Refrigerator and defrosting control method thereof

Abstract

The invention discloses a refrigerator and a defrosting control method thereof. The refrigerator comprises an air duct, and the air duct is further provided with a defrosting air outlet; a refrigeration return air inlet is formed in the joint of the return air inlet of the air duct and the storage chamber; the air duct cover plate is provided with a cover plate air outlet corresponding to the air outlet of the air duct and a cover plate separation blade; the driving device is used for driving the air duct cover plate to be switched between the first position and the second position; when the air duct cover plate is located at the first position, the air outlet corresponds to the cover plate air outlet in position, and the air return opening communicates with the refrigeration air return opening. When the air duct cover plate is located at the second position, the air outlet and the cover plate air outlet are staggered in position, and the air return opening communicates with the defrosting air outlet; and when the defrosting mode is started, the heating wire is started, and the air duct cover plate is switched to the second position from the first position. 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 particularly to a refrigerator and a defrosting control method thereof. Background Art

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

[0003] In the prior art, the frost layer on the surface of the evaporator is usually removed by electric heating. Since the evaporator chamber is connected to the freezer through the air outlet of the freezing air duct, part of the heat generated during defrosting inevitably escapes into the storage chamber through the air duct, resulting in low defrosting efficiency by heating and easily causing the temperature in the storage chamber to rise. 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 into the storage chamber during defrosting, resulting in low defrosting efficiency by heating and causing the temperature in the storage chamber to rise.

[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 chamber is formed;

[0007] An air duct that is connected to the storage chamber through an air outlet and an air return port communicating with the storage chamber, and is used to realize the air circulation between the evaporator disposed therein and the storage chamber;

[0008] A heating wire disposed on the evaporator for heating the evaporator to defrost;

[0009] The air duct is further provided with a defrosting air outlet;

[0010] A refrigeration air return port is further provided at the connection between the air return port and the storage chamber;

[0011] An air duct cover plate, on which there are cover plate air outlets corresponding to the number and positions of the air outlets, and a cover plate baffle for controlling the connection between the air return port and the defrosting air outlet / the refrigeration air return port;

[0012] A driving device for driving the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlet corresponds to the cover plate air outlet in position, and the air return port is connected to the refrigeration air return port; when the air duct cover plate is in the second position, the air outlet and the cover plate air outlet are staggered in position, and the air return port is connected to the defrosting air outlet;

[0013] A controller configured to:

[0014] When starting the defrosting mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position.

[0015] Preferably, the controller is further configured to:

[0016] When starting the refrigeration mode, turn off the heating wire and switch the air duct cover plate from the second position to the first position.

[0017] As a preferred solution, the refrigerator further includes:

[0018] A blower disposed in the air duct for controlling the gas flow direction and gas flow rate in the air duct;

[0019] A temperature sensor for detecting the current temperature of the evaporator pipeline;

[0020] The heating wire is arranged at the bottom of the evaporator;

[0021] The controller is further configured to:

[0022] When starting the defrosting mode, obtain the current temperature;

[0023] When the current temperature is not greater than a preset defrosting temperature, control the gas flow direction to be from bottom to top through the evaporator by controlling the rotation direction of the blower;

[0024] When the current temperature is greater than the defrosting temperature, control the gas flow direction to be from top to bottom through the evaporator by controlling the rotation direction of the blower.

[0025] Preferably, the controller is further configured to:

[0026] When starting the refrigeration mode, turn off the heating wire and detect the current temperature of the evaporator pipeline through the provided temperature sensor;

[0027] When the current temperature is less than a preset refrigeration temperature, switch the air duct cover plate from the second position to the first position.

[0028] Preferably, the controller is further configured to:

[0029] When starting the defrosting mode, turn off the evaporator;

[0030] When starting the refrigeration mode, start the evaporator.

[0031] As a preferred solution, the driving device specifically includes:

[0032] A nut is provided on the air duct cover plate, and the air duct cover plate is restricted to slide only between a first position and a second position;

[0033] A screw rod is engaged with the nut;

[0034] A driving motor is used to drive the screw rod to rotate forward or backward, driving the nut to move relative to the screw rod to control the air duct cover plate to move between the first position and the second position.

[0035] Preferably, the air outlet is arranged on the back of the air duct foam board of the air duct;

[0036] The air duct cover plate is arranged closely against the back of the air duct foam board;

[0037] The middle of the air duct foam board is hollowed out to form an air duct chamber, and its front is connected to the air duct;

[0038] The defrosting air outlet is arranged at the bottom of the air duct foam board.

[0039] Further, a cover plate baffle arranged at the bottom of the air duct cover plate is perpendicular to it;

[0040] The driving device drives the air duct cover plate to slide up and down. When the air duct cover plate is in the first position, the cover plate baffle covers the defrosting air outlet, and the air return openings and the refrigeration air return openings respectively arranged on the left and right sides of the air duct cover plate are communicated through the channel formed by the cover plate baffle and the bottom of the air duct;

[0041] When the air duct cover plate is in the second position, the cover plate baffle contacts the bottom of the air duct, the air return openings and the refrigeration air return openings are isolated by the air duct cover plate, and the air return openings and the defrosting air outlet are communicated.

