Refrigerator and control method thereof

Abstract

According to the refrigerator and the control method thereof, a refrigerating air door and a freezing air door are arranged on an air duct for communicating an evaporator with a refrigerator chamber, whether the temperature of a refrigerating chamber needs to be compensated or not can be determined by further combining the temperature conditions of the refrigerating chamber and a freezing chamber in a low-temperature environment, and when the temperature of the refrigerating chamber needs to be compensated, the refrigerating chamber is opened; the freezing air door is closed, the refrigeration air door is opened, the temperature of the refrigerating chamber is compensated through heat generated by defrosting of the evaporator, and the situation that the compressor cannot operate normally due to the too low temperature of the refrigerating chamber is avoided. In addition, the temperatures of the refrigerating chamber and the freezing chamber can be reasonably controlled by combining opening and closing of the freezing air door and the refrigerating air door, so that the temperatures of the refrigerating chamber and the freezing chamber are kept balanced.

Description

Technical Field

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

[0002] When the refrigerator is refrigerating, the thermostat detects the refrigeration temperature and controls the start and stop of the compressor according to the refrigeration temperature to achieve temperature balance in the compartment. When the refrigeration temperature reaches the shutdown temperature, it means that the compartment temperature is low enough. At this time, the compressor needs to be stopped and the refrigeration needs to be suspended. When the refrigeration temperature reaches the start-up temperature, it means that the compartment temperature has risen a lot after a period of time. At this time, the compressor needs to be started to continue refrigeration to reduce the compartment temperature. This cycle is repeated to achieve temperature balance in the compartment. However, when the ambient temperature is low in winter, the temperature in the refrigeration room remains low, the thermostat cannot work, and the compressor cannot start normally, which will affect the refrigeration of the refrigerator. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide a refrigerator and a control method thereof, which can compensate the temperature of the refrigerating chamber by the heat generated by defrosting in a low-temperature environment, thereby avoiding the compressor from being unable to operate normally due to the refrigerating chamber being too low in temperature.

[0004] To achieve the above object, an embodiment of the present invention provides a refrigerator, comprising:

[0005] A box body, in which at least one storage chamber and an air duct are formed, the storage chamber at least includes a refrigerating chamber and a freezing chamber, and the air duct is provided with a refrigerating air door and a freezing air door;

[0006] A refrigeration system, arranged in the box, for providing cold air to the storage room, the refrigeration system comprising a compressor, an evaporator and a condenser connected by pipelines;

[0007] A defrost heater, disposed in the box, for defrosting the evaporator;

[0008] A defrost real-time temperature sensor is provided on one side of the defrost heater and is used to detect the defrost real-time temperature;

[0009] The controller is configured as:

[0010] When it is detected that the ambient temperature is lower than a preset low temperature threshold, and the real-time refrigeration temperature and the real-time freezing temperature meet the preset compartment low temperature conditions, the compressor is controlled to stop and the freezing damper is closed;

[0011] Starting the defrost heater and obtaining the defrost real-time temperature detected by the defrost real-time temperature sensor;

[0012] When the real-time defrosting temperature is greater than a preset defrosting low temperature threshold, the refrigeration damper is opened.

[0013] As an improvement of the above solution, when it is detected that the ambient temperature is lower than a preset low temperature threshold, the controller is further configured to:

[0014] Obtaining the real-time refrigeration temperature of the refrigeration chamber;

[0015] When the real-time refrigeration temperature is lower than the preset low-temperature refrigeration threshold value and lasts for a preset period of time, obtaining the real-time freezing temperature of the freezing chamber;

[0016] When the real-time freezing temperature is less than a preset freezing low temperature threshold, it is determined that the real-time refrigeration temperature and the real-time freezing temperature meet the compartment low temperature condition.

[0017] As an improvement of the above solution, after the refrigeration damper is opened, the controller is further configured to:

[0018] When the real-time defrost temperature is greater than a preset defrost high temperature threshold, the refrigeration damper is closed; wherein the temperature difference between the defrost high temperature threshold and the defrost low temperature threshold is greater than a preset temperature difference threshold.

[0019] As an improvement of the above solution, the controller is further configured as follows:

[0020] After the compressor is stopped, if it is detected that the real-time refrigeration temperature and the real-time freezing temperature do not meet the low temperature condition of the compartment, the compressor is controlled to start;

[0021] When it is detected that the refrigerating chamber and the freezing chamber need to be refrigerated at the same time, the freezing damper is closed and the refrigerating damper is opened;

[0022] When the real refrigeration temperature reaches the shutdown temperature, the refrigeration damper is closed and the freezing damper is opened.

