WO2023173788A1 - Air conditioner and defrosting control method thereof - Google Patents

Abstract

The present invention relates to the technical field of air conditioners, and aims to solve the problems that a defrosting starting control method of existing air conditioners is unreasonable, and frequently, defrosting is not performed while there is frost or defrosting is performed while there is no frost. The present invention provides an air conditioner and a defrosting control method thereof. A distance measuring device is provided at an air outlet of an indoor heat exchanger and used for measuring a distance between the distance measuring device and the surface of the indoor heat exchanger. The control method comprises: obtaining the distance between the distance measuring device and the surface of the indoor heat exchanger during refrigeration; selectively controlling the air conditioner to enter a defrosting mode according to the distance, and if the distance is smaller than a first preset distance, entering a first defrosting mode; if the distance is greater than or equal to the first preset distance and smaller than a second preset distance, obtaining an air outlet temperature at the air outlet; if the air outlet temperature is smaller than a first preset temperature and greater than or equal to a second preset temperature, entering a second defrosting mode; and if the air outlet temperature is smaller than the second preset temperature, entering a third defrosting mode, and performing targeted defrosting according to frosting thickness and the air outlet temperature, so that the defrosting starting control method is more reasonable.

Description

Air conditioner and defrost control method thereof Technical field

The present invention relates to the technical field of air conditioners, and specifically provides an air conditioner and a defrosting control method thereof.

Background technique

Normally, when the outdoor ambient temperature is high, the air conditioner will be controlled to operate in cooling mode to deliver cold air indoors and reduce the indoor temperature. When the existing air conditioner is in the cooling mode, moisture in the air condenses on the evaporator and frost forms. Since the frost will further hinder the air circulation and then freeze, the frost on the evaporator will easily affect the cooling effect. The existing solution is to reduce the compressor frequency based on the detected temperature on the evaporator coil to prevent the evaporator temperature from being too low (freeze protection), that is, when the evaporator temperature is below zero, the compressor is turned off so that the compressor Stop operation until the frost on the evaporator surface melts, and then restart refrigeration. However, this method of defrosting start control is unreasonable. It often happens that frost is not defrosted or there is no defrosting. For example, in practical applications, the evaporator is often frozen, but the temperature detected by the sensor is 7°C. The freezing protection conditions are not met, thus affecting the cooling effect of the air conditioner and reducing the user experience.

Accordingly, this field needs a new technical solution to solve the problems existing in the existing technology.

Contents of the invention

The present invention aims to solve the above technical problems, that is, to solve the problem that the defrosting start control method of the existing air conditioner is unreasonable and the problem of frost not being defrosted or frost-free defrosting often occurs.

The invention provides a defrosting control method for an air conditioner. The air conditioner includes an indoor heat exchanger and an air outlet that introduces the airflow flowing through the indoor heat exchanger into the room. The air outlet is provided with a distance measuring device. , the distance measuring device is used to detect the distance from the position facing the distance measuring device on the surface of the indoor heat exchanger, and the control method includes:

When the air conditioner is in cooling mode, obtain the distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger;

The air conditioner is selectively controlled to enter a defrost mode according to the distance.

Through the above defrost control method, when the air conditioner is in the cooling mode, in order to more accurately determine whether there is a frost layer on the indoor heat exchanger and whether it has reached the level that requires defrosting, the present invention is equipped with a device at the air outlet. There is a distance measuring device for detecting the distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger, so as to reliably estimate whether there is frost on the indoor heat exchanger of the air conditioner and its thickness based on the detected distance. , selectively controls the air conditioner to enter the defrost mode, avoiding judging whether the air conditioner is frosted only by detecting the temperature at the air outlet, so that the air conditioner can be defrosted in a timely and effective manner, and at the same time, the air conditioner's defrost start control The method is more reasonable and can avoid the situation where the air conditioner is not defrosted with frost or is defrosted without frost, improves the cooling effect of the air conditioner, and thus significantly improves the user experience and comfort.

In the preferred technical solution of the above control method, the step of "selectively controlling the air conditioner to enter the defrost mode according to the distance" includes:

If the distance is less than the first preset distance, the air conditioner is controlled to enter the first defrost mode.

