Refrigerator and defrosting control method thereof

Abstract

The invention discloses a refrigerator and a defrosting control method thereof, and the refrigerator comprises a refrigeration system, a refrigeration air duct, a defrosting control system, a defrosting control system and a defrosting control system, and is characterized in that the refrigeration air duct is used for transmitting cooling capacity of an evaporator arranged in the refrigeration air duct to a storage chamber; a defrosting air outlet door and a defrosting air return door are further arranged at different positions of the refrigeration air duct; the condenser air cavity communicates with the refrigeration air duct through a defrosting air outlet door and a defrosting air return door; the condensation fan is arranged in the condenser air cavity and used for sucking air in the refrigeration air duct through the defrosting air return air door and sending out the air through the defrosting air outlet air door after the air passes through the condenser, and a closed air curtain is formed in the refrigeration air duct; after the controller receives the defrosting instruction, the refrigerating system is controlled to operate in a countercurrent mode; and a defrosting air outlet door and a defrosting air return door are opened, and the condensation fan is controlled to operate at the preset rotating speed. According to the scheme, the problems that the heating and defrosting efficiency is low and the temperature in the storage chamber rises due to the fact that heat is lost into the storage chamber during defrosting can be avoided.

Description

Technical Field

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

[0002] When a refrigerator is refrigerating, the temperature of the evaporator surface is much lower than the dew point of the air in the storage compartment, resulting in condensation and frosting on the evaporator surface. When the frost layer on the evaporator surface reaches a certain thickness, it is necessary to defrost the evaporator to avoid affecting the refrigeration effect.

[0003] Currently, the refrigerator industry is researching the use of system condensation heat for defrosting. One method is to swap the functions of the evaporator and condenser in the original system to achieve system countercurrent defrosting. This defrosting scheme defrosts the evaporator from the inside out, with high heat utilization efficiency. However, since the inlet and outlet air vents of the air duct body are always connected to the evaporator chamber and the storage compartment, there will always be heat escaping from the evaporator chamber to the storage compartment during defrosting, which will cause the temperature of the storage compartment to rise and is not conducive to the fresh storage of food. Summary of the Invention

[0004] The purpose of the embodiments of the present invention is to provide a refrigerator and a defrosting control method thereof, which can avoid the problem that heat is lost to the storage compartment during defrosting, resulting in low heating defrosting efficiency and an increase in the temperature of the storage compartment.

[0005] To achieve the above purpose, the embodiments of the present invention provide a refrigerator, including:

[0006] A box body, in which at least one storage compartment is formed;

[0007] A refrigeration system, which consists of a refrigeration cycle pipeline formed by sequentially connecting a compressor, a condenser, a capillary tube, and an evaporator;

[0008] A refrigeration air duct, which is connected to the storage compartment through an air outlet communicating with the storage compartment, and is used to transfer the cold air of the evaporator arranged inside it to the storage compartment;

[0009] Defrosting air outlet dampers and defrosting air return dampers are also arranged at different positions of the refrigeration air duct;

[0010] A condenser air cavity, which is connected to the refrigeration air duct through the defrosting air outlet damper and the defrosting air return damper respectively;

[0011] A condensation fan, which is arranged in the condenser air cavity and is used to suck the air in the refrigeration air duct from the defrosting air return damper, send it out from the defrosting air outlet damper after passing through the condenser, and form a closed air curtain in the refrigeration air duct;

[0012] A controller, which is configured to:

[0013] After receiving the defrosting instruction, control the refrigeration system to operate in reverse flow;

[0014] Open the defrosting air outlet damper and the defrosting air return damper, and control the condensing fan to operate at a preset speed.

[0015] Preferably, a condensing air outlet damper and a condensing air inlet damper for guiding to the outside of the box body are further arranged in the condenser air cavity;

[0016] The controller is further configured to:

[0017] After receiving the refrigeration instruction, control the refrigeration system to operate in forward flow;

[0018] Close the defrosting air outlet damper and the defrosting air return damper, and open the condensing air outlet damper and the condensing air inlet damper.

[0019] As a preferred solution, the refrigerator further includes:

[0020] A first temperature sensor, which is arranged in the condenser air cavity and is used to detect the air cavity temperature of the condenser air cavity;

[0021] The controller is further configured to:

[0022] After controlling the refrigeration system to operate in reverse flow, obtain the air cavity temperature;

[0023] When the air cavity temperature is not higher than a preset threshold temperature, open the defrosting air outlet damper and the defrosting air return damper.

[0024] Preferably, the controller is further configured to:

[0025] After controlling the refrigeration system to operate in reverse flow, calculate the operation duration of the reverse flow operation;

[0026] When the operation duration is not less than a preset threshold duration, open the defrosting air outlet damper and the defrosting air return damper.

[0027] Preferably, the refrigerator further includes:

[0028] A second temperature sensor, which is arranged on the pipeline of the evaporator and is used to detect the pipeline temperature;

[0029] After receiving the refrigeration instruction, control the refrigeration system to operate in forward flow and obtain the pipeline temperature;

[0030] When the pipeline temperature is not greater than a preset refrigeration temperature, close the defrosting air outlet damper and the defrosting air return damper, and open the condensing air outlet damper and the condensing air inlet damper.

