Refrigerator and refrigeration control method thereof

Abstract

The application discloses a refrigerator and a refrigeration control method thereof. The refrigerator comprises a first compressor, a first condenser, a gas-liquid separation device, a reversing device, a refrigeration branch, a freezing branch, a two-stage refrigeration system, and a controller. The first compressor, the first condenser, the gas-liquid separation device, the reversing device, and the refrigeration branch are sequentially connected in series to form a circuit. The freezing branch is connected in parallel to two ends of the refrigeration branch. The two-stage refrigeration system is arranged between a gas phase outlet of the gas-liquid separation device and the freezing branch, and is provided with a second compressor and a second condenser. The controller is used for controlling the second compressor to be closed in a normal refrigeration mode, controlling the reversing device to make liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on a refrigeration temperature, and controlling the first compressor to be started and stopped. In a deep refrigeration mode, the controller controls the reversing device to make liquid refrigerant flow through the refrigeration branch but not flow through the freezing branch, and controls the first compressor and the second compressor to be started and stopped based on a refrigeration temperature of the refrigerator. The application can improve the refrigeration efficiency of the refrigerator and reduce noise generated in the refrigeration process of the refrigerator.

Description

Technical Field

[0001] This invention relates to the field of refrigerator technology, and more particularly to a refrigerator and its refrigeration control method. Background Technology

[0002] Currently, existing refrigerators primarily use a single-system mixed refrigerant system to cool the compartments in order to achieve deep-cold cooling. In normal operation, the mixed refrigerant system cools both the freezer and refrigerator compartments separately. In deep-cold cooling mode, R600a refrigerant is used to cool R290 refrigerant, and then the R290 refrigerant cools the freezer compartment. However, this single-system mixed refrigerant cooling method requires a relatively high compression ratio in the compressor for deep-cold cooling, resulting in higher noise levels during the cooling process. Summary of the Invention

[0003] This invention provides a refrigerator and its refrigeration control method, which can improve the refrigeration efficiency of the refrigerator while reducing the noise generated during the refrigeration process.

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

[0005] A primary refrigeration system includes a first compressor, a first condenser, a gas-liquid separator, a reversing device, and a refrigeration branch connected in series to form a loop. A refrigeration branch is connected in parallel to both ends of the refrigeration branch. The reversing device is connected to the liquid phase outlet of the gas-liquid separator, the inlet of the refrigeration branch, and the inlet of the refrigeration branch, respectively. The refrigeration branch includes a first throttling device and a refrigeration evaporator connected in series, and the refrigeration branch includes a second throttling device and a refrigeration evaporator connected in series.

[0006] A two-stage refrigeration system is located between the gas phase outlet of the gas-liquid separation device and the inlet of the refrigeration branch, and a second compressor and a second condenser are sequentially installed on it along the flow direction of the refrigerant.

[0007] Controller, used for:

[0008] In the preset normal cooling mode, the second compressor is controlled to turn off, and the reversing device is controlled to make the liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on the cooling temperature of the refrigerator, and the start and stop of the first compressor are controlled.

[0009] In the preset deep-cold refrigeration mode, the reversing device is controlled to make the liquid refrigerant flow through the refrigeration branch and not through the freezing branch, and the start and stop of the first compressor and the second compressor are controlled based on the refrigeration temperature of the refrigerator.

[0010] The refrigerator provided in the second embodiment of the present invention uses a non-azeotropic refrigerant mixture as the refrigerant.

[0011] The refrigerator provided in the third embodiment of the present invention uses a mixed refrigerant composed of R290 and R600a working refrigerants.

[0012] The refrigerator provided in the fourth embodiment of the present invention includes a reversing device comprising:

[0013] The three-way reversing valve has its first end connected to the liquid phase outlet of the gas-liquid separation device, its second end connected to the inlet of the refrigeration branch, and its third end connected to the inlet of the freezing branch.

[0014] The refrigerator provided in the fifth embodiment of the present invention includes a reversing device comprising:

[0015] The first switching valve has its first end connected to the liquid phase outlet of the gas-liquid separation device and its second end connected to the inlet of the refrigeration branch.

[0016] The second switching valve has its first end connected to the liquid phase outlet of the gas-liquid separation device and its second end connected to the inlet of the refrigeration branch.

[0017] The refrigerator provided in the sixth embodiment of the present invention has at least one compartment inside which the refrigeration evaporator provides cooling capacity;

[0018] The refrigerator also includes:

[0019] A refrigeration fan is located around the refrigeration evaporator and is used to deliver the cooling capacity generated by the refrigeration evaporator to the corresponding compartment.

