Condensing temperature control method and device for return air path of refrigerator and refrigerator

Abstract

The invention relates to the technical field of refrigerators, and discloses a condensation temperature control method for a refrigerator return air path. The condensation temperature control method for the refrigerator return air path comprises the steps that the current temperature of the surface of an evaporator is obtained; determining the current condenser pipe length corresponding to the current temperature according to the corresponding relation between the temperature and the condenser pipe length; and determining and communicating the condensation pipe with the corresponding length in the plurality of condensation pipes according to the current condensation pipe length. By adopting the condensing temperature control method for the return air path of the refrigerator, the frosting risk of the return air path and the evaporator can be reduced. The invention further discloses a condensation temperature control device of the refrigerator return air path and the refrigerator.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerators, and for example, to a method and device for controlling the condensing temperature of a return air duct of a refrigerator, and a refrigerator. Background Art

[0002] At present, refrigerators are divided into single-system refrigerators and multi-system refrigerators. The refrigerator compartment of a single-system refrigerator does not have a separate evaporator. The evaporator corresponding to the freezer compartment needs to supply air through the damper, and the air in the refrigerator compartment returns to the space where the evaporator is located through the return air duct. The air that enters the space where the evaporator is located through the return air duct is likely to cause frost on the evaporator.

[0003] In some existing technologies, part of the pipeline between the compressor and the evaporator can be used as a condenser for the return air duct to cool the return air duct. In the process of the air passing through the return air duct, the air is dehumidified to a certain extent, thereby reducing the risk of frost on the evaporator to a certain extent.

[0004] In the process of implementing the embodiments of the present application, it is found that there are at least the following problems in the related technology:

[0005] When the refrigeration power of the refrigerator is large, frost may easily form on the return air duct.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present application provide a method and device for controlling the condensation temperature of a return air duct of a refrigerator, and a refrigerator, so as to reduce the risk of frost on the return air duct.

[0009] In some embodiments, a return air duct is provided between the compartment and the space where the evaporator is located, and a plurality of parallel condensers are provided between the evaporator and the compressor in the refrigerator refrigeration system, and each condenser is provided in the return air duct for cooling the return air duct; a condensation temperature control method of the refrigerator return air duct comprises: obtaining the current temperature of the evaporator surface; determining the current condenser length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser length; determining and connecting a condenser of corresponding length among a plurality of condenser tubes according to the current condenser length.

[0010] Optionally, according to the correspondence between temperature and the length of the condenser, the current condenser length corresponding to the current temperature is determined, including: obtaining the current temperature interval in which the current temperature is located; according to the correspondence between the temperature interval and the length of the condenser, determining the current condenser length corresponding to the current temperature interval.

[0011] Optionally, the correspondence between the temperature and the length of the condenser is obtained in the following manner: in the process of controlling the refrigerator according to the correspondence between the temperature and the length of the condenser determined last time, the historical wall temperature of the tube wall of the return air duct and the historical air temperature passing through the return air duct are obtained; the correspondence between the temperature and the length of the condenser is adjusted according to the historical wall temperature and the historical air temperature, so that the temperature corresponding to the same length of the condenser becomes higher, lower or remains unchanged, thereby making it favorable for the wall temperature to be greater than 0°C and lower than the air temperature during the next operation of the refrigerator.

[0012] Optionally, the corresponding relationship between the temperature and the condenser tube length is adjusted according to the historical wall temperature and the historical air temperature, including any one of the following:

[0013] If the historical wall temperature is higher than or equal to the historical air temperature, then the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old corresponding relationship is adjusted, and a new corresponding relationship between the temperature and the condenser tube length is obtained, so that the condenser tube length corresponding to the same temperature in the new corresponding relationship is greater than the condenser tube length corresponding to the old corresponding relationship;

[0014] If the historical wall temperature is lower than or equal to zero degrees, the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old corresponding relationship is adjusted, and a new corresponding relationship between the temperature and the condenser tube length is obtained, so that the condenser tube length corresponding to the same temperature in the new corresponding relationship is smaller than the condenser tube length corresponding to the old corresponding relationship;

[0015] If the historical wall temperature is greater than 0°C and less than the historical air temperature, the corresponding relationship between the temperature and the condenser tube length remains unchanged;

[0016] The old corresponding relationship is the corresponding relationship between the temperature and the length of the condenser tube before adjustment.

[0017] Optionally, the historical wall temperature is higher than or equal to the historical air temperature, specifically: the historical wall temperature is higher than or equal to the maximum value of a preset wall temperature range.

[0018] Optionally, the historical wall temperature is greater than 0°C and less than the historical air temperature, specifically: the historical wall temperature is greater than 0°C and less than the maximum value of a preset wall temperature range.

[0019] Among them, the minimum value of the preset wall temperature range is 0°C, the maximum value of the preset wall temperature range is less than the historical air temperature, and the higher the historical air temperature, the greater the temperature difference between the historical air temperature and the maximum value of the preset wall temperature range.

[0020] Optionally, the corresponding relationship between the temperature and the length of the condenser is a one-to-one corresponding relationship between the temperature variation sequence and the condenser length variation sequence.

[0021] Optionally, adjusting the correspondence between the temperature and the condenser length includes: causing a relative misalignment between the temperature variation sequence and the condenser variation sequence in the correspondence between the temperature and the condenser length, thereby increasing or decreasing the temperature corresponding to each condenser length in the condenser length variation sequence.

[0022] Optionally, the evaporator and the compressor in the refrigerator refrigeration system are provided with conventional refrigerant pipelines, and the conventional refrigerant pipelines are connected to the inlets of the plurality of condensing tubes via a switching valve.

[0023] Optionally, before obtaining the current air temperature in the return air duct, the condensing temperature control method further includes: when air is supplied in the compartment, controlling the switching valve to connect to the condenser so that the refrigerant in the evaporator can return to the compressor through the condenser; when air is not supplied in the compartment, controlling the switching valve to connect to the conventional refrigerant pipeline and blocking the condenser so that the refrigerant returns directly from the evaporator to the compressor.

