CN117073140A

CN117073140A - Defrosting method and device for air conditioner, air conditioner and computer readable storage medium

Info

Publication number: CN117073140A
Application number: CN202311038595.5A
Authority: CN
Inventors: 钟浩; 符龙; 金海元; 寇永春; 邓婷; 文欢茂
Original assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Current assignee: Gree Green Refrigeration Technology Center Co Ltd of Zhuhai
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2023-11-17

Abstract

The application provides a defrosting method and device of an air conditioner, the air conditioner and a computer readable storage medium, wherein the air conditioner also comprises an outdoor heat exchanger and a plurality of electronic expansion valves, and the method comprises the following steps: acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period; determining that the operation state of the air conditioner is a defrosting state under the condition that all temperature values of the outdoor heat exchanger in a preset time period are smaller than or equal to a first preset temperature value; and under the condition that the running state of the air conditioner is a defrosting state, at least adjusting the opening degrees of the plurality of electronic expansion valves so as to defrost the air conditioner. Through adjusting the aperture of a plurality of electronic expansion valves, both maintain the operation of heating of air conditioner in the air conditioner defrosting period, can also effectively defrost the air conditioner, and guarantee to reach the refrigerant of compressor and be the low pressure state, guarantee the normal operating of compressor, solved current air conditioner defrosting mode and only relied on the heat of high temperature refrigerant to defrost, inefficiency and user comfort degree relatively poor problem.

Description

Defrosting method and device for air conditioner, air conditioner and computer readable storage medium

Technical Field

The present application relates to the field of air conditioner defrosting, and in particular, to a defrosting method of an air conditioner, a defrosting device of the air conditioner, an air conditioner, and a computer readable storage medium.

Background

After the air conditioner is operated for a period of time during heating, the heat exchanger of the outdoor unit needs to be defrosted. Most of the existing defrosting modes detect the surface temperature of the heat exchanger of the outdoor unit in real time, and as long as the surface temperature of the heat exchanger of the outdoor unit is lower than a preset temperature, the four-way valve is controlled to change the flow direction of the refrigerant, so that the air conditioner enters a refrigerating mode from a heating mode, and the high-temperature refrigerant discharged by the compressor is utilized to defrost the heat exchanger of the outdoor unit. The existing defrosting mode only depends on the heat of the high-temperature refrigerant, and is long in time consumption, so that the indoor temperature is reduced more, and the user is uncomfortable.

Disclosure of Invention

The application aims to provide a defrosting method of an air conditioner, a defrosting device of the air conditioner, the air conditioner and a computer readable storage medium, so as to at least solve the problems that the existing defrosting mode of the air conditioner only depends on the heat of a high-temperature refrigerant to defrost, and the efficiency is poor and the user comfort is poor.

In order to achieve the above object, according to one aspect of the present application, there is provided a defrosting method of an air conditioner further including an outdoor heat exchanger and a plurality of electronic expansion valves, the method comprising: acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period; determining that the operation state of the air conditioner is a defrosting state under the condition that all the temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value; and under the condition that the running state of the air conditioner is the defrosting state, at least adjusting the opening degrees of a plurality of electronic expansion valves so as to defrost the air conditioner.

Optionally, the air conditioner further includes an inner fan, two electronic expansion valves are respectively a first electronic expansion valve and a second electronic expansion valve, and when the running state of the air conditioner is the defrosting state, at least the opening degrees of the electronic expansion valves are adjusted to defrost the air conditioner, including: adjusting the opening degree of the first electronic expansion valve to enable the opening degree of the first electronic expansion valve to be the maximum opening degree; adjusting the opening of the second electronic expansion valve to enable the opening of the second electronic expansion valve to be a first preset opening; and adjusting the wind speed of the inner fan to enable the wind speed of the inner fan to be the lowest wind speed so as to control defrosting of the air conditioner.

Optionally, the air conditioner further includes an inner fan, two electronic expansion valves are respectively a first electronic expansion valve and a second electronic expansion valve, and the method further includes: determining that the operation state of the air conditioner is a heating operation state under the condition that at least one of all temperature values of the outdoor heat exchanger in the preset time period is larger than the first preset temperature value; adjusting the opening degree of the first electronic expansion valve under the condition that the running state of the air conditioner is the heating running state so that the opening degree of the first electronic expansion valve is a second preset opening degree; and when the operation state of the air conditioner is the heating operation state, adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is the maximum opening degree.

Optionally, when the operation state of the air conditioner is the heating operation state, after adjusting the opening of the second electronic expansion valve so that the opening of the second electronic expansion valve is the maximum opening, the method further includes: and under the condition that the running state of the air conditioner is the heating running state and the temperature value of the outdoor heat exchanger is larger than a second preset temperature value, keeping the running parameters of the air conditioner unchanged, wherein the running parameters of the air conditioner at least comprise: the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind speed of an inner fan of the air conditioner, and the second preset temperature value is larger than the first preset temperature value; and under the condition that the running state of the air conditioner is the heating running state and the temperature value of the outdoor heat exchanger is smaller than or equal to the second preset temperature, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve so as to reduce the frosting speed of the outdoor heat exchanger.

Optionally, when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is less than or equal to the second preset temperature, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve to reduce the frosting speed of the outdoor heat exchanger, including: adjusting the opening degree of the first electronic expansion valve so that the opening degree of the first electronic expansion valve is in a first opening degree range, the minimum value of the first opening degree range is larger than a second preset opening degree, and the maximum value of the first opening degree range is smaller than the maximum opening degree of the first electronic expansion valve; and adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is in a second opening degree range to reduce the frosting speed of the outdoor heat exchanger, wherein the minimum value of the second opening degree range is larger than the minimum opening degree of the second electronic expansion valve, and the maximum value of the second opening degree range is smaller than the maximum opening degree of the second electronic expansion valve.

