Refrigerator and control method thereof

Abstract

The invention discloses a refrigerator and a control method thereof, relates to the technical field of refrigerators, and aims to solve the problem of high energy consumption of a single-system refrigerator in the prior art. The refrigerator comprises a refrigerating system, a first temperature sensor, a second temperature sensor and a controller. The refrigerating system comprises a compressor, a first condenser, a throttling device, an evaporator and an air return pipe which are sequentially communicated through pipelines to form a circulation loop of refrigerants. The refrigerating system further comprises a condensate fan, and the condensate fan is used for blowing air to the first condenser. The first temperature sensor is arranged at an outlet of the air return pipe and used for detecting the outlet temperature of the air return pipe. The second temperature sensor is arranged outside the refrigerator and used for detecting the environment temperature outside the refrigerator; the controller is configured to obtain the current outlet temperature of the air return pipe and the current environment temperature outside the refrigerator and calculate the current temperature difference between the current outlet temperature and the current environment temperature. Adjusting the rotating speed of the condensate fan according to the current temperature difference. The refrigerator is used for storing food.

Description

Technical Field

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

[0002] Single-system refrigerators have only one refrigeration system, and use the same refrigeration system to cool both the freezer and refrigerator compartments. The new standards issued by Europe have set higher requirements for the energy efficiency and noise of refrigerators. As energy prices in Europe increase, consumers are also paying more attention to the energy consumption level of home appliances. Therefore, single-system refrigerators exported to Europe need to meet the requirements of high energy efficiency and low noise.

[0003] In the related art, a single-system refrigerator includes a bottom condenser and a back condenser connected in series, and a condensing fan is provided at the bottom condenser to cool the bottom condenser through the condensing fan. The speed of the condensing fan is adjusted according to the change of the ambient temperature outside the refrigerator to improve the cooling effect on the condenser, thereby adjusting the condensing effect of the bottom condenser so that the condensing effect of the bottom condenser can meet the refrigeration demand of the refrigerator.

[0004] However, the above adjustment method cannot take into account the amount of gaseous refrigerant and liquid refrigerant in the refrigerant condensed by the bottom condenser after the condensation efficiency of the bottom condenser changes. When there is a lot of gaseous refrigerant, the gaseous refrigerant cannot be fully condensed in the back condenser, resulting in a lot of gaseous refrigerant entering the evaporator, resulting in insufficient heat exchange of the refrigerant in the evaporator, and when the refrigerant flows through the return air pipe, the temperature of the return air pipe is low, which will increase the load of the compressor, and further increase the energy consumption of the single-system refrigerator. Summary of the invention

[0005] The embodiments of the present invention provide a refrigerator and a control method thereof, which solve the problem of high energy consumption of a single-system refrigerator in the related art.

[0006] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0007] According to the first aspect involved in the present application, a refrigerator is provided, comprising a refrigeration system, a first temperature sensor, a second temperature sensor and a controller, the refrigeration system comprising a compressor, a first condenser, a throttling device, an evaporator and a return air pipe which are connected in sequence through pipelines to form a circulation loop of the refrigerant; the refrigeration system also comprises a condensing fan, which is used to blow air to the first condenser; the first temperature sensor is arranged at the outlet of the return air pipe, and is used to detect the outlet temperature of the return air pipe; the second temperature sensor is arranged outside the refrigerator, and is used to detect the ambient temperature outside the refrigerator; the controller is connected to the condensing fan, the first temperature sensor and the second temperature sensor, and is configured to: obtain the current outlet temperature of the return air pipe and the current ambient temperature outside the refrigerator, and calculate the current temperature difference between the current outlet temperature and the current ambient temperature; and adjust the speed of the condensing fan according to the current temperature difference.

[0008] The refrigerator provided by the present application can refrigerate the refrigerator by flowing the refrigerant in the circulation loop formed by the compressor, the first condenser, the throttling device, the return air pipe and the evaporator. During the refrigeration process of the refrigerator, the current temperature difference between the current outlet temperature of the return air pipe and the current ambient temperature outside the refrigerator can reflect the condensation effect of the first condenser at the current moment and the content of the gaseous refrigerant at the outlet of the first condenser, so as to adjust the speed of the condensing fan according to the current temperature difference between the current outlet temperature of the return air pipe and the current ambient temperature outside the refrigerator, which can avoid to a certain extent the excessive content of the gaseous refrigerant in the refrigerant at the outlet of the first condenser due to the change of the speed of the condensing fan, and further reduce the influence of the change of the speed of the condensing fan on the temperature of the return air pipe, so as to avoid the high energy consumption of the refrigerator caused by the return air pipe temperature being too low.

[0009] In some embodiments, the controller executes adjustment of the speed of the condensing fan according to the current temperature difference, and is configured to: determine the target temperature difference interval in which the current temperature difference is located, the target temperature difference interval being one of multiple preset temperature difference intervals between the outlet temperature and the ambient temperature; determine the target speed that the condensing fan needs to be adjusted according to the correspondence between the multiple preset temperature difference intervals and the multiple preset speeds that the condensing fan needs to be adjusted, the target speed being one of the multiple preset speeds; adjust the speed of the condensing fan according to the target speed; in this way, the target speed that the condensing fan needs to be adjusted can be quickly obtained, so as to quickly adjust the speed of the condensing fan, thereby timely adjusting the temperature of the return air duct.

[0010] In some embodiments, the controller executes to adjust the speed of the condensing fan according to the current temperature difference, and is specifically configured as follows: determine whether the current temperature difference is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, and the first preset temperature is less than the second preset temperature; if the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the speed of the condensing fan is not adjusted; if the current temperature difference is less than the first preset temperature, the speed of the condensing fan is increased by a target speed; if the current temperature difference is greater than the second preset temperature, the speed of the condensing fan is reduced by a target speed; by increasing or decreasing the speed of the condensing fan according to the current temperature difference and the first preset temperature and the second preset temperature, the speed of the first condensing fan can be quickly adjusted, thereby quickly adjusting the temperature of the return air duct.

[0011] In some embodiments, the refrigerator also includes a flow regulating component, which is connected in series to the circulation loop and connected to the inlet of the throttling device, for regulating the flow of refrigerant entering the throttling device; after the controller executes the adjustment of the speed of the condensing fan according to the target speed, it is configured as follows: determining the target speed that the condensing fan needs to be adjusted once every first preset time period, and adjusting the speed of the condensing fan once according to the target speed; until the speed of the condensing fan increases to the maximum speed or decreases to the minimum speed, the flow regulating component is controlled to adjust the flow of the refrigerant entering the throttling device; by increasing the flow of the refrigerant entering the throttling device, the heat exchange effect of the refrigerant in the evaporator can be improved, thereby increasing the temperature of the return air pipe, so that the temperature of the return air pipe quickly rises to an acceptable range.

