Refrigerator and control method thereof

Abstract

According to the refrigerator and the control method thereof, an air supply fan is arranged at the communicating position of an air return duct and an air supply duct, the air supply fan rotates reversely when the refrigerator starts defrosting, the air is blown from the air supply duct to the air return duct at the moment, and therefore hot air generated when a heater heats an evaporator cannot be blown to a storage chamber; and the refrigeration effect of the storage chamber in the defrosting stage is ensured. Besides, the air supply duct and the air return duct are each internally provided with a pressure sensor, whether the pressure is balanced or not is determined by detecting the pressure difference of the two air ducts, when the pressure difference is large, it is indicated that the pressure of the air return duct is large due to heating of the heater, at the moment, the pressure difference between the two air ducts is large, and therefore the reverse rotation speed needs to be increased; according to the embodiment, the reverse rotation speed of the air supply fan is adjusted according to the pressure difference, electric energy is saved, meanwhile, hot air generated when the heater heats the evaporator can be prevented from being blown to the storage chamber, and the refrigeration effect of the storage chamber in the defrosting stage is guaranteed.

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] After the refrigerator has been refrigerated for a period of time, frost will form on the surface of the evaporator. If defrosting is not performed, the frost will become thicker and thicker, and the fin evaporator will be filled with frost and the air duct will be blocked, resulting in the inability of cold air to circulate and the reduction of refrigeration effect. When the refrigerator enters the defrosting stage, the power supply of the compressor will be automatically cut off and the heater will be turned on. The heater heats the evaporator to melt the frost. Most refrigerators on the market now reduce the impact of the heat generated by the heater on the compartment temperature by optimizing the defrosting time or optimizing the temperature control strategy. However, the return air duct and the supply air duct are connected together through the guide port. During the defrosting process, the pressure difference and temperature difference between the air on both sides of the guide port cause heat exchange of the air, which will inevitably transfer heat to the compartment, causing the compartment temperature to rise, which is not conducive to food preservation. 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 suppress the heat transfer into the compartment during defrosting, prevent the compartment temperature from fluctuating, and improve the freshness preservation performance of the refrigerator.

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

[0005] A box body, in which a storage chamber and an air duct are formed; wherein the air duct includes a return air duct and a supply air duct, an evaporator and a heater are arranged in the return air duct, the supply air duct is communicated with the return air duct and the storage chamber respectively, and an air supply fan is arranged at the connection point between the supply air duct and the return air duct;

[0006] A door, used for opening and closing the storage room;

[0007] A first pressure sensor is disposed in the air supply duct;

[0008] A second pressure sensor is provided in the return air duct;

[0009] The controller is configured as:

[0010] In response to starting a heating operation of the heater, acquiring a first pressure value detected by the first pressure sensor, and acquiring a second pressure value detected by the second pressure sensor;

[0011] Calculating a pressure difference between the first pressure value and the second pressure value, and acquiring a corresponding reverse rotation speed according to the pressure difference;

[0012] The air supply fan is controlled to turn from the air supply duct to the air return duct, and to operate at the reverse rotation speed.

[0013] As an improvement of the above solution, at least one air outlet is provided in the storage chamber, each of the air outlets is communicated with the air supply duct, and the first pressure sensor and the second pressure sensor are both arranged opposite to the air supply fan.

[0014] As an improvement of the above solution, the step of obtaining the corresponding reverse rotation speed according to the pressure difference includes:

[0015] According to the pressure difference value, a corresponding target pressure difference range is found in a plurality of preset pressure difference ranges; wherein each of the pressure difference ranges corresponds to a reverse rotation speed of the air supply fan, and the pressure difference value is proportional to the reverse rotation speed;

[0016] The corresponding reverse rotation speed is acquired according to the target pressure difference range.

[0017] As an improvement of the above solution, the controller is further configured as follows:

[0018] When it is detected that the heater stops heating, the air supply fan continues to be controlled to blow from the air supply duct to the return air duct, and operates at the reverse rotation speed.

[0019] As an improvement of the above solution, after the heater stops heating, the controller is further configured to:

[0020] When it is detected that the pressure difference is less than or equal to the preset minimum pressure difference threshold, the air supply fan is controlled to blow from the return air duct to the supply air duct and run at a preset forward rotation speed.

