Refrigerator and refrigeration control method thereof

Abstract

The application discloses a refrigerator and a refrigeration control method thereof. The refrigerator comprises a cabinet, a refrigeration system and a controller. The refrigeration system comprises a first refrigeration system and a second refrigeration system. The controller is configured to: when the refrigerator operates normal refrigeration, the first refrigeration system operates, and R600a refrigerant enters a refrigeration evaporator, a temperature-variable evaporator and a freezing evaporator to perform refrigeration; when the refrigerator operates deep refrigeration, the first refrigeration system and the second refrigeration system operate simultaneously; R600a refrigerant enters the refrigeration evaporator and the temperature-variable evaporator to perform refrigeration; and R290 refrigerant enters the second evaporator to perform refrigeration on the freezing chamber. For a three-system refrigerator, the application uses a double-compressor double-refrigeration system, two refrigeration systems use different refrigerants, whether the second refrigeration system is started can be selected according to different refrigeration requirements, and the second refrigeration system can adopt a smaller compression ratio to realize corresponding refrigeration requirements due to the cascade effect, thereby effectively improving the refrigeration efficiency and reducing the noise in the refrigeration process.

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] Current refrigerator refrigeration systems typically use R290 refrigerant or a mixture of refrigerants to achieve deep-cold cooling. However, existing systems can only operate under a single condition and cannot change the refrigerant used for different cooling cycles. Refrigerators using a mixture of refrigerants use R600a refrigerant to cool R290 refrigerant in deep-cold mode, then use R290 refrigerant to cool the freezer compartment, while other compartments are cooled by R600a refrigerant. In normal operation, existing systems use a mixture of R600a and R290 refrigerants to cool the compartments, resulting in a high compression ratio, high energy consumption, and low cooling efficiency. Furthermore, the high compression ratio causes greater vibration from the refrigerator compressor during operation, leading to higher noise levels throughout the overall cooling process. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a refrigerator and its refrigeration control method. For a three-system refrigerator, a dual-compressor dual-refrigeration system is used. The two refrigeration systems use different refrigerants. The second refrigeration system can be turned on or off according to different refrigeration needs. Due to the cascading effect, the second refrigeration system can achieve the corresponding refrigeration needs with a smaller compression ratio, effectively improving refrigeration efficiency and reducing noise during the refrigeration process.

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

[0005] The cabinet, which serves as the supporting structure of the refrigerator, has several compartments inside;

[0006] A refrigeration system, which is located inside the box, includes a first refrigeration system and a second refrigeration system;

[0007] The first refrigeration system includes a first compressor, a first condenser, an electric valve, a refrigerated evaporator, a variable-temperature evaporator, and a frozen evaporator; the second refrigeration system includes a second compressor, a second condenser, and a second evaporator; wherein, the first refrigeration system uses R600a refrigerant, and the second refrigeration system uses R290 refrigerant;

[0008] The discharge port of the first compressor is connected to the inlet of the first condenser, and the outlet of the first condenser is connected to the electric valve. The electric valve is used to divide the R600a refrigerant into three paths, which enter different refrigeration pipelines respectively.

[0009] An exhaust port of the second compressor is connected with an inlet of the second condenser, an outlet of the second condenser is connected with an inlet of the second evaporator, and an outlet of the second evaporator is connected with a suction port of the second compressor;

[0010] The controller is configured to control the first refrigeration system to operate when the refrigerator operates in a normal refrigeration mode; and the R600a refrigerant sequentially passes through the first compressor and the first condenser, and then enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator through the electric valve for refrigeration.

[0011] The controller is configured to control the first refrigeration system and the second refrigeration system to operate simultaneously when the refrigerator operates in a deep refrigeration mode; the R600a refrigerant sequentially passes through the first compressor and the first condenser, and then enters the refrigeration evaporator and the variable-temperature evaporator through the electric valve for refrigeration; and the R290 refrigerant sequentially passes through the second compressor and the second condenser, and then enters the second evaporator for refrigeration of the freezing chamber.

[0012] The refrigerator provided by the second embodiment of the present application comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline.

[0013] The first refrigeration pipeline is connected with a first outlet of the electric valve, passes through a first capillary and the refrigeration evaporator, and then enters a suction port of the first compressor.

[0014] The second refrigeration pipeline is connected with a second outlet of the electric valve, passes through a second capillary and the variable-temperature evaporator, and then enters the suction port of the first compressor.

[0015] The third refrigeration pipeline is connected with a third outlet of the electric valve, passes through a third capillary and the freezing evaporator, and then enters the suction port of the first compressor.

[0016] The refrigerator provided by the third embodiment of the present application comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline.

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

[0018] The refrigerator provided by the fourth embodiment of the present application comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline.

[0019] The fifth embodiment of the present application provides a refrigerator, wherein the second condenser and the temperature-variable evaporator are oppositely arranged to allow heat exchange between the second condenser and the temperature-variable evaporator; the second evaporator and the freezing evaporator are oppositely arranged to allow heat exchange between the second evaporator and the freezing evaporator; and the R290 refrigerant is cooled by the temperature-variable evaporator when passing through the second condenser.