Optionally, after determining that the operation state of the air conditioner is the defrosting state, in the case that all the temperature values of the outdoor heat exchanger in the preset time period are less than or equal to the first preset temperature value, the method further includes: determining the running state of the air conditioner as a target running state when the temperature value of the outdoor heat exchanger is larger than a third preset temperature value, wherein the third preset temperature value is larger than the first preset temperature value, and the target running state is the running state for realizing the function of the air conditioner; and/or determining the running state of the air conditioner as the target running state under the condition that the running time of the running state of the air conditioner is greater than or equal to the preset time.

According to another aspect of the present application, there is provided an air conditioner for defrosting using any one of the defrosting methods of the air conditioner, the air conditioner comprising: an outdoor heat exchanger; the flash evaporator is connected with the outdoor heat exchanger through a pipeline; the indoor unit heat exchanger is connected with the outdoor heat exchanger through the pipeline; the electronic expansion valves are two, namely a first electronic expansion valve and a second electronic expansion valve, the first electronic expansion valve is arranged on a pipeline connecting the indoor unit heat exchanger and the outdoor heat exchanger, and the second electronic expansion valve is arranged on a pipeline connecting the outdoor heat exchanger and the flash evaporator.

Optionally, the air conditioner further includes: the four-way valve is provided with a first end, a second end, a third end and a fourth end, the first end of the four-way valve is connected with the flash evaporator through the pipeline, and the second end of the four-way valve is connected with the indoor unit heat exchanger through the pipeline; the compressor is connected with the third end of the four-way valve through the pipeline; the liquid storage tank is connected with the compressor through the pipeline, and the liquid storage tank is connected with the fourth end of the four-way valve through the pipeline.

According to another aspect of the present application, there is provided a defrosting apparatus of an air conditioner, the air conditioner further including an outdoor heat exchanger and a plurality of electronic expansion valves, the apparatus comprising: an acquisition unit for acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period; a determining unit, configured to determine that an operation state of the air conditioner is a defrosting state when all temperature values of the outdoor heat exchanger in the preset time period are less than or equal to a first preset temperature value; and the adjusting unit is used for adjusting at least the opening degrees of the plurality of electronic expansion valves under the condition that the running state of the air conditioner is the defrosting state so as to defrost the air conditioner.

According to another aspect of the present application, there is provided a computer readable storage medium including a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to perform any one of the defrosting methods of an air conditioner.

By applying the technical scheme of the application, the defrosting method of the air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, and the method comprises the steps of firstly obtaining a plurality of temperature values of the outdoor heat exchanger in a preset time period; then, under the condition that all temperature values of the outdoor heat exchanger in a preset time period are smaller than or equal to a first preset temperature value, determining the running state of the air conditioner as a defrosting state; and finally, under the condition that the running state of the air conditioner is a defrosting state, at least adjusting the opening degrees of the plurality of electronic expansion valves so as to defrost the air conditioner. According to the method, the opening degrees of the plurality of electronic expansion valves are adjusted, the heating operation of the air conditioner is maintained during defrosting of the air conditioner, the air conditioner can be effectively defrosted, the refrigerant reaching the compressor is guaranteed to be in a low-pressure state, the normal operation of the compressor is guaranteed, and the problems that the existing defrosting mode of the air conditioner only depends on the heat of the high-temperature refrigerant to defrost, the efficiency is poor and the user comfort is poor are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

fig. 1 is a block diagram showing a hardware construction of a mobile terminal for performing a defrosting method of an air conditioner according to an embodiment of the present application;

fig. 2 is a schematic flow chart of a defrosting method of an air conditioner according to an embodiment of the application;

fig. 3 is a flow chart illustrating another defrosting method of an air conditioner according to an embodiment of the present application;

fig. 4 is a schematic view showing a structure of an air conditioner according to an embodiment of the present application;

fig. 5 is a block diagram showing a structure of a defrosting apparatus of an air conditioner according to an embodiment of the present application.

Wherein the above figures include the following reference numerals:

01. an outdoor heat exchanger; 02. a flash evaporator; 03. an indoor unit heat exchanger; 04. a first electronic expansion valve; 05. a second electronic expansion valve; 06. a four-way valve; 07. a compressor; 08. a liquid storage tank; 102. a processor; 104. a memory; 106. a transmission device; 108. and an input/output device.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As described in the background art, the defrosting mode of the existing air conditioner only depends on the heat of the high-temperature refrigerant, which consumes longer time, reduces more indoor temperature, causes discomfort to users, and the refrigerant reaching the compressor in other defrosting modes of the existing air conditioner is in a high-pressure state, causes damage to the compressor or can not operate, so as to solve the problems that the defrosting mode of the existing air conditioner only depends on the heat of the high-temperature refrigerant to defrost, and has poor efficiency and poor user comfort.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application.

The method embodiments provided in the embodiments of the present application may be performed in a mobile terminal, a computer terminal or similar computing device. Taking the mobile terminal as an example, fig. 1 is a block diagram of a hardware structure of the mobile terminal of a defrosting method of an air conditioner according to an embodiment of the present application. As shown in fig. 1, a mobile terminal may include one or more (only one is shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a microprocessor MCU or a processing device such as a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 for communication functions and an input-output device 108. It will be appreciated by those skilled in the art that the structure shown in fig. 1 is merely illustrative and not limiting of the structure of the mobile terminal described above. For example, the mobile terminal may also include more or fewer components than shown in fig. 1, or have a different configuration than shown in fig. 1.