[0012] In some embodiments, the controller executes a control flow regulating component to regulate the flow of the refrigerant entering the throttling device, and is configured as follows: determining whether the outlet temperature of the return air pipe reaches the set temperature once every second preset time period; if the outlet temperature reaches the set temperature, the flow of the refrigerant entering the throttling device is not regulated; if the outlet temperature does not reach the set temperature, when the current temperature difference is less than the first preset temperature, the flow of the refrigerant entering the throttling device is increased once, and when the current temperature difference is greater than the first preset temperature, the flow of the refrigerant entering the throttling device is reduced once; through the above-mentioned setting, the temperature of the return air pipe can be quickly adjusted, thereby avoiding increasing the load of the compressor for a long time, and then quickly reducing the energy consumption of the compressor, so as to reduce the energy consumption of the refrigerator.

[0013] In some embodiments, the throttling device includes multiple capillaries, and the outlets of the multiple capillaries are connected to the inlet of the evaporator; the flow regulating component includes an electric switching valve, which is connected to the inlets of the multiple capillaries and is used to block or open at least one capillary; the flow rates of the capillaries are different, and the electric switching valve adjusts the flow rate of the refrigerant entering the throttling device by opening different capillaries or opening different numbers of capillaries; or, the flow rates of the capillaries are the same, and the electric switching valve adjusts the flow rate of the refrigerant entering the throttling device by opening different numbers of capillaries; the method of adjusting the flow rate of the refrigerant entering the throttling device by the number of capillaries or the different flow rates of different capillaries is relatively simple and easy to implement.

[0014] In some embodiments, before the controller executes the adjustment of the speed of the condensing fan according to the current temperature difference, it is also configured to: determine the target temperature range in which the current ambient temperature is located, the target temperature range being one of multiple preset temperature ranges outside the refrigerator; determine the target initial speed and target initial flow corresponding to the target temperature range according to a preset mapping relationship; the target initial speed is one of multiple preset initial speeds of the condensing fan, and the target initial flow is one of multiple preset initial flow rates of the refrigerant entering the throttling device, and the mapping relationship is used to indicate that a preset temperature range corresponds to a preset initial speed and a preset initial flow rate; control the condensing fan to operate at the target initial speed, and adjust the flow rate of the refrigerant entering the throttling device to the target initial flow rate; through the above settings, the condensing effect of the first condenser can be preliminarily guaranteed under different ambient temperatures to avoid large deviations in the condensing effect of the first condenser resulting in large changes in the outlet temperature of the return air pipe.

[0015] According to the second aspect of the present application, a refrigerator control method is provided, including: obtaining the current outlet temperature of the return air duct and the current ambient temperature outside the refrigerator, and calculating the current temperature difference between the current outlet temperature and the current ambient temperature; adjusting the speed of the condensing fan according to the current temperature difference.

[0016] In some embodiments, adjusting the speed of the condensing fan according to the current temperature difference includes: determining the target temperature difference interval in which the current temperature difference is located, the target temperature difference interval being one of multiple preset temperature difference intervals between the outlet temperature and the ambient temperature; determining the target speed that the condensing fan needs to be adjusted according to the correspondence between the multiple preset temperature difference intervals and the multiple preset speeds that the condensing fan needs to be adjusted, the target speed being one of the multiple preset speeds; and adjusting the speed of the condensing fan according to the target speed.

[0017] In some embodiments, adjusting the speed of the condensing fan according to the target speed includes: determining whether the current temperature difference is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the first preset temperature being less than the second preset temperature; if the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the speed of the condensing fan is not adjusted; if the current temperature difference is less than the first preset temperature, the speed of the condensing fan is increased by the target speed; if the current temperature difference is greater than the second preset temperature, the speed of the condensing fan is reduced by the target speed.

[0018] It should be noted that the technical effects brought about by the implementation method of the second aspect can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is one of the structural schematic diagrams of the refrigerator in the embodiment of the present application;

[0020] Figure 2 This is a partial structural schematic diagram of a refrigerator in an embodiment of the present application;

[0021] Figure 3 This is a schematic cross-sectional structural diagram of a refrigerator in an embodiment of the present application;

[0022] Figure 4 This is the second structural diagram of the refrigerator in the embodiment of the present application;

[0023] Figure 5 This is the third structural diagram of the refrigerator in the embodiment of the present application;

[0024] Figure 6 This is a schematic diagram of the connection relationship of the refrigeration system in the embodiment of the present application;

[0025] Figure 7 for Figure 3 A schematic diagram of the structure enlargement in the middle;

[0026] Figure 8 This is one of the schematic diagrams of the connection relationship between the controller and other components in the embodiment of the present application;

[0027] Fig. 9 This is the second schematic diagram of the connection relationship between the controller and other components in the embodiment of the present application;

[0028] Fig.10 This is one of the flow charts of the refrigerator control method in the embodiment of the present application;

[0029] Fig.11 This is the second flow chart of the refrigerator control method in the embodiment of the present application;

[0030] Fig.12This is the third flow chart of the refrigerator control method in the embodiment of the present application;

[0031] Fig.13 This is a fourth flow chart of the refrigerator control method in the embodiment of the present application;

[0032] Fig.14 This is the fifth flow chart of the refrigerator control method in the embodiment of the present application;

[0033] Fig.15 This is the sixth flow chart of the refrigerator control method in the embodiment of the present application;

[0034] Fig.16 This is the seventh flow chart of the refrigerator control method in the embodiment of the present application;

[0035] Fig.17 This is the eighth flow chart of the refrigerator control method in the embodiment of the present application.

[0036] Reference numerals:

[0037] 1-box; 11-storage room; 111-refrigerating room; 112-freezing room; 12-freezing air duct; 13-refrigerating air duct; 14-return air duct; 15-installation cavity;

[0038] 2- portal;

[0039] 3-refrigeration system; 31-compressor; 32-first condenser; 33-throttling device; 331-capillary tube; 34-return air pipe; 35-evaporator; 36-circulation fan; 37-second condenser; 38-condensing fan;

[0040] 4- first temperature sensor;

[0041] 5- Second temperature sensor;

[0042] 6- Controller;

[0043] 7-flow regulating assembly; 71-electric switching valve. DETAILED DESCRIPTION

[0044] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0045] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, when describing pipelines or channels, the "connected" and "connected" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0048] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0049] As a common household appliance, refrigerators are widely used in daily life. Refrigerators include single-system refrigerators and double-system refrigerators. Among them, single-system refrigerators are widely used because of their simple use and low price.

[0050] In the related art, the change in the rotation speed of the condensing fan of the single-system refrigerator causes insufficient condensation of the refrigerant by the bottom condenser, resulting in a lower temperature of the return air pipe, which in turn leads to higher energy consumption of the single-system refrigerator.

[0051] Based on this, the embodiment of the present application provides a refrigerator, such as Figure 1 As shown, the refrigerator includes a box body 1 and a door body 2. A storage chamber 11 with an opening on one side is formed in the box body 1, and the storage chamber 11 is defined as a refrigerating chamber 111 and a freezing chamber 112 isolated from each other. The door body 2 is arranged at the opening for opening or closing the opening.