[0024] In some embodiments, a return air duct is provided between the compartment and the space where the evaporator is located, and a plurality of parallel condensers are provided between the evaporator and the compressor in the refrigerator refrigeration system, and each condenser is provided in the return air duct for cooling the return air duct; the condensing temperature control device of the refrigerator return air duct includes an acquisition module, a determination module and a control module; the acquisition module is used to obtain the current temperature of the evaporator surface; the determination module determines the current condenser length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser length; the execution module is used to determine and connect the condenser of corresponding length among the multiple condenser tubes according to the current condenser length.

[0025] In some embodiments, the condensing temperature control device of the refrigerator return air duct includes a processor and a memory storing program instructions, and the processor is configured to execute the condensing temperature control method of the refrigerator return air duct provided in the above embodiments when executing the program instructions.

[0026] In some embodiments, the refrigerator comprises:

[0027] Refrigerator body;

[0028] A return air duct is arranged between the compartment and the space where the evaporator is located. A plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system. Each condensing tube is arranged in the return air duct to cool the return air duct.

[0029] The condensing temperature control device for the return air duct of the refrigerator provided in the above-mentioned embodiment is installed on the refrigerator body.

[0030] The condensation temperature control method, device and refrigerator of the return air duct of the refrigerator provided in the embodiments of the present application can achieve the following technical effects:

[0031] The lengths of multiple parallel condensing tubes are different. By adjusting the length of the condensing tubes, the wall surface temperature of the inner wall of the return air duct can be adjusted. By determining the current condensing tube length according to the current temperature of the evaporator surface and connecting the condensing tubes of corresponding length, the length of the condensing tube for cooling the return air duct can be matched with the current temperature of the evaporator surface. When the refrigeration power of the refrigerator is large, the wall surface temperature of the inner wall of the return air duct will not be too low, reducing the risk of frost on the return air duct.

[0032] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] One or more embodiments are exemplarily described by corresponding drawings, and these exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are regarded as similar elements, and wherein:

[0034] Figure 1a and Figure 1b It is a schematic diagram of the implementation structure of a method for controlling the condensing temperature of a return air duct of a refrigerator provided in an embodiment of the present application;

[0035] Figure 2 It is a flow chart of a method for controlling the condensing temperature of a return air duct of a refrigerator provided in an embodiment of the present application;

[0036] Figure 3 It is a flow chart of a method for controlling the condensing temperature of a return air duct of a refrigerator provided in an embodiment of the present application;

[0037] Figure 4 It is a flow chart of a method for controlling the condensing temperature of a return air duct of a refrigerator provided in an embodiment of the present application;

[0038] Figure 5 It is a schematic diagram of a condensing temperature control device for a return air duct of a refrigerator provided in an embodiment of the present application;

[0039] Figure 6It is a schematic diagram of a condensing temperature control device for a return air duct of a refrigerator provided in an embodiment of the present application;

[0040] Figure 7 It is a schematic diagram of a refrigerator provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to be able to understand the features and technical contents of the embodiments of the present application in more detail, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, in the absence of these details, one or more embodiments can still be implemented. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0042] The terms "first", "second", etc. in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present application described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0043] Unless otherwise stated, the term "plurality" means more than two.

[0044] In the embodiment of the present application, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0045] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0046] Figure 1a and Figure 1b It is a schematic diagram of the implementation structure of a method for controlling the condensing temperature of a refrigerator return air duct provided in an embodiment of the present application.

[0047] Combination Figure 1a As shown, the refrigeration system of the refrigerator includes a compressor 11, a condenser 12, a throttling device 13, an evaporator 14, a switching valve 15, a condenser 16 (16-1 to 16-N, N is an integer greater than 1) and a conventional refrigerant pipeline 17.

[0048] The compressor 11 is connected to the condenser 12, and the refrigerant can flow from the compressor 11 to the condenser 12; the condenser 12 is connected to the throttling device 13, and the refrigerant can flow from the condenser 12 to the throttling device 13; the throttling device 13 is connected to the evaporator 14, and the refrigerant can flow from the throttling device 13 to the evaporator 14; the evaporator 14 is connected to the condenser pipe 16 and the conventional refrigerant pipeline 17 through the switching valve 15. In the first working state, the switching valve 15 can For any one of the tubes 16-1, 16-2, 16-3...16-N, at the same time, only one of the condenser tubes 16-1, 16-2, 16-3...16-N has refrigerant flowing through it; when the switching valve 15 is in the second working state, the refrigerant can flow from the evaporator 14 to the conventional refrigerant pipeline 17; the outlets of the condenser tube 16 and the conventional refrigerant pipeline 17 merge and are connected to the compressor 11 together, and the refrigerant flowing out of the condenser tube 16 and / or the condenser tube 17 can flow to the compressor 11.

[0049] Among the plurality of parallel condensing tubes 16 , the lengths of every two condensing tubes 16 are different.

[0050] When the switching valve 15 is in the first working state, the refrigerant can flow from the evaporator 14 to the condenser 16, and the conventional refrigerant pipeline 17 can be partially blocked. That is, the refrigerant can also flow from the evaporator 14 to the conventional refrigerant pipeline 17 at the same time, or the conventional refrigerant pipeline 17 is completely blocked.

[0051] When the switching valve 15 is in the second working state, the refrigerant can flow from the evaporator 14 to the conventional refrigerant pipeline 17. At this time, one of the condensers 16-1, 16-2, 16-3...16-N can be partially blocked, or the condenser 16 can be completely blocked.