[0042] As an improvement of the above solution, a sealing strip is arranged at the bottom of the cover plate baffle.

[0043] An embodiment of the present invention also provides a refrigerator defrosting control method, and the refrigerator includes:

[0044] A box body, in which at least one storage chamber is formed;

[0045] An air duct, which is communicated with the storage chamber through an air outlet and an air return opening communicated with the storage chamber, and is used to realize the air circulation between the evaporator arranged inside it and the storage chamber;

[0046] A heating wire is arranged on the evaporator and is used to heat the evaporator for defrosting;

[0047] The air duct is also provided with a defrosting air outlet;

[0048] A refrigeration air return opening is also provided at the connection between the air return opening and the storage chamber;

[0049] An air duct cover plate, on which there are cover plate air outlet openings corresponding to the number and positions of the air outlet openings, and a cover plate baffle for controlling the communication between the air return opening and the defrosting air outlet opening / the refrigeration air return opening;

[0050] A driving device for driving the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlet opening corresponds to the cover plate air outlet opening in position, and the cover plate baffle controls the communication between the air return opening and the refrigeration air return opening;

[0051] When the air duct cover plate is in the second position, the air outlet opening and the cover plate air outlet opening are staggered in position, and the cover plate baffle controls the communication between the air return opening and the defrosting air outlet opening;

[0052] A controller;

[0053] The method includes:

[0054] When starting the defrosting mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position.

[0055] Compared with the prior art, for the refrigerator and its defrosting control method disclosed in the present invention, the refrigerator includes a box body, in which at least one storage chamber is formed; an air duct, which is communicated with the storage chamber through an air outlet opening and an air return opening communicated with the storage chamber, and is used to realize the air circulation between an evaporator arranged inside it and the storage chamber; a heating wire arranged on the evaporator for heating the evaporator to defrost; the air duct is also provided with a defrosting air outlet opening; a refrigeration air return opening is also provided at the connection between the air return opening and the storage chamber; an air duct cover plate, on which there are cover plate air outlet openings corresponding to the number and positions of the air outlet openings, and a cover plate baffle for controlling the communication between the air return opening and the defrosting air outlet opening / the refrigeration air return opening; a driving device for driving the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlet opening corresponds to the cover plate air outlet opening in position, and the air return opening is communicated with the refrigeration air return opening; when the air duct cover plate is in the second position, the air outlet opening and the cover plate air outlet opening are staggered in position, and the air return opening is communicated with the defrosting air outlet opening; a controller configured to: when starting the defrosting mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position. The solution of the present application can avoid the problem that heat is lost to the storage chamber during defrosting, resulting in low heating defrosting efficiency and an increase in the temperature inside the storage chamber. Description of the Drawings

[0056] Figure 1 It is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0057] Figure 2 It is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0058] Figure 3 It is a schematic diagram of the structure of the refrigeration system in the refrigerator provided by an embodiment of the present invention;

[0059] Figure 4 It is a schematic diagram of the structure of the refrigerator provided by an embodiment of the present invention;

[0060] Figure 5 It is another schematic diagram of the structure of the refrigerator provided by an embodiment of the present invention;

[0061] Figure 6 It is yet another schematic diagram of the structure of the refrigerator provided by an embodiment of the present invention;

[0062] Figure 7 It is a schematic flowchart of the steps executed by the controller provided by an embodiment of the present invention;

[0063] Figure 8 It is another schematic flowchart of the steps executed by the controller provided by an embodiment of the present invention;

[0064] Figure 9 It is a schematic diagram of the structure of the driving device provided by an embodiment of the present invention;

[0065] Figure 10 It is a partial schematic diagram of the air duct provided by an embodiment of the present invention;

[0066] Figure 11 It is a schematic diagram of the structure of the air duct cover plate in different positions provided by an embodiment of the present invention;

[0067] Figure 12 It is a schematic diagram of the cover plate baffle provided by an embodiment of the present invention. Detailed implementation manners

[0068] 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 making creative efforts shall fall within the protection scope of the present invention.

[0069] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is 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.

[0070] The terms "first" and "second" are only used for descriptive purposes and should not 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 specified, the meaning of "a plurality" is two or more.

[0071] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. 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 circumstances.

[0072] See Figure 1 , Figure 1 FIG. 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 defining 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 foods, etc.

[0073] See Figure 2 , Figure 2This 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 multiple storage rooms. The storage rooms can be configured as refrigerators and freezers according to different uses. They can also include variable temperature rooms, vacuum drawers, moisturizing drawers, etc. Each storage room corresponds to one or more door bodies, and the storage room on the upper part of the refrigerator is provided with a double-opening door body. Among them, the door body can be pivotally set at the opening of the box body, and can also be opened in a drawer-like manner to achieve drawer-like storage. A display screen is provided at the door of the refrigerator, and the display screen is used to display prompt information and receive user touch operations.

[0074] See also Figure 3 , Figure 3 The 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.

