A damper anti-freezing device

Abstract

The application provides a damper anti-freezing device, which comprises a damper assembly, a temperature sensor and a controller, wherein the damper assembly comprises a damper, a duct joint, a first heater and a second heater. The damper and the duct joint are clamped together, the first heater is arranged on a door plate of the damper, and the second heater is arranged around the periphery of the duct joint. By arranging the heaters on the damper door plate and the duct joint, the problem of frost formation on the damper is solved. Meanwhile, the temperature sensor detects the temperature of an interchamber, and the opening and closing of the double heaters are controlled according to the temperature of the interchamber, so that the energy consumption is reduced, and the refrigeration performance of the refrigerator is improved.

Description

Technical Field

[0001] This application relates to the field of refrigerator technology, and more particularly to a damper antifreeze device. Background Technology

[0002] A refrigerator is a refrigeration device that maintains a constant low temperature. Frost-free multi-door refrigerators can be divided into single-cooling-system and multi-cooling-system refrigerators. Most single-cooling-system refrigerators use dampers to control the airflow between compartments. These dampers can be single or double. Multi-door refrigerators use a single damper between the freezer and variable-temperature compartments. This single damper is equipped with a damper heater to prevent the door from freezing or frosting due to prolonged exposure to low temperatures. Because the variable-temperature compartment of a multi-door refrigerator has a wide temperature range (5℃ to -20℃), and the freezer compartment can reach -20℃, frost will not form on the damper between the freezer and variable-temperature compartments when the variable-temperature compartment is set to 5℃ or -20℃. However, when the variable-temperature compartment is set to -7℃ to -12℃, frost will form on the damper between the freezer and variable-temperature compartments. Frost on the damper affects its opening, and in severe cases, can cause it to malfunction, preventing the refrigerator from cooling the variable-temperature compartment as required and reducing the refrigerator's control precision.

[0003] Furthermore, due to the large temperature difference between the variable temperature channels and the variable temperature chambers, when the freezer stops cooling and the variable temperature chamber damper is closed, the relatively warm air in the variable temperature chamber will flow back into the variable temperature channel. This returning air will encounter the colder air at the damper location, causing frost to form on the damper. To reduce frost formation on the damper, heaters can be installed around the door frame of the variable temperature chamber damper. However, this method only prevents frost from forming around the door panel; it does not solve the problem of frost forming on the door panel itself. Summary of the Invention

[0004] This application provides an antifreeze device for dampers to solve the problem of frost formation on dampers.

[0005] In a first aspect, this application provides a damper antifreeze device, including a damper assembly, a temperature sensor, and a controller; the damper assembly includes a damper, a duct joint, a first heater, and a second heater; the damper and the duct joint are snapped together; the first heater is laid on the damper's door panel; the second heater is arranged around the periphery of the duct joint; the temperature sensor is disposed at the duct joint;

[0006] The controller is connected to the damper, the first heater, and the second heater respectively, and the controller is configured to:

[0007] The temperature of the chamber to be cooled, where the damper assembly is located, is detected by the temperature sensor.

[0008] The opening and closing states of the first heater, the second heater, and the damper are controlled according to the temperature of the chamber.

[0009] In one implementation, the first heater is provided with a glue-molding connecting layer, which is adhered to the door panel of the damper.

[0010] In one implementation, the first heater is a polyester film heater.

[0011] In one implementation, the duct connector is provided with a duct connector buckle, the duct connector buckle includes a connecting end and a free end, the connecting end of the duct connector buckle is connected to the duct connector, and the free end of the duct connector buckle extends toward the damper.

[0012] In one implementation, multiple duct connector clips are spaced apart on the duct connector.

[0013] In one implementation, the duct connector is provided with a mounting groove, and the side of the damper near the duct connector is provided with a protrusion that matches the mounting groove, the protrusion being inserted into the mounting groove.

[0014] In one implementation, the second heater is an aluminum foil heater.

[0015] In one implementation, the controller is further configured to:

[0016] When the operating state of the room to be cooled is cooling, the current temperature of the room to be cooled is detected;

[0017] Calculate the first temperature change value of the room to be cooled within the first time interval;

[0018] If the first temperature change value is less than or equal to the first change value and the current temperature of the room to be cooled is within the preset temperature range, the first heater and the second heater are turned on, and the damper is reset at preset intervals; if the first temperature change value is greater than the second change value, or if the heating time of the first heater and the second heater is greater than the second time, the first heater and the second heater are turned off.

