Ice melting system, control method of outdoor unit and air conditioner

Abstract

The application relates to the air conditioning technical field, and provides an ice melting system of an outdoor unit, a control method and an air conditioner. The ice melting system of the outdoor unit comprises a temperature monitoring assembly, the temperature monitoring assembly is arranged on an evaporator, and is used for monitoring temperature values at different height positions of the evaporator; a controller, the controller is in signal connection with the temperature monitoring assembly, the controller is used for receiving the temperature values at the different height positions of the evaporator and obtaining temperature value differences at the different height positions of the evaporator; and a heater, the heater is in electric control connection with the controller; wherein the controller is used for controlling the working state of the heater according to the size relation between the temperature value differences and preset values. The ice melting system of the outdoor unit, the control method and the air conditioner provided by the application analyze the icing characteristics of the outdoor unit, monitor the temperatures at different spatial positions of the evaporator, can accurately determine when to start the ice melting operation, melt ice in time, improve the ice melting effect, and further improve the heating efficiency of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an outdoor unit de-icing system, control method, and air conditioner. Background Technology

[0002] Heat pump systems produce condensate during operation. Condensate refers to the liquid water formed when gaseous water condenses at low temperatures, and it flows into the heat pump chassis. During winter use, due to low ambient temperatures, the chassis may freeze. Once frozen, the condensate cannot drain, causing ice buildup. When this ice accumulates at the heat exchanger, it affects the heat pump's heat exchange efficiency and, in severe cases, can damage the equipment.

[0003] Existing technical solutions mostly involve heating defrosting, which involves laying heating wires on the chassis of the heat pump equipment. When the air conditioner freezes, the control unit controls the heating wires to heat up and melt the ice. However, the existing technical solutions are not precise in determining when to start the ice-melting operation, which may result in the problem of untimely ice-melting.

[0004] The above-mentioned ice-melting methods also have the following drawbacks:

[0005] 1. Electric heating for melting ice requires a large amount of electricity and has a high operating cost;

[0006] 2. In winter, the chassis may freeze, and the outer insulation layer of the heating wire may crack. A cracked insulation layer means that the equipment may leak electricity, posing a high safety hazard.

[0007] 3. Electric defrosting has a high power consumption, which will increase the system's electrical load. Summary of the Invention

[0008] This invention provides an outdoor unit de-icing system, control method, and air conditioner to solve the problem of inaccurate determination of when to start the de-icing operation in the prior art, which may result in untimely de-icing. By accurately determining the de-icing timing, the de-icing is carried out in a timely manner, thereby improving the de-icing effect.

[0009] The present invention provides an outdoor unit de-icing system, comprising:

[0010] A temperature monitoring component, which is mounted on the evaporator, is used to monitor the temperature values ​​at different height positions on the evaporator;

[0011] A controller is connected to the temperature monitoring component via a signal. The controller is used to receive temperature values ​​at different height positions on the evaporator and obtain the temperature value difference at different height positions on the evaporator.

[0012] The heater is electrically connected to the controller; wherein...

[0013] The controller is used to control the operating state of the heater based on the relationship between the temperature difference and a preset value.

[0014] According to the present invention, an outdoor unit de-icing system includes a temperature monitoring component comprising a plurality of temperature sensors, which are sequentially disposed at different height positions on the evaporator.

[0015] According to the present invention, an outdoor unit de-icing system includes a temperature sensor comprising:

[0016] A first temperature sensor is used to monitor the temperature value at a first location of the evaporator;

[0017] A second temperature sensor is used to monitor the temperature value at a second location of the evaporator;

[0018] A third temperature sensor is used to monitor the temperature value at a third location on the evaporator; wherein...

[0019] A height difference exists between the first position, the second position, and the third position.

[0020] According to the present invention, an outdoor unit de-icing system includes a heater comprising:

[0021] A water storage tank, wherein the water storage tank stores the heat exchange medium;

[0022] A heat transfer unit is installed on the outdoor unit chassis and / or evaporator, and the heat transfer unit is connected to the water storage tank;

[0023] A circulating water pump is located at the outlet of the water storage tank, and the controller is electrically connected to the circulating water pump to control the working status of the circulating water pump.

