A refrigerator and its refrigeration control method

Abstract

This invention discloses a refrigerator and its refrigeration control method. The refrigerator includes a cabinet, a refrigeration system, and a controller. The refrigeration system includes a compressor, a condenser, a gas-liquid separator, a solenoid valve, an electric valve, a first evaporator, and a second evaporator. The controller is configured such that, when the refrigerator is operating in normal refrigeration mode, the solenoid valve is open; the mixed refrigerant enters the gas-liquid separator for separation, and the separated liquid refrigerant enters the first evaporator through the solenoid valve for refrigeration. The separated gaseous refrigerant is stored in the second evaporator for secondary cooling. When the refrigerator is operating in deep refrigeration mode, the solenoid valve is closed; the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant enters the second evaporator for refrigeration. This invention allows for the selection of different refrigerants according to different refrigeration needs, achieving the corresponding refrigeration requirements with a smaller compression ratio, effectively improving refrigeration efficiency and reducing noise during the refrigeration process.

Description

TECHNICAL FIELD

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

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

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

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

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

[0006] a refrigeration system arranged in the cabinet and comprising a compressor, a condenser, a gas-liquid separator, a solenoid valve, an electric valve, a first evaporator and a second evaporator;

[0007] an exhaust port of the compressor is connected with an inlet of the condenser, an outlet of the condenser is connected with an inlet of the gas-liquid separator; the gas-liquid separator is used for separating the mixed refrigerant, a gas outlet end of the gas-liquid separator is connected with an inlet of the second evaporator, and a liquid outlet end of the gas-liquid separator is connected with an inlet of the first evaporator through the solenoid valve; an outlet of the first evaporator and an outlet of the second evaporator are both connected with a suction port of the compressor through the electric valve;

[0008] The controller is configured to control the electromagnetic valve to be in an open state when the refrigerator operates in a normal refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve, and the separated gaseous refrigerant is stored in the second evaporator for secondary cooling.

[0009] When the refrigerator operates in a deep cooling refrigeration mode, the electromagnetic valve is controlled to be in a closed state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant enters the second evaporator for refrigeration.

[0010] The second embodiment of the refrigerator provided by the present application is provided, when the refrigerator operates in a normal refrigeration mode, the electromagnetic valve is in an open state, the first inlet of the electric valve is in a closed state, and the second inlet is in an open state.

[0011] When the refrigerator operates in a deep cooling refrigeration mode, the electromagnetic valve is in a closed state, the first inlet of the electric valve is in a closed state, and the second inlet is in an open state; after a preset time of refrigeration cycle, the first inlet of the electric valve is in an open state, and the second inlet is in a closed state.

[0012] The third embodiment of the refrigerator provided by the present application is provided, the controller is further configured to:

[0013] When the refrigerator operates in a deep cooling refrigeration mode, the electromagnetic valve is controlled to be in a closed state, the first inlet of the electric valve is controlled to be in a closed state, and the second inlet is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant is stored in the second evaporator through the second capillary tube and is subjected to secondary cooling;

[0014] After a preset time of refrigeration cycle, the first inlet of the electric valve is controlled to be in an open state, and the second inlet is controlled to be in a closed state; the separated gaseous refrigerant is liquefied into liquid and enters the second evaporator for refrigeration.

[0015] The fourth embodiment of the refrigerator provided by the present application is provided, the controller is further configured to:

[0016] When the refrigerator operates in a normal refrigeration mode, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve and the first capillary tube, and then enters the suction port of the compressor through the second inlet of the electric valve again.

[0017] The fifth embodiment of the present application provides a refrigerator, wherein the mixed refrigerant is made of R290 refrigerant and R600a refrigerant; the mixed refrigerant sequentially passes through the compressor and the condenser, and then enters the gas-liquid separator for separation; the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0018] The sixth embodiment of the present application provides a refrigerator refrigeration control method, which is applied to a refrigerator comprising a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system comprises a compressor, a condenser, a gas-liquid separator, a solenoid valve, an electric valve, a first evaporator and a second evaporator; the gas-liquid separator is used for separating a mixed refrigerant, the gas outlet end of the gas-liquid separator is connected with the inlet of the second evaporator, the liquid outlet end of the gas-liquid separator is connected with the inlet of the first evaporator through the solenoid valve, and the refrigerator refrigeration control method comprises the following steps:

[0019] When the refrigerator operates in a normal refrigeration mode, the solenoid valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the first evaporator for refrigeration through the solenoid valve, and the separated gaseous refrigerant is stored in the second evaporator and is subjected to secondary cooling;

[0020] When the refrigerator operates in a deep refrigeration mode, the solenoid valve is controlled to be in a closed state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant enters the second evaporator for refrigeration.

[0021] The seventh embodiment of the present application provides a refrigerator refrigeration control method, wherein when the refrigerator operates in a normal refrigeration mode, the solenoid valve is in an open state, the first inlet of the electric valve is in a closed state, and the second inlet is in an open state;

[0022] When the refrigerator operates in a deep refrigeration mode, the solenoid valve is in a closed state, the first inlet of the electric valve is in a closed state, and the second inlet is in an open state; after a refrigeration cycle preset time, the first inlet of the electric valve is in an open state, and the second inlet is in a closed state.