The memory 104 may be used to store a computer program, for example, a software program of application software and a module, such as a computer program corresponding to a defrosting method of an air conditioner in an embodiment of the present invention, and the processor 102 executes the computer program stored in the memory 104, thereby performing various functional applications and data processing, that is, implementing the above-mentioned method. Memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include memory remotely located relative to the processor 102, which may be connected to the mobile terminal via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or transmit data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, simply referred to as NIC) that can connect to other network devices through a base station to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is configured to communicate with the internet wirelessly.

In the present embodiment, there is provided a defrosting method of an air conditioner operating on a mobile terminal, a computer terminal or the like, it should be noted that the steps shown in the flowcharts of the drawings may be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described may be executed in an order different from that shown or described herein.

Fig. 2 is a flowchart of a defrosting method of an air conditioner according to an embodiment of the present application. The air conditioner further includes an outdoor heat exchanger and a plurality of electronic expansion valves, as shown in fig. 2, the method includes the steps of:

step S201, obtaining a plurality of temperature values of the outdoor heat exchanger in a preset time period;

specifically, the preset time period may be set to 5min, 10min, 15min, etc., and specific values may be set according to actual situations.

Step S202, determining that the operation state of the air conditioner is a defrosting state under the condition that all the temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value;

specifically, the first preset temperature value may be set to-5 ℃, -6 ℃, -7 ℃ and the like, and specific values may be set according to actual situations. And under the condition that all temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to the first preset temperature value, the running state of the air conditioner is determined to be a defrosting state, so that the air conditioner can be more accurately ensured to enter a defrosting mode under the condition that the air conditioner really needs defrosting, and damage and resource waste caused by repeated defrosting are avoided under the condition that defrosting is mistakenly performed due to errors in temperature acquired by a sensor.

Step S203, when the operation state of the air conditioner is the defrosting state, adjusting at least the opening degrees of the plurality of electronic expansion valves to defrost the air conditioner.

Specifically, the existing defrosting mode of the air conditioner only depends on the heat of a high-temperature refrigerant, the consumed time is long, the indoor temperature is reduced more, the user is uncomfortable, the refrigerant reaching the compressor in other existing defrosting schemes of the air conditioner is in a high-pressure state, the compressor is damaged or cannot operate, defrosting of the air conditioner can be achieved through the addition of a plurality of electronic expansion valves, and the problem of defrosting of the air conditioner is solved on the basis of saving cost.

The air conditioner further includes an inner fan, two electronic expansion valves are provided, and the two electronic expansion valves are a first electronic expansion valve and a second electronic expansion valve respectively, and the implementation steps of the step S203 are as follows:

step S2031, adjusting the opening of the first electronic expansion valve so that the opening of the first electronic expansion valve is the maximum opening;

step S2032, adjusting the opening of the second electronic expansion valve so that the opening of the second electronic expansion valve is a first preset opening;

and step S2033, adjusting the wind speed of the inner fan to enable the wind speed of the inner fan to be the lowest wind speed so as to control defrosting of the air conditioner.

Specifically, when the air conditioner enters a defrosting state, the compressor and the four-way valve of the air conditioner keep running in an original state, the opening degree of the first electronic expansion valve is the maximum opening degree, the refrigerant basically has no throttling effect when flowing through the first electronic expansion valve, the refrigerant can be ensured to flow into the outdoor heat exchanger to defrost completely, the refrigerant flows through the outdoor heat exchanger and is in an exothermic state with the refrigerant flowing through the indoor heat exchanger, and the released heat is used for defrosting of the outdoor heat exchanger. The second electronic expansion valve mainly plays a role in system throttling during defrosting, can reduce the temperature and pressure of the refrigerant, ensures that the refrigerant flowing to the compressor is in a low-pressure state, cannot cause damage to the compressor, and ensures that the compressor operates normally, namely, the first preset opening degree is set to be in a safe and reliable range, the temperature of the refrigerant in the operation process can be ensured, the pressure of the refrigerant flowing through the compressor is the pressure which can be born by the normal operation of the compressor, and the opening degree with the best operation effect of the air conditioner can be ensured to the greatest extent. In addition, the lowest windshield of the inner fan operates, so that not only is the indoor side hot air blown in the defrosting period ensured, but also the temperature of the refrigerant entering the outdoor heat exchanger is greatly improved, and the defrosting effect is better.

In addition, the air conditioner further comprises a flash evaporator, and the flash evaporator is arranged to effectively prevent liquid-free refrigerant from entering the compressor and avoid liquid compression of the compressor.

Wherein, after the step S203 is performed, the method further includes: determining the operation state of the air conditioner as a target operation state when the temperature value of the outdoor heat exchanger is greater than a third preset temperature value, wherein the third preset temperature value is greater than the first preset temperature value, and the target operation state is an operation state for realizing the functions of the air conditioner; and/or, determining the operation state of the air conditioner as the target operation state when the operation state of the air conditioner is that the operation time of the defrosting state is greater than or equal to the preset time.

Specifically, the third preset temperature value may be set to 15 ℃, and in general, the target operation state is a heating operation, because when the ambient temperature is low, the air conditioner is started to perform the heating operation, and at this time, the temperature of the outdoor environment is low, so that the outdoor heat exchanger is easy to frost. When the ambient temperature is higher, the air conditioner is started to perform refrigeration operation, and the outdoor environment is higher at the moment, so that the outdoor heat exchanger is not frosted under the general condition. The preset time can be set to be 10 minutes according to actual conditions, and the like, and the embodiment can ensure that the user demand can be met and the user comfort level is improved while the defrosting effect is higher.