[0075] The refrigerator provided by the embodiment of the present invention comprises:

[0076] a box body, in which at least one storage chamber is formed;

[0077] an air duct, which is in communication with the storage chamber via an air outlet and an air return port in communication with the storage chamber, and is used to realize air circulation between the evaporator arranged therein and the storage chamber;

[0078] A heating wire is provided on the evaporator and is used to heat the evaporator for defrosting;

[0079] The air duct is further provided with a defrosting air outlet;

[0080] A refrigeration return air outlet is further provided at the connection between the return air outlet and the storage chamber;

[0081] An air duct cover plate, on which there are cover plate air outlets corresponding to the number and positions of the air outlets, and a cover plate baffle for controlling the communication between the return air outlet and the defrosting air outlet / the refrigeration return air outlet;

[0082] A driving device for driving the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlets correspond to the cover plate air outlets in position, and the return air outlet communicates with the refrigeration return air outlet; when the air duct cover plate is in the second position, the air outlets are staggered with the cover plate air outlets in position, and the return air outlet communicates with the defrosting air outlet;

[0083] A controller configured as follows:

[0084] When starting the defrosting mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position.

[0085] When specifically implementing this embodiment, refer to Figures 4 to 5 , which is a schematic structural diagram of a refrigerator provided by an embodiment of the present invention. The refrigerator is provided with an air duct, and the air duct is connected to the storage chamber through the provided air outlets to deliver the cold air generated by the evaporator provided in the air duct to the storage chamber to cool the storage chamber, and for the air circulation between the storage chamber and the air duct in the refrigerator. The storage chamber also needs to be provided with a refrigeration return air outlet for returning the air in the storage chamber to the air duct through the return air outlet provided in the air duct, and then cooling it again through the evaporator to form a refrigeration air circulation and continuously cool the inside of the storage chamber.

[0086] To achieve defrosting of the evaporator, a heating wire is provided on the evaporator, and heat is generated by the heating wire to defrost the evaporator pipeline, avoiding excessive frosting on the evaporator and affecting the normal refrigeration of the evaporator.

[0087] To avoid the influence of the heat generated by the heating wire on the temperature of the storage chamber when the refrigerator is defrosted, the heat is lost to the storage chamber through the air outlet and the return air outlet, resulting in temperature fluctuations in the storage chamber and affecting the normal refrigeration of the storage chamber. This application designs an air duct cover plate to isolate the storage chamber and the air duct.

[0088] It should be noted that in the drawings provided in this embodiment, the number of the air outlets and the cover plate air outlets is 1. In other embodiments, the number of the air outlets can be designed as multiple.

[0089] The air duct cover plate is designed with cover plate outlets, and the number and positions of the cover plate outlets correspond to the air outlets.

[0090] The air duct is also designed with a defrost air outlet, and a cover plate baffle for controlling the communication between the return air outlet and the defrost air outlet / the refrigeration return air outlet is arranged on the air duct cover plate.

[0091] In order to realize the position movement of the air duct cover plate, a driving device is also designed in the solution of the present application, which is used to drive the air duct cover plate to switch between the first position and the second position.

[0092] See Figure 4 , when the air duct cover plate is in the first position, at this time the cover plate air outlet corresponds to the air outlet of the air duct, at this time the cover plate baffle blocks the defrost air outlet, at this time, the air outlet of the air duct and the cover plate air outlet are communicated, the return air outlet of the air duct is communicated with the refrigeration return air, and a refrigeration air circulation is formed between the air duct and the storage chamber, and at this time the evaporator can refrigerate normally.

[0093] See Figure 5 , when the air duct cover plate is in the second position, at this time the cover plate air outlet does not correspond to the air outlet of the air duct, the air outlet of the air duct is blocked by the air duct cover plate, at this time the cover plate baffle blocks the refrigeration return air outlet, the return air outlet of the air duct and the defrost air outlet are communicated, the return air outlet of the air duct is blocked, at this time the air duct and the storage chamber are separated, and the air duct is communicated with the return air outlet through the defrost air outlet, forming a defrost cycle in the air duct, and at this time the evaporator can be defrosted without affecting the temperature of the storage chamber.

[0094] The controller provided in this embodiment controls the defrosting process of the refrigerator by controlling the heating wire and the driving device.

[0095] Specifically, after starting the defrosting mode, that is, when receiving the defrost control instruction, the defrosting mode is started.

[0096] It should be noted that the defrost control instruction can be actively generated by the user by triggering a set button, or the refrigerator can actively detect the operating condition of the refrigerator. When it is detected that the state data of the refrigerator meets the preset defrost control conditions, the defrost control instruction is passively generated to trigger the refrigerator to defrost.

[0097] After starting the defrosting mode, the refrigerator turns on the heating wire to heat the pipeline of the evaporator, and controls the driving device to switch the air duct cover plate from the first position to the second position. See Figure 5 , at this time the cover plate air outlet does not correspond to the air outlet of the air duct, the air outlet of the air duct is blocked by the air duct cover plate, at this time the cover plate baffle blocks the refrigeration return air outlet, the return air outlet of the air duct and the defrost air outlet are communicated, the return air outlet of the air duct is blocked, at this time the air duct and the storage chamber are separated. The air duct is communicated with the return air outlet through the defrost air outlet, forming a defrost cycle in the air duct, and at this time the evaporator can be defrosted without affecting the temperature of the storage chamber.