[0021] To achieve the above-mentioned object, an embodiment of the present invention further provides a refrigerator control method, wherein a storage chamber and an air duct are provided in the refrigerator, wherein the air duct includes a return air duct and a supply air duct, wherein an evaporator and a heater are provided in the return air duct, wherein the supply air duct is communicated with the return air duct and the storage chamber respectively, and an air supply fan is provided at the connection point between the supply air duct and the return air duct; wherein the refrigerator further includes a first pressure sensor provided in the supply air duct, and a second pressure sensor provided in the return air duct; then, the refrigerator control method includes:

[0022] In response to starting a heating operation of the heater, acquiring a first pressure value detected by the first pressure sensor, and acquiring a second pressure value detected by the second pressure sensor;

[0023] Calculating a pressure difference between the first pressure value and the second pressure value, and acquiring a corresponding reverse rotation speed according to the pressure difference;

[0024] The air supply fan is controlled to turn from the air supply duct to the air return duct, and to operate at the reverse rotation speed.

[0025] As an improvement of the above solution, at least one air outlet is provided in the storage chamber, each of the air outlets is communicated with the air supply duct, and the first pressure sensor and the second pressure sensor are both arranged opposite to the air supply fan.

[0026] As an improvement of the above solution, the step of obtaining the corresponding reverse rotation speed according to the pressure difference includes:

[0027] According to the pressure difference value, a corresponding target pressure difference range is found in a plurality of preset pressure difference ranges; wherein each of the pressure difference ranges corresponds to a reverse rotation speed of the air supply fan, and the pressure difference value is proportional to the reverse rotation speed;

[0028] The corresponding reverse rotation speed is acquired according to the target pressure difference range.

[0029] As an improvement of the above solution, the method further includes:

[0030] When it is detected that the heater stops heating, the air supply fan continues to be controlled to blow from the air supply duct to the return air duct, and operates at the reverse rotation speed.

[0031] As an improvement of the above solution, after the heater stops heating, the method further includes:

[0032] When it is detected that the pressure difference is less than or equal to the preset minimum pressure difference threshold, the air supply fan is controlled to blow from the return air duct to the supply air duct and run at a preset forward rotation speed.

[0033] Compared with the prior art, the refrigerator and control method thereof disclosed in the present invention, by setting the supply air fan at the connection point between the return air duct and the supply air duct, the supply air fan is reversed when the refrigerator starts to defrost. At this time, the wind direction is from the supply air duct to the return air duct, so that the hot air generated by the heater heating the evaporator will not be blown to the storage room, ensuring the refrigeration effect of the storage room during the defrosting stage. In addition, by setting a pressure sensor in each of the supply air duct and the return air duct, the pressure difference between the two air ducts is detected to determine whether the pressure is balanced. When there is a large pressure difference, it means that the pressure in the return air duct is large due to the heating of the heater. At this time, the pressure difference between the two air ducts is large, so it is necessary to increase the reversal speed. In the embodiment of the present invention, the reversal speed of the supply air fan is adjusted according to the pressure difference, which saves electric energy while avoiding the hot air generated by the heater heating the evaporator to be blown to the storage room, ensuring the refrigeration effect of the storage room during the defrosting stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of a refrigeration system in a refrigerator provided by an embodiment of the present invention;

[0037] Figure 4 is a schematic structural diagram of an air duct in a refrigerator provided by an embodiment of the present invention;

[0038] Figure 5 is a first working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0039] Figure 6 is a second working flow chart of the controller in the refrigerator provided by an embodiment of the present invention;

[0040] Figure 7 is a third working flow diagram of the controller in the refrigerator provided by an embodiment of the present invention;

[0041] Figure 8 is a fourth working flow diagram of a controller in a refrigerator provided by an embodiment of the present invention;

[0042] Fig. 9 is a complete working flow chart of a controller in a refrigerator provided by an embodiment of the present invention;

[0043] Fig.10 It is a flow chart of a refrigerator control method provided by an embodiment of the present invention.