In addition, the air conditioner further comprises an inner fan, two electronic expansion valves, namely a first electronic expansion valve and a second electronic expansion valve, are arranged, and the method further comprises the following steps:

step S301, determining that the operation state of the air conditioner is a heating operation state when at least one of all the temperature values of the outdoor heat exchanger in the preset time period is greater than the first preset temperature value;

step S302, when the running state of the air conditioner is the heating running state, adjusting the opening degree of the first electronic expansion valve so that the opening degree of the first electronic expansion valve is a second preset opening degree;

step S303, when the operation state of the air conditioner is the heating operation state, adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is the maximum opening degree.

Specifically, when the operation state of the air conditioner is the heating operation state, the first electronic expansion valve operates according to the heating operation state, the opening of the second electronic expansion valve is the maximum opening, and the indoor fan maintains the original windshield operation. This state is a normal heating operation state. The second preset opening is the opening of the air conditioner which is set by a user and normally works or the default opening of the air conditioner in the current running state. Thus, the normal operation of the air conditioner can be ensured.

Wherein, after the step S303 is performed, the method further includes the following steps:

step S401, when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is greater than a second preset temperature value, keeping the operation parameters of the air conditioner unchanged, where the operation parameters of the air conditioner at least include: the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind speed of an inner fan of the air conditioner, wherein the second preset temperature value is larger than the first preset temperature value;

step S402, when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is less than or equal to the second preset temperature, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve to reduce the frosting speed of the outdoor heat exchanger.

Specifically, the second preset temperature value is a temperature threshold value of the outdoor heat exchanger, where frosting occurs, and may be set according to actual conditions. And when the running state of the air conditioner is the heating running state and the temperature value of the outdoor heat exchanger is smaller than or equal to the second preset temperature, the outdoor heat exchanger is proved to start to have the frosting condition, and at the moment, the opening degree of the two electronic expansion valves is regulated to control the temperature and the pressure of the refrigerant, so that the frosting condition of the outdoor heat exchanger is slowed down and the normal running of the compressor is ensured.

The specific implementation steps of the step S402 are as follows:

step S4021, adjusting the opening of the first electronic expansion valve so that the opening of the first electronic expansion valve is within a first opening range, wherein a minimum value of the first opening range is greater than a second preset opening, and a maximum value of the first opening range is less than a maximum opening of the first electronic expansion valve;

step S4022, adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is within a second opening degree range, so as to reduce the frosting speed of the outdoor heat exchanger, wherein the minimum value of the second opening degree range is greater than the minimum opening degree of the second electronic expansion valve, and the maximum value of the second opening degree range is less than the maximum opening degree of the second electronic expansion valve.

Specifically, the opening degree of the first electronic expansion valve is increased to increase the temperature and pressure of the refrigerant flowing through the outdoor heat exchanger, so that frosting of the outdoor heat exchanger can be prevented or slowed down, and the opening degree of the second electronic expansion valve is reduced to ensure that the pressure of the refrigerant flowing through the air conditioner compressor is in a low-pressure state, so that normal operation and less damage of the air conditioner compressor are ensured. The heating capacity of the air conditioner is guaranteed to the greatest extent, and the heating operation comfort of the air conditioner is improved.

Wherein the opening degree of the second electronic expansion valve decrease is correlated with the opening degree of the first electronic expansion valve increase.

The defrosting method of the air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, wherein the method comprises the steps of firstly obtaining a plurality of temperature values of the outdoor heat exchanger in a preset time period; then, under the condition that all temperature values of the outdoor heat exchanger in a preset time period are smaller than or equal to a first preset temperature value, determining the running state of the air conditioner as a defrosting state; and finally, under the condition that the running state of the air conditioner is a defrosting state, at least adjusting the opening degrees of the plurality of electronic expansion valves so as to defrost the air conditioner. According to the method, the opening degrees of the plurality of electronic expansion valves are regulated, so that the heating operation of the air conditioner is maintained during defrosting of the air conditioner, the air conditioner can be effectively defrosted, the refrigerant reaching the compressor is guaranteed to be in a low-pressure state, the normal operation of the compressor is guaranteed, and the problems that the existing defrosting mode of the air conditioner only depends on the heat of a high-temperature refrigerant to defrost, the efficiency is poor and the user comfort is poor are solved.

In order to enable those skilled in the art to more clearly understand the technical solution of the present application, the implementation process of the defrosting method of the air conditioner of the present application will be described in detail with reference to specific embodiments.

The embodiment relates to a defrosting method of a specific air conditioner, as shown in fig. 3, comprising the following steps:

step S1: firstly, judging whether the air conditioner meets the condition of entering a defrosting mode, namely judging whether all temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value;

step S2: determining a defrosting mode of the air conditioner under the condition that all temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value, fully opening a first electronic expansion valve, operating a second electronic expansion valve according to a preset opening, and converting an air blower in the air conditioner into low-wind-resistance operation;

step S3: detecting operation parameters of the air conditioner in real time, judging whether the air conditioner meets the condition of exiting the defrosting mode, and controlling the air conditioner to exit the defrosting mode under the condition that the air conditioner meets the condition of exiting the defrosting mode;

step S4: : under the condition that at least one of all temperature values of the outdoor heat exchanger in the preset time period is larger than a first preset temperature value, determining that the air conditioner is in a normal operation mode, wherein the first electronic expansion valve operates according to a preset opening degree, the second electronic expansion valve is fully opened, and the inner fan maintains the original windshield to operate;

Step S5: detecting the temperature of the outdoor heat exchanger in real time, maintaining the current operation parameters of the air conditioner unchanged under the condition that the temperature of the outdoor heat exchanger is larger than the preset temperature, increasing the opening of the first electronic expansion valve and reducing the opening of the second electronic expansion valve under the condition that the temperature of the outdoor heat exchanger is less than the preset temperature so as to prevent or slow down frosting of the outdoor heat exchanger.

