System for defrosting and air conditioner

Abstract

The application relates to the air conditioning technical field, and discloses a system for defrosting, which comprises a frosting detection device and a controller. The frosting detection device is electrically connected with the controller and is used for detecting frosting conditions of a heat exchanger and sending the frosting conditions to the controller. The controller is electrically connected with an external defrosting device, and is used for triggering the external defrosting device to heat the heat exchanger when the frosting conditions are frosting conditions of the heat exchanger. The external defrosting device is arranged on the heat exchanger and is used for heating the heat exchanger. In this way, the heat exchanger surface can be heated, so that the frost on the heat exchanger is melted. Since there is no refrigerant flow reversal during the defrosting process, it is not necessary to reestablish the balance, so that the probability of indoor temperature fluctuation can be reduced. The application further discloses an air conditioner.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, for example, relates to a system for defrosting and air conditioner. BACKGROUND

[0002] At present, when the air conditioner is in heating operation in winter, the outdoor heat exchanger is surrounded by low-temperature air due to the heat absorbed from the outdoor air by the outdoor unit of the air conditioner, and the water vapor in the air will condense into frost and adhere to the surface of the outdoor heat exchanger. Thick frost will reduce the heat exchange capacity of the air conditioner outdoor unit, thereby reducing the heating efficiency of the air conditioner. The existing technology is to switch the operation state of the air conditioner to the refrigeration cycle mode, so that the high-temperature and high-pressure refrigerant discharged by the compressor is discharged into the air conditioner outdoor unit through the four-way reversing valve to melt the frost layer on the air conditioner outdoor unit.

[0003] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0004] Due to the switching of the air conditioner from the heating cycle to the refrigeration cycle during the defrosting process, the indoor temperature fluctuates greatly, resulting in poor air conditioner experience.

[0005] It should be noted that the information disclosed in the above BACKGROUND section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0006] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important elements or delineate the scope of protection of these embodiments, but as a prelude to the detailed description below.

[0007] The embodiments of the present disclosure provide a system for defrosting and an air conditioner, which can reduce the probability of indoor temperature fluctuation during air conditioner defrosting.

[0008] In some embodiments, the system for defrosting comprises: a frost detection device electrically connected to a controller, the frost detection device being configured to detect and send the frost condition of the heat exchanger to the controller; the controller being electrically connected to an external defrosting device, the controller being configured to trigger the external defrosting device to heat the heat exchanger when the frost condition is that the heat exchanger is frosted; and the external defrosting device being arranged on the heat exchanger and being configured to heat the heat exchanger.

[0009] In some embodiments, the system for defrosting comprises a frost layer thickness detection device electrically connected to a controller, the frost layer thickness detection device being configured to detect and send the frost layer thickness on the heat exchanger to the controller.

[0010] In some embodiments, the controller is further configured to trigger the frost thickness detection device to detect the frost thickness on the heat exchanger when the frosting condition is that the heat exchanger is frosted.

[0011] In some embodiments, the controller is further configured to determine the heating temperature according to the frost thickness, and trigger the external defrosting device to heat the heat exchanger according to the heating temperature.

[0012] In some embodiments, the controller is configured to determine the heating temperature according to the frost thickness by: determining a temperature correction value according to a first difference between the frost thickness and a preset first thickness threshold; and correcting a preset initial temperature by using the temperature correction value to obtain the heating temperature.

[0013] In some embodiments, the controller is configured to determine the temperature correction value according to the first difference between the frost thickness and the preset first thickness threshold by: determining the temperature correction value as 0 when the first difference between the frost thickness and the preset first thickness threshold is less than or equal to 0; and / or determining the temperature correction value as a product between the first difference and a preset correction value when the first difference between the frost thickness and the preset first thickness threshold is greater than 0.

[0014] In some embodiments, the system for defrosting further comprises: an external fan electrically connected to the controller, the external fan being arranged at a rear portion of the outdoor unit.

[0015] In some embodiments, the controller is further configured to determine a target rotating speed according to the frost thickness, and trigger the external fan to rotate at the target rotating speed.

[0016] In some embodiments, the system for defrosting further comprises: a temperature detection device electrically connected to the controller, the temperature detection device being configured to detect and send an outdoor environment temperature to the controller; and a humidity detection device electrically connected to the controller, the humidity detection device being configured to detect and send an outdoor environment humidity to the controller.

[0017] In some embodiments, the controller is further configured to trigger the frosting detection device to detect the frosting condition of the heat exchanger when the outdoor environment temperature is less than a set temperature and the outdoor environment humidity is less than a set humidity.