[0020] The refrigerator provided in the seventh embodiment of the present invention has at least one compartment inside which the cooling capacity is provided by the freezer evaporator;

[0021] The refrigerator also includes:

[0022] A refrigeration fan is located around the refrigeration evaporator and is used to deliver the cooling capacity generated by the refrigeration evaporator to the corresponding compartment.

[0023] In the refrigerator provided in the eighth embodiment of the present invention, the first throttling device is a capillary tube or an expansion valve, and the second throttling device is a capillary tube or an expansion valve.

[0024] In the ninth embodiment of the present invention, the refrigerator provided has both the refrigeration evaporator and the freezing evaporator as finned evaporators.

[0025] The tenth embodiment of the present invention provides a refrigeration control method for a refrigerator, wherein the refrigerator includes a primary refrigeration system and a secondary refrigeration system; wherein, the primary refrigeration system includes a first compressor, a first condenser, a gas-liquid separator, a reversing device, and a refrigeration branch connected in series to form a loop, and a refrigeration branch is connected in parallel at both ends of the refrigeration branch; the reversing device is connected to the liquid phase outlet of the gas-liquid separator, the inlet of the refrigeration branch, and the inlet of the refrigeration branch respectively; the refrigeration branch includes a first throttling device and a refrigeration evaporator connected in series, and the refrigeration branch includes a second throttling device and a refrigeration evaporator connected in series; the secondary refrigeration system is located between the gas phase outlet of the gas-liquid separator and the inlet of the refrigeration branch, and a second compressor and a second condenser are sequentially arranged on it along the refrigerant flow direction; then, the method includes:

[0026] In the preset normal cooling mode, the second compressor is controlled to turn off, and the reversing device is controlled to make the liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on the cooling temperature of the refrigerator, and the start and stop of the first compressor are controlled.

[0027] In the preset deep-cold refrigeration mode, the reversing device is controlled to make the liquid refrigerant flow through the refrigeration branch and not through the freezing branch, and the start and stop of the first compressor and the second compressor are controlled based on the refrigeration temperature of the refrigerator.

[0028] Compared to existing technologies, the refrigerator and its refrigeration control method provided in this embodiment of the invention include: a primary refrigeration system and a secondary refrigeration system; wherein, the primary refrigeration system includes a first compressor, a first condenser, a gas-liquid separator, a reversing device, and a refrigeration branch connected in series to form a loop, with a refrigeration branch connected in parallel at both ends; the reversing device is connected to the liquid phase outlet of the gas-liquid separator, the inlet of the refrigeration branch, and the inlet of the refrigeration branch, respectively; the secondary refrigeration system is located between the gas phase outlet of the gas-liquid separator and the inlet of the refrigeration branch. The two-stage refrigeration system is equipped with a second compressor and a second condenser sequentially along the refrigerant flow direction. In a preset conventional refrigeration mode, the refrigerator controller shuts off the second compressor and, based on the refrigerator's refrigeration temperature, controls the reversing device to allow liquid refrigerant to flow through the refrigeration branch and / or the freezing branch, and controls the start and stop of the first compressor. In a preset deep-cold refrigeration mode, the controller controls the reversing device to allow liquid refrigerant to flow through the refrigeration branch but not the freezing branch, and controls the start and stop of the first and second compressors based on the refrigerator's refrigeration temperature. Therefore, this invention, on the one hand, enables the use of a single refrigerant for refrigeration in conventional refrigeration mode, improving refrigeration efficiency and reducing noise. On the other hand, in deep-cold refrigeration mode, a refrigerant with a relatively low condensation temperature is used for deep-cold refrigeration. Furthermore, since two compressors are connected in series for staged compression during deep-cold refrigeration, the compression ratio of a single compressor can be reduced to improve refrigeration efficiency and reduce compressor vibration during operation, thereby reducing refrigerator operating noise. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a first refrigerator provided in an embodiment of the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of a second refrigerator provided in an embodiment of the present invention.

[0031] Figure 3 This is a schematic diagram of the refrigeration system of a refrigerator according to an embodiment of the present invention.

[0032] Figure 4 This is a schematic diagram of the structure of a third type of refrigerator provided in an embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of the structure of a first refrigerator control system provided in an embodiment of the present invention.

[0034] Figure 6 This is a schematic diagram of the refrigerant flow direction in a refrigerator under normal cooling mode, provided by an embodiment of the present invention.

[0035] Figure 7 This is a schematic diagram of the refrigerant flow direction in a refrigerator under deep cooling mode, provided by an embodiment of the present invention.

[0036] Figure 8 This is a schematic diagram of the control system of a second refrigerator provided in an embodiment of the present invention.

[0037] Figure 9 This is a schematic diagram of the control system of a third type of refrigerator provided in an embodiment of the present invention.

[0038] Figure 10 This is a schematic flowchart of a refrigerator refrigeration control method provided in an embodiment of the present invention.