[0031] As a preferred solution, the refrigerator further includes:

[0032] A refrigeration fan, which is arranged in the refrigeration air duct and is used to accelerate the transfer of cold from the evaporator to the storage compartment;

[0033] The controller is further configured to:

[0034] After receiving a defrosting instruction, turn off the refrigeration fan;

[0035] After receiving a refrigeration instruction, start the refrigeration fan.

[0036] Preferably, the defrosting return air damper is arranged at a position between the evaporator and the air outlet;

[0037] The defrosting outlet air damper is arranged at a position between the defrosting return air damper and the air outlet.

[0038] Preferably, an air circulation guide plate is arranged in the refrigeration air duct and is used to guide the formation of circulating air between the defrosting outlet air damper and the defrosting return air damper.

[0039] An embodiment of the present invention further provides a refrigerator defrosting control method, and the refrigerator includes:

[0040] A box body, in which at least one storage compartment is formed;

[0041] A refrigeration system, which is composed of a refrigeration cycle pipeline formed by sequentially connecting a compressor, a condenser, a capillary tube and an evaporator;

[0042] A refrigeration air duct, which is communicated with the storage compartment through an air outlet communicated with the storage compartment, and is used to transfer the cold of the evaporator arranged inside it to the storage compartment;

[0043] Defrosting outlet air dampers and defrosting return air dampers are further arranged at different positions of the refrigeration air duct;

[0044] A condenser air cavity, which is communicated with the refrigeration air duct through the defrosting outlet air damper and the defrosting return air damper respectively;

[0045] A condenser fan, which is arranged in the condenser air cavity and is used to suck the air in the refrigeration air duct from the defrosting return air damper, and send it out from the defrosting outlet air damper after passing through the condenser, so as to form a closed air curtain in the refrigeration air duct;

[0046] A controller;

[0047] The method includes:

[0048] After receiving a defrosting instruction, control the refrigeration system to operate in reverse;

[0049] Open the defrost air outlet damper and the defrost air return damper, and control the condensing fan to operate at a preset speed.

[0050] Preferably, a condensing air outlet damper and a condensing air inlet damper for guiding to the outside of the cabinet are further arranged in the condenser air chamber;

[0051] The method further includes:

[0052] After receiving a refrigeration instruction, control the refrigeration system to operate in a forward flow;

[0053] Close the defrost air outlet damper and the defrost air return damper, and open the condensing air outlet damper and the condensing air inlet damper.

[0054] Compared with the prior art, for the refrigerator and its defrost control method disclosed in the present invention, the refrigerator includes a cabinet in which at least one storage chamber is formed; a refrigeration system composed of a refrigeration cycle pipeline sequentially connected by a compressor, a condenser, a capillary tube, and an evaporator; a refrigeration air duct that communicates with the storage chamber through an air outlet communicating with the storage chamber and is used to transfer the cold quantity of the evaporator arranged inside it to the storage chamber; a defrost air outlet damper and a defrost air return damper are further arranged at different positions of the refrigeration air duct; a condenser air chamber that communicates with the refrigeration air duct through the defrost air outlet damper and the defrost air return damper respectively; a condensing fan that is arranged in the condenser air chamber and is used to suck the air in the refrigeration air duct from the defrost air return damper, and send it out from the defrost air outlet damper after passing through the condenser, so as to form a closed air curtain in the refrigeration air duct; a controller configured to: after receiving a defrost instruction, control the refrigeration system to operate in a reverse flow; open the defrost air outlet damper and the defrost air return damper, and control the condensing fan to operate at a preset speed. The solution of the present application can avoid the problem that heat is lost to the storage chamber during defrosting, resulting in low heating defrost efficiency and an increase in the temperature inside the storage chamber. Description of the Drawings

[0055] Figure 1 is a schematic external structure diagram of a refrigerator provided by an embodiment of the present invention;

[0056] Figure 2 is a schematic internal structure diagram of a refrigerator provided by an embodiment of the present invention;

[0057] Figure 3 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0058] Figure 4 is a schematic structural diagram of a refrigerator provided by an embodiment of the present invention;

[0059] Figure 5It is a schematic structural diagram of the condenser air chamber provided by an embodiment of the present invention;

[0060] Figure 6 It is another schematic structural diagram of the refrigerator provided by an embodiment of the present invention;

[0061] Figure 7 It is yet another schematic structural diagram of the refrigerator provided by an embodiment of the present invention;

[0062] Figure 8 It is a schematic flowchart of the work executed by the controller provided by an embodiment of the present invention;

[0063] Figure 9 It is a schematic structural diagram of the refrigeration air duct provided by an embodiment of the present invention;

[0064] Figure 10 It is a schematic flowchart of the refrigerator defrosting control method provided by an embodiment of the present invention. Detailed implementation manners

[0065] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0066] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application 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 thus should not be construed as a limitation to the present application.