It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.

The embodiment of the application also provides an air conditioner, as shown in fig. 4, comprising: an outdoor heat exchanger 01; a flash evaporator 02, wherein the flash evaporator 02 and the outdoor heat exchanger 01 are connected by a pipeline; an indoor heat exchanger 03, wherein the indoor heat exchanger 03 and the outdoor heat exchanger 01 are connected through the pipeline; and a plurality of electronic expansion valves, two of the electronic expansion valves are respectively a first electronic expansion valve 04 and a second electronic expansion valve 05, the first electronic expansion valve 04 is installed on a pipeline connecting the indoor heat exchanger 03 and the outdoor heat exchanger 01, and the second electronic expansion valve 05 is installed on a pipeline connecting the outdoor heat exchanger 01 and the flash evaporator 02.

Illustratively, the above air conditioner further includes: a four-way valve 06 having a first end, a second end, a third end, and a fourth end, wherein the first end of the four-way valve 06 is connected to the flash evaporator 02 through the pipeline, and the second end of the four-way valve 06 is connected to the indoor heat exchanger 03 through the pipeline; a compressor 07, wherein the compressor 07 is connected with a third end of the four-way valve 06 through the pipeline; a liquid storage tank 08, wherein the liquid storage tank 08 is connected to the compressor 07 through the pipe, and the liquid storage tank 08 is connected to the fourth end of the four-way valve 06 through the pipe.

The flash evaporator is arranged to effectively prevent liquid refrigerant from entering the compressor, and the liquid compression of the compressor is avoided.

The air conditioner of the application, the air conditioner adopts any one of the defrosting methods of the air conditioner to defrost, the air conditioner comprises: an outdoor heat exchanger; the flash evaporator is connected with the outdoor heat exchanger through a pipeline; the indoor unit heat exchanger is connected with the outdoor heat exchanger through the pipeline; and a plurality of electronic expansion valves, wherein the electronic expansion valves are two, namely a first electronic expansion valve and a second electronic expansion valve, the first electronic expansion valve is arranged on a pipeline connecting the indoor unit heat exchanger and the outdoor heat exchanger, and the second electronic expansion valve is arranged on a pipeline connecting the outdoor heat exchanger and the flash evaporator. This air conditioner is through adjusting the aperture of a plurality of electronic expansion valves, has both kept the operation of heating of air conditioner in the air conditioner defrosting period, can also effectively defrost the air conditioner, and guarantees that the refrigerant that reaches the compressor is low pressure state, guarantees the normal operating of compressor, has solved current air conditioner defrosting mode and has only relied on the heat of high temperature refrigerant to defrost, and inefficiency and user comfort degree are relatively poor problem.

The embodiment of the application also provides a defrosting device of the air conditioner, and the defrosting device of the air conditioner can be used for executing the defrosting method for the air conditioner. The device is used for realizing the above embodiments and preferred embodiments, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

The defrosting device of the air conditioner provided by the embodiment of the application is described below.

Fig. 5 is a schematic view of a defrosting apparatus of an air conditioner according to an embodiment of the present application. The air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, as shown in fig. 5, the device comprises an acquisition unit 10, a determination unit 20 and an adjustment unit 30, wherein the acquisition unit 10 is used for acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period; the determining unit 20 is configured to determine that the operation state of the air conditioner is a defrosting state when all the temperature values of the outdoor heat exchanger in the preset time period are less than or equal to a first preset temperature value; the adjusting unit 30 is configured to adjust at least the opening degrees of the plurality of electronic expansion valves to defrost the air conditioner when the operation state of the air conditioner is the defrosting state.

The defrosting device of the air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, wherein the device comprises an acquisition unit, a determination unit and an adjustment unit, and the acquisition unit is used for acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period; the determining unit is used for determining that the running state of the air conditioner is a defrosting state under the condition that all the temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value; the adjusting unit is used for adjusting at least the opening degrees of the plurality of electronic expansion valves to defrost the air conditioner when the running state of the air conditioner is the defrosting state. The device not only maintains the heating operation of the air conditioner in the defrosting period of the air conditioner by adjusting the opening degrees of a plurality of electronic expansion valves, but also can effectively defrost the air conditioner, ensures that the refrigerant reaching the compressor is in a low-pressure state, ensures the normal operation of the compressor, and solves the problems that the existing defrosting mode of the air conditioner only depends on the heat of the high-temperature refrigerant to defrost, and has poor efficiency and poor user comfort.

In an optional example, the air conditioner further includes an inner fan, the electronic expansion valves include two electronic expansion valves, and the electronic expansion valves are a first electronic expansion valve and a second electronic expansion valve, and the adjusting unit includes a first adjusting module, a second adjusting module, and a third adjusting module, where the first adjusting module is configured to adjust an opening of the first electronic expansion valve so that the opening of the first electronic expansion valve is a maximum opening; the second adjusting module is used for adjusting the opening of the second electronic expansion valve so that the opening of the second electronic expansion valve is a first preset opening; the third adjusting module is used for adjusting the wind speed of the inner fan so that the wind speed of the inner fan is the lowest wind speed to control defrosting of the air conditioner. The indoor side hot air blowing device can ensure that the refrigerant flows into the outdoor heat exchanger to defrost, reduce the temperature and the pressure of the refrigerant, ensure that the refrigerant flowing into the compressor is in a low-pressure state, avoid damaging the compressor, ensure the normal operation of the compressor, ensure that the indoor side hot air blowing during defrosting is ensured, and greatly improve the temperature of the refrigerant entering the outdoor heat exchanger, so that the defrosting effect is better.

