when the first air outlet 31 is connected to the air inlet, the second air outlet 32 ​​is closed; when the second air outlet 32 ​​is connected to the air inlet, the first air outlet 31 is closed. The solenoid valve 3 is a solenoid valve 3 with one inlet and two outlets, which is used to control the flow direction of the refrigerant. When working, the solenoid valve 3 controls the refrigerant by moving the internal valve core between different positions. When the valve is in a closed state, the air inlet is not connected to the two air outlets; when the valve is open, the inlet can be connected to the first air outlet 31 or the second air outlet 32, depending on the position of the valve core.

[0046] The use of the solenoid valve 3 with one inlet and two outlets can provide flexible refrigerant control options, allowing the refrigerator refrigeration system to adjust the flow path of the refrigerant according to actual needs.

[0047] In some embodiments, the cooling capacity of the first compressor 11 is a first cooling capacity, the cooling capacity of the second compressor 12 is a second cooling capacity, and the ratio of the first cooling capacity to the second cooling capacity is 1:0.5-1:0.9.

[0048] Among them, the first compressor 11 needs to provide cooling capacity for the refrigerated compartment while providing cooling capacity for the freezer compartment. When the second compressor 12 provides cooling capacity for the freezer compartment, it does not need to provide cooling for the refrigerated compartment. Therefore, the cooling capacity of the first compressor 11 is greater than the cooling capacity of the second compressor 12. Therefore, when designing the refrigerator refrigeration system, it is important to select a suitable cooling capacity ratio, which directly affects the energy efficiency and performance of the refrigeration system. If the cooling capacity of the first compressor 11 is too large, it may cause energy waste; if it is too small, it may not be able to meet the refrigeration demand of the freezer compartment. Therefore, selecting a reasonable ratio range can ensure that the low temperature demand of the freezer compartment can be met while maintaining the energy efficiency of the overall system. Therefore, in the embodiment of the present application, the cooling capacity of the second compressor 12 is set to 0.5-0.9 times the cooling capacity of the first compressor 11. When the refrigerated compartment needs to be refrigerated, the first compressor 11 is started to cool the refrigerated compartment and the freezer compartment at the same time. When the refrigerated compartment does not need to be refrigerated and the freezer compartment is refrigerated, the second compressor 12 is started to cool the freezer compartment alone through the second compressor 12, so that the second compressor 12 with lower energy consumption can be used to reduce energy consumption.

[0049] In some embodiments, when the refrigerating chamber is refrigerated, the refrigerant flows through the first compressor 11, the condenser 2, the solenoid valve 3, the first air outlet 31, the refrigerating capillary 41, the refrigerating evaporator 51, and the freezing evaporator 52 in sequence.

[0050] Specifically, after the first compressor 11 is started, it starts to compress the refrigerant. The compressed high-temperature and high-pressure refrigerant enters the condenser 2, releases heat and condenses into a liquid state. The liquid refrigerant passes through the solenoid valve 3, and at this time, the solenoid valve 3 is configured so that the first air outlet 31 is opened and the second air outlet 32 ​​is closed. After the refrigerant flows out through the first air outlet 31, it passes through the refrigeration capillary 41, so that the pressure of the refrigerant is reduced, and at the same time, the temperature of the refrigerant is reduced, thereby obtaining a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the refrigeration evaporator 51, absorbs the heat in the refrigeration room, and cools the refrigeration room. The remaining refrigerant flows out of the refrigeration evaporator 51 and further flows to the freezing evaporator 52 to continue to absorb the heat in the freezing room.

[0051] In some embodiments, when the freezer compartment is refrigerated, the refrigerant flows through the second compressor 12 , the condenser 2 , the solenoid valve 3 , the second air outlet 32 ​​, the freezing capillary tube 42 , and the freezing evaporator 52 in sequence.

[0052] Specifically, after the second compressor 12 is started, it begins to compress the refrigerant. The compressed high-temperature and high-pressure refrigerant enters the condenser 2, releases heat and condenses into a liquid state. The liquid refrigerant passes through the solenoid valve 3. At this time, the solenoid valve 3 is configured so that the second air outlet 32 ​​is open and the first air outlet 31 is closed. After the refrigerant flows out through the first air outlet 31, it passes through the freezing capillary 42, which reduces the pressure of the refrigerant and reduces the temperature of the refrigerant, thereby obtaining a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant enters the freezing evaporator 52, absorbs the heat in the freezing chamber, and cools the freezing chamber. By setting different flow paths for the refrigerant, when the freezing chamber needs to be refrigerated, the second compressor 12 with lower energy consumption is used to reduce energy consumption.

