WO2021082076A1

WO2021082076A1 - Air conditioner

Info

Publication number: WO2021082076A1
Application number: PCT/CN2019/117906
Authority: WO
Inventors: 彭炳全; 吕根贵
Original assignee: 海信家电集团股份有限公司; 海信（广东）空调有限公司
Priority date: 2019-11-01
Filing date: 2019-11-13
Publication date: 2021-05-06
Also published as: JP2022508978A; JP7138162B2

Abstract

Provided is an air conditioner. An indoor heat exchanger (21) of the air conditioner is configured by an outdoor control portion (14) to work as an evaporator, such that an ice layer is formed on the surface of the indoor heat exchanger (21), and after the ice layer is formed on the surface of the indoor heat exchanger (21), the indoor heat exchanger (21) is configured to work as a condenser, such that the ice layer formed on the surface of the indoor heat exchanger (21) melts. An expansion valve (13) is controlled by the outdoor control portion (14) so that the degree by which same is open when a compressor (11) is configured to stop working, and the degree by which same is open when the indoor heat exchanger (21) is configured to work as the evaporator remain unchanged.

Description

An air conditioner

This disclosure requires the priority of a Chinese patent application filed with the Chinese Patent Office, the application number is 201911061927.5, and the application name is "a kind of air conditioner" on November 1, 2019; the application is filed with the Chinese Patent Office on November 1, 2019 The priority of the Chinese patent application with the number 201921870642.1 and the application name "A kind of air conditioner"; the Chinese patent filed with the Chinese Patent Office with the application number 201911061213.4 and the application name "A kind of air conditioner" on November 1, 2019 The priority of the application; and the priority of the Chinese patent application filed with the Chinese Patent Office on November 1, 2019, the application number is 201921870650.6, and the application name is "a kind of air conditioner", the entire content of which is incorporated into this disclosure by reference .

Technical field

This application relates to the technical field of air conditioners, and in particular to an air conditioner.

Background technique

After the air conditioner is placed or used for a long time, there will be a certain amount of dirt on the surface of the heat exchanger, which will reduce the heat exchange efficiency of the heat exchanger, thereby causing the performance of the air conditioner to decrease and the energy consumption to increase. The main cleaning method of the existing air conditioner is to freeze the surface of the indoor unit coil in the cooling mode to form an ice layer, and switch from the cooling mode to the heating mode to melt the ice layer and form condensed water. The condensed water is in the fan. The airflow provided will take away the dust on the surface of the heat exchanger and achieve the cleaning effect on the air conditioner. However, when the existing air conditioner is in the cleaning mode, the ice layer on the surface melts too fast to cause the condensation formed by melting The low water volume reduces the cleaning performance of the dust on the surface of the indoor heat exchanger.

Summary of the invention

The embodiments of the present application provide an air conditioner and an air conditioner cleaning method, which are used to solve the problem of poor air conditioner cleaning effect in the prior art and effectively clean the air conditioner.

In order to achieve the foregoing objectives, the embodiments of the present application adopt the following technical solutions:

The embodiment of the present application provides an air conditioner, including: a compressor for compressing a low-pressure refrigerant to form a high-pressure refrigerant; an indoor heat exchanger for performing indoor airflow with the refrigerant transmitted in the indoor heat exchanger Heat exchange; an outdoor heat exchanger for heat exchange between the outdoor airflow and the refrigerant transmitted in the outdoor heat exchanger; an expansion valve, connected between the indoor heat exchanger and the outdoor heat exchanger, The pressure of the refrigerant flowing through the indoor heat exchanger and the outdoor heat exchanger is adjusted by the opening degree of the expansion valve; the outdoor control part is configured to at least control the opening degree and the pressure of the expansion valve The operating frequency of the compressor; a refrigerant circuit consisting of the compressor, the outdoor heat exchanger, the expansion valve, and the indoor heat exchanger connected in sequence, and the refrigerant circulates in the refrigerant circuit; The indoor heat exchanger is configured by the outdoor control unit to operate as an evaporator to form an ice layer on the surface of the indoor heat exchanger. After the ice layer is formed on the surface of the indoor heat exchanger, the compressor is The outdoor control part is configured to stop working according to a preset stop time to melt the ice layer formed on the surface of the indoor heat exchanger; the expansion valve is controlled by the outdoor control part to stop working when the compressor is configured to stop working The opening degree at time and the opening degree of the expansion valve when the indoor heat exchanger is configured as the evaporator remain unchanged.

