Refrigerator and refrigeration control method thereof

Abstract

The invention discloses a refrigerator and a refrigeration control method thereof, aiming at the refrigerator provided with two evaporators, the weight of a refrigerant flowing through each evaporator can be determined according to the running mode of the refrigerator and the refrigerating capacity required by a chamber, and the amount of the refrigerant required by the refrigerator can be fully matched in real time. And the phenomenon that the heat load is large but the refrigerant is insufficient or the heat load is small but the refrigerant is too much is avoided, so that the power consumption and the loss of key components such as a compressor are reduced.

Description

Technical Field

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

[0002] Refrigerators using mixed refrigerants can separate the refrigerants through a gas-liquid separator. They use ordinary refrigerant for normal cooling, and use cryogenic refrigerant for deep cooling (freezing temperature below -30°C) through a solenoid valve. When the refrigerator is operating in normal cooling mode, the solenoid valve is controlled to be open, and the mixed refrigerant enters the gas-liquid separator for separation. The separated liquid refrigerant enters the first evaporator through the solenoid valve for cooling, and the separated gaseous refrigerant is stored in the second evaporator for secondary cooling. When the refrigerator is operating in deep cooling mode, the solenoid valve is controlled to be closed, and the separated liquid refrigerant is stored at the bottom of the gas-liquid separator. The separated gaseous refrigerant enters the second evaporator for cooling. However, the required amount of the two refrigerants is usually fixed and does not change with the use of different refrigerators or different compartments. This makes it impossible to match the actual amount of refrigerant required by the refrigerator, which can easily lead to insufficient refrigerant for a large heat load or excessive refrigerant for a small heat load. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a refrigerator and a refrigeration control method thereof, which can fully match the amount of refrigerant required by the refrigerator in real time, avoiding the phenomenon of large heat load but insufficient refrigerant or small heat load but excessive refrigerant, thereby saving power consumption and loss of key components such as compressors.

[0004] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0005] a housing, wherein at least one compartment is formed in the housing;

[0006] A refrigeration system comprising a compressor, a condenser, a gas-liquid separator, a first evaporator, and a second evaporator, wherein three ends of the gas-liquid separator are respectively connected to the first evaporator, the second evaporator, and the condenser, the other end of the condenser is connected to the compressor, and the other end of the compressor is respectively connected to the first evaporator and the second evaporator;

[0007] a first stop valve, provided at a first end of the gas-liquid separator, for controlling the weight of liquid refrigerant flowing into the first evaporator;

[0008] a second stop valve, provided at the second end of the gas-liquid separator, for controlling the weight of the gaseous refrigerant flowing into the second evaporator;

[0009] The controller is configured as:

[0010] Obtaining a refrigeration mode of the refrigerator and calculating target refrigeration capacity required for all compartments;

[0011] determining a target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity;

[0012] An operating state of the first stop valve or the second stop valve is controlled according to the target weight, so that refrigerant meeting the target weight flows into the first evaporator or the second evaporator.

[0013] As an improvement to the above solution, the refrigerator further includes:

[0014] a solenoid valve, provided between the first evaporator and the first end of the gas-liquid separator, for controlling whether the liquid refrigerant flows into the first evaporator;

[0015] The controller is further configured to:

[0016] When the cooling mode is the normal cooling mode, controlling the solenoid valve to open;

[0017] When the refrigeration mode is the cryogenic refrigeration mode, the solenoid valve is controlled to be closed.

[0018] As an improvement to the above solution, the calculation of the target cooling capacity required for all compartments includes:

[0019] Obtain the ambient temperature of the environment in which the refrigerator is located, and obtain the target compartment temperature of the compartment;

[0020] For each compartment, the heat transfer amount of the current compartment is calculated according to the ambient temperature, the target compartment temperature of the current compartment, the preset heat transfer coefficient and the heat transfer area of ​​the current compartment;

[0021] The target cooling capacity is obtained by adding up the heat transfer of each compartment.