[0067] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0068] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "install", "connect", and "couple" 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0069] See Figure 1 , Figure 1 which is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention. The refrigerator in this embodiment has an approximate cuboid shape. The refrigerator includes a box body that defines a storage space and a plurality of door bodies provided at the opening of the box body. Among them, the door body includes a door body outer shell located outside the box body, a door body inner liner located inside the box body, an upper end cover, a lower end cover, and a heat insulation layer located between the door body outer shell, the door body inner liner, the upper end cover, and the lower end cover; generally, the heat insulation layer is filled with foaming material. The box body is provided with a chamber, and the chamber includes a component storage chamber for placing components in the refrigerator, such as a compressor compartment, etc., and also includes a storage space for storing food, etc.

[0070] See Figure 2 , Figure 2 which is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention. The storage space can be divided into a plurality of storage chambers. According to different uses, the storage chambers can be configured as a refrigerating chamber and a freezing chamber, and can also include a variable temperature chamber, a vacuum drawer, a humidity-preserving drawer, and so on. Each storage chamber corresponds to one or more door bodies, and the storage chambers in the upper part of the refrigerator are provided with double-door bodies. Among them, the door bodies can be pivotally arranged at the opening of the box body, or can be opened in a drawer manner to realize drawer-type storage. A display screen is provided at the door of the refrigerator, and the display screen is used to display prompt information and receive the touch operation of the user.

[0071] See Figure 3 , Figure 3The schematic diagram of the structure of the refrigeration system in the refrigerator provided by the embodiment of the present invention, the refrigeration system includes a compressor 1, an evaporator 2, a drying filter (not shown in the figure), a capillary tube 3, a condenser 4 and a gas-liquid separator (not shown in the figure). The working process of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process. The compression process is: plug in the power cord of the refrigerator, when the contacts of the thermostat are connected, the compressor 1 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor 1, and is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 1 and then discharged into the condenser 4; the condensation process is: the high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 4, the temperature continues to drop, and is gradually cooled to a saturated vapor of normal temperature and high pressure, and is further cooled to a saturated liquid, and the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process; the throttling process is as follows ... The process is as follows: the condensed refrigerant saturated liquid is filtered through a drying filter to remove moisture and impurities and then flows into the capillary 3, through which it is throttled and depressurized, and the refrigerant becomes wet steam at room temperature and low pressure; the evaporation process is as follows: the wet steam at room temperature and low pressure begins to absorb heat and vaporize in the evaporator 2, which not only reduces the temperature of the evaporator 2 and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 2 passes through the gas-liquid separator and returns to the compressor 1 again, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0072] The refrigerator provided by the embodiment of the present invention comprises:

[0073] a box body, in which at least one storage chamber is formed;

[0074] The refrigeration system consists of a refrigeration cycle pipeline composed of a compressor, a condenser, a capillary tube and an evaporator connected in sequence;

[0075] a refrigeration air duct, which is in communication with the storage chamber via an air outlet in communication with the storage chamber, and is used for transmitting the cold energy of the evaporator disposed therein to the storage chamber;

[0076] The refrigeration air duct is also provided with defrost air outlet doors and defrost air return doors at different positions;

[0077] A condenser air chamber, which is connected to the refrigeration air duct through the defrost air outlet damper and the defrost air return damper respectively;

[0078] A condensing fan, which is arranged in the condenser air cavity, is used to suck the air of the refrigeration air duct through the defrost return air damper, and send the air out through the defrost outlet air damper after passing through the condenser, so as to form a closed air curtain in the refrigeration air duct;

[0079] A controller configured to:

[0080] After receiving the defrosting instruction, control the refrigeration system to operate in reverse flow;

[0081] Open the defrost air outlet damper and the defrost air return damper, and control the condensing fan to operate at a preset speed.

[0082] In the specific implementation of this embodiment, the refrigerator is provided with a refrigeration air duct, and the refrigeration air duct is connected to the storage compartment through the set air outlet, so as to transport the cold generated by the evaporator arranged in the refrigeration air duct to the storage compartment to cool the storage compartment, and for the air circulation between the storage compartment and the refrigeration air duct in the refrigerator. The storage compartment also needs to be provided with a refrigeration air return port, which is used to return the air in the storage compartment to the air duct through the air return port arranged in the refrigeration air duct, and then cool it again through the evaporator to form a refrigeration air circulation, and continuously cool the inside of the storage compartment.