[0052] The refrigerating chamber 111 and the freezing chamber 112 are both used to store food, and the temperature of the refrigerating chamber 111 is higher than the temperature of the freezing chamber 112. Figure 2As shown, the refrigerator further includes a refrigeration system 3. The refrigeration system 3 is arranged in the housing 1, and is used to adjust the temperature of the refrigerating chamber 111 and the temperature of the freezing chamber 112, so as to improve the storage effect of the freezing chamber 112 and the refrigerating chamber 111 on food.

[0053] like Figure 3 As shown, a freezing air duct 12 and a refrigerating air duct 13 are also formed in the box body 1. Figure 4 As shown, the air inlet of the freezing air duct 12 and the air outlet of the freezing air duct 12 are both connected to the freezing chamber 112. Figure 5 As shown, the freezing air duct 12 is connected to the freezing chamber 112 to form a freezing circulation air path of the freezing chamber 112 (such as Figure 5 The temperature of the freezing chamber 112 can be adjusted by cooling the air in the freezing cycle through the refrigeration system 3.

[0054] like Figure 4 As shown, the air inlet of the refrigerating air duct 13 is connected to the air outlet of the freezing air duct 12, the air outlet of the refrigerating air duct 13 is connected to the refrigerating chamber 111, and the refrigerating chamber 111 is connected to the return air outlet of the freezing air duct 12. Specifically, a return air duct 14 is also formed in the cabinet 1, the inlet of the return air duct 14 is connected to the refrigerating chamber 111, and the outlet of the return air duct 14 is connected to the return air outlet of the freezing air duct 12, so that the refrigerating chamber 111 is connected to the return air outlet of the freezing air duct 12 through the return air duct 14.

[0055] like Figure 5 As shown, the refrigeration air duct 12, the refrigeration air duct 13, the refrigeration chamber 111 and the return air duct 14 are connected in sequence to form a refrigeration circulation air path of the refrigeration chamber 111 (as shown in FIG. Figure 5 The temperature of the refrigerating chamber 111 can be adjusted by cooling the air in the refrigerating circulating air path 111 through the refrigerating system 3.

[0056] Specifically, Figure 6 As shown, the refrigeration system 3 includes a compressor 31, a first condenser 32, a throttling device 33, an evaporator 34 and a return pipe 35 which are connected in sequence through pipelines to form a circulation loop of the refrigerant. Figure 7 As shown, the evaporator 34 is disposed in the freezing air duct 12. The refrigerator further includes a circulation fan 36, which is also disposed in the freezing air duct 12.

[0057] When the refrigeration system 3 is in operation, the refrigerant in the refrigeration system 3 is compressed into a high-temperature and high-pressure refrigerant by the compressor 31. The high-temperature and high-pressure refrigerant flows out of the compressor 31 and enters the first condenser 32, and is condensed into a high-temperature and high-pressure liquid refrigerant by the first condenser 32. The high-temperature and high-pressure liquid refrigerant enters the throttling device 33, and is throttled and reduced in pressure by the throttling device 33 to be a low-temperature and low-pressure liquid refrigerant. The low-temperature and low-pressure liquid refrigerant flows out of the throttling device 33 and enters the evaporator 34, and is evaporated into a low-temperature and low-pressure gaseous refrigerant by the evaporator 34. After the low-temperature and low-pressure gaseous refrigerant flows out of the evaporator 34, it passes through the return air pipe 35 and enters the compressor 31 to be compressed again.

[0058] In which, during the evaporation process of the refrigerant in the evaporator 34, the refrigerant will exchange heat with the air in the freezing air duct 12, thereby reducing the air temperature in the freezing air duct 12. Under the action of the circulating fan 36, the air with reduced temperature can reduce the temperature of the freezing chamber 112 in the process of flowing through the freezing chamber 112 through the freezing circulating air path, and can reduce the temperature of the refrigerating chamber 111 in the process of flowing through the refrigerating chamber 111 through the refrigerating circulating air path.

[0059] The operation of the refrigeration system 3 refers to the operation of the compressor 31, and the operation of the compressor 31 can cause the refrigerant to circulate in the refrigerant circulation loop. The speed of the compressor 31 when it is started can be set according to the start-up rate of the refrigerator. Specifically, according to the corresponding relationship between the start-up rate of the compressor 31 and the preset start-up speed of the compressor 31, the compressor 31 can be controlled to operate at the preset start-up speed.

[0060] The corresponding relationship between the startup rate of the compressor 31 and the preset startup speed of the compressor 31 can be: when the startup rate is greater than 90%, the preset startup speed is 4200r / min, when the startup rate is 80-90%, the preset startup speed is 3900r / min, when the startup rate is 60-80%, the preset startup speed is 3000r / min, when the startup rate is 50-60%, the preset startup speed is 2400r / min, when the startup rate is 30-50%, the preset startup speed is 2000r / min. When the startup rate is less than 30%, the preset startup speed is 1200r / min.

[0061] In addition, if Figure 2 As shown, the lower end of the housing 1 is also formed with an installation cavity 15. The compressor 31 and the first condenser 32 can be arranged in the installation cavity 15. Figure 6As shown, the refrigeration system 3 may further include a second condenser 37. The second condenser 37 is disposed in the interlayer at the back of the box body 1 and is connected in series between the first condenser 32 and the throttling device 33. In this way, after the refrigerant flows through the first condenser 32 for condensation, it will enter the second condenser 37 and be condensed again in the second condenser 37, thereby improving the condensation effect of the refrigerant.

[0062] It should be noted that the throttling device 33 can be a capillary tube, a thermal expansion valve, an electric expansion valve, etc.

[0063] Since the refrigerant releases heat during the condensation process in the first condenser 32 , the temperature of the condenser will increase, which will affect the condensation effect and temperature of the refrigerant, and further affect the refrigeration effect of the refrigeration system 3 .

[0064] Therefore, in order to improve the refrigeration effect of the refrigeration system 3, as Figure 2 As shown, the refrigeration system further includes a condensing fan 38. The condensing fan 38 is disposed in the installation cavity 15 and is located on one side of the first condenser 32. The condensing fan 38 is used to blow air toward the first condenser 32 to cool and dissipate heat of the first condenser 32, thereby improving the condensation effect of the first condenser 32 on the refrigerant.

[0065] During the operation of the refrigeration system 3, the speed of the condensing fan 38 usually changes with the change of the ambient temperature outside the refrigerator. In order to reduce the situation where the temperature of the return air pipe 35 is low due to the change of the speed of the condensing fan 38, as shown in FIG. Figure 8 As shown, the refrigerator further includes a first temperature sensor 4 , a second temperature sensor 5 and a controller 6 .

[0066] The first temperature sensor 4 is disposed at the outlet of the return air duct 35 to detect the outlet temperature of the return air duct 35 ; the second temperature sensor 5 is disposed outside the refrigerator to detect the ambient temperature outside the refrigerator.