[0022] As an improvement to the above solution, determining the target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity includes:

[0023] When the refrigeration mode is a normal refrigeration mode, calculating a first target weight of the liquid refrigerant according to the target refrigeration capacity;

[0024] When the refrigeration mode is a cryogenic refrigeration mode, a second target weight of the gaseous refrigerant is calculated according to the target refrigeration capacity.

[0025] As an improvement to the above solution, controlling the working state of the first stop valve or the second stop valve according to the target weight includes:

[0026] When the refrigeration mode is a normal refrigeration mode, controlling the working state of the first stop valve according to the first target weight;

[0027] When the refrigeration mode is a cryogenic refrigeration mode, the working state of the second stop valve is controlled according to the second target weight.

[0028] As an improvement to the above solution, a float is provided in the gas-liquid separator, and the float is used to record the real-time liquid level value of the gas-liquid separator; then, the controller is further configured to include:

[0029] Obtaining a real-time liquid level value of the gas-liquid separator, and calculating a real-time weight of the liquid refrigerant in the gas-liquid separator according to the real-time liquid level value;

[0030] The real-time weight of the gaseous refrigerant is calculated according to the real-time weight of the liquid refrigerant and the total weight of the refrigerants.

[0031] To achieve the above objectives, an embodiment of the present invention further provides a refrigerator refrigeration control method, wherein the refrigerator refrigeration system includes a compressor, a condenser, a gas-liquid separator, a first evaporator, and a second evaporator, wherein three ends of the gas-liquid separator are connected to the first evaporator, the second evaporator, and the condenser, respectively; a first stop valve and a second stop valve are provided in the gas-liquid separator, wherein the first stop valve is used to control the weight of liquid refrigerant flowing into the first evaporator, and the second stop valve is used to control the weight of gaseous refrigerant flowing into the second evaporator; the method comprises:

[0032] Obtaining a refrigeration mode of the refrigerator and calculating target refrigeration capacity required for all compartments;

[0033] determining a target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity;

[0034] An operating state of the first stop valve or the second stop valve is controlled according to the target weight, so that refrigerant meeting the target weight flows into the first evaporator or the second evaporator.

[0035] As an improvement to the above solution, the refrigerator further includes a solenoid valve provided between the first evaporator and the first end of the gas-liquid separator. Then, the method further includes:

[0036] When the cooling mode is the normal cooling mode, controlling the solenoid valve to open;

[0037] When the refrigeration mode is the cryogenic refrigeration mode, the solenoid valve is controlled to be closed.

[0038] As an improvement to the above solution, the calculation of the target cooling capacity required for all compartments includes:

[0039] Obtain the ambient temperature of the environment in which the refrigerator is located, and obtain the target compartment temperature of the compartment;

[0040] For each compartment, the heat transfer amount of the current compartment is calculated according to the ambient temperature, the target compartment temperature of the current compartment, the preset heat transfer coefficient and the heat transfer area of ​​the current compartment;

[0041] The target cooling capacity is obtained by adding up the heat transfer of each compartment.

[0042] As an improvement to the above solution, determining the target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity includes:

[0043] When the refrigeration mode is a normal refrigeration mode, calculating a first target weight of the liquid refrigerant according to the target refrigeration capacity;

[0044] When the refrigeration mode is a cryogenic refrigeration mode, a second target weight of the gaseous refrigerant is calculated according to the target refrigeration capacity.

[0045] Compared with the prior art, the refrigerator and its refrigeration control method disclosed in the present invention, for a refrigerator with two evaporators, can determine the weight of the refrigerant flowing through each evaporator according to the operating mode of the refrigerator and the cooling capacity required by the compartment. The refrigerant is updated as different refrigerators or different compartments are used, and the amount of refrigerant required by the refrigerator can be fully matched in real time, avoiding the phenomenon of insufficient refrigerant when the heat load is large or excessive refrigerant when the heat load is small, thereby saving power consumption and loss of key components such as compressors. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0047] Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0048] Figure 3 1 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0049] Figure 4 is a structural diagram of a gas-liquid separator provided by an embodiment of the present invention;

[0050] Figure 5 1 is a schematic diagram of the connection between the controller and its control components provided by an embodiment of the present invention;

[0051] Figure 6 This is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0052] Figure 7 This is a second working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0053] Figure 8 is a P / H diagram of a refrigeration system provided by an embodiment of the present invention;

[0054] Figure 9 This is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0055] Figure 10 This is a flow chart of a refrigerator refrigeration control method provided by an embodiment of the present invention.