[0018] The system for defrosting and the air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects: the frosting condition of the heat exchanger is detected by using the frosting detection device, and the external defrosting device arranged on the heat exchanger is controlled by the controller to heat the heat exchanger when the heat exchanger is frosted, so that direct heating of the frost layer on the outer surface of the heat exchanger can be achieved. Since there is no refrigerant flow reversal during the defrosting process, it is not necessary to re-establish the balance, so that the probability of indoor temperature fluctuation can be reduced.

[0019] The foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are illustrated by way of example in the figures that are not intended to be limiting of the application as defined by the claims. The drawings show, by way of example, embodiments in which the principles of the present application can be applied. Like reference numerals and characters

[0021] Figure 1 is a schematic diagram of a system for defrosting provided by an embodiment of the present disclosure;

[0022] Figure 2 is a schematic diagram of another system for defrosting provided by an embodiment of the present disclosure;

[0023] Figure 3 is a schematic diagram of another system for defrosting provided by an embodiment of the present disclosure;

[0024] Figure 4 is a schematic diagram of another system for defrosting provided by an embodiment of the present disclosure;

[0025] Figure 5 is a schematic diagram of an air conditioner provided by an embodiment of the present disclosure;

[0026] Figure 6 is a schematic diagram of another air conditioner provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] In order to enable every detail of the present application to be understood, the following detailed description is provided. The accompanying drawings are used to illustrate the present application and are not intended to limit the present application. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, one or more embodiments can be practiced without these specific details. In other instances, well-known structures and devices are not shown or described in detail in order to avoid obscuring the present application.

[0028] The terms "first", "second", and the like, as used in the description and the claims of this disclosure and the preceding drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so construed can interchange depending on the context in which they are used. Furthermore, the terms "comprising", "including", "containing", and "having" and any variations thereof, are intended to cover a non-exclusive inclusion.

[0029] Unless otherwise defined, the term "plurality" means two or more.

[0030] In the embodiments of the present disclosure, the character " / " represents an "or" relationship between the preceding and following objects. For example, A / B means A or B.

[0031] The term "and / or" is a description of the association relationship between objects, which means that there can be three relationships. For example, A and / or B means that there are three relationships of A or B, or A and B.

[0032] The term "corresponding" can refer to an association relationship or a binding relationship. A corresponds to B means that there is an association relationship or a binding relationship between A and B.

[0033] In combination Figure 1 As shown, the embodiments of the present disclosure provide a system 100 for defrosting, comprising a frost detection device 101, a controller 102 and an external defrosting device 103. The frost detection device 101 is electrically connected to the controller 102, and the frost detection device 101 is used to detect and send the frost condition of the heat exchanger to the controller 102. The frost condition is used to represent whether the heat exchanger is frosted or not. The controller 102 is electrically connected to the external defrosting device 103, and the controller 102 is used to trigger the external defrosting device 103 to heat the heat exchanger when the frost condition is that the heat exchanger is frosted. The external defrosting device 103 is used to heat the heat exchanger.

[0034] By using the system for defrosting provided by the embodiments of the present disclosure, the frost condition of the heat exchanger is detected by using the frost detection device, and the external defrosting device provided on the heat exchanger is controlled to heat the heat exchanger by using the controller when the heat exchanger is frosted, so that direct heating of the frost layer on the outer surface of the heat exchanger can be realized. Since there is no refrigerant flow reversal during the defrosting process, it is not necessary to reestablish the balance, so as to reduce the probability of indoor temperature fluctuation.

[0035] Optionally, the external defrosting device is an electric heating device.

[0036] Further, the frost detection device 101 is arranged on the heat exchanger of the air conditioner, and the frost detection device detects the frost condition of the heat exchanger every interval of a preset time period when receiving the frost detection instruction sent by the controller. The heat exchanger is arranged in the outdoor unit of the air conditioner. The frost detection device is, for example, a frost detection sensor.

[0037] In combination Figure 2As shown, the defrosting system 100 also includes a frost thickness detection device 104. The frost thickness detection device 104 is disposed on the heat exchanger and electrically connected to the controller 102. The frost thickness detection device 104 is used to detect and transmit the frost thickness on the heat exchanger to the controller 102. In some embodiments, the frost thickness detection device is an ultrasonic thickness gauge. Upon receiving a thickness detection command from the controller, the frost thickness detection device detects the frost thickness on the heat exchanger. Further, when the heat exchanger is frosted, the controller sends a thickness detection command to the frost thickness detection device, triggering the frost thickness detection device to detect the frost thickness on the heat exchanger.