[0024] A heating unit is provided between the circulating water pump and the heat transfer unit for heating the heat exchange medium. The controller is electrically connected to the heating unit for controlling the working state of the heating unit.

[0025] According to the present invention, an outdoor unit de-icing system is provided, wherein the heat transfer unit includes a coil.

[0026] The present invention also provides a control method for an outdoor unit's de-icing system, comprising:

[0027] S1. Obtain the temperature values ​​at different height positions on the evaporator;

[0028] S2. Obtain the temperature difference at different heights on the evaporator, and control the working state of the heater located on the outdoor unit according to the relationship between the temperature difference and the preset value.

[0029] According to the control method of the ice-melting system provided by the present invention, the step S1 of obtaining temperature values ​​at different heights on the evaporator specifically includes:

[0030] Obtain a first temperature value at a first position of the evaporator, a second temperature value at a second position of the evaporator, and a third temperature value at a third position of the evaporator; wherein,

[0031] A height difference exists between the first position, the second position, and the third position.

[0032] According to a control method for an ice-melting system provided by the present invention, step S2, which involves obtaining the temperature difference at different heights on the evaporator and controlling the operating state of the heater located on the outdoor unit based on the relationship between the temperature difference and a preset value, specifically includes:

[0033] When the difference between the first temperature value and the second temperature value is less than or equal to a first preset value and the difference between the second temperature value and the third temperature value is less than or equal to a second preset value, the controller controls the heater to turn off.

[0034] When the difference between the first temperature value and the second temperature value is greater than the first preset value and / or when the difference between the second temperature value and the third temperature value is greater than the second preset value, the controller controls the heater to start and continuously heat the outdoor unit for a first preset time.

[0035] According to a control method for an ice-melting system provided by the present invention, after the controller controls the heater to start and continuously heat the outdoor unit for a first set time when the difference between the first temperature value and the second temperature value is greater than the first preset value and / or when the difference between the second temperature value and the third temperature value is greater than the second preset value, the method further includes:

[0036] S3. If the difference between the first temperature value and the second temperature value is less than or equal to the first preset value, the controller controls the heater to start and continuously heat the outdoor unit for a second preset duration; wherein...

[0037] The duration of the first set duration is longer than the duration of the second set duration.

[0038] The present invention also provides an air conditioner, comprising: an ice-melting system for an outdoor unit according to an embodiment of the present invention, or a control method using an ice-melting system for an outdoor unit according to an embodiment of the present invention.

[0039] This invention provides an outdoor unit de-icing system. A temperature monitoring component monitors the temperature at different heights of the evaporator, and a controller calculates the temperature difference at these heights to determine whether the heater needs to perform de-icing operations on the outdoor unit. This invention analyzes the characteristics of outdoor unit icing and, by monitoring the temperature at different locations on the evaporator, accurately determines when to initiate de-icing operations, ensuring timely de-icing, improving de-icing efficiency, and ultimately enhancing the air conditioner's heating efficiency.

[0040] Furthermore, the present invention provides a control method for an outdoor unit's de-icing system. By acquiring temperature values ​​at different heights on the evaporator, a temperature difference is obtained. The working state of the heater on the outdoor unit is controlled according to the relationship between the temperature difference and a preset value. This accurately determines the de-icing timing and allows for timely switching to the de-icing process, improving the de-icing effect and thus increasing the air conditioning heating efficiency.

[0041] Furthermore, the air conditioner provided by the present invention, since it includes the de-icing system of the outdoor unit in the above embodiments of the present invention or the control method of the de-icing system of the outdoor unit in the above embodiments of the present invention, has the same advantages as above. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the de-icing system module of the outdoor unit provided by the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the first temperature sensor, the second temperature sensor and the third temperature sensor provided by the present invention installed on the evaporator;

[0045] Figure 3 This is a schematic diagram of the heater provided by the present invention;

[0046] Figure 4 This is a flowchart illustrating one embodiment of the control method for the de-icing system of the outdoor unit provided by the present invention.

