WO2024066240A1

WO2024066240A1 - Air conditioner and control method therefor

Info

Publication number: WO2024066240A1
Application number: PCT/CN2023/082743
Authority: WO
Inventors: 潘京大; 张凤娇; 刘睿
Original assignee: 海信空调有限公司
Priority date: 2022-09-28
Filing date: 2023-03-21
Publication date: 2024-04-04
Also published as: CN115468229A

Abstract

An air conditioner and a control method therefor. The air conditioner comprises a fresh air device, a refrigerant monitoring device and a controller. The fresh air device is arranged at one end of the air conditioner, the fresh air device is provided with a fresh air inlet, a fresh air outlet, an indoor air inlet and an indoor air outlet, the indoor air inlet and the indoor air outlet are configured to exhaust air to the outside of a room, and the fresh air inlet and the fresh air outlet are configured to supply air to the room. The refrigerant monitoring device is configured to monitor whether refrigerant leakage occurs in the air conditioner. The controller is configured to: acquire a refrigerant concentration, which is monitored by the refrigerant monitoring device; and if it is determined that the refrigerant concentration is greater than a first preset concentration, control the fresh air device to start up, and control the indoor air inlet and the indoor air outlet to open.

Description

Air conditioner and control method thereof

This application claims priority to Chinese patent application No. 202211196814.8 filed on September 28, 2022, the entire contents of which are incorporated by reference into this application.

Technical Field

The present disclosure relates to the technical field of air conditioning, and in particular to an air conditioner and a control method thereof.

Background technique

With the widespread use of air conditioners, users' environmental protection requirements for air conditioners are also constantly increasing. The refrigerants used in air conditioners include R32 (difluoromethane, molecular formula CH2F2) and R290 (propane, molecular formula CH3CH2CH3). R32 is flammable, and R290 is environmentally friendly and flammable. There are certain risks when the refrigerant leaks. Once the refrigerant leaks during the operation of the air conditioner, it will affect the performance of the air conditioner.

Summary of the invention

In one aspect, an air conditioner is provided, comprising an outdoor unit and an indoor unit. The indoor unit is connected to the outdoor unit, and the indoor unit comprises an indoor heat exchanger, an air supply fan, a fresh air device, a refrigerant monitoring device and a controller. The indoor heat exchanger is configured to perform heat exchange with indoor air. The air supply fan is arranged at one side of the indoor heat exchanger and is configured to provide power for air flow. The fresh air device is arranged at one end of the indoor heat exchanger and is configured to supply air to the room or exhaust air to the outside. The fresh air device comprises an air inlet channel and an air exhaust channel. The refrigerant monitoring device is configured to monitor whether refrigerant leakage occurs inside the air conditioner. The controller is coupled to the refrigerant monitoring device, the fresh air device and the air supply fan, and the controller is configured to: obtain the refrigerant concentration monitored by the refrigerant monitoring device; if it is determined that the refrigerant concentration is greater than a first preset concentration, control the fresh air device to start and open the exhaust channel; if it is determined that the refrigerant concentration is less than or equal to the first preset concentration, continue to obtain the refrigerant concentration monitored by the refrigerant monitoring device.

On the other hand, an air conditioner is provided, comprising an outdoor unit and an indoor unit. The indoor unit is connected to the outdoor unit, and the indoor unit comprises an indoor heat exchanger, an air supply fan, a fresh air device, a refrigerant monitoring device and a control device. The indoor heat exchanger is configured to perform heat exchange with indoor air. The air supply fan is arranged at one side of the indoor heat exchanger and is configured to provide power for air flow. The fresh air device is arranged at one end of the indoor heat exchanger and is configured to supply air to the room or exhaust air to the outside. The fresh air device comprises an air inlet channel and an air exhaust channel. The refrigerant monitoring device is configured to monitor whether a refrigerant leak occurs inside the air conditioner. The control device is connected to the refrigerant monitoring device, the fresh air device and the air supply fan, and the control device is configured to control the exhaust channel to be opened when a refrigerant leak occurs in the air conditioner; and to control the exhaust channel to be closed when a refrigerant leak does not occur in the air conditioner.

On the other hand, a control method of an air conditioner is provided, comprising an outdoor unit and an indoor unit. The indoor unit is connected to the outdoor unit, and the indoor unit comprises an indoor heat exchanger, an air supply fan, a fresh air device, a refrigerant monitoring device and a controller. The indoor heat exchanger is configured to perform heat exchange with indoor air. The air supply fan is arranged at one side of the indoor heat exchanger and is configured to provide power for air flow. The fresh air device is arranged at one end of the indoor heat exchanger and is configured to supply air to the room or exhaust air to the outside. The fresh air device comprises an air inlet channel and an air exhaust channel. The refrigerant monitoring device is configured to monitor whether refrigerant leakage occurs inside the air conditioner. The controller is coupled to the refrigerant monitoring device, the fresh air device and the air supply fan, and the control method comprises: obtaining the refrigerant concentration monitored by the refrigerant monitoring device; if it is determined that the refrigerant concentration is greater than a first preset concentration, controlling the fresh air device to start and open the exhaust channel; if it is determined that the refrigerant concentration is less than or equal to the first preset concentration, continuing to obtain the refrigerant concentration monitored by the refrigerant monitoring device.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required for use in some embodiments of the present disclosure. However, the drawings described below are only drawings of some embodiments of the present disclosure. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

FIG1 is a schematic diagram of an air conditioner according to some embodiments;

FIG2 is a structural diagram of an indoor unit according to some embodiments;

FIG3 is a left side view of an indoor unit according to some embodiments;

FIG4 is a top view of an indoor unit according to some embodiments;

FIG5A is a partial structural diagram of an indoor unit according to some embodiments;

FIG5B is a structural diagram of the indoor heat exchanger in FIG5A;

6A is a positional relationship diagram of an indoor heat exchanger and an air supply fan according to some embodiments (left view);

FIG6B is a block diagram of an air conditioner according to some embodiments;

FIG7 is a structural diagram of a fresh air device according to some embodiments;

8 is a working state diagram of a first switching device of a fresh air device according to some embodiments (the fresh air outlet is open and the indoor air outlet is closed);

9 is a working state diagram of a first switching component of another fresh air device according to some embodiments (the fresh air outlet is closed and the indoor air outlet is opened);

FIG10 is a schematic diagram of a first transmission member and a second transmission member of a fresh air device according to some embodiments;

FIG11 is a structural diagram of a second switching device of a fresh air device according to some embodiments (indoor air inlet is closed);

FIG12 is a structural diagram of a second switching component of another fresh air device according to some embodiments (with the indoor air inlet opened);

FIG13 is a control flow chart of a fresh air device according to some embodiments;

FIG14 is a control flow chart of another fresh air device according to some embodiments;

FIG15 is a control flow chart of yet another fresh air device according to some embodiments;

FIG. 16 is a control flow chart of yet another fresh air device according to some embodiments.