[0039] The reference numerals in the attached drawings are as follows: 1. First compressor; 2. First condenser; 3. Gas-liquid separation device; 4. Reversing device; 41. First switching valve; 42. Second switching valve; 5. First throttling device; 6. Refrigerated evaporator; 7. Second throttling device; 8. Freezing evaporator; 9. Second compressor; 10. Second condenser; 11. Controller; 12. First temperature detection device; 13. Second temperature detection device; 100. Cabinet; 200. Door; 201. Door outer shell; 202. Door inner liner; 203. Upper end cover; 204. Lower end cover. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] See Figure 1 This is a schematic diagram of the structure of a refrigerator provided in an embodiment of the present invention.

[0045] The refrigerator provided in this embodiment of the invention includes a cabinet 100. The cabinet 100 has at least one compartment. Specifically, as shown below... Figure 1 and Figure 2 As shown, the refrigerator in this embodiment has an approximately rectangular parallelepiped shape. The refrigerator includes a cabinet 100 defining a storage space, and the cabinet 100 has at least one compartment. The compartment can be configured as a refrigerator compartment, freezer compartment, variable temperature compartment, etc., depending on its purpose. For example, in... Figure 1 The upper compartment is a refrigerator compartment, and the lower compartment is a freezer compartment. Furthermore, each compartment opening has one or more doors 200. Specifically, as shown... Figure 2 As shown, the upper refrigerator compartment is equipped with a double door; wherein, the door 200 includes a door shell 201 located outside the cabinet 100, a door inner liner 202 located inside the cabinet 100, an upper end cover 203, a lower end cover 204, and an insulation layer located between the door shell 201, the door inner liner 202, the upper end cover 203, and the lower end cover 204. Typically, the insulation layer is filled with foam material.

[0046] The refrigerator provided in this embodiment of the invention further includes a primary refrigeration system and a secondary refrigeration system, which are used to refrigerate the compartments within the cabinet 100. In a specific embodiment, see... Figure 3The primary refrigeration system includes a first compressor 1, a first condenser 2, a gas-liquid separator 3, a reversing device 4, and a refrigeration branch connected in series to form a loop. A refrigeration branch is connected in parallel to both ends of the refrigeration branch. Specifically, the reversing device 4 is connected to the liquid phase outlet of the gas-liquid separator 3, the inlet of the refrigeration branch, and the inlet of the refrigeration branch. The input end of the reversing device 4 is connected to the liquid phase outlet of the gas-liquid separator 3, and the two output ends of the reversing device 4 are connected to the inlet of the refrigeration branch and the inlet of the refrigeration branch, respectively. Furthermore, the refrigeration branch includes a first throttling device 5 and a refrigeration evaporator 6 connected in series, and the freezing branch includes a second throttling device 7 and a freezing evaporator 8 connected in series; wherein, the first end of the first throttling device 5 is the inlet of the refrigeration branch, and the second end of the first throttling device 5 is connected to the suction port of the first compressor 1 through the refrigeration evaporator 6; the first end of the second throttling device 7 is the inlet of the freezing branch, and the second end of the second throttling device 7 is connected to the suction port of the first compressor 1 through the freezing evaporator 8. Further, the secondary refrigeration system is located between the gas phase outlet of the gas-liquid separator 3 and the inlet of the freezing branch, and a second compressor 9 and a second condenser 10 are sequentially arranged on it along the refrigerant flow direction. Specifically, the suction port of the second compressor 9 is connected to the gas phase outlet of the gas-liquid separator 3, and the discharge port of the second compressor 9 is connected to the inlet of the freezing branch through the second condenser 10. For example, see [link to example]. Figure 4 In a refrigerator with a refrigerator compartment and a freezer compartment, a refrigerator evaporator 6 is used to provide cooling capacity to the refrigerator compartment, and a freezer evaporator 8 is used to provide cooling capacity to the freezer compartment.

[0047] See Figure 5 The refrigerator provided in this embodiment of the invention further includes a controller 11; wherein the controller 11 is connected to the first compressor 1, the second compressor 9, and the reversing device 4 respectively, so as to control the first compressor 1, the second compressor 9, and the reversing device 4 respectively. Specifically, the controller 11 is used for:

[0048] In the preset normal cooling mode, the second compressor 9 is controlled to shut down, and the reversing device 4 is controlled to make the liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on the refrigeration temperature of the refrigerator, and the start and stop of the first compressor 1 are controlled.

[0049] In the preset deep-cold refrigeration mode, the control reversing device 4 causes the liquid refrigerant to flow through the refrigeration branch but not through the freezing branch, and controls the start and stop of the first compressor 1 and the second compressor 9 based on the refrigeration temperature of the refrigerator.