The air conditioner further includes an inner fan, two electronic expansion valves, namely a first electronic expansion valve and a second electronic expansion valve, and a first determining module, a fourth adjusting module and a fifth adjusting module, where the first determining module is configured to determine that the operation state of the air conditioner is a heating operation state when at least one of all temperature values of the outdoor heat exchanger in the preset time period is greater than the first preset temperature value; the fourth adjusting module is used for adjusting the opening of the first electronic expansion valve to enable the opening of the first electronic expansion valve to be a second preset opening when the running state of the air conditioner is the heating running state; and the fifth adjusting module is used for adjusting the opening degree of the second electronic expansion valve to make the opening degree of the second electronic expansion valve be the maximum opening degree when the running state of the air conditioner is the heating running state. The normal operation of the air conditioner can be ensured.

As an alternative, the apparatus further includes a processing module and a sixth adjusting module, where the processing module is configured to adjust, when the operation state of the air conditioner is the heating operation state, the opening of the second electronic expansion valve so that, after the opening of the second electronic expansion valve is the maximum opening, when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is greater than a second preset temperature value, keep the operation parameter of the air conditioner unchanged, where the operation parameter of the air conditioner at least includes: the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind speed of an inner fan of the air conditioner, wherein the second preset temperature value is larger than the first preset temperature value; the sixth adjusting module is configured to adjust an opening degree of the first electronic expansion valve and an opening degree of the second electronic expansion valve to reduce a frosting speed of the outdoor heat exchanger when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is less than or equal to the second preset temperature. The opening degree of the two electronic expansion valves is regulated to control the temperature and the pressure of the refrigerant, so that the normal operation of the compressor is ensured while the frosting condition of the outdoor heat exchanger is slowed down.

The sixth adjusting module comprises a first adjusting sub-module and a second adjusting sub-module, wherein the first adjusting sub-module is used for adjusting the opening of the first electronic expansion valve so that the opening of the first electronic expansion valve is in a first opening range, the minimum value of the first opening range is larger than a second preset opening, and the maximum value of the first opening range is smaller than the maximum opening of the first electronic expansion valve; the second adjusting submodule is used for adjusting the opening of the second electronic expansion valve so that the opening of the second electronic expansion valve is in a second opening range, the minimum value of the second opening range is larger than the minimum opening of the second electronic expansion valve, and the maximum value of the second opening range is smaller than the maximum opening of the second electronic expansion valve. The opening degree of the first electronic expansion valve is increased, so that the temperature and the pressure of the refrigerant flowing through the outdoor heat exchanger can be increased, frosting of the outdoor heat exchanger can be prevented or slowed down, and the opening degree of the second electronic expansion valve is reduced to ensure that the pressure of the refrigerant flowing through the air conditioner compressor is in a low-pressure state, and the air conditioner compressor is ensured to normally operate and have less damage. The heating capacity of the air conditioner is guaranteed to the greatest extent, and the heating operation comfort of the air conditioner is improved.

In this embodiment, the apparatus further includes a second determining module and a third determining module, where the second determining module is configured to determine, when all the temperature values of the outdoor heat exchanger in the preset time period are less than or equal to a first preset temperature value, after determining that the operation state of the air conditioner is a defrosting state, determine, when the temperature value of the outdoor heat exchanger is greater than a third preset temperature value, the operation state of the air conditioner as a target operation state, and the third preset temperature value is greater than the first preset temperature value, where the target operation state is an operation state for implementing a function of the air conditioner; the third determining module is configured to determine the operation state of the air conditioner as the target operation state when the operation time of the air conditioner in which the operation state of the air conditioner is the defrosting state is greater than or equal to a preset time. Can guarantee when defrosting effect is higher, can also satisfy user's demand, improve user comfort level.

The defrosting device of the air conditioner comprises a processor and a memory, wherein the acquisition unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions. The modules are all located in the same processor; alternatively, the above modules may be located in different processors in any combination.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more, and the problems that the existing air conditioner defrosting mode only depends on the heat of a high-temperature refrigerant to defrost, the efficiency is poor and the user comfort is poor are solved by adjusting the parameters of the inner core.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is located to execute the defrosting method of the air conditioner.

Specifically, the defrosting method of the air conditioner comprises the following steps:

Optionally, the air conditioner further includes an inner fan, the two electronic expansion valves are a first electronic expansion valve and a second electronic expansion valve, and when the operation state of the air conditioner is the defrosting state, at least the opening degrees of the plurality of electronic expansion valves are adjusted to defrost the air conditioner, including: adjusting the opening of the first electronic expansion valve to make the opening of the first electronic expansion valve be the maximum opening; adjusting the opening of the second electronic expansion valve to enable the opening of the second electronic expansion valve to be a first preset opening; and adjusting the wind speed of the inner fan to enable the wind speed of the inner fan to be the lowest wind speed so as to control defrosting of the air conditioner.

Optionally, the air conditioner further includes an inner fan, two electronic expansion valves, namely a first electronic expansion valve and a second electronic expansion valve, and the method further includes: determining that the operation state of the air conditioner is a heating operation state when at least one of all the temperature values of the outdoor heat exchanger in the preset time period is greater than the first preset temperature value; when the operation state of the air conditioner is the heating operation state, adjusting the opening degree of the first electronic expansion valve so that the opening degree of the first electronic expansion valve is a second preset opening degree; and adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is the maximum opening degree when the operation state of the air conditioner is the heating operation state.