[0019] If the first temperature change value is less than or equal to the first change value and the current temperature of the room to be cooled is not within the preset temperature range, the second heater is turned on, and the damper is reset at preset intervals; if the first temperature change value is greater than the second change value, or if the heating time of the second heater is greater than the second time, the second heater is turned off.

[0020] In one implementation, the controller is further configured to:

[0021] When the operating state of the room to be cooled is non-cooling, the current temperature of the room to be cooled is detected;

[0022] Calculate the second temperature change value of the room to be cooled within the third time interval;

[0023] If the second temperature change value is greater than or equal to the third change value and the current temperature of the room to be cooled is within the preset temperature range, the first heater and the second heater are turned on, and the damper is reset at preset intervals; when the second temperature change value is less than the fourth change value, or when the heating time of the first heater and the second heater is greater than the fourth time, the first heater and the second heater are turned off.

[0024] If the second temperature change value is greater than or equal to the third change value and the current temperature of the room to be cooled is not within the preset temperature range, the second heater is turned on, and the damper is reset at preset intervals; if the second temperature change value is less than the fourth change value, or if the heating time of the first heater and the second heater is greater than the fourth time, the second heater is turned off.

[0025] In one implementation, the preset temperature range is -7°C to -12°C.

[0026] As can be seen from the above technical solution, this application provides a damper antifreeze device, which includes a damper assembly, a temperature sensor, and a controller. The damper assembly includes a damper, an air duct connector, a first heater, and a second heater. The damper and the air duct connector are snap-fitted together. The first heater is installed on the damper's door panel, and the second heater is arranged around the periphery of the air duct connector. By installing heaters at both the damper's door panel and the air duct interface, the problem of damper frost formation is solved. Simultaneously, the temperature sensor detects the compartment temperature, and the opening and closing of the two heaters are controlled based on the compartment temperature, reducing energy consumption and improving the refrigerator's cooling performance. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is an exploded view of the damper assembly in the embodiments of this application;

[0029] Figure 2This is a schematic diagram of the damper assembly in the embodiments of this application;

[0030] Figure 3 This is a schematic diagram of the structure of the damper in the embodiments of this application;

[0031] Figure 4 This is a flowchart illustrating the control method of the damper antifreeze device in the embodiments of this application.

[0032] Illustration:

[0033] 100-Damper, 200-Duct connector, 210-Duct connector clip, 220-Mounting slot, 300-First heater, 400-Second heater. Detailed Implementation

[0034] The embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described below do not represent all embodiments consistent with this application. They are merely examples of systems and methods consistent with some aspects of this application as detailed in the claims.

[0035] Because the airflow direction of cold air between refrigerator compartments is controlled by dampers, prolonged exposure of the dampers to low temperatures can easily lead to door freezing or frost buildup. To reduce frost buildup, heaters can be installed around the damper frame. However, since the damper frame and door panel structure are fixed and have a small area, the heater power (no more than 1W) is low, reducing defrosting and antifreeze effectiveness. Furthermore, the refrigerator's variable temperature compartment has a wide temperature range, adjustable from 5℃ to -20℃. Even with heaters around the damper frame, frost will still form on the damper panel and its edges when the variable temperature compartment temperature is set to -7℃ to -12℃, reducing the refrigerator's cooling performance.

[0036] To address the problem of damper frost formation and improve cooling performance, some embodiments of this application provide a damper antifreeze device. The damper antifreeze device includes a damper assembly, a temperature sensor, and a controller, wherein, as shown... Figure 1 , Figure 2 As shown, the damper assembly includes a damper 100, an air duct connector 200, a first heater 300, and a second heater 400. The damper 100 and the air duct connector 200 are snap-fitted together. The first heater 300 is installed on the damper 100's door panel to prevent frost formation at the damper 100 and air duct connector 200 due to the cold air in the compartment passage. The second heater 400 is arranged around the perimeter of the air duct connector 200 to prevent frost formation on the damper door panel at specific temperatures. The dual heaters improve the efficiency of frost removal from the damper and reduce frost formation.