[0050] In the refrigerator provided in this embodiment, the refrigerator first separates the mixed refrigerants with different condensation temperatures through the gas-liquid separation device 3. Then, in the normal cooling mode, the controller 11 controls the second compressor 9 to shut down and controls the reversing device 4 to allow the liquid refrigerant to flow through the refrigeration branch and / or the freezing branch based on the refrigerator's cooling temperature, and controls the start and stop of the first compressor 1. This allows the refrigerator to use a single refrigerant in the normal cooling mode, improving cooling efficiency and reducing noise. Alternatively, in the deep-cold cooling mode, the controller 11 controls the reversing device 4 to allow the liquid refrigerant to flow through the refrigeration branch but not through the freezing branch, and controls the start and stop of the first compressor 1 and the second compressor 9 based on the refrigerator's cooling temperature. This allows the refrigerator to use a refrigerant with a relatively low condensation temperature for deep-cold cooling when the first compressor 1 and the second compressor 9 are on. Since the deep-cold cooling process uses two compressors connected in series for staged compression, the compression ratio of a single compressor can be reduced to improve cooling efficiency and reduce compressor vibration during operation, thereby reducing the refrigerator's operating noise.

[0051] It should be noted that in actual operation, the so-called cryogenic cooling mode usually refers to a cooling mode with a cooling temperature at least below -30℃, such as -30 / -40 / -50℃ cryogenic cooling. The so-called conventional cooling mode usually refers to a cooling mode with a cooling temperature above -30℃.

[0052] As one specific embodiment, the refrigerant used in the refrigerator is a non-azeotropic refrigerant mixture.

[0053] Understandably, the basic refrigeration principle used in this embodiment is as follows: a gas-liquid separation device 3 is installed within the existing dual-system refrigeration cycle system. The gas-liquid separation device 3 separates the mixed refrigerant, allowing it to enter different channels to refrigerate different refrigeration compartments. By opening and closing the reversing device 4 and the second compressor 9, different refrigerants are selected to enter the refrigeration evaporator 8 for refrigeration, thereby achieving different refrigeration requirements.

[0054] Furthermore, the refrigerant used in the refrigerator is a mixed refrigerant composed of R290 and R600a working refrigerants.

[0055] It is worth noting that, compared to existing refrigerators that use a mixture of R290 and R600a refrigerants for refrigeration, in the refrigerator provided in this embodiment, after the mixture of R290 and R600a refrigerants is compressed and discharged by the first compressor 1, the R600a refrigerant is cooled into a liquid state by the first condenser 2, while the R290 refrigerant remains a gas. Therefore, the liquid R600a refrigerant and the gaseous R290 refrigerant can be separated by the gas-liquid separation device 3. In conventional refrigeration mode, R290 refrigerant is stored, and only R600a refrigerant is used for refrigeration to improve refrigeration efficiency. In cryogenic refrigeration mode, R290 refrigerant is used to perform cryogenic refrigeration on the compartments that receive cooling capacity through the refrigeration evaporator 8, and R600a refrigerant is used to refrigerate the compartments that receive cooling capacity through the refrigeration evaporator 6. During the cryogenic refrigeration of the compartments that receive cooling capacity through the refrigeration evaporator 8 using R290 refrigerant, the gaseous R290 separated by the gas-liquid separator 3 is subjected to secondary compression by the second compressor 9. This reduces the number of compressors required, improves refrigeration efficiency, and reduces the vibration and noise generated during compressor operation.

[0056] Understandably, compared to existing solutions using mixed refrigerants, single-refrigerant refrigeration is more efficient, more energy-saving, and quieter.

[0057] For example, see Figure 6Taking a refrigerator using a mixed refrigerant of R290 and R600a as an example, the working principle of the refrigerator in the normal cooling mode in this embodiment is as follows: When the refrigerator is set to the normal cooling mode, the second compressor 9 is in the off state, and the CD circuits of the reversing device 4 are in the open state. At this time, due to the characteristics of the compressor, the refrigerant passing through the compressor can only flow in one direction. Therefore, when the second compressor 9 is not running, the refrigerant on one side of the second condenser 10 cannot flow to side A. At this time, the refrigerant enters the first condenser 2 from the exhaust port of the first compressor 1 for cooling. Since the condensation temperatures of R290 and R600a are different, under this pressure, after entering the first condenser 2 for cooling, the R600a refrigerant cools to a liquid state, while the R290 refrigerant remains a gas. The gas-liquid mixture of refrigerant exiting the first condenser 2 enters the inlet of the gas-liquid separator 3. After separation by the gas-liquid separator 3, the liquid R600a refrigerant is at the bottom of the gas-liquid separator 3, while the gaseous R290 refrigerant is at the top of the gas-liquid separator 3. At this time, since the second compressor 9 is not working, the R290 refrigerant can only accumulate at the top of the gas-liquid separator 3 and inside the second compressor 9. The liquid R600a refrigerant at the bottom enters the inlet of the reversing device 4 from side B, splitting into two paths, C and D. Then, it passes through the first throttling device 5 and the second throttling device 7 respectively, entering the refrigeration evaporator 6 and the freezing evaporator 8, where it evaporates and absorbs heat in different evaporators to cool different compartments. Finally, the R600a refrigerant flowing through the refrigeration evaporator 6 and the freezing evaporator 8 merges together and returns to the suction side on the right side of the first compressor 1. At this point, because the R290 gas continues to accumulate at the top of the gas-liquid separator 3 and the second compressor 9 is off, the R290 refrigerant cannot continue to flow and can only accumulate in the casing of the second compressor 9. After one refrigeration cycle, inside the refrigeration system, the previously mixed refrigerant and R290 have been separated and stored at the top of the gas-liquid separator 3 and inside the compressor casing. At this time, the refrigeration system uses R600a for cooling, which results in high cooling efficiency, low energy consumption, and low noise.