Reference numerals:
1000, air conditioner; 100, indoor unit; 12, air guide plate; 101, indoor heat exchanger; 102, indoor fan; 200,
Outdoor unit; 201, compressor; 202, four-way valve; 203, outdoor heat exchanger; 204, outdoor fan; 205, expansion valve;
10. Casing; 10A. Casing body; 11. Air outlet; 13. Indoor air inlet;
20. Indoor heat exchanger; 30. Air supply fan;
40. Fresh air device; 41. Fresh air shell; 411. Fresh air inlet; 412. Fresh air outlet; 413. Indoor air inlet;
414, indoor air outlet; 42, fresh air fan; 43, first switching device; 431, first transmission member; 432, second transmission member; 433, first switching valve; 434, first driving member; 44, second switching device; 441, second driving member; 442, second switching valve; 443, third transmission member;
50. filter screen; 60. refrigerant monitoring device; 70. controller; 300. control device.

Detailed ways

The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. The term "connected" It should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "coupled" indicates that two or more components are in direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

“At least one of A, B, and C” has the same meaning as “at least one of A, B, or C” and both include the following combinations of A, B, and C: A only, B only, C only, the combination of A and B, the combination of A and C, the combination of B and C, and the combination of A, B, and C.

“A and/or B” includes the following three combinations: A only, B only, and a combination of A and B.

The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

As used herein, "about," "substantially," or "approximately" includes the stated value and an average value that is within an acceptable range of variation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

As used herein, "parallel", "perpendicular", and "equal" include the situations described and situations similar to the situations described, and the range of the similar situations is within the acceptable deviation range, wherein the acceptable deviation range is determined by a person of ordinary skill in the art taking into account the measurement in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, wherein the acceptable deviation range of approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, wherein the acceptable deviation range of approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, the difference between the two equalities is less than or equal to 5% of either one.

Some embodiments of the present disclosure provide an air conditioner.

As shown in FIG1 , the air conditioner 1000 includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 and the outdoor unit 200 are connected by a pipeline to transmit refrigerant. The indoor unit 100 includes an indoor heat exchanger 101 and an indoor fan 102. The outdoor unit 200 includes a compressor 201, a four-way valve 202, an outdoor heat exchanger 203, an outdoor fan 204 and an expansion valve 205. The compressor 201, the outdoor heat exchanger 203, the expansion valve 205 and the indoor heat exchanger 101 connected in sequence form a refrigerant circuit, in which the refrigerant circulates and exchanges heat with the air through the outdoor heat exchanger 203 and the indoor heat exchanger 101, respectively, to realize the cooling mode or heating mode of the air conditioner 1000.

The compressor 201 is configured to compress the refrigerant so that the low-pressure refrigerant is compressed to form a high-pressure refrigerant.

The outdoor heat exchanger 203 is configured to perform heat exchange between outdoor air and the refrigerant transmitted in the outdoor heat exchanger 203. For example, the outdoor heat exchanger 203 works as a condenser in the cooling mode of the air conditioner 1000, so that the refrigerant compressed by the compressor 201 condenses by dissipating heat to the outdoor air through the outdoor heat exchanger 203. The outdoor heat exchanger 203 works as an evaporator in the heating mode of the air conditioner 1000, so that the decompressed refrigerant absorbs the heat of the outdoor air through the outdoor heat exchanger 203 and evaporates.

In some embodiments, the outdoor heat exchanger 203 further includes heat exchange fins to expand the contact area between the outdoor air and the refrigerant transmitted in the outdoor heat exchanger 203, thereby improving the heat exchange efficiency between the outdoor air and the refrigerant.

The outdoor fan 204 is configured to draw outdoor air into the outdoor unit 200 through the outdoor air inlet of the outdoor unit 200, and send the outdoor air after heat exchange with the outdoor heat exchanger 203 out through the outdoor air outlet of the outdoor unit 200. The outdoor fan 204 provides power for the flow of outdoor air.

The expansion valve 205 is connected between the outdoor heat exchanger 203 and the indoor heat exchanger 101. The opening of the expansion valve 205 adjusts the pressure of the refrigerant flowing through the outdoor heat exchanger 203 and the indoor heat exchanger 101 to adjust the flow of the refrigerant flowing between the outdoor heat exchanger 203 and the indoor heat exchanger 101. The flow and pressure of the refrigerant flowing between the outdoor heat exchanger 203 and the indoor heat exchanger 101 will affect the heat exchange performance of the outdoor heat exchanger 203 and the indoor heat exchanger 101. The expansion valve 205 can be an electronic valve. The opening of the expansion valve 205 is adjustable to control the flow and pressure of the refrigerant flowing through the expansion valve 205.

The four-way valve 202 is connected to the refrigerant circuit, and is configured to switch the flow direction of the refrigerant in the refrigerant circuit so that the air conditioner 1000 performs a cooling mode or a heating mode.

The indoor heat exchanger 101 is configured to perform heat exchange between indoor air and a refrigerant transmitted through the indoor heat exchanger 101 . For example, the indoor heat exchanger 101 works as an evaporator in the cooling mode of the air conditioner 1000, so that the refrigerant after dissipating heat through the outdoor heat exchanger 203 absorbs heat from the indoor air through the indoor heat exchanger 101 and evaporates. The indoor heat exchanger 101 works as a condenser in the heating mode of the air conditioner 1000, so that the refrigerant after absorbing heat through the outdoor heat exchanger 203 dissipates heat to the indoor air through the indoor heat exchanger 101 and condenses.

In some embodiments, the indoor heat exchanger 101 further includes heat exchange fins to expand the contact area between the indoor air and the refrigerant transmitted in the indoor heat exchanger 101, thereby improving the heat exchange efficiency between the indoor air and the refrigerant.

