Refrigerator

Abstract

A heating module and a frost temperature sensor are arranged at the position of an electric air door, the temperature of the electric air door is detected through the frost temperature sensor, when the temperature is too low, it can be judged that the electric air door has the freezing / frosting risk, at the moment, the heating module is started, and heat generated by the heating module is used for unfreezing the electric air door. Therefore, the electric air door can be normally used, and the chamber is prevented from being overheated or overcooled.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerators, in particular to a refrigerator. Background Art

[0002] With the popularity of air-cooled frost-free refrigerators, electric dampers have begun to be used in large quantities. Their main function is to control the cold air entering the compartment (refrigerator) by opening and closing the damper door panels, thereby controlling the temperature of the compartment. The electric damper is installed in the air duct between the refrigerator and the freezer. The electric damper handles sub-zero temperatures for a long time, and the risk of freezing is relatively high. Once the electric damper freezes, it will cause the compartment to be unable to supply air or continue to supply air, resulting in overheating or overcooling of the compartment. Summary of the invention

[0003] The purpose of the embodiment of the utility model is to provide a refrigerator, in which a heating module is arranged at the electric damper, and the electric damper is thawed by the heating module so that the electric damper can be used normally to avoid overheating or overcooling of the compartment.

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

[0005] A box body, in which a refrigerating chamber and a freezing chamber are formed, as well as a refrigerating air supply duct connected to the refrigerating chamber and a freezing air supply duct connected to the freezing chamber;

[0006] An electric damper is arranged in the refrigerated air supply duct. When the electric damper is closed, the refrigerated air supply duct stops supplying air. When the electric damper is opened, the refrigerated air supply duct supplies air.

[0007] A driving module, electrically connected to the electric damper, and used to drive the electric damper to open and close;

[0008] A heating module is arranged in the refrigerated air supply duct, and the distance between the heating module and the electric damper is less than a preset first distance threshold;

[0009] A frost temperature sensor is disposed in the refrigerated air supply duct, and the distance between the frost temperature sensor and the electric damper is less than a preset second distance threshold;

[0010] The controller is electrically connected to the driving module, the heating module and the frost temperature sensor respectively.

[0011] As an improvement of the above solution, the refrigerator further includes:

[0012] A power supply module is respectively connected to the controller, the driving module, the heating module and the frost temperature sensor, and a power supply converter is provided in the power supply module.

[0013] As an improvement of the above solution, the refrigerator further includes:

[0014] A freezing temperature sensor is arranged in the freezing chamber;

[0015] A refrigeration temperature sensor is arranged in the refrigeration chamber;

[0016] Wherein, the controller is connected to the refrigeration temperature sensor and the freezing temperature sensor via a first interface.

[0017] As an improvement of the above solution, a first resistor, a second resistor, a third resistor, a fourth resistor, a second capacitor and a third capacitor are provided between the controller and the first interface; wherein,

[0018] The first end of the first interface is respectively connected to the freezing temperature sensor, the first resistor and the third resistor, the first resistor is also respectively connected to the controller and the second capacitor, and the other end of the second capacitor is grounded;

[0019] The second end of the first interface is respectively connected to the refrigeration temperature sensor, the second resistor and the fourth resistor, the second resistor is also respectively connected to the controller and the third capacitor, and the other end of the third capacitor is grounded;

[0020] The third end of the first interface is grounded.

[0021] As an improvement of the above solution, the heating module includes a switch circuit and a heating wire, and the switch circuit is connected to the controller and the heating wire respectively; wherein,

[0022] The switch circuit includes a transistor and a fifth resistor, the base of the transistor is connected to the controller, the collector of the transistor is connected to the fifth resistor, the emitter of the transistor is grounded, and the fifth resistor is also connected to the heating wire.

[0023] As an improvement of the above solution, the transistor is an NPN transistor.

[0024] As an improvement of the above solution, the driving module includes a driving chip, a first filtering module and a second filtering module; wherein the driving chip is respectively connected to the controller, the first filtering module and the second filtering module, and the driving chip is also connected to the electric damper through a second interface.