[0056] Among them, 100, refrigerator; 10, display screen; 11, cold storage compartment; 12, freezer compartment; 1, compressor; 2, condenser; 3, gas-liquid separator; 4, first evaporator; 5, second evaporator; 6, solenoid valve; 7, three-way valve; 3a, first end of the gas-liquid separator; 3b, second end of the gas-liquid separator; 3c, third end of the gas-liquid separator; 31, first stop valve; 32, second stop valve; 33, buoy. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0058] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0059] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0060] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0061] See also Figure 1 , Figure 1 It is a schematic diagram of the external structure of a refrigerator 100 provided in an embodiment of the present invention. The refrigerator 100 of this embodiment has an approximately rectangular parallelepiped shape. The refrigerator includes a box body that defines a storage space and a plurality of door bodies provided at the opening of the box body, wherein the door body includes a door body shell located on the outside of the box body, a door body liner located on the inside of the box body, an upper end cover, a lower end cover, and an insulation layer located between the door body shell, the door body liner, the upper end cover, and the lower end cover; usually, the insulation layer is filled with foam material. The box body is provided with a cavity, wherein the cavity includes a component storage cavity for placing components in the refrigerator, such as a press cabin, etc., and also includes a storage space for storing food, etc. The door of the refrigerator is provided with a display screen 10, and the display screen is used to display refrigerator operating parameters and receive user touch operations.

[0062] See also Figure 2 , Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention. The storage space can be divided into multiple storage rooms. The storage rooms can be configured as a refrigerator 11 and a freezer 12 according to different uses. They can also include a variable temperature room, a vacuum drawer, a moisturizing drawer, etc. Each storage room corresponds to one or more doors, for example, Figure 2 The storage room in the middle and upper part is provided with a double-door body. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to realize drawer-like storage.

[0063] See also Figure 3 , Figure 3A schematic diagram of the structure of the refrigeration system in a refrigerator 100 provided in an embodiment of the present invention includes a compressor 1, a condenser 2, a gas-liquid separator 3, a first evaporator 4, and a second evaporator 5. The first end 3a of the gas-liquid separator 3 is connected to the first evaporator 4, the second end 3b of the gas-liquid separator 3 is connected to the second evaporator 5, and the third end 3c of the gas-liquid separator 3 is connected to the condenser 2. The other end of the condenser 2 is connected to the air outlet of the compressor 1. The air inlet of the compressor 1 is connected to the first evaporator 4 and the second evaporator 5 respectively via a three-way valve 7. A solenoid valve 6 is provided between the first evaporator 4 and the first end 3a of the gas-liquid separator 3. The solenoid valve 6 is used to control whether liquid refrigerant flows into the first evaporator 4.

[0064] For example, when the refrigerator is plugged in and the thermostat contacts are connected, compressor 1 begins operating. Low-temperature, low-pressure refrigerant is drawn into compressor 1, compressed into high-temperature, high-pressure superheated gas within the compressor cylinder, and then discharged into condenser 2. The high-temperature, high-pressure refrigerant gas dissipates heat through condenser 2, its temperature continuously decreasing, gradually cooling to a saturated vapor at room temperature and high pressure. It then further cools to a saturated liquid, where its temperature no longer decreases. This temperature is called the condensing temperature. When the refrigerator is operating in normal cooling mode, the refrigerator controller controls solenoid valve 6 to open. At this point, the mixed refrigerant enters gas-liquid separator 3 for separation. The separated liquid refrigerant flows through first end 3a of gas-liquid separator 3, through solenoid valve 6, and into first evaporator 4, causing first evaporator 4 to begin cooling. The gaseous refrigerant separated in gas-liquid separator 3 flows through second end 3b of gas-liquid separator 3 into second evaporator 5 for secondary cooling. When the refrigerator is operating in the cryogenic refrigeration mode, the solenoid valve 6 is controlled to be closed, and the separated liquid refrigerant is stored at the bottom of the gas-liquid separator. At this time, the liquid refrigerant will not flow into the first evaporator 4, and the separated gaseous refrigerant enters the second evaporator 5 for refrigeration.