The compressor is configured to start operation by the outdoor control unit after the preset shutdown time, and the indoor heat exchanger is configured to operate as a condenser by the outdoor control unit to dry the surface of the indoor heat exchanger .

The expansion valve is controlled by the outdoor control unit to have a smaller opening when the indoor heat exchanger is configured as the condenser to operate than when the expansion valve is configured as the evaporator when the indoor heat exchanger is configured as the evaporator Opening when working.

The four-way valve is connected to the refrigerant circuit, and the four-way valve switches the flow direction of the refrigerant in the refrigerant circuit under the control of the outdoor control unit so that the indoor heat exchanger is an evaporator or a condenser jobs.

The expansion valve is controlled by the outdoor control unit so that the opening degree of the compressor remains unchanged during the preset shutdown time when the compressor is configured to shut down.

The expansion valve is controlled by the outdoor control unit to maintain the same opening degree when the indoor heat exchanger is configured to operate the condenser.

In the air conditioner provided by the embodiments of the present application, the indoor heat exchanger is configured by the outdoor control part to work as an evaporator so that an ice layer is formed on the surface of the indoor heat exchanger. After the ice layer is formed on the surface of the indoor heat exchanger, the indoor heat exchange The condenser is configured to work as a condenser to melt the ice layer formed on the surface of the indoor heat exchanger; the expansion valve is controlled by the outdoor control unit to have an opening when the compressor is configured to shut down and the indoor heat exchanger is configured as an evaporator The opening degree during operation remains unchanged to prevent the rapid circulation of the refrigerant in the indoor heat exchanger due to the increase in the opening degree of the expansion valve when the compressor is stopped, and the melting rate of the ice layer on the surface of the indoor heat exchanger is too high to maintain The constant opening of the expansion valve can reduce the melting rate of the ice layer on the surface of the indoor heat exchanger, so that the condensed water formed by the melting of the ice layer slowly forms on the surface of the indoor heat exchanger, which can ensure that the condensed water fully interacts with the indoor heat exchanger. In order to absorb the dust attached to its surface, the condensed water can increase the amount of condensed water to increase the dust washing, thereby improving the cleaning effect of condensed water on the surface dust of the indoor heat exchanger, which solves the problem of air conditioning in the prior art. The problem of poor cleaning effect is to effectively clean the internal heat exchanger of the air conditioner.

Description of the drawings

FIG. 1 is a schematic structural diagram of an air conditioner provided by an embodiment of the application;

Fig. 2 is a schematic diagram of an air conditioner system provided by an embodiment of the application.

Detailed ways

The specific implementation of the present application will be further described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1 and 2, an embodiment of the present application provides an air conditioner. The air conditioner is a split air conditioner composed of an outdoor unit 10 and an indoor unit 20. The outdoor unit 10 and the indoor unit 20 are connected by pipelines for transmission. The refrigerant is connected by a data cable to transmit communication information.

In addition to the outdoor unit 10 and the indoor unit 20, the air conditioner may also include an air purification unit, a ventilation unit, a humidification unit, a dehumidification unit, a heater, and the like. The above-mentioned units may be integrally controlled in a state of being coupled to the outdoor unit 10 and the indoor unit 20.

The outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, an expansion valve 13, an outdoor control unit 14, an outdoor fan 15 and a four-way valve 16.

The compressor 11 is used to compress the refrigerant so that the low-pressure refrigerant is compressed to form a high-pressure refrigerant.

The outdoor heat exchanger 12 is used to exchange heat between the outdoor airflow and the refrigerant transmitted in the outdoor heat exchanger 12. Specifically, the outdoor heat exchanger 12 works as a condenser under the cooling condition of the air conditioner, so that the compressor 11 The compressed refrigerant is condensed in the outdoor heat exchanger 12; the outdoor heat exchanger 12 works as an evaporator under the heating condition of the air conditioner, so that the decompressed refrigerant evaporates in the outdoor heat exchanger 12.