[0023] As an improvement of the above scheme, the freezing air door includes a freezing air outlet door and a freezing air return outlet door; wherein, the freezing air outlet door is arranged in a freezing air duct connected to the freezing chamber air outlet, and the freezing return air outlet door is arranged in a freezing air duct connected to the freezing chamber air return outlet.

[0024] To achieve the above object, an embodiment of the present invention further provides a refrigerator control method, wherein the refrigerator is formed with at least one storage chamber and an air duct, the storage chamber includes at least a refrigerating chamber and a freezing chamber, and the air duct is provided with a refrigerating air door and a freezing air door; then, the refrigerator control method comprises:

[0025] When it is detected that the ambient temperature is lower than the preset low temperature threshold, and the real-time refrigeration temperature and the real-time freezing temperature meet the preset compartment low temperature conditions, the compressor is controlled to stop and the freezing damper is closed;

[0026] Start the defrost heater in the refrigerator and obtain the defrost real-time temperature detected by the defrost real-time temperature sensor;

[0027] When the real-time defrosting temperature is greater than the preset defrosting low temperature threshold, the refrigeration damper is opened.

[0028] As an improvement of the above solution, when it is detected that the ambient temperature is lower than a preset low temperature threshold, the method further includes:

[0029] Obtaining the real-time refrigeration temperature of the refrigeration chamber;

[0030] When the real-time refrigeration temperature is lower than the preset low-temperature refrigeration threshold value and lasts for a preset period of time, obtaining the real-time freezing temperature of the freezing chamber;

[0031] When the real-time freezing temperature is less than a preset freezing low temperature threshold, it is determined that the real-time refrigeration temperature and the real-time freezing temperature meet the compartment low temperature condition.

[0032] As an improvement of the above solution, after opening the refrigeration damper, the method further includes:

[0033] When the real-time defrost temperature is greater than a preset defrost high temperature threshold, the refrigeration damper is closed; wherein the temperature difference between the defrost high temperature threshold and the defrost low temperature threshold is greater than a preset temperature difference threshold.

[0034] As an improvement of the above solution, the method further includes:

[0035] After the compressor is stopped, if it is detected that the real-time refrigeration temperature and the real-time freezing temperature do not meet the low temperature condition of the compartment, the compressor is controlled to start;

[0036] When it is detected that the refrigerating chamber and the freezing chamber need to be refrigerated at the same time, the freezing damper is closed and the refrigerating damper is opened;

[0037] When the real refrigeration temperature reaches the shutdown temperature, the refrigeration damper is closed and the freezing damper is opened.

[0038] As an improvement of the above scheme, the freezing air door includes a freezing air outlet door and a freezing air return outlet door; wherein, the freezing air outlet door is arranged in a freezing air duct connected to the freezing chamber air outlet, and the freezing return air outlet door is arranged in a freezing air duct connected to the freezing chamber air return outlet.

[0039] Compared with the prior art, the refrigerator and control method thereof disclosed in the present invention, by setting a refrigeration damper and a freezing damper on the air duct connecting the evaporator and the refrigerator compartment, can further combine the temperature conditions of the refrigeration compartment and the freezer compartment in a low temperature environment to determine whether it is necessary to compensate the temperature of the refrigeration compartment. When it is necessary to compensate the temperature of the refrigeration compartment, the freezing damper is closed and the refrigeration damper is opened, and the temperature of the refrigeration compartment is compensated by the heat generated by the defrosting of the evaporator, so as to avoid the compressor from not being able to operate normally due to the excessively low temperature of the refrigeration compartment. In addition, by combining the opening and closing of the freezing damper and the refrigeration damper, the temperature of the refrigeration compartment and the freezer compartment can be reasonably controlled, so that the temperature of the refrigeration compartment and the freezer compartment is kept balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0041] Figure 2 is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0042] Figure 3 is another schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0043] Figure 4 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0044] Figure 5 is a schematic diagram of the connection between the controller and other hardware devices provided by an embodiment of the present invention;

[0045] Figure 6 is a first working flow diagram of a controller provided by an embodiment of the present invention;

[0046] Figure 7 is a second working flow diagram of the controller provided by an embodiment of the present invention;

[0047] Figure 8 is a third working flow diagram of the controller provided in an embodiment of the present invention;

[0048] Fig. 9 is a fourth working flow diagram of the controller provided by an embodiment of the present invention;

[0049] Fig.10 The present invention provides a flowchart of a refrigerator control method.