As shown in Fig. 1 and Fig. 2, the indoor fan 102 is configured to suck indoor air into the indoor unit 100 through the indoor air inlet 13 of the indoor unit 100 in the cooling mode or the heating mode, and send the indoor air after heat exchange with the indoor heat exchanger 101 out through the air outlet 11 of the indoor unit 100. The indoor fan 102 provides power for the flow of indoor air.

For ease of description, unless otherwise specified, the above, below, left, right, front, and back directions in this disclosure are all based on the state of the air conditioner 1000 when in use. The side of the air conditioner 1000 facing the user when in use is the front side, and the side opposite thereto is the back side. The height direction of the air conditioner 1000 is the up and down direction. The left and right direction of the air conditioner 1000 is the same as the left and right direction of the user, for example, the left side of the air conditioner 1000 is the left side of the user, and the right side of the air conditioner 1000 is the right side of the user.

Refrigerant leakage may occur during the operation of the air conditioner. Once a large amount of leaked refrigerant accumulates inside the air conditioner, there will be a risk of combustion or explosion, affecting the reliability of the air conditioner.

Typically, in the event of refrigerant leakage inside the air conditioner, the refrigerant inside the air conditioner 1000 is discharged to the outdoors by controlling the fresh air blower to reverse, thereby reducing hidden dangers during the use of the air conditioner 1000.

However, compared with the forward rotation of the fresh air fan, when the fresh air fan is reversed, the air volume of the fresh air fan will become smaller, resulting in lower air output, affecting the refrigerant discharge efficiency.

In order to solve the above problems, some embodiments of the present disclosure provide an air conditioner 1000. A refrigerant monitoring device and a fresh air device are provided inside the air conditioner 1000. When the refrigerant monitoring device detects that a refrigerant leak occurs inside the air conditioner 1000, the fresh air device is controlled to rotate the fresh air fan forward and open the exhaust passage to increase the air volume and exhaust rate, so as to quickly transport the gas with a high refrigerant concentration inside the air conditioner 1000 to the outdoors, thereby reducing the risk of refrigerant combustion or explosion and improving the reliability of the air conditioner 1000.

The air conditioner 1000 according to some embodiments of the present disclosure is described below.

As shown in FIG2 , the indoor unit 100 further includes a housing 10 and an air guide plate 12. The housing 10 includes a housing body 10A and an air outlet 11. The air outlet 11 is located below the housing body 10A. The air guide plate 12 is disposed at the air outlet 11 to open or close the air outlet 11. For example, the air guide plate 12 is configured to control the opening or closing of the air outlet 11 and the size of the air volume of the air outlet 11.

As shown in FIGS. 4 to 6A , the indoor heat exchanger 101 is disposed in the casing 10. The indoor unit 100 further includes an air supply fan 30, which is disposed in the casing 10 and is located on one side (such as the lower side) of the indoor heat exchanger 101. The air supply fan 30 is configured to provide power for the circulation of gas (such as air). For example, the air supply fan 30 is disposed near the air outlet 11. In the cooling mode or heating mode of the air conditioner 1000, the air supply fan 30 can allow indoor air to enter the air conditioner 1000 from the indoor air inlet 13, and after heat exchange (such as cooling and heating) in the indoor heat exchanger 101, the air supply fan 30 is sent into the room through the air outlet 11, so that the indoor air can circulate.

It should be noted that the air supply fan 30 includes a driving motor and an indoor fan 102 , and the driving motor is connected to the indoor fan 102 to drive the indoor fan 102 .

In this way, by arranging the air supply fan 30 on one side of the indoor heat exchanger 101, on the one hand, the internal structure of the air conditioner 1000 can be made compact, the volume of the air conditioner 1000 can be reduced, and the production and transportation of the air conditioner 1000 can be facilitated. On the other hand, the flow path of air in the air conditioner 1000 can be shortened to avoid air volume loss and wind speed reduction, thereby ensuring the air volume and air speed of the air conditioner 1000, and improving the air quality of the air conditioner 1000.

In some embodiments, since the refrigerant of the air conditioner 1000 contains a combustible substance difluoromethane and an explosive substance propane, the air conditioner 1000 further includes a flame retardant device, which is arranged at the position of the air supply fan 30. For example, the flame retardant device is made of a material having a flame retardant property, and the flame retardant device can separate the air supply fan 30 from the air. In this way, when the refrigerant leaks, the flame retardant device can prevent the refrigerant from being ignited due to the rapid operation of the air supply fan 30. Therefore, the provision of the flame retardant device can improve the reliability of the air conditioner 1000.

As shown in FIG. 5A and FIG. 5B , the air conditioner 1000 further includes a refrigerant monitoring device 60. The refrigerant monitoring device 60 is located in the indoor unit 100 and is configured to monitor whether a refrigerant leak occurs inside the air conditioner 1000. When in operation, the refrigerant monitoring device 60 continuously and periodically monitors the refrigerant concentration inside the air conditioner 1000 , which is helpful to ensure the reliability of the air conditioner 1000 .

Since the possibility of refrigerant leakage at the welding point of the indoor heat exchanger 101 is relatively high, in some embodiments, the refrigerant monitoring device 60 is disposed in the casing 10 and is located at the welding point of the casing body 10A close to the indoor heat exchanger 101 .

For example, the air conditioner 1000 includes one or more refrigerant monitoring devices 60. When the air conditioner 1000 includes multiple refrigerant monitoring devices 60, the multiple refrigerant monitoring devices 60 are respectively located at multiple welding points of the indoor heat exchanger 101. Such a configuration can improve the timeliness and accuracy of the refrigerant monitoring device 60 in monitoring the refrigerant concentration in the air conditioner 1000, and can minimize the risk of refrigerant leakage in the air conditioner 1000.

As shown in Fig. 2 to Fig. 4, the indoor unit 100 also includes a fresh air device 40. The fresh air device 40 is arranged in the casing 10 and is located at one end (the left end as shown in Fig. 4) of the indoor heat exchanger 101 along the length direction. The fresh air device 40 has a fresh air channel and an exhaust air channel. When the air conditioner 1000 includes the fresh air device 40, the air conditioner 1000 also has a fresh air mode. The fresh air device 40 is configured to open the exhaust air channel and exhaust air to the outside when a refrigerant leak occurs inside the air conditioner 1000, and, when no refrigerant leak occurs inside the air conditioner 1000, in the fresh air mode of the air conditioner 1000, open the air inlet channel and supply air to the room.