In some embodiments of the present application, the cooling fins (not shown) of the outdoor heat exchanger 12 are used to expand the refrigerant pipes (not shown) of the outdoor heat exchanger 12 through which the outdoor air and refrigerant pass. ) To improve the heat exchange efficiency between the outdoor air and the refrigerant.

The expansion valve 13 is connected between the indoor heat exchanger 21 and the outdoor heat exchanger 12. The opening of the expansion valve 13 adjusts the pressure of the refrigerant flowing through the indoor heat exchanger 21 and the outdoor heat exchanger 12 to adjust the pressure of the refrigerant flowing indoors. The flow rate of the refrigerant between the heat exchanger 21 and the outdoor heat exchanger 12, wherein the flow value and pressure value of the refrigerant circulating in the indoor heat exchanger 21 and the outdoor heat exchanger 12 will affect the indoor heat exchanger 21 and the outdoor heat exchanger. The heat exchange performance of the heat exchanger 12. The expansion valve 13 may be an electronic valve, and the opening degree of the expansion valve 13 is adjustable to control the flow and pressure of the refrigerant flowing through the expansion valve 13.

The outdoor control unit 14 is configured to control the opening degree of the expansion valve 13 and the operating frequency of the compressor 11.

The outdoor fan 15 is used to suck outdoor air into the outdoor unit 10 through the outdoor air inlet, exchange heat through the outdoor heat exchanger 12 and send it out from the outdoor air outlet, and the outdoor fan 15 provides power for the flow of air.

The four-way valve 16 is connected to the refrigerant circuit. The four-way valve 16 is controlled by the outdoor control unit 14 to switch the flow direction of the refrigerant in the refrigerant circuit so that the indoor unit 20 performs cooling or heating conditions.

The refrigerant circuit is composed of a compressor 11, an outdoor heat exchanger 12, an expansion valve 13, and an indoor heat exchanger 21 connected in sequence. The refrigerant circulates in the refrigerant circuit for the indoor heat exchanger 21 and the outdoor heat exchanger 12 The heat is exchanged with the air respectively to realize cooling or heating of the indoor unit 20.

The indoor unit 20 includes an indoor heat exchanger 21, an indoor fan 22, and an indoor control unit 23.

The indoor heat exchanger 21 is used to exchange heat between the indoor airflow and the refrigerant transmitted in the indoor heat exchanger 21.

The indoor fan 22 is used to suck indoor air into the indoor unit 20 through the indoor air inlet, exchange heat through the indoor heat exchanger 21 and send it out from the indoor air outlet, and the indoor fan 22 provides power for the flow of air.

The indoor control unit 23 is configured to control the rotation speed of the indoor fan 22, and the indoor control unit 23 and the outdoor control unit 14 are connected through a data line to transmit communication information.

In order to clean the dust attached to the surface of the indoor heat exchanger 21, the indoor unit 20 is controlled to perform a cooling mode, and the compressor 11 works. Specifically, the outdoor control unit 14 controls the four-way valve 16 so that the refrigerant flows in the refrigerant circuit according to a preset flow direction so that the indoor unit 20 operates in a cooling mode, and when the indoor unit 20 operates in a cooling mode The indoor heat exchanger 21 is configured to work as an evaporator, and water molecules in the air meet cold on the surface of the indoor heat exchanger 21, condense on the surface of the indoor heat exchanger 21 and further form an ice layer.

After an ice layer is formed on the surface of the indoor heat exchanger 21, the outdoor control unit 14 controls the compressor 11 to stop working according to the preset shutdown time, so that the compressor 11 maintains the stopped state for the preset shutdown time, so that the compressor 11 is in the indoor unit. 20. Overpressure protection when operating conditions are switched. For example, the preset shutdown time of the compressor 11 is 3 minutes.