[0098] At this time, the operation of the fan provided in the air duct can also be controlled. Through the connection between the defrost air outlet and the return air outlet, a defrost air circulation is formed in the air duct. While reducing the impact on the temperature of the storage compartment, the air flow in the air duct is accelerated, and the defrost efficiency is increased.

[0099] In another embodiment provided by the present invention, the controller is further configured to:

[0100] When starting the refrigeration mode, turn off the heating wire and switch the air duct cover plate from the second position to the first position.

[0101] When specifically implementing this embodiment, after starting the refrigeration mode, that is, when receiving a refrigeration control instruction, start the refrigeration mode.

[0102] It should be noted that the refrigeration control instruction can be actively generated by the user by triggering a set button, or the refrigerator can actively detect the operating condition of the refrigerator. When the detected status data of the refrigerator meets the preset refrigeration control conditions, a refrigeration control instruction is passively generated to trigger the refrigerator to refrigerate.

[0103] After starting the defrost mode, control to turn off the heating wire, stop heating the pipeline of the evaporator, and control the driving device to switch the air duct cover plate from the second position to the first position. See Figure 4 , at this time, the cover air outlet corresponds to the air outlet position of the air duct. At this time, the cover baffle blocks the defrost air outlet. At this time, the air outlet of the air duct is connected to the cover air outlet, the return air outlet of the air duct is connected to the refrigeration return air, and a refrigeration air circulation is formed between the air duct and the storage compartment. At this time, the evaporator can refrigerate normally to realize the cooling of the storage compartment inside the refrigerator and maintain the normal refrigeration of the refrigerator.

[0104] In another embodiment provided by the present invention, the refrigerator further includes:

[0105] A fan, provided in the air duct, for controlling the gas flow direction and gas flow rate in the air duct;

[0106] A temperature sensor, which is used to detect the current temperature of the evaporator pipeline;

[0107] The heating wire is arranged at the bottom of the evaporator;

[0108] The controller is further configured to:

[0109] When starting the defrost mode, obtain the current temperature;

[0110] When the current temperature is not greater than the preset defrost temperature, by controlling the rotation direction of the fan, control the gas flow direction to pass through the evaporator from bottom to top;

[0111] When the current temperature is greater than the defrosting temperature, by controlling the rotation direction of the blower, the gas flow direction is controlled to pass through the evaporator from top to bottom.

[0112] When specifically implementing this embodiment, refer to Figure 6 , which is another structural schematic diagram of the refrigerator provided by the embodiment of the present invention. In Figure 6 , on the air duct cover plate, there are cover plate air outlets corresponding to the position and quantity of the air duct air outlet. A blower is also provided in the air duct. The blower is used to accelerate the air flow rate in the air duct, speed up the air flow rate of the refrigeration cycle or the defrosting cycle, and the blower can also control the gas flow direction in the air duct, that is, by the forward or reverse rotation of the blower, the air outlet direction of the blower is changed to control the gas flow rate direction in the air duct.

[0113] In this embodiment, the heating wire is arranged at the bottom of the evaporator, and the temperature sensor is arranged on the pipeline of the evaporator to detect the temperature of the evaporator pipeline.

[0114] When specifically implementing this embodiment, the controller controls the defrosting process by detecting the temperature of the evaporator.

[0115] Refer to Figure 7 , which is a schematic flow chart of the steps executed by the controller provided by the embodiment of the present invention. The controller specifically executes the following steps:

[0116] Step S701, start the defrosting mode;

[0117] Step S702, turn on the heating wire and switch the air duct cover plate to the second position;

[0118] Step S703, obtain the current temperature T. That is, obtain the current temperature T of the evaporator pipeline through the temperature sensor arranged on the evaporator;

[0119] Step S704, determine whether the current temperature T ≤ T th1 is established, that is, determine whether the current temperature T is not greater than the preset defrosting temperature T th1 .

[0120] If so, execute step S705;

[0121] If not, execute step S706.

[0122] Step S705, control the blower to rotate forward, and return to step S703. At this time, control the blower to rotate forward, and the rotation direction is the same as the air direction in the freezing compartment refrigeration mode. At this time, the gas flow direction is the first flow direction A. The air is blown into the air duct cavity by the blower, returns to the bottom of the evaporator, flows through the evaporator from bottom to top, brings the heat of the defrosting heater at the bottom of the evaporator to the evaporator, and then is sucked by the blower.

[0123] Step S706, control the fan to rotate in reverse. At this time, the gas flow direction is the second flow direction B. Air is blown into the evaporator cavity by the fan, flows through the evaporator from top to bottom, accelerates the shedding of the remaining defrosting water on the evaporator, is sent to the air duct cavity through the bottom of the evaporator, and then is sucked by the fan.

[0124] It should be noted that in this embodiment, through the installation position of the fan and the direction of the fan air outlet, when the fan rotates forward, the gas flow direction is the first flow direction A, and the gas flow direction is from bottom to top through the evaporator. In other embodiments, through the installation position of the fan and the setting of the fan air outlet direction, when the fan rotates, the gas flow direction is the first flow direction A, and the corresponding control process is corresponding, which will not be elaborated here.