[0065] See also Figure 4 , Figure 4 This is a structural diagram of a gas-liquid separator 3 according to an embodiment of the present invention. A first stop valve 31 is provided at a first end 3a of the gas-liquid separator 3. The first stop valve 31 is used to control the weight of liquid refrigerant flowing into the first evaporator 4. A second stop valve 32 is provided at a second end 3b of the gas-liquid separator 3. The second stop valve 32 is used to control the weight of gaseous refrigerant flowing into the second evaporator 5. The gas-liquid separator 3 is also provided with a float 33 for recording the real-time liquid level of the gas-liquid separator 3.

[0066] See also Figure 5 , Figure 5: This is a connection diagram of the controller and its control components provided in an embodiment of the present invention. The controller can control the start and stop of the compressor, as well as the operating frequency of the compressor. The controller can also control the opening and closing of the first stop valve 31 and the second stop valve 32. When the first evaporator 4 is required to cool, the first stop valve 31 is opened. At this time, the liquid refrigerant flows out from the first end 3a of the gas-liquid separator 3 and flows into the first evaporator 4 through the solenoid valve 6 (when open). The first evaporator 4 starts to cool. When the amount of liquid refrigerant flowing through the first evaporator 4 is sufficient, the first stop valve 31 is closed. When the second evaporator 5 is required to cool, the second stop valve 32 is opened. At this time, the gaseous refrigerant flows out from the second end 3b of the gas-liquid separator 3 and flows into the second evaporator 5. The second evaporator 5 starts to cool. When the amount of liquid refrigerant flowing through the second evaporator 5 is sufficient, the second stop valve 32 is closed.

[0067] Specifically, the controller is further configured to: when the refrigeration mode is the normal refrigeration mode, control the solenoid valve to open; when the refrigeration mode is the deep cooling mode, control the solenoid valve to close. Figure 7 , Figure 7 This is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. In normal refrigeration mode, the solenoid valve 6 is opened, and the liquid refrigerant flows into the first evaporator 4. In deep-freeze refrigeration mode, the solenoid valve 6 is opened, and the liquid refrigerant is stored in the gas-liquid separator 3.

[0068] Specifically, the controller is configured to: obtain the refrigeration mode of the refrigerator and calculate the target refrigeration capacity required for all compartments; determine the target weight of the refrigerant based on the refrigeration mode and the target refrigeration capacity; and control the working state of the first stop valve or the second stop valve according to the target weight so that the refrigerant meeting the target weight flows into the first evaporator or the second evaporator.

[0069] For example, see Figure 6 , Figure 6 This is a second workflow diagram of a controller in a refrigerator provided by an embodiment of the present invention, wherein calculating the target cooling capacity required for all compartments includes: obtaining the ambient temperature of the environment in which the refrigerator is located and obtaining the target compartment temperature of the compartment; for each compartment, calculating the heat transfer amount of the current compartment based on the ambient temperature, the target compartment temperature of the current compartment, a preset heat transfer coefficient, and the heat transfer area of ​​the current compartment; and accumulating the heat transfer amount of each compartment to obtain the target cooling capacity.