[0044] Among them, 100, refrigerator; 101, light preservation module; 102, automatic lifting shelf; 103, lifting device; 13, compressor; 14, condenser; 15, capillary tube; 1, air supply fan; 2, second pressure sensor; 3, first pressure sensor; 4, evaporator; 5, heater; 6, return air duct; 7, supply air duct; 8, air guide port; 9-10, air outlet; 11, return air port; 12, storage room. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] See also Figure 1 , Figure 1 It is a schematic diagram of the external structure of a refrigerator 100 provided in an embodiment of the present invention. The refrigerator 100 of this embodiment 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 outer 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 outer 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 compressor cabin, etc., and also includes a storage space for storing food, etc. See Figure 2 , Figure 2: 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, for example, Figure 1 The upper storage room is provided with a double-opening door body. 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 achieve drawer-like storage. The refrigerator door is provided with a display screen, which is used to display prompt information and receive user touch operations.

[0051] 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 13, an evaporator 4, a drying filter (not shown in the figure), a capillary tube 15, a condenser 14 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. Among them, the compression process is: plug in the power cord of the refrigerator, when the contacts of the thermostat are connected, the compressor 13 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor 13, and is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 13 and then discharged into the condenser 14; the condensation process is: the high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 14, 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 condensed refrigerant saturated liquid is filtered through a drying filter to remove moisture and impurities and then flows into the capillary 15, through which throttling and pressure reduction are performed, 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 4, which not only reduces the temperature of the evaporator 4 and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 4 passes through the gas-liquid separator and returns to the compressor 13 again, and the above process is repeated to transfer the heat in the refrigerator to the air outside the box, thereby achieving the purpose of refrigeration.

[0052] See also Figure 4 , Figure 4It is a structural schematic diagram of the air duct in the refrigerator 100 provided in an embodiment of the present invention, the air duct includes a return air duct 6 and a supply air duct 7, at least one air outlet (such as air outlet 9 and air outlet 10) is provided in the storage chamber 12, each of the air outlets is connected to the supply air duct 7, an evaporator 4 and a heater 5 are provided in the return air duct 6, the supply air duct 7 is respectively connected to the return air duct 6 and the storage chamber 12, the connecting point between the supply air duct 7 and the return air duct 6 is an air guide port 8, and an air supply fan 1 is provided on the air guide port 8. During the refrigeration process of the refrigerator, the heater 5 is turned off, the evaporator 4 is running, and the cold air in the storage chamber 12 flows back to the evaporator 4 through the return air port 11 for heat exchange. The cold air after the heat exchange in the evaporator 4 flows from the return air duct 6 to the supply air duct 7 under the action of the air supply fan 1, and then flows to the storage chamber 12 through the air outlet 9 and the air outlet 10, completing the refrigeration process of the refrigerator.

[0053] In an embodiment of the present invention, the refrigerator also includes a first pressure sensor 3 and a second pressure sensor 2, wherein the first pressure sensor is arranged in the supply air duct 7, and the second pressure sensor 2 is arranged in the return air duct 6, and the first pressure sensor 3 and the second pressure sensor 2 are both arranged relative to the supply air fan 1.

[0054] Specifically, the controller is configured to: in response to the start of the heating operation of the heater, obtain a first pressure value detected by the first pressure sensor, and obtain a second pressure value detected by the second pressure sensor; calculate the pressure difference between the first pressure value and the second pressure value, and obtain the corresponding reverse speed based on the pressure difference; control the direction of the supply air fan to blow from the supply air duct to the return air duct, and operate at the reverse speed.

[0055] For example, see Figure 5 , Figure 5 is the first working flow chart of the controller in the refrigerator provided in an embodiment of the present invention, and the controller is configured to execute steps S11 to S15. When the refrigerator 100 enters the defrosting program, the heater 5 starts to heat. At this time, since the frost layer on the evaporator 4 begins to melt under the action of the heater 5, the generated hot air will flow to the air supply duct 7 through the air guide port 8 (the air supply fan remains stationary), and then flow into the storage chamber 12 through the air outlet 9-10, causing the temperature of the storage chamber 12 to rise. In order to overcome this phenomenon, in an embodiment of the present invention, after the heater 5 is started, the air supply fan 1 is started and the air supply fan 1 is controlled to reverse to avoid the transmission of hot air into the storage chamber 12.