[0023] The eighth embodiment of the present application provides a refrigerator refrigeration control method, wherein the method further comprises:

[0024] When the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve is controlled to be in the closed state, the first inlet of the electric valve is controlled to be in the closed state, and the second inlet is controlled to be in the open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant is stored in the second evaporator for secondary cooling;

[0025] After the refrigeration cycle is preset, the first inlet of the electric valve is controlled to be in the open state, and the second inlet is controlled to be in the closed state; the separated gaseous refrigerant is liquefied into a liquid state and enters the second evaporator for refrigeration.

[0026] The ninth embodiment of the application provides a refrigerator refrigeration control method, and the method further comprises:

[0027] When the refrigerator operates in the normal refrigeration mode, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve and the first capillary tube, and then enters the suction port of the compressor through the second inlet of the electric valve again.

[0028] The tenth embodiment of the application provides a refrigerator refrigeration control method, and the mixed refrigerant is mixed by R290 refrigerant and R600a refrigerant; after the mixed refrigerant sequentially passes through the compressor and the condenser, the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0029] Compared with the prior art, the refrigerator and the refrigeration control method thereof provided by the embodiments of the application have the following beneficial effects: for a single-system refrigerator, in the process of refrigeration using mixed refrigerant, different refrigerants in the system are selected for refrigeration according to different set refrigeration temperatures, and the advantages of different refrigerants are effectively utilized. When the refrigerator operates in the normal refrigeration mode, the mixed refrigerant is no longer used for refrigeration, but the R290 refrigerant is stored, and only the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art, the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in the deep cooling refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, and therefore the R290 refrigerant can be used for refrigeration, and the R600a refrigerant is stored. In the refrigeration process at this time, the suction and discharge side compression ratio of the compressor is smaller than that of other products using single refrigerant, the efficiency is higher, and because the compression ratio is small, the vibration generated by the refrigerator compressor in the working process is small, and the noise of the refrigerator in the overall refrigeration process is low. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0031] Figure 2 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0032] Figure 3 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0033] Figure 4 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0034] Figure 5 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0035] Figure 6 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0036] Figure 7 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0037] Figure 8 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0038] Figure 9 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0039] Figure 10 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0040] Figure 11 is a structural schematic view of a refrigerator provided by an embodiment of the present application;

[0041] Figure 12 is a structural schematic view of a refrigerator provided by an embodiment of the present application; DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0043] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

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

[0045] In the description of the present application, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

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

[0047] The cabinet 10 is a supporting structure of the refrigerator, and a plurality of compartments are arranged inside the cabinet 10;

[0048] The refrigerating system 20 is arranged in the cabinet, and comprises a compressor, a condenser, a gas-liquid separator, a solenoid valve, an electric valve, a first evaporator and a second evaporator;

[0049] The exhaust port of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; the gas-liquid separator is used for separating the mixed refrigerant, the gas outlet end of the gas-liquid separator is connected with the inlet of the second evaporator, and the liquid outlet end of the gas-liquid separator is connected with the inlet of the first evaporator through the solenoid valve; the outlet of the first evaporator and the outlet of the second evaporator are both connected with the suction port of the compressor through the electric valve;

[0050] The controller 30 is configured to control the electromagnetic valve to be in an open state when the refrigerator operates in a normal refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve, and the separated gaseous refrigerant is stored in the second evaporator for secondary cooling;

[0051] The controller 30 is configured to control the electromagnetic valve to be in an open state when the refrigerator operates in a normal refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve, and the separated gaseous refrigerant is stored in the second evaporator for secondary cooling;

[0052] Specifically, the refrigerator provided by the embodiment of the present application comprises a cabinet 10, a refrigeration system 20 and a controller 30. Please refer to Figure 2 and Figure 3 , Figure 2 is a structural schematic diagram of a cabinet of a refrigerator provided by an embodiment of the present application, Figure 3 is a structural schematic diagram of a compartment of a refrigerator provided by an embodiment of the present application. The refrigerator in the embodiment has a shape similar to a cuboid, and comprises a cabinet 10 defining a storage space. The cabinet 10 serves as a support structure of the refrigerator, and is internally provided with a cavity. The cavity comprises a component storage cavity for placing components in the refrigerator, such as a compressor, and a storage space for storing food and the like. The storage space can be divided into a plurality of storage compartments (i.e. compartments), and the storage compartments can be configured as refrigerating compartments 101 and freezing compartments 102 according to different purposes. Each storage compartment is provided with one or more door bodies 200 at an opening thereof, for example, in Figure 2 , the upper storage compartment is a refrigerating compartment, and a double-door body is arranged on the upper storage compartment. The door body 200 comprises a door body outer shell 210 located outside the cabinet 10, a door body inner container 220 located inside the cabinet 10, an upper end cover 230, a lower end cover 240 and a thermal insulation layer located between the door body outer shell 210, the door body inner container 220, the upper end cover 230 and the lower end cover 240. Generally, the thermal insulation layer is filled with foaming material. The door body can be pivotally arranged at the opening of the cabinet, and can also be a drawer type to realize drawer type storage.