[0037] In some embodiments, such as Figure 3 As shown, to reduce the volume occupied by the damper antifreeze device, the first heater 300 is provided with a glue-molded connecting layer. This glue-molded connecting layer is adhered to the damper panel 100, thus allowing the first heater 300 to be attached to the damper panel 100. To improve adhesion, the glue-molded connecting layer can be a hot-melt adhesive. The first heater 300 is connected to the damper panel 100 by adhesive bonding, reducing the overall volume of the damper, making installation more convenient, improving production efficiency, and reducing costs.

[0038] In some embodiments, to improve the heating effect, the first heater 300 can be a polyester film heater (PET film heater), which heats in a planar manner, thereby improving thermal efficiency. For example, the first heater 300 is a polyester film heater, which is attached to the door panel of the damper 100 by a hot melt adhesive mold.

[0039] In some embodiments, the second heater 400 can be an aluminum foil heater, which can be made of double-sided adhesive aluminum foil, with one side attached to the heating wire and the other side attached around the air duct connector 200.

[0040] In some embodiments, such as Figure 1 , Figure 2 As shown, the duct connector 200 is provided with a duct connector clip 210, which includes a connecting end and a free end. The connecting end of the duct connector clip 210 is connected to the duct connector 200, and the free end of the duct connector clip 210 extends towards the damper 100, connecting the damper 100 and the duct connector 200. Multiple duct connector clips 210 can be provided, and these clips can be spaced apart on the duct connector 200.

[0041] To improve the tightness of the connection, the duct connector 200 is also provided with a mounting groove 220. The damper 100 has a protrusion on the side near the duct connector 200 that matches the mounting groove 220. The protrusion is inserted into the mounting groove 220, thereby connecting the damper 100 and the duct connector 200. For example, as... Figure 1 , Figure 2 As shown, the duct connector 200 is a square plastic part made of flame-retardant material. The square duct connector 200 has three duct connector clips 210 and a mounting groove 220 at one end near the damper 100. Two duct connector clips 210 are spaced apart on one side of the duct connector 200, and one duct connector clip 210 is located on the other side of the duct connector 200. The damper 100 has a protrusion that matches the mounting groove 220 on the side near the duct connector 200. The protrusion is inserted into the mounting groove 220, and the damper 100 is fixed in the mounting groove 220 by the duct connector clips 210.

[0042] The on / off states of the first heater 300, the second heater 400, and the damper 100 can be uniformly controlled by the controller of the damper antifreeze device. The controller can be connected to the damper 100, the first heater 300, and the second heater 400 via wired or wireless means, thereby controlling their respective on / off states. Since operating both heaters simultaneously requires significant energy consumption, a temperature sensor is installed at the duct joint 200 to reduce energy loss. The controller can detect the temperature of the compartment where the damper assembly is located and control the on / off states of the first heater 300, the second heater 400, and the damper 100 accordingly, minimizing energy loss caused by simultaneous heater operation.

[0043] like Figure 4 The diagram shown is a flowchart illustrating the control method of the damper antifreeze device provided in this application. The controller can detect the operating status of the room to be cooled. When the operating status of the room to be cooled is cooling, it detects the current temperature T1 of the room to be cooled. After an interval of time t1, it detects the current temperature T2 of the room to be cooled and calculates the first temperature change value ΔT1 = T2 - T1 of the room to be cooled within the interval of time t1.

[0044] If the first temperature change value ΔT1 is less than or equal to the first change value Ta, continue to determine whether the current temperature T2 of the room to be cooled is within the preset temperature range.

[0045] If the current temperature T2 is within the preset temperature range, the first heater 300 and the second heater 400 are turned on to start heating. A timer is started to record the heating time of the heaters and to control the damper 100 to reset. The damper 100 is controlled to reset once every preset time interval. This continues until the first temperature change value ΔT1 is greater than the second change value Tb, or the heating time of the first heater 300 and the second heater 400 is greater than the second time t2. Then, the first heater 300 and the second heater 400 are turned off, heating stops, and the damper 100 is controlled to reset. Damper reset means that the damper panel is closed.

[0046] If the current temperature T2 is not within the preset temperature range, the second heater 400 is turned on to start heating, and a timer is started to record the heating time. The damper 100 is also reset at preset time intervals. This process continues until the first temperature change value ΔT1 is greater than the second change value Tb, or until the heating time of the second heater 400 is greater than the second time t2. Then, the second heater 400 is turned off, and the damper 100 is reset.