[0125] In this embodiment, by detecting the temperature on the evaporator, the operation direction of the fan is controlled. When the temperature of the evaporator is relatively low, there is still frost on the evaporator at this time, and the fan rotates forward. Air flows through the evaporator from bottom to top, bringing the heat of the bottom heater of the evaporator to all parts of the evaporator, improving the defrosting efficiency. When the temperature of the evaporator rises to the preset temperature, there is no frost on the evaporator at this time, and the fan rotates in reverse. Air flows through the evaporator from top to bottom, accelerating the dripping of the remaining defrosting water droplets on the surface of the evaporator fins, shortening the time of natural water flow, shortening the defrosting time, avoiding long-term defrosting, and being unable to provide cold air for the storage room, affecting the normal operation of the storage room.

[0126] In another embodiment provided by the present invention, the controller is further configured to:

[0127] When starting the refrigeration mode, turn off the heating wire, and detect the current temperature of the evaporator pipeline through the set temperature sensor;

[0128] When the current temperature is less than the preset refrigeration temperature, switch the air duct cover plate from the second position to the first position.

[0129] When specifically implementing this embodiment, refer to Figure 8 , which is another flow schematic diagram of the steps executed by the controller provided by the embodiment of the present invention. When the controller enters the refrigeration mode, it specifically executes the following steps:

[0130] Step S801, start the refrigeration mode;

[0131] Step S802, turn off the heating wire; at this time, the evaporator normally refrigerates and generates cold air.

[0132] Step S803, obtain the current temperature T. That is, obtain the current temperature T of the evaporator pipeline through the temperature sensor set on the evaporator;

[0133] Step S804, determine whether the current temperature T < T th2 holds, that is, determine whether the current temperature T is less than the preset refrigeration temperature T th2 .

[0134] If not, return to step S803; that is, when the current temperature T of the evaporator is higher than or equal to the preset refrigeration temperature T of the evaporator th2 , maintain the current state and continue refrigerating to further reduce the temperature of the evaporator.

[0135] If so, execute step S805.

[0136] Step S805, switch the air duct cover plate to the first position.

[0137] The current temperature of the evaporator is detected in real time through a temperature sensor, and the position of the air duct cover plate is adjusted according to the current temperature of the evaporator. Only when the temperature of the evaporator drops to the refrigeration temperature, the air duct cover plate is controlled to connect the air duct with the storage compartment to cool the storage compartment, avoiding the situation that when the refrigeration is resumed, the temperature of the evaporator is relatively high at this time. After the air duct cover plate is opened, the heat of the evaporator is dissipated into the storage compartment, affecting the normal refrigeration of the storage compartment.

[0138] In another embodiment provided by the present invention, the controller is further configured to:[[]]

[0139] When starting the defrosting mode, turn off the evaporator;

[0140] When starting the refrigeration mode, start the evaporator.

[0141] When specifically implementing this embodiment, after the controller starts the defrosting mode, the refrigeration function of the evaporator can be actively turned off at this time, that is, the refrigeration circuit of the refrigerator stops working, and at this time, the refrigeration circuit of the refrigerator does not generate refrigerant to be delivered to the evaporator for heat exchange. This avoids ineffective refrigeration of the evaporator and affects the normal defrosting process of the heating wire.

[0142] After the controller starts the refrigeration mode, the heating wire is turned off at this time, and the evaporator in the off state needs to be actively turned on. The refrigerator's refrigeration circuit generates refrigerant to be delivered to the evaporator for heat exchange. Heat is generated by the evaporator and transmitted to the storage compartment through the air duct to achieve refrigerator refrigeration.

[0143] By controlling the start and stop of the evaporator, it is beneficial to the operation of the refrigerator defrosting function and can reduce energy consumption.

[0144] In another embodiment provided by the present invention, the driving device specifically includes:[[]]

[0145] A nut, arranged on the air duct cover plate, and the air duct cover plate is restricted to slide only between the first position and the second position;

[0146] A screw, which meshes with the nut;

[0147] A driving motor, which is used to drive the screw to rotate forward or backward, driving the nut to move relative to the screw to control the air duct cover plate to move between the first position and the second position.

[0148] During the specific implementation of this embodiment, refer to Figure 9 , which is a schematic structural diagram of the driving device provided by the embodiment of the present invention.

[0149] The driving device includes a driving motor, a screw and a nut.

[0150] The driving motor is fixedly installed on the refrigerator, the screw is connected to the driving motor, and the driving motor drives the screw to rotate.

[0151] The nut has an internal thread structure and is fixed on the front cover plate of the air duct. The thread of the nut meshes with the thread of the screw. When the screw rotates, it drives the nut to rotate. The nut is connected to the air duct cover plate, but the air duct cover plate is restricted to only slide between the first position and the second position. Therefore, when the screw rotates, it cannot drive the nut to rotate. At this time, it can only drive the nut to move along the direction of the screw, that is, slide between the first position and the second position. Therefore, by driving the screw to rotate forward or backward, the nut can be driven to move relative to the screw to control the air duct cover plate to move between the first position and the second position, realizing the position movement of the air duct cover plate.