[0053] The refrigerator performs refrigeration operation through a refrigeration system to provide cold energy to the compartments to maintain the compartments in a constant low temperature state. Specifically, the refrigeration system of the refrigerator in the embodiment is a single refrigeration system. Please refer to Figure 4 , Figure 4 is a structural schematic diagram of a refrigeration system of a refrigerator provided by an embodiment of the present application. The refrigeration system of the refrigerator provided by the embodiment of the present application comprises a compressor 1, a condenser 2, a gas-liquid separator 3, an electromagnetic valve 4, an electric valve 5, a first evaporator 6 and a second evaporator 7. Please refer toFigure 5 , Figure 5 is a distribution diagram of an evaporator in a refrigeration system of a refrigerator according to an embodiment of the present application. The first evaporator 6 and the second evaporator 7 are arranged in the freezer compartment for refrigerating each compartment. The discharge port of the compressor 1 is connected with the inlet of the condenser 2, and the outlet of the condenser 2 is connected with the inlet of the gas-liquid separator 3. The gas-liquid separator 3 is used for separating the mixed refrigerant, the liquid is at the bottom of the gas-liquid separator 3, and the gas is at the top of the gas-liquid separator 3. The gas outlet end of the gas-liquid separator 3 is connected with the inlet of the second evaporator 7, and the liquid outlet end of the gas-liquid separator 3 is connected with the inlet of the first evaporator 6 through the electromagnetic valve 4. The outlet of the first evaporator 6 and the outlet of the second evaporator 7 are both connected with the suction port of the compressor 1 through the electric valve 5.

[0054] The working constitution of the refrigeration system includes compression process, condensation process, throttling process and evaporation process.

[0055] The compression process is as follows: when the power cord of the refrigerator is plugged in and the refrigerator has a refrigeration demand, the compressor starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor cylinder, compressed into high-temperature and high-pressure superheated gas, and then discharged into the condenser;

[0056] The condensation process is as follows: the high-temperature and high-pressure refrigerant gas is cooled by the condenser, and the temperature is continuously reduced, and gradually cooled into saturated vapor at normal temperature and high pressure, and further cooled into saturated liquid, and the temperature no longer decreases. At this time, the temperature is called the condensation temperature, and the pressure of the refrigerant in the entire condensation process is almost unchanged;

[0057] The throttling process is as follows: the saturated liquid refrigerant after condensation is filtered to remove water and impurities through the dry filter, and then flows into the capillary tube to reduce the pressure through the throttling, and the refrigerant becomes wet vapor at normal temperature and low pressure;

[0058] The evaporation process is as follows: then, the heat absorption and vaporization are started in the evaporator, not only the temperature of the evaporator and its surrounding is reduced, but also the refrigerant is changed into low-temperature and low-pressure gas. The refrigerant discharged from the evaporator returns to the compressor again to repeat the above process, so that the heat in the refrigerator is transferred to the air outside the box, and the purpose of refrigeration is achieved.

[0059] Please refer to Figure 6 and Figure 7 , Figure 6 is a refrigerant flow direction diagram of a refrigerator during ordinary refrigeration according to an embodiment of the present application, Figure 7is a schematic diagram of a valve state of a refrigerator in a normal refrigeration provided by an embodiment of the application. When the refrigerator operates in a normal refrigeration mode, the electromagnetic valve 4 is in an open state, and the D path of the electric valve 5 is opened and the C path is closed. At this time, the mixed refrigerant enters the condenser 2 from the discharge port of the compressor 1 for cooling. Since the mixed refrigerant is composed of two different refrigerants, the condensation temperatures of the different refrigerants are different, and therefore under the pressure at this time, the mixed refrigerant cooled in the condenser 2 is in a liquid state for the R600a refrigerant and is still in a gaseous state for the R290 refrigerant. The gaseous-liquid mixed refrigerant from the outlet of the condenser 2 enters the inlet of the gas-liquid separator 3, and after separation by the gas-liquid separator 3, the liquid refrigerant is at the bottom of the gas-liquid separator 3 and the gaseous refrigerant is at the top of the gas-liquid separator 3. Since the C path of the electric valve 5 is in a closed state, at this time, the separated gaseous refrigerant R290 is stored in the upper part of the gas-liquid separator 3, and the liquid refrigerant R600a at the bottom enters the inlet of the electromagnetic valve 4, then passes through the capillary tube, enters the first evaporator 6, evaporates in the evaporator to absorb heat, cools the compartment, and finally flows out through the D path of the electric valve 5 to return to the suction port on the right side of the compressor. At this time, the separated gaseous refrigerant R290 refrigerant is accumulated in the upper part of the gas-liquid separator 3, then flows along the upper pipeline to the capillary tube and the second evaporator 7, and the second evaporator 7 is also located inside the refrigeration space of the first evaporator 6. Since the C path of the electric valve 5 is in a closed state, at this time, the refrigerant cannot continue to flow and can only accumulate in the second evaporator 7, and the second evaporator 7 is located inside the compartment of the first evaporator 6 and can be cooled twice. At this time, the cooled R290 refrigerant changes from a gaseous state to a liquid state. After one refrigeration cycle, the originally mixed refrigerant R290 in the refrigeration system has been separated and cooled to a liquid state and stored in the second evaporator 7. At this time, the refrigeration system uses R600a for refrigeration, which has high refrigeration efficiency, low energy consumption, and low noise.

