阅读说明：本技术 一种空调系统及空调用空气净化控制方法 (Air conditioning system and air purification control method for air conditioner ) 是由 牛世波 屈乐建 苑志超 于 2021-06-23 设计创作，主要内容包括：本发明公开了一种空调系统及空调用空气净化控制方法,所述空调系统包括,送风风道、杀菌模块、回风风道、空气检测模块、排风风道、新风风道、环境质量检测模块、第一风阀、第二风阀和第三风阀,所述方法包括：当环境质量检测模块检测到新风风道内的CO2浓度和PM2.5浓度小于空气检测模块检测到回风风道内的CO2浓度和PM2.5浓度,且小于空气处理空间内预设的CO2值和PM2.5值,控制第一风阀开启；当环境质量检测模块检测到新风风道内的CO2浓度和PM2.5浓度大于空气检测模块检测到回风风道内的CO2浓度和PM2.5浓度,或大于空气处理空间内预设的CO2值和PM2.5值,控制第一风阀关闭。从而实现空调器在调节室温的同时能够更好的净化室内空气,提高用户舒适度。(The invention discloses an air conditioning system and an air purification control method for the air conditioning, wherein the air conditioning system comprises an air supply duct, a sterilization module, a return air duct, an air detection module, an air exhaust duct, a fresh air duct, an environment quality detection module, a first air valve, a second air valve and a third air valve, and the method comprises the following steps: when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are smaller than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module and are smaller than a CO2 value and a PM2.5 value preset in an air processing space, the first air valve is controlled to be opened; when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are greater than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module, or the concentration of CO2 and the concentration of PM2.5 preset in the air processing space, the first air valve is controlled to be closed. Therefore, the air conditioner can better purify indoor air while adjusting the room temperature, and the comfort level of a user is improved.)

1. An air conditioning system, includes machine in the air conditioning, its characterized in that includes:

the air supply duct is communicated with the air outlet side of the indoor unit of the air conditioner and the air inlet side of the air processing space;

the sterilization module is arranged in the air supply duct;

the air return duct is communicated with the air outlet side of the air processing space and the air return side of the indoor unit of the air conditioner;

the air detection module is arranged in the return air duct;

the air exhaust duct is communicated with the return air duct;

the fresh air duct is communicated with the outdoor and the return air duct;

the environment quality detection module is arranged in the fresh air duct;

the first air valve is arranged in the fresh air duct and used for controlling the opening and closing of the fresh air duct;

the second air valve is arranged in the air exhaust air duct and used for controlling the opening and closing of the air exhaust air duct;

and the third air valve is arranged in the return air duct and is positioned between the air flow channels of the exhaust air duct and the fresh air duct.

2. The air conditioning system as claimed in claim 1, wherein the sterilizing module includes an ultraviolet lamp and the photocatalytic filter, the ultraviolet lamp is connected to the indoor unit fan and can receive the rotation speed signal of the indoor unit, and the brightness of the ultraviolet lamp is adjusted based on the rotation speed of the indoor unit fan.

3. The air conditioning system of claim 1, further comprising:

and the filter screen is arranged in the return air duct and is positioned on the return air side branch flow passage of the indoor unit of the air conditioner, and the filter screen is communicated with the fresh air duct and is used for filtering PM2.5 and dust.

4. The air conditioning system as claimed in claim 1, wherein the air conditioning system includes a full air mode, and when the air conditioner enters the full air mode, the first air valve and the second air valve are opened, and the third air valve is closed.

5. An air purification control method for an air conditioner comprises an air conditioner indoor unit and is characterized in that,

the method comprises the following steps:

the air return duct is communicated with the air outlet side of the air processing space and the air return side of the indoor unit of the air conditioner;

the air detection module is arranged in the return air duct;

the fresh air duct is communicated with the outdoor and the return air duct;

the environment quality detection module is arranged in the fresh air duct;

the first air valve is arranged in the fresh air duct and used for controlling the opening and closing of the fresh air duct;

the method comprises the following steps:

when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are smaller than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module and smaller than a CO2 value and a PM2.5 value preset in an air processing space, the first air valve is controlled to be opened;

when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are greater than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module, or the concentration of CO2 and the concentration of PM2.5 preset in the air processing space, the first air valve is controlled to be closed.

6. The method of claim 5, wherein the method further comprises:

the fan rotating speed signal based on the output port of the indoor unit adjusts the light brightness of the ultraviolet lamp, and the light tube based on the ultraviolet lamp irradiates the photocatalytic filter, so that the surface of the photocatalytic filter forms active hydroxyl with extremely strong oxidizing capability, bacteria and organic pollutants in air supply are decomposed and removed, and the ultraviolet lamp and the photocatalytic filter are both arranged at the output port of the indoor unit.

7. The method as claimed in claim 6, wherein the adjusting of the brightness of the ultraviolet lamp based on the fan speed signal at the output port of the indoor unit comprises:

when the wind speed corresponding to the fan rotating speed signal is reduced, reducing the power of the ultraviolet lamp and reducing the brightness of the ultraviolet lamp;

and when the wind speed corresponding to the fan rotating speed signal is increased, increasing the power of the ultraviolet lamp and improving the brightness of the ultraviolet lamp.