[0152] It should be noted that in this embodiment, the driving device is specifically set as a screw driving structure. In other embodiments, the driving device can be specifically set as other structures.

[0153] Through the cooperation of the thread and the screw, the air duct cover plate can be smoothly driven to slide between the first position and the second position.

[0154] In another embodiment provided by the present invention, the air outlet is arranged on the front surface of the air duct foam board of the air duct;

[0155] The air duct cover plate is arranged closely against the front surface of the air duct foam board;

[0156] The middle of the air duct foam board is hollowed out to form an air duct chamber, and its front surface is connected to the air duct;

[0157] The defrosting air outlet is arranged at the bottom of the air duct foam board.

[0158] During the specific implementation of this embodiment, refer to Figure 10 , which is a partial structural schematic diagram of the air duct provided by the embodiment of the present invention.

[0159] In the figure, the air duct includes an air duct foam board, and the air outlet of the air duct is arranged on the air duct foam board; an air outlet is arranged on the front surface of the air duct foam board, which communicates with the evaporator chamber of the evaporator, and the air flow in the air duct is accelerated by the arranged fan.

[0160] The air duct foam board is arranged on one side of the freezer compartment, including the front surface and the back surface of the air duct foam board, and at least one air outlet is arranged on the back surface of the air duct foam board close to the freezer compartment.

[0161] The air duct cover plate is closely arranged against the back surface of the air duct foam board, and cover plate air outlets corresponding to the position and quantity of the air duct foam board are arranged on the air duct cover plate.

[0162] The fan is located above the evaporator and is arranged in the cavity between the front surface and the back surface of the air duct foam board.

[0163] An evaporator chamber is formed between the back surface of the air duct foam board and the rear wall of the freezer compartment, an air duct chamber is formed between the back surface and the front surface of the air duct foam board, and the freezer compartment is located between the back surface of the air duct foam board and the freezer door.

[0164] When the air duct cover plate is in the first position, the air outlets arranged on the back surface of the air duct foam board and the cover plate air outlets on the air duct cover plate correspond one by one, and the evaporator chamber, the air duct chamber and the freezer compartment are connected.

[0165] The defrosting air outlet is arranged at the bottom of the air duct foam board to form the air outlet of the defrosting circulation pipeline.

[0166] In another embodiment provided by the present invention, the cover plate baffle arranged at the bottom of the air duct cover plate is vertically arranged with it;

[0167] The driving device drives the air duct cover plate to slide up and down. When the air duct cover plate is in the first position, the cover plate baffle covers the defrosting air outlet, and the air return openings and the refrigeration air return openings respectively arranged on the left and right sides of the air duct cover plate are communicated through the channel formed by the cover plate baffle and the bottom of the air duct;

[0168] When the air duct cover plate is in the second position, the cover plate baffle contacts the bottom of the air duct, the air return openings and the refrigeration air return openings are isolated by the air duct cover plate, and the air return openings and the defrosting air outlet are communicated.

[0169] When specifically implementing this embodiment, refer to Figure 10 , a cover plate baffle perpendicular to it is arranged at the bottom of the air duct cover plate. Therefore, the air duct cover plate forms a "T" - shaped structure, which just corresponds to the defrosting air outlet at the bottom of the air duct foam board closely arranged with it. By controlling the position of the air duct cover plate, it can be controlled whether the defrosting air outlet is blocked by the cover plate baffle.

[0170] The air outlet of the air duct and the refrigeration return air outlet are respectively arranged on the left and right sides of the air duct cover plate. By controlling the channel between the cover plate baffle arranged at the bottom of the air duct cover plate and the bottom of the air duct, it is possible to control whether the air outlet of the air duct is communicated with the refrigeration return air outlet.

[0171] See Figure 11 , which is a schematic structural diagram of the air duct cover plate in different positions provided by the embodiment of the present invention. See Figure 11 In (1) of [], it is a schematic structural diagram of the air duct cover plate in the first position. At this time, the air outlet corresponds to the position of the cover plate air outlet, and the return air outlet is communicated with the refrigeration return air outlet. The cover plate baffle covers the defrosting air outlet, and the return air outlet and the refrigeration return air outlet are communicated through the channel formed by the cover plate baffle and the bottom of the air duct. At this time, the air duct is communicated with the storage chamber through the air outlet and the return air outlet to transfer the cold quantity into the storage chamber for cooling.

[0172] See Figure 11 In (2) of [], it is a schematic structural diagram of the air duct cover plate in the second position. At this time, the air outlet of the air duct is staggered with the cover plate air outlet, the air outlet of the air duct is blocked, and the cover plate baffle contacts the bottom of the air duct. At this time, there is no blockage at the defrosting air outlet, and the return air outlet and the refrigeration return air outlet are separated by the air duct cover plate. At this time, the defrosting air outlet is connected to the air duct return air outlet to form a defrosting internal circulation.