[0083] To realize the defrosting of the evaporator, the refrigeration cycle pipeline of the refrigeration system provided in this application supports the reverse flow defrosting design. When the refrigeration cycle pipeline operates in the forward flow, at this time, the refrigerant is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor and then discharged into the condenser, where it is cooled into a normal-temperature and high-pressure saturated vapor, and further cooled into a saturated liquid. The condensed refrigerant saturated liquid flows into the capillary tube for throttling and pressure reduction, and the refrigerant becomes a normal-temperature and low-pressure wet vapor; the normal-temperature and low-pressure wet vapor starts to absorb heat and vaporize in the evaporator, not only reducing the temperature of the evaporator and its surrounding areas, but also turning the refrigerant into a low-temperature and low-pressure gas. The refrigerant coming out of the evaporator returns to the compressor again after passing through the gas-liquid separator, thus realizing the refrigeration of the refrigerator. When the refrigeration cycle pipeline operates in reverse flow, the refrigerant is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor and then discharged to the evaporator for heat dissipation, where it is cooled into a normal-temperature and high-pressure saturated vapor, flows into the capillary tube for throttling and pressure reduction, and the refrigerant becomes a normal-temperature and low-pressure wet vapor; the normal-temperature and low-pressure wet vapor starts to absorb heat and vaporize in the condenser, and the refrigerant coming out of the condenser returns to the compressor again after passing through the gas-liquid separator. At this time, the original evaporator becomes a high-temperature heat dissipation component and defrosts from the inside out, and the original condenser becomes a low-temperature component for heat absorption and refrigeration.

[0084] When refrigerating in a countercurrent manner through a refrigeration system, the evaporator is a high-temperature heat dissipation component, and the heat dissipated can defrost the frost on the evaporator. However, at this time, since the evaporator is directly connected to the storage compartment through the refrigeration air duct, heat will be lost to the storage compartment, affecting the normal food preservation in the refrigerator. Although existing means on the market usually design a movable cover plate at the air outlet of the fan in the refrigeration air duct of the freezing compartment and the evaporator chamber. When the evaporator needs to be defrosted, a sealed space is formed in the evaporator chamber by rotating or moving the movable baffle, but the effect of preventing temperature rise is strongly related to the design of the movable gap, and this solution has a complex structure, and it is more likely to have problems such as incomplete defrosting and residual ice growth jamming moving parts in a conventional refrigerator.

[0085] In view of this defect in the prior art, the present application proposes a refrigerator. Refer to Figure 4 , which is a schematic structural diagram of the refrigerator provided by the embodiment of the present invention.

[0086] A defrost air outlet damper and a defrost air return damper are provided at different positions of the refrigeration air duct.

[0087] The refrigeration air duct is respectively connected to the condenser air chamber of the condenser through the defrost air outlet damper and the defrost air return damper.

[0088] And a condensation fan is designed in the condenser air chamber of the condenser. By accelerating the air flow in the condenser air chamber through the condensation fan, the air in the refrigeration air duct is sucked in through the defrost air return damper, and after passing through the condenser, it is sent out through the defrost air outlet damper. Through the action of the condensation air speed, the air flow between the defrost air outlet damper and the defrost air return damper in the refrigeration air duct is accelerated, and a sealed air curtain is formed in the refrigeration air duct to seal the refrigeration air duct from the evaporator to the storage compartment, avoiding the loss of heat dissipated by the evaporator into the storage compartment.

[0089] The refrigerator provided by the present invention completes the defrost control process through a controller. Specifically, the controller is connected to the condensation fan, the defrost air outlet damper, the defrost air return damper, and the refrigeration system to complete the defrost control process. When defrosting, the following steps are specifically executed:

[0090] Specifically, after starting the defrost mode, that is, when receiving a defrost instruction, the defrost mode is started.

[0091] It should be noted that the defrost instruction can be actively triggered by the user by pressing a set button to generate a defrost control instruction, or the refrigerator can actively detect the operating condition of the refrigerator. When it detects that the state data of the refrigerator meets the preset defrost condition, it passively triggers the defrost instruction to trigger the refrigerator to defrost.

[0092] After starting the defrosting mode, control the refrigeration system to operate in reverse. At this time, the high-temperature exhaust gas of the compressor enters the evaporator for heat dissipation. After coming out of the evaporator, it enters the condenser to absorb heat after throttling and reducing pressure through the capillary tube, and finally returns to the compressor to complete the entire refrigeration cycle. At this time, the original evaporator becomes a high-temperature heat dissipation component and defrosts from the inside out, while the original condenser becomes a low-temperature component to absorb heat and refrigerate.

[0093] At this time, it is necessary to open the defrost air outlet damper and the defrost air return damper to connect the condenser air chamber and the refrigeration air duct, and the condenser fan operates at a preset speed. By accelerating the air flow rate in the condenser air chamber through the condenser fan, the air flow rate between the defrost air outlet damper and the defrost air return damper in the refrigeration air duct is further increased, forming an air circulation and a closed air curtain in the refrigeration air duct to prevent the heat of the evaporator from escaping to the storage room through the refrigeration air duct.

[0094] At this time, since the condenser becomes a low-temperature component to absorb heat and refrigerate, the air circulation formed between the condenser air chamber and the defrost air outlet damper and the defrost air return damper in the refrigeration air duct is a low-temperature air circulation, which has a strong isolation effect on the heat dissipated by the evaporator and can prevent the spread of the heat dissipated by the evaporator. Although a small amount of cold energy will be lost in this air circulation, whether the cold energy is lost to the storage room or to the evaporator chamber, it will not affect the normal function of the storage room and the defrosting of the evaporator.