[0020] The sixth embodiment of the present application provides a refrigerator refrigeration control method, which is applied to a refrigerator comprising a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system comprises a first refrigeration system and a second refrigeration system; the first refrigeration system comprises a first compressor, a first condenser, an electric valve, a refrigerating evaporator, a temperature-variable evaporator and a freezing evaporator; the second refrigeration system comprises a second compressor, a second condenser and a second evaporator; wherein the first refrigeration system adopts R600a refrigerant, and the second refrigeration system adopts R290 refrigerant; the electric valve is used to divide the R600a refrigerant into three paths to enter different refrigeration pipelines respectively; and the refrigerator refrigeration control method comprises:

[0021] when the refrigerator operates in a normal refrigeration mode, the first refrigeration system is controlled to operate; the R600a refrigerant sequentially passes through the first compressor and the first condenser, and then enters the refrigerating evaporator, the temperature-variable evaporator and the freezing evaporator through the electric valve to perform refrigeration;

[0022] when the refrigerator operates in a deep refrigeration mode, the first refrigeration system and the second refrigeration system are controlled to operate simultaneously; the R600a refrigerant sequentially passes through the first compressor and the first condenser, and then enters the refrigerating evaporator and the temperature-variable evaporator through the electric valve to perform refrigeration; and the R290 refrigerant sequentially passes through the second compressor and the second condenser, and then enters the second evaporator to perform refrigeration on the freezing compartment.

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

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

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

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

[0027] The eighth embodiment of the present application provides a refrigerator refrigeration control method, when the refrigerator operates in a normal refrigeration mode, the first outlet, the second outlet and the third outlet of the electric valve are all in an open state.

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

[0029] The ninth embodiment of the present application provides a refrigerator refrigeration control method, the outlet of the refrigeration evaporator, the outlet of the temperature-variable evaporator and the outlet of the freezing evaporator are all connected with the suction port of the first compressor; the R600a refrigerant passes through the refrigeration evaporator, the temperature-variable evaporator and the freezing evaporator, and then is combined together and enters the suction port of the first compressor again.

[0030] The tenth embodiment of the present application provides a refrigerator refrigeration control method, the second condenser and the temperature-variable evaporator are oppositely arranged to make the second condenser and the temperature-variable evaporator exchange heat with each other; the second evaporator and the freezing evaporator are oppositely arranged to make the second evaporator and the freezing evaporator exchange heat with each other; when the R290 refrigerant passes through the second condenser, the temperature-variable evaporator cools the R290 refrigerant.

[0031] Compared with the prior art, the refrigerator and the refrigeration control method thereof provided by the embodiment of the present application have the beneficial effects that: for a three-system refrigerator, a double-compressor double-refrigeration system is used, two refrigeration systems use different refrigerants, and whether to start the second refrigeration system can be selected according to different refrigeration requirements, so that the advantages of different refrigerants can be effectively utilized. Moreover, due to the cascade effect, the second refrigeration system can realize the corresponding refrigeration requirement by using a smaller compression ratio, thereby effectively improving the refrigeration efficiency and reducing the noise in the refrigeration process. When the refrigerator operates in the normal refrigeration mode, the freezer chamber is no longer refrigerated by using the R290 refrigerant, but the R290 refrigeration system is turned off, and the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the prior art scheme using cascade refrigeration, and the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in the deep refrigeration mode, the freezer chamber needs to reach a lower refrigeration temperature, so the refrigerator freezer chamber uses the R290 refrigerant for refrigeration, and the other compartments of the refrigerator still use the R600a refrigerant for refrigeration. In the refrigeration process at this time, the suction and discharge side compression ratio of the compressor is smaller than that of other products using a single refrigerant, the efficiency is higher, and because the compression ratio is small, the vibration generated by the compressor in the working process is small, and the noise of the refrigerator in the overall refrigeration process is low. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a structural schematic diagram of a refrigerator provided by an embodiment of the present application;

[0033] Figure 2 is a structural schematic diagram of a refrigerator provided by an embodiment of the present application;

[0034] Figure 3 is a structural schematic diagram of a refrigerator provided by an embodiment of the present application;

[0035] Figure 4 is a structural schematic diagram of a refrigerator provided by an embodiment of the present application;

[0036] Figure 5 is a distribution schematic diagram of an evaporator in a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0037] Figure 6 is a position schematic diagram of a second condenser in a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0038] Figure 7 is a position schematic diagram of a second evaporator in a refrigeration system of a refrigerator provided by an embodiment of the present application;

[0039] Figure 8is a refrigerant flow direction schematic diagram of a refrigerator in normal refrigeration provided by an embodiment of the present application;

[0040] Figure 9 is a refrigerant flow direction schematic diagram of a refrigerator in deep refrigeration provided by an embodiment of the present application;

[0041] Figure 10 is a flow schematic diagram of a refrigerator refrigeration control method provided by an embodiment of the present application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only intended to facilitate the description of the present application and simplify 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 "multiple" is two or more.