[0173] In another embodiment provided by the present invention, a sealing rubber strip is arranged at the bottom of the cover plate baffle.

[0174] During the specific implementation of this embodiment, see Figure 12 , which is a schematic structural diagram of the cover plate baffle provided by the embodiment of the present invention.

[0175] A sealing rubber strip is arranged at the bottom of the cover plate baffle so that after the front cover plate of the air duct moves down, it is in close contact with the bottom of the freezer to realize the sealing between the evaporator chamber and the freezer compartment.

[0176] Another embodiment of the present invention provides a refrigerator defrosting control method, and the refrigerator includes:

[0177] A box body, in which at least one storage chamber is formed;

[0178] An air duct, which is communicated with the storage chamber through an air outlet and a return air outlet communicated with the storage chamber, and is used to realize the air circulation between the evaporator arranged inside it and the storage chamber;

[0179] A heating wire, which is arranged on the evaporator and is used to heat the evaporator for defrosting;

[0180] The air duct is also provided with a defrosting air outlet;

[0181] A refrigeration air return opening is also provided at the connection between the air return opening and the storage chamber.

[0182] An air duct cover plate, on which there are cover plate air outlet openings corresponding to the number and positions of the air outlet openings, and a cover plate flap for controlling the connection between the air return opening and the defrost air outlet opening / the refrigeration air return opening;

[0183] A driving device for driving the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlet opening corresponds to the cover plate air outlet opening, and the cover plate flap controls the connection between the air return opening and the refrigeration air return opening;

[0184] When the air duct cover plate is in the second position, the air outlet opening and the cover plate air outlet opening are staggered in position, and the cover plate flap controls the connection between the air return opening and the defrost air outlet opening;

[0185] A controller;

[0186] The method includes:

[0187] When starting the defrost mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position.

[0188] To avoid the influence of the temperature in the storage chamber caused by the heat generated by the heating wire flowing out through the air outlet opening and the air return opening into the storage chamber during defrosting of the refrigerator, resulting in temperature fluctuations in the storage chamber and affecting the normal refrigeration of the storage chamber. In this application, an air duct cover plate is designed to isolate the storage chamber from the air duct.

[0189] Cover plate outlets are designed on the air duct cover plate, and the number and positions of the cover plate outlets correspond to the air outlet openings.

[0190] A defrost air outlet opening is also designed on the air duct, and a cover plate flap for controlling the connection between the air return opening and the defrost air outlet opening / the refrigeration air return opening is provided on the air duct cover plate.

[0191] To achieve the position movement of the air duct cover plate, a driving device is designed in the solution of this application to drive the air duct cover plate to switch between the first position and the second position. When the air duct cover plate is in the first position, the air outlet of the cover plate corresponds to the air outlet of the air duct at this time. At this time, the cover plate baffle blocks the defrost air outlet. At this time, the air outlet of the air duct and the air outlet of the cover plate are connected, the return air duct of the air duct is connected to the refrigeration return air, and the air duct and the storage room form a refrigeration air cycle. At this time, the evaporator can refrigerate normally. When the air duct cover plate is in the second position, the air outlet of the cover plate does not correspond to the air outlet of the air duct at this time. The air outlet of the air duct is blocked by the air duct cover plate. At this time, the cover plate baffle blocks the refrigeration return air duct. The return air duct of the air duct is connected to the defrost air outlet, and the return air duct of the air duct is blocked. At this time, the air duct and the storage room are separated, and the air duct is connected to the return air duct through the defrost air outlet to form a defrost cycle in the air duct. At this time, the evaporator can be defrosted without affecting the temperature of the storage room.

[0192] After starting the defrost mode, that is, when receiving the defrost control instruction, start the defrost mode.

[0193] It should be noted that the defrost control instruction can be actively generated by the user by triggering the set button, or the refrigerator can actively detect the operation status of the refrigerator. When it detects that the status data of the refrigerator meets the preset defrost control conditions, it passively triggers and generates the defrost control instruction to trigger the refrigerator to defrost.

[0194] After starting the defrost mode, the refrigerator turns on the heating wire to heat the pipeline of the evaporator, and controls the driving device to switch the air duct cover plate from the first position to the second position. See Figure 5 , at this time the air outlet of the cover plate does not correspond to the air outlet of the air duct, the air outlet of the air duct is blocked by the air duct cover plate, at this time the cover plate baffle blocks the refrigeration return air duct, the return air duct of the air duct is connected to the defrost air outlet, and the return air duct of the air duct is blocked. At this time, the air duct and the storage room are separated. The air duct is connected to the return air duct through the defrost air outlet to form a defrost cycle in the air duct. At this time, the evaporator can be defrosted without affecting the temperature of the storage room.

[0195] At this time, the operation of the fan set in the air duct can also be controlled. Through the connection of the defrost air outlet and the return air duct, a defrost air cycle is formed in the air duct, which can accelerate the air flow in the air duct and improve the defrost efficiency while reducing the impact on the temperature of the storage room.

[0196] 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. Their working principles and beneficial effects correspond one by one. For the specific working flow chart, see Figures 7 to 8 , so it will not be elaborated here.