[0058] Further, see Figure 7Taking a refrigerator using a mixture of R290 and R600a refrigerants as an example, the working principle of the refrigerator in the deep cooling mode in this embodiment is as follows: When the refrigerator is set to the deep cooling mode, both the first compressor 1 and the second compressor 9 are on, while the D-path of the reversing device 4 is closed and the C-path is open. At this time, the mixed refrigerant of R290 and R600a enters the first condenser 2 through the exhaust port of the first compressor 1 for cooling. Since the condensation temperatures of R290 and R600a are different, under this pressure, after entering the first condenser 2 for cooling, the R600a refrigerant cools to a liquid state, while the R290 refrigerant remains a gas. The gas-liquid mixture of refrigerant exiting the first condenser 2 enters the inlet of the gas-liquid separator 3. After separation by the gas-liquid separator 3, the liquid R600a refrigerant is at the bottom of the gas-liquid separator 3, while the gaseous R290 refrigerant is at the top. Since the C-path of the reversing device 4 is open, the liquid R600a refrigerant at the bottom enters the inlet of the reversing device 4 from the B side, passes through C, and then passes through the first throttling device 5 to enter the refrigerated evaporator 6. The R290 refrigerant at the top of the gas-liquid separator 3 is a gas and is drawn in by the second compressor 9, where it is compressed again to increase its pressure. It is then cooled by heat dissipation in the second condenser 10. Because the pressure has increased and secondary cooling is performed, the R290 refrigerant is cooled into a liquid state. The liquid R290 refrigerant flows through the second throttling device 7 into the refrigerated evaporator 8, where it evaporates and absorbs heat, using the R290 refrigerant to cool the refrigerated evaporator 8. Understandably, R290 refrigerant has a lower evaporation temperature under the same pressure. Therefore, R290 refrigerant can be used to lower the temperature of the refrigeration evaporator 8 to extremely low levels, achieving deep-cold refrigeration. Finally, the R600a refrigerant flowing through the refrigeration evaporator 6 and the R290 refrigerant flowing through the refrigeration evaporator 8 merge and return to the suction side on the right side of the first compressor 1. After one refrigeration cycle, the separated R600a and R290 refrigerants inside the refrigeration system are remixed and enter the suction side of the first compressor 1, then the next cycle begins. In deep-cold refrigeration mode, the compartment corresponding to the refrigeration evaporator 6 uses R600a for refrigeration, resulting in high efficiency, low energy consumption, and low noise. The compartment corresponding to the refrigeration evaporator 8 uses R290 refrigerant, achieving extremely low temperatures. Furthermore, the two compressors are connected in series for staged compression, resulting in a low compression ratio, high efficiency, and low overall noise.

[0059] As one optional embodiment, the commutation device 4 includes:

[0060] The three-way reversing valve has its first end connected to the liquid phase outlet of the gas-liquid separator 3, its second end connected to the inlet of the refrigeration branch, and its third end connected to the inlet of the freezing branch.

[0061] Furthermore, the three-way directional valve is a three-way electric valve.

[0062] As one optional embodiment, the commutation device 4 includes:

[0063] The first switching valve 41 has its first end connected to the liquid phase outlet of the gas-liquid separator 3 and its second end connected to the inlet of the refrigeration branch.

[0064] The second switching valve 42 has its first end connected to the liquid phase outlet of the gas-liquid separator 3 and its second end connected to the inlet of the refrigeration branch.