[0053] In some embodiments, when the working state of the first compressor 11 is the start state, the working state of the second compressor 12 is the stop state; when the working state of the second compressor 12 is the start state, the working state of the first compressor 11 is the stop state. The working states of the first compressor 11 and the second compressor 12 are mutually exclusive. Specifically, when the refrigerator compartment needs to be refrigerated, the first compressor 11 with a larger refrigeration capacity is started to provide cooling for the refrigerator compartment and the freezer compartment. When the freezer compartment needs to be refrigerated, only the second compressor 12 with a smaller refrigeration capacity is started to provide cooling for the freezer compartment. By providing cooling for the freezer compartment alone, the first compressor 11 with a larger energy consumption is turned off, and the second compressor 12 with a smaller energy consumption is started to reduce energy consumption.

[0054] In some embodiments, the embodiments of the present application provide a refrigerator, including the refrigerator refrigeration system, the refrigerator compartment and the freezer compartment provided in the above embodiments; the refrigerator refrigeration system supplies cold to the refrigerator compartment and the freezer compartment respectively. The refrigerator refrigeration system can control the working state of the first compressor 11 and the second compressor 12 according to the refrigeration requirements of the refrigerator compartment and the freezer compartment, and then control the opening of the solenoid valve according to the working state of the first compressor 11 and the second compressor 12, so as to control the opening and closing of the first air outlet or the second air outlet according to the specific situation, so as to ensure that the refrigerator meets the refrigeration requirements while the energy consumption of the refrigeration system is minimized during operation.

[0055] In some embodiments, an embodiment of the present application provides a refrigerator refrigeration method, which is applied to the dual-compressor refrigerator provided in the above embodiment, including: obtaining the refrigeration status of the refrigeration chamber and the freezer chamber.

[0056] If the refrigeration state of the refrigerating chamber is in the on state, the first compressor 11 is controlled to start, the second compressor 12 is controlled to stop, the first air outlet 31 is controlled to open, and the second air outlet 32 ​​is controlled to close.

[0057] If the refrigeration state of the freezer compartment is in the on state, the second compressor 12 is controlled to start, the first compressor 11 is controlled to stop, the first air outlet 31 is controlled to close, and the second air outlet 32 ​​is controlled to open.

[0058] It can be seen from the above technical scheme that the present application provides a refrigerator refrigeration system, a refrigerator and a refrigeration method thereof, the refrigerator refrigeration system comprising: an evaporator, a first compressor 11, a second compressor 12, a condenser 2, a capillary tube, and a solenoid valve 3; the evaporator comprises a refrigeration evaporator 51 and a freezing evaporator 52, the refrigeration evaporator 51 is connected to the inlet of the freezing evaporator 52, and the return air pipe 6 of the freezing evaporator 52 is respectively connected to the suction pipe of the first compressor 11 and the suction pipe of the second compressor 12. The first compressor 11 is connected to the condenser 2 through an exhaust pipe; the second compressor 12 is connected to the condenser 2 through an exhaust pipe; the solenoid valve 3 includes an air inlet, a first air outlet 31 and a second air outlet 32; the air inlet is connected to the condenser 2; the capillary tube includes a refrigeration capillary tube 41 and a freezing capillary tube 42; the first air outlet 31 is connected to the inlet of the refrigeration evaporator 51 through the refrigeration capillary tube 41; the second air outlet 32 ​​is connected to the inlet of the freezing evaporator 52 through the freezing capillary tube 42; wherein, when the refrigeration state of the refrigerating chamber is in the on state, the first compressor 11 is started, the second compressor 12 is turned off, the first air outlet 31 is opened, and the second air outlet 32 ​​is closed; when the refrigeration state of the freezing chamber is in the on state, the second compressor 12 is started, the first compressor 11 is turned off, the first air outlet 31 is closed, and the second air outlet 32 ​​is opened. By controlling the opening and closing states of the two outlets of the solenoid valve 3 and combining the refrigeration requirements of the refrigerator and freezer compartments, different cooling paths are used. When the refrigerator compartment needs to be refrigerated, the first compressor 11 is started and the second compressor 12 is turned off. When the freezer compartment needs to be refrigerated, the first compressor 11 is turned off and the second compressor 12 is started. By using compressors with different refrigeration capacities according to the refrigeration requirements of the refrigerator, overall energy saving of the refrigerator is achieved, so as to solve the problem of high energy consumption when the freezer compartment of the dual-circulation refrigerator is independently refrigerated.