[0025] As an improvement of the above solution, the frost temperature sensor includes a sensor chip and an electrode sheet, the sensor chip is connected to the controller and the electrode sheet respectively, and the electrode sheet is provided with a positive electrode and a negative electrode.

[0026] Compared with the prior art, the refrigerator disclosed by the utility model is provided with a heating module and a frost temperature sensor at the electric damper. The temperature of the electric damper is detected by the frost temperature sensor. When the temperature is too low, it can be determined that there is a risk of ice / frost on the electric damper. At this time, the heating module is started, and the heat generated by the heating module is used to defrost the electric damper, so that the electric damper can be used normally to avoid overheating or overcooling in the compartment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the external structure of a refrigerator provided by an embodiment of the utility model;

[0028] Figure 2 This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the utility model;

[0029] Figure 3 It is a structural schematic diagram of a refrigeration system in a refrigerator provided by an embodiment of the utility model;

[0030] Figure 4 It is a structural schematic diagram of a compressor cabin provided by an embodiment of the utility model;

[0031] Figure 5 It is a connection diagram of a controller and a plurality of sensors provided in an embodiment of the utility model;

[0032] Figure 6 This is a flowchart of the controller for starting the heating module provided by the embodiment of the utility model;

[0033] Figure 7 is a circuit diagram of a power module provided by an embodiment of the utility model;

[0034] Figure 8 This is a schematic diagram of the chip pins of the controller provided in the embodiment of the utility model;

[0035] Fig. 9 is a circuit diagram between the controller and the first interface provided by an embodiment of the utility model;

[0036] Fig.10 It is a circuit diagram of a driving module, a heating module and a second interface provided by an embodiment of the utility model;

[0037] Fig.11 It is a circuit diagram of a frost temperature sensor provided in an embodiment of the utility model.

[0038] Among them, 100, refrigerator; 10A, compressor cabin; 1, compressor; 2, evaporator; 3, capillary tube; 4, condenser; 5, bottom cooling fan; 6, evaporating dish. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] See also Figure 1 , Figure 1 It is a schematic diagram of the external structure of a refrigerator 100 provided by an embodiment of the utility model. The refrigerator 100 of this embodiment is approximately rectangular in shape. 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 outside the box body, a door body liner located inside the box body, an upper end cover, a lower end cover, and an insulation layer located between the door body shell, the door body liner, the upper end cover, and the lower end cover; usually, the insulation 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.

[0044] See also Figure 2 , Figure 2This is a schematic diagram of the internal structure of a refrigerator provided by an embodiment of the utility model. 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, such as Figure 2 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.

[0045] 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 utility model, 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. Among them, 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.

[0046] See also Figure 4 , Figure 41 is a schematic diagram of the structure of a compressor cabin 10A provided by an embodiment of the utility model, wherein a compressor 1, a condenser 4, a bottom cooling fan 5 and an evaporation dish 6 are arranged in the compressor cabin 10A, and the evaporation dish 6 is used to receive defrost water. Specifically, the evaporation dish 6 is used to receive defrost water in the freezing chamber and / or defrost water when the evaporator 2 is defrosted. The evaporation dish 6 is fixed on the bottom wall of the compressor cabin 10A, and the evaporation dish 6 is a box-shaped structure with an open top. The evaporation dish 6 includes a horizontally arranged bottom plate and side plates protruding upward from the edges of the bottom plate; the side plates are arranged circumferentially and enclosed with each other, and the bottom plate is enclosed on the edges of the side plates to form a box-shaped structure with an open top. The condenser 4 is arranged vertically, and the top end of the condenser 4 is against the top surface of the compressor cabin 10A, so that the compressor cabin 10A has a smaller height on the basis of ensuring that the condenser 4 can be installed in the compressor cabin 10A, thereby ensuring that the storage compartment has a larger volume. The condenser 4 and the compressor 1 are arranged at intervals in the left and right directions. A protruding fixing column is formed on the bottom plate of the evaporating dish 6, and the bottom end of the condenser 4 is fixed to the fixing column directly or through a connecting piece, so that the condenser 4 is fixed in the evaporating dish 6, and the bottom end of the condenser 4 can be higher than the liquid level of the defrosting water in the evaporating dish 6. A bottom cooling fan 5 for heat dissipation is also provided in the refrigerator 100, and a through hole (not marked in the figure) is opened on the side of the compressor cabin 10A facing the bottom cooling fan 5, and an exhaust port is provided on the refrigerator 100 for the outlet of the bottom cooling fan 5. In this embodiment, the bottom cooling fan 5 is a centrifugal fan, and the two sides of the centrifugal fan in the left and right directions are respectively attached to the compressor cabin 10A, and the inlet of the centrifugal fan is penetrated in the through hole of the compressor cabin 10A, so that the air in the compressor cabin 10A passes through the inlet of the centrifugal fan and is discharged from the compressor cabin 10A.