[0045] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of 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 structure schematic diagram of a refrigerator provided by an embodiment of the present application. The refrigerator provided in the embodiment of the present application comprises:

[0047] A box body 100, which is a support structure of a refrigerator, is internally provided with a plurality of compartments;

[0048] A refrigeration system 20 is arranged in the box body and comprises a first refrigeration system and a second refrigeration system;

[0049] The first refrigeration system comprises a first compressor, a first condenser, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator; the second refrigeration system comprises a second compressor, a second condenser and a second evaporator; wherein the first refrigeration system adopts R600a refrigerant, and the second refrigeration system adopts R290 refrigerant;

[0050] An exhaust port of the first compressor is connected with an inlet of the first condenser, an outlet of the first condenser is connected with the electric valve, and the electric valve is used for dividing the R600a refrigerant into three paths and entering different refrigeration pipelines respectively;

[0051] An exhaust port of the second compressor is connected with an inlet of the second condenser, an outlet of the second condenser is connected with an inlet of the second evaporator, and an outlet of the second evaporator is connected with a suction port of the second compressor;

[0052] A controller 30 is configured to control the first refrigeration system to operate when the refrigerator operates in a normal refrigeration mode; the R600a refrigerant sequentially passes through the first compressor and the first condenser and then enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator through the electric valve for refrigeration respectively;

[0053] When the refrigerator operates in a deep refrigeration mode, the first refrigeration system and the second refrigeration system are controlled to operate simultaneously; the R600a refrigerant sequentially passes through the first compressor and the first condenser and then enters the refrigeration evaporator and the variable-temperature evaporator through the electric valve for refrigeration respectively; and the R290 refrigerant sequentially passes through the second compressor and the second condenser and then enters the second evaporator for refrigeration of the freezing compartment.

[0054] Specifically, the refrigerator provided by the embodiment of the present application comprises a box body 100, a refrigeration system 20 and a controller 30. Please refer to Figure 2 and Figure 3 , Figure 2 is a structural schematic view of a box body of a refrigerator provided by an embodiment of the present application, Figure 3is a structure diagram of a chamber of a refrigerator according to an embodiment of the present application. The refrigerator in this embodiment has a shape similar to a cuboid, and includes a cabinet 100 defining a storage space. The cabinet 100 serves as a support structure of the refrigerator, and has a cavity inside. The cavity includes 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 multiple storage chambers (i.e., chambers), which can be configured as a refrigeration chamber 101, a variable-temperature chamber 102 (also referred to as a fresh-keeping chamber), and a freezing chamber 103 according to different purposes. Each storage chamber is provided with one or more door bodies 200 at an opening thereof, for example, in Figure 2 the upper storage chamber is a refrigeration chamber, and a double-door body is provided on the upper storage chamber. The door body 200 includes a door body outer shell 210 located outside the cabinet 100, a door body inner liner 220 located inside the cabinet 100, 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 liner 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, or can be a drawer type to achieve drawer type storage.

[0055] The refrigerator performs a refrigeration operation through a refrigeration system, and provides cold energy to the chambers to maintain the chambers at a constant low temperature. Specifically, the refrigeration system of the refrigerator in this embodiment is a three-refrigeration system with double compressors. Please refer to Figure 4 , Figure 4 is a structure diagram of a refrigeration system of a refrigerator according to an embodiment of the present application. The refrigeration system of the refrigerator in this embodiment includes a first refrigeration system and a second refrigeration system. The first refrigeration system includes a first compressor 1, a first condenser 2, an electric valve 3, a refrigeration evaporator 4, a variable-temperature evaporator 5, and a freezing evaporator 6. The second refrigeration system includes a second compressor 7, a second condenser 8, and a second evaporator 9. The first refrigeration system uses R600a refrigerant, and the second refrigeration system uses R290 refrigerant. Please refer to Figure 5 , Figure 5 is a distribution diagram of evaporators in a refrigeration system of a refrigerator according to an embodiment of the present application. The refrigeration evaporator 4, the variable-temperature evaporator 5, and the freezing evaporator 6 are respectively arranged inside the corresponding chambers to perform refrigeration on the chambers. That is, the refrigeration evaporator 4 is arranged inside the refrigeration chamber 101 to perform refrigeration on the refrigeration chamber 101, the variable-temperature evaporator 5 is arranged inside the variable-temperature chamber 102 to perform refrigeration on the variable-temperature chamber 102, and the freezing evaporator 6 is arranged inside the freezing chamber 103 to perform refrigeration on the freezing chamber 103. It should be noted that, since the second refrigeration system is used to perform refrigeration on the freezing chamber, the second evaporator 9 is arranged inside the freezing chamber 103. Please refer to Figure 6 and Figure 7 , Figure 6is a position diagram of a second condenser in a refrigeration system of a refrigerator provided by an embodiment of the present application, Figure 7 is a position diagram of a second evaporator in a refrigeration system of a refrigerator provided by an embodiment of the present application. The second condenser 8 and the temperature-variable evaporator 5 are oppositely arranged to exchange heat between the second condenser 8 and the temperature-variable evaporator 5; the second evaporator 9 and the freezing evaporator 6 are oppositely arranged to exchange heat between the second evaporator 9 and the freezing evaporator 6; and the R290 refrigerant is cooled by the temperature-variable evaporator 5 when passing through the second condenser 8. The exhaust port of the first compressor 1 is connected with the inlet of the first condenser 2, the outlet of the first condenser 2 is connected with the electric valve 3, the electric valve 3 is used for dividing the R600a refrigerant into three paths A, B and C, and the three paths are combined together to return to the suction port of the compressor. The exhaust port of the second compressor 7 is connected with the inlet of the second condenser 8, the outlet of the second condenser 8 is connected with the inlet of the second evaporator 9, and the outlet of the second evaporator 9 is connected with the suction port of the second compressor 7.