Through the above defrost control method, the detected distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger is compared with the first preset distance. If the distance is less than the first preset distance, then It indicates that there is a frost layer on the surface of the indoor heat exchanger, and the air conditioner is controlled to enter the first defrost mode.

In the preferred technical solution of the above control method, the step of "selectively controlling the air conditioner to enter the defrost mode according to the distance" includes:

If the distance is greater than or equal to the first preset distance and less than the second preset distance, obtain the air outlet temperature at the air outlet;

The air conditioner is selectively controlled to enter a defrost mode according to the outlet air temperature.

Through the above defrost control method, if the detected distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger is greater than or equal to the first preset distance and less than the second preset distance, it indicates that the indoor heat exchanger If there are obstacles on the heater, the air temperature at the air outlet is further obtained, and based on the air outlet temperature, it is judged whether the obstacle is a frost layer. Based on the temperature of the air outlet, the air conditioner is selectively controlled to enter the defrost mode to avoid Dust is misjudged as a frost layer and defrosted, causing the air conditioner to defrost without frost. While detecting the distance between the surface of the indoor heat exchanger and the distance measuring device, the air conditioner at the air outlet is obtained. The wind temperature is comprehensively analyzed to determine whether the air conditioner is frosted and the degree of frost, thereby further improving the rationality and accuracy of the air conditioner's defrost start control method.

In the preferred technical solution of the above control method, the step of "selectively controlling the air conditioner to enter the defrost mode according to the outlet air temperature" includes:

If the outlet air temperature is lower than the first preset temperature, the air conditioner is controlled to enter the defrost mode.

Through the above defrost control method, the obtained air outlet temperature at the air outlet is compared with the first preset temperature. If the outlet air temperature is lower than the first preset temperature, it indicates that the obstacle on the indoor heat exchanger is frost. layer, thereby more accurately determining the timing of defrosting and controlling the air conditioner to enter defrost mode.

In the preferred technical solution of the above control method, the step of "selectively controlling the air conditioner to enter the defrost mode according to the outlet air temperature" includes:

If the outlet air temperature is not less than the first preset temperature, the air conditioner is controlled to enter a self-cleaning mode.

Through the above defrost control method, the obtained air outlet temperature at the air outlet is compared with the first preset temperature. If the outlet air temperature is not less than the first preset temperature, it indicates that the obstacle on the indoor heat exchanger is dust, and then controls the air conditioner to enter the self-cleaning mode, preventing the air conditioner from misjudging dust as a frost layer for defrosting, resulting in a waste of energy, and improving the intelligence of the air conditioner's defrost control and self-cleaning control.

In the preferred technical solution of the above control method, the step of "controlling the air conditioner to enter the defrost mode if the outlet air temperature is less than the first preset temperature" includes:

If the outlet air temperature is less than the first preset temperature and greater than or equal to the second preset temperature, control the air conditioner to enter the second defrost mode;

If the outlet air temperature is lower than the second preset temperature, the air conditioner is controlled to enter the third defrost mode.

Through the above defrost control method, the obtained air outlet temperature at the air outlet is compared with the first preset temperature and the second preset temperature, and the air conditioner is selectively controlled to enter the second defrost mode according to the different results of the comparison. Or the third defrost mode allows the air conditioner to select a defrost mode corresponding to the degree of frost and control the air conditioner to defrost, so that the air conditioner can adjust the defrost mode according to the actual frost degree of the indoor heat exchanger. Intelligent defrosting can be performed to reduce the number of defrosts and unnecessary defrosting consumption, and improve the user experience.

In the preferred technical solution of the above control method, the first defrost mode includes controlling the compressor and the external fan of the air conditioner to stop, and controlling the internal fan of the air conditioner to run at a first speed;

The second defrost mode includes controlling the compressor and the external fan of the air conditioner to stop, and controlling the internal fan of the air conditioner to operate at a second speed;

The third defrost mode includes controlling the compressor and the external fan of the air conditioner to stop, and controlling the internal fan of the air conditioner to operate at a third speed;

Wherein, the third rotation speed is greater than the second rotation speed and smaller than the first rotation speed.