[0050] Among them, 100, refrigerator; 1, compressor; 2, evaporator; 3, capillary; 4, condenser; 5, defrost heater; 11, cold storage room; 12, freezer room; 111, refrigeration temperature sensor; 112, freezing temperature sensor; 113, ambient temperature sensor; 114, defrost real-time temperature sensor. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0053] The terms "first", "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] See also Figure 1 , Figure 1It is a schematic diagram of the external structure of a refrigerator 100 provided in an embodiment of the present invention. The refrigerator described in the embodiment of the present invention is an air-cooled refrigerator. The refrigerator 100 described in the embodiment of the present invention is approximately in the shape of a rectangular parallelepiped. The refrigerator includes a box body that defines a storage space and a plurality of door bodies arranged at the opening of the box body, wherein the door body includes a door body shell located on the outside of the box body, a door body liner located on the inside of the box body, an upper end cover, a lower end cover, and an insulating layer located between the door body shell, the door body liner, the upper end cover, and the lower end cover; usually, the insulating layer is filled with foam material. The box body is provided with a chamber, wherein the chamber includes a component storage chamber for placing components in the refrigerator, such as a press cabin, etc., and also includes a storage space for storing food, etc. 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.

[0056] See also Figure 2 , Figure 2 1 is a schematic diagram of the internal structure of a refrigerator 100 provided in an embodiment of the present invention. The storage space can be divided into multiple storage rooms. The storage rooms can be configured as a refrigerating room 11 and a freezing room 12 according to different uses. They can also include a variable temperature room, a vacuum drawer, a moisturizing drawer, etc. In the refrigerator 100 shown in the embodiment of the present invention, the refrigerating room 11 is located above the freezing room 12. In other embodiments, the refrigerating room 11 can also be located below the freezing room 12. Each storage room corresponds to one or more door bodies, for example, Figure 2 In the refrigerator compartment 11 at the upper part, a double-door body is provided. The door body can be pivotally arranged at the opening of the box body, and can also be opened in a drawer-like manner to realize drawer-like storage.

[0057] See also Figure 3 , Figure 3 It is another schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention, wherein a refrigeration temperature sensor 111 is provided inside the refrigeration chamber 11, and the refrigeration temperature sensor 111 is used to obtain the real-time refrigeration temperature of the refrigeration and freezing chamber 11, and a freezing temperature sensor 112 is provided inside the freezing chamber 12, and the freezing temperature sensor 112 is used to obtain the real-time freezing temperature of the freezing chamber 12. The refrigeration chamber 11 is also provided with a refrigeration temperature adjustment potentiometer, and the refrigeration temperature adjustment potentiometer is used to adjust the temperature level of the refrigeration chamber. Furthermore, an ambient temperature sensor 113 is also provided outside the body of the refrigerator 100, and the ambient temperature sensor 113 is used to detect the ambient temperature of the environment in which the refrigerator is located.

[0058] See also Figure 4 , Figure 4The 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, 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 to 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 flow process is as follows: the saturated liquid refrigerant after condensation is filtered out of moisture and impurities by a drying filter and then flows into the capillary tube 3 through which the refrigerant is throttled and depressurized to become 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 and low-pressure gas. The refrigerant coming out of the evaporator 2 passes through the gas-liquid separator and then returns to the compressor 1, repeating the above process to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0059] See also Figure 5 , Figure 51 is a schematic diagram of the connection between the controller and other hardware devices provided in the embodiment of the present invention. The detection values ​​of the refrigeration temperature sensor 111, the freezing temperature sensor 112, the ambient temperature sensor 113 and the defrosting real-time temperature sensor 114 are obtained through the controller in the refrigerator. The controller can control the operation of the compressor 1 and the defrosting heater 5 by receiving the values ​​detected by the above-mentioned temperature sensors and comparing them with the threshold values ​​pre-stored in the system. The refrigerator described in the embodiment of the present invention also includes a defrosting heater 5. The frost-free refrigerator is equipped with a defrosting heater 5 at the lower end of the finned evaporator 2. The defrosting heater 5, the defrosting timer, the bimetallic thermostat and the temperature fuse (when the temperature exceeds the set value, the temperature fuse melts and cuts off the power supply of the electric heating tube) form an automatic defrosting system. When the compressor works for a period of time, the surface of the evaporator 2 will frost. If defrosting is not performed, the frost will become thicker and thicker. At that time, the evaporator will be filled with frost and the air duct will be blocked, forming frost blockage, so that the cold air cannot circulate and the refrigeration effect is reduced. After the controller controls the defrost timer to work for a period of time, the compressor power is automatically cut off and the defrost heater 5 is turned on. The defrost heater 5 heats to melt the frost formed on the evaporator 2. When the temperature rises to a certain temperature, the bimetallic thermostat disconnects and cuts off the power of the defrost heater 5. After the defrost is completed, the defrost timer cuts off the power of the defrost heater 5 and turns on the compressor power to resume refrigeration, and the cycle repeats itself. The defrost real-time temperature sensor 114 is arranged on one side of the defrost heater 5, close to the evaporator 2, and is used to detect the defrost real-time temperature of the evaporator 2 during defrosting.