[0060] Please refer to Figures 8 to 11 , Figure 8 is a refrigerant flow direction schematic diagram of a refrigerator in a deep refrigeration preparation stage provided by an embodiment of the application, Figure 9 is a valve state schematic diagram of a refrigerator in a deep refrigeration preparation stage provided by an embodiment of the application, Figure 10 is a refrigerant flow direction schematic diagram of a refrigerator in a deep refrigeration provided by an embodiment of the application, Figure 11is a schematic diagram of a valve state of a refrigerator in deep cooling refrigeration provided by an embodiment of the present application. When the refrigerator operates in the deep cooling refrigeration mode, the control solenoid valve 4 is in the closed state, and the D path of the electric valve 5 is in the open state and the C path is in the closed state. At this time, the mixed refrigerant enters the condenser 2 from the discharge port of the compressor 1 for cooling. Since the mixed refrigerant is composed of two different refrigerants, the condensation temperatures of the different refrigerants are different. Therefore, under the pressure at this time, the mixed refrigerant cooled in the condenser 2 is in the liquid state for the R600a refrigerant, and is still in the gas state for the R290 refrigerant. The gas-liquid mixed refrigerant from the outlet of the condenser 2 enters the inlet of the gas-liquid separator 3, and after separation in the gas-liquid separator 3, the liquid refrigerant is at the bottom of the gas-liquid separator 3, and the gaseous refrigerant is at the top of the gas-liquid separator 3. Since the C path of the electric valve 5 is in the closed state at this time, the separated gaseous refrigerant R290 refrigerant passes through the upper part of the gas-liquid separator 3 and accumulates in the second evaporator 7, and the liquid refrigerant R600a refrigerant at the bottom accumulates in the bottom of the gas-liquid separator 3. After 10 minutes of refrigeration cycle, the R600a refrigerant in the refrigeration system is sucked into the left side by the compressor 1 and stored in the bottom of the gas-liquid separator 3. Then the C path of the electric valve 5 is opened, and the D path of the electric valve 5 is closed. At this time, since the R600a refrigerant is almost all stored in the condenser 2 and the gas-liquid separator 3, the pressure is relatively high, and the R290 gas begins to liquefy into a liquid state under the condition of high pressure, and then flows to the second evaporator 7 through the upper pipe A, and evaporates and absorbs heat in the second evaporator 7. At this time, the refrigerant can continue to flow from the C path into the electric valve 5 and then back to the suction port of the compressor 1. At this time, the R290 refrigerant is used as the main refrigerant for refrigeration of the freezer, and the temperature can reach deep cooling. Since most of the R600a refrigerant is stored in the condensing side of the entire refrigeration cycle, the R290 refrigerant that cannot be condensed before can be condensed into a liquid state because the condensing side refrigerant is increased and the pressure is increased, so refrigeration can be performed. Since most of the refrigerant is stored in the left condensing side at this time, the evaporation pressure is low, the R290 evaporation temperature is extremely low, and the refrigerator refrigeration can reach a deep cooling extremely low temperature.

[0061] It should be noted that the R290 refrigerant liquefied into a liquid state will mix with the R600a refrigerant stored in the bottom of the gas-liquid separator, but most of it will not mix. Because the R600a refrigerant is liquefied first and stored in the bottom of the gas-liquid separator, and the gas-liquid separator is a slender structure, the liquid is not easy to exchange inside. The R290 refrigerant is liquefied in the upper part of the gas-liquid separator, and the outlet is also in the upper part, that is, the R290 will flow away from the upper part and will not mix with the lower part. Only the contact surface near the contact surface mixes, but the amount of refrigerant is large, the contact surface position is low, and it will not directly flow out along the top outlet, but the newly entered refrigerant flows in the upper part.

[0062] The embodiment of the present application is used for single system refrigerator, in the process of refrigeration using mixed refrigerant, according to the different refrigeration temperature, the different refrigerant in the system is selected to carry out refrigeration, the advantage of different refrigerant is effectively used. When the refrigerator runs in the normal refrigeration mode, the mixed refrigerant is not used for refrigeration, but the R290 refrigerant is stored, and the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art, the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator runs in the deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, so the R290 refrigerant is used for refrigeration, and the R600a refrigerant is stored. In the refrigeration process, the suction and discharge side compression ratio of the compressor is smaller than that of the single refrigerant used in other products, the efficiency is higher, and because the compression ratio is small, the vibration generated by the compressor in the working process is small, and the noise of the refrigerator in the whole refrigeration process is low.