Through the above defrost control method, when the air conditioner is defrosting, the compressor and the outdoor fan of the air conditioner are controlled to stop, which can prevent the indoor heat exchanger from continuing to frost and control the internal fan of the air conditioner to cool the indoor air at the preset speed. The frost is blown on the surface of the heater, so that the frost layer on the surface of the indoor heat exchanger accelerates to melt under the action of the wind of the internal fan. At the same time, the internal fan can use the low temperature of the frost layer to blow some cold air into the room, so that the air conditioner can be defrosted. At the same time, a certain cooling effect can be achieved, and the air conditioner can determine the indoor heat exchange based on the detected distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger and the air outlet temperature at the air outlet. According to the frost degree of the air conditioner, the internal fan is controlled to run at different speeds, so that the air conditioner can be defrosted in a targeted manner, further improving the intelligence of air conditioner defrost.

In a preferred technical solution of the above control method, after the air conditioner operates in the defrost mode for a first preset time period, the air conditioner is controlled to exit the defrost mode.

In the preferred technical solution of the above control method, the distance measuring device is an infrared distance sensor.

On the other hand, the present invention also provides an air conditioner, the air conditioner includes a memory and a processor, the memory stores a computer program, and the computer program is configured to be executed by the processor to implement the above technology. Defrost control method of air conditioner in the scheme.

It should be noted that this air conditioner has all the technical effects of the defrosting control method of the air conditioner described above, which will not be described again here.

Description of the drawings

The preferred embodiments of the present invention will be described below in conjunction with the accompanying drawings, in which:

Figure 1 is a flow chart of the defrost control method of the air conditioner of the present invention;

Figure 2 is a flow chart of a defrost control method for an air conditioner in an embodiment of the present invention.

Detailed ways

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Based on the fact that the defrosting start control method of the existing air conditioner mentioned in the background art is unreasonable, and the problem of frost not defrosting or no frost defrosting often occurs, the present invention provides an air conditioner and a defrosting control method thereof, aiming to It can more accurately determine whether the frost layer actually exists on the indoor heat exchanger and whether it has reached the level that requires defrosting, and selectively control the air conditioner to enter the defrost mode, so that the air conditioner can be defrosted in a timely and effective manner, and at the same time, The defrost start control method of the air conditioner is more reasonable, which can prevent the air conditioner from being defrosted or defrosted without frost, thereby significantly improving the user experience and comfort.

The defrosting control method of the air conditioner of the present invention will be described in detail below with reference to FIGS. 1 and 2 . Among them, FIG. 1 is a flow chart of the defrost control method of the air conditioner of the present invention; FIG. 2 is a flow chart of the defrost control method of the air conditioner in an embodiment of the present invention.

The air conditioner of the present invention mainly includes an air conditioner outdoor unit and an air conditioner indoor unit. The air conditioner outdoor unit is equipped with a compressor and an outdoor fan. The air conditioner indoor unit includes an indoor heat exchanger and an indoor fan. The air conditioner indoor unit also includes an indoor heat exchanger that flows through the room. The airflow is introduced into the indoor air outlet. Driven by the indoor fan, the airflow enters the indoor unit and is cooled by the indoor heat exchanger before being blown out through the air outlet. A distance measuring device is provided at the air outlet, and the distance measuring device is used to detect the distance from the position facing the distance measuring device on the surface of the indoor heat exchanger. The air conditioner includes a memory and a processor. The air conditioner of the present invention may be a split air conditioner or an integrated air conditioner.

Specifically, as shown in Figure 1, the defrost control method of the present invention includes the following steps:

Step S10: When the air conditioner is in the cooling mode, obtain the distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger;

In step S10, the indoor heat exchanger is a fin-type coil heat exchanger, including multiple fins covered with hairpin tubes. The distance measuring device can be a laser distance sensor or an infrared distance sensor. Since the air outlet The temperature is the lowest at the air outlet, and the fins at the air outlet are most likely to frost. Therefore, the distance measuring device is set on the fin close to the air outlet, and the distance between the position on the fin facing the distance measuring device and the distance measuring device can be detected. , thereby judging whether there is a frost layer on the fins through distance.

Step S11: If the distance is less than the first preset distance, control the air conditioner to enter the first defrost mode;

In step S11, the first preset distance can be set in the range of 0.5 to 1 mm. When the distance is smaller than the first preset distance, it indicates that the frost on the fins is severe, and the air conditioner is controlled to execute the first defrost mode.