[0060] Furthermore, the refrigerator described in the embodiment of the present invention is provided with a refrigeration air door and a freezing air door on its air duct, and the air duct includes a refrigeration air duct and a freezing air duct that are interconnected. The refrigeration air door includes one, which is arranged in the refrigeration air duct connected to the air outlet of the refrigerating chamber 11; the freezing air door includes a freezing air outlet air door and a freezing air return air door; wherein, the freezing air outlet air door is arranged in the freezing air duct connected to the air outlet of the freezing chamber 12, and the freezing air return air door is arranged in the freezing air duct connected to the air return of the freezing chamber 12. When the refrigeration air door is opened, the cold air generated by the evaporator 2 can pass through the refrigeration air duct and then flow into the refrigerating chamber 11 through the refrigeration air door. When the refrigeration air door is closed, the cold air generated by the evaporator 2 cannot flow into the refrigerating chamber 11. Similarly, when the freezing damper is opened, the cold air generated by the evaporator 2 can pass through the freezing air duct and then flow into the freezing chamber 12 through the freezing damper. When the freezing damper is closed, the cold air generated by the evaporator 2 cannot flow into the freezing chamber 12.

[0061] Furthermore, if the defrost heater 5 also closes the refrigeration damper and the freezing damper during defrosting, the heat generated by the defrost heater 5 during defrosting can be prevented from entering the refrigerating chamber 11 and the freezing chamber 12. In addition, since the temperature of the freezing chamber 12 is much lower than that of the refrigerating chamber 11, when the refrigerator is defrosting, it is necessary to more strictly control that the heat generated by defrosting cannot enter the freezing chamber 12. Therefore, the cold air damper includes a freezing air outlet damper provided at the air outlet of the freezing chamber 12 and a freezing air return damper provided at the air return port of the freezing chamber 12, and the heat of the defrost heater 5 is prevented from entering the freezing chamber 12 through two dampers.

[0062] Specifically, the controller is configured to: when it is detected that the ambient temperature is lower than a preset low temperature threshold, and the real-time refrigeration temperature and the real-time freezing temperature meet the preset compartment low temperature conditions, control the compressor to stop and close the freezing damper; start the defrost heater and obtain the real-time defrost temperature detected by the real-time defrost temperature sensor; when the real-time defrost temperature is greater than the preset defrost low temperature threshold, open the refrigeration damper.

[0063] For example, see Figure 6 , Figure 6 It is a first working flow chart of the controller provided in an embodiment of the present invention, and the controller is configured to execute steps S11 to S19.

[0064] In steps S11 to S15, since the ambient temperature is low in winter, the temperature in the cold storage room always remains low, the thermostat cannot work, and the compressor cannot start normally, which will affect the refrigeration of the refrigerator. In the embodiment of the present invention, when the refrigerator is powered on, the ambient temperature of the environment in which the refrigerator is located detected by the ambient temperature sensor is obtained. If the ambient temperature is low and lower than the low temperature threshold, it means that the refrigerator is in a low temperature operation state. The low temperature threshold can be set according to the experience value and is not specifically limited here. At this time, the real-time refrigeration temperature of the cold storage room and the real-time freezing temperature of the freezer are further monitored. If the real-time refrigeration temperature and the real-time freezing temperature both meet the low temperature condition of the compartment, it means that the temperatures of the cold storage room and the freezer are relatively low. This may be caused by the low temperature of the outdoor environment. If the cold storage room is always at a low temperature, the thermostat will not work. Therefore, whether the compressor is started or not, the compressor is controlled to stop and the freezing damper is closed. The purpose of closing the freezing damper here is to prevent the defrosting heat from entering the freezing room when the defrosting heater works later (this is because the freezing room itself needs to maintain a low temperature).