[0052] In the first working state, the conventional refrigerant pipeline 17 is partially blocked, and in the second working state, one of the condensers 16 is partially blocked. The refrigerant flow of one of the condensers 16 in the first working state is greater than the refrigerant flow of one of the condensers 16 in the second working state; the refrigerant flow in the conventional refrigerant pipeline 17 in the first working state is less than the refrigerant flow in the conventional refrigerant pipeline 17 in the second working state.

[0053] like Figure 1b As shown, a return air duct 21 is arranged between the compartment and the space where the evaporator 14 is located, and a plurality of parallel condensing tubes 16 are arranged between the evaporator 14 and the compressor 11 in the refrigerator refrigeration system, and each condensing tube 16 is arranged in the return air duct 21 for cooling the return air duct 21.

[0054] The air in the cold storage room can flow to the space where the evaporator 14 is located through the return air duct 21, and the air in the freezer room can flow to the space where the evaporator 14 is located through the freezing return air port 22; a wall temperature sensor 20 can be set on the wall of the return air duct 21 to detect the wall temperature of the return air duct 21 pipe wall, and an air temperature sensor 19 can be set on the wall of the return air duct 21 to detect the air temperature in the return air duct 21.

[0055] The condenser 16 can be disposed around the return air duct 21 and disposed on the outer surface of the tube wall of the return air duct 21 .

[0056] The throttling device 13 may be a capillary tube or a throttling valve.

[0057] A temperature sensor 23 is provided on the surface of the evaporator 14 for detecting the temperature of the surface of the evaporator 14 .

[0058] Of course, a fan 18 may also be provided in the space where the evaporator 14 is located, so as to provide power for air circulation in the refrigerating chamber or the freezing chamber.

[0059] In the embodiment of the present application, the compartment may be the above-mentioned refrigeration compartment or the above-mentioned freezer compartment.

[0060] Figure 2 The present invention is a flowchart of a method for controlling the condensing temperature of a refrigerator return air duct provided in an embodiment of the present application. The condensing temperature control method can be executed in a refrigerator controller, or in an independent controller other than the refrigerator controller, or in a smart home system, or in a server of the smart home system.

[0061] In the refrigerator, a return air duct is arranged between the compartment and the space where the evaporator is located, and a plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system, and each condensing tube is arranged in the return air duct to cool the return air duct.

[0062] Combination Figure 2 As shown, the condensation temperature control method of the return air path of the refrigerator includes:

[0063] S201. Obtain the current temperature of the evaporator surface.

[0064] For example, through Figure 1b The temperature sensor 23 disposed on the surface of the evaporator 14 detects the current temperature of the evaporator surface.

[0065] In the refrigeration system, the temperature of the evaporator surface has a corresponding relationship with the evaporation temperature, evaporation pressure and return air temperature of the compressor inside the evaporator.

[0066] Obtaining the temperatures of other parts associated with the temperature of the evaporator surface should also be regarded as obtaining the temperature of the evaporator surface.

[0067] S202. Determine the current condenser length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser length.

[0068] The corresponding relationship between the temperature and the length of the condenser tube can make the cooling effect of the condenser tube on the return air duct relatively consistent.

[0069] Those skilled in the art can obtain the corresponding relationship between temperature and condenser length through experiments. For example, when the temperature of the evaporator surface is the first evaporator temperature, a condenser with a first length is selected so that the wall temperature of the return air duct can be reduced from the first wall temperature to the second wall temperature within a set time; the temperature of the return air duct is restored to the first wall temperature, and the operating parameters of the refrigeration system are adjusted, such as adjusting the opening of the throttling device, the operating frequency of the compressor, etc., so that the temperature of the evaporator surface is the second evaporator temperature, and then a condenser with a second length is selected, so that the wall temperature of the return air duct can be reduced from the first wall temperature to the second wall temperature within a set time. In this way, the corresponding relationship between temperature and condenser length includes: the corresponding relationship between the first evaporator temperature and the first length, and the corresponding relationship between the second evaporator temperature and the second length. And so on, which will not be repeated here.

[0070] The correspondence between the temperature and the length of the condenser tube can be stored in the form of a one-to-one correspondence data table. After obtaining the current temperature, the current condenser tube length corresponding to the current temperature can be obtained by querying the data table.

[0071] Optionally, according to the correspondence between temperature and the length of the condenser, the current condenser length corresponding to the current temperature is determined, including: obtaining the current temperature interval in which the current temperature is located; according to the correspondence between the temperature interval and the length of the condenser, determining the current condenser length corresponding to the current temperature interval.

[0072] The temperature variation range of the evaporator surface is relatively large. The more the number of condensing tubes in parallel is, the higher the processing requirements are and the greater the production difficulty is. By dividing the temperature variation range of the evaporator surface into multiple temperature intervals, and then establishing a corresponding relationship between the temperature intervals and the length of the condensing tubes, a smaller number of temperature intervals correspond to a smaller number of condensing tubes one by one. In the case of a large temperature variation range of the evaporator surface, the current condensing tube length corresponding to the current temperature can also be determined.

[0073] S203. Determine and connect a condenser of corresponding length among multiple condensers according to the current condenser length.

[0074] The lengths of multiple parallel condensing tubes are different. By adjusting the length of the condensing tubes, the wall surface temperature of the inner wall of the return air duct can be adjusted. By determining the current condensing tube length according to the current temperature of the evaporator surface and connecting the condensing tubes of corresponding length, the length of the condensing tube for cooling the return air duct can be matched with the current temperature of the evaporator surface. When the refrigeration power of the refrigerator is large, the wall surface temperature of the inner wall of the return air duct will not be too low, reducing the risk of frost on the return air duct.

[0075] Figure 3 The present invention is a flowchart of a method for controlling the condensing temperature of a refrigerator return air duct provided in an embodiment of the present application. The condensing temperature control method can be executed in a refrigerator controller, or in an independent controller other than the refrigerator controller, or in a smart home system, or in a server of the smart home system.