[0047] See also Figure 5 , Figure 5 : is a schematic diagram of the connection between the controller and multiple sensors provided in an embodiment of the utility model. The refrigerator described in the embodiment of the utility model includes:

[0048] A box body, in which a refrigerating chamber and a freezing chamber are formed, as well as a refrigerating air supply duct connected to the refrigerating chamber and a freezing air supply duct connected to the freezing chamber;

[0049] The controller 10 is disposed in the box and is electrically connected to the power module 20, the freezing temperature sensor 30, the refrigeration temperature sensor 40, the driving module 50, the heating module 70 and the frost temperature sensor 80;

[0050] A power module 20, connected to the controller 10, the freezing temperature sensor 30, the refrigeration temperature sensor 40, the driving module 50, the heating module 70 and the frost temperature sensor 80, respectively, and the power module 20 is used to supply power to these modules;

[0051] A freezing temperature sensor 30 is provided in the freezing chamber and is used to detect the freezing temperature of the freezing chamber;

[0052] A refrigeration temperature sensor 40 is provided in the refrigeration chamber and is used to detect the refrigeration temperature of the refrigeration chamber;

[0053] The electric damper 60 is arranged in the refrigerated air supply duct. When the electric damper 60 is closed, the refrigerated air supply duct stops supplying air. When the electric damper 60 is opened, the refrigerated air supply duct supplies air.

[0054] A driving module 50, electrically connected to the electric damper 60, for driving the electric damper 60 to open and close;

[0055] The heating module 70 is arranged in the refrigerated air supply duct, and the distance between the heating module 70 and the electric damper 60 is less than a preset first distance threshold; that is, the heating module 70 is arranged close to the electric damper 60, and when the heating module 70 is started, the high temperature will melt the ice / frost on the electric damper 60; it is worth noting that the first distance threshold can be set according to an empirical value, and the utility model does not make a specific limitation on this, but it is necessary to ensure that the setting position of the heating module 70 does not affect the rotation of the electric damper 60, and the electric damper 60 can be thawed quickly;

[0056] The frost temperature sensor 80 is arranged in the refrigerated air supply duct, and the distance between the frost temperature sensor 80 and the electric damper 60 is less than a preset second distance threshold; that is, the frost temperature sensor 80 is arranged close to the electric damper 60, and the temperature value detected by the frost temperature sensor 80 is used to evaluate whether the electric damper 60 is frozen / frosted; it is worth noting that the second distance threshold can be set according to an empirical value, and the present utility model does not make specific limitations on this, but it is necessary to ensure that the setting position of the frost temperature sensor 80 will not affect the rotation of the electric damper 60, and can accurately detect the temperature value of the electric damper 60.

[0057] See also Figure 6 , Figure 6This is a flowchart of the controller for starting the heating module provided by the embodiment of the utility model. A low temperature threshold is pre-stored in the controller 10. After obtaining the real-time temperature of the surrounding environment of the electric damper 60, the frost temperature sensor 80 compares the real-time temperature with the low temperature threshold. If the real-time temperature is less than or equal to the low temperature threshold, it means that the electric damper 60 is at risk of frost / icing at this time, and the controller 10 starts the heating module 70. The start-up time of the heating module 70 can be preset by the controller 10, such as shutting down after running for 2 minutes each time. If the real-time temperature is greater than the low temperature threshold, it means that the electric damper 60 is not at risk of frost / icing at this time, and the heating module 70 remains closed.