[0047] The preset temperature range can be a temperature range of -7℃ to -12℃. That is, if -7℃≤T2≤-12℃, the current temperature T2 is determined to be within the preset temperature range; otherwise, the current temperature T2 is determined to be outside the preset temperature range.

[0048] When the operating state of the room to be cooled is non-cooling, the current temperature T3 of the room to be cooled is detected. After a third time interval t3, the current temperature T4 of the room to be cooled is detected. The second temperature change value ΔT2 = T4 - T3 of the room to be cooled within the third time interval t3 is calculated.

[0049] If the second temperature change value ΔT2 is greater than or equal to the third change value Tc, continue to determine whether the current temperature T4 of the room to be cooled is within the preset temperature range.

[0050] If the current temperature T4 is within the preset temperature range, the first heater 300 and the second heater 400 are turned on to start heating. A timer is started to record the heating time of the heaters and to control the damper 100 to reset. The damper 100 is controlled to reset once every preset time interval. This continues until the second temperature change value ΔT2 is less than the fourth change value Td, or the heating time of the first heater 300 and the second heater 400 is greater than the fourth time t4. Then, the first heater 300 and the second heater 400 are turned off, heating is stopped, and the damper 100 is controlled to reset.

[0051] If the current temperature T4 is not within the preset temperature range, the second heater 400 is turned on to start heating, and a timer is started to record the heating time. The damper 100 is also reset at preset intervals. This process continues until the second temperature change value ΔT2 is less than the fourth change value Td, or until the heating time of the first heater 300 and the second heater 400 is greater than the fourth time t4. At this point, the second heater 400 is turned off, heating stops, and the damper 100 is reset.

[0052] In this embodiment, a dual heater is provided. The first heater 300 is attached to the damper 100 panel using a hot melt adhesive mold, and the second heater 400 is attached to the perimeter of the duct connector 200 using adhesive aluminum foil. The damper 100 is connected to the duct connector 200 via the duct connector clip 210 and mounting groove 220, resulting in a simple structure. Simultaneously, the opening and closing of the dual heaters are controlled by the chamber temperature, reducing energy consumption and minimizing frost formation on the damper 100.

[0053] The aforementioned damper assembly can be installed between the compartments of the refrigerator. By opening and closing the damper baffle, cold air is introduced into different compartments, thereby controlling the cooling of different compartments. For example, the damper assembly is installed in the air duct between the variable temperature compartment and the freezer compartment. The damper assembly controls the airflow from the freezer compartment to the variable temperature compartment. For a single-system multi-compartment refrigerator, the airflow direction between the variable temperature compartment and the freezer compartment can be directly controlled by the variable temperature air duct and the damper assembly. When installing the damper assembly in the refrigerator, firstly, the air duct connector 200 and the second heater 400 are assembled and installed at the air duct connector 200 between the freezer compartment and the variable temperature compartment. Secondly, after the refrigerator body is foamed, the damper 100 is fixed in the mounting groove 220 of the air duct connector 200 in the variable temperature compartment using the air duct connector clip 210.

[0054] The following section uses a single-system multi-compartment refrigerator as an example to illustrate the control method of the damper antifreeze device provided in this application.

[0055] In a single-system multi-compartment refrigerator, the variable temperature compartment and the freezer compartment can control the airflow direction through variable temperature air ducts and damper assemblies. The temperature of the variable temperature compartment can be adjusted from 5℃ to -20℃. When the refrigerator is powered on, the controller monitors the operating status of the variable temperature compartment.

[0056] When the variable temperature chamber is in cooling mode, the temperature T1 of the variable temperature chamber is detected by the temperature sensor. In the cooling mode, the damper 100 door is open, causing the temperature of the variable temperature chamber to continue to decrease. After a period of time t1 = 20 minutes, the controller detects the temperature T2 of the variable temperature chamber and calculates the temperature change value ΔT1 = T2 - T1.

[0057] If ΔT1 ≤ Ta and Ta = 0℃, it indicates that the temperature of the variable temperature chamber has reached the set temperature and further cooling is not required. At this time, the controller can close the damper to 100°. However, due to possible frost buildup around the damper frame, the door may not close tightly, causing cold leakage, or the door may freeze shut. Therefore, it is necessary to determine whether to activate the heater for heating.