[0076] In the refrigerator, a return air duct is arranged between the compartment and the space where the evaporator is located, and a plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system, and each condensing tube is arranged in the return air duct to cool the return air duct.

[0077] Combination Figure 3 As shown, the condensation temperature control method of the return air path of the refrigerator includes:

[0078] S301, obtaining the corresponding relationship between temperature and condenser length.

[0079] The corresponding relationship between the temperature and the length of the condenser tube may be fixed or dynamically changing. This embodiment exemplifies the case where the corresponding relationship between the temperature and the length of the condenser tube changes dynamically.

[0080] Optionally, the correspondence between the temperature and the length of the condenser is obtained in the following manner: in the process of controlling the refrigerator according to the correspondence between the temperature and the length of the condenser determined last time, the historical wall temperature of the tube wall of the return air duct and the historical air temperature passing through the return air duct are obtained; the correspondence between the temperature and the length of the condenser is adjusted according to the historical wall temperature and the historical air temperature, so that the temperature corresponding to the same length of the condenser becomes higher, lower or remains unchanged, thereby making it favorable for the wall temperature to be greater than 0°C and lower than the air temperature during the next operation of the refrigerator.

[0081] In the embodiment of the present application, the general adjustment method for the correspondence between the temperature and the length of the condenser is to make the temperature corresponding to the same length of the condenser higher, lower or remain unchanged, and the adjustment target is to make the wall temperature greater than 0°C and lower than the air temperature during the next operation. Technical personnel in this field can set a specific adjustment method based on the general adjustment method and adjustment target and their own experience.

[0082] S302: Obtain the current temperature of the evaporator surface.

[0083] There is no order in which S302 of obtaining the current temperature of the evaporator surface and S301 of obtaining the corresponding relationship between the temperature and the length of the condenser tube are performed.

[0084] S303. Determine the current condenser length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser length.

[0085] S304. Determine and connect a condenser of corresponding length among multiple condensers according to the current condenser length.

[0086] In the application scenario of the refrigerator, different types and quantities of items stored in the compartment by users, as well as different usage habits of users, will lead to different set temperatures and actual temperatures in the compartment, and different air temperatures passing through the return air duct. The different air temperatures passing through the return air duct will further lead to changes in the temperature of the inner wall of the return air duct.

[0087] In the embodiment of the present application, in the process of controlling the operation of the refrigerator according to the corresponding relationship between the last determined temperature and the condenser length, the historical wall temperature and the historical air temperature of the return air duct can be used to evaluate the frost risk of the return air duct and the frost risk of the evaporator. When the temperature corresponding to the same condenser length becomes higher, it means that the cooling effect on the return air duct is weakened. When the temperature corresponding to the same condenser length becomes lower, it means that the cooling effect on the return air duct is enhanced. When the temperature corresponding to the same condenser length is maintained unchanged, it means that the cooling effect on the return air duct remains unchanged. The purpose of this is to make the wall temperature greater than 0°C and lower than the air temperature during the next operation of the refrigerator.

[0088] When the wall temperature is greater than 0°C and lower than the air temperature, the risk of frost in the return air duct is low or non-existent, and the return air duct can reduce the air passing through it to increase the relative humidity of the air, making it easier for condensation to occur in the return air duct to reduce the absolute moisture content in the air, thereby helping to reduce the risk of frost on the evaporator.

[0089] The specific adjustment method of the corresponding relationship between temperature and condenser tube length is exemplified below.

[0090] Optionally, adjusting the correspondence between the temperature and the condenser tube length according to the historical wall temperature and the historical air temperature includes: if the historical wall temperature is higher than or equal to the historical air temperature, adjusting the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old correspondence, and obtaining a new correspondence between the temperature and the condenser tube length, so that the condenser tube length corresponding to the same temperature in the new correspondence is greater than the condenser tube length corresponding to the old correspondence. The old correspondence is the correspondence between the temperature and the condenser tube length before adjustment.

[0091] Alternatively, adjusting the correspondence between the temperature and the condenser tube length according to the historical wall temperature and the historical air temperature may include: if the historical wall temperature is lower than or equal to zero degrees, adjusting the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old correspondence, and obtaining a new correspondence between the temperature and the condenser tube length, so that the condenser tube length corresponding to the same temperature in the new correspondence is smaller than the condenser tube length corresponding to the old correspondence. The old correspondence is the correspondence between the temperature and the condenser tube length before adjustment.

[0092] Alternatively, adjusting the correspondence between the temperature and the length of the condenser tube according to the historical wall temperature and the historical air temperature may include: if the historical wall temperature is greater than 0°C and less than the historical air temperature, maintaining the correspondence between the temperature and the length of the condenser tube unchanged, wherein the old correspondence is the correspondence between the temperature and the length of the condenser tube before the adjustment.

[0093] In the above embodiment, the magnitude relationship between the historical wall temperature and the historical air temperature can be obtained by the following method:

[0094] In the process of controlling the refrigerator according to the corresponding relationship between the temperature determined last time and the length of the condenser tube, a comparison result of each historical wall temperature and the historical air temperature at the same time is obtained. If the comparison result is that the number of historical wall temperatures less than the historical air temperature accounts for more than a set proportion of the total number of comparison results, it is determined that the historical wall temperature is lower than the historical air temperature;

[0095] If the comparison result is that the number of historical wall temperatures greater than or equal to the historical air temperature is below a set ratio of the total number of comparison results, it is determined that the historical wall temperature is greater than or equal to the historical air temperature.

[0096] The setting ratio can be one-half.

[0097] Further, the setting ratio may be two-thirds, three-quarters, four-fifths or greater.