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

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

[0058] The condensation process is as follows: the high-temperature and high-pressure refrigerant gas is cooled by the condenser, the temperature is continuously lowered, and the refrigerant is 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;

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

[0060] The evaporation process is as follows: then the refrigerant starts to absorb heat in the evaporator to vaporize, not only lowers the temperature of the evaporator and its surrounding, but also changes the refrigerant into low-temperature and low-pressure gas. The refrigerant discharged from the evaporator returns to the compressor again to repeat the above process, so as to transfer the heat in the refrigerator to the air outside the refrigerator, and achieve the purpose of refrigeration.

[0061] Please refer to Figure 8 , Figure 8is an embodiment of the present application provides a refrigerator in the general refrigeration refrigerant flow direction schematic diagram. When the refrigerator runs in the general refrigeration mode, control the first refrigeration system runs. At this time the refrigerant from the first compressor 1 exhaust port into the first condenser 2 cooling, from the first condenser 2 outlet R600a refrigerant into the electric valve 3 inlet, divided into A, B, C three ways, respectively through the capillary, into the refrigeration evaporator 4, variable temperature evaporator 5 and freezer evaporator 6, respectively in different evaporator evaporation heat absorption, cooling, the last together, back to the suction port of the right side of the compressor. Such cycle to cycle refrigeration cycle, refrigeration. At this time the refrigeration system using R600a refrigeration, high efficiency, low energy consumption, low noise.

[0062] Please refer to Figure 9 , Figure 9 is an embodiment of the present application provides a refrigerator in the deep cooling refrigeration refrigerant flow direction schematic diagram. When the refrigerator runs in the deep cooling refrigeration mode, control the first refrigeration system and the second refrigeration system runs simultaneously. At this time the refrigerant from the first compressor 1 exhaust port into the first condenser 2 cooling, from the first condenser 2 outlet R600a refrigerant into the electric valve 3 inlet, divided into A, B, respectively through the capillary, into the refrigeration evaporator 4 and variable temperature evaporator 5, respectively in different evaporator evaporation heat absorption, cooling, the last together, back to the suction port of the right side of the compressor. At this time the electric valve C road for the closed state, while the second refrigeration system refrigeration, the second refrigeration system using R290 refrigerant, the second condenser 8 is located in the variable temperature evaporator 5 position, by the variable temperature evaporator 5 cooling, can be cooled to a relatively low temperature, at this time the R290 refrigerant is liquid, after the left side of the capillary, into the second evaporator 9 in the freezer room, evaporation heat absorption, because the R290 refrigerant evaporation temperature is low, therefore can be reduced to very low temperature freezer room, such cycle to cycle refrigeration cycle, refrigeration. It should be noted that the first refrigeration system power is much greater than the second refrigeration system, can meet the refrigeration of refrigeration chamber and variable temperature room, while also can be cooled to the second condenser 8. At this time the refrigeration system in the refrigeration chamber and variable temperature room using R600a refrigeration, high efficiency, low energy consumption, low noise, while the freezer room using R290 refrigerant refrigeration, can achieve deep cooling extremely low temperature.

[0063] The embodiment of the present application uses a double-compressor double-refrigeration system for a three-system refrigerator, two refrigeration systems use different refrigerants, and whether to start the second refrigeration system can be selected according to different refrigeration requirements, so that the advantages of different refrigerants can be effectively utilized. Moreover, due to the cascade effect, the second refrigeration system can use a smaller compression ratio to achieve the corresponding refrigeration requirement, effectively improving the refrigeration efficiency and reducing the noise in the refrigeration process. When the refrigerator operates in the normal refrigeration mode, the freezer chamber is no longer refrigerated by the R290 refrigerant, but the R290 refrigeration system is turned off, and the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the existing technical solution using cascade refrigeration, and the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in the deep refrigeration mode, the freezer chamber needs to reach a lower refrigeration temperature, so the refrigerator freezer chamber uses the R290 refrigerant for refrigeration, and the other compartments of the refrigerator still use the R600a refrigerant for refrigeration. At this time, in the refrigeration process, the suction and discharge side compression ratio of the compressor is smaller than that of other products using a single refrigerant, the efficiency is higher, and because the compression ratio is smaller, the vibration generated by the refrigerator compressor during operation is smaller, and the noise of the refrigerator during the overall refrigeration process is lower.