[0065] Understandably, see Figure 8 The controller 11 is connected to a first switching valve 41 and a second switching valve 42. The first switching valve 41 is opened or closed under the control of the controller 11. When the first switching valve 41 is open, the liquid phase outlet of the gas-liquid separator 3 is connected to the inlet of the refrigeration branch, so that liquid refrigerant flows through the refrigeration branch. When the second switching valve 42 is closed, the liquid phase outlet of the gas-liquid separator 3 is not connected to the inlet of the refrigeration branch, and liquid refrigerant does not flow into the refrigeration branch. The second switching valve 42 is opened or closed under the control of the controller 11. When the second switching valve 42 is open, the liquid phase outlet of the gas-liquid separator 3 is connected to the inlet of the refrigeration branch, so that liquid refrigerant flows through the refrigeration branch. When the second switching valve 42 is closed, the liquid phase outlet of the gas-liquid separator 3 is not connected to the inlet of the refrigeration branch, and liquid refrigerant does not flow into the refrigeration branch.

[0066] Furthermore, at least one compartment inside the refrigerator is cooled by the refrigeration evaporator 6;

[0067] The refrigerator also includes:

[0068] A refrigeration fan is located around the refrigeration evaporator 6 and is used to deliver the cooling capacity generated by the refrigeration evaporator 6 to the corresponding compartment.

[0069] For example, if the cold compartment is provided with cooling capacity by the refrigeration evaporator 6, the refrigeration fan is used to deliver the cooling capacity generated by the refrigeration evaporator 6 to the cold compartment.

[0070] Furthermore, at least one compartment inside the refrigerator is cooled by a freezer evaporator 8;

[0071] The refrigerator also includes:

[0072] A refrigeration fan is located around the refrigeration evaporator 8 and is used to deliver the cooling capacity generated by the refrigeration evaporator 8 to the corresponding compartment.

[0073] For example, if the freezer compartment is supplied with cooling capacity by the freezer evaporator 8, the freezer fan is used to deliver the cooling capacity generated by the freezer evaporator 8 to the freezer compartment.

[0074] Specifically, the first throttling device 5 is a capillary tube or an expansion valve, and the second throttling device 7 is a capillary tube or an expansion valve.

[0075] As one of the alternative implementation methods, both the refrigerated evaporator 6 and the frozen evaporator 8 are finned evaporators.

[0076] As one optional implementation, the refrigerator's cooling temperature includes a preset refrigeration temperature and a preset freezing temperature. Specifically, see... Figure 9 The refrigerator further includes a first temperature detection device 12 and a second temperature detection device 13; wherein, the first temperature detection device 12 is located in the compartment corresponding to the refrigeration evaporator 6, and is used to detect the first compartment temperature of the compartment corresponding to the refrigeration evaporator 6 in real time; the second temperature detection device 13 is located in the compartment corresponding to the freezer evaporator 8, and is used to detect the second compartment temperature of the compartment corresponding to the freezer evaporator 8 in real time. The controller 11 is connected to the first temperature detection device 12 and the second temperature detection device 13 respectively, to receive the first compartment temperature detected in real time by the first temperature detection device 12 and the second compartment temperature detected in real time by the second temperature detection device 13.

[0077] Then, the reversing device 4 based on the refrigeration temperature control of the refrigerator, which directs the liquid refrigerant to flow through the refrigeration branch and / or the freezing branch, and controls the start and stop of the first compressor 1, includes:

[0078] Based on the refrigeration temperature, determine the refrigeration start-up temperature and the refrigeration shutdown temperature;

[0079] Based on the aforementioned refrigeration and cooling temperatures, determine the refrigeration start-up temperature and the refrigeration shutdown temperature;

[0080] When the temperature of the first compartment is detected to reach the refrigeration start-up temperature, the reversing device 4 is controlled to allow the liquid refrigerant to flow through the refrigeration branch until the temperature of the first compartment is detected to reach the refrigeration stop temperature, at which point the reversing device 4 is controlled to prevent the liquid refrigerant from flowing through the refrigeration branch.

[0081] When the temperature of the second compartment is detected to reach the refrigeration start-up temperature, the reversing device 4 is controlled to allow the liquid refrigerant to flow through the refrigeration branch until the temperature of the second compartment is detected to reach the refrigeration stop temperature, at which point the reversing device 4 is controlled to prevent the liquid refrigerant from flowing through the refrigeration branch.

[0082] When the temperature of the first compartment reaches the refrigeration start-up temperature, or the temperature of the second compartment reaches the freezing start-up temperature, the first compressor 1 is controlled to start, until the temperature of the first compartment reaches the refrigeration stop-up temperature and the temperature of the second compartment reaches the freezing stop-up temperature, the first compressor 1 is controlled to stop.

[0083] It should be noted that the above-mentioned control method based on the refrigeration temperature control reversing device 4 of the refrigerator, which causes the liquid refrigerant to flow through the refrigeration branch and / or the freezing branch, and controls the start and stop of the first compressor 1, is only one optional embodiment. In actual operation, other dual-system refrigeration refrigerators can also refer to the control method of controlling the start and stop of the compressor according to the refrigeration temperature and the control method of refrigerant flow, which are not specifically limited here.