[0098] When the set ratio is greater than one-half, it is more likely that the historical wall temperature is greater than or equal to the historical air temperature. In this case, it is necessary to adjust the correspondence between the temperature and the length of the condenser tube to increase the cooling effect on the return air duct, which is beneficial to improve the condensation effect of the return air duct on the air and reduce the risk of frosting on the evaporator; and, when the historical wall temperature fluctuates above and below the historical air temperature, it means that the temperature interval between the historical wall temperature and 0°C is relatively large. In this case, even if the cooling effect on the return air duct is increased, it is not easy for the wall temperature to be lower than or equal to 0°C during the next operation, that is, the risk of frosting on the return air duct will not be increased.

[0099] In this way, setting the ratio to be greater than one-half can reduce the risk of frost on the evaporator by reducing the contact of frost on the return air duct.

[0100] Optionally, the historical wall temperature is higher than or equal to the historical air temperature, specifically: the historical wall temperature is higher than or equal to the maximum value of a preset wall temperature range.

[0101] Optionally, the historical wall temperature is greater than 0°C and less than the historical air temperature, specifically: the historical wall temperature is greater than 0°C and less than the maximum value of a preset wall temperature range.

[0102] Among them, the minimum value of the preset wall temperature range is 0°C, the maximum value of the preset wall temperature range is less than the historical air temperature, and the higher the historical air temperature, the greater the temperature difference between the historical air temperature and the maximum value of the preset wall temperature range.

[0103] The minimum value of the wall temperature range is greater than 0°C, which can prevent the air from frosting in the return air duct as much as possible. The maximum value of the wall temperature range is less than the air temperature, which can enable the return air duct to cool the air flowing into it. During the air cooling process, the relative humidity in the air continues to increase. After reaching 100%, condensation occurs on the inner side of the return air duct wall, which can reduce the humidity in the air.

[0104] The higher the air temperature, the higher the absolute water content in the air when the relative humidity of the air remains unchanged. In this case, the greater the temperature difference between the air temperature and the maximum value of the wall temperature range, the wall temperature within the wall temperature range can cause a greater cooling amplitude of the air flowing into the return air duct; when the relative humidity of the air remains unchanged, the greater the cooling amplitude, the more water is precipitated from the air, the more the absolute water content of the air entering the space where the evaporator is located decreases, and the risk of frosting on the evaporator is reduced.

[0105] Because the minimum value of the wall temperature range is greater than 0°C, and the maximum value of the wall temperature range is lower than the air temperature, the lower the air temperature, the smaller the temperature span of the wall temperature range (the temperature difference between the maximum and minimum values ​​of the wall temperature range). In this case, the lower the air temperature, the smaller the temperature difference between the air temperature and the maximum value of the wall temperature range. On the basis of reducing the risk of frost on the evaporator and the return air duct, the temperature span of the wall temperature range can be expanded to a certain extent.

[0106] In some specific application examples, the range of air temperature and wall temperature is shown in Table 1:

[0107] Table 1 Correspondence between air temperature and wall temperature range

[0108] Air temperature (℃) Wall temperature range(℃) 1 (0，0.3] 2 (0，1.29] 3 (0，2.28] 4 (0，3.27] 5 (0，4.27] 6 (0，5.26] 7 (0，6.26] 8 (0，7.25] 9 (0，8.25]

[0109] The correspondence between the air temperature and the wall temperature range in the above table is for illustrative purposes only and does not limit the specific numerical values ​​of the correspondence between the air temperature and the wall temperature range. Those skilled in the art can set the specific correspondence between the air temperature and the wall temperature range that conforms to the actual situation based on the above description of the correspondence between the air temperature and the wall temperature range.

[0110] The following further describes the adjustment process of the corresponding relationship between temperature and condenser tube length.

[0111] Optionally, the corresponding relationship between the temperature and the length of the condenser is a one-to-one corresponding relationship between the temperature variation sequence and the condenser length variation sequence.

[0112] On this basis, the correspondence between the temperature and the condenser length is adjusted, including: causing a relative misalignment between the temperature variation sequence and the condenser variation sequence in the correspondence between the temperature and the condenser length, thereby increasing or decreasing the temperature corresponding to each condenser length in the condenser length variation sequence.

[0113] In the corresponding relationship between the temperature and the length of the condenser tube, the length of the condenser tube corresponds to the actual length of the condenser tube provided in the refrigerator.

[0114] The temperature in the corresponding relationship between the temperature and the length of the condenser tube can be a temperature value. In this case, each element in the above temperature gradient sequence is a temperature value. As shown in Table 2:

[0115] Table 2 Corresponding relationship between temperature before adjustment and condenser length

[0116] Condenser tube length (mm) Temperature(℃) T1 L1 T2 L2 T3 L3 T4 L4 T5 T6 T7

[0117] Among them, L1>L2>L3>L4, T1>T2>T3>T4>T5>T6>T7. The table shows that: when the temperature T is greater than or equal to T2, the length of the condenser is L1; when the temperature T is less than T2 and greater than or equal to T3, the length of the condenser is L2; ​​when the temperature T is less than T3 and greater than or equal to T4, the length of the condenser is L3; when the temperature T is less than T4, the length of the condenser is L4.

[0118] One way in which the temperature variation sequence and the condenser variation sequence in the above corresponding relationship are relatively misaligned is shown in Table 2.1:

[0119] Table 2.1 Correspondence between temperature and condenser length One way of misalignment

[0120]

[0121]

[0122] In this way, the temperature corresponding to each condenser length in the condenser length variation sequence is increased.

[0123] One way in which the temperature variation sequence and the condenser variation sequence in the above corresponding relationship are relatively misaligned is shown in Table 2.2:

[0124] Table 2.2 Correspondence between temperature and condenser length Another way to produce misalignment

[0125] Condenser tube length (mm) Temperature(℃) T1 T2 L1 T3 L2 T4 L3 T5 L4 T6 T7

[0126] In this way, the temperature corresponding to each condenser length in the condenser length variation sequence is reduced.

[0127] The above embodiments are only described by taking L1>L2>L3>L4, T1>T2>T3>T4>T5>T6>T7 as an example. When L1<L2<L3<L4, T1<T2<T3<T4<T5<T6<T7, those skilled in the art may implement them according to the above embodiments, which will not be described in detail here.