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

[0065] The first refrigeration pipeline is connected with the first outlet of the electric valve 3, passes through the first capillary 10 and the refrigeration evaporator 4, and is connected with the suction port of the first compressor 1.

[0066] The second refrigeration pipeline is connected with the second outlet of the electric valve 3, passes through the second capillary 11 and the variable-temperature evaporator 5, and is connected with the suction port of the first compressor 1.

[0067] The third refrigeration pipeline is connected with the third outlet of the electric valve 3, passes through the third capillary 12 and the freezing evaporator 6, and is connected with the suction port of the first compressor 1.

[0068] Specifically, in the embodiment of the present application, the electric valve 3 is used to divide the R600a refrigerant into three paths A, B and C, which are respectively connected with different refrigeration pipelines. The refrigeration pipeline comprises a first refrigeration pipeline A, a second refrigeration pipeline B and a third refrigeration pipeline C. The first refrigeration pipeline is connected with the first outlet of the electric valve 3, passes through the first capillary 10 and the refrigeration evaporator 4, and is connected with the suction port of the first compressor 1. The second refrigeration pipeline is connected with the second outlet of the electric valve 3, passes through the second capillary 11 and the variable-temperature evaporator 5, and is connected with the suction port of the first compressor 1. The third refrigeration pipeline is connected with the third outlet of the electric valve 3, passes through the third capillary 12 and the freezing evaporator 6, and is connected with the suction port of the first compressor 1.

[0069] As one of the optional embodiments, when the refrigerator operates in the normal refrigeration mode, the first outlet, the second outlet and the third outlet of the electric valve are in the open state.

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

[0071] Specifically, when the refrigerator operates in the normal refrigeration mode, the first outlet, the second outlet and the third outlet of the electric valve 3 are in the open state. The refrigerant enters the first condenser 2 from the exhaust port of the first compressor 1 for cooling. The R600a refrigerant from the outlet of the first condenser 2 enters the inlet of the electric valve 3, is divided into three paths A, B and C, respectively passes through the capillary, enters the refrigeration evaporator 4, the temperature-variable evaporator 5 and the freezing evaporator 6, respectively evaporates and absorbs heat in different evaporators, and cools different compartments. Finally, they are combined together and returned to the suction port on the right side of the compressor. When the refrigerator operates in the deep refrigeration mode, the first outlet and the second outlet of the electric valve 3 are in the open state, and the third outlet is in the closed state. The refrigerant enters the first condenser 2 from the exhaust port of the first compressor 1 for cooling. The R600a refrigerant from the outlet of the first condenser 2 enters the inlet of the electric valve 3, is divided into two paths A and B, respectively passes through the capillary, enters the refrigeration evaporator 4 and the temperature-variable evaporator 5, respectively evaporates and absorbs heat in different evaporators, and cools different compartments. Finally, they are combined together and returned to the suction port on the right side of the compressor. At this time, the electric valve C path is in the closed state, and the second refrigeration system is started to perform refrigeration. The second refrigeration system uses R290 refrigerant, and the second condenser 8 is located at the position of the temperature-variable evaporator 5. After being cooled by the temperature-variable evaporator 5, the R290 refrigerant can be cooled to a relatively low temperature. At this time, the R290 refrigerant is in a liquid state, enters the second evaporator 9 inside the freezing chamber after passing through the left capillary, and evaporates and absorbs heat. Because the evaporation temperature of the R290 refrigerant is low, the temperature of the freezing chamber can be lowered to a very low temperature. This cycle is repeated to perform a refrigeration cycle to cool the refrigerator.

[0072] As one of the optional embodiments, the outlet of the refrigeration evaporator 4, the outlet of the temperature-variable evaporator 5 and the outlet of the freezing evaporator 6 are connected with the suction port of the first compressor 1. After passing through the refrigeration evaporator 4, the temperature-variable evaporator 5 and the freezing evaporator 6, the R600a refrigerant is combined together and then enters the suction port of the first compressor 1.

[0073] Specifically, the outlet of the refrigeration evaporator 4, the outlet of the variable-temperature evaporator 5 and the outlet of the freezing evaporator 6 are connected with the suction port of the first compressor 1, and the R600a refrigerant is merged after passing through the refrigeration evaporator 4, the variable-temperature evaporator 5 and the freezing evaporator 6 and then enters the suction port of the first compressor 1 again.