The first defrost mode specifically controls the compressor and the external fan of the air conditioner to stop, and controls the internal fan of the air conditioner to run at a first speed, and the first speed can be set to 1100-1200 rpm.

Step S12: If the distance is greater than or equal to the first preset distance and less than the second preset distance, obtain the air outlet temperature at the air outlet;

In step S12, at least one temperature sensor for detecting fin temperature is provided at the air outlet of the indoor heat exchanger. The second preset distance can be set in the range of 1 to 1.5 mm. When the distance is greater than or equal to the first preset distance, When the distance is set and is less than the second preset distance, it is impossible to determine whether the obstacle on the fin is frost layer or dust. The temperature sensor can also be used to further obtain the air outlet temperature at the air outlet for subsequent judgment.

Step S121: If the outlet air temperature is less than the first preset temperature and greater than or equal to the second preset temperature, control the air conditioner to enter the second defrost mode;

In step S121, the first preset temperature can be set in the range of 0 to 5°C. When the outlet air temperature is lower than the first preset temperature, the temperature on the current fins on the surface is low, and it can be judged that frost is forming on the current fins. , and then controls the air conditioner to enter defrost mode.

The second preset temperature can be set in the range of -5 to 0°C. When the outlet air temperature is less than the first preset temperature and greater than or equal to the second preset temperature, it indicates that the temperature on the current fin is lower, thereby judging that the current fin Frost is forming on the chip, and the air conditioner is controlled to enter the second defrost mode, that is, the compressor and the external fan of the air conditioner are controlled to stop, and the internal fan of the air conditioner is controlled to run at the second speed. The second speed can be set to 800 to 900 rpm.

The climate temperatures in different regions are also quite different, especially the summer temperature difference between the north and the south is very large, and the temperature difference between day and night is also large. For example, in some southern areas, the average outdoor temperature in summer is not higher than 30℃, while in some northern areas, the average outdoor temperature in summer is The temperature is close to 40℃.

In view of this, the present invention differentiates according to the environment of the cooling season in the area where the air conditioner is located, and can provide appropriate first preset temperatures for the ambient temperatures in different areas, thereby improving the accuracy of judgment of defrosting timing.

Step S122: If the outlet air temperature is lower than the second preset temperature, control the air conditioner to enter the third defrost mode;

In step S122, when the outlet air temperature is lower than the second preset temperature, it indicates that the temperature on the current fins is very low and the frost on the current fins is relatively serious. The air conditioner is controlled to enter the third defrost mode, that is, the air conditioner is controlled. The compressor and external fan are stopped, and the internal fan of the air conditioner is controlled to run at the third speed.

The third rotation speed can be set to 900~1100rpm.

Step S123: If the outlet air temperature is not less than the first preset temperature, control the air conditioner to enter the self-cleaning mode;

In step S123, when the outlet air temperature is greater than or equal to the first preset temperature, it indicates that although there are obstacles on the current fins, the temperature of the fins has not dropped. Therefore, it is determined that the obstacles on the current fins are dust, and the air conditioner is controlled. Execute self-cleaning mode.

Step S20: After the air conditioner runs the defrost mode for a first preset time period, control the air conditioner to exit the defrost mode.

In step S20, the first preset time period is a value preset by the system, which can be any value within the range of 10 to 60 minutes. If the compressor and external fan are turned off for a long time and only the internal fan is turned on, the indoor ambient temperature will be high and the user's experience will be affected. Therefore, the running time of the defrost mode of the air conditioner can be adjusted to a fixed value according to actual usage habits. For example, the first preset time can be set to 20 minutes, 30 minutes, etc.

In the above step S20, the running time of the defrost mode can also be controlled differently according to the specific degree of frost. For example, in a feasible embodiment, when the current defrost mode is the first defrost mode, the internal fan can be controlled. Run at the first speed for 30 minutes; when the current defrost mode is the second defrost mode, the internal fan can be controlled to run at the second speed for 10 minutes; when the current defrost mode is the third defrost mode, the internal fan can be controlled Run at third speed for 20 minutes.

After the operation of step S20 is completed, the distance between the fins at the air outlet and the distance measuring device can also be re-detected using the distance measuring device to determine whether the frost layer on the indoor heat exchanger has been completely removed, which can avoid indoor The frost on the heat exchanger has not been completely removed and the air conditioner has exited the defrost mode.