Optionally, when the operation state of the air conditioner is the heating operation state, after adjusting the opening of the second electronic expansion valve so that the opening of the second electronic expansion valve is the maximum opening, the method further includes: and when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is larger than a second preset temperature value, keeping the operation parameters of the air conditioner unchanged, wherein the operation parameters of the air conditioner at least comprise: the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind speed of an inner fan of the air conditioner, wherein the second preset temperature value is larger than the first preset temperature value; and when the running state of the air conditioner is the heating running state and the temperature value of the outdoor heat exchanger is smaller than or equal to the second preset temperature, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve so as to reduce the frosting speed of the outdoor heat exchanger.

Optionally, when the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is less than or equal to the second preset temperature, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve to reduce the frosting speed of the outdoor heat exchanger, including: adjusting the opening degree of the first electronic expansion valve so that the opening degree of the first electronic expansion valve is within a first opening degree range, wherein the minimum value of the first opening degree range is larger than a second preset opening degree, and the maximum value of the first opening degree range is smaller than the maximum opening degree of the first electronic expansion valve; and adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is within a second opening degree range, and reducing the frosting speed of the outdoor heat exchanger, wherein the minimum value of the second opening degree range is larger than the minimum opening degree of the second electronic expansion valve, and the maximum value of the second opening degree range is smaller than the maximum opening degree of the second electronic expansion valve.

Optionally, after determining that the operation state of the air conditioner is the defrosting state, in the case that all the temperature values of the outdoor heat exchanger in the preset time period are less than or equal to the first preset temperature value, the method further includes: determining the operation state of the air conditioner as a target operation state when the temperature value of the outdoor heat exchanger is greater than a third preset temperature value, wherein the third preset temperature value is greater than the first preset temperature value, and the target operation state is an operation state for realizing the functions of the air conditioner; and/or, determining the operation state of the air conditioner as the target operation state when the operation state of the air conditioner is that the operation time of the defrosting state is greater than or equal to the preset time.

The embodiment of the invention provides a processor which is used for running a program, wherein the program runs to execute the defrosting method of the air conditioner.

The embodiment of the invention provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:

The device herein may be a server, PC, PAD, cell phone, etc.

The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may be implemented in program code executable by computing devices, so that they may be stored in a storage device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.

From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:

1) The defrosting method of the air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, wherein the method comprises the steps of firstly obtaining a plurality of temperature values of the outdoor heat exchanger in a preset time period; then, under the condition that all temperature values of the outdoor heat exchanger in a preset time period are smaller than or equal to a first preset temperature value, determining the running state of the air conditioner as a defrosting state; and finally, under the condition that the running state of the air conditioner is a defrosting state, at least adjusting the opening degrees of the plurality of electronic expansion valves so as to defrost the air conditioner. According to the method, the opening degrees of the plurality of electronic expansion valves are regulated, so that the heating operation of the air conditioner is maintained during defrosting of the air conditioner, the air conditioner can be effectively defrosted, the refrigerant reaching the compressor is guaranteed to be in a low-pressure state, the normal operation of the compressor is guaranteed, and the problems that the existing defrosting mode of the air conditioner only depends on the heat of a high-temperature refrigerant to defrost, the efficiency is poor and the user comfort is poor are solved.

2) The air conditioner of the present application is an air conditioner for defrosting by adopting any one of the defrosting methods of the air conditioner, the air conditioner comprising: an outdoor heat exchanger; the flash evaporator is connected with the outdoor heat exchanger through a pipeline; the indoor unit heat exchanger is connected with the outdoor heat exchanger through the pipeline; and a plurality of electronic expansion valves, wherein the electronic expansion valves are two, namely a first electronic expansion valve and a second electronic expansion valve, the first electronic expansion valve is arranged on a pipeline connecting the indoor unit heat exchanger and the outdoor heat exchanger, and the second electronic expansion valve is arranged on a pipeline connecting the outdoor heat exchanger and the flash evaporator. This air conditioner is through adjusting the aperture of a plurality of electronic expansion valves, has both kept the operation of heating of air conditioner in the air conditioner defrosting period, can also effectively defrost the air conditioner, and guarantees that the refrigerant that reaches the compressor is low pressure state, guarantees the normal operating of compressor, has solved current air conditioner defrosting mode and has only relied on the heat of high temperature refrigerant to defrost, and inefficiency and user comfort degree are relatively poor problem.

3) The defrosting device of the air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, wherein the device comprises an acquisition unit, a determination unit and an adjustment unit, and the acquisition unit is used for acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period; the determining unit is used for determining that the running state of the air conditioner is a defrosting state under the condition that all the temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value; the adjusting unit is used for adjusting at least the opening degrees of the plurality of electronic expansion valves to defrost the air conditioner when the running state of the air conditioner is the defrosting state. The device not only maintains the heating operation of the air conditioner in the defrosting period of the air conditioner by adjusting the opening degrees of a plurality of electronic expansion valves, but also can effectively defrost the air conditioner, ensures that the refrigerant reaching the compressor is in a low-pressure state, ensures the normal operation of the compressor, and solves the problems that the existing defrosting mode of the air conditioner only depends on the heat of the high-temperature refrigerant to defrost, and has poor efficiency and poor user comfort.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A defrosting method of an air conditioner, the air conditioner further comprising an outdoor heat exchanger and a plurality of electronic expansion valves, the method comprising:

acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period;

determining that the operation state of the air conditioner is a defrosting state under the condition that all the temperature values of the outdoor heat exchanger in the preset time period are smaller than or equal to a first preset temperature value;

and under the condition that the running state of the air conditioner is the defrosting state, at least adjusting the opening degrees of a plurality of electronic expansion valves so as to defrost the air conditioner.