[0074] As one of the optional embodiments, the second condenser 8 and the variable-temperature evaporator 5 are oppositely arranged to exchange heat between the second condenser 8 and the variable-temperature evaporator 5, and the second evaporator 9 and the freezing evaporator 6 are oppositely arranged to exchange heat between the second evaporator 9 and the freezing evaporator 6, and the R290 refrigerant is cooled by the variable-temperature evaporator 5 when passing through the second condenser 8.

[0075] Specifically, the second condenser 8 and the variable-temperature evaporator 5 are oppositely arranged to exchange heat between the second condenser 8 and the variable-temperature evaporator 5, and the R290 refrigerant is cooled by the variable-temperature evaporator 5 when passing through the second condenser 8, and can be cooled to a relatively low temperature, at which the R290 refrigerant is in a liquid state. The second evaporator 9 and the freezing evaporator 6 are oppositely arranged to exchange heat between the second evaporator 9 and the freezing evaporator 6.

[0076] Please refer to Figure 10 , Figure 10 is a flowchart of a refrigerator refrigeration control method provided by an embodiment of the present application. The refrigerator refrigeration control method provided by the embodiment of the present application is applied to a refrigerator including a cabinet and a refrigeration system; wherein the cabinet is internally provided with a plurality of compartments, and the refrigeration system includes a first refrigeration system and a second refrigeration system; the first refrigeration system includes a first compressor, a first condenser, an electric valve, a refrigeration evaporator, a variable-temperature evaporator and a freezing evaporator; the second refrigeration system includes a second compressor, a second condenser and a second evaporator; wherein the first refrigeration system adopts R600a refrigerant, and the second refrigeration system adopts R290 refrigerant; the exhaust port of the first compressor is connected with the inlet of the first condenser, the outlet of the first condenser is connected with the electric valve, the electric valve is used for dividing the R600a refrigerant into three paths and entering different refrigeration pipelines respectively; the exhaust port of the second compressor is connected with the inlet of the second condenser, the outlet of the second condenser is connected with the inlet of the second evaporator, the outlet of the second evaporator is connected with the suction port of the second compressor, and the refrigerator refrigeration control method includes:

[0077] S1, when the refrigerator runs in the normal refrigeration mode, the first refrigeration system is controlled to run; the R600a refrigerant sequentially passes through the first compressor and the first condenser, and then enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator through the electric valve for refrigeration;

[0078] S2, when the refrigerator runs in the deep refrigeration mode, the first refrigeration system and the second refrigeration system are controlled to run simultaneously; the R600a refrigerant sequentially passes through the first compressor and the first condenser, and then enters the refrigeration evaporator and the variable-temperature evaporator through the electric valve for refrigeration; the R290 refrigerant sequentially passes through the second compressor and the second condenser, and then enters the second evaporator for refrigeration of the freezing chamber.

[0079] The embodiment of the present application uses a double-compressor double-refrigeration system for a three-system refrigerator, two refrigeration systems use different refrigerants, and whether the second refrigeration system is started can be selected according to different refrigeration requirements, so that the advantages of different refrigerants can be effectively utilized. Moreover, due to the cascade effect, the second refrigeration system can realize corresponding refrigeration requirements with a smaller compression ratio, effectively improves the refrigeration efficiency, and reduces the noise in the refrigeration process. When the refrigerator runs in the normal refrigeration mode, the freezing chamber is no longer refrigerated by the R290 refrigerant, but the R290 refrigeration system is turned off, and the R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the prior art solution using cascade refrigeration, and 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 refrigerator freezing chamber uses the R290 refrigerant for refrigeration, and the other compartments of the refrigerator still use the R600a refrigerant for refrigeration. At this time, the suction and discharge side compression ratio of the compressor is smaller than that of other products using a single refrigerant, the efficiency is higher, and because the compression ratio is smaller, the vibration generated by the compressor during operation is smaller, and the noise of the refrigerator during the whole refrigeration process is lower.

[0080] As one of the optional embodiments, the refrigeration pipeline comprises a first refrigeration pipeline, a second refrigeration pipeline and a third refrigeration pipeline;

[0081] The first refrigeration pipeline is connected with the first outlet of the electric valve, passes through a first capillary and the refrigeration evaporator, and then enters the suction port of the first compressor;

[0082] The second refrigeration pipeline is connected with the second outlet of the electric valve, passes through a second capillary and the variable-temperature evaporator, and then enters the suction port of the first compressor;

[0083] The third refrigeration pipeline is connected with the third outlet of the electric valve, passes through a third capillary and the freezing evaporator, and then is connected with the suction port of the first compressor.

[0084] Specifically, in the embodiment of the present application, the electric valve is used to divide the R600a refrigerant into three paths A, B and C, which are respectively connected with different refrigeration pipelines. The refrigeration pipelines include the first refrigeration pipeline A, the second refrigeration pipeline B and the third refrigeration pipeline C. The first refrigeration pipeline is connected with the first outlet of the electric valve, passes through a first capillary and the refrigerating evaporator, and then is connected with the suction port of the first compressor. The second refrigeration pipeline is connected with the second outlet of the electric valve, passes through a second capillary and the variable-temperature evaporator, and then is connected with the suction port of the first compressor. The third refrigeration pipeline is connected with the third outlet of the electric valve, passes through a third capillary and the freezing evaporator, and then is connected with the suction port of the first compressor.