[0065] In steps S16 to S19, after the compressor stops, the defrost heater is turned on. At this time, the defrost heater is controlled to start, the evaporator is defrosted, and the defrost real-time temperature detected by the defrost real-time temperature sensor is obtained. When the defrost real-time temperature is greater than the preset defrost low temperature threshold, it means that the defrost temperature is relatively high at this time, and the heat generated by the defrost can be transferred to the refrigerated chamber. Therefore, the refrigeration damper is turned on at this time, and the freezing damper is kept in a closed state. It is worth noting that the temperature of the defrost low temperature threshold should not be too high, so as to avoid the defrost hot temperature entering the refrigerated chamber being too high, causing the refrigerated chamber to heat up too high, thereby affecting the refrigeration effect of the refrigerated chamber. In the embodiment of the present invention, the defrost low temperature threshold can be set to 3°C. Of course, this value can also be set to other empirical values.

[0066] In an embodiment of the present invention, the heat generated by the evaporator defrosting is used to compensate for the temperature of the refrigerator compartment, thereby preventing the compressor from being unable to operate normally due to the refrigerator compartment temperature being too low. At the same time, the defrosting heat can compensate for the low temperature of the refrigerator compartment, preventing the refrigerator compartment temperature from being too low and freezing the food.

[0067] Specifically, when it is detected that the ambient temperature is lower than a preset low temperature threshold, the controller is further configured to: obtain the real-time refrigeration temperature of the refrigerating chamber; when the real-time refrigeration temperature is lower than the preset refrigerating low temperature threshold and lasts for a preset time period, obtain the real-time freezing temperature of the freezing chamber; when the real-time freezing temperature is lower than the preset freezing low temperature threshold, determine that the real-time refrigeration temperature and the real-time freezing temperature meet the low temperature condition of the compartment.

[0068] For example, see Figure 7 , Figure 7is the second working flow chart of the controller provided by the embodiment of the present invention, and the step S14 specifically includes steps S141 to S146. When it is detected that the ambient temperature is lower than the low temperature threshold, the real-time refrigeration temperature of the refrigerating chamber is first obtained. When the real-time refrigeration temperature is less than the low temperature threshold (such as 3°C) and lasts for a period of time (such as 1 hour), it means that the temperature of the refrigerating chamber is too low at this time, and it is necessary to further detect the real-time freezing temperature of the freezing chamber. When the real-time freezing temperature is less than the low temperature threshold (such as -1°C), it means that the temperature of the freezing chamber is also low, and the low temperature condition of the compartment is met at this time. It is worth noting that the low temperature threshold of refrigeration and the preset time period can be set according to the empirical value. The values ​​given in the present invention are only used as examples, and other values ​​can also be used in other embodiments. In the implementation of the present invention, judging whether the freezing temperature is lower than the low temperature threshold is a protection mechanism added to prevent the freezing temperature from being too high. If the real-time freezing temperature is greater than or equal to the low temperature threshold at this time, it means that the temperature of the freezing chamber is high. If defrosting is turned on at this time, the temperature of the freezing chamber will undoubtedly be higher, which is not conducive to the storage of food in the freezing chamber. Turning on the defrost heater will inevitably cause the temperature of the freezer compartment to rise (the compressor is stopped and not refrigerating at this time, and due to the heat transfer, the freezer compartment will inevitably heat up, and the heating rate can only be slowed down by closing the freezing damper). If the defrost heater is turned on directly to compensate for the refrigeration temperature without considering the actual freezing temperature, the freezing temperature will rise too high.

[0069] In the embodiment of the present invention, by combining the opening and closing of the freezing damper and the refrigerating damper, the temperatures of the refrigerating chamber and the freezing chamber can be reasonably controlled so that the temperatures of the refrigerating chamber and the freezing chamber are kept balanced.

[0070] Specifically, the controller is further configured to: close the refrigeration damper when the real-time defrost temperature is greater than a preset defrost high temperature threshold; wherein the temperature difference between the defrost high temperature threshold and the defrost low temperature threshold is greater than a preset temperature difference threshold.