In the fresh air mode, the air conditioner 1000 can introduce fresh outdoor air into the room, effectively reduce the concentration of indoor carbon dioxide, and improve the indoor air quality. The fresh air mode can be turned on alone or together with the cooling mode or the heating mode.

When the fresh air mode is turned on alone, the fresh air device 40 opens the air inlet channel, and outdoor fresh air enters the room through the fresh air device 40.

When the fresh air mode is turned on in the cooling mode or the heating mode, the fresh air device 40 opens the air inlet channel. A portion of the outdoor fresh air enters the room after passing through the fresh air device 40. The other portion of the fresh air entering the room from the outdoor is transported to the indoor heat exchanger 101 by the air supply fan 30, and after heat exchange (such as cooling and heating) by the indoor heat exchanger 101, it is transported into the room through the air outlet 11, so that fresh air with a suitable temperature can be transported to the room.

Thus, by providing the fresh air device 40 on the indoor unit 100, the functions of the air conditioner 1000 can be enriched. In addition, the fresh air mode and the heat exchange mode of the air conditioner 1000 can be made independent of each other, thereby improving the working reliability of the air conditioner 1000.

Furthermore, by arranging the fresh air device 40 in the housing 10, the position of the fresh air device 40 can be made more secure, and shaking and noise can be reduced. In addition, by arranging the fresh air device 40 at one end of the indoor heat exchanger 101, the internal structure of the air conditioner 1000 can be improved, so that the fresh air device 40 and the indoor heat exchanger 101 do not affect each other during operation.

As shown in Figures 2 and 3, the fresh air device 40 includes a fresh air housing 41. The fresh air housing 41 can define a working space for the fresh air device 40 that is different from the air supply fan 30, so that the fresh air device 40 and the air supply fan 30 do not interfere with each other and are independent of each other, so that the fresh air device 40 can be selectively turned on or off.

As shown in Figures 9 and 12, the fresh air housing 41 has a fresh air inlet 411, a fresh air outlet 412, an indoor air inlet 413 and an indoor air outlet 414. The fresh air inlet 411 is connected to the fresh air outlet 412 to form an air inlet passage, and the indoor air inlet 413 is connected to the indoor air outlet 414 to form an air exhaust passage.

As shown in FIG. 4 and FIG. 7 , the fresh air inlet 411 is connected to the outside through a pipeline, and the fresh air inlet 411 is located on one side (such as the rear side) of the fresh air device 40, and the fresh air outlet 412 is located on the other side (such as the upper side) of the fresh air device 40. In this way, outdoor air can enter the fresh air device 40 through the fresh air inlet 411, and then flow into the room through the fresh air outlet 412.

As shown in Fig. 8 and Fig. 9, the indoor air outlet 414 is located at one side (such as the rear side) of the fresh air device 40, and the indoor air outlet 414 is connected to the outside through a pipeline. The indoor air outlet 414 is arranged at the same side as the side where the fresh air inlet 411 is located, so that the structure of the fresh air device 40 can be more compact. In addition, the indoor air outlet 414 and the fresh air inlet 411 can share a hole to communicate with the outside, so that the operation of drilling a hole on the wall when installing the indoor unit 100 can be omitted, which is convenient for the installation of the indoor unit 100.

As shown in FIG. 12 , the indoor air inlet 413 is located on the side of the fresh air device 40 close to the indoor heat exchanger 101 (such as the right side of the fresh air device). If a refrigerant leak occurs in the air conditioner 1000, the leaked refrigerant can enter the fresh air device 40 through the indoor air inlet 413, and then be discharged to the outside through the indoor air outlet 414. In this way, the air containing the leaked refrigerant in the air conditioner 1000 can be led to the outside through the fresh air device 40, thereby reducing the refrigerant concentration inside the air conditioner 1000, reducing the risk of refrigerant explosion, and effectively preventing the refrigerant from spreading indoors. Since the refrigerants R290 and R32 are environmentally friendly Therefore, the small amount of leaked refrigerant is discharged to the outside, which has little impact on the outdoor environment.

According to the air conditioner 1000 of some embodiments of the present disclosure, by arranging the fresh air inlet 411, the fresh air outlet 412, the indoor air inlet 413 and the indoor air outlet 414 on the fresh air housing 41, on one hand, it is convenient to produce and install the fresh air device 40. On the other hand, the flow path (i.e., the fresh air duct) of air flowing from the fresh air inlet 411 to the fresh air outlet 412 and the flow path (i.e., the exhaust air duct) of air flowing from the indoor air inlet 413 to the indoor air outlet 414 can share the internal space of the fresh air device 40, thereby simplifying the structure of the fresh air device 40 and reducing the space occupied by the fresh air device 40 in the indoor unit 100.

Furthermore, by reasonably arranging the fresh air inlet 411, the fresh air outlet 412, the indoor air inlet 413 and the indoor air outlet 414, the air flow path in the fresh air device 40 does not have a large angle turn. On the one hand, the air output of the fresh air device 40 can be increased, so that the fresh air device 40 can quickly deliver fresh air into the room and quickly lead the refrigerant to the outside. On the other hand, the structure of the fresh air device 40 can be simplified, and the installation efficiency of the air conditioner 1000 can be improved.

In some embodiments, referring to FIG. 6B , the air conditioner 1000 further includes a control device 300, which is connected to the refrigerant monitoring device 60, the fresh air device 40, and the air supply fan 30. The control device 300 is configured to control the exhaust passage to open when a refrigerant leak occurs in the air conditioner 1000; and to control the exhaust passage to close when a refrigerant leak does not occur in the air conditioner 1000. In this way, the refrigerant leaked from the air conditioner 1000 can be discharged, reducing the risk of refrigerant explosion.

In some embodiments, the air conditioner 1000 further includes a controller 70. For example, the control device described above may be a controller, etc. The controller 70 includes a processor. The processor may include a central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), and may be configured to perform corresponding operations described in the controller 70 when the processor executes a program stored in a non-transitory computer readable medium coupled to the controller 70.