After the compressor 11 maintains a stopped state for a preset shutdown time, the outdoor control unit 14 controls the start of the compressor 11, and the outdoor control unit 14 controls the four-way valve 16 so that the refrigerant flows in the refrigerant circuit according to the preset flow direction. The indoor unit 20 is made to work under heating conditions. When the indoor unit 20 is operated under heating conditions, the indoor heat exchanger 21 is configured to work as a condenser, and thus, the indoor heat exchanger 21 is configured as a condenser. Work to melt the ice layer formed on the surface of the indoor heat exchanger 21. The condensed water formed by the melting of the ice layer can clean the dust contained in the ice layer. At the same time, the condensed water flows on the surface of the indoor heat exchanger 21. The surface of the indoor heat exchanger 21 can be washed to ensure the cleanliness of the surface of the indoor heat exchanger 21.

In order to improve the cleaning effect on the surface of the indoor heat exchanger 21, in the embodiment of the present application, the expansion valve 13 is controlled by the outdoor control unit 14 to open and expand during the preset shutdown time when the compressor 11 is configured to shut down. The opening degree of the valve 13 in the indoor heat exchanger 21 is configured to maintain the same when the evaporator is working, that is, the opening degree of the expansion valve 13 when the compressor stops working is different from that of the indoor unit 20 in the cooling mode. The opening degree of the layer is the same during operation. For example, the opening degree of the expansion valve 13 when the compressor is stopped is 400°, and the opening degree of the expansion valve 13 when the indoor unit 20 is working to form an ice layer under cooling conditions is 400°.

By maintaining the opening degree of the expansion valve 13 unchanged during the preset shutdown time when the compressor 11 is configured to shut down, the refrigerant is prevented from quickly circulating in the indoor heat exchanger 21, and the refrigerant with a lower flow rate is flowing through the indoor heat exchanger 21. At this time, the heat exchange performance of the indoor heat exchanger 21 is reduced, and the melting rate of the ice layer on the surface of the indoor heat exchanger is reduced, so that the condensed water formed by the melting of the ice layer slowly forms on the surface of the indoor heat exchanger 21 and melts slowly. The formed condensate can fully contact the surface of the indoor heat exchanger 21 to absorb and wash away the dust attached to the indoor heat exchanger 21. At the same time, the amount of condensate water can be increased to increase the washing of dust on the surface of the heat exchanger, and further Therefore, the cleaning performance of the surface of the indoor heat exchanger 21 is improved.

The compressor 11 stops working during the preset stop time. The purpose is to protect the compressor 11 from overpressure protection before the indoor unit 20 is switched from the cooling mode to the heating mode. In order to quickly start the subsequent heating mode, the expansion valve The opening degree of 13 cannot be reduced so that the pressure between the indoor unit and the outdoor unit is too high, which affects the restart of the compressor 11 and the stability of the refrigerant circuit.

In order to improve the cleaning effect on the surface of the indoor heat exchanger 21, in the embodiment of the present application, the expansion valve 13 is controlled by the outdoor control unit 14 to have a smaller opening when the indoor heat exchanger 21 is configured to operate as a condenser. 13 When the indoor heat exchanger 21 is configured as the evaporator, the opening degree of the expansion valve 13 is smaller than that of the indoor unit 20 when the indoor unit 20 is working to melt ice under heating conditions. The opening degree when the ice layer is formed in the cooling mode. For example, the opening degree of the expansion valve 13 when the indoor unit 20 is in the heating mode to melt the ice layer is 300°, and the expansion valve 13 is in the indoor unit 20 The opening degree is 400° when the ice layer is formed under the cooling condition.

It should be noted that by reducing the opening of the expansion valve 13 when the indoor unit 20 is in heating mode, the high-pressure refrigerant of the outdoor heat exchanger slowly enters the indoor heat exchanger 21, and the refrigerant with a lower flow rate is flowing. Passing through the indoor heat exchanger 21 can reduce the heat exchange performance of the indoor heat exchanger 21, thereby reducing the melting rate of the ice layer on the surface of the indoor heat exchanger, so that the condensed water formed by the melting of the ice layer is slowly formed in the indoor heat exchanger On the surface of 21, the condensed water formed by the slow melting can fully contact the surface of the indoor heat exchanger 21 to absorb and wash away the dust attached to the indoor heat exchanger 21, and at the same time, it can increase the amount of condensed water to increase the impact on the heat exchanger. The scouring of surface dust improves the cleaning performance of the surface of the indoor heat exchanger 21 in some embodiments of the present application.