[0063] As one of the optional embodiments, when the refrigerator runs in the normal refrigeration mode, the electromagnetic valve 4 is in the open state, the first inlet of the electric valve 5 is in the closed state, and the second inlet is in the open state.

[0064] When the refrigerator runs in the deep refrigeration mode, the electromagnetic valve 4 is in the closed state, the first inlet of the electric valve 5 is in the closed state, and the second inlet is in the open state; after the refrigeration cycle is preset, the first inlet of the electric valve 5 is in the open state, and the second inlet is in the closed state.

[0065] Specifically, when the refrigerator operates in the normal refrigeration mode, the electromagnetic valve 4 is in the open state, the first inlet C of the electric valve 5 is in the closed state, and the second inlet D is in the open state. At this time, the gaseous refrigerant R290 separated by the gas-liquid separator 3 is always stored in the upper part of the gas-liquid separator 3, and the liquid refrigerant R600a at the bottom enters the electromagnetic valve 4 inlet, then passes through the capillary tube, enters the first evaporator 6 to evaporate and absorb heat in the evaporator, cools the compartment, and finally flows out through the D path of the electric valve 5, back to the suction port of the right side of the compressor. When the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve 4 is in the closed state, the first inlet C of the electric valve 5 is in the closed state, and the second inlet D is in the open state. The refrigeration cycle is preset for a period of time, and the internal refrigerant is first collected together, and then the first inlet C of the electric valve 5 is controlled to be in the open state and the second inlet D is in the closed state. At this time, since the R600a refrigerant is almost all stored in the condenser 2 and the gas-liquid separator 3, the pressure is large, and the R290 gas begins to liquefy into a liquid state under the condition of large pressure, and then flows to the second evaporator 7 through the upper pipe A. The refrigerant can continue to flow from the C path into the electric valve 5, and then back to the suction port of the compressor 1. At this time, R290 is used as the main refrigerant to refrigerate the freezer, and the deep cooling temperature can be achieved.

[0066] As one of the optional embodiments, the controller is further configured to:

[0067] When the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve 4 is controlled to be in the closed state, the first inlet of the electric valve 5 is controlled to be in the closed state, and the second inlet is controlled to be in the open state. The mixed refrigerant enters the gas-liquid separator 3 for separation, and the separated liquid refrigerant is stored at the bottom of the gas-liquid separator 3. The separated gaseous refrigerant is stored in the second evaporator 7 through the second capillary tube and is cooled again.

[0068] After the refrigeration cycle is preset for a period of time, the first inlet of the electric valve 5 is controlled to be in the open state and the second inlet is controlled to be in the closed state. The separated gaseous refrigerant is liquefied into a liquid state and enters the second evaporator 7 for refrigeration.

[0069] Specifically, when the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve 4 is in the closed state, the first inlet C of the electric valve 5 is in the closed state, and the second inlet D is in the open state. At this time, the mixed refrigerant is discharged from the compressor 1 into the condenser 2 for cooling. Since the mixed refrigerant is composed of two different refrigerants, the condensation temperatures of the different refrigerants are different. Therefore, under the pressure at this time, the mixed refrigerant cooled in the condenser 2 is in the liquid state, and the R290 refrigerant is still in the gaseous state. The gaseous-liquid mixed refrigerant from the outlet of the condenser 2 enters the inlet of the gas-liquid separator 3, and after separation in the gas-liquid separator 3, the liquid refrigerant is at the bottom of the gas-liquid separator 3, and the gaseous refrigerant is at the top of the gas-liquid separator 3. Since the C path of the electric valve 5 is in the closed state at this time, the separated gaseous refrigerant R290 refrigerant passes through the upper part of the gas-liquid separator 3 and accumulates in the second evaporator 7, and the liquid refrigerant R600a refrigerant at the bottom accumulates in the bottom of the gas-liquid separator 3. After 10 minutes of refrigeration cycle, the R600a refrigerant in the refrigeration system is sucked into the left side by the compressor 1 and stored in the bottom of the gas-liquid separator 3, and the refrigerant in the system is collected together, and then the first inlet C of the electric valve 5 is in the open state and the second inlet D is in the closed state. At this time, since the R600a refrigerant is almost entirely stored in the condenser 2 and the gas-liquid separator 3, the pressure is relatively high, and the R290 gas begins to liquefy into a liquid state under the condition of high pressure, and then flows to the second evaporator 7 through the upper pipe A, and evaporates and absorbs heat in the second evaporator 7. At this time, the refrigerant can continue to flow from the C path into the electric valve 5 and then back to the suction port of the compressor 1. At this time, the R290 is used as the main refrigerant for refrigeration of the freezer, and the deep cooling temperature can be achieved.

[0070] As one of the optional embodiments, the controller is further configured to:

[0071] When the refrigerator operates in the ordinary refrigeration mode, the separated liquid refrigerant enters the first evaporator 6 through the electromagnetic valve 4 and the first capillary tube for refrigeration, and then enters the suction port of the compressor 1 again through the second inlet of the electric valve 5.