[0095] Although the defrost air outlet damper and the defrost air return damper of the present application are also designed in the refrigeration air duct, they are connected to the condenser air chamber. When the refrigerator is refrigerating normally, since the condenser is a high-temperature heat dissipation component, the heat dissipated in the condenser air chamber can keep the defrost air outlet damper and the defrost air return damper from frosting, and prevent the hidden danger of the moving parts being stuck due to the growth of residual ice caused by the low temperature of the refrigeration air duct.

[0096] The solution of the present application can solve the problem of the temperature rise in the storage room during defrosting of the refrigerator. By using the cold air circulation air curtain formed in the freezing air duct, the heat of the evaporator can be prevented from escaping to the storage room, and the heat dissipation efficiency of the condenser can also be improved.

[0097] In another embodiment provided by the present invention, a condensation air outlet damper and a condensation air inlet damper leading to the outside of the box body are further provided in the condenser air chamber;

[0098] The controller is further configured to:

[0099] After receiving the refrigeration instruction, control the refrigeration system to operate in the forward flow;

[0100] Close the defrost air outlet damper and the defrost air return damper, and open the condensation air outlet damper and the condensation air inlet damper.

[0101] During the specific implementation of this embodiment, refer toFigure 5 This is a schematic structural diagram of the condenser air chamber provided by an embodiment of the present invention. The condenser air chamber is further provided with a condensate outlet air damper and a condensate inlet air damper. The condenser air chamber is communicated with the outside of the refrigerator housing through the condensate outlet air damper and the condensate inlet air damper. During normal refrigeration, air circulation is formed through the condensate outlet air damper and the condensate inlet air damper to communicate with the outside air of the housing, taking away the heat generated by the condenser.

[0102] When the present application is specifically implemented, the process of the controller executing refrigeration control specifically includes:

[0103] Specifically, after starting the refrigeration mode, that is, when receiving a refrigeration instruction, the refrigeration mode is started.

[0104] It should be noted that the refrigeration instruction can be actively triggered and generated by the user by pressing a set key, or the refrigerator can actively detect the operating condition of the refrigerator. When the detected state data of the refrigerator meets the preset refrigeration conditions, the refrigeration instruction is passively triggered and generated to trigger the refrigerator to defrost.

[0105] After starting the refrigeration mode, control the refrigeration system to operate in a forward flow. At this time, the high-temperature exhaust gas of the compressor enters the condenser for heat dissipation, and after coming out of the condenser, it enters the evaporator to absorb heat after throttling and reducing pressure through a capillary tube, and finally returns to the compressor to complete the entire refrigeration cycle. At this time, the condenser is a high-temperature heat dissipation component, and the evaporator becomes a low-temperature component to absorb heat and refrigerate.

[0106] See Figure 6 This is another schematic structural diagram of the refrigerator provided by an embodiment of the present invention. When the refrigerator is operating normally, the refrigerator needs to transfer the cold generated by the evaporator to the storage compartment through the refrigeration air duct. At this time, the defrost outlet air damper and the defrost return air damper need to be closed to isolate the condenser air chamber and the refrigeration air duct. The cold air output from the refrigeration air duct continues to operate normally through the condensate fan. By accelerating the air flow rate in the condenser air chamber through the condensate fan, the condenser air chamber is communicated with the outside of the refrigerator housing through the condensate outlet air damper and the condensate inlet air damper to form an air circulation. The air inhaled from the condensate inlet air damper passes through the condenser to take away the heat of the condenser, and then the air is discharged from the condensate outlet air damper.

[0107] The refrigerator is configured with a condensate outlet air damper, a condensate inlet air damper, a defrost outlet air damper, and a defrost return air damper. Air circulation is carried out through different dampers in different modes to ensure the normal operation of the refrigerator.

[0108] In another embodiment provided by the present invention, the refrigerator further includes:

[0109] A first temperature sensor, which is arranged in the condenser air chamber and is used to detect the air chamber temperature of the condenser air chamber;

[0110] The controller is further configured to:

[0111] After controlling the reverse operation of the refrigeration system, obtain the temperature of the air chamber.

[0112] When the temperature of the air chamber is not higher than the preset threshold temperature, open the defrost air outlet damper and the defrost air return damper.

[0113] In the specific implementation of this embodiment, refer to Figure 7 , which is another structural schematic diagram of the refrigerator provided by the embodiment of the present invention. A first temperature sensor is arranged in the condenser air chamber, and it is used to detect the air chamber temperature of the condenser air chamber.

[0114] Refer to Figure 8 , which is a schematic flow chart of the work executed by the controller provided by the embodiment of the present invention; when the controller performs defrost control, the following steps are executed:

[0115] Step S801, determine whether a defrost instruction is received;

[0116] If not, return to step S801;

[0117] If so, execute step S802;

[0118] Step S802, control the refrigeration system to operate in reverse;

[0119] Step S803, obtain the air chamber temperature T. That is, detect the air chamber temperature of the condenser air chamber through the first temperature sensor arranged in the condenser air chamber.

[0120] Step S804, determine whether the air chamber temperature T≤T th holds.

[0121] If not, return to step S803;

[0122] If so, execute step S805;

[0123] Step S805, open the defrost air outlet damper and the defrost air return damper. At this time, close the condensation air inlet damper and the condensation air outlet damper, open the defrost air outlet damper and the defrost air return damper, and control the condensation fan to operate at a preset speed.