[0047] Figure label:

[0048] 1: Outdoor unit; 2: Chassis; 3: Heat transfer unit; 4: Water storage tank; 5: Circulating water pump; 6: Heating unit; 7: Temperature monitoring component; 71: First temperature sensor; 72: Second temperature sensor; 73: Third temperature sensor; 8: Controller; 9: Evaporator; 10: Heater. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0050] The following is combined Figures 1-3 This invention describes an outdoor unit de-icing system. The outdoor unit de-icing system includes: a temperature monitoring component 7, a controller 8, and a heater 10.

[0051] Specifically, the temperature monitoring component 7 is installed on the evaporator 9 to monitor the temperature values ​​at different height positions on the evaporator 9; the controller 8 is signal-connected to the temperature monitoring component 7, and the controller 8 is used to receive the temperature values ​​at different height positions on the evaporator 9 and obtain the temperature value difference at different height positions on the evaporator 9; the heater 10 is electrically connected to the controller 8. The controller 8 is used to control the operating state of the heater 10 according to the relationship between the temperature value difference and a preset value.

[0052] More specifically, the temperature monitoring component 7 is installed at different height positions on the evaporator 9, and can be in the form of a temperature sensor. By monitoring the temperature at different height positions on the evaporator 9, it can be determined whether the evaporator 9 needs to undergo de-icing operations. Figure 1 As shown, the temperature monitoring component 7 includes at least two temperature sensors: a first temperature sensor 71 and a second temperature sensor 72. Generally, during operation, the evaporator 9 exchanges heat with a blower. If the temperature sensor is inside an ice layer (i.e., sealed by ice), it cannot exchange heat with the blower, resulting in a lower monitored temperature. On the other hand, the chassis 2 is located below the evaporator 9. If the chassis 2 is icy, the temperature at the bottom of the evaporator 9 near the chassis 2 will be lower, meaning there is a temperature difference at different heights of the evaporator 9. If the detected temperature difference is greater than a preset value, it is determined that the outdoor unit 1 is icy, requiring de-icing. If the temperature values ​​at different heights are equal or the difference is small, it indicates that the temperature sensor is not icy or is not near an icy location, thus confirming that neither the evaporator 9 nor the chassis 2 is icy.

[0053] Furthermore, the heater 10 can be installed on the evaporator 9 and / or the chassis 2 as needed to melt the ice. Generally, when the temperature difference at different heights of the evaporator 9 is greater than a preset value, it may indicate that the evaporator 9 and / or the chassis 2 are icing up, so an ice-melting operation is required, and the controller 8 controls the corresponding heater 10 to start.

[0054] Furthermore, the aforementioned preset values ​​need to be set according to the actual environment and working conditions. Before setting the preset values, experiments can be conducted to monitor the temperature difference at different heights on the evaporator 9 at which icing occurs on the evaporator 9 and / or the chassis 2. This value can be used as a standard to adjust the specific value of the preset values ​​accordingly. In this embodiment, the preset values ​​are selected within the range of 5°C to 10°C.

[0055] This invention provides an outdoor unit de-icing system. A temperature monitoring component 7 monitors the temperature at different heights of the evaporator 9, and a controller 8 calculates the temperature difference at these different heights to determine whether the heater 10 needs to perform de-icing operations on the outdoor unit 1. This invention analyzes the icing characteristics of the outdoor unit 1 and, by monitoring the temperature at different locations on the evaporator 9, accurately determines when to initiate de-icing operations, ensuring timely de-icing, improving de-icing efficiency, and ultimately enhancing the air conditioning's heating efficiency.

[0056] In one embodiment of the present invention, such as Figure 2 As shown, the temperature monitoring component 7 includes multiple temperature sensors, which are sequentially positioned at different heights on the evaporator 9. Preferably, the temperature sensors include a first temperature sensor 71, a second temperature sensor 72, and a third temperature sensor 73. The first temperature sensor 71 monitors the temperature at a first position on the evaporator 9; the second temperature sensor 72 monitors the temperature at a second position on the evaporator 9; and the third temperature sensor 73 monitors the temperature at a third position on the evaporator 9. A height difference exists between the first, second, and third positions. In this embodiment, the temperature sensors (i.e., the first temperature sensor 71, the second temperature sensor 72, and the third temperature sensor 73) monitor the temperature values ​​at different heights on the evaporator 9. The controller 8 receives the temperature values ​​monitored by the sensors, calculates the temperature difference, compares it with a preset value, and controls the operating state of the heater 10 based on the comparison.