[0058] In the embodiment of the utility model, the frost temperature sensor 80 detects the icing condition of the electric damper 60, takes corresponding measures to prevent or solve the freezing of the electric damper 60, and heats the electric damper 60 in time to prevent the freezing of the electric damper 60. At the same time, it can also solve the invalid defrosting time and improve energy efficiency.

[0059] Specifically, the power module 20 is provided with a power converter. Figure 7 , Figure 7 It is a circuit diagram of a power module 20 provided in an embodiment of the utility model. The power module 20 is used as an ACDC converter, and a power chip IC1 is provided inside. The power chip IC1 can adopt a 7805 three-terminal regulator to convert a 12V power supply into a 5V power supply, and can convert AC power into DC power, wherein L1 is a live wire port, and N1 is a neutral wire port.

[0060] Specifically, see Figure 8 , Figure 8 1 is a schematic diagram of the chip pins of the controller provided in an embodiment of the utility model. The controller 10 is provided with a control chip IC2 and a first capacitor C1. The control chip IC2 may be a ZEN3316 chip. The control chip IC2 has 20 pins, which are directly connected to the power module 20, the freezing temperature sensor 30, the refrigeration temperature sensor 40, the driving module 50, the heating module 70 and the frost temperature sensor 80, or are connected through interfaces, such as Figure 8 The VDD pin is directly connected to the 5V output of the power module 20, one end of the first capacitor C1 is respectively connected to the VDD pin and the 5V output of the power module 20, and the other end of the first capacitor C1 is grounded. The function of the first capacitor C1 is filtering, which can stabilize the 5V power input of the control chip IC2.

[0061] Specifically, the controller 10 is connected to the refrigeration temperature sensor 40 and the freezing temperature sensor 30 via the first interface JP1. Fig. 9 , Fig. 9 It is a circuit diagram between the controller 10 and the first interface JP1 provided in an embodiment of the utility model. A first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a second capacitor C2 and a third capacitor C3 are arranged between the controller 10 and the first interface JP1.

[0062] Exemplarily, the first end of the first interface JP1 is respectively connected to the freezing temperature sensor 30, the first resistor R1 and the third resistor R3, the first resistor R1 is also respectively connected to the controller 10 and the second capacitor C2, and the other end of the second capacitor C2 is grounded. The third resistor R3, as a pull-up resistor of the freezing temperature sensor 30, forms a voltage component with the freezing temperature sensor 30 and inputs it into the AD2 port (TDO / AN2 / INT2 / P1.2 pin) of the controller 10, the first resistor R1 is a current limiting resistor from the freezing temperature sensor 30 to the AD2 port of the controller 10, and the AD2 port of the controller 10 reads the voltage value of the freezing temperature sensor 30, and the temperature value of the cold storage room at this time can be calculated by the voltage value. The second capacitor C2 filters the signal input of the freezing temperature sensor 30.

[0063] Exemplarily, the second end of the first interface JP1 is respectively connected to the refrigerated temperature sensor 40, the second resistor R2 and the fourth resistor R4, the second resistor R2 is also respectively connected to the controller 10 and the third capacitor C3, and the other end of the third capacitor C3 is grounded; the third end of the first interface JP1 is grounded. The fourth resistor R4 is used as a pull-up resistor of the refrigerated temperature sensor 40, and forms a voltage component with the refrigerated temperature sensor 40 and inputs into the AD1 port (AN1 / CMPN / P1.1 pin) of the controller 10. The second resistor R2 is a current limiting resistor from the refrigerated temperature sensor 40 to the AD1 port of the controller 10. The AD1 port of the controller 10 reads the voltage value of the refrigerated temperature sensor 40, and the temperature value of the freezer at this time can be calculated by the voltage value. The third capacitor C3 filters the signal input of the refrigerated temperature sensor 40.