[0124] By monitoring the temperature of the condenser air chamber, when the temperature of the condenser air chamber drops to a certain extent, at this time, the condenser absorbs heat to generate a certain amount of cold, and the evaporator also generates a certain amount of heat through heat dissipation. Then open the defrost air outlet damper and the defrost air return damper to form an air curtain through circulation, ensuring that the closed air curtain is at a lower temperature and achieving a better isolation effect.

[0125] In another embodiment provided by the present invention, the controller is further configured to:

[0126] After controlling the reverse operation of the refrigeration system, calculate the operation duration of the reverse operation;

[0127] When the operation duration is not less than a preset threshold duration, open the defrost air outlet damper and the defrost air return damper.

[0128] In the specific implementation of this embodiment, as a parallel implementation of the previous embodiment, when the refrigerator is in the defrost mode, in addition to directly monitoring the temperature, the reverse operation duration can also be monitored to ensure that the sealed air curtain is at a lower temperature and achieve a better isolation effect.

[0129] When the controller performs defrost control, the following steps are executed:

[0130] After receiving the defrost command, control the refrigeration system to operate in reverse;

[0131] Calculate the operation duration t of the reverse operation.

[0132] Judge whether the operation duration t≥t th is established.

[0133] If not, continue to calculate the operation duration t of the reverse operation;

[0134] If so, open the defrost air outlet damper and the defrost air return damper. At this time, close the condensing air inlet damper and the condensing air outlet damper, open the defrost air outlet damper and the defrost air return damper, and control the condensing fan to operate at a preset speed.

[0135] By monitoring the operation duration of the reverse operation of the refrigeration system, after the reverse operation for a certain duration and when the temperature of the condenser air cavity drops to a certain extent, at this time, the condenser absorbs heat to generate a certain amount of cold, and the evaporator also generates a certain amount of heat through heat dissipation. Then open the defrost air outlet damper and the defrost air return damper to form an air curtain through circulation, ensure that the sealed air curtain is at a lower temperature, and achieve a better isolation effect.

[0136] In another embodiment provided by the present invention, the refrigerator further includes:

[0137] A second temperature sensor is arranged on the pipeline of the evaporator for detecting the pipeline temperature;

[0138] After receiving the refrigeration command, control the refrigeration system to operate in the forward direction and obtain the pipeline temperature;

[0139] When the pipeline temperature is not greater than the preset refrigeration temperature, close the defrost air outlet damper and the defrost air return damper, and open the condensing air outlet damper and the condensing air inlet damper.

[0140] In the specific implementation of this embodiment, refer to Figure 7, a second temperature sensor is provided on the pipeline of the evaporator to monitor the pipeline temperature of the evaporator pipeline. When the controller enters the refrigeration mode, the following steps are specifically executed:

[0141] After receiving the refrigeration instruction, start the refrigeration mode;

[0142] Control the refrigeration system to operate in a forward flow. At this time, the evaporator refrigerates normally and generates cold.

[0143] Obtain the pipeline temperature T1 of the evaporator pipeline. That is, obtain the pipeline temperature T1 of the evaporator pipeline through the temperature sensor provided on the evaporator;

[0144] Judge whether the pipeline temperature T1 ≤ T th2 is established, that is, judge whether the pipeline temperature T1 is not greater than the preset refrigeration temperature T th2 .

[0145] If not, that is, when the pipeline temperature T1 of the evaporator is higher than the evaporator refrigeration temperature T th2 , maintain the current state and continue refrigerating to make the temperature of the evaporator continue to decrease.

[0146] If so, close the defrost air outlet damper and the return air damper, and open the condensation air outlet damper and the condensation air inlet damper.

[0147] The current temperature of the evaporator is detected in real time through the temperature sensor, and the damper is controlled to open according to the pipeline temperature of the evaporator. Only when the temperature of the evaporator drops to the refrigeration temperature, the defrost air outlet damper and the return air damper are closed, and the condensation air outlet damper and the condensation air inlet damper are opened to cool the storage room, so as to avoid the temperature of the evaporator being relatively high at this time when the refrigeration is restored. After closing the defrost air outlet damper and the return air damper, the heat of the evaporator is dissipated into the storage room, affecting the normal refrigeration of the storage room.

[0148] In another embodiment provided by the present invention, the refrigerator further includes:

[0149] A refrigeration fan, which is arranged in the refrigeration air duct and is used to accelerate the transfer of cold from the evaporator to the storage room;

[0150] The controller is further configured to:

[0151] After receiving the defrost instruction, close the refrigeration fan;

[0152] After receiving the refrigeration instruction, start the refrigeration fan.

[0153] When specifically implementing this embodiment, refer to Figure 7 , a refrigeration fan is also arranged in the refrigeration air duct, and the refrigeration fan is used to accelerate the transfer of cold from the evaporator to the storage room.

[0154] In the defrost control and refrigeration mode control room, it is necessary to control the refrigeration fan to avoid the influence of the refrigeration fan on the defrost control.