[0057] In one embodiment of the present invention, such as Figure 3As shown, the heater 10 includes: a water storage tank 4, a heat transfer unit 3, a circulating water pump 5, and a heating unit 6. The water storage tank 4 stores the heat exchange medium; the heat transfer unit 3 is located on the outdoor unit chassis 2 and / or the evaporator 9, and is connected to the water storage tank 4; the circulating water pump 5 is located at the outlet of the water storage tank 4, and a controller 8 is electrically connected to the circulating water pump 5 to control its operating status; the heating unit 6 is located between the circulating water pump 5 and the heat transfer unit 3 to heat the heat exchange medium, and the controller 8 is electrically connected to the heating unit 6 to control its operating status. Preferably, the heat transfer unit 3 includes a coil. In this embodiment, depending on the object to be melted, the coil can be located on the outdoor unit chassis 2 and / or the evaporator 9, such as... Figure 1 In this embodiment, the coil is mounted on the chassis 2, and water flows through the coil via a circulating water pump 5. The water is heated by a heating unit 6, which preferably uses a gas-fired heating element. When de-icing is required, the controller 8 activates both the circulating water pump 5 and the heating unit 6 simultaneously, allowing hot water to heat the outdoor unit chassis 2 and / or the evaporator 9 via the coil. This hot water heating method avoids the leakage problems caused by the breakdown of the heating wire insulation layer after prolonged use, which is a problem with electric heating methods, thus improving system safety. Furthermore, gas heating is more economical than electric heating, reducing electrical load and offering advantages in energy saving and emission reduction.

[0058] The following is combined with Figure 4 This invention describes a control method for an outdoor unit's de-icing system. The control method for the outdoor unit's de-icing system includes the following steps:

[0059] S1. Obtain the temperature values ​​at different height positions on the evaporator 9;

[0060] S2. Obtain the temperature difference at different height positions on the evaporator 9, and control the working state of the heater 10 located on the outdoor unit 1 according to the relationship between the temperature difference and the preset value.

[0061] Specifically, temperature sensors are installed at different heights on the evaporator 9 to monitor the temperature values. The temperature sensors are connected to the controller 8 to transmit the temperature values. The controller 8 calculates and obtains the temperature difference at different heights, compares the temperature difference with a preset value, and determines whether to perform an ice-melting operation based on the comparison.

[0062] Furthermore, two temperature sensors (i.e., such as...) can be set up. Figure 1Taking the first temperature sensor 71 and the first temperature sensor 72 shown as examples, the two temperature sensors are respectively set at different height positions on the evaporator 9 and monitor the first temperature value and the second temperature value. When the difference between the first temperature value and the second temperature value is less than or equal to a first preset value (hereinafter referred to as condition one), it is determined that no ice-melting operation is needed, and the controller 8 controls the heater 10 to turn off; when the difference between the first temperature value and the second temperature value is greater than the first preset value (hereinafter referred to as condition two), it is determined that an ice-melting operation is needed, and the controller 8 controls the heater 10 to start and heat the outdoor unit 1. It should be understood that if both the first temperature value and the second temperature value are below 0°C and the temperature difference is low, the outdoor unit 1 may also have ice formation. Therefore, the determination process of this embodiment of the invention is performed before ice formation begins or after heating has continued for a period of time, and the accuracy of the ice-melting determination is high.

[0063] Furthermore, after the de-icing operation has continued for a first set duration, if condition one is met, it means that the ice layer on outdoor unit 1 has thawed, and heating of outdoor unit 1 continues for a second set duration to prevent unmelted ice from remaining outside the temperature sensor. After sufficient de-icing, the system exits the de-icing mode. If condition two is met, it means that ice still exists on outdoor unit 1, and heating of outdoor unit 1 continues for the first set duration. Preferably, the first set duration is 20 minutes and the second set duration is 10 minutes. It should be understood that the first and second set durations can be adjusted accordingly based on the actual environment and working conditions, and the present invention is not limited to the duration control in the above embodiments.