[0128] In addition, the corresponding relationship between temperature and condenser length can also be a temperature range. In this case, each element in the above temperature gradient sequence is a temperature range, and there is no intersection between the temperature ranges. As shown in Table 3:

[0129] Table 3 Corresponding relationship between temperature before adjustment and condenser length

[0130] Condenser tube length (mm) Temperature(℃) (T1, T2] L1 (T2, T3] L2 (T3, T4] L3 (T4, T5] L4 (T5, T6] (T6, T7] (T7, T8]

[0131] Among them, L1>L2>L3>L4, T1>T2>T3>T4>T5>T6>T7>T8. The table shows that: when the temperature is T∈(T2, T3], the length of the condenser is L1; when the temperature is T∈(T3, T4], the length of the condenser is L2; ​​when the temperature is T∈(T4, T5], the length of the condenser is L3; when the temperature is T∈(T5, T6], the length of the condenser is L4.

[0132] One way in which the temperature variation sequence and the condenser variation sequence in the above corresponding relationship are relatively misaligned is shown in Table 3.1:

[0133] Table 3.1 Correspondence between temperature and condenser length One way of misalignment

[0134] Condenser tube length (mm) Temperature(℃) L1 (T1, T2] L2 (T2, T3] L3 (T3, T4] L4 (T4, T5] (T5, T6] (T6, T7] (T7, T8]

[0135] In this way, the temperature corresponding to each condenser length in the condenser length variation sequence is increased.

[0136] Table 3.2 Correspondence between temperature and condenser length Another way to produce misalignment

[0137] Condenser tube length (mm) Temperature(℃) (T1, T2] (T2, T3] L1 (T3, T4] L2 (T4, T5] L3 (T5, T6] L4 (T6, T7] (T7, T8]

[0138] In this way, the temperature corresponding to each condenser length in the condenser length variation sequence is reduced.

[0139] The above embodiments are only illustrated by taking L1>L2>L3>L4, T1>T2>T3>T4>T5>T6>T7>T8 as an example. When L1<L2<L3<L4, T1<T2<T3<T4<T5<T6<T7<T8, those skilled in the art may implement them according to the above embodiments, which will not be described one by one here.

[0140] Figure 4 The present invention is a flowchart of a method for controlling the condensing temperature of a refrigerator return air duct provided in an embodiment of the present application. The condensing temperature control method can be executed in a refrigerator controller, or in an independent controller other than the refrigerator controller, or in a smart home system, or in a server of the smart home system.

[0141] In the refrigerator, a return air duct is arranged between the compartment and the space where the evaporator is located, and a plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system, and each condensing tube is arranged in the return air duct to cool the return air duct.

[0142] The evaporator and the compressor in the refrigerator refrigeration system are provided with conventional refrigerant pipelines, and the conventional refrigerant pipelines are connected to the inlets of a plurality of condensing tubes through a switching valve.

[0143] Combination Figure 4 As shown, the condensation temperature control method of the return air path of the refrigerator includes:

[0144] S401. When there is no air supply in the room, the switching valve is controlled to connect the conventional refrigerant pipeline and block the condenser pipe, so that the refrigerant returns directly from the evaporator to the compressor.

[0145] The compartment may be a refrigerator compartment or a freezer compartment of a refrigerator, or may be a compartment separated from a refrigerator compartment or a freezer compartment of a refrigerator.

[0146] S402. When air is supplied to the room, the switching valve is controlled to connect the condenser pipe so that the refrigerant in the evaporator can return to the compressor through the condenser pipe.

[0147] S403: Obtain the current temperature of the evaporator surface.

[0148] S404. Determine the current condenser length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser length.

[0149] S405. Determine and connect a condenser of corresponding length among multiple condensers according to the current condenser length.

[0150] By distinguishing between the cases where air is supplied to the room and the cases where air is not supplied, adaptive control of anti-frost on the return air duct is achieved.

[0151] Figure 5 Schematic diagram of a condensing temperature control device for a refrigerator return air duct provided in an embodiment of the present application. The condensing temperature control device can be implemented in the form of software, hardware or a combination of the two.

[0152] In the refrigerator, a return air duct is arranged between the compartment and the space where the evaporator is located, and a plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system, and each condensing tube is arranged in the return air duct to cool the return air duct.

[0153] Combination Figure 5 As shown, the condensing temperature control device 50 for the return air duct of the refrigerator includes an obtaining module 51, a determining module 52 and an executing module 53.

[0154] The obtaining module 51 is used to obtain the current temperature of the evaporator surface;

[0155] The determination module 52 determines the current condenser tube length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser tube length;

[0156] The execution module 53 is used to determine and connect a condenser tube of corresponding length among the multiple condensers according to the current condenser tube length.

[0157] Optionally, the determination module 52 includes an acquisition unit and a determination unit. The acquisition unit is used to acquire the current temperature interval in which the current temperature is located; the determination unit is used to determine the current condenser tube length corresponding to the current temperature interval according to the corresponding relationship between the temperature interval and the condenser tube length.

[0158] Optionally, the correspondence between the temperature and the length of the condenser is obtained in the following manner: in the process of controlling the refrigerator according to the correspondence between the temperature and the length of the condenser determined last time, the historical wall temperature of the tube wall of the return air duct and the historical air temperature passing through the return air duct are obtained; the correspondence between the temperature and the length of the condenser is adjusted according to the historical wall temperature and the historical air temperature, so that the temperature corresponding to the same length of the condenser becomes higher, lower or remains unchanged, thereby making it favorable for the wall temperature to be greater than 0°C and lower than the air temperature during the next operation of the refrigerator.