As shown in FIGS. 7 to 9 , the fresh air device 40 further includes a fresh air fan 42, which is disposed in the fresh air housing 41. For example, the fresh air fan 42 is a centrifugal fan. The controller 70 is coupled to the fresh air fan 42 to control the opening or closing of the fresh air fan 42. The fresh air fan 42 can increase the gas pressure and exhaust the gas by inputting mechanical energy, and can quickly lead the outdoor air to the room, thereby achieving the purpose of the air conditioner 1000 delivering fresh air to the room, and can also quickly lead the refrigerant leaked from the air conditioner 1000 to the outside, thereby achieving the purpose of reducing the refrigerant concentration in the air conditioner 1000, and then the air intake and air outlet of the fresh air device 40 can be guaranteed.

In some embodiments, as shown in FIG. 10 , the fresh air device 40 further includes a first switching device 43, which is disposed in the fresh air housing 41 and is configured to selectively open the fresh air outlet 412 and the indoor air outlet 414, and the first switching device 43 is coupled to the controller 70. In this way, the controller 70 can control the first switching device 43 so that the first switching device 43 switches to different working states under different working modes of the fresh air device 40. For example, the controller 70 can selectively open the fresh air outlet 412 and the indoor air outlet 414 by controlling the first switching device 43, so as to realize the function of the fresh air device 40 supplying air to the room or guiding the leaked refrigerant to the outside.

As shown in FIGS. 8 to 10 , the first switching device 43 includes a first driving member 434, a first transmission member 431, a second transmission member 432 and a first switching valve 433. The first driving member 434 is connected to the first transmission member 431 to drive the first transmission member 431, and the second transmission member 432 is connected to the first switching valve 433 to drive the first switching valve 433. In addition, the first transmission member 431 and the second transmission member 432 are in transmission cooperation so that the first switching valve 433 selectively opens the fresh air outlet 412 and the indoor air outlet 414. The first driving member 434 is coupled to the controller 70, for example, the first driving member 434 is a motor.

It should be noted that the first switching valve 433 in Figure 8 is in a state of opening the fresh air outlet 412 and closing the indoor air outlet 414; the first switching valve 433 in Figure 9 is in a state of opening the indoor air outlet 414 and closing the fresh air outlet 412.

The controller 70 controls the rotation of the first driving member 434, and the first driving member 434 drives the first transmission member 431 to drive the second transmission member 432 to move through the first transmission member 431. When the second transmission member 432 moves, it will drive the first switching valve 433 to move, and then the position of the first switching valve 433 can be adjusted to selectively open the fresh air outlet 412 and the indoor air outlet 414.

In this way, the controller 70 controls the fresh air outlet 412 and the indoor air outlet 414 to selectively open, that is, when the fresh air outlet 412 is opened, the indoor air outlet 414 is closed, and when the indoor air outlet 414 is opened, the fresh air outlet 412 is closed. It can be ensured that one of the fresh air outlet 412 and the indoor air outlet 414 discharges air alone, so that the air outlet direction of the fresh air device 40 can be changed without changing the rotation direction of the fresh air fan 42 in the fresh air housing 41, and the air circulation direction of the air when the air conditioner 1000 is in different working modes can be changed, and the structure is compact and the reliability is good.

As shown in FIG10 , the first transmission member 431 is a gear, and the second transmission member 432 is a rack. For example, the rack is integrally formed on the first switching valve 433 .

In this way, through the cooperation of the gear and the rack, on the one hand, the structure of the first transmission member 431 and the second transmission member 432 can be made simpler, saving production costs. On the other hand, the transmission efficiency of the first transmission member 431 and the second transmission member 432 can be improved, and the output power of the first driving member can be improved, thereby improving the response speed of the first switching valve 433 to selectively open the fresh air outlet 412 and the indoor air inlet 413, so that the fresh air device 40 can switch between different working states more quickly.

In addition, by integrally molding the second transmission member 432 as a rack on the first switching valve 433, the connection strength between the second transmission member 432 and the first switching valve 433 can be enhanced, and the carrying capacity of the first transmission member 431 and the second transmission member 432 during transmission coordination can be improved, so as to improve the reliability of the first transmission member 431 and the second transmission member 432, thereby improving the working stability of the air conditioner 1000.

As shown in FIGS. 11 and 12 , the fresh air device 40 further includes a second switching device 44 , which is disposed in the fresh air housing 41 and configured to selectively open or close the indoor air inlet 413 . The second switching device 44 is coupled to the controller 70 .

When the controller 70 determines that there is no refrigerant leakage in the air conditioner 1000, for example, when the refrigerant concentration in the air conditioner 1000 is lower than or equal to the first preset concentration, the second switching device 44 closes the indoor air inlet 413, so that air can enter the fresh air device 40 from the outside through the fresh air inlet 411, and then flow into the room from the fresh air outlet 412, thereby ensuring the normal operation of the fresh air mode of the air conditioner 1000.

When the refrigerant monitoring device 60 detects refrigerant leakage near the indoor heat exchanger 101, for example, when the refrigerant concentration in the air conditioner 1000 is greater than the first preset concentration, the controller 70 can control the second switching device 44 to open the indoor air inlet 413, so that the air in the air conditioner 1000 flows from the indoor air inlet 413 into the fresh air device 40, and then flows to the outdoors from the indoor air outlet 414, thereby discharging the leaked refrigerant in the air conditioner 1000 and reducing the indoor refrigerant concentration.

As shown in Fig. 11 and Fig. 12, the second switching device 44 includes a second driving member 441, a third transmission member and a second switching valve 442. The second driving member 441 is connected to the third transmission member 443 to drive the third transmission member. The third transmission member is in transmission cooperation with the second switching valve 442. The second switching valve 442 selectively opens or closes the indoor air inlet 413. The second driving member 441 is coupled to the controller 70. For example, the second driving member 441 is a motor.

In this way, the second driving member 441 can drive the third transmission member 443 to move, so that the third transmission member 443 drives the second switching valve 442 to move, so that the first switching valve 433 selectively opens or closes the indoor air inlet 413, and selective air intake of the indoor air inlet 413 can be ensured. In addition, when there is refrigerant leakage in the air conditioner 1000, the air inlet of the fresh air device 40 can be changed through the first switching valve 433, thereby changing the air outlet direction of the fresh air device 40, so that the fresh air device 40 discharges the leaked refrigerant in the air conditioner 1000 to the outside.