[0084] Furthermore, the refrigeration temperature of the refrigerator also includes a deep-freezing temperature. In an optional embodiment, controlling the reversing device 4 to direct the liquid refrigerant to flow through the refrigeration branch and not through the freezing branch in a preset deep-freezing mode, and controlling the start and stop of the first compressor 1 and the second compressor 9 based on the refrigeration temperature of the refrigerator, includes:

[0085] The control reversing device 4 prevents liquid refrigerant from flowing through the refrigeration branch;

[0086] Based on the cryogenic refrigeration temperature, determine the cryogenic start-up temperature and the cryogenic shutdown temperature;

[0087] When the temperature of the first compartment is detected to reach the refrigeration start-up temperature, the reversing device 4 is controlled to allow the liquid refrigerant to flow through the refrigeration branch until the temperature of the first compartment is detected to reach the refrigeration stop temperature, at which point the reversing device 4 is controlled to prevent the liquid refrigerant from flowing through the refrigeration branch.

[0088] When the temperature of the first compartment reaches the refrigeration start-up temperature, or the temperature of the second compartment reaches the cryogenic start-up temperature, the first compressor 1 is controlled to start, until the temperature of the first compartment reaches the refrigeration stop-up temperature and the temperature of the second compartment reaches the freezing stop-up temperature, the first compressor 1 is controlled to stop.

[0089] When the temperature of the second compartment is detected to reach the cryogenic start-up temperature, the second compressor 9 is controlled to start until the temperature of the second compartment is detected to reach the cryogenic shutdown temperature, at which point the second compressor 9 is controlled to shut down.

[0090] It should be noted that the above-mentioned control method based on the refrigerator's refrigeration temperature control reversing device 4, which causes the liquid refrigerant to flow through the refrigeration branch and not through the freezing branch, and controls the start and stop of the first compressor 1 and the second compressor 9, is only one optional embodiment. In actual operation, other dual-system refrigerators can also refer to the method of controlling the start and stop of the compressor and the direction of refrigerant flow according to the refrigeration temperature in deep cold mode, and are not specifically limited here.

[0091] See Figure 10 This is a flowchart illustrating a refrigeration control method for a refrigerator provided in an embodiment of the present invention.

[0092] The refrigerator refrigeration control method provided in this embodiment includes a primary refrigeration system and a secondary refrigeration system. The primary refrigeration system includes a first compressor, a first condenser, a gas-liquid separator, a reversing device, and a refrigeration branch connected in series to form a loop. A refrigeration branch is connected in parallel to both ends of the refrigeration branch. The reversing device is connected to the liquid phase outlet of the gas-liquid separator, the inlet of the refrigeration branch, and the inlet of the refrigeration branch, respectively. The secondary refrigeration system is located between the gas phase outlet of the gas-liquid separator and the inlet of the refrigeration branch. A second compressor and a second condenser are sequentially arranged on the secondary refrigeration system along the refrigerant flow direction. The method includes the following steps:

[0093] S11. In the preset normal refrigeration mode, control the second compressor to turn off, and control the reversing device to make the liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on the refrigeration temperature of the refrigerator, and control the start and stop of the first compressor.

[0094] S12. In the preset deep-cold refrigeration mode, control the reversing device to make the liquid refrigerant flow through the refrigeration branch and not through the freezing branch, and control the start and stop of the first compressor and the second compressor based on the refrigeration temperature of the refrigerator.

[0095] In the refrigerator refrigeration control method provided in this embodiment, the refrigerator first separates the mixed refrigerants with different condensation temperatures using a gas-liquid separation device. Then, in the normal refrigeration mode, the second compressor is controlled to shut down, and the reversing device is controlled based on the refrigerator's refrigeration temperature to allow the liquid refrigerant to flow through the refrigeration branch and / or the freezing branch, and the first compressor is controlled to start and stop. This allows the use of a single refrigerant for refrigeration in the normal refrigeration mode, improving refrigeration efficiency and reducing noise. Alternatively, in the deep-cold refrigeration mode, the reversing device is controlled to allow the liquid refrigerant to flow through the refrigeration branch but not through the freezing branch, and the first and second compressors are controlled to start and stop based on the refrigerator's refrigeration temperature. This allows the use of a refrigerant with a relatively low condensation temperature for deep-cold refrigeration when the first and second compressors are on. Since two compressors are used in series for staged compression during deep-cold refrigeration, the compression ratio of a single compressor can be reduced to improve refrigeration efficiency and reduce compressor vibration during operation, thereby reducing the refrigerator's operating noise.