[0085] As one of the optional embodiments, when the refrigerator is running in the normal refrigeration mode, the first outlet, the second outlet and the third outlet of the electric valve are all in the open state.

[0086] When the refrigerator is running in the deep refrigeration mode, the first outlet and the second outlet of the electric valve are in the open state, and the third outlet is in the closed state.

[0087] Specifically, in the embodiment of the present application, when the refrigerator operates in the normal refrigeration mode, the first outlet, the second outlet and the third outlet of the electric valve are all in the open state. The refrigerant enters the first condenser from the exhaust port of the first compressor for cooling. The R600a refrigerant from the outlet of the first condenser enters the inlet of the electric valve and is divided into three paths A, B and C, respectively, passes through the capillary, enters the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator, respectively, and is evaporated and absorbs heat in different evaporators to cool different compartments. Finally, they are combined together and returned to the suction port of the right side of the compressor. When the refrigerator operates in the deep refrigeration mode, the first outlet and the second outlet of the electric valve are in the open state, and the third outlet is in the closed state. The refrigerant enters the first condenser from the exhaust port of the first compressor for cooling. The R600a refrigerant from the outlet of the first condenser enters the inlet of the electric valve and is divided into two paths A and B, respectively, passes through the capillary, enters the refrigeration evaporator and the variable-temperature evaporator, respectively, and is evaporated and absorbs heat in different evaporators to cool different compartments. Finally, they are combined together and returned to the suction port of the right side of the compressor. At this time, the C path of the electric valve is in the closed state, and the second refrigeration system is started to refrigerate. The second refrigeration system uses R290 refrigerant, and the second condenser is located at the variable-temperature evaporator position. After being cooled by the variable-temperature evaporator, it can be cooled to a relatively low temperature. At this time, the R290 refrigerant is in a liquid state, passes through the left capillary, enters the second evaporator inside the freezing chamber, and is evaporated and absorbs heat. Because the evaporation temperature of the R290 refrigerant is low, the temperature of the freezing chamber can be lowered to a very low temperature. Such a cycle is repeated to perform a refrigeration cycle to refrigerate the refrigerator.

[0088] As one of the optional embodiments, the outlet of the refrigeration evaporator, the outlet of the variable-temperature evaporator and the outlet of the freezing evaporator are all connected with the suction port of the first compressor; the R600a refrigerant passes through the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator, is combined together and then enters the suction port of the first compressor again.

[0089] Specifically, in the embodiment of the present application, the outlet of the refrigeration evaporator, the outlet of the variable-temperature evaporator and the outlet of the freezing evaporator are all connected with the suction port of the first compressor, and the R600a refrigerant passes through the refrigeration evaporator, the variable-temperature evaporator and the freezing evaporator, is combined together and then enters the suction port of the first compressor again.

[0090] As one of the optional embodiments, the second condenser and the variable-temperature evaporator are oppositely arranged to enable heat exchange between the second condenser and the variable-temperature evaporator; the second evaporator and the freezing evaporator are oppositely arranged to enable heat exchange between the second evaporator and the freezing evaporator; and the R290 refrigerant is cooled by the variable-temperature evaporator when passing through the second condenser.

[0091] Specifically, the second condenser and the temperature swing evaporator are oppositely arranged in the embodiment of the present application, so that heat exchange is performed between the second condenser and the temperature swing evaporator. The R290 refrigerant is cooled by the temperature swing evaporator when passing through the second condenser, and can be cooled to a relatively low temperature, at which the R290 refrigerant is in a liquid state. The second evaporator and the freezing evaporator are oppositely arranged, so that heat exchange is performed between the second evaporator and the freezing evaporator.

[0092] The embodiment of the present application provides a refrigerator and a refrigeration control method thereof. For a three-system refrigerator, a double-compressor double-refrigeration system is used, two refrigeration systems use different refrigerants, whether to start the second refrigeration system can be selected according to different refrigeration requirements, and the advantages of different refrigerants can be effectively utilized. Moreover, due to the cascade effect, the second refrigeration system can use a smaller compression ratio to achieve the corresponding refrigeration requirement, effectively improve the refrigeration efficiency, and reduce the noise in the refrigeration process. When the refrigerator operates in a normal refrigeration mode, the freezing chamber is no longer refrigerated by using R290 refrigerant, but the R290 refrigeration system is turned off, and only R600a refrigerant is used for refrigeration. In the normal refrigeration mode, the single R600a refrigerant is different from the prior art scheme using cascade refrigeration, the single R600a refrigerant has higher refrigeration efficiency, is more energy-saving, and has smaller noise. When the refrigerator operates in a deep refrigeration mode, the freezing chamber needs to reach a lower refrigeration temperature, therefore, the refrigerator freezing chamber uses R290 refrigerant for refrigeration, and other compartments of the refrigerator still use R600a refrigerant for refrigeration. 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 refrigerator compressor during operation is smaller, and the noise of the refrigerator during the whole refrigeration process is lower.