[0064] Specifically, the heating module 70 includes a switch circuit 701 and a heating wire 702 , and the switch circuit 701 is connected to the controller 10 and the heating wire 702 , respectively.

[0065] For example, see Fig.10 , Fig.10It is a circuit diagram of the driving module 50, the heating module 70 and the second interface JP2 provided in the embodiment of the utility model. The switch circuit 701 includes a transistor Q1 and a fifth resistor R5. The base of the transistor Q1 is connected to the controller 10, the collector of the transistor Q1 is connected to the fifth resistor R5, the emitter of the transistor Q1 is grounded, and the fifth resistor R5 is also connected to the heating wire 702 through the second interface JP2. The transistor Q1 is an NPN transistor. The transistor Q1 and the fifth resistor R5 form a switch circuit of a heating wire. The base of the transistor Q1 is connected to the R-DAMP-HT port (T0 / P3.4 pin) of the controller 10. The controller 10 outputs a high level, so that the transistor Q1 is turned on, and the terminal of the heating wire 702 provides a low voltage, and the heating wire 702 works at this time. The controller 10 outputs a low level, so that the transistor Q1 is not turned on, and the terminal of the heating wire 702 provides a high voltage, and the heating wire 702 stops working at this time.

[0066] Specifically, Fig.10 As shown, the driving module 50 includes a driving chip IC3, a first filtering module and a second filtering module; wherein the driving chip IC3 is respectively connected to the controller 10, the first filtering module and the second filtering module, and the driving chip IC3 is also connected to the electric damper 60 through the second interface JP2.

[0067] Exemplarily, the driver chip IC3 can be a stepper motor driver chip, such as LB1909M. The IN2 pin of the driver chip IC3 is connected to the DAMP-INB port (AN0 / CMPP / P1.0 pin) of the controller through the sixth resistor R6, the IN1 pin of the driver chip IC3 is connected to the DAMP-INA port (CMP0 / P3.7 pin) of the controller through the seventh resistor R7, and the ENA pin of the driver chip IC3 is connected to the P-DAMP-EN port (PWM / PT1 / 3.5 pin) of the controller through the eighth resistor R8. The sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are all current limiting resistors. The first filtering module includes a fourth capacitor C4 and a fifth capacitor C5, the VCC pin of the driver chip IC3 is connected to the 12V output of the power module 20, one end of the four capacitors C4 and the fifth capacitor C5 are respectively connected to the VCC pin of the driver chip IC3, and the other end of the four capacitors C4 and the fifth capacitor C5 are grounded. The second filter module includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9, one end of which is connected to the OU1 pin, the OUT2 pin, the OUT3 pin and the OUT4 pin of the driver chip IC3, respectively, and the other end of which is grounded. The OU1 pin, the OUT2 pin, the OUT3 pin and the OUT4 pin of the driver chip IC3 are connected to the electric damper 60 through the second interface JP2, and the electric damper 60 is driven to rotate through these four output pins.

[0068] Specifically, the frost temperature sensor 80 includes a sensor chip IC4 and an electrode sheet. The sensor chip IC4 is connected to the controller 10 and the electrode sheet respectively. The electrode sheet is provided with a positive electrode and a negative electrode.

[0069] For example, see Fig.11 , Fig.11 : is a circuit diagram of the frost temperature sensor 80 provided by the embodiment of the utility model. The sensor chip IC4 can be an MDC02 chip. The VDD pin of the sensor chip IC4 is connected to the 5V output of the power module 20. The VDD pin of the sensor chip IC4 is also connected to a tenth capacitor C10. The tenth capacitor C10 is used for filtering and can stabilize the power input of the sensor chip IC4. The DQ pin of the sensor chip IC4 is connected to the third interface JP3, such as Fig.10The third interface JP3 is also connected to the second interface JP2, and the DQ pin of the sensor chip IC4 is connected to the DQ port (TXD / P3.1 pin) of the controller through the third interface JP3 and the second interface JP2. The electrode sheet uses the difference between the positive and negative electrodes to characterize the change in the dielectric constant of frost and saturated air condensation. This change in the dielectric constant can cause the change in the measured capacitance, thereby quantifying the dynamic process of condensation and ice (frost), characterizing it in the form of a numerical value of real-time temperature, and then transmitting the output signal (real-time temperature) through the DQ port to the controller 10.