[0072] Specifically, when the refrigerator operates in the ordinary refrigeration mode, the separated liquid refrigerant enters the first evaporator 6 through the electromagnetic valve 4 and the first capillary tube for refrigeration, and then enters the suction port of the compressor 1 again through the second inlet of the electric valve 5.

[0073] As one of the optional embodiments, the mixed refrigerant is made of R290 refrigerant and R600a refrigerant; after sequentially passing through the compressor and the condenser, the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0074] Specifically, in the embodiment of the present application, the mixed refrigerant is preferably made of R290 refrigerant and R600a refrigerant. After sequentially passing through the compressor 1 and the condenser 2, the mixed refrigerant enters the gas-liquid separator 3 for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0075] Please refer to Figure 12 , Figure 12 is a flowchart of a refrigerator refrigeration control method provided by an embodiment of the present application. The refrigerator refrigeration control method provided by the embodiment of the present application is applied to a refrigerator comprising a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system comprises a compressor, a condenser, a gas-liquid separator, an electromagnetic valve, an electric valve, a first evaporator and a second evaporator; the exhaust port of the compressor is connected with the inlet of the condenser, and the outlet of the condenser is connected with the inlet of the gas-liquid separator; the gas-liquid separator is used for separating a mixed refrigerant, the gaseous outlet end of the gas-liquid separator is connected with the inlet of the second evaporator, and the liquid outlet end of the gas-liquid separator is connected with the inlet of the first evaporator through the electromagnetic valve; the outlet of the first evaporator and the outlet of the second evaporator are both connected with the suction port of the compressor through the electric valve, and the refrigerator refrigeration control method comprises:

[0076] S1, when the refrigerator operates in a normal refrigeration mode, the electromagnetic valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve, and the separated gaseous refrigerant is stored in the second evaporator and is subjected to secondary cooling;

[0077] S2, when the refrigerator operates in a deep cooling refrigeration mode, the electromagnetic valve is controlled to be in a closed state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant enters the second evaporator for refrigeration.

[0078] The embodiment of the present application is used for single system refrigerator, in the process of refrigeration using mixed refrigerant, according to the different refrigeration temperature set, the different refrigerant in the system is selected to carry out refrigeration, the advantage of different refrigerant is effectively used. When the refrigerator runs in the ordinary refrigeration mode, the mixed refrigerant is no longer used for refrigeration, but the R290 refrigerant is stored, and the R600a refrigerant is used for refrigeration. In the ordinary refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art, the single R600a refrigerant is more efficient, more energy-saving, and the noise is smaller. When the refrigerator runs in the deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, so the R290 refrigerant is used for refrigeration, and the R600a refrigerant is stored. In the refrigeration process, the suction and discharge side compression ratio of the compressor is smaller than that of other products using single refrigerant, the efficiency is higher, and because the compression ratio is smaller, the vibration generated by the compressor in the working process is smaller, and the noise of the refrigerator in the whole refrigeration process is lower.

[0079] As one of the optional embodiments, when the refrigerator runs in the ordinary refrigeration mode, the electromagnetic valve is in the open state, the first inlet of the electric valve is in the closed state, and the second inlet is in the open state.

[0080] When the refrigerator runs in the deep refrigeration mode, the electromagnetic valve is in the closed state, the first inlet of the electric valve is in the closed state, and the second inlet is in the open state; after the refrigeration cycle is preset, the first inlet of the electric valve is in the open state, and the second inlet is in the closed state.

[0081] Specifically, when the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is in the open state, the first inlet C of the electric valve is in the closed state, and the second inlet D is in the open state. At this time, the gaseous refrigerant R290 separated by the gas-liquid separator is always stored in the upper part of the gas-liquid separator, and the liquid refrigerant R600a at the bottom enters the electromagnetic valve inlet, then passes through the capillary tube, enters the first evaporator, evaporates in the evaporator to absorb heat, cools the chamber, and finally flows out through the D path of the electric valve to return to the suction port of the right side of the compressor. When the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve is in the closed state, the first inlet C of the electric valve is in the closed state, and the second inlet D is in the open state. After a predetermined time of refrigeration cycle, the internal refrigerant of the system is first collected together, and then the first inlet C of the electric valve is controlled to be in the open state and the second inlet D is controlled to be in the closed state. At this time, since the R600a refrigerant is almost all stored in the condenser and the gas-liquid separator, the pressure is large, and the R290 gas begins to liquefy into a liquid state under the condition of large pressure, and then flows to the second evaporator through the upper pipe A, evaporates in the second evaporator to absorb heat, and the refrigerant can continue to flow into the electric valve from the C path, and then returns to the suction port of the compressor. At this time, R290 is used as the main refrigerant to cool the freezer, and the deep cooling temperature can be achieved.