[0093] 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 embodiments. In addition, the connection relationship between the modules in the system embodiments 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.

[0094] The above describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements are also considered within the protection scope of the present application.

Claims

1. A refrigerator, characterized in that, include: The cabinet, which serves as the supporting structure of the refrigerator, has several compartments inside; A refrigeration system, which is located inside the box, includes a first refrigeration system and a second refrigeration system; The first refrigeration system includes a first compressor, a first condenser, an electric valve, a refrigerated evaporator, a variable-temperature evaporator, and a frozen evaporator; the second refrigeration system includes a second compressor, a second condenser, and a second evaporator; wherein, the first refrigeration system uses R600a refrigerant, and the second refrigeration system uses R290 refrigerant; The discharge port of the first compressor is connected to the inlet of the first condenser, and the outlet of the first condenser is connected to the electric valve. The electric valve is used to divide the R600a refrigerant into three paths, which enter different refrigeration pipelines respectively. The discharge port of the second compressor is connected to the inlet of the second condenser, the outlet of the second condenser is connected to the inlet of the second evaporator, and the outlet of the second evaporator is connected to the suction port of the second compressor. The controller is configured to control the operation of the first refrigeration system when the refrigerator is running in normal refrigeration mode; the R600a refrigerant passes through the first compressor and the first condenser in sequence, and then enters the refrigerator evaporator, the variable temperature evaporator and the freezer evaporator through the electric valve for refrigeration; When the refrigerator is running in deep cooling mode, the first refrigeration system and the second refrigeration system are controlled to run simultaneously; the R600a refrigerant passes through the first compressor and the first condenser in sequence, and then enters the refrigerator evaporator and the variable temperature evaporator through the electric valve to cool; the R290 refrigerant passes through the second compressor and the second condenser in sequence, and then enters the second evaporator to cool the freezer compartment.

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

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

4. The refrigerator as described in claim 3, characterized in that, The outlets of the refrigerated evaporator, the variable-temperature evaporator, and the refrigerated evaporator are all connected to the suction port of the first compressor. After passing through the refrigerated evaporator, the variable-temperature evaporator, and the refrigerated evaporator, the R600a refrigerant is combined and then introduced into the suction port of the first compressor.

5. The refrigerator as described in claim 4, characterized in that, The second condenser and the variable-temperature evaporator are arranged opposite each other to exchange heat between them; the second evaporator and the refrigeration evaporator are arranged opposite each other to exchange heat between them; the R290 refrigerant is cooled by the variable-temperature evaporator when it passes through the second condenser.

6. A refrigerator cooling control method, characterized in that, The method is applied to a refrigerator including a cabinet and a refrigeration system; wherein the cabinet has several compartments, and the refrigeration system includes a first refrigeration system and a second refrigeration system; the first refrigeration system includes a first compressor, a first condenser, an electric valve, a refrigeration evaporator, a variable-temperature evaporator, and a freezing evaporator; the second refrigeration system includes a second compressor, a second condenser, and a second evaporator; wherein the first refrigeration system uses R600a refrigerant, and the second refrigeration system uses R290 refrigerant; the electric valve is used to divide the R600a refrigerant into three paths, which enter different refrigeration pipes respectively, and the refrigerator refrigeration control method includes: When the refrigerator is running in normal cooling mode, the first refrigeration system is controlled to operate; the R600a refrigerant passes through the first compressor and the first condenser in sequence, and then enters the refrigerator evaporator, the variable temperature evaporator and the freezer evaporator through the electric valve to perform refrigeration; When the refrigerator is running in deep cooling mode, the first refrigeration system and the second refrigeration system are controlled to run simultaneously; the R600a refrigerant passes through the first compressor and the first condenser in sequence, and then enters the refrigerator evaporator and the variable temperature evaporator through the electric valve to cool; the R290 refrigerant passes through the second compressor and the second condenser in sequence, and then enters the second evaporator to cool the freezer compartment.

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

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

9. The refrigerator cooling control method as described in claim 8, characterized in that, The outlets of the refrigerated evaporator, the variable-temperature evaporator, and the refrigerated evaporator are all connected to the suction port of the first compressor. After passing through the refrigerated evaporator, the variable-temperature evaporator, and the refrigerated evaporator, the R600a refrigerant is combined and then introduced into the suction port of the first compressor.

10. The refrigerator cooling control method as described in claim 9, characterized in that, The second condenser and the variable-temperature evaporator are arranged opposite each other to exchange heat between them; the second evaporator and the refrigeration evaporator are arranged opposite each other to exchange heat between them; the R290 refrigerant is cooled by the variable-temperature evaporator when it passes through the second condenser.

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