[0070] For example, the refrigerator door is provided with an ambient temperature sensor for detecting the ambient temperature. The target compartment temperature can be obtained by the refrigerator gear position. The heat transfer coefficient is a preset value. The heat transfer area is the area of ​​the inner wall of the compartment, which can be pre-calculated and stored in the refrigerator database before shipment. The heat transfer amount of the current compartment is calculated based on the ambient temperature, the target compartment temperature of the current compartment, the preset heat transfer coefficient, and the heat transfer area of ​​the current compartment, satisfying the following formula:

[0071] Q i =k*S i *ΔT i (1);

[0072] Among them, Q i is the heat transfer of the i-th compartment, i = 1, 2...n, n is the total number of compartments; k is the heat transfer coefficient; S i is the heat transfer area of ​​the i-th compartment; ΔT i =|T2 i -T1|,ΔT i is the heat transfer temperature difference of the i-th compartment, T1 is the ambient temperature, T2 i is the target compartment temperature of the i-th compartment.

[0073] Furthermore, the target cooling capacity is obtained by accumulating the heat transfer of each compartment, which satisfies the following formula:

[0074]

[0075] For example, see Figure 8 , Figure 8 This is the P / H diagram of the refrigeration system provided by an embodiment of the present invention. In refrigeration engineering, the most commonly used thermodynamic diagram is the refrigerant pressure-enthalpy diagram (i.e., P / H diagram). The vertical axis represents the compressor pressure value, and the horizontal axis represents the enthalpy value. Liquid vaporization refrigeration is a widely used refrigeration method that utilizes the heat absorption effect of liquid vaporization to achieve refrigeration. A vapor compression refrigeration system is one such method. In this system, the compressor compresses and transports the refrigerant vapor, resulting in low pressure in the evaporator and high pressure in the condenser. It is the heart of the entire system. The expansion valve (throttle valve) throttles and reduces the pressure of the high-pressure liquid refrigerant, while also regulating its flow into the evaporator. The evaporator's function is to output cooling capacity. The refrigerant absorbs heat from the cooled medium in the evaporator, thereby generating cooling capacity. The condenser is responsible for outputting heat. The cooling medium removes the heat absorbed by the refrigerant in the evaporator from the condenser, as well as the heat converted from the work consumed by the compressor. According to the second law of thermodynamics, the work consumed by the compressor plays a compensatory role, allowing the refrigerant to continuously absorb heat from the low-temperature medium and release heat to the high-temperature medium, completing the entire refrigeration cycle.

[0076] For example, the refrigerant absorbs heat from the cooled medium in the evaporator, boiling at pressure P0 and temperature t0, reaching state 1. At this point, the enthalpy is h1, indicating a saturated vapor state. As the compressor continuously draws the vapor from the evaporator, to prevent liquid droplets from entering the compressor, the refrigerant typically continues to absorb some heat even after complete evaporation. In effect, the compressor draws in superheated saturated vapor. Steps 1-2 represent the superheating process. Point 2 is the compressor suction point, where the enthalpy is h2. Passing point 2, the compressor compresses the superheated vapor to point 3. The compression work of the compressor raises the refrigerant vapor pressure to Pk and the temperature to t3. Steps 2-3 represent the compression process. Point 3 is the compressor discharge point, where the refrigerant remains in a superheated vapor state. The superheated steam entering the condenser first releases part of its heat to the external cooling medium, and becomes saturated steam under isobaric conditions, reaching point 4. 3-4 is the cooling process, and then continues to release heat under isothermal and isobaric conditions until it condenses into a saturated liquid, reaching point 5. 4-5 is the condensation process. The enthalpy values ​​corresponding to points 4 and 5 are h4 and h5, respectively, satisfying h4=h5. Therefore, under the pressure corresponding to the steam compression cycle, the enthalpy values ​​h1 and h4 before and after the evaporator is refrigerated are obtained by checking the P / H diagram. It can be understood that the pressure and enthalpy values ​​are constantly changing with the environment. The database of the refrigerator can pre-store P / H diagrams for several different environmental parameters (such as ambient temperature), and then the corresponding enthalpy values ​​h1 and h4 can be obtained based on the current environmental parameters of the refrigerator. The calculation formula for the target cooling capacity required by the refrigerator satisfies:

[0077] Q = m(h1-h4) (3);

[0078] Wherein, Q is the target cooling capacity, and m is the weight of the refrigerant.