[0038] Furthermore, the controller also determines the interval based on the frost thickness and triggers the frost detection device to monitor the frost condition of the heat exchanger in real time after the interval is reached. If the heat exchanger is not frosted, the external defrosting device is shut down. Since a thicker frost layer usually corresponds to a longer defrosting time, it is unnecessary to detect the frost thickness when it is known that the frost layer on the heat exchanger is thick. Therefore, determining the interval based on the frost thickness and monitoring the frost condition of the heat exchanger only after the interval is reached reduces unnecessary detection steps, thereby saving energy.

[0039] Optionally, determining the interval based on the frost thickness includes: matching the interval corresponding to the frost thickness in a preset database. The database stores the correspondence between frost thickness and interval.

[0040] In some embodiments, when the frost thickness is less than or equal to 1 mm, the interval corresponding to the frost thickness is 10 minutes. When the frost thickness is greater than 1 mm but less than or equal to 5 mm, the interval corresponding to the frost thickness is 20 minutes. When the frost thickness is greater than 5 mm, the interval corresponding to the frost thickness is 30 minutes.

[0041] Optionally, combined Figure 3 As shown, the defrosting system 100 also includes a frost image acquisition device 105, which is electrically connected to the controller 102. The frost image acquisition device 105 is used to acquire image information of the heat exchanger. Further, upon receiving a frost thickness acquisition command from the controller, the frost image acquisition device acquires image information of the heat exchanger. Further, when the heat exchanger is frosted, the controller sends a frost thickness acquisition command to the frost image acquisition device to trigger the frost image acquisition device to return image information of the heat exchanger. Further, the controller is also used to input the image information into a preset frost thickness recognition model to obtain the frost thickness of the heat exchanger.

[0042] Optionally, the controller is further configured to determine the heating temperature according to the frost thickness, and trigger the external defrosting device to heat the heat exchanger according to the heating temperature.

[0043] Further, the controller is configured to determine the heating temperature according to the frost thickness by: determining a temperature correction value according to a first difference between the frost thickness and a preset first thickness threshold; and correcting the preset initial temperature by using the temperature correction value to obtain the heating temperature.

[0044] Optionally, determining the temperature correction value according to the first difference between the frost thickness and the preset first thickness threshold comprises: in a case where the first difference between the frost thickness and the preset first thickness threshold is less than or equal to 0, determining the temperature correction value as 0; and / or in a case where the first difference between the frost thickness and the preset first thickness threshold is greater than 0, determining the temperature correction value as a product between the first difference and a preset correction value.

[0045] In some embodiments, the first difference between the frost thickness and the preset first thickness threshold is obtained by subtracting the preset first thickness threshold from the frost thickness.

[0046] In some embodiments, the preset first thickness threshold is 2 mm, the preset initial temperature is 100 degrees Celsius, and the preset correction value is 100 degrees Celsius. In a case where the first difference between the frost thickness and the preset first thickness threshold is less than or equal to 0, i.e., in a case where the frost thickness is less than or equal to 2 mm, the temperature correction value is determined as 0, and the heating temperature is directly determined as 100 degrees Celsius. In a case where the first difference between the frost thickness and the preset first thickness threshold is greater than 0, i.e., in a case where the frost thickness is greater than 2 mm, the temperature correction value is determined as a product between the first difference and the preset correction value. That is, in a case where the frost thickness increases by 1 mm, the temperature of the infrared heating pipe is increased by 100 degrees Celsius.

[0047] Optionally, the correcting the preset initial temperature by using the temperature correction value to obtain the heating temperature comprises: determining a sum between the temperature correction value and the initial temperature as the heating temperature.

[0048] Optionally, the system for defrosting further comprises an external fan electrically connected to the controller, the external fan being arranged at a rear portion of the air conditioner outdoor unit. Further, the external fan is configured to rotate at a target rotating speed in a case where the target rotating speed is received from the controller. In this way, the air circulation speed can be accelerated, thereby accelerating the defrosting efficiency. The controller is configured to determine the target rotating speed according to the frost thickness. The external fan is coaxially connected to an internal fan of the air conditioner.

[0049] Optionally, the controller is further configured to determine the target rotating speed according to the frost thickness, and trigger the external fan to rotate at the target rotating speed.