[0096] As one optional embodiment, the refrigerant used in the refrigerator is a non-azeotropic refrigerant mixture.

[0097] Specifically, the refrigerant used in the refrigerator is a mixed refrigerant composed of R290 and R600a working refrigerants.

[0098] The specific description of the refrigeration control method of the refrigerator provided in this embodiment can be found in the specific descriptions of the various embodiments of the refrigerator described above, and will not be repeated here.

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

[0100] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator characterized by comprising: The refrigerator comprises: a primary refrigeration system comprising a first compressor, a first condenser, a gas-liquid separation device, a reversing device, a refrigeration branch, and a freezing branch connected in series to form a loop, wherein the freezing branch is connected in parallel to both ends of the refrigeration branch; the reversing device is connected to a liquid phase outlet of the gas-liquid separation device, an inlet of the refrigeration branch, and an inlet of the freezing branch, respectively; the refrigeration branch comprises a first throttling device and a refrigeration evaporator connected in series, and the freezing branch comprises a second throttling device and a freezing evaporator connected in series; a secondary refrigeration system arranged between a gas phase outlet of the gas-liquid separation device and an inlet of the freezing branch, and comprising a second compressor and a second condenser arranged in sequence along a flow direction of refrigerant; a controller configured to: in a preset normal refrigeration mode, control the second compressor to be turned off, control the reversing device to make liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on a refrigeration temperature of the refrigerator, and control the first compressor to be turned on or turned off; in a preset deep refrigeration mode, control the reversing device to make liquid refrigerant flow through the refrigeration branch but not through the freezing branch, and control the first compressor and the second compressor to be turned on or turned off based on the refrigeration temperature of the refrigerator.

2. The refrigerator according to claim 1, wherein The refrigerator uses a non-azeotropic mixed refrigerant as refrigerant.

3. The refrigerator according to claim 1, wherein The refrigerator uses a mixed refrigerant composed of R290 working medium and R600a working medium.

4. The refrigerator according to claim 1, wherein The reversing device comprises: a three-way reversing valve having a first end connected to the liquid phase outlet of the gas-liquid separation device, a second end connected to the inlet of the refrigeration branch, and a third end connected to the inlet of the freezing branch.

5. The refrigerator according to claim 1, wherein The reversing device comprises: a first on-off valve having a first end connected to the liquid phase outlet of the gas-liquid separation device and a second end connected to the inlet of the refrigeration branch; a second on-off valve having a first end connected to the liquid phase outlet of the gas-liquid separation device and a second end connected to the inlet of the freezing branch.

6. The refrigerator according to claim 1, wherein The refrigerator comprises at least one compartment provided with cold energy from the refrigeration evaporator; The refrigerator further comprises: a refrigeration fan arranged around the refrigeration evaporator and configured to deliver cold energy generated by the refrigeration evaporator to a corresponding compartment.

7. The refrigerator according to claim 1, wherein The refrigerator comprises at least one compartment provided with cold energy from the freezing evaporator; The refrigerator further comprises: a freezing fan arranged around the freezing evaporator and configured to deliver cold energy generated by the freezing evaporator to a corresponding compartment.

8. The refrigerator according to claim 1, wherein The first throttling device is a capillary tube or an expansion valve, and the second throttling device is a capillary tube or an expansion valve.

9. The refrigerator according to claim 1, wherein The refrigeration evaporator and the freezing evaporator are both finned evaporators.

10. A method of controlling refrigeration of a refrigerator, characterized by, The refrigerator comprises a primary refrigeration system and a secondary refrigeration system; wherein the primary refrigeration system comprises a first compressor, a first condenser, a gas-liquid separation device, a reversing device, a refrigeration branch, which are connected in series to form a loop, and a freezing branch connected in parallel at both ends of the refrigeration branch; the reversing device is connected with a liquid phase outlet of the gas-liquid separation device, an inlet of the refrigeration branch and an inlet of the freezing branch respectively; the refrigeration branch comprises a first throttling device and a refrigeration evaporator connected in series, and the freezing branch comprises a second throttling device and a freezing evaporator connected in series; the secondary refrigeration system is arranged between a gas phase outlet of the gas-liquid separation device and the inlet of the freezing branch, and comprises a second compressor and a second condenser arranged in sequence along the flow direction of the refrigerant; and the method comprises: in a preset normal refrigeration mode, controlling the second compressor to be closed, controlling the reversing device to make the liquid refrigerant flow through the refrigeration branch and / or the freezing branch based on the refrigeration temperature of the refrigerator, and controlling the opening and stopping of the first compressor; in a preset deep refrigeration mode, controlling the reversing device to make the liquid refrigerant flow through the refrigeration branch without flowing through the freezing branch, and controlling the opening and stopping of the first compressor and the second compressor based on the refrigeration temperature of the refrigerator.

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