It can be understood that the first switching device 43 and the second switching device 44 cooperate with each other to achieve the purpose of opening one of the air inlet channel and the air exhaust channel of the fresh air device 40.

When the fresh air device 40 supplies air to the room in the fresh air mode, the first switching device 43 opens the fresh air outlet 412 and closes the indoor air outlet 414, and the second switching device 44 closes the indoor air inlet 413. At this time, the fresh air inlet 411 and the fresh air outlet 412 are connected, and the air inlet channel is opened, so that the fresh air can be delivered to the room through the fresh air inlet 411 and the fresh air outlet 412.

When the fresh air device 40 exhausts air to the outside, the first switching device 43 closes the fresh air outlet 412 and opens the indoor air outlet 414, and the second switching device 44 opens the indoor air inlet 413. At this time, the indoor air inlet 413 and the indoor air outlet 414 are connected, and the exhaust passage is opened, so that the indoor air can be sent to the outside through the indoor air inlet 413 and then the indoor air outlet 414.

As shown in FIG. 7 , the fresh air device 40 further includes a filter 50, which is configured to filter impurities in the air. In this way, after the outdoor air enters the fresh air device 40 from the fresh air inlet 411, it can be filtered through the filter 50, which can prevent the fresh air device 40 from being damaged due to foreign matter in the outdoor air entering the fresh air device 40. In addition, by filtering the outdoor air through the filter 50 and then flowing into the room from the fresh air outlet 412, it is beneficial to improve the cleanliness of the indoor air.

In some embodiments, the controller 70 is coupled to the refrigerant monitoring device 60, and the controller 70 is configured to: obtain the refrigerant concentration monitored by the refrigerant monitoring device 60, and determine whether the refrigerant concentration is greater than a first preset concentration; if so, the controller 70 controls the fresh air device 40 to turn on, and opens the indoor air inlet 413 and the indoor air outlet 414.

As shown in FIG. 13 , the control method of the controller 70 includes steps S101 to S103 .

Step S101, obtaining the refrigerant concentration monitored by the refrigerant monitoring device 60.

Step S102, determining whether the refrigerant concentration is greater than a first preset concentration. If yes, executing step S103; if no, continuing to executing step S101.

Step S103, control the fresh air device 40 to turn on, and open the exhaust passage.

According to the control method of the air conditioner 1000 of some embodiments of the present disclosure, by coupling the controller 70 with the refrigerant monitoring device 60, it is convenient to monitor the refrigerant concentration in the air conditioner 1000 through the refrigerant monitoring device 60. The controller 70 is preset with a first preset concentration. When the controller 70 determines that the refrigerant concentration is greater than the first preset concentration, the controller 70 issues a control instruction to turn on the fresh air device 40 and open the exhaust passage (i.e., open the indoor air inlet 413 and the indoor air outlet 414). At this time, the fresh air fan 42 is started to guide the air in the air conditioner 1000 to the outside along the flow direction of the indoor air inlet 413, the fresh air device 40 and the indoor air outlet 414. Thus, the leaked refrigerant can be discharged through the fresh air device 40, thereby preventing the refrigerant from diffusing indoors, reducing the refrigerant concentration in the air conditioner 1000, and improving the reliability of the air conditioner 1000 during operation.

In some embodiments, when the refrigerant monitoring device 60 detects that the refrigerant concentration in the air conditioner 1000 is greater than a first preset concentration, the controller 70 is also configured to control the air conditioner 1000 to send a warning message to the indoor user, and can feed back the refrigerant leakage risk signal to the air conditioning maintenance department through the network to eliminate the risk for the user as soon as possible. In this way, the reliability of the use of the air conditioner 1000 can be further improved.

In some embodiments, when refrigerant leakage occurs inside the air conditioner 1000, the controller 70 is also configured to open the air guide plate 12, so as to prevent the local refrigerant concentration inside the air conditioner 1000 from being too high due to spatial ventilation differences, thereby preventing the refrigerant from burning or exploding.

In some embodiments, as shown in FIG. 14 , the control method of the controller 70 includes steps S201 to S205 .

Step S201, determining that the refrigerant concentration is greater than a first preset concentration.

Step S202, controlling the air guide plate 12 to open to a first preset position.

Step S203, determining whether the compressor 201 is running. If yes, executing step S204; if no, executing step S205.

Step S204, control the compressor 201 to be turned off, and then execute step S205.

Step S205, controlling the fresh air device 40 to turn on, and controlling the exhaust passage to open.

In this way, when the controller 70 determines that the refrigerant concentration is greater than the first preset concentration, the controller preferentially controls the air guide plate 12 to open, thereby ensuring the reliability of the working environment when the air conditioner 1000 leads out the leaked refrigerant.

The controller 70 determines whether the compressor 201 is running. When the controller 70 determines that the compressor 201 is running, the controller 70 controls the compressor 201 to be turned off, so that the cooling or heating operation of the air conditioner 1000 can be stopped, thereby maintaining the stability of the internal environment of the air conditioner 1000 in advance.

After the compressor 201 is turned off, the controller 70 controls the fresh air device 40 to turn on and controls the exhaust duct to open. In this way, the wind in the air conditioner 1000 can be guided to the outdoors along the flow direction of the indoor air inlet 413, the fresh air device 40 and the indoor air outlet 414, thereby reducing the refrigerant concentration in the air conditioner 1000 and improving the reliability of the air conditioner 1000 during operation.

In some embodiments, the refrigerant concentration may be too high. In order to quickly reduce the refrigerant concentration inside the air conditioner 1000, the controller 70 is further configured to: if it is determined that the refrigerant concentration is greater than a second preset concentration, control the air guide plate 12 to open to a second preset position, and control the air supply fan 30 to work until it is determined that the refrigerant concentration is lower than the second preset concentration. It should be noted that the second preset concentration is greater than the first preset concentration.

As shown in FIG. 15 , the control method of the controller 70 further includes steps S301 to S305 .

Step S301, determining that the refrigerant concentration is greater than a second preset concentration.

Step S302, controlling the air guide plate 12 to open to a second preset position.

It should be noted that when the air guide plate 12 is in the second preset position, the air volume of the air conditioner 1000 is greater than the air volume when the air guide plate 12 is in the first preset position. This is conducive to increasing the air volume of the air conditioner 1000, accelerating the discharge speed of the refrigerant, and thus reducing the refrigerant concentration.