[0056] Exemplarily, when the heater 5 receives a defrost signal, it starts to heat, and defrosting begins. In a fixed volume of the return air duct 6, the temperature rises and the pressure also increases accordingly. A pressure difference ΔP is generated before and after the supply air fan 1. By detecting the first pressure value P1 detected by the first pressure sensor 3 and the second pressure value P2 detected by the second pressure sensor 2, the pressure difference ΔP between the first pressure value P1 and the second pressure value P2 is calculated, where ΔP = |P1 - P2|. During the entire defrosting process, the temperature at the top of the evaporator 4 can rise from -22°C to 15°C, and the pressure at the second pressure sensor 2 rises from the initial P0 to nP0 (n is a multiple). By judging the magnitude of the pressure difference before and after the supply air fan 1 to control the reverse rotation speed of the supply air fan, the rotation speed of the supply air fan 1 can be reasonably controlled, saving the electrical energy of the fan and preventing the hot air in the return air duct 6 from entering the supply air duct 7 through heat transfer, maintaining the temperature stability of the supply air duct 7 and the storage chamber 12.

[0057] Specifically, obtaining the corresponding reverse rotation speed according to the pressure difference includes: finding the corresponding target pressure difference range according to the pressure difference within a plurality of preset pressure difference ranges; wherein, each pressure difference range corresponds to a reverse rotation speed of the supply air fan, and the pressure difference is in a direct proportion relationship with the reverse rotation speed; obtaining the corresponding reverse rotation speed according to the target pressure difference range.

[0058] Exemplarily, referring to Figure 6 , Figure 6 is the second working flow chart of the controller in the refrigerator provided by the embodiment of the present invention, and the step S14 includes steps S141 to S142. The pressure ranges include ΔP ≤ a, a < ΔP ≤ b, b < ΔP ≤ c, c < ΔP ≤ d, ΔP > d, where a < b < c < d, and the values of a, b, c, and d are all set values, which can be set by the manufacturer itself and are not specifically limited here. When the pressure range is ΔP ≤ a, the reverse rotation speed is N1; when the pressure range is a < ΔP ≤ b, the reverse rotation speed is N2; when the pressure range is b < ΔP ≤ c, the reverse rotation speed is N3; when the pressure range is c < ΔP ≤ d, the reverse rotation speed is N4; when the pressure range is ΔP > d, the reverse rotation speed is N5; where N5 > N4 > N3 > N2 > N1, and the values of N1 to N5 are all set values, which can be set by the manufacturer itself and are not specifically limited here. For example, after the heater is started and the detected target pressure range corresponding to ΔP is a < ΔP ≤ b, at this time, the corresponding reverse rotation speed of the supply air fan is N2, then control the supply air fan to rotate reversely at the speed N2. When the detected value of ΔP falls into other pressure ranges, replace the corresponding speed.

[0059] Specifically, the controller is further configured to: when it is detected that the heater stops heating, continue to control the direction of the air supply fan to blow from the air supply duct to the return air duct, and operate at the reverse rotation speed.

[0060] For example, see Figure 7 , Figure 7 It is the third working flow chart of the controller in the refrigerator provided by the embodiment of the present invention. After executing step S15, the controller is also used to execute steps S16 to S21. When the heater switches from the heating state to the stop heating state, since the evaporator still has residual heat, the air supply fan is still controlled to reversely operate according to the above-mentioned fan control method, but at this time it is necessary to evaluate whether the pressure difference is less than or equal to the preset minimum pressure difference threshold, which is a. After the defrost sensor sends a defrost end signal, the heater 5 stops heating, the compressor starts working, the temperature of the evaporator 4 decreases, the pressure in the return air duct 6 decreases, the pressure difference ΔP decreases, and the fan reverses at a corresponding speed according to the size of the pressure difference. When ΔP>d, the reverse speed is N5; when c<ΔP≤d, the reverse speed is N4; when b<ΔP≤c, the reverse speed is N3; when a<ΔP≤b, the reverse speed is N2.

[0061] Specifically, after the heater stops heating, the controller is also configured to: when it is detected that the pressure difference is less than or equal to a preset minimum pressure difference threshold, control the direction of the supply air fan to blow from the return air duct to the supply air duct, and operate at a preset forward speed.

[0062] For example, see Figure 8 , Figure 8 This is a fourth working flow diagram of the controller in the refrigerator provided by an embodiment of the present invention, and the controller is further configured to execute step S22. When ΔP≤a, the air supply fan resumes forward rotation and delivers the evaporator temperature to the storage chamber 12 at a preset forward rotation speed, and the control method ends.