[0082] As one of the optional embodiments, the method further comprises:

[0083] When the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve is controlled to be in the closed state, the first inlet of the electric valve is controlled to be in the closed state, and the second inlet is controlled to be in the open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant is stored in the second evaporator through the second capillary tube and is cooled again;

[0084] After a predetermined time of refrigeration cycle, the first inlet of the electric valve is controlled to be in the open state and the second inlet is controlled to be in the closed state; the separated gaseous refrigerant is liquefied into a liquid state and enters the second evaporator for refrigeration.

[0085] Specifically, when the refrigerator operates in the deep cooling refrigeration mode, the electromagnetic valve is in the closed state, the first inlet C of the electric valve is in the closed state, and the second inlet D is in the open state. At this time, the mixed refrigerant enters the condenser from the compressor exhaust port for cooling. Since the mixed refrigerant is mixed by two different refrigerants, the condensation temperatures of different refrigerants are different. Therefore, under the pressure at this time, the mixed refrigerant cooled in the condenser is in the liquid state, and the R290 refrigerant is still in the gas state. The gas-liquid mixed refrigerant from the condenser outlet enters the gas-liquid separator inlet, and after separation by the gas-liquid separator, the liquid refrigerant is at the bottom of the gas-liquid separator, and the gaseous refrigerant is at the top of the gas-liquid separator. Since the C path of the electric valve is in the closed state at this time, the separated gaseous refrigerant R290 refrigerant passes through the upper part of the gas-liquid separator and accumulates in the second evaporator, and the liquid refrigerant R600a refrigerant at the bottom accumulates in the gas-liquid separator. After 10 minutes of refrigeration cycle, the R600a refrigerant in the refrigeration system is sucked into the left side by the compressor and stored in the bottom of the gas-liquid separator, and the refrigerants in the system are collected together, and then the first inlet C of the electric valve is in the open state and the second inlet D is in the closed state. At this time, since the R600a refrigerant is almost all stored in the condenser and the gas-liquid separator, the pressure is large, and the R290 gas begins to liquefy into a liquid state under the condition of large pressure, and then flows to the second evaporator through the upper pipe A and evaporates and absorbs heat in the second evaporator. At this time, the refrigerant can continue to flow from the C path into the electric valve and then back to the suction port of the compressor. At this time, the R290 is used as the main refrigerant to refrigerate the freezer, and the deep cooling temperature can be achieved.

[0086] As one of the optional embodiments, the method further comprises:

[0087] When the refrigerator operates in the normal refrigeration mode, the separated liquid refrigerant enters the first evaporator through the electromagnetic valve and the first capillary tube for refrigeration, and then enters the suction port of the compressor again through the second inlet of the electric valve.

[0088] Specifically, when the refrigerator operates in the normal refrigeration mode, the separated liquid refrigerant enters the first evaporator through the electromagnetic valve and the first capillary tube for refrigeration, and then enters the suction port of the compressor again through the second inlet of the electric valve.

[0089] As one of the optional embodiments, the mixed refrigerant is mixed by R290 refrigerant and R600a refrigerant; the mixed refrigerant successively passes through the compressor and the condenser, and then enters the gas-liquid separator for separation. The separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0090] Specifically, the mixed refrigerant in the embodiment of the present application is preferably made of R290 refrigerant and R600a refrigerant. After sequentially passing through the compressor 1 and the condenser 2, the mixed refrigerant enters the gas-liquid separator 3 for separation. The separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

[0091] The embodiment of the present application provides a refrigerator and a refrigeration control method thereof. For a single-system refrigerator, in the process of refrigeration using a mixed refrigerant, different refrigerants inside the system are selected for refrigeration according to different set refrigeration temperatures, and the advantages of different refrigerants are effectively utilized. When the refrigerator operates in a normal refrigeration mode, the mixed refrigerant is no longer used for refrigeration, and R290 refrigerant is stored, and only R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the mixed refrigerant used in the prior art solution, and the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in a deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, and therefore R290 refrigerant can be used for refrigeration, and R600a refrigerant is stored. In the refrigeration process at this time, the suction and discharge side compression ratio of the compressor is smaller than that of the single refrigerant used in other products, and the efficiency is higher. Moreover, because the compression ratio is small, the vibration generated by the compressor during operation is small, and the noise of the refrigerator during the overall refrigeration process is low.

[0092] It should be noted that the system embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, i.e., can be located in one place, or can be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the embodiment of the present application. In addition, the connection relationship between the modules in the system embodiment provided by the present application indicates that there is a communication connection between them, which can be realized as one or more communication buses or signal lines. Those skilled in the art can understand and implement it without creative labor.