[0050] Further, the target rotating speed of the external fan is determined according to the frost thickness, including: in a case that the frost thickness is less than a preset second thickness threshold, determining the target rotating speed of the external fan as 0. And / or, in a case that the frost thickness is greater than or equal to the second thickness threshold, obtaining a second difference value between the frost thickness and the second thickness threshold, and calculating the target rotating speed according to a preset algorithm using the second difference value. Wherein, the first thickness threshold is less than the second thickness threshold. In this way, in a case that the frost thickness is greater than the second thickness threshold, not only the external defrosting device is controlled to heat the heat exchanger, but also the external fan is controlled to rotate, so as to accelerate the air flow speed around the heat exchanger, thereby accelerating the defrosting.

[0051] Optionally, the target rotating speed is obtained by calculating according to the preset algorithm using the second difference value, including: F = n x 2 x R1 + R2. Wherein, F is the target rotating speed, n is the second difference value, R1 is a preset rotating speed correction value, and R2 is a preset initial rotating speed.

[0052] In some embodiments, the second thickness threshold is 10 millimeters. The rotating speed correction value is 200 revolutions per minute. The initial rotating speed is 600 revolutions per minute. The target rotating speed is less than or equal to 2000 revolutions per minute.

[0053] Optionally, after the controller triggers the external defrosting device to heat the heat exchanger, the method further includes: in a case that the heat exchanger is not frosted, the controller controls the external defrosting device to be closed.

[0054] Optionally, the method further includes: Figure 4 As shown in FIG. 1, the system 100 for defrosting further includes a temperature detection device 106 and a humidity detection device 107. The temperature detection device 106 is electrically connected with the controller 102, and the temperature detection device 106 is configured to detect and send an outdoor environment temperature to the controller 102. The humidity detection device 107 is electrically connected with the controller 102, and the humidity detection device 107 is configured to detect and send an outdoor environment humidity to the controller 102. The outdoor environment temperature is the temperature of the area where the air conditioner outdoor unit is located. The outdoor environment humidity is the humidity of the area where the air conditioner outdoor unit is located.

[0055] Optionally, the controller is further configured to send a frost detection instruction to the frost detection device in a case that the outdoor environment temperature is less than a preset temperature and the outdoor environment humidity is less than a preset humidity. When the air conditioner is running in the heating mode, the outdoor heat exchanger of the air conditioner absorbs heat in the air to reduce the surface temperature of the outdoor heat exchanger. At this time, if the outdoor environment temperature is low and the outdoor environment humidity is large, the surface of the outdoor heat exchanger is prone to frost. Therefore, by obtaining the frost condition of the heat exchanger in a case that the outdoor environment temperature is less than a preset temperature and the outdoor environment humidity is less than a preset humidity, unnecessary detection steps can be reduced.

[0056] Further, the system for defrosting further comprises a first heat exchange device 108 and a second heat exchange device 109. The first heat exchange device 108 is connected with the second heat exchange device 109, and the first heat exchange device 108 is configured to exchange heat between the high-temperature and high-pressure refrigerant and the intermediate medium in the second heat exchange device 109. The second heat exchange device 109 stores the intermediate medium, and the second heat exchange device 109 is configured to defrost the heat exchanger by using the intermediate medium.

[0057] The embodiment of the present disclosure provides an air conditioner, which comprises the system for defrosting.

[0058] In combination with Figure 5 As shown in the drawings, the embodiment of the present disclosure provides an air conditioner 200, which comprises a frost detection device 101, a controller 102, an external defrosting device 103, and a heat exchanger 110. The frost detection device 101 is electrically connected with the controller 102, and the frost detection device 101 is configured to detect and send the frost condition of the heat exchanger 110 to the controller 102. The controller 102 is electrically connected with the external defrosting device 103, and the controller 102 is configured to trigger the external defrosting device 103 to heat the heat exchanger 110 when the frost condition is that the heat exchanger is frosted. The external defrosting device 103 is configured to heat the heat exchanger 110. The frost detection device 101 and the external defrosting device 103 are both arranged on the heat exchanger 110.

[0059] By using the air conditioner provided by the embodiment of the present disclosure, the frost condition of the heat exchanger is detected by using the frost detection device, and the external defrosting device arranged on the heat exchanger is controlled to heat the heat exchanger by using the controller when the heat exchanger is frosted, so that the direct heating of the frost layer on the outer surface of the heat exchanger can be realized. Since there is no refrigerant flow reversal during the defrosting process, it is not necessary to re-establish the balance, so that the probability of indoor temperature fluctuation can be reduced. Further, the experience of using the air conditioner by the user can be provided.