[0063] Further, see Fig. 9 , Fig. 9 It is a complete working flow chart of the controller in the refrigerator provided by the embodiment of the present invention.

[0064] Compared with the prior art, the refrigerator disclosed in the present invention sets the air supply fan at the connection point between the return air duct and the air supply duct, and reverses the air supply fan when the refrigerator starts to defrost. At this time, the wind direction is from the air supply duct to the return air duct, so that the hot air generated by the heater heating the evaporator will not be blown to the storage room, ensuring the refrigeration effect of the storage room during the defrosting stage. In addition, by setting a pressure sensor in each of the air supply duct and the return air duct, the pressure difference between the two ducts is detected to determine whether the pressure is balanced. When there is a large pressure difference, it means that the pressure in the return air duct is large due to the heating of the heater. At this time, the pressure difference between the two ducts is large, so it is necessary to increase the reversal speed. In the embodiment of the present invention, the reversal speed of the air supply fan is adjusted according to the pressure difference, which saves electric energy while avoiding the hot air generated by the heater heating the evaporator to be blown to the storage room, ensuring the refrigeration effect of the storage room during the defrosting stage.

[0065] See also Fig.10 , Fig.10 : is a flowchart of a refrigerator control method provided by an embodiment of the present invention. The refrigerator control method according to the embodiment of the present invention is implemented by a controller in a refrigerator. The refrigerator is provided with a storage chamber and an air duct. The air duct includes a return air duct and a supply air duct. An evaporator and a heater are provided in the return air duct. The supply air duct is connected to the return air duct and the storage chamber respectively. A supply air fan is provided at the connection between the supply air duct and the return air duct. The refrigerator also includes a first pressure sensor provided in the supply air duct and a second pressure sensor provided in the return air duct. Then, the refrigerator control method includes:

[0066] S1, in response to the heater starting a heating operation, obtaining a first pressure value detected by the first pressure sensor, and obtaining a second pressure value detected by the second pressure sensor;

[0067] S2, calculating the pressure difference between the first pressure value and the second pressure value, and obtaining the corresponding reverse rotation speed according to the pressure difference;

[0068] S3. Control the direction of the air supply fan to blow from the air supply duct to the return air duct, and operate at the reverse rotation speed.

[0069] Specifically, at least one air outlet is provided in the storage chamber, each of the air outlets is communicated with the air supply duct, and the first pressure sensor and the second pressure sensor are both arranged opposite to the air supply fan.

[0070] Specifically, obtaining the corresponding reversal speed according to the pressure difference value includes: searching for a corresponding target pressure difference range within a plurality of preset pressure difference ranges according to the pressure difference value; wherein each of the pressure difference ranges corresponds to a reversal speed of the air supply fan, and the pressure difference value is directly proportional to the reversal speed; and obtaining the corresponding reversal speed according to the target pressure difference range.

[0071] Specifically, the method further includes: when it is detected that the heater stops heating, continuing to control the direction of the air supply fan to blow from the air supply duct to the return air duct, and operating at the reverse rotation speed.

[0072] Specifically, after the heater stops heating, the method further includes: when it is detected that the pressure difference is less than or equal to a preset minimum pressure difference threshold, controlling the direction of the air supply fan to blow from the return air duct to the supply air duct, and running at a preset forward speed.

[0073] It is worth noting that the working process of the refrigerator control method described in the embodiment of the present invention can refer to the working process diagram of the controller in the refrigerator described in the above embodiment, which will not be repeated here.

[0074] Compared with the prior art, the refrigerator control method disclosed in the present invention sets the supply air fan at the connection point between the return air duct and the supply air duct, and reverses the supply air fan when the refrigerator starts to defrost. At this time, the wind direction is from the supply air duct to the return air duct, so that the hot air generated by the heater heating the evaporator will not be blown to the storage room, ensuring the refrigeration effect of the storage room during the defrosting stage. In addition, by setting a pressure sensor in each of the supply air duct and the return air duct, the pressure difference between the two air ducts is detected to determine whether the pressure is balanced. When there is a large pressure difference, it means that the pressure in the return air duct is large due to the heating of the heater. At this time, the pressure difference between the two air ducts is large, so it is necessary to increase the reversal speed. In the embodiment of the present invention, the reversal speed of the supply air fan is adjusted according to the pressure difference, which saves electric energy while avoiding the hot air generated by the heater heating the evaporator to be blown to the storage room, ensuring the refrigeration effect of the storage room during the defrosting stage.