[0155] When the refrigerator is operating in the refrigeration mode, the refrigeration fan is turned on, and the cold quantity of the evaporator is output to the storage compartment to cool the storage compartment.

[0156] After receiving the defrost instruction, it is necessary to switch to the defrost mode. At this time, it is necessary to isolate the air circulation between the refrigeration air duct and the storage compartment. Therefore, it is necessary to turn off the refrigeration fan to avoid the influence of the operation of the refrigeration fan on the airtight air curtain between the defrost air outlet damper and the defrost return air damper in the refrigeration air duct, resulting in a reduction in the air curtain isolation effect.

[0157] When the defrost mode is turned off and the refrigeration mode is re-entered, it is necessary to restart the refrigeration fan to accelerate the air circulation from the evaporator to the storage compartment and improve the refrigeration effect.

[0158] In another embodiment provided by the present invention, the defrost return air damper is arranged at a position between the evaporator and the air outlet;

[0159] The defrost air outlet damper is arranged at a position between the defrost return air damper and the air outlet;

[0160] An air circulation guide plate is arranged in the refrigeration air duct for guiding the formation of the circulating air between the defrost air outlet damper and the defrost return air damper.

[0161] When specifically implementing this embodiment, refer to Figure 9 , which is a schematic structural diagram of the refrigeration air duct provided by the embodiment of the present invention. The defrost return air damper arranged in the refrigeration air duct is arranged at a position between the evaporator and the air outlet; the defrost air outlet damper is arranged at a position between the defrost return air damper and the air outlet.

[0162] By designing like this, the defrost air outlet damper is designed at a position close to the air outlet of the refrigeration air duct, and the defrost return air damper is designed at a position close to the evaporator, so that the cold air circulation output from the condenser air cavity flows from the air outlet of the refrigeration air duct to the evaporator, which is opposite to the heat dissipation direction generated by the evaporator, and can avoid the heat of the evaporator from being dissipated to the storage compartment through the air outlet to the greatest extent, realizing a better air curtain isolation effect.

[0163] In another embodiment provided by the present invention, an air circulation guide plate is arranged in the refrigeration air duct for guiding the formation of the circulating air between the defrost air outlet damper and the defrost return air damper.

[0164] When specifically implementing this embodiment, refer to Figure 9, a wind circulation deflector is provided in the refrigeration air duct. A diversion air duct is formed in the refrigeration air duct through the wind circulation deflector. In the defrosting mode, a duct is formed between the defrosting air outlet damper and the defrosting air return damper, which can guide the air flow and facilitate the formation of the circulating air.

[0165] By cooperating with the refrigeration fan design, the wind circulation deflector can divert the refrigeration air duct during refrigeration. Through the aerodynamic design, it can reverse the air flow and accelerate the transmission of cold quantity to the storage compartment.

[0166] Another embodiment of the present invention provides a refrigerator defrosting control method. The refrigerator includes:

[0167] A box body, in which at least one storage compartment is formed;

[0168] A refrigeration system, which consists of a refrigeration cycle pipeline formed by sequentially connecting a compressor, a condenser, a capillary tube, and an evaporator;

[0169] A refrigeration air duct, which is communicated with the storage compartment through an air outlet communicated with the storage compartment, and is used to transmit the cold quantity of the evaporator arranged inside it to the storage compartment;

[0170] Defrosting air outlet dampers and defrosting air return dampers are also arranged at different positions of the refrigeration air duct;

[0171] A condenser air cavity, which is communicated with the refrigeration air duct through the defrosting air outlet damper and the defrosting air return damper respectively;

[0172] A condensation fan, which is arranged in the condenser air cavity, is used to suck the air in the refrigeration air duct from the defrosting air return damper, and send it out from the defrosting air outlet damper after passing through the condenser, so as to form a closed air curtain in the refrigeration air duct;

[0173] A controller;

[0174] See Figure 10 , which is a schematic flow chart of the refrigerator defrosting control method provided by the embodiment of the present invention; The method includes the following steps:

[0175] Step S1, after receiving the defrosting instruction, control the refrigeration system to operate in reverse;

[0176] Step S2, open the defrosting air outlet damper and the defrosting air return damper, and control the condensation fan to operate at a preset speed.

[0177] In another embodiment provided by the present invention, a condensation air outlet damper and a condensation air inlet damper leading to the outside of the box body are also arranged in the condenser air cavity;

[0178] The method further includes:

[0179] After receiving the refrigeration instruction, control the refrigeration system to operate in the forward flow direction;

[0180] Close the defrost air outlet damper and the defrost air return damper, and open the condensation air outlet damper and the condensation air inlet damper.

[0181] It should be noted that the refrigerator control method provided in the embodiment of the present invention is the same as all the process steps executed by the controller of a refrigerator in the above embodiment, and the working principles and beneficial effects of the two correspond one by one, so they will not be described in detail here.

[0182] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, the storage medium can be a magnetic disk, an optical disc, a read-only memory (ROM), or a random access memory (RAM), etc.