[0067] The controller 6 is connected to the condensing fan 38, the first temperature sensor 4 and the second temperature sensor 5. The controller 6 can receive the outlet temperature of the return air duct 35 detected by the first temperature sensor 4 and the ambient temperature outside the refrigerator detected by the second temperature sensor 5, and the controller 6 can also control the rotation speed of the condensing fan 38.

[0068] The controller 6 is configured to: obtain the current outlet temperature of the return air duct 35 and the current ambient temperature outside the refrigerator, and calculate the current temperature difference between the current outlet temperature and the current ambient temperature; and adjust the rotation speed of the condensing fan 38 according to the current temperature difference.

[0069] Since the condensation effect of the first condenser 32 is poor, there will be more gaseous refrigerant in the refrigerant flowing out of the first condenser 32, which will result in more gaseous refrigerant entering the evaporator 34, which will result in insufficient heat exchange of the refrigerant in the evaporator 34, resulting in a lower temperature of the return air pipe 35. In addition, changes in the ambient temperature outside the refrigerator will affect the heat dissipation effect of the first condenser 32, thereby affecting the condensation effect of the first condenser 32.

[0070] Therefore, the current temperature difference between the current outlet temperature of the return air pipe 35 and the current ambient temperature outside the refrigerator can reflect the condensation effect of the first condenser 32 and the content of the gaseous refrigerant at the outlet of the first condenser 32 at the current moment.

[0071] In this way, by adjusting the rotation speed of the condensing fan 38 according to the current temperature difference between the current outlet temperature of the return air duct 35 and the current ambient temperature outside the refrigerator, it is possible to avoid, to a certain extent, the excessive content of gaseous refrigerant in the refrigerant at the outlet of the first condenser 32 due to the change in the rotation speed of the condensing fan 38, thereby reducing the impact of the change in the rotation speed of the condensing fan 38 on the temperature of the return air duct 35, thereby avoiding the return air duct 35 temperature being too low and resulting in high energy consumption of the refrigerator.

[0072] It should be noted that the speed of the condensing fan 38 is adjusted based on the initial speed of the condensing fan 38 by the current temperature difference. That is, after the refrigeration system 3 is running, the condensing fan 38 has a certain initial speed, which can be 0 or greater than 0. Then, the speed of the condensing fan 38 is increased or decreased based on the initial speed of the condensing fan 38.

[0073] Among them, adjusting the speed of the condensing fan 38 according to the current temperature difference can be achieved by making the current temperature difference and the speed of the condensing fan 38 have a linear relationship (i.e., a functional relationship). At this time, after obtaining the current temperature difference, the speed to which the condensing fan 38 should be adjusted can be obtained according to the functional relationship, so as to control the condensing fan 38 to run at the speed.

[0074] Adjusting the speed of the condensing fan 38 according to the current temperature difference can also be achieved in other ways. Exemplarily, the controller 6 performs the adjustment of the speed of the condensing fan 38 according to the current temperature difference, and is configured to: determine the target temperature difference interval where the current temperature difference is located, and the target temperature difference interval is one of multiple preset temperature difference intervals between the outlet temperature and the ambient temperature; determine the target speed of the condensing fan 38 that needs to be adjusted according to the correspondence between the multiple preset temperature difference intervals and the multiple preset speeds that need to be adjusted of the condensing fan 38, and the target speed is one of the multiple preset speeds; and adjust the speed of the condensing fan 38 according to the target speed.

[0075] That is to say, the temperature difference range (-∞~+∞) between the outlet temperature of the return air duct 35 and the ambient temperature outside the refrigerator is divided into multiple intervals in advance, thereby forming multiple preset temperature difference intervals, and a preset speed that the condensing fan 38 needs to be adjusted is set in advance for each temperature difference interval.

[0076] In this way, after obtaining the current temperature difference between the current outlet temperature of the return air duct 35 and the current ambient temperature outside the refrigerator, the target speed that the condensing fan 38 needs to be adjusted can be quickly obtained, and then the target speed can be increased based on the initial speed of the condensing fan 38, or the target speed can be reduced, or the speed of the condensing fan 38 can be not adjusted, so as to quickly adjust the speed of the condensing fan 38, thereby timely adjusting the temperature of the return air duct 35.

[0077] Specifically, the controller 6 executes to adjust the speed of the condensing fan 38 according to the current temperature difference, and is specifically configured as follows: determine whether the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, and the first preset temperature is less than the second preset temperature; if the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the speed of the condensing fan 38 is not adjusted; if the current temperature difference is less than the first preset temperature, the speed of the condensing fan 38 is increased by the target speed; if the current temperature difference is greater than the second preset temperature, the speed of the condensing fan 38 is reduced by the target speed.

[0078] The first preset temperature may be -2°C, and the second preset temperature may be 0°C; the first preset temperature may also be -1°C, and the second preset temperature may also be 1°C.

[0079] When the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, it means that the temperature of the return air pipe 35 is within a relatively suitable range. At this time, the condensation effect of the first condenser 32 can meet the needs of the refrigerator, so there is no need to adjust the speed of the condensing fan 38.

[0080] When the current temperature difference is less than the first preset temperature, it means that the temperature of the return air pipe 35 is low. At this time, the condensation effect of the first condenser 32 is poor, and there is more gaseous refrigerant in the refrigerant at the outlet of the first condenser 32. Therefore, it is necessary to increase the speed of the condensing fan 38 to improve the condensation effect of the first condenser 32.

[0081] At this time, the range in which the temperature difference between the outlet temperature of the return air duct 35 and the ambient temperature outside the refrigerator is less than the first preset temperature can be divided into multiple first preset temperature difference intervals, and a first preset speed that the condensing fan 38 needs to be adjusted is set for each first preset temperature difference interval.

[0082] It should be noted that the multiple preset temperature difference intervals include multiple first preset temperature difference intervals, and the multiple preset rotational speeds include multiple first preset rotational speeds. The first preset rotational speeds corresponding to different first preset temperature difference intervals may be the same or different.

[0083] When the current temperature difference is greater than the first preset temperature, it means that the temperature of the return air pipe 35 is relatively high. At this time, the condensation effect of the first condenser 32 exceeds the demand of the refrigerator. There is more liquid refrigerant in the refrigerant at the outlet of the first condenser 32. The temperature of the liquid refrigerant is relatively high after evaporation and heat exchange in the evaporator 34, which causes the temperature of the return air pipe 35 to be too high. Therefore, it is necessary to reduce the rotation speed of the condensing fan 38 to reduce the energy consumption of the refrigerator.

[0084] At this time, the range in which the temperature difference between the outlet temperature of the return air duct 35 and the ambient temperature outside the refrigerator is greater than the second preset temperature can be divided into multiple second preset temperature difference intervals, and a second preset speed that the condensing fan 38 needs to adjust is set for each second preset temperature difference interval.