[0093] The above describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A refrigerator characterized by comprising: The application relates to a refrigerator, which comprises a box body serving as a support structure of the refrigerator and internally provided with a plurality of compartments; a refrigerating system arranged in the box body and comprising a compressor, a condenser, a gas-liquid separator, an electromagnetic valve, an electric valve, a first evaporator and a second evaporator; an exhaust port of the compressor is connected with an inlet of the condenser, an outlet of the condenser is connected with an inlet of the gas-liquid separator; the gas-liquid separator is used for separating mixed refrigerant, a gas outlet end of the gas-liquid separator is connected with an inlet of the second evaporator, a liquid outlet end of the gas-liquid separator is connected with an inlet of the first evaporator through the electromagnetic valve; an outlet of the first evaporator and an outlet of the second evaporator are both connected with a suction port of the compressor through the electric valve; a controller is configured to control the electromagnetic valve to be in an open state when the refrigerator operates in a normal refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve, and separated gaseous refrigerant is stored in the second evaporator and is subjected to secondary cooling; the controller is configured to control the electromagnetic valve to be in a closed state when the refrigerator operates in a deep refrigeration mode; the mixed refrigerant enters the gas-liquid separator for separation, separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and separated gaseous refrigerant enters the second evaporator for refrigeration. When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is in the open state, a first inlet of the electric valve is in the closed state, and a second inlet is in the open state; when the refrigerator operates in the deep refrigeration mode, the electromagnetic valve is in the closed state, the first inlet of the electric valve is in the closed state, and the second inlet is in the open state; after a preset refrigeration cycle time, the first inlet of the electric valve is in the open state, and the second inlet is in the closed state. The controller is further configured to: when the refrigerator operates in the deep refrigeration mode, control the electromagnetic valve to be in the closed state, control the first inlet of the electric valve to be in the closed state, and control the second inlet to be in the open state; the mixed refrigerant enters the gas-liquid separator for separation, separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and separated gaseous refrigerant is stored in the second evaporator through a second capillary tube and is subjected to secondary cooling; after a preset refrigeration cycle time, control the first inlet of the electric valve to be in the open state, and control the second inlet to be in the closed state; separated gaseous refrigerant is liquefied into liquid and enters the second evaporator for refrigeration. The controller is further configured to: when the refrigerator operates in the normal refrigeration mode, separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve and a first capillary tube, and then enters the suction port of the compressor through the second inlet of the electric valve again. ​ ​ 2. The refrigerator according to claim 1, wherein ​ ​ ​ 3. The refrigerator according to claim 2, wherein ​ ​ ​ 4. The refrigerator according to claim 3, wherein ​ ​ 5. The refrigerator according to claim 4, wherein The mixed refrigerant is made of R290 refrigerant and R600a refrigerant; after sequentially passing through the compressor and the condenser, the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

6. A method of controlling refrigeration of a refrigerator, characterized by, The method is applied to a refrigerator comprising a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system comprises a compressor, a condenser, a gas-liquid separator, an electromagnetic valve, an electric valve, a first evaporator and a second evaporator; the gas-liquid separator is used for separating the mixed refrigerant, a gas outlet end of the gas-liquid separator is connected with an inlet of the second evaporator, a liquid outlet end of the gas-liquid separator is connected with an inlet of the first evaporator through the electromagnetic valve, and the refrigerator refrigeration control method comprises: When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve, and the separated gaseous refrigerant is stored in the second evaporator and is subjected to secondary cooling; When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve is controlled to be in a closed state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant enters the second evaporator for refrigeration.

7. The method of claim 6, wherein the cooling of the refrigerator is controlled by the controller based on the temperature of the refrigerator and the temperature of the ice bank. When the refrigerator operates in the normal refrigeration mode, the electromagnetic valve is in an open state, the first inlet of the electric valve is in a closed state, and the second inlet is in an open state; When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve is in a closed state, the first inlet of the electric valve is in a closed state, and the second inlet is in an open state; After a preset refrigeration cycle time, the first inlet of the electric valve is in an open state, and the second inlet is in a closed state.

8. The method of claim 7, wherein the cooling of the refrigerator is controlled by the controller based on the temperature of the refrigerator and the temperature of the ice maker. The method further comprises: When the refrigerator operates in the deep refrigeration mode, the electromagnetic valve is controlled to be in a closed state, the first inlet of the electric valve is controlled to be in a closed state, and the second inlet is controlled to be in an open state; the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is stored at the bottom of the gas-liquid separator, and the separated gaseous refrigerant is stored in the second evaporator through a second capillary tube and is subjected to secondary cooling; After a preset refrigeration cycle time, the first inlet of the electric valve is controlled to be in an open state, and the second inlet is controlled to be in a closed state; the separated gaseous refrigerant is liquefied into liquid and enters the second evaporator for refrigeration.

9. The method of claim 8, wherein the cooling of the refrigerator is controlled by the controller based on the temperature of the refrigerator and the temperature of the ice maker. The method further comprises: When the refrigerator operates in the normal refrigeration mode, after the separated liquid refrigerant enters the first evaporator for refrigeration through the electromagnetic valve and a first capillary tube, the separated liquid refrigerant is introduced into the suction port of the compressor again through the second inlet of the electric valve.

10. The method of claim 9, wherein the cooling of the refrigerator is controlled by the controller based on the temperature of the refrigerator and the temperature of the ice maker. The mixed refrigerant is made by mixing R290 refrigerant and R600a refrigerant; after sequentially passing through the compressor and the condenser, the mixed refrigerant enters the gas-liquid separator for separation, the separated liquid refrigerant is R600a refrigerant, and the separated gaseous refrigerant is R290 refrigerant.

Images