Through the defrosting control method of the air conditioner described above, when the air conditioner is in the cooling mode, the distance measuring device provided at the air outlet can be used to detect the distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger. Therefore, it can be reliably estimated based on the detected distance whether there is frost on the fins at the air outlet and the thickness of the frost.

If the distance exceeds the first preset distance, it indicates that the frost layer is very thick, and the frost on the fins at the air outlet is judged to be serious. At this time, there is no need to obtain the fin temperature, and the air conditioner can be directly controlled to execute the first defrost mode;

If the distance is greater than or equal to the first preset distance and less than the second preset distance, the current fin temperature is obtained. When the fin temperature is the first preset temperature and greater than or equal to the second preset temperature, it is determined that the temperature on the fin at the air outlet is If the frost is not too severe and the frost layer is not very thick, control the air conditioner to execute the second defrost mode;

If the current fin temperature is less than the second preset temperature, indicating that the current fin frost is serious, the air conditioner is controlled to enter the third defrost mode. This enables the air conditioner to judge based on the current condition of the indoor heat exchanger surface and the fin temperature at the air outlet, thereby making the defrost start control method more reasonable and the air conditioner able to defrost in a timely and effective manner.

In a possible implementation, the defrosting control method of the above-mentioned air conditioner can also be adjusted to only detect the distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger, and selectively control the distance based on the distance. The air conditioner enters the defrost mode. If the distance is less than the first preset distance, the air conditioner is controlled to enter the first defrost mode; if the distance is not less than the first preset distance, it indicates that the current indoor heat exchanger is not frosted or frosted. If the degree of frost is not severe, defrosting is not required.

The running time of the defrost mode can be determined according to the degree of frost and defrost conditions of the air conditioner.

In one embodiment, the distance measuring device uses an infrared distance sensor, which is fixed on the fins at the air outlet. The infrared distance sensor can detect frost on the surface of the fins at the air outlet.

Specifically, as shown in Figure 2, the defrost control method of the present invention includes the following steps:

Step S10: When the air conditioner is in cooling mode, obtain the distance between the infrared distance sensor and the fins at the air outlet;

Step S11: If the distance is less than 1mm, control the air conditioner to enter the first defrost mode;

In step S11, the first defrost mode is entered, that is, the compressor and the external fan of the air conditioner are controlled to stop, and the internal fan of the air conditioner is controlled to run at 1200 rpm. That is to say, when the frost layer is thick, the infrared distance sensor and If the distance between the fins at the air outlet is less than 1mm, the current degree of frost is judged to be severe frost. When running the first defrost mode, the air conditioner stops cooling for a period of time, and the indoor unit of the air conditioner is rotated at high speed to achieve defrosting. Frost purpose.

Step S12: If the distance is greater than or equal to 1mm and less than 1.5mm, obtain the air outlet temperature at the air outlet;

Specifically, a temperature sensor is provided on the fins at the air outlet, and the temperature sensor is used to detect the real-time temperature of the fins at the air outlet.

The temperature sensor can continuously detect the current fin temperature at the air outlet, and send the measured temperatures to the memory of the air conditioner for further calculation and processing. The final current fin temperature is the average of the temperatures measured by the temperature sensor. Or the lowest value.

The outlet air temperature in step S12 is the lowest value of multiple current fin temperatures.

Step S121: If the outlet air temperature is less than 3°C and greater than or equal to 0°C, control the air conditioner to enter the second defrost mode;

In step S121, 3°C and 0°C are only exemplary and do not limit the scope of the present invention. In practical applications, users can flexibly set them according to different defrosting requirements. When the outlet air temperature is less than 3°C and greater than or equal to 0°C, the current degree of frost is judged to be primary frost, and the air conditioner is controlled to enter the second defrost mode, that is, the compressor and outdoor fan of the air conditioner are controlled to stop, and the air conditioner is controlled. The internal fan of the device runs at 800rpm;

Step S122: If the outlet air temperature is less than 0°C, control the air conditioner to enter the third defrost mode;

In step S122, when the outlet air temperature is less than 0°C, it is determined that the current degree of frost is intermediate frost, and the air conditioner is controlled to enter the third defrost mode, that is, the compressor and the outdoor fan of the air conditioner are controlled to stop, and the air conditioner is controlled. The internal fan of the device runs at 1000rpm;

Step S123: If the outlet air temperature is not less than 3°C, control the air conditioner to enter the self-cleaning mode;

Step S20: After the air conditioner runs in the defrost mode for 30 minutes, control the air conditioner to exit the defrost mode.