[0071] For example, see Figure 8 , Figure 8It is the third working flow chart of the controller provided by the embodiment of the present invention. After executing step S19, the controller is further configured to execute steps S21 to S23. After the refrigeration damper is opened, the heat generated by the defrosting of the evaporator will enter the refrigeration chamber through the refrigeration damper, and the temperature of the refrigeration chamber will be compensated. The temperature of the refrigeration chamber will gradually rise. This process will cause the thermostat to continue to operate. When it is detected that the temperature of the refrigeration chamber reaches the start-up temperature, the compressor will start to continue refrigeration. During the startup of the defrost heater, the real-time defrosting temperature detected by the defrost sensor is still monitored. When the real-time defrosting temperature is greater than the preset defrosting high temperature threshold (such as 6°C), it means that the heat generated by the defrosting is high at this time and is not suitable for being introduced into the refrigeration chamber, so the refrigeration damper needs to be closed. It is worth noting that the refrigeration high temperature threshold can be set according to the empirical value. The numerical value given in the present invention is only used as an example. Other numerical values ​​can also be used in other embodiments.

[0072] Specifically, the controller is further configured to: after the compressor stops, if it is detected that the real-time temperature of the refrigeration and the real-time temperature of the freezing do not meet the low temperature condition of the compartment, control the compressor to start; when it is detected that the refrigeration chamber and the freezing chamber need to be refrigerated at the same time, close the freezing damper and open the refrigeration damper; when the real-time temperature of the refrigeration reaches the shutdown temperature, close the refrigeration damper and open the freezing damper.

[0073] For example, see Fig. 9 , Fig. 9It is the fourth working flow chart of the controller provided by the embodiment of the present invention, and the controller is also configured to execute steps S31 to S39. At present, common single-system refrigerators usually have only one fan in the freezing air duct and only one damper in the refrigerating air duct. When refrigeration and freezing are required at the same time, the refrigerating damper is opened and the freezing fan rotates. At this time, the temperature difference of the evaporator will increase due to the influence of the return air of the refrigerating freezing, resulting in a lower refrigeration efficiency of the refrigeration system. Therefore, the control logic of closing the freezing damper for refrigeration alone is added. When the compressor is detected to be stopped and then started, the refrigeration conditions of the refrigerating chamber and the freezing chamber are judged. If the refrigerating chamber and the freezing chamber need to be refrigerated at the same time, the freezing damper is controlled to be closed at this time, and the refrigerating damper is opened to refrigerate the refrigerating chamber first. When the real-time temperature of the refrigerating chamber of the refrigerating chamber reaches the shutdown temperature, the compressor should continue to run. At this time, the freezing damper is opened and the refrigerating damper is closed, and only the freezing chamber is refrigerated until the freezing chamber reaches the set temperature, and the compressor stops again. Furthermore, if the freezer compartment is refrigerated alone, it means that the coldness of the refrigerator compartment is sufficient at this time, so the refrigerator damper is closed and the freezing damper is opened. If the freezing damper is not closed, the refrigeration temperature will continue to drop to below zero and the food will be frozen. If the refrigerator compartment is refrigerated alone, it means that the coldness of the freezer compartment is sufficient at this time, so the freezing damper is closed and the refrigerator damper is opened. At this time, the freezing damper is closed to prevent the coldness that should be collected in the refrigerator compartment from flowing into the freezer compartment, causing the refrigerator compartment to cool down slowly.

[0074] Compared with the prior art, the refrigerator disclosed in the present invention, by arranging a refrigerating damper and a freezing damper on the air duct connecting the evaporator and the refrigerator compartment, can further combine the temperature conditions of the refrigerating compartment and the freezing compartment in a low temperature environment to determine whether it is necessary to compensate the temperature of the refrigerating compartment. When it is necessary to compensate the temperature of the refrigerating compartment, the freezing damper is closed and the refrigerating damper is opened, and the temperature of the refrigerating compartment is compensated by the heat generated by the defrosting of the evaporator, so as to avoid the compressor from not being able to operate normally due to the excessively low temperature of the refrigerating compartment. In addition, by combining the opening and closing of the freezing damper and the refrigerating damper, the temperature of the refrigerating compartment and the freezing compartment can be reasonably controlled, so that the temperature of the refrigerating compartment and the freezing compartment is kept balanced.