[0183] The above is the preferred implementation manner of the present invention. It should be pointed out that for those of ordinary skill in the art in the technical field of the present invention, without departing from the principle of the present invention, several improvements and retouches can still be made, and these improvements and retouches are also regarded as the protection scope of the present invention.

Claims

1. A refrigerator, characterized in that, Comprising: A box body in which at least one storage chamber is formed; A refrigeration system composed of a refrigeration cycle pipeline in which a compressor, a condenser, a capillary tube, and an evaporator are connected in sequence; A refrigeration air duct that communicates with the storage chamber through an air outlet communicating with the storage chamber and is used to transfer the cold quantity of the evaporator arranged therein to the storage chamber; A defrost air outlet damper and a defrost air return damper are also arranged at different positions of the refrigeration air duct; A condenser air cavity that communicates with the refrigeration air duct through the defrost air outlet damper and the defrost air return damper respectively; A condensation fan is arranged in the condenser air cavity and is used to suck the air in the refrigeration air duct from the defrost air return damper, send it out from the defrost air outlet damper after passing through the condenser, and form a closed air curtain in the refrigeration air duct; A controller configured to: After receiving a defrost instruction, control the refrigeration system to operate in reverse flow; Open the defrost air outlet damper and the defrost air return damper, and control the condensation fan to operate at a preset speed.

2. The refrigerator according to claim 1, wherein, A condensation air outlet damper and a condensation air inlet damper guiding to the outside of the box body are also arranged in the condenser air cavity; The controller is further configured to: After receiving a refrigeration instruction, control the refrigeration system to operate in forward flow; Close the defrost air outlet damper and the defrost air return damper, and open the condensation air outlet damper and the condensation air inlet damper.

3. The refrigerator according to claim 1, characterized in that, The refrigerator further includes: A first temperature sensor arranged in the condenser air cavity and used to detect the air cavity temperature of the condenser air cavity; The controller is further configured to: After controlling the refrigeration system to operate in reverse flow, obtain the air cavity temperature; When the air cavity temperature is not higher than a preset threshold temperature, open the defrost air outlet damper and the defrost air return damper.

4. The refrigerator according to claim 1, characterized in that, The controller is further configured to: After controlling the refrigeration system to operate in reverse flow, calculate the operation duration of the reverse flow operation; When the operation duration is not less than a preset threshold duration, open the defrost air outlet damper and the defrost air return damper.

5. The refrigerator according to claim 2, characterized in that, The refrigerator further includes: A second temperature sensor arranged on the pipeline of the evaporator and used to detect the pipeline temperature; After receiving a refrigeration instruction, control the refrigeration system to operate in forward flow and obtain the pipeline temperature; When the pipeline temperature is not greater than a preset refrigeration temperature, close the defrost air outlet damper and the defrost air return damper, and open the condensation air outlet damper and the condensation air inlet damper.

6. The refrigerator according to claim 1, characterized in that, The refrigerator further includes: A refrigeration fan arranged in the refrigeration air duct and used to accelerate the transfer of the cold quantity from the evaporator to the storage chamber; The controller is further configured to: After receiving a defrost instruction, turn off the refrigeration fan; After receiving a refrigeration instruction, start the refrigeration fan.

7. The refrigerator according to claim 1, characterized in that, The defrost air return damper is arranged at a position between the evaporator and the air outlet; The defrost air outlet damper is arranged at a position between the defrost air return damper and the air outlet.

8. The refrigerator according to claim 1, characterized in that, An air circulation guide plate is arranged in the refrigeration air duct and is used to guide the formation of the circulating air between the defrost air outlet damper and the defrost air return damper.

9. A defrost control method for a refrigerator, characterized in that, The refrigerator includes: A box body in which at least one storage chamber is formed; A refrigeration system, which consists of a refrigeration cycle pipeline formed by sequentially connecting a compressor, a condenser, a capillary tube, and an evaporator; A refrigeration air duct, which is communicated with the storage chamber through an air outlet communicated with the storage chamber, and is used for transmitting the cold quantity of the evaporator arranged inside it to the storage chamber; Defrost air outlet dampers and defrost return air dampers are also arranged at different positions of the refrigeration air duct; A condenser air cavity, which is communicated with the refrigeration air duct through the defrost air outlet damper and the defrost return air damper respectively; A condensation fan, which is arranged in the condenser air cavity, is used for sucking the air in the refrigeration air duct from the defrost return air damper, sending it out from the defrost air outlet damper after passing through the condenser, and forming a closed air curtain in the refrigeration air duct; A controller; The method includes: After receiving a defrost instruction, controlling the refrigeration system to operate in reverse; Opening the defrost air outlet damper and the defrost return air damper, and controlling the condensation fan to operate at a preset speed.

10. The refrigerator defrosting control method according to claim 9, characterized in that, A condensation air outlet damper and a condensation air inlet damper for guiding to the outside of the box body are also arranged in the condenser air cavity; The method further includes: After receiving a refrigeration instruction, controlling the refrigeration system to operate in the forward direction; Closing the defrost air outlet damper and the defrost return air damper, and opening the condensation air outlet damper and the condensation air inlet damper.

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