2. The defrosting method of claim 1, wherein the air conditioner further comprises an internal fan, the number of the electronic expansion valves is two, and the electronic expansion valves are respectively a first electronic expansion valve and a second electronic expansion valve, and when the operation state of the air conditioner is the defrosting state, at least adjusting the opening degrees of the electronic expansion valves to defrost the air conditioner comprises:

adjusting the opening degree of the first electronic expansion valve to enable the opening degree of the first electronic expansion valve to be the maximum opening degree;

adjusting the opening of the second electronic expansion valve to enable the opening of the second electronic expansion valve to be a first preset opening;

And adjusting the wind speed of the inner fan to enable the wind speed of the inner fan to be the lowest wind speed so as to control defrosting of the air conditioner.

3. The defrosting method of claim 1 wherein the air conditioner further comprises an internal blower, the electronic expansion valves being two, a first electronic expansion valve and a second electronic expansion valve, respectively, the method further comprising:

determining that the operation state of the air conditioner is a heating operation state under the condition that at least one of all temperature values of the outdoor heat exchanger in the preset time period is larger than the first preset temperature value;

adjusting the opening degree of the first electronic expansion valve under the condition that the running state of the air conditioner is the heating running state so that the opening degree of the first electronic expansion valve is a second preset opening degree;

and when the operation state of the air conditioner is the heating operation state, adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is the maximum opening degree.

4. A defrosting method according to claim 3, wherein, in the case where the operation state of the air conditioner is the heating operation state, the opening degree of the second electronic expansion valve is adjusted so that the opening degree of the second electronic expansion valve is the maximum opening degree, the method further comprises:

And under the condition that the running state of the air conditioner is the heating running state and the temperature value of the outdoor heat exchanger is larger than a second preset temperature value, keeping the running parameters of the air conditioner unchanged, wherein the running parameters of the air conditioner at least comprise: the opening degree of the first electronic expansion valve, the opening degree of the second electronic expansion valve and the wind speed of an inner fan of the air conditioner, and the second preset temperature value is larger than the first preset temperature value;

and under the condition that the running state of the air conditioner is the heating running state and the temperature value of the outdoor heat exchanger is smaller than or equal to the second preset temperature, adjusting the opening of the first electronic expansion valve and the opening of the second electronic expansion valve so as to reduce the frosting speed of the outdoor heat exchanger.

5. The defrosting method according to claim 4, wherein, in the case where the operation state of the air conditioner is the heating operation state and the temperature value of the outdoor heat exchanger is less than or equal to the second preset temperature, adjusting the opening degree of the first electronic expansion valve and the opening degree of the second electronic expansion valve to reduce the frosting speed of the outdoor heat exchanger includes:

Adjusting the opening degree of the first electronic expansion valve so that the opening degree of the first electronic expansion valve is in a first opening degree range, the minimum value of the first opening degree range is larger than a second preset opening degree, and the maximum value of the first opening degree range is smaller than the maximum opening degree of the first electronic expansion valve;

and adjusting the opening degree of the second electronic expansion valve so that the opening degree of the second electronic expansion valve is in a second opening degree range to reduce the frosting speed of the outdoor heat exchanger, wherein the minimum value of the second opening degree range is larger than the minimum opening degree of the second electronic expansion valve, and the maximum value of the second opening degree range is smaller than the maximum opening degree of the second electronic expansion valve.

6. The defrosting method according to claim 1, wherein, in the case where all the temperature values of the outdoor heat exchanger in the preset time period are less than or equal to a first preset temperature value, after determining that the operation state of the air conditioner is the frosted state, the method further comprises:

determining the running state of the air conditioner as a target running state when the temperature value of the outdoor heat exchanger is larger than a third preset temperature value, wherein the third preset temperature value is larger than the first preset temperature value, and the target running state is the running state for realizing the function of the air conditioner;

And/or the number of the groups of groups,

and determining the running state of the air conditioner as the target running state under the condition that the running time of the air conditioner in the running state of the defrosting state is greater than or equal to the preset time.

7. An air conditioner characterized in that it is an air conditioner that performs defrosting by using the defrosting method of an air conditioner according to any one of claims 1 to 6, comprising:

an outdoor heat exchanger;

the flash evaporator is connected with the outdoor heat exchanger through a pipeline;

the indoor unit heat exchanger is connected with the outdoor heat exchanger through the pipeline;

the electronic expansion valves are two, namely a first electronic expansion valve and a second electronic expansion valve, the first electronic expansion valve is arranged on a pipeline connecting the indoor unit heat exchanger and the outdoor heat exchanger, and the second electronic expansion valve is arranged on a pipeline connecting the outdoor heat exchanger and the flash evaporator.

8. The air conditioner of claim 7, further comprising:

the four-way valve is provided with a first end, a second end, a third end and a fourth end, the first end of the four-way valve is connected with the flash evaporator through the pipeline, and the second end of the four-way valve is connected with the indoor unit heat exchanger through the pipeline;

The compressor is connected with the third end of the four-way valve through the pipeline;

the liquid storage tank is connected with the compressor through the pipeline, and the liquid storage tank is connected with the fourth end of the four-way valve through the pipeline.

9. A defrosting apparatus of an air conditioner, wherein the air conditioner further comprises an outdoor heat exchanger and a plurality of electronic expansion valves, the apparatus comprising:

an acquisition unit for acquiring a plurality of temperature values of the outdoor heat exchanger in a preset time period;

a determining unit, configured to determine that an operation state of the air conditioner is a defrosting state when all temperature values of the outdoor heat exchanger in the preset time period are less than or equal to a first preset temperature value;

and the adjusting unit is used for adjusting at least the opening degrees of the plurality of electronic expansion valves under the condition that the running state of the air conditioner is the defrosting state so as to defrost the air conditioner.

10. A computer-readable storage medium, characterized in that the computer-readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer-readable storage medium is located to perform the defrosting method of an air conditioner according to any one of claims 1 to 6.