[0075] See also Fig.10 , Fig.10 is a flow chart of a refrigerator control method provided by an embodiment of the present invention, the refrigerator control method is implemented by a controller in the refrigerator, the refrigerator is formed with at least one storage chamber and an air duct, the storage chamber includes at least a refrigerating chamber and a freezing chamber, and the air duct is provided with a refrigerating air door and a freezing air door; then, the refrigerator control method includes:

[0076] S1. When it is detected that the ambient temperature is lower than a preset low temperature threshold, and the real-time refrigeration temperature and the real-time freezing temperature meet the preset compartment low temperature conditions, the compressor is controlled to stop and the freezing damper is closed;

[0077] S2, start the defrost heater in the refrigerator, and obtain the defrost real-time temperature detected by the defrost real-time temperature sensor;

[0078] S3. When the real-time defrosting temperature is greater than the preset defrosting low temperature threshold, the refrigeration damper is opened.

[0079] Specifically, when it is detected that the ambient temperature is lower than a preset low temperature threshold, the method further includes: obtaining the real-time refrigeration temperature of the refrigerating chamber; when the real-time refrigeration temperature is lower than the preset refrigerating low temperature threshold and lasts for a preset time period, obtaining the real-time freezing temperature of the freezing chamber; when the real-time freezing temperature is lower than the preset freezing low temperature threshold, determining that the real-time refrigeration temperature and the real-time freezing temperature meet the low temperature condition of the compartment.

[0080] Specifically, after opening the refrigeration damper, the method further includes: when the real-time defrost temperature is greater than a preset defrost high temperature threshold, closing the refrigeration damper; wherein the temperature difference between the defrost high temperature threshold and the defrost low temperature threshold is greater than a preset temperature difference threshold.

[0081] Specifically, the method also includes: after the compressor is stopped, if it is detected that the real-time refrigeration temperature and the real-time freezing temperature do not meet the low temperature condition of the compartment, controlling the compressor to start; when it is detected that the refrigeration compartment and the freezer compartment need to be refrigerated at the same time, closing the freezing damper and opening the refrigeration damper; when the real-time refrigeration temperature reaches the shutdown temperature, closing the refrigeration damper and opening the freezing damper.

[0082] Specifically, the freezing air door includes a freezing air outlet door and a freezing air return outlet door; wherein, the freezing air outlet door is arranged in a freezing air duct connected to the freezing chamber air outlet, and the freezing air return outlet door is arranged in a freezing air duct connected to the freezing chamber air return outlet.

[0083] It is worth noting that the specific working process of the refrigerator control method described in the embodiment of the present invention can refer to the working process of the controller in the refrigerator described in the above embodiment, which will not be repeated here.

[0084] Compared with the prior art, the refrigerator control method disclosed in the present invention, by setting a refrigeration damper and a freezing damper on the air duct connecting the evaporator and the refrigerator compartment, can further combine the temperature conditions of the refrigeration compartment and the freezer compartment in a low temperature environment to determine whether it is necessary to compensate the temperature of the refrigeration compartment. When it is necessary to compensate the temperature of the refrigeration compartment, the freezing damper is closed and the refrigeration damper is opened, and the temperature of the refrigeration compartment is compensated by the heat generated by the defrosting of the evaporator, so as to avoid the compressor from not being able to operate normally due to the low temperature of the refrigeration compartment. In addition, by combining the opening and closing of the freezing damper and the refrigeration damper, the temperature of the refrigeration compartment and the freezer compartment can be reasonably controlled, so that the temperature of the refrigeration compartment and the freezer compartment is kept balanced.

[0085] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A refrigerator, characterized in that: include: A box body, in which at least one storage chamber and an air duct are formed, the storage chamber at least includes a refrigerating chamber and a freezing chamber, and the air duct is provided with a refrigerating air door and a freezing air door; A refrigeration system, arranged in the box, for providing cold air to the storage room, the refrigeration system comprising a compressor, an evaporator and a condenser connected by pipelines; A defrost heater, disposed in the box, for defrosting the evaporator; A defrost real-time temperature sensor is provided on one side of the defrost heater and is used to detect the defrost real-time temperature; The controller is configured as: When it is detected that the ambient temperature is lower than a preset low temperature threshold, and the real-time refrigeration temperature and the real-time freezing temperature meet the preset compartment low temperature conditions, the compressor is controlled to stop and the freezing damper is closed; Starting the defrost heater and obtaining the defrost real-time temperature detected by the defrost real-time temperature sensor; When the real-time defrosting temperature is greater than a preset defrosting low temperature threshold, the refrigeration damper is opened.