[0064] The present invention provides a control method for an outdoor unit's de-icing system. By acquiring temperature values ​​at different heights on the evaporator 9, the method obtains temperature value differences and controls the working state of the heater 10 on the outdoor unit 1 based on the relationship between the temperature value differences and preset values. This method accurately determines the de-icing timing and can promptly switch to the de-icing process, thereby improving the de-icing effect and ultimately increasing the air conditioning heating efficiency.

[0065] In one embodiment of the present invention, step S1 involves acquiring temperature values ​​at different heights on the evaporator 9, specifically including: acquiring a first temperature value at a first position of the evaporator 9, a second temperature value at a second position of the evaporator 9, and a third temperature value at a third position of the evaporator 9; wherein a height difference exists between the first, second, and third positions. In this embodiment, a temperature sensor is set at each of the first, second, and third positions of the evaporator 9 to monitor the temperature value at the corresponding position and feed it back to the controller 8. In this embodiment, in addition to the first and second temperature values ​​monitored by the first temperature sensor 71 and the first temperature sensor 72, a third temperature sensor 73 is added to monitor the third temperature value. The purpose of setting the third temperature sensor 73 is that if any two of the three temperature sensors are within the ice layer, the temperature difference between them is small, making it difficult to switch to the ice-melting state in time. The addition of a third temperature sensor allows for two judgments; that is, if the temperature difference between adjacent temperature sensors exceeds a preset value, it is determined that icing has occurred and ice-melting operation is required. In this embodiment, by adding the third temperature sensor 73, the accuracy of ice-melting judgment is improved, and the system switches to the ice-melting state in a timely manner.

[0066] In one embodiment of the present invention, step S2 obtains the temperature difference at different height positions on the evaporator 9, and controls the working state of the heater 10 located on the outdoor unit 1 according to the relationship between the temperature difference and a preset value, specifically including the following two cases:

[0067] When the difference between the first temperature value and the second temperature value is less than or equal to the first preset value and the difference between the second temperature value and the third temperature value is less than or equal to the second preset value (hereinafter referred to as condition three), the controller 8 controls the heater 10 to turn off;

[0068] When the difference between the first temperature value and the second temperature value is greater than the first preset value and / or when the difference between the second temperature value and the third temperature value is greater than the second preset value (hereinafter referred to as condition four), the controller 8 controls the heater 10 to start and continuously heat the outdoor unit 1 for the first preset time.

[0069] Preferably, the first preset value and the second preset value may be equal or unequal in value. In this embodiment, the first preset value and the second preset value are selected within the range of 5°C to 10°C.

[0070] In one embodiment of the present invention, after the step of the controller 8 controlling the heater 10 to start and continuously heat the outdoor unit 1 for a first preset time when the difference between the first temperature value and the second temperature value is greater than a first preset value and / or when the difference between the second temperature value and the third temperature value is greater than a second preset value, the method further includes: S3, if the difference between the first temperature value and the second temperature value is less than or equal to the first preset value, the controller 8 controlling the heater 10 to start and continuously heat the outdoor unit 1 for a second preset time; wherein, the duration of the first preset time is longer than the duration of the second preset time. In this embodiment, after the de-icing operation has continued for the first preset time, if condition three is met, it means that the ice layer of the outdoor unit 1 has thawed, and the outdoor unit 1 continues to be heated for the second preset time to avoid the phenomenon of unmelted ice outside the temperature sensor. After the ice is fully melted, the system exits the de-icing mode; if condition four is met, it means that the outdoor unit 1 still has ice, and the outdoor unit 1 continues to be heated for the first preset time. Preferably, the first set duration is 20 minutes and the second set duration is 10 minutes. It should be understood that the first and second set durations can be adjusted according to the actual environment and working conditions. The present invention is not limited to the duration control in the above embodiments.

[0071] The present invention also provides an air conditioner. The air conditioner includes: an ice-melting system for the outdoor unit as described in the above embodiments of the present invention, or a control method using the ice-melting system for the outdoor unit as described in the above embodiments of the present invention.