[0085] It should be noted that the plurality of preset temperature difference intervals include a plurality of second preset temperature difference intervals, and the plurality of preset rotational speeds include a plurality of second preset rotational speeds. The second preset rotational speeds corresponding to different second preset temperature difference intervals may be the same or different.

[0086] Table 1

[0087] Preset temperature difference range A Preset speed A＞8℃ Reduce 450r / min 4℃＜A≤8℃ Reduce 300r / min 0℃＜A≤4℃ Reduce 150r / min -2℃≤A≤0℃ No adjustment -5℃≤A＜-2℃ Increase 150r / min -10℃≤A＜-5℃ Increase 300r / min A＜-10℃ Increase 450r / min

[0088] For example, as shown in Table 1, the first preset temperature is -2°C, and the second preset temperature is 0°C. At this time, when the current temperature difference is greater than or equal to -2°C and less than or equal to 0°C, the speed of the condensing fan 38 is not adjusted. The multiple preset temperature difference intervals are: A>8°C, 4°C<A≤8°C, 0°C<A≤4°C, -2°C≤A≤0°C, -5°C≤A<-2°C, -10°C≤A<-5°C, A<-10°C.

[0089] Among them, when the current temperature difference is less than -2°C, multiple first preset temperature difference intervals are: -5°C≤A<-2°C, -10°C≤A<-5°C, A<-10°C. At this time, when the first preset temperature difference interval is -5°C≤A<-2°C, the corresponding preset speed is increased by 150r / min; when the first preset temperature difference interval is -10°C≤A<-5°C, the corresponding preset speed is increased by 300r / min; when the first preset temperature difference interval is A<-10°C, the corresponding preset speed is increased by 450r / min.

[0090] When the current temperature difference is greater than 0℃, the multiple second preset temperature difference intervals are: A>8℃, 4℃<A≤8℃, 0℃<A≤4℃. At this time, when the second preset temperature difference interval is A>8℃, the corresponding preset speed is reduced by 450r / min; when the second preset temperature difference interval is 4℃<A≤8℃, the corresponding preset speed is reduced by 300r / min; when the second preset temperature difference interval is 0℃<A≤4℃, the corresponding preset speed is reduced by 150r / min.

[0091] By adjusting the rotation speed of the condensing fan 38 in the above manner, it is possible to timely adjust the outlet temperature of the return air duct 35 while avoiding the rotation speed of the condensing fan 38 being too high or too low, thereby reducing the energy consumption of the condensing fan 38 and reducing the energy consumption of the refrigerator.

[0092] In some embodiments, since the speed of the condensing fan 38 can only be adjusted between 0 r / min and the maximum speed, when the speed of the condensing fan 38 is increased to the maximum speed or decreased to 0 r / min, if the outlet temperature of the return air pipe 35 still does not meet the requirements, it can be adjusted by adjusting the flow rate of the refrigerant entering the throttling device 33.

[0093] Specifically, Figure 6 As shown, the refrigerator further includes a flow regulating assembly 7. The flow regulating assembly 7 is connected in series to the circulation loop and is connected to the inlet of the throttling device 33 to regulate the flow of the refrigerant entering the throttling device 33.

[0094] like Fig. 9 As shown, the controller 6 is connected to the flow regulating component 7. The controller 6 can control the flow regulating component 7 to operate, thereby regulating the flow of the refrigerant entering the throttling device 33.

[0095] After the controller 6 executes the operation of adjusting the speed of the condensing fan 38 according to the target speed, it is configured as follows: determining the target speed to which the condensing fan 38 needs to be adjusted once every first preset time period, and adjusting the speed of the condensing fan 38 according to the target speed; until the speed of the condensing fan 38 increases to the maximum speed or decreases to the minimum speed, the flow regulating component 7 is controlled to adjust the flow of the refrigerant entering the throttling device 33.

[0096] That is, the current temperature difference between the current outlet temperature of the return air duct 35 and the current ambient temperature outside the refrigerator is calculated once every first preset time interval, and the target speed of the condensing fan 38 that needs to be adjusted is determined based on the current temperature difference.

[0097] Then, when the current temperature difference is less than the first preset temperature, the speed of the condensing fan 38 is increased by the target speed once until the speed of the condensing fan 38 increases to the maximum speed of the condensing fan 38. At this time, if the outlet temperature of the return air pipe 35 is still unqualified, the flow rate of the refrigerant entering the throttling device 33 begins to increase.

[0098] By increasing the flow rate of the refrigerant entering the throttling device 33, the amount of refrigerant entering the evaporator 34 can be increased, thereby improving the heat exchange effect of the refrigerant in the evaporator 34, and then increasing the temperature of the return air pipe 35, so that the temperature of the return air pipe 35 can be quickly raised to an acceptable range.

[0099] When the current temperature is greater than the second preset temperature, the speed of the condensing fan 38 is reduced by the target speed once until the speed of the condensing fan 38 is reduced to the minimum speed of the condensing fan 38 (i.e., 0r / min). At this time, if the outlet temperature of the return air pipe 35 is still unqualified, the flow rate of the refrigerant entering the throttling device 33 begins to be reduced.

[0100] By reducing the flow rate of the refrigerant entering the throttling device 33, the amount of refrigerant entering the evaporator 34 can be reduced, thereby reducing the heat exchange effect of the refrigerant in the evaporator 34, and then reducing the temperature of the return air pipe 35, so that the temperature of the return air pipe 35 can be quickly reduced to an acceptable range.

[0101] The flow regulating component 7 may be a flow regulating valve, such as a butterfly valve, a ball valve, etc.

[0102] The flow regulating assembly 7 may also include an electric switching valve 71. Figure 6 As shown, the throttling device 33 includes a plurality of capillaries 331 . The outlets of the plurality of capillaries 331 are connected to the inlet of the evaporator 34 ; the electric switching valve 71 is connected to the inlet of the plurality of capillaries 331 to block or conduct at least one capillary 331 .

[0103] Exemplarily, the electric switching valve 71 has an inlet and multiple outlets, the inlet of the electric switching valve 71 is connected to the outlet of the second condenser 37, the multiple outlets of the electric switching valve 71 correspond one-to-one to the multiple capillaries 331, and one outlet of the electric switching valve 71 is connected to the inlet of a capillary tube 331. The flow rate of the refrigerant entering the throttling device 33 is regulated by opening or blocking different capillaries 331 through the electric switching valve 71.

[0104] Specifically, the flow rates of the capillaries 331 may be different or the same. When the flow rates of the capillaries 331 are different, the electric switching valve 71 adjusts the flow rate of the refrigerant entering the throttling device 33 by connecting different capillaries 331 or connecting different numbers of capillaries 331; when the flow rates of the capillaries 331 are the same, the electric switching valve 71 adjusts the flow rate of the refrigerant entering the throttling device 33 by connecting different numbers of capillaries 331.