2. The refrigerator according to claim 1, characterized in that: When it is detected that the ambient temperature is lower than a preset low temperature threshold, the controller is further configured to: Obtaining the real-time refrigeration temperature of the refrigeration chamber; When the real-time refrigeration temperature is lower than the preset low-temperature refrigeration threshold value and lasts for a preset period of time, obtaining the real-time freezing temperature of the freezing chamber; When the real-time freezing temperature is less than a preset freezing low temperature threshold, it is determined that the real-time refrigeration temperature and the real-time freezing temperature meet the compartment low temperature condition.

3. The refrigerator according to claim 1, characterized in that: After the refrigeration damper is opened, the controller is further configured to: When the real-time defrost temperature is greater than a preset defrost high temperature threshold, the refrigeration damper is closed; wherein the temperature difference between the defrost high temperature threshold and the defrost low temperature threshold is greater than a preset temperature difference threshold.

4. The refrigerator according to claim 1, characterized in that: The controller is also configured to: After the compressor is stopped, if it is detected that the real-time refrigeration temperature and the real-time freezing temperature do not meet the low temperature condition of the compartment, the compressor is controlled to start; When it is detected that the refrigerating chamber and the freezing chamber need to be refrigerated at the same time, the freezing damper is closed and the refrigerating damper is opened; When the real refrigeration temperature reaches the shutdown temperature, the refrigeration damper is closed and the freezing damper is opened.

5. The refrigerator according to claim 1, characterized in that: The freezing air door includes a freezing air outlet door and a freezing air return door; wherein, the freezing air outlet door is arranged in a freezing air duct connected to the freezing chamber air outlet, and the freezing air return door is arranged in a freezing air duct connected to the freezing chamber air return door.

6. A refrigerator control method, characterized in that: The refrigerator is formed with at least one storage chamber and an air duct, the storage chamber includes at least a refrigerating chamber and a freezing chamber, and the air duct is provided with a refrigerating air door and a freezing air door; then, the refrigerator control method includes: When it is detected that the ambient temperature is lower than the preset low temperature threshold, and the real-time refrigeration temperature and the real-time freezing temperature meet the preset compartment low temperature conditions, the compressor is controlled to stop and the freezing damper is closed; Start the defrost heater in the refrigerator and obtain the defrost real-time temperature detected by the defrost real-time temperature sensor; When the real-time defrosting temperature is greater than the preset defrosting low temperature threshold, the refrigeration damper is opened.

7. The refrigerator control method according to claim 6, characterized in that: When it is detected that the ambient temperature is lower than a preset low temperature threshold, the method further includes: Obtaining the real-time refrigeration temperature of the refrigeration chamber; When the real-time refrigeration temperature is lower than the preset low-temperature refrigeration threshold value and lasts for a preset period of time, obtaining the real-time freezing temperature of the freezing chamber; When the real-time freezing temperature is less than a preset freezing low temperature threshold, it is determined that the real-time refrigeration temperature and the real-time freezing temperature meet the compartment low temperature condition.

8. The refrigerator control method according to claim 6, characterized in that: After opening the refrigeration damper, the method further includes: When the real-time defrost temperature is greater than a preset defrost high temperature threshold, the refrigeration damper is closed; wherein the temperature difference between the defrost high temperature threshold and the defrost low temperature threshold is greater than a preset temperature difference threshold.

9. The refrigerator control method according to claim 6, characterized in that: The method further comprises: After the compressor is stopped, if it is detected that the real-time refrigeration temperature and the real-time freezing temperature do not meet the low temperature condition of the compartment, the compressor is controlled to start; When it is detected that the refrigerating chamber and the freezing chamber need to be refrigerated at the same time, the freezing damper is closed and the refrigerating damper is opened; When the real refrigeration temperature reaches the shutdown temperature, the refrigeration damper is closed and the freezing damper is opened.

10. The refrigerator control method according to claim 6, characterized in that: The freezing air door includes a freezing air outlet door and a freezing air return door; wherein, the freezing air outlet door is arranged in a freezing air duct connected to the freezing chamber air outlet, and the freezing air return door is arranged in a freezing air duct connected to the freezing chamber air return door.

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