[0159] Optionally, the corresponding relationship between the temperature and the condenser tube length is adjusted according to the historical wall temperature and the historical air temperature, including any one of the following:

[0160] If the historical wall temperature is higher than or equal to the historical air temperature, then the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old corresponding relationship is adjusted, and a new corresponding relationship between the temperature and the condenser tube length is obtained, so that the condenser tube length corresponding to the same temperature in the new corresponding relationship is greater than the condenser tube length corresponding to the old corresponding relationship;

[0161] If the historical wall temperature is lower than or equal to zero degrees, the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old corresponding relationship is adjusted, and a new corresponding relationship between the temperature and the condenser tube length is obtained, so that the condenser tube length corresponding to the same temperature in the new corresponding relationship is smaller than the condenser tube length corresponding to the old corresponding relationship;

[0162] If the historical wall temperature is greater than 0°C and less than the historical air temperature, the corresponding relationship between the temperature and the condenser tube length remains unchanged;

[0163] The old corresponding relationship is the corresponding relationship between the temperature and the length of the condenser tube before adjustment.

[0164] Optionally, the historical wall temperature is higher than or equal to the historical air temperature, specifically: the historical wall temperature is higher than or equal to the maximum value of a preset wall temperature range.

[0165] Optionally, the historical wall temperature is greater than 0°C and less than the historical air temperature, specifically: the historical wall temperature is greater than 0°C and less than the maximum value of a preset wall temperature range.

[0166] Among them, the minimum value of the preset wall temperature range is 0°C, the maximum value of the preset wall temperature range is less than the historical air temperature, and the higher the historical air temperature, the greater the temperature difference between the historical air temperature and the maximum value of the preset wall temperature range.

[0167] Optionally, the correspondence between the temperature and the length of the condenser is a one-to-one correspondence between the temperature variation sequence and the condenser length variation sequence; and adjusting the correspondence between the temperature and the length of the condenser includes:

[0168] The temperature variation sequence and the condenser variation sequence in the corresponding relationship between the temperature and the condenser length are relatively misaligned, so that the temperature corresponding to each condenser length in the condenser length variation sequence is increased or decreased.

[0169] Optionally, the evaporator and the compressor in the refrigerator refrigeration system are provided with conventional refrigerant pipelines, and the conventional refrigerant pipelines are connected to the inlets of the plurality of condensing tubes via a switching valve.

[0170] Optionally, before obtaining the current air temperature in the return air duct, the condensing temperature control method further includes: when air is supplied in the compartment, controlling the switching valve to connect to the condenser so that the refrigerant in the evaporator can return to the compressor through the condenser; when air is not supplied in the compartment, controlling the switching valve to connect to the conventional refrigerant pipeline and blocking the condenser so that the refrigerant returns directly from the evaporator to the compressor.

[0171] In some embodiments, the condensing temperature control device of the refrigerator return air duct includes a processor and a memory storing program instructions, and the processor is configured to execute the condensing temperature control method of the refrigerator return air duct provided in the above embodiments when executing the program instructions.

[0172] Figure 6 Schematic diagram of a condensing temperature control device for a refrigerator return air duct provided in an embodiment of the present application. Figure 6 As shown, the condensing temperature control device 60 of the refrigerator return air duct includes:

[0173] The processor 61 and the memory 62 may also include a communication interface 63 and a bus 64. The processor 61, the communication interface 63, and the memory 62 may communicate with each other through the bus 64. The communication interface 63 may be used for information transmission. The processor 61 may call the logic instructions in the memory 62 to execute the condensation temperature control method of the return air path of the refrigerator provided in the aforementioned embodiment.

[0174] In addition, the logic instructions in the memory 62 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

[0175] The memory 62 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present application. The processor 61 executes functional applications and data processing by running the software programs, instructions, and modules stored in the memory 62, that is, implementing the methods in the above method embodiments.

[0176] The memory 62 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 62 may include a high-speed random access memory and may also include a non-volatile memory.

[0177] Figure 7 It is a schematic diagram of a refrigerator provided in an embodiment of the present application.

[0178] Combination Figure 7 As shown, the refrigerator 70 includes: a refrigerator body 71, and the above-mentioned condensing temperature control device 50 (60) for the return air duct of the refrigerator. The condensing temperature control device 50 (60) for the return air duct of the refrigerator is installed on the refrigerator body 71. The installation relationship described here is not limited to placement inside the refrigerator body 71, but also includes installation connections with other components of the refrigerator 70, including but not limited to physical connections, electrical connections or signal transmission connections. It can be understood by those skilled in the art that the condensing temperature control device 50 (60) for the return air duct of the refrigerator can be adapted to a feasible refrigerator body 71, thereby realizing other feasible embodiments.

[0179] The present application embodiment provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured as follows:

[0180] Get the current temperature of the evaporator surface;

[0181] According to the corresponding relationship between temperature and condenser tube length, determine the current condenser tube length corresponding to the current temperature;

[0182] Determine and connect a condenser tube of corresponding length among the multiple condensers according to the current condenser tube length;

[0183] Among them, a return air duct is arranged between the compartment and the space where the evaporator is located, and a plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system, and each condensing tube is arranged in the return air duct to cool the return air duct.

[0184] The above-mentioned computer-readable storage medium may be a transient computer-readable storage medium.

[0185] The technical solution of the embodiment of the present application can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method in the embodiment of the present application. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0186] The above description and the accompanying drawings fully illustrate the embodiments of the present application so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms as well. In addition, when used in this application, the term "comprise" and its variants "comprises" and / or including (comprising) refer to the existence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or these groups. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same or similar parts between the embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0187] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. Technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the embodiments of the present application. Technicians can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0188] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of units can be only a logical function division, and there can be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, which may be located in one place or distributed on multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0189] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present application. In this regard, each square box in the flow chart or block diagram can represent a part of a module, program segment or code, and a part of a module, program segment or code includes one or more executable instructions for realizing the logical function of the specification. In some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can also be executed in the opposite order sometimes, which can depend on the functions involved. Each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be realized by a dedicated hardware-based system that performs the function or action of the specification, or can be realized by a combination of special-purpose hardware and computer instructions.