[0059] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A refrigerator refrigeration system, characterized in that: include: An evaporator, a first compressor (11), a second compressor (12), a condenser (2), a capillary tube, and a solenoid valve (3); The evaporator comprises a refrigerating evaporator (51) and a freezing evaporator (52); the refrigerating evaporator (51) is connected to an inlet of the freezing evaporator (52); and a return air pipe (61) of the freezing evaporator (52) is respectively connected to an air intake pipe of the first compressor (11) and an air intake pipe of the second compressor (12); The first compressor (11) is connected to the condenser (2) via an exhaust pipe; the second compressor (12) is connected to the condenser (2) via an exhaust pipe; The solenoid valve (3) comprises an air inlet, a first air outlet (31) and a second air outlet (32); the air inlet is connected to the condenser (2); the capillary tube comprises a refrigeration capillary tube (41) and a freezing capillary tube (42); the first air outlet (31) is connected to the inlet of the refrigeration evaporator (51) through the refrigeration capillary tube (41); the second air outlet (32) is connected to the inlet of the freezing evaporator (52) through the freezing capillary tube (42); Wherein, when the refrigeration state of the refrigerating chamber is in the on state, the first compressor (11) is started, the second compressor (12) is turned off, the first air outlet (31) is opened, and the second air outlet (32) is closed; If the refrigeration state of the freezer compartment is in the on state, the second compressor (12) is started, the first compressor (11) is turned off, the first air outlet (31) is closed, and the second air outlet (32) is opened.

2. The refrigerator refrigeration system according to claim 1, characterized in that: When the first air outlet (31) is connected to the air inlet, the second air outlet (32) is closed; when the second air outlet (32) is connected to the air inlet, the first air outlet (31) is closed.

3. The refrigerator refrigeration system according to claim 1, characterized in that: The refrigeration capacity of the first compressor (11) is a first refrigeration capacity, the refrigeration capacity of the second compressor (12) is a second refrigeration capacity, and the ratio of the first refrigeration capacity to the second refrigeration capacity is 1.5:1-1.9:

1.

4. The refrigerator refrigeration system according to claim 3, characterized in that: When the refrigerating chamber is refrigerated, the refrigerant flows sequentially through the first compressor (11), the condenser (2), the solenoid valve (3), the first air outlet (31), the refrigerating capillary tube (41), the refrigerating evaporator (51), and the freezing evaporator (52).

5. The refrigerator refrigeration system according to claim 3, characterized in that: When the freezing chamber is refrigerated, the refrigerant flows sequentially through the second compressor (12), the condenser (2), the solenoid valve (3), the second air outlet (32), the freezing capillary tube (42), and the freezing evaporator (52).

6. The refrigerator refrigeration system according to claim 1, characterized in that: When the working state of the first compressor (11) is the start state, the working state of the second compressor (12) is the stop state; when the working state of the second compressor (12) is the start state, the working state of the first compressor (11) is the stop state.

7. A refrigerator, characterized in that: The refrigerator comprises a refrigerator refrigeration system, a cold storage chamber and a freezer chamber as described in any one of claims 1 to 6; the refrigerator refrigeration system provides cooling for the cold storage chamber and the freezer chamber respectively.

8. A refrigerator refrigeration method, characterized in that: The refrigerator refrigeration system applied to any one of claims 1 to 6 comprises: Get the refrigeration status of the refrigerator and freezer; If the refrigeration state of the refrigerating chamber is in the on state, the first compressor (11) is controlled to start, the second compressor (12) is controlled to stop, the first air outlet (31) is controlled to open, and the second air outlet (32) is controlled to close; If the refrigeration state of the freezer compartment is in the on state, the second compressor (12) is controlled to start, the first compressor (11) is controlled to stop, the first air outlet (31) is controlled to close, and the second air outlet (32) is controlled to open.

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