[0079] Specifically, determining the target weight of the refrigerant based on the refrigeration mode and the target refrigeration capacity includes: when the refrigeration mode is a normal refrigeration mode, calculating the first target weight of the liquid refrigerant based on the target refrigeration capacity; when the refrigeration mode is a cryogenic refrigeration mode, calculating the second target weight of the gaseous refrigerant based on the target refrigeration capacity.

[0080] For example, see Figure 9 , Figure 9 : is a third working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention. When the refrigeration mode is the normal refrigeration mode, the first target weight m1 of the liquid refrigerant is calculated according to the target refrigeration capacity, and the following is obtained according to formula (3):

[0081]

[0082] When the refrigeration mode is a cryogenic refrigeration mode, the second target weight m2 of the gaseous refrigerant is calculated according to the target refrigeration capacity, and is obtained according to formula (3):

[0083]

[0084] Specifically, controlling the operating state of the first stop valve or the second stop valve according to the target weight includes: when the refrigeration mode is a normal refrigeration mode, controlling the operating state of the first stop valve according to the first target weight; when the refrigeration mode is a cryogenic refrigeration mode, controlling the operating state of the second stop valve according to the second target weight. The controller is further configured to: obtain a real-time liquid level value of the gas-liquid separator, calculate the real-time weight of the liquid refrigerant in the gas-liquid separator based on the real-time liquid level value; and calculate the real-time weight of the gaseous refrigerant based on the real-time weight of the liquid refrigerant and the total weight of the refrigerant.

[0085] For example, the refrigerant in the gas-liquid separator is sufficient to meet the needs of different environmental conditions. In this embodiment of the present invention, a first stop valve 31 is installed at the first end 3a of the gas-liquid separator 3, and a second stop valve 32 is installed at the second end 3b. When the cooling mode is normal cooling mode, after the first stop valve is controlled to open, the real-time weight of the liquid refrigerant flowing out is calculated in real time (this can be calculated by installing a flow meter at the first end 3a). When the real-time weight of the outflowing liquid refrigerant reaches the first target weight m1 within a period of time (which can be a cooling cycle, i.e., the process from the compressor meeting the "start-stop" period), the first stop valve 31 is closed. When the cooling mode is deep cooling mode, the first stop valve 31 is closed and the second stop valve 32 is opened. Since the liquid refrigerant is stored in the gas-liquid separator 3, the real-time liquid level value can be detected by the float 33. The real-time weight of the gaseous refrigerant is calculated based on the real-time weight of the liquid refrigerant and the total weight of the refrigerant within a period of time. When the real-time weight of the gaseous refrigerant reaches the second target weight m2, the second stop valve 32 is controlled to close. After the first stop valve 31 and the second stop valve 32 go through an “open-close” process, they enter the next cycle.

[0086] Compared with the prior art, the refrigerator disclosed in the embodiment of the present invention is a refrigerator with two evaporators. The weight of the refrigerant flowing through each evaporator can be determined according to the operating mode of the refrigerator and the required cooling capacity of the compartment. Since the pressure and enthalpy values ​​in the compressor are constantly changing with the environment, the amount of refrigerant required by the refrigerator can be fully matched in real time, avoiding the phenomenon of large heat load but insufficient refrigerant or small heat load but excessive refrigerant, thereby saving power consumption and loss of key components such as compressors.

[0087] See also Figure 10 , Figure 10This is a flowchart of a refrigerator refrigeration control method provided by an embodiment of the present invention. The method is executed by a controller in the refrigerator. The refrigerator refrigeration system includes a compressor, a condenser, a gas-liquid separator, a first evaporator, and a second evaporator. The three ends of the gas-liquid separator are connected to the first evaporator, the second evaporator, and the condenser, respectively. The gas-liquid separator is provided with a first stop valve and a second stop valve. The first stop valve is used to control the weight of liquid refrigerant flowing into the first evaporator, and the second stop valve is used to control the weight of gaseous refrigerant flowing into the second evaporator. The method includes:

[0088] S1. Obtaining the refrigeration mode of the refrigerator and calculating the target refrigeration capacity required for all compartments;

[0089] S2. determining a target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity;

[0090] S3. Control the working state of the first stop valve or the second stop valve according to the target weight, so that the refrigerant meeting the target weight flows into the first evaporator or the second evaporator.