To sum up, the defrost control method of the air conditioner of the present invention measures the distance between the indoor heat exchanger and the distance measuring device and obtains the air outlet temperature at the air outlet to make a comprehensive judgment to determine whether the air conditioner performs defrost. The mode sets more precise judgment conditions. It does not only rely on detecting the air temperature at the air outlet to judge whether the air conditioner is frosted, so that it can accurately determine the timing of the air conditioner entering the defrost mode and avoid frost as much as possible. The occurrence of no defrosting or no frost ensures the timeliness and effectiveness of air conditioner defrosting.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings. However, those skilled in the art can easily understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or replacements to relevant technical features, and technical solutions after these changes or replacements will fall within the protection scope of the present invention.

Claims (10)

1. A defrosting control method for an air conditioner, characterized in that the air conditioner includes an indoor heat exchanger and an air outlet that introduces the airflow flowing through the indoor heat exchanger into the room, and a distance measuring device is provided at the air outlet. Device, the distance measuring device is used to detect the distance from the position facing the distance measuring device on the surface of the indoor heat exchanger,

   The control methods include:

   When the air conditioner is in cooling mode, obtain the distance between the distance measuring device and the position facing the distance measuring device on the surface of the indoor heat exchanger;

   The air conditioner is selectively controlled to enter a defrost mode according to the distance.
2. The defrost control method according to claim 1, wherein the step of "selectively controlling the air conditioner to enter the defrost mode according to the distance" includes:

   If the distance is less than the first preset distance, the air conditioner is controlled to enter the first defrost mode.
3. The defrost control method according to claim 2, wherein the step of "selectively controlling the air conditioner to enter the defrost mode according to the distance" includes:

   If the distance is greater than or equal to the first preset distance and less than the second preset distance, obtain the air outlet temperature at the air outlet;

   The air conditioner is selectively controlled to enter a defrost mode according to the outlet air temperature.
4. The defrost control method according to claim 3, characterized in that the step of "selectively controlling the air conditioner to enter the defrost mode according to the outlet air temperature" includes:

   If the outlet air temperature is lower than the first preset temperature, the air conditioner is controlled to enter the defrost mode.
5. The defrost control method according to claim 4, characterized in that the step of "selectively controlling the air conditioner to enter the defrost mode according to the outlet air temperature" includes:

   If the outlet air temperature is not less than the first preset temperature, the air conditioner is controlled to enter a self-cleaning mode.
6. The defrost control method according to claim 4, wherein the step of "controlling the air conditioner to enter the defrost mode if the outlet air temperature is lower than the first preset temperature" includes:

   If the outlet air temperature is less than the first preset temperature and greater than or equal to the second preset temperature, control the air conditioner to enter the second defrost mode;

   If the outlet air temperature is lower than the second preset temperature, the air conditioner is controlled to enter the third defrost mode.
7. The defrosting control method according to claim 6, wherein the first defrosting mode includes controlling the compressor and the external fan of the air conditioner to stop, and controlling the internal fan of the air conditioner to rotate at a first speed. run;

   The second defrost mode includes controlling the compressor and the external fan of the air conditioner to stop, and controlling the internal fan of the air conditioner to operate at a second speed;

   The third defrost mode includes controlling the compressor and the external fan of the air conditioner to stop, and controlling the internal fan of the air conditioner to operate at a third speed;

   Wherein, the third rotation speed is greater than the second rotation speed and smaller than the first rotation speed.
8. The defrost control method according to any one of claims 2 to 7, characterized in that after the air conditioner operates in the defrost mode for a first preset time period, the air conditioner is controlled to exit the defrost mode.
9. The defrost control method according to any one of claims 1 to 7, characterized in that the distance measuring device is an infrared distance sensor.
10. An air conditioner, characterized in that the air conditioner includes a memory and a processor, the memory stores a computer program, and the computer program is configured to be executed by the processor to implement any one of claims 1 to 9 The defrosting control method of the air conditioner described in the item.

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