[0070] Compared with the prior art, the refrigerator disclosed by the utility model is provided with a heating module and a frost temperature sensor at the electric damper. The temperature of the electric damper is detected by the frost temperature sensor. When the temperature is too low, it can be determined that there is a risk of ice / frost on the electric damper. At this time, the heating module is started, and the heat generated by the heating module is used to defrost the electric damper, so that the electric damper can be used normally to avoid overheating or overcooling in the compartment.

[0071] 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 protection scope of the present invention.

Claims

1. A refrigerator, characterized in that: include: A box body, in which a refrigerating chamber and a freezing chamber are formed, as well as a refrigerating air supply duct connected to the refrigerating chamber and a freezing air supply duct connected to the freezing chamber; An electric damper is arranged in the refrigerated air supply duct. When the electric damper is closed, the refrigerated air supply duct stops supplying air. When the electric damper is opened, the refrigerated air supply duct supplies air. A driving module, electrically connected to the electric damper, and used to drive the electric damper to open and close; A heating module is arranged in the refrigerated air supply duct, and the distance between the heating module and the electric damper is less than a preset first distance threshold; A frost temperature sensor is disposed in the refrigerated air supply duct, and the distance between the frost temperature sensor and the electric damper is less than a preset second distance threshold; The controller is electrically connected to the driving module, the heating module and the frost temperature sensor respectively.

2. The refrigerator according to claim 1, characterized in that: The refrigerator further comprises: A power supply module is respectively connected to the controller, the driving module, the heating module and the frost temperature sensor, and a power supply converter is provided in the power supply module.

3. The refrigerator according to claim 1, characterized in that: The refrigerator further comprises: A freezing temperature sensor is arranged in the freezing chamber; A refrigeration temperature sensor is arranged in the refrigeration chamber; Wherein, the controller is connected to the refrigeration temperature sensor and the freezing temperature sensor via a first interface.

4. The refrigerator according to claim 3, characterized in that: A first resistor, a second resistor, a third resistor, a fourth resistor, a second capacitor and a third capacitor are arranged between the controller and the first interface; wherein, The first end of the first interface is respectively connected to the freezing temperature sensor, the first resistor and the third resistor, the first resistor is also respectively connected to the controller and the second capacitor, and the other end of the second capacitor is grounded; The second end of the first interface is respectively connected to the refrigeration temperature sensor, the second resistor and the fourth resistor, the second resistor is also respectively connected to the controller and the third capacitor, and the other end of the third capacitor is grounded; The third end of the first interface is grounded.

5. The refrigerator according to claim 1, characterized in that: The heating module includes a switch circuit and a heating wire, and the switch circuit is connected to the controller and the heating wire respectively; wherein, The switch circuit includes a transistor and a fifth resistor, the base of the transistor is connected to the controller, the collector of the transistor is connected to the fifth resistor, the emitter of the transistor is grounded, and the fifth resistor is also connected to the heating wire.

6. The refrigerator according to claim 5, characterized in that: The transistor is an NPN transistor.

7. The refrigerator according to claim 1, characterized in that: The driving module includes a driving chip, a first filtering module and a second filtering module; wherein the driving chip is respectively connected to the controller, the first filtering module and the second filtering module, and the driving chip is also connected to the electric damper through a second interface.

8. The refrigerator according to claim 1, characterized in that The frost temperature sensor comprises a sensor chip and an electrode sheet. The sensor chip is connected to the controller and the electrode sheet respectively. The electrode sheet is provided with a positive electrode and a negative electrode.

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