[0197] 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 disk, a read-only memory (ROM), or a random access memory (RAM), etc.

[0198] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A refrigerator, characterized in that, it includes: a box body in which at least one storage chamber is formed; an air duct that communicates with the storage chamber through an air outlet and an air return opening that communicate with the storage chamber, and is used to realize the air circulation between the evaporator provided inside it and the storage chamber; a heating wire provided on the evaporator for heating the evaporator to defrost; the air duct is also provided with a defrost air outlet; a refrigeration air return opening is also provided at the connection between the air return opening and the storage chamber; an air duct cover plate, on which there are cover plate air outlets corresponding to the number and position of the air outlets, and a cover plate baffle for controlling the communication between the air return opening and the defrost air outlet / the refrigeration air return opening; a driving device for driving the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlet corresponds to the cover plate air outlet in position, and the air return opening communicates with the refrigeration air return opening; when the air duct cover plate is in the second position, the air outlet and the cover plate air outlet are staggered in position, and the air return opening communicates with the defrost air outlet; a controller configured to: when starting the defrost mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position.

2. The refrigerator according to claim 1, characterized in that, the controller is further configured to: when starting the refrigeration mode, turn off the heating wire and switch the air duct cover plate from the second position to the first position.

3. The refrigerator according to claim 1, characterized in that, the refrigerator further includes: a fan provided in the air duct for controlling the gas flow direction and gas flow rate in the air duct; a temperature sensor for detecting the current temperature of the evaporator pipeline; the heating wire is provided at the bottom of the evaporator; the controller is further configured to: when starting the defrost mode, obtain the current temperature; when the current temperature is not greater than a preset defrost temperature, control the gas flow direction to pass through the evaporator from bottom to top by controlling the rotation direction of the fan; when the current temperature is greater than the defrost temperature, control the gas flow direction to pass through the evaporator from top to bottom by controlling the rotation direction of the fan.

4. The refrigerator according to claim 1, characterized in that, the controller is further configured to: when starting the refrigeration mode, turn off the heating wire and detect the current temperature of the evaporator pipeline through the provided temperature sensor; when the current temperature is less than a preset refrigeration temperature, switch the air duct cover plate from the second position to the first position.

5. The refrigerator according to claim 1, characterized in that, the controller is further configured to: when starting the defrost mode, turn off the evaporator; when starting the refrigeration mode, start the evaporator.

6. The refrigerator according to claim 1, characterized in that, the driving device specifically includes: a nut provided on the air duct cover plate, and the air duct cover plate is restricted to only slide between the first position and the second position; a screw rod meshed with the nut; A driving motor, which is used to drive the screw to rotate forward or backward, drive the nut to move relative to the screw, so as to control the movement of the air duct cover plate between the first position and the second position.

7. The refrigerator according to claim 1, characterized in that, the air outlet is arranged on the back of the air duct foam board of the air duct; the air duct cover plate is arranged close to the back of the air duct foam board; the middle of the air duct foam board is hollowed out to form an air duct chamber, and its front is connected to the air duct; the defrost air outlet is arranged at the bottom of the air duct foam board.

8. The refrigerator according to claim 7, characterized in that, the cover plate baffle arranged at the bottom of the air duct cover plate is vertically arranged with it; the driving device drives the air duct cover plate to slide up and down. When the air duct cover plate is in the first position, the cover plate baffle covers the defrost air outlet, and the air return openings and the refrigeration air return openings respectively arranged on the left and right sides of the air duct cover plate are communicated through the channel formed by the cover plate baffle and the bottom of the air duct; when the air duct cover plate is in the second position, the cover plate baffle contacts the bottom of the air duct, the air return openings and the refrigeration air return openings are isolated by the air duct cover plate, and the air return opening and the defrost air outlet are communicated.

9. The refrigerator according to claim 8, characterized in that, a sealing strip is arranged at the bottom of the cover plate baffle.

10. A refrigerator defrosting control method, characterized in that, the refrigerator includes: a box body, in which at least one storage chamber is formed; an air duct, which is communicated with the storage chamber through an air outlet and an air return opening communicated with the storage chamber, and is used to realize the air circulation between the evaporator arranged inside it and the storage chamber; a heating wire, arranged on the evaporator, used to heat the evaporator for defrosting; the air duct is also provided with a defrost air outlet; a refrigeration air return opening is also arranged at the connection between the air return opening and the storage chamber; an air duct cover plate, on which there are cover plate air outlets corresponding to the number and position of the air outlets, and a cover plate baffle used to control the communication between the air return opening and the defrost air outlet / the refrigeration air return opening; a driving device, which is used to drive the air duct cover plate to switch between a preset first position and a preset second position; when the air duct cover plate is in the first position, the air outlet corresponds to the cover plate air outlet in position, and the cover plate baffle controls the communication between the air return opening and the refrigeration air return opening; when the air duct cover plate is in the second position, the air outlet and the cover plate air outlet are staggered in position, and the cover plate baffle controls the communication between the air return opening and the defrost air outlet; a controller; the method includes: when starting the defrosting mode, turn on the heating wire and switch the air duct cover plate from the first position to the second position.

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