Claims

1. A method for controlling the condensation temperature of a refrigerator return air duct, characterized in that: A return air path is provided between the compartment and the space where the evaporator is located, and a plurality of parallel condensing tubes are provided between the evaporator and the compressor in the refrigerator refrigeration system, and each condensing tube is provided in the return air path for cooling the return air path; the condensation temperature control method comprises: Get the current temperature of the evaporator surface; According to the corresponding relationship between temperature and condenser tube length, determine the current condenser tube length corresponding to the current temperature; According to the current length of the condenser, a condenser of corresponding length is determined among the multiple condensers and connected.

2. The condensation temperature control method according to claim 1, characterized in that: According to the corresponding relationship between the temperature and the length of the condenser tube, the current condenser tube length corresponding to the current temperature is determined, including: Get the current temperature range where the current temperature is located; According to the corresponding relationship between the temperature range and the condenser tube length, the current condenser tube length corresponding to the current temperature range is determined.

3. The condensation temperature control method according to claim 1, characterized in that: The corresponding relationship between temperature and condenser length is obtained as follows: In the process of controlling the refrigerator according to the corresponding relationship between the temperature determined last time and the length of the condenser tube, a historical wall temperature of the tube wall of the return air duct and a historical air temperature passing through the return air duct are obtained; The corresponding relationship between temperature and condenser length is adjusted according to the historical wall temperature and the historical air temperature, so that the temperature corresponding to the same condenser length becomes higher, lower or remains unchanged, thereby making it favorable for the wall temperature to be greater than 0°C and lower than the air temperature during the next operation of the refrigerator.

4. The condensation temperature control method according to claim 3, characterized in that: Adjust the relationship between temperature and condenser length based on historical wall temperature and historical air temperature, including any of the following: If the historical wall temperature is higher than or equal to the historical air temperature, then the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old corresponding relationship is adjusted, and a new corresponding relationship between the temperature and the condenser tube length is obtained, so that the condenser tube length corresponding to the same temperature in the new corresponding relationship is greater than the condenser tube length corresponding to the old corresponding relationship; If the historical wall temperature is lower than or equal to zero degrees, the temperature, or the condenser tube length, or the temperature and the condenser tube length in the old corresponding relationship is adjusted, and a new corresponding relationship between the temperature and the condenser tube length is obtained, so that the condenser tube length corresponding to the same temperature in the new corresponding relationship is smaller than the condenser tube length corresponding to the old corresponding relationship; If the historical wall temperature is greater than 0°C and less than the historical air temperature, the corresponding relationship between the temperature and the condenser tube length remains unchanged; The old corresponding relationship is the corresponding relationship between the temperature and the length of the condenser tube before adjustment.

5. The condensation temperature control method according to claim 4, characterized in that: The historical wall temperature is higher than or equal to the historical air temperature, specifically: the historical wall temperature is higher than or equal to the maximum value of the preset wall temperature range; The historical wall temperature is greater than 0°C and less than the historical air temperature, specifically: the historical wall temperature is greater than 0°C and less than the maximum value of the preset wall temperature range; Among them, the minimum value of the preset wall temperature range is 0°C, the maximum value of the preset wall temperature range is less than the historical air temperature, and the higher the historical air temperature, the greater the temperature difference between the historical air temperature and the maximum value of the preset wall temperature range.

6. The condensation temperature control method according to claim 4, characterized in that: The corresponding relationship between the temperature and the length of the condenser is a one-to-one corresponding relationship between the temperature variation sequence and the condenser length variation sequence; Adjust the corresponding relationship between temperature and condenser length, including: The temperature variation sequence and the condenser variation sequence in the corresponding relationship between the temperature and the condenser length are relatively misaligned, so that the temperature corresponding to each condenser length in the condenser length variation sequence is increased or decreased.

7. The condensation temperature control method according to any one of claims 1 to 6, characterized in that: The evaporator and the compressor in the refrigerator refrigeration system are provided with conventional refrigerant pipelines, and the conventional refrigerant pipelines are connected to the inlets of multiple condensing pipes through switching valves; Before obtaining the current air temperature in the return air duct, the condensing temperature control method further includes: When air is supplied to the room, the switching valve is controlled to connect the condenser pipe so that the refrigerant in the evaporator can return to the compressor through the condenser pipe; When there is no air supply in the room, the control switching valve connects the conventional refrigerant pipeline and blocks the condenser pipe, so that the refrigerant returns directly from the evaporator to the compressor.

8. A condensation temperature control device for a refrigerator return air duct, characterized in that: A return air path is provided between the compartment and the space where the evaporator is located. A plurality of parallel condensing tubes are provided between the evaporator and the compressor in the refrigerator refrigeration system. Each condensing tube is provided in the return air path for cooling the return air path. The condensing temperature control device comprises: An acquisition module, used to obtain the current temperature of the evaporator surface; A determination module determines the current condenser tube length corresponding to the current temperature according to the corresponding relationship between the temperature and the condenser tube length; The execution module is used to determine and connect a condenser tube of corresponding length among multiple condensers according to the current length of the condenser tube.

9. A condensing temperature control device for a return air duct of a refrigerator, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the condensation temperature control method of the return air duct of the refrigerator as described in any one of claims 1 to 7 when executing the program instructions.

10. A refrigerator, characterized in that: include: Refrigerator body; A return air duct is arranged between the compartment and the space where the evaporator is located. A plurality of parallel condensing tubes are arranged between the evaporator and the compressor in the refrigerator refrigeration system. Each condensing tube is arranged in the return air duct to cool the return air duct. The condensing temperature control device for the return air duct of the refrigerator as described in claim 8 or 9 is installed on the refrigerator body.

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