[0105] It should be noted that the first preset time can be 5 minutes, 6 minutes, 7 minutes, etc. The flow rate of the refrigerant entering the throttling device 33 is adjusted by the control flow regulating component 7 on the basis of the initial flow rate of the refrigerant entering the throttling device 33, that is, when the refrigeration system 3 is started, the refrigerant entering the throttling device 33 has an initial flow rate.

[0106] In some embodiments, the initial rotation speed of the condensing fan 38 and the initial flow rate of the refrigerant entering the throttling device 33 can be set according to the ambient temperature outside the refrigerator.

[0107] Specifically, before the controller 6 executes the adjustment of the speed of the condensing fan 38 according to the current temperature difference, it is also configured to: determine the target temperature range in which the current ambient temperature is located, the target temperature range being one of multiple preset temperature ranges outside the refrigerator; determine the target initial speed and target initial flow corresponding to the target temperature range according to a preset mapping relationship; the target initial speed is one of multiple preset initial speeds of the condensing fan 38, and the target initial flow is one of multiple preset initial flow rates of the refrigerant entering the throttling device 33, and the mapping relationship is used to indicate that a preset temperature range corresponds to a preset initial speed and a preset initial flow; control the condensing fan 38 to operate at the target initial speed, and adjust the flow rate of the refrigerant entering the throttling device 33 to the target initial flow.

[0108] That is, the range of the ambient temperature outside the refrigerator is divided into a plurality of intervals in advance to form a plurality of preset temperature intervals, and a preset initial rotation speed and a preset initial flow rate are correspondingly set for each preset temperature interval.

[0109] Among them, the preset initial rotation speeds corresponding to different preset temperature intervals may be the same or different; the preset initial flow rates corresponding to different preset temperature intervals may be the same or different.

[0110] Table 2

[0111]

[0112] Exemplarily, as shown in Table 2, the number of the capillaries 331 is two, the two capillaries 331 are respectively a first capillary 331 and a second capillary 331, and the flow rate of the first capillary 331 is greater than the flow rate of the second capillary 331. The plurality of preset temperature intervals B may be: B>40°C, 36°C<B≤40°C, 28°C<B≤36°C, B≤28°C.

[0113] When the preset temperature range is B>40℃, the corresponding preset initial speed is 1150r / min, and the corresponding preset initial flow rate is that the first capillary 331 is turned on; when the preset temperature range is 36℃<B≤40℃, the corresponding preset initial speed is 1000r / min, and the corresponding preset initial flow rate is that the first capillary 331 is turned on; when the preset temperature range is 28℃<B≤36℃, the corresponding preset initial speed is 800r / min, and the corresponding preset initial flow rate is that the first capillary 331 is turned on; when the preset temperature range is B≤28℃, the corresponding preset initial speed is 0r / min, and the corresponding preset initial flow rate is that the second capillary 331 is turned on.

[0114] By setting the preset initial speed of the condensing fan 38 and the preset initial flow rate of the refrigerant entering the throttling device 33 in advance according to different preset temperature ranges of the ambient temperature outside the refrigerator, the initial speed of the condensing fan 38 and the initial flow rate of the refrigerant entering the throttling device 33 can be matched with the ambient temperature, so that the condensation effect of the first condenser 32 can be preliminarily guaranteed at different ambient temperatures, so as to avoid a large deviation in the condensation effect of the first condenser 32 and cause a large change in the outlet temperature of the return air pipe 35.

[0115] In this way, when adjusting the speed of the condensing fan 38 and the flow rate of the refrigerant entering the throttling device 33 to adjust the outlet temperature of the return air duct, they can be more efficient, thereby reducing the energy consumption of the refrigerator.

[0116] In some embodiments, the controller 6 executes control of the flow regulating component 7 to regulate the flow of the refrigerant entering the throttling device 33, and is configured as follows: once every second preset time period, it is determined whether the outlet temperature of the return air pipe 35 reaches the set temperature; if the outlet temperature reaches the set temperature, the flow of the refrigerant entering the throttling device 33 is not adjusted; if the outlet temperature does not reach the set temperature, when the current temperature difference is less than the first preset temperature, the flow of the refrigerant entering the throttling device 33 is increased once, and when the current temperature difference is greater than the first preset temperature, the flow of the refrigerant entering the throttling device 33 is reduced once.

[0117] By detecting the outlet temperature of the return air pipe 35 once at every second preset time interval and judging whether the outlet temperature reaches the set temperature, for each judgment, if the outlet temperature does not reach the set temperature, the flow rate of the refrigerant entering the throttling device 33 is adjusted once, the temperature of the return air pipe 35 can be quickly adjusted, thereby avoiding increasing the load of the compressor 31 for a long time, and then quickly reducing the energy consumption of the compressor 31, so as to reduce the energy consumption of the refrigerator.

[0118] The second preset time length may be 5 minutes, 6 minutes, 7 minutes, etc. The set temperature may be a range, such as -2°C to 0°C, -1°C to 1°C, etc. The set temperature may also be a value, such as -2°C, -1°C, 0°C, etc. The amplitude of each adjustment of the flow rate of the refrigerant entering the throttling device 33 may be the same or different.

[0119] The flow rate of the refrigerant entering the throttling device 33 can be adjusted by increasing or decreasing the number of the capillary tubes 331 that are connected, or by switching the capillary tubes 331 with different flow rates.

[0120] Exemplarily, the correspondence between a plurality of preset temperature difference intervals and a plurality of preset rotational speeds is shown in Table 1, and the setting of the capillary tube 331 and the setting of the initial flow rate of the refrigerant entering the throttling device 33 are shown in Table 2.

[0121] When the preset temperature difference range is A>8℃, 4℃<A≤8℃ or 0℃<A≤4℃, if the speed of the condensing fan 38 drops to 0r / min, the outlet temperature of the return air pipe 35 still does not reach the set temperature. At this time, if the initial flow entering the throttling device 33 is when the first capillary 331 is turned on, the first capillary 331 is switched to the second capillary 331 to reduce the flow entering the throttling device 33.

[0122] When the preset temperature difference range is -5℃≤A<-2℃, -10℃≤A<-5℃ or A<-10℃, if the speed of the condensing fan 38 is increased to the maximum speed, the outlet temperature of the return air pipe 35 still does not reach the set temperature. At this time, if the initial flow of the throttling device 33 is that the second capillary 331 is turned on, the second capillary 331 is switched to the first capillary 331. After a second preset time interval, the outlet temperature of the return air pipe 35 is detected again. If the outlet temperature of the return air pipe 35 is still unqualified, the first capillary 331 is switched to the first capillary 331 and the second capillary 331 are turned on at the same time. If the outlet temperature of the return air pipe 35 is qualified, the capillary 331 is no longer adjusted.