[0075] 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 a storage chamber and an air duct are formed; wherein the air duct includes a return air duct and a supply air duct, an evaporator and a heater are arranged in the return air duct, the supply air duct is communicated with the return air duct and the storage chamber respectively, and an air supply fan is arranged at the connection point between the supply air duct and the return air duct; A door, used for opening and closing the storage chamber; A first pressure sensor is disposed in the air supply duct; A second pressure sensor is provided in the return air duct; The controller is configured as: In response to starting a heating operation of the heater, acquiring a first pressure value detected by the first pressure sensor, and acquiring a second pressure value detected by the second pressure sensor; Calculating a pressure difference between the first pressure value and the second pressure value, and acquiring a corresponding reverse rotation speed according to the pressure difference; The air supply fan is controlled to turn from the air supply duct to the air return duct, and to operate at the reverse rotation speed.

2. The refrigerator according to claim 1, characterized in that: At least one air outlet is provided in the storage chamber, each of the air outlets is communicated with the air supply duct, and the first pressure sensor and the second pressure sensor are both arranged opposite to the air supply fan.

3. The refrigerator according to claim 1, characterized in that: The step of obtaining a corresponding reverse rotation speed according to the pressure difference comprises: According to the pressure difference value, a corresponding target pressure difference range is found in a plurality of preset pressure difference ranges; wherein each of the pressure difference ranges corresponds to a reverse rotation speed of the air supply fan, and the pressure difference value is proportional to the reverse rotation speed; The corresponding reverse rotation speed is acquired according to the target pressure difference range.

4. The refrigerator according to claim 1, characterized in that: The controller is also configured to: When it is detected that the heater stops heating, the air supply fan continues to be controlled to blow from the air supply duct to the return air duct, and operates at the reverse rotation speed.

5. The refrigerator according to claim 4, characterized in that: After the heater stops heating, the controller is further configured to: When it is detected that the pressure difference is less than or equal to the preset minimum pressure difference threshold, the air supply fan is controlled to blow from the return air duct to the supply air duct and run at a preset forward rotation speed.

6. A refrigerator control method, characterized in that: A storage chamber and an air duct are provided in the refrigerator, wherein the air duct includes a return air duct and a supply air duct, wherein an evaporator and a heater are provided in the return air duct, wherein the supply air duct is communicated with the return air duct and the storage chamber respectively, and an air supply fan is provided at the connection point between the supply air duct and the return air duct; wherein the refrigerator further includes a first pressure sensor provided in the supply air duct, and a second pressure sensor provided in the return air duct; wherein the refrigerator control method includes: In response to starting a heating operation of the heater, acquiring a first pressure value detected by the first pressure sensor, and acquiring a second pressure value detected by the second pressure sensor; Calculating a pressure difference between the first pressure value and the second pressure value, and acquiring a corresponding reverse rotation speed according to the pressure difference; The air supply fan is controlled to turn from the air supply duct to the air return duct, and to operate at the reverse rotation speed.

7. The refrigerator control method according to claim 6, characterized in that: At least one air outlet is provided in the storage chamber, each of the air outlets is communicated with the air supply duct, and the first pressure sensor and the second pressure sensor are both arranged opposite to the air supply fan.

8. The refrigerator control method according to claim 6, characterized in that: The step of obtaining a corresponding reverse rotation speed according to the pressure difference comprises: According to the pressure difference value, a corresponding target pressure difference range is found in a plurality of preset pressure difference ranges; wherein each of the pressure difference ranges corresponds to a reverse rotation speed of the air supply fan, and the pressure difference value is proportional to the reverse rotation speed; The corresponding reverse rotation speed is acquired according to the target pressure difference range.

9. The refrigerator control method according to claim 6, characterized in that: The method further comprises: When it is detected that the heater stops heating, the air supply fan continues to be controlled to blow from the air supply duct to the return air duct, and operates at the reverse rotation speed.

10. The refrigerator control method according to claim 9, characterized in that: After the heater stops heating, the method further includes: When it is detected that the pressure difference is less than or equal to the preset minimum pressure difference threshold, the air supply fan is controlled to blow from the return air duct to the supply air duct and run at a preset forward rotation speed.

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