[0060] In combination with Figure 6 As shown in the drawings, the embodiment of the present disclosure provides an air conditioner 200, which comprises a compressor 201, a first heat exchange device 202, a second heat exchange device 203, and a heat exchanger 204. The compressor 201 is configured to deliver the refrigerant to the first heat exchange device 202 when operating, and receive the refrigerant flowing out of the first heat exchange device 202. The first heat exchange device 202 is connected with the second heat exchange device 203, and the first heat exchange device 202 is configured to exchange heat between the refrigerant and the intermediate medium in the second heat exchange device 203. The second heat exchange device 203 is arranged on the heat exchanger 204, the second heat exchange device 203 stores the intermediate medium, and the second heat exchange device 203 is configured to defrost the heat exchanger 204 by using the intermediate medium.

[0061] The air conditioner provided by the embodiment of the present disclosure is used to flow the refrigerant discharged by the compressor into the first heat exchange device to exchange heat with the intermediate medium in the second heat exchange device. Since the second heat exchange device is arranged on the heat exchanger, and the refrigerant discharged from the compressor is a high-temperature and high-pressure gas. Therefore, when the refrigerant flows into the first heat exchange device from the air conditioner, the temperature of the intermediate medium in the second heat exchange device will rise, thereby achieving the effect of heating and defrosting the surface of the heat exchanger. In this process, the defrosting effect can be achieved without switching the operating state of the air conditioner, thereby reducing the fluctuation of the indoor temperature and improving the user experience of using the air conditioner.

[0062] The technical scheme of the embodiment of the present disclosure can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes one or more instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium can be a non-transitory storage medium, including a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes, or can be a transitory storage medium.

[0063] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0064] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0065] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to apparatuses, devices, etc.) can be implemented in other manners. For example, the described apparatus embodiments are merely schematic. For example, the division of the units is merely a logical function division. There can be another division manner for the actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between different units, or among them, can be indirect couplings or communication connections through some interfaces, devices, or units, and can be in electric, mechanical, or other forms.

[0066] The flowcharts and block diagrams in the drawings show the possible implementation architectures, functions, and operations of the system, method, and computer program product according to the embodiments of the present disclosure. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment, or a part of code, which contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions noted in the blocks can occur in an order different from that noted in the drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the drawings, the operations or steps corresponding to different blocks can also occur in an order different from that disclosed in the descriptions, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved. Each block in the block diagrams and / or flowcharts, and the combination of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A system for defrosting, characterized by, The system comprises: a frost detection device electrically connected to the controller, the frost detection device being configured to detect and send a frost condition of the heat exchanger to the controller; the controller being electrically connected to the external defrosting device, the controller being configured to trigger the external defrosting device to heat the heat exchanger when the frost condition is that the heat exchanger is frosted; the external defrosting device being arranged on the heat exchanger and configured to heat the heat exchanger. The interval time is determined according to the frost thickness, and the frost condition of the heat exchanger is monitored in real time after the interval time is reached. When the heat exchanger is not frosted, the heating device is controlled to be turned off. The thicker the frost thickness, the longer the interval time corresponding to the frost thickness.

2. The system of claim 1, wherein, The system further comprises: a frost thickness detection device electrically connected to the controller, the frost thickness detection device being configured to detect and send the frost thickness of the heat exchanger to the controller.

3. The system of claim 2, wherein, The controller is further configured to trigger the frost thickness detection device to detect the frost thickness on the heat exchanger when the frost condition is that the heat exchanger is frosted.

4. The system of claim 2, wherein, The controller is further configured to determine a heating temperature according to the frost thickness and trigger the external defrosting device to heat the heat exchanger according to the heating temperature.

5. The system of claim 4, wherein, The controller determines the heating temperature according to the frost thickness by the following way: determining a temperature correction value according to a first difference between the frost thickness and a preset first thickness threshold value; correcting a preset initial temperature by using the temperature correction value to obtain the heating temperature.

6. The system of claim 2, wherein, The system further comprises: an external fan electrically connected to the controller, the external fan being arranged at the rear of the air conditioner outdoor unit.

7. The system of claim 6, wherein, The controller is further configured to determine a target rotating speed according to the frost thickness and trigger the external fan to rotate at the target rotating speed.

8. The system of claim 1, wherein, The system further comprises: a temperature detection device electrically connected to the controller, the temperature detection device being configured to detect and send an outdoor environment temperature to the controller; a humidity detection device electrically connected to the controller, the humidity detection device being configured to detect and send an outdoor environment humidity to the controller.

9. The system of claim 8, wherein, The controller is further configured to trigger the frost detection device to detect the frost condition of the heat exchanger when the outdoor environment temperature is less than a set temperature and the outdoor environment humidity is less than a set humidity.

10. An air conditioner characterized by comprising: The system comprises the system for defrosting according to any one of claims 1 to 9.

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