[0058] The controller can determine whether the temperature T2 of the variable temperature compartment is within the range of -7℃≤T2≤-12℃. If it is within this range, the damper door panel is prone to frost and freezing, and the temperature difference between the variable temperature compartment and the freezer compartment can easily cause ice to form around the damper door frame, making the damper unable to close tightly. Therefore, the controller can simultaneously turn on the first heater 300 and the second heater 400 to heat and remove the frost around the door frame and on the door panel.

[0059] When the first heater 300 and the second heater 400 are turned on, the controller starts timing the heating time t2 and controls the damper 100 to reset. The damper 100 resets once every tm = 30 minutes. The controller stops heating and controls the damper 100 to reset when the temperature difference ΔT1 of the variable temperature chamber is greater than Tb and Tb = 1℃, indicating that the damper 100 has been completely closed, or when the heating time reaches t2 = 60 minutes.

[0060] The controller determines whether the temperature T2 of the variable temperature compartment is within the range of -7℃≤T2≤-12℃. If it is not within this range, it indicates that the frost rate on the door panel is low. In this case, it is not necessary to turn on the first heater 300; instead, the second heater 400 should be turned on to remove the frost from the duct joint 200 and the door frame of the damper 100. This prevents the door panel from not closing tightly when the damper closes or resets, which could cause cold leakage and reduce cooling performance. Therefore, the controller turns on the second heater 400.

[0061] When the second heater 400 is turned on, the controller starts timing the heater heating time and controls the damper 100 to reset, resetting the damper 100 every tm = 30 minutes. The controller then turns off the second heater 400, stops heating, and controls the damper 100 to reset once ΔT1 > Tb, Tb = 1℃, or the heater heating time reaches t2 = 60 minutes.

[0062] When the variable temperature chamber is in non-cooling mode, the temperature T3 of the variable temperature chamber is detected by the temperature sensor. In the non-cooling mode, the damper 100 door is closed and the temperature of the variable temperature chamber continues to rise. After a period of time t3 = 15 minutes, the controller detects the temperature T4 of the variable temperature chamber and calculates the temperature change value ΔT2 = T4 - T3.

[0063] If ΔT2 ≥ Tc, and Tc = 0.5℃, it indicates that the temperature of the variable temperature compartment exceeds the set temperature, and cooling needs to continue. At this time, the controller can control the damper to open 100%. However, due to possible frost around the damper frame, the door may not open properly, or the door may freeze shut.

[0064] The controller can determine whether the temperature T4 of the variable temperature chamber is within the range of -7℃≤T2≤-12℃. If it is within this range, the damper door panel is prone to frost and freezing, and the temperature difference between the variable temperature chamber and the freezer chamber can easily cause ice to form around the damper door frame. Therefore, the controller can simultaneously turn on the first heater 300 and the second heater 400 to heat and remove the frost around the door frame and on the door panel.

[0065] When the first heater 300 and the second heater 400 are turned on, the controller starts timing the heating time t4 and controls the damper 100 to reset. The damper 100 resets once every tm = 30 minutes. The controller stops heating and controls the damper 100 to reset when the temperature difference ΔT2 in the variable temperature chamber is less than Td and Td = 1℃, indicating that the damper 100 has been completely closed, or when the heating time reaches t4 = 100 minutes.

[0066] The controller determines whether the temperature T4 of the variable temperature compartment is within the range of -7℃≤T2≤-12℃. If it is not within this range, it indicates that the door panel may have low frost buildup. In this case, it is not necessary to turn on the first heater 300; instead, the second heater 400 should be turned on to remove the frost from the duct joint 200 and the door frame of the damper 100. This prevents the door panel from not closing tightly when the damper closes or resets, which could cause cold leakage and reduce cooling performance. Therefore, the controller turns on the second heater 400.

[0067] When the second heater 400 is turned on, the controller starts timing the heater heating time and resets the damper 100, resetting it every tm = 30 minutes. The controller shuts off the second heater 400, stops heating, and resets the damper 100 once every tm = 30 minutes, until the temperature difference between the variable temperature chambers ΔT2 < Td, Td = 1℃, or the heater heating time reaches t4 = 100 minutes.