[0123] The embodiment of the present application also proposes a refrigerator control method, such as Fig.10 As shown, the refrigerator control method includes:

[0124] S1: obtaining the current outlet temperature of the return air pipe 35 and the current ambient temperature outside the refrigerator, and calculating the current temperature difference between the current outlet temperature and the current ambient temperature;

[0125] S2: Adjust the rotation speed of the condensing fan 38 according to the current temperature difference.

[0126] By adjusting the rotation speed of the condensing fan 38 according to the current temperature difference between the current outlet temperature of the return air duct 35 and the current ambient temperature outside the refrigerator, it is possible to avoid, to a certain extent, the excessive content of gaseous refrigerant in the refrigerant at the outlet of the first condenser 32 due to the change in the rotation speed of the condensing fan 38, thereby reducing the impact of the change in the rotation speed of the condensing fan 38 on the temperature of the return air duct 35, so as to avoid the return air duct 35 temperature being too low and resulting in high energy consumption of the refrigerator.

[0127] In some embodiments, Fig.11 As shown, adjusting the speed of the condensing fan 38 according to the current temperature difference includes:

[0128] S21: Determine the target temperature difference interval where the current temperature difference is located, where the target temperature difference interval is one of a plurality of preset temperature difference intervals between the outlet temperature and the ambient temperature;

[0129] S22: determining a target speed of the condensing fan 38 that needs to be adjusted according to a correspondence between a plurality of preset temperature difference intervals and a plurality of preset speeds that need to be adjusted of the condensing fan 38, wherein the target speed is one of the plurality of preset speeds;

[0130] S23: Adjust the rotation speed of the condensing fan 38 according to the target rotation speed.

[0131] Among them, Fig.12 As shown, adjusting the speed of the condensing fan 38 according to the current temperature difference specifically includes:

[0132] Determine whether the current temperature difference is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, and the first preset temperature is less than the second preset temperature;

[0133] If the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the speed of the condensing fan 38 is not adjusted;

[0134] If the current temperature difference is less than the first preset temperature, the speed of the condensing fan 38 is increased by the target speed;

[0135] If the current temperature difference is greater than the second preset temperature, the rotation speed of the condensing fan 38 is reduced by the target rotation speed.

[0136] Exemplarily, the correspondence between the plurality of preset temperature difference intervals and the plurality of preset rotation speeds is shown in Table 1. Fig.13 As shown, the entire steps of the refrigerator control method are:

[0137] Obtain the current outlet temperature of the return air pipe 35 and the current ambient temperature outside the refrigerator, and calculate the current temperature difference between the current outlet temperature and the current ambient temperature;

[0138] Determine whether the current temperature difference is greater than or equal to -2°C and less than or equal to 0°C;

[0139] If the current temperature difference is greater than or equal to -2°C and less than or equal to 0°C, the speed of the condensing fan 38 is not adjusted;

[0140] If the current temperature difference is less than -2°C, determine the target temperature difference range in which the current temperature difference lies;

[0141] If the target temperature difference interval is -5°C≤A<-2°C, the target speed of the condensing fan 38 is determined to be increased by 150 r / min. At this time, the speed of the condensing fan 38 is controlled to increase by 150 r / min;

[0142] If the target temperature difference interval is -10°C≤A<-5°C, the target speed of the condensing fan 38 is determined to be increased by 300 r / min. At this time, the speed of the condensing fan 38 is controlled to increase by 300 r / min;

[0143] If the target temperature difference interval is A<-10°C, the target speed of the condensing fan 38 is determined to be increased by 450 r / min. At this time, the speed of the condensing fan 38 is controlled to increase by 450 r / min;

[0144] If the current temperature difference is greater than 0°C, determine the target temperature difference range in which the current temperature difference lies;

[0145] If the target temperature difference interval is A>8°C, the target speed of the condensing fan 38 is determined to be reduced by 450r / min. At this time, the speed of the condensing fan 38 is controlled to be reduced by 450r / min;

[0146] If the target temperature difference interval is 4°C<A≤8°C, the target speed of the condensing fan 38 is determined to be reduced by 300 r / min. At this time, the speed of the condensing fan 38 is controlled to be reduced by 300 r / min;

[0147] If the target temperature difference interval is 0°C<A≤4°C, the target rotation speed of the condensing fan 38 is determined to be reduced by 150 r / min. At this time, the rotation speed of the condensing fan 38 is controlled to be reduced by 150 r / min.

[0148] In some embodiments, Fig.14 As shown, after adjusting the speed of the condensing fan 38 according to the target speed, the refrigerator control method further includes:

[0149] S24: determining a target speed of the condensing fan 38 that needs to be adjusted once every first preset time period, and adjusting the speed of the condensing fan 38 according to the target speed;

[0150] S25: until the speed of the condensing fan 38 increases to the maximum speed or decreases to the minimum speed, the flow regulating component 7 is controlled to regulate the flow of the refrigerant entering the throttling device 33.

[0151] Among them, Fig.15As shown, controlling the flow regulating component 7 to regulate the flow of the refrigerant entering the throttling device 33 includes:

[0152] Determine once at every second preset time whether the outlet temperature of the return air pipe 35 reaches the set temperature;

[0153] If the outlet temperature reaches the set temperature, the flow rate of the refrigerant entering the throttling device 33 is not adjusted;

[0154] If the outlet temperature does not reach the set temperature, when the current temperature difference is less than the first preset temperature, the flow rate of the refrigerant entering the throttling device 33 is increased once, and when the current temperature difference is greater than the first preset temperature, the flow rate of the refrigerant entering the throttling device 33 is reduced once.

[0155] In some embodiments, Fig.16 As shown, before adjusting the rotation speed of the condensing fan 38 according to the current temperature difference, the refrigerator control method further includes:

[0156] S10: Determine the target temperature interval where the current ambient temperature is located, where the target temperature interval is one of a plurality of preset temperature intervals outside the refrigerator;

[0157] S20: determining a target initial speed and a target initial flow rate corresponding to a target temperature range according to a preset mapping relationship; the target initial speed is one of a plurality of preset initial speeds of the condensing fan 38, and the target initial flow rate is one of a plurality of preset initial flow rates of the refrigerant entering the throttling device 33, and the mapping relationship is used to indicate that a preset temperature range corresponds to a preset initial speed and a preset initial flow rate;

[0158] S30: Control the condensing fan 38 to operate at the target initial speed, and adjust the flow rate of the refrigerant entering the throttling device 33 to the target initial flow rate.

[0159] Exemplarily, the correspondence between the plurality of preset temperature intervals and the plurality of preset initial rotation speeds and the plurality of preset initial flow rates is shown in Table 2. Fig.17 As shown, the refrigerator control method includes:

[0160] Get the current ambient temperature outside the refrigerator;

[0161] Determine the target temperature range where the current ambient temperature is located;

[0162] If the target temperature range is B>40°C, the preset initial speed determined according to the mapping relationship is 1150r / min, and the preset initial flow rate is that the first capillary 331 is turned on;

[0163] If the target temperature range is 36°C<B≤40°C, the preset initial speed determined according to the mapping relationship is 1000 r / min, and the preset initial flow rate is that the first capillary 331 is turned on;

[0164] If the target temperature range is 28°C<B≤36°C, the preset initial speed determined according to the mapping relationship is 800r / min, and the preset initial flow rate is that the first capillary 331 is turned on;

[0165] If the target temperature range is B≤28° C., the preset initial rotation speed determined according to the mapping relationship is 0 r / min, and the preset initial flow rate is that the second capillary 331 is turned on.