[0072] The air conditioner provided by the present invention has the same advantages as described above because it includes the de-icing system of the outdoor unit in the above embodiments of the present invention or the control method of the de-icing system of the outdoor unit in the above embodiments of the present invention.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ice melting system of an outdoor unit, characterized by, The application relates to a temperature monitoring device for an evaporator. The temperature monitoring device comprises a temperature monitoring assembly arranged on the evaporator and used for monitoring temperature values at different height positions of the evaporator; a controller connected with the temperature monitoring assembly and used for receiving the temperature values at the different height positions of the evaporator and obtaining a temperature value difference at the different height positions of the evaporator; and a heater connected with the controller in an electrical control mode. The controller is used for controlling the working state of the heater according to the size relation between the temperature value difference and a preset value. The control process is performed before icing starts or after heating lasts for a period of time. The temperature monitoring assembly comprises a plurality of temperature sensors arranged at different height positions of the evaporator in sequence. The temperature sensors comprise a first temperature sensor used for monitoring a temperature value at a first position of the evaporator; a second temperature sensor used for monitoring a temperature value at a second position of the evaporator; and a third temperature sensor used for monitoring a temperature value at a third position of the evaporator.

2. The ice melting system of an outdoor unit according to claim 1, wherein The first position, the second position and the third position form a height difference.

3. The ice melting system of an outdoor unit according to claim 2, wherein The heater comprises a water storage tank used for storing a heat exchange medium; a heat transfer unit arranged on an outdoor unit base plate and / or the evaporator and connected with the water storage tank; a circulating water pump arranged at a water outlet of the water storage tank and connected with the controller in an electrical control mode and used for controlling the working state of the circulating water pump; and a heating unit arranged between the circulating water pump and the heat transfer unit and used for heating the heat exchange medium. The heat transfer unit comprises a coil pipe. The application further relates to a temperature monitoring method for an evaporator. The method comprises the following steps: S1, obtaining temperature values at different height positions of the evaporator; S2, obtaining a temperature value difference at the different height positions of the evaporator and controlling the working state of a heater arranged on an outdoor unit according to the size relation between the temperature value difference and a preset value; and S3, performing the control process before icing starts or after heating lasts for a period of time. In step S1, the temperature values at the different height positions of the evaporator are obtained, and the method comprises the following steps: obtaining a first temperature value at a first position of the evaporator, a second temperature value at a second position of the evaporator and a third temperature value at a third position of the evaporator; and the first position, the second position and the third position form a height difference.

4. The ice melting system of an outdoor unit according to any one of claims 1 to 3, characterized in that, In step S2, the temperature value difference at the different height positions of the evaporator is obtained, and the working state of the heater arranged on the outdoor unit is controlled according to the size relation between the temperature value difference and a preset value. When the difference between the first temperature value and the second temperature value is less than or equal to a first preset value and the difference between the second temperature value and the third temperature value is less than or equal to a second preset value, the controller controls the heater to be closed. ​ ​ ​ 5. The ice melting system of an outdoor unit according to claim 4, wherein ​ 6. A control method of an ice melting system of an outdoor unit, characterized by, ​ ​ ​ ​ 7. The control method of the ice melting system according to claim 6, wherein ​ ​ ​ 8. The control method of the ice melting system according to claim 7, wherein ​ ​ When the difference between the first temperature value and the second temperature value is greater than the first preset value and / or when the difference between the second temperature value and the third temperature value is greater than the second preset value, the controller controls the heater to start and continuously heat the outdoor unit for a first set duration.

9. The control method of the ice melting system according to claim 8, wherein When the difference between the first temperature value and the second temperature value is greater than the first preset value and / or when the difference between the second temperature value and the third temperature value is greater than the second preset value, the controller controls the heater to start and continuously heat the outdoor unit for a first set duration, and further comprising: S3, if the difference between the first temperature value and the second temperature value is less than or equal to the first preset value, the controller controls the heater to start and continuously heat the outdoor unit for a second set duration; wherein, The first set duration is longer than the second set duration.

10. An air conditioner characterized by comprising: Comprising: The ice melting system of the outdoor unit or the control method of the ice melting system of the outdoor unit according to any one of claims 6 to 9. The ice melting system of the outdoor unit or the control method of the ice melting system of the outdoor unit according to any one of claims 6 to 9.

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