Step S303, determining whether the compressor 201 is running. If yes, executing step S304; if no, executing step S305.

Step S304, control the compressor 201 to be turned off, and then proceed to step S305.

Step S305, controlling the air supply fan 30 to turn on until it is determined that the refrigerant concentration is lower than the second preset concentration.

In this way, when the controller 70 determines that the refrigerant concentration measured by the refrigerant monitoring device 60 is greater than the second preset concentration, the controller 70 preferentially controls the air guide plate 12 to open to the second preset position, and controls the air supply fan 30 to operate to increase the air outlet of the air conditioner 1000, thereby quickly reducing the refrigerant concentration in the air conditioner 1000.

The controller 70 determines whether the compressor 201 is running. When the controller 70 determines that the compressor 201 is running, the controller 70 controls the compressor 201 to shut down. In this way, the cooling or heating operation of the air conditioner 1000 can be stopped to prevent the refrigerant leaking from the air conditioner 1000 from being introduced into the room from the outdoor air, causing hidden dangers.

After the controller 70 controls the compressor 201 to turn off, the controller 70 controls the air supply fan 30 to turn on. In this way, the air supply volume of the air conditioner 1000 can be increased, the refrigerant concentration inside the air conditioner 1000 can be quickly reduced, and the possibility of dangerous refrigerant combustion and explosion caused by excessive concentration of leaked refrigerant in the air conditioner 1000 is reduced. The air supply fan 30 is turned on until the concentration of leaked refrigerant in the air conditioner 1000 is lower than the second preset concentration.

In some embodiments, after the controller 70 determines that the refrigerant concentration is greater than the first preset concentration, controls the fresh air device 40 to turn on, and controls the indoor air inlet 413 and the indoor air outlet 414 to open (such as step S103), the controller 70 is further configured to: determine the relationship between the refrigerant concentration and the third preset concentration; if it is determined that the refrigerant concentration is lower than the third preset concentration, control the fresh air device 40 to turn off. It should be noted that the third preset concentration can be lower than the first preset concentration.

As shown in FIG. 16 , the control method of the controller 70 further includes steps S401 to S404 .

Step S401, obtaining the refrigerant concentration monitored by the refrigerant monitoring device 60.

Step S402, determining whether the refrigerant concentration is less than a third preset concentration, if so, executing step S403; if not, executing step S404.

Step S403, controlling the fresh air device 40 to be closed, and controlling the indoor air inlet 413 to be closed.

Step S404, controlling the fresh air device 40 to continue opening the exhaust passage to exhaust air to the outdoors.

In this way, after the controller 70 determines that the refrigerant concentration is greater than the first preset concentration through the refrigerant monitoring device 60, the controller 70 controls the fresh air device 40 to open, and controls the indoor air inlet 413 and the indoor air outlet 414 to open, so as to guide the air in the air conditioner 1000 to the outside, and the controller 70 determines the relationship between the refrigerant concentration and the third preset concentration through the refrigerant monitoring device 60. After the refrigerant monitoring device 60 measures at equal time intervals to determine that the refrigerant concentration is lower than the third preset concentration, the controller 70 controls the fresh air device 40 to close, and the active control of the fresh air device 40 by the controller 70 ends at this time. The control steps of the controller 70 can enable the air conditioner 1000 to have a good active control capability, and can effectively control the risk of refrigerant leakage of the air conditioner 1000.

Those skilled in the art will understand that the disclosure scope of the present invention is not limited to the above specific embodiments, and certain elements of the embodiments may be modified and replaced without departing from the spirit of the present application. The scope of the present application is limited by the appended claims.

Claims

An air conditioner, comprising:

outdoor unit; and

An indoor unit is connected to the outdoor unit, and the indoor unit comprises:

an indoor heat exchanger configured to exchange heat with indoor air;

an air supply fan, disposed on one side of the indoor heat exchanger and configured to provide power for air flow;

A fresh air device is arranged at one end of the indoor heat exchanger and is configured to supply air to the room or exhaust air to the outside; the fresh air device includes an air inlet channel and an air exhaust channel;

a refrigerant monitoring device configured to monitor whether refrigerant leakage occurs inside the air conditioner; and

A controller is coupled to the refrigerant monitoring device, the fresh air device and the air supply fan, and the controller is configured as follows:

Obtaining the refrigerant concentration monitored by the refrigerant monitoring device;

If it is determined that the refrigerant concentration is greater than the first preset concentration, the fresh air device is controlled to start and the exhaust passage is opened;

If it is determined that the refrigerant concentration is less than or equal to the first preset concentration, the refrigerant concentration monitored by the refrigerant monitoring device continues to be obtained.
The air conditioner according to claim 1, wherein the indoor unit further comprises a casing, the casing comprises an air outlet, the air conditioner further comprises an air guide plate and a compressor, the air guide plate is arranged at the air outlet and is configured to adjust the air volume of the air outlet;

If it is determined that the refrigerant concentration is greater than the first preset concentration, the fresh air device is controlled to be turned on and the exhaust passage is opened, including:

Determining that the refrigerant concentration is greater than the first preset concentration;

Controlling the air guide plate to open to a first preset position;

If it is determined that the compressor is running, controlling the compressor to be turned off;

The fresh air device is controlled to be turned on, and the exhaust passage is controlled to be opened.
The air conditioner according to claim 2, wherein the controller is further configured to:

If it is determined that the refrigerant concentration is greater than the second preset concentration, the air guide plate is controlled to open to the second preset position, and the air supply fan is controlled to operate until it is determined that the refrigerant concentration is lower than the second preset concentration; wherein the first preset concentration is lower than the second preset concentration.
The air conditioner according to claim 3, wherein if it is determined that the refrigerant concentration is greater than a second preset concentration, the air guide plate is controlled to open to a second preset position, and the air supply fan is controlled to operate until it is determined that the refrigerant concentration is lower than the second preset concentration, comprising:

Determining that the refrigerant concentration is greater than the second preset concentration;

Controlling the air guide plate to open to a second preset position;

If it is determined that the compressor is running, controlling the compressor to be turned off;