In order to ensure the stability of the flow of refrigerant in the refrigerant circuit and the stability of the heat exchange system, the expansion valve 13 is controlled by the outdoor control unit 14 to maintain the same opening during the preset shutdown time of the compressor 11 to prevent The refrigerant circuit fluctuates in the refrigerant flow when the compressor 11 is shut down. In some embodiments of the present application, the expansion valve 13 is controlled by the outdoor control unit 14 to maintain the same opening when the indoor heat exchanger 21 is configured to operate as a condenser, thereby preventing the refrigerant circuit from being controlled by the indoor unit 20. The flow of the refrigerant during operation under hot conditions fluctuates to ensure the stability of the melting of the ice layer on the surface of the indoor heat exchanger 21 and the stability of the condensed water volume.

It should be noted that the above-mentioned units can be separately established processors, or they can be integrated into a certain processor of the controller for implementation. In addition, they can also be stored in the memory of the controller in the form of program codes, and the controller One of the processors calls and executes the functions of the above units. The processor described here may be a central processing unit (CPU), or a specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application Circuit.

It should be understood that in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.

A person of ordinary skill in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which is not repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection between devices or units through some interfaces, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

Claims

An air conditioner, characterized by comprising:

Compressor, used to compress low-pressure refrigerant to form high-pressure refrigerant;

The indoor heat exchanger is used to exchange heat between the indoor airflow and the refrigerant transmitted in the indoor heat exchanger;

The outdoor heat exchanger is used to exchange heat between the outdoor airflow and the refrigerant transmitted in the outdoor heat exchanger;

The expansion valve is connected between the indoor heat exchanger and the outdoor heat exchanger, and the pressure of the refrigerant flowing through the indoor heat exchanger and the outdoor heat exchanger is adjusted by the opening degree of the expansion valve ；

The outdoor control unit is configured to at least control the opening degree of the expansion valve and the operating frequency of the compressor;

The refrigerant circuit is composed of the compressor, the outdoor heat exchanger, the expansion valve and the indoor heat exchanger connected in sequence, and the refrigerant circulates in the refrigerant circuit;

The indoor heat exchanger is configured by the outdoor control unit to operate as an evaporator to form an ice layer on the surface of the indoor heat exchanger. After the ice layer is formed on the surface of the indoor heat exchanger, the compressor is The outdoor control unit is configured to stop working according to the preset shutdown time to melt the ice layer formed on the surface of the indoor heat exchanger;

The expansion valve is controlled by the outdoor control unit to have an opening degree when the compressor is configured to stop operating and an opening degree of the expansion valve when the indoor heat exchanger is configured to operate as the evaporator stay the same.
The air conditioner according to claim 1, wherein the compressor is configured to start operation by the outdoor control unit after the preset shutdown time, and the indoor heat exchanger is configured by the outdoor control unit Work for the condenser to dry the surface of the indoor heat exchanger.
The air conditioner according to claim 2, wherein the expansion valve is controlled by the outdoor control unit to have an opening degree smaller than that of the expansion valve when the indoor heat exchanger is configured to operate the condenser The indoor heat exchanger is configured to have an opening degree when the evaporator is working.
The air conditioner according to claim 1, wherein the air conditioner further comprises:

The four-way valve is connected to the refrigerant circuit, and the four-way valve switches the flow direction of the refrigerant in the refrigerant circuit under the control of the outdoor control unit so that the indoor heat exchanger is an evaporator or a condenser jobs.
The air conditioner according to claim 1, wherein the expansion valve is controlled by the outdoor control unit so that the opening degree of the expansion valve remains unchanged during the preset shutdown time when the compressor is configured to shutdown operation.
The air conditioner according to claim 2, wherein the expansion valve is controlled by the outdoor control unit to maintain an opening degree when the indoor heat exchanger is configured to operate the condenser.