[0068] As can be seen from the above technical solutions, this application provides a damper antifreeze device, which includes a damper assembly, a temperature sensor, and a controller. The damper assembly includes a damper 100, an air duct connector 200, a first heater 300, and a second heater 400. The damper 100 and the air duct connector 200 are snapped together. The first heater 300 is installed on the door panel of the damper 100, and the second heater 400 is arranged around the periphery of the air duct connector 200. By installing heaters at both the damper door panel and the air duct interface, the problem of damper frost formation is solved. Simultaneously, the temperature sensor detects the compartment temperature, and the opening and closing of the two heaters are controlled according to the compartment temperature, reducing energy consumption and improving the refrigerator's cooling performance.

[0069] Similar parts between the embodiments provided in this application can be referred to mutually. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods extended from the solution of this application without creative effort shall fall within the scope of protection of this application.

Claims

1. A damper antifreeze device, characterized in that, include: Damper assembly, temperature sensor and controller; The damper assembly includes a damper (100), a duct connector (200), a first heater (300), and a second heater (400); the damper (100) and the duct connector (200) are snapped together; the first heater (300) is installed on the door panel of the damper (100); the second heater (400) is arranged around the periphery of the duct connector (200); and the temperature sensor is located at the duct connector (200). The controller is connected to the damper (100), the first heater (300), and the second heater (400) respectively, and the controller is configured to: The temperature of the chamber to be cooled, where the damper assembly is located, is detected by the temperature sensor. The on / off states of the first heater (300), the second heater (400), and the damper (100) are controlled according to the temperature of the chamber. The controller is also configured to: When the operating state of the room to be cooled is cooling, the current temperature of the room to be cooled is detected; Calculate the first temperature change value of the room to be cooled within the first time interval; If the first temperature change value is less than or equal to the first change value and the current temperature of the room to be cooled is within the preset temperature range, the first heater (300) and the second heater (400) are turned on, and the damper (100) is reset at preset intervals; when the first temperature change value is greater than the second change value, or when the heating time of the first heater (300) and the second heater (400) is greater than the second time, the first heater (300) and the second heater (400) are turned off. If the first temperature change value is less than or equal to the first change value and the current temperature of the room to be cooled is not within the preset temperature range, the second heater (400) is turned on and the damper (100) is reset at preset intervals; when the first temperature change value is greater than the second change value, or when the heating time of the second heater (400) is greater than the second time, the second heater (400) is turned off.

2. The damper antifreeze device according to claim 1, characterized in that, The first heater (300) is provided with a glue-mold connecting layer, which is attached to the door panel of the damper (100).

3. The damper antifreeze device according to claim 1, characterized in that, The first heater (300) is a polyester film heater.

4. The damper antifreeze device according to claim 1, characterized in that, The air duct connector (200) is provided with an air duct connector buckle (210), the air duct connector buckle (210) includes a connecting end and a free end, the connecting end of the air duct connector buckle (210) is connected to the air duct connector (200), and the free end of the air duct connector buckle (210) extends toward the damper (100).

5. The damper antifreeze device according to claim 4, characterized in that, Multiple duct connector clips (210) are spaced apart on the duct connector (200).

6. The damper antifreeze device according to claim 1, characterized in that, The air duct connector (200) is provided with an installation groove (220), and the air damper (100) is provided with a protrusion that matches the installation groove (220) on the side near the air duct connector (200), and the protrusion is inserted into the installation groove (220).

7. The damper antifreeze device according to claim 1, characterized in that, The second heater (400) is an aluminum foil heater.

8. The damper antifreeze device according to claim 1, characterized in that, The controller is also configured to: When the operating state of the room to be cooled is non-cooling, the current temperature of the room to be cooled is detected; Calculate the second temperature change value of the room to be cooled within the third time interval; If the second temperature change value is greater than or equal to the third change value and the current temperature of the room to be cooled is within the preset temperature range, the first heater (300) and the second heater (400) are turned on, and the damper (100) is reset at preset intervals; when the second temperature change value is less than the fourth change value, or when the heating time of the first heater (300) and the second heater (400) is greater than the fourth time, the first heater (300) and the second heater (400) are turned off. If the second temperature change value is greater than or equal to the third change value and the current temperature of the room to be cooled is not within the preset temperature range, the second heater (400) is turned on and the damper (100) is reset at preset intervals; when the second temperature change value is less than the fourth change value, or when the heating time of the first heater (300) and the second heater (400) is greater than the fourth time, the second heater (400) is turned off.

9. The damper antifreeze device according to claim 8, characterized in that, The preset temperature range is -7℃ to -12℃.

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