[0091] Specifically, the refrigerator also includes a solenoid valve arranged between the first evaporator and the first end of the gas-liquid separator. Then, the method also includes: when the refrigeration mode is a normal refrigeration mode, controlling the solenoid valve to open; when the refrigeration mode is a deep-freeze refrigeration mode, controlling the solenoid valve to close.

[0092] Specifically, the calculation of the target cooling capacity required for all compartments includes: obtaining the ambient temperature of the environment in which the refrigerator is located, and obtaining the target compartment temperature of the compartment; for each compartment, calculating the heat transfer amount of the current compartment based on the ambient temperature, the target compartment temperature of the current compartment, a preset heat transfer coefficient, and the heat transfer area of ​​the current compartment; and accumulating the heat transfer amount of each compartment to obtain the target cooling capacity.

[0093] Specifically, determining the target weight of the refrigerant based on the refrigeration mode and the target refrigeration capacity includes: when the refrigeration mode is a normal refrigeration mode, calculating the first target weight of the liquid refrigerant based on the target refrigeration capacity; when the refrigeration mode is a cryogenic refrigeration mode, calculating the second target weight of the gaseous refrigerant based on the target refrigeration capacity.

[0094] Specifically, controlling the working state of the first stop valve or the second stop valve according to the target weight includes: when the refrigeration mode is the normal refrigeration mode, controlling the working state of the first stop valve according to the first target weight; when the refrigeration mode is the deep cold refrigeration mode, controlling the working state of the second stop valve according to the second target weight.

[0095] Specifically, a float is provided in the gas-liquid separator, and the float is used to record the real-time liquid level value of the gas-liquid separator; then, the method also includes: obtaining the real-time liquid level value of the gas-liquid separator, and calculating the real-time weight of the liquid refrigerant in the gas-liquid separator according to the real-time liquid level value; and calculating the real-time weight of the gaseous refrigerant according to the real-time weight of the liquid refrigerant and the total weight of the refrigerant.

[0096] It is worth noting that the working process of the refrigerator refrigeration control method described in the embodiment of the present invention can refer to the working process of the controller in the refrigerator described in the above embodiment, and will not be repeated here.

[0097] Compared with the prior art, the refrigerator refrigeration control method disclosed in the embodiment of the present invention, for a refrigerator with two evaporators, can determine the weight of the refrigerant flowing through each evaporator according to the operating mode of the refrigerator and the required cooling capacity of the compartment. Since the pressure and enthalpy values ​​in the compressor are constantly changing with the environment, the amount of refrigerant required by the refrigerator can be fully matched in real time, avoiding the phenomenon of large heat load but insufficient refrigerant or small heat load but excessive refrigerant, thereby saving power consumption and loss of key components such as compressors.

[0098] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: a housing, wherein at least one compartment is formed in the housing; A refrigeration system comprising a compressor, a condenser, a gas-liquid separator, a first evaporator, and a second evaporator, wherein three ends of the gas-liquid separator are respectively connected to the first evaporator, the second evaporator, and the condenser, the other end of the condenser is connected to the compressor, and the other end of the compressor is respectively connected to the first evaporator and the second evaporator; a first stop valve, provided at a first end of the gas-liquid separator, for controlling the weight of liquid refrigerant flowing into the first evaporator; a second stop valve, provided at the second end of the gas-liquid separator, for controlling the weight of the gaseous refrigerant flowing into the second evaporator; The controller is configured as: Obtaining a refrigeration mode of the refrigerator and calculating target refrigeration capacity required for all compartments; determining a target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity; An operating state of the first stop valve or the second stop valve is controlled according to the target weight, so that refrigerant meeting the target weight flows into the first evaporator or the second evaporator.