[0166] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the present application for which protection is claimed, those skilled in the art may understand and implement other variations of the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in the claims. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0167] Although the present application has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely exemplary illustrations of the present application as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

[0168] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A refrigerator, characterized in that: include: A refrigeration system, comprising a compressor, a first condenser, a throttling device, an evaporator and a return air pipe which are sequentially connected through pipelines to form a circulation loop of a refrigerant; The refrigeration system further comprises a condensing fan, wherein the condensing fan is used to blow air to the first condenser; A first temperature sensor is provided at the outlet of the return air duct and is used to detect the outlet temperature of the return air duct; A second temperature sensor is disposed outside the refrigerator and is used to detect the ambient temperature outside the refrigerator; A controller is connected to the condensing fan, the first temperature sensor and the second temperature sensor, and is configured as follows: Acquire the current outlet temperature of the return air duct and the current ambient temperature outside the refrigerator, and calculate the current temperature difference between the current outlet temperature and the current ambient temperature; The rotation speed of the condensing fan is adjusted according to the current temperature difference.

2. The refrigerator according to claim 1, characterized in that: The controller performs the step of adjusting the rotation speed of the condensing fan according to the current temperature difference, and is configured as follows: Determine a target temperature difference interval in which the current temperature difference lies, the target temperature difference interval being one of a plurality of preset temperature difference intervals between the outlet temperature and the ambient temperature; According to the correspondence between the plurality of preset temperature difference intervals and the plurality of preset speeds that need to be adjusted for the condensing fan, determining a target speed that needs to be adjusted for the condensing fan, wherein the target speed is one of the plurality of preset speeds; The rotation speed of the condensing fan is adjusted according to the target rotation speed.

3. The refrigerator according to claim 2, characterized in that: The controller performs the step of adjusting the rotation speed of the condensing fan according to the current temperature difference, and is specifically configured as follows: Determine whether the current temperature difference is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the first preset temperature being less than the second preset temperature; If the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the speed of the condensing fan is not adjusted; If the current temperature difference is less than the first preset temperature, increasing the speed of the condensing fan by the target speed; If the current temperature difference is greater than the second preset temperature, the rotation speed of the condensing fan is reduced by the target rotation speed.

4. The refrigerator according to claim 3, characterized in that: The refrigerator further comprises a flow regulating assembly, which is connected in series to the circulation loop and to the inlet of the throttling device, and is used to regulate the flow of the refrigerant entering the throttling device; After the controller performs the step of adjusting the speed of the condensing fan according to the target speed, the controller is configured as follows: Determining the target speed that the condensing fan needs to be adjusted once every first preset time period, and adjusting the speed of the condensing fan once according to the target speed; After the rotation speed of the condensing fan increases to a maximum rotation speed or decreases to a minimum rotation speed, the flow regulating component is controlled to regulate the flow of the refrigerant entering the throttling device.

5. The refrigerator according to claim 4, characterized in that: The controller executes the control of the flow regulating component to regulate the flow of the refrigerant entering the throttling device, and is configured as follows: determining once at a second preset time interval whether the outlet temperature of the return air pipe reaches a set temperature; If the outlet temperature reaches the set temperature, the flow rate of the refrigerant entering the throttling device is not adjusted; If the outlet temperature does not reach the set temperature, when the current temperature difference is less than the first preset temperature, the flow rate of the refrigerant entering the throttling device is increased once, and when the current temperature difference is greater than the first preset temperature, the flow rate of the refrigerant entering the throttling device is reduced once.

6. The refrigerator according to claim 4 or 5, characterized in that: The throttling device comprises a plurality of capillaries, and the outlets of the plurality of capillaries are connected to the inlet of the evaporator; The flow regulating component comprises an electric switching valve, which is connected to the inlets of the plurality of capillaries and is used to block or conduct at least one of the capillaries; The flow rates of the capillaries are different, and the electric switching valve adjusts the flow rate of the refrigerant entering the throttling device by connecting different capillaries or connecting different numbers of capillaries; Alternatively, the flow rates of the capillaries are the same, and the electric switching valve adjusts the flow rate of the refrigerant entering the throttling device by connecting different numbers of capillaries.

7. The refrigerator according to any one of claims 1 to 5, characterized in that: Before the controller performs the step of adjusting the rotation speed of the condensing fan according to the current temperature difference, the controller is further configured to: Determining a target temperature interval within which the current ambient temperature lies, the target temperature interval being one of a plurality of preset temperature intervals outside the refrigerator; According to a preset mapping relationship, a target initial speed and a target initial flow rate corresponding to the target temperature range are determined; the target initial speed is one of a plurality of preset initial speeds of the condensing fan, and the target initial flow rate is one of a plurality of preset initial flow rates of the refrigerant entering the throttling device, and the mapping relationship is used to indicate that one of the preset temperature ranges corresponds to one of the preset initial speeds and one of the preset initial flow rates; The condensing fan is controlled to operate according to the target initial speed, and the flow rate of the refrigerant entering the throttling device is adjusted to the target initial flow rate.

8. A refrigerator control method, characterized in that: include: Obtaining the current outlet temperature of the return air duct and the current ambient temperature outside the refrigerator, and calculating the current temperature difference between the current outlet temperature and the current ambient temperature; The rotation speed of the condensing fan is adjusted according to the current temperature difference.

9. The refrigerator control method according to claim 8, characterized in that: The adjusting the rotation speed of the condensing fan according to the current temperature difference comprises: Determine a target temperature difference interval in which the current temperature difference lies, the target temperature difference interval being one of a plurality of preset temperature difference intervals between the outlet temperature and the ambient temperature; According to the correspondence between the plurality of preset temperature difference intervals and the plurality of preset speeds that need to be adjusted for the condensing fan, determining a target speed that needs to be adjusted for the condensing fan, wherein the target speed is one of the plurality of preset speeds; The rotation speed of the condensing fan is adjusted according to the target rotation speed.

10. The refrigerator control method according to claim 9, characterized in that: The adjusting the speed of the condensing fan according to the target speed comprises: Determine whether the current temperature difference is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the first preset temperature being less than the second preset temperature; If the current temperature difference is greater than or equal to the first preset temperature and less than or equal to the second preset temperature, the speed of the condensing fan is not adjusted; If the current temperature difference is less than the first preset temperature, increasing the speed of the condensing fan by the target speed; If the current temperature difference is greater than the second preset temperature, the rotation speed of the condensing fan is reduced by the target rotation speed.

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