The air supply fan is controlled to operate until it is determined that the refrigerant concentration is lower than the second preset concentration.
The air conditioner according to any one of claims 1 to 4, wherein after determining that the refrigerant concentration is greater than a first preset concentration, controlling the fresh air device to start, and opening the exhaust passage, the controller is further configured to:

If it is determined that the refrigerant concentration is lower than a third preset concentration, the fresh air device is controlled to be turned off; wherein the third preset concentration is lower than the first preset concentration.
An air conditioner, comprising:

outdoor unit; and

An indoor unit is connected to the outdoor unit, and the indoor unit comprises:

an indoor heat exchanger configured to exchange heat with indoor air;

an air supply fan, disposed on one side of the indoor heat exchanger and configured to provide power for air flow;

A fresh air device, disposed at one end of the indoor heat exchanger, configured to supply air to the room or exhaust air to the outside, the fresh air device comprising an air inlet channel and an air exhaust channel;

a refrigerant monitoring device configured to monitor whether refrigerant leakage occurs inside the air conditioner; and

A control device is connected to the refrigerant monitoring device, the fresh air device and the air supply fan. The control device is configured to control the exhaust passage to be opened when a refrigerant leak occurs in the air conditioner; and to control the exhaust passage to be closed when no refrigerant leak occurs in the air conditioner.
The air conditioner according to claim 6, wherein the fresh air device comprises:

Fresh air inlet, connected to the outdoors;

A fresh air outlet is connected to the room, and the fresh air inlet is connected to the fresh air outlet to form the air inlet channel;

an indoor air inlet, connected to the indoor room and arranged close to the indoor heat exchanger; and

The indoor air outlet is connected to the outside, and the indoor air inlet is connected to the indoor air outlet to form the exhaust passage.
The air conditioner according to claim 7, wherein the indoor unit further comprises a casing, and the fresh air device further comprises:

A fresh air shell, the fresh air shell is arranged in the casing, the fresh air inlet, the fresh air outlet, the indoor air inlet and the indoor air outlet are arranged on the fresh air shell;

A fresh air fan, disposed in the fresh air housing, configured to provide power to the fresh air device in the process of supplying air to the indoor room or exhausting air to the outdoor room; and

The first switching device is disposed in the fresh air housing and is configured to selectively open the fresh air outlet and the indoor air outlet; wherein,

The fresh air blower and the first switching device are respectively connected to the control device.
The air conditioner according to claim 8, wherein the first switching device comprises:

a first driving member, the control device being connected to the first driving member;

a first transmission member, wherein the first driving member is connected to the first transmission member to drive the first transmission member;

a first switching valve configured to selectively open the fresh air outlet and the indoor air outlet; and

A second transmission member, wherein the second transmission member is connected to the first switching valve and is in transmission connection with the first transmission member.
The air conditioner according to claim 9, wherein the first transmission member is a gear and the second transmission member is a rack.
The air conditioner according to claim 10, wherein the rack and the first switching valve are integrated into one piece.
The air conditioner according to any one of claims 8 to 11, wherein the fresh air device further comprises a second switching device, the second switching device is disposed on the fresh air housing and is configured to selectively open the indoor air inlet, and the second switching device is connected to the control device.
The air conditioner according to claim 12, wherein the second switching device comprises:

a second driving member, the control device being connected to the second driving member;

a second switching valve configured to selectively open the indoor air inlet; and

The second driving member is connected to the third driving member to drive the third driving member, and the third driving member is drivingly connected to the second switching valve.
A method for controlling an air conditioner, comprising:

outdoor unit; and

An indoor unit is connected to the outdoor unit, and the indoor unit comprises:

an indoor heat exchanger configured to perform heat exchange between indoor air and a refrigerant transmitted in the indoor heat exchanger;

an air supply fan, disposed on one side of the indoor heat exchanger and configured to provide power for air flow;

A fresh air device, disposed at one end of the indoor heat exchanger, configured to supply air to the room or exhaust air to the outside, the fresh air device comprising an air inlet channel and an air exhaust channel;

a refrigerant monitoring device configured to monitor whether refrigerant leakage occurs inside the air conditioner; and

A controller is coupled to the refrigerant monitoring device, the fresh air device and the air supply fan, and the control method includes:

Obtaining the refrigerant concentration monitored by the refrigerant monitoring device;

If it is determined that the refrigerant concentration is greater than the first preset concentration, the fresh air device is controlled to start and the exhaust passage is opened;

If it is determined that the refrigerant concentration is less than or equal to the first preset concentration, the refrigerant concentration monitored by the refrigerant monitoring device continues to be obtained.
The control method according to claim 14, wherein the indoor unit further comprises a casing, the casing comprises an air outlet, the air conditioner further comprises an air guide plate and a compressor, the air guide plate is arranged at the air outlet and is configured to adjust the air volume of the air outlet;

If it is determined that the refrigerant concentration is greater than the first preset concentration, the step of controlling the fresh air device to turn on and opening the exhaust passage comprises:

Determining that the refrigerant concentration is greater than the first preset concentration;

Controlling the air guide plate to open to a first preset position;

If it is determined that the compressor is running, controlling the compressor to be turned off;

The fresh air device is controlled to be turned on, and the exhaust passage is controlled to be opened.
The control method according to claim 15, wherein:

The control method further comprises:

If it is determined that the refrigerant concentration is greater than the second preset concentration, the air guide plate is controlled to open to the second preset position, and the air supply fan is controlled to operate until it is determined that the refrigerant concentration is lower than the second preset concentration; wherein,

The first preset concentration is lower than the second preset concentration.
The control method according to claim 16, wherein:

If it is determined that the refrigerant concentration is greater than a second preset concentration, the step of controlling the air guide plate to open to a second preset position and controlling the air supply fan to operate until it is determined that the refrigerant concentration is lower than the second preset concentration includes:

Determining that the refrigerant concentration is greater than the second preset concentration;

Controlling the air guide plate to open to a second preset position;

If it is determined that the compressor is running, controlling the compressor to be turned off;

The air supply fan is controlled to operate until it is determined that the refrigerant concentration is lower than the second preset concentration.
The control method according to claim 14, wherein after determining that the refrigerant concentration is greater than a first preset concentration, controlling the fresh air device to start and opening the exhaust passage, the control method further comprises:

If it is determined that the refrigerant concentration is lower than a third preset concentration, the fresh air device is controlled to be closed; wherein the third preset concentration is lower than the first preset concentration.