2. The refrigerator according to claim 1, wherein The refrigerator further comprises: a solenoid valve, provided between the first evaporator and the first end of the gas-liquid separator, for controlling whether the liquid refrigerant flows into the first evaporator; The controller is further configured to: When the cooling mode is the normal cooling mode, controlling the solenoid valve to open; When the refrigeration mode is the cryogenic refrigeration mode, the solenoid valve is controlled to be closed.

3. The refrigerator according to claim 1, wherein The target cooling capacity required for all compartments is calculated, including: Obtain the ambient temperature of the environment in which the refrigerator is located, and obtain the target compartment temperature of the compartment; For each compartment, the heat transfer amount of the current compartment is calculated according to the ambient temperature, the target compartment temperature of the current compartment, the preset heat transfer coefficient and the heat transfer area of ​​the current compartment; The target cooling capacity is obtained by adding up the heat transfer of each compartment.

4. The refrigerator according to claim 1, wherein The determining the target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity includes: When the refrigeration mode is a normal refrigeration mode, calculating a first target weight of the liquid refrigerant according to the target refrigeration capacity; When the refrigeration mode is a cryogenic refrigeration mode, a second target weight of the gaseous refrigerant is calculated according to the target refrigeration capacity.

5. The refrigerator according to claim 4, wherein: The controlling the working state of the first stop valve or the second stop valve according to the target weight includes: When the refrigeration mode is a normal refrigeration mode, controlling the working state of the first stop valve according to the first target weight; When the refrigeration mode is a cryogenic refrigeration mode, the working state of the second stop valve is controlled according to the second target weight.

6. The refrigerator according to claim 1, wherein The gas-liquid separator is provided with a float, and the float is used to record the real-time liquid level value of the gas-liquid separator; then, the controller is further configured to include: Obtaining a real-time liquid level value of the gas-liquid separator, and calculating a real-time weight of the liquid refrigerant in the gas-liquid separator according to the real-time liquid level value; The real-time weight of the gaseous refrigerant is calculated according to the real-time weight of the liquid refrigerant and the total weight of the refrigerants.

7. A refrigerator refrigeration control method, characterized in that: The refrigerator refrigeration system includes a compressor, a condenser, a gas-liquid separator, a first evaporator, and a second evaporator, wherein three ends of the gas-liquid separator are connected to the first evaporator, the second evaporator, and the condenser, respectively; a first stop valve and a second stop valve are provided in the gas-liquid separator, the first stop valve is used to control the weight of liquid refrigerant flowing into the first evaporator, and the second stop valve is used to control the weight of gaseous refrigerant flowing into the second evaporator; then, the method includes: Obtaining a refrigeration mode of the refrigerator and calculating target refrigeration capacity required for all compartments; determining a target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity; An operating state of the first stop valve or the second stop valve is controlled according to the target weight, so that refrigerant meeting the target weight flows into the first evaporator or the second evaporator.

8. The refrigerator refrigeration control method according to claim 7, wherein: The refrigerator further includes a solenoid valve provided between the first evaporator and the first end of the gas-liquid separator, and the method further includes: When the cooling mode is the normal cooling mode, controlling the solenoid valve to open; When the refrigeration mode is the cryogenic refrigeration mode, the solenoid valve is controlled to be closed.

9. The refrigerator refrigeration control method according to claim 7, wherein: The target cooling capacity required for all compartments is calculated, including: Obtain the ambient temperature of the environment in which the refrigerator is located, and obtain the target compartment temperature of the compartment; For each compartment, the heat transfer amount of the current compartment is calculated according to the ambient temperature, the target compartment temperature of the current compartment, the preset heat transfer coefficient and the heat transfer area of ​​the current compartment; The target cooling capacity is obtained by adding up the heat transfer of each compartment.

10. The refrigerator refrigeration control method according to claim 7, wherein: The determining the target weight of the refrigerant according to the refrigeration mode and the target refrigeration capacity includes: When the refrigeration mode is a normal refrigeration mode, calculating a first target weight of the liquid refrigerant according to the target refrigeration capacity; When the refrigeration mode is a cryogenic refrigeration mode, a second target weight of the gaseous refrigerant is calculated according to the target refrigeration capacity.

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