8. The method of claim 5, wherein the method further comprises:

and when the air conditioning system enters the fresh air mode, opening the first air valve and the second air valve, and closing the third air valve.

Technical Field

The application relates to the field of air conditioner control, in particular to an air conditioning system and an air purification control method for an air conditioner.

Background

With the improvement of living standard, people pay more and more attention to indoor air purification in daily life. The air conditioner is used as an auxiliary tool for people's life, the performance of the air conditioner is higher, for an indoor unit of the air conditioner with larger capacity, a longer air pipe is usually connected when the air conditioner is used, air is supplied to each room through each air pipe, the air cleanliness of each room is easy to be insufficient by using a mode of supplying air to each room by using one set of air conditioning system, therefore, the air conditioner is expected to better purify the indoor air while adjusting the room temperature,

in the prior art, in order to better purify indoor air while adjusting the room temperature of an air conditioner indoor unit, an air purification module is arranged in an air conditioner, but the air purification module is mostly simply arranged, has low purification efficiency and needs to be frequently replaced.

Therefore, how to purify indoor air efficiently and solve the room air cleanliness is a technical problem to be solved at present.

Disclosure of Invention

The invention provides an air conditioning system, which is used for solving the technical problem that indoor air cannot be efficiently purified in the prior art, and comprises:

the air supply duct is communicated with the air outlet side of the indoor unit of the air conditioner and the air inlet side of the air processing space;

the sterilization module is arranged in the air supply duct;

the air return duct is communicated with the air outlet side of the air processing space and the air return side of the indoor unit of the air conditioner;

the air detection module is arranged in the return air duct;

the air exhaust duct is communicated with the return air duct;

the fresh air duct is communicated with the outdoor and the return air duct;

the environment quality detection module is arranged in the fresh air duct;

the first air valve is arranged in the fresh air duct and used for controlling the opening and closing of the fresh air duct;

the second air valve is arranged in the air exhaust air duct and used for controlling the opening and closing of the air exhaust air duct;

and the third air valve is arranged in the return air duct and is positioned between the air flow channels of the exhaust air duct and the fresh air duct.

In some embodiments, the sterilization module includes an ultraviolet lamp and the photocatalytic filter, the ultraviolet lamp is connected to the indoor unit fan of the air conditioner and can receive a rotation speed signal of the indoor unit of the air conditioner, and the brightness of the ultraviolet lamp is adjusted based on the rotation speed of the indoor unit fan of the air conditioner.

In some embodiments, the air conditioning system further comprises:

and the filter screen is arranged in the return air duct and is positioned on the return air side branch flow passage of the indoor unit of the air conditioner, and the filter screen is communicated with the fresh air duct and is used for filtering PM2.5, dust and the like.

In some embodiments, the air conditioning system includes a full air mode, and when the air conditioner enters the full air mode, the first air valve and the second air valve are opened, and the third air valve is closed.

Correspondingly, the invention also provides an air purification control method for an air conditioner, which comprises an air conditioner indoor unit, wherein the method is applied to an air conditioning system comprising an air supply duct, a sterilization module, a return air duct, an air detection module, an air exhaust duct, a fresh air duct, an environment quality detection module, a first air valve, a second air valve and a third air valve, and the method comprises the following steps:

when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are smaller than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module and smaller than a CO2 value and a PM2.5 value preset in an air processing space, the first air valve is controlled to be opened;

when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are greater than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module, or the concentration of CO2 and the concentration of PM2.5 preset in the air processing space, the first air valve is controlled to be closed.

In some embodiments, the method further comprises:

the fan rotating speed signal based on the output port of the indoor unit adjusts the light brightness of the ultraviolet lamp, and the light tube based on the ultraviolet lamp irradiates the photocatalytic filter, so that the surface of the photocatalytic filter forms active hydroxyl with extremely strong oxidizing capability, bacteria and organic pollutants in air supply are decomposed and removed, and the ultraviolet lamp and the photocatalytic filter are both arranged at the output port of the indoor unit.

In some embodiments, the adjusting the brightness of the ultraviolet lamp based on the fan speed signal at the output port of the indoor unit specifically includes:

when the wind speed corresponding to the fan rotating speed signal is reduced, reducing the power of the ultraviolet lamp and reducing the brightness of the ultraviolet lamp;

and when the wind speed corresponding to the fan rotating speed signal is increased, increasing the power of the ultraviolet lamp and improving the brightness of the ultraviolet lamp.

In some embodiments, the method further comprises:

and when the air conditioning system enters the fresh air mode, opening the first air valve and the second air valve, and closing the third air valve.

Compared with the prior art, the method has the following beneficial effects:

the invention discloses an air conditioning system and an air purification control method for the air conditioning, wherein the air conditioning system comprises an air supply duct, a sterilization module, a return air duct, an air detection module, an air exhaust duct, a fresh air duct, an environment quality detection module, a first air valve, a second air valve and a third air valve, and the method comprises the following steps: when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are smaller than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module and are smaller than a CO2 value and a PM2.5 value preset in an air processing space, the first air valve is controlled to be opened; when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are greater than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module, or the concentration of CO2 and the concentration of PM2.5 preset in the air processing space, the first air valve is controlled to be closed. Therefore, the air conditioner can better purify indoor air while adjusting the room temperature, and the comfort level of a user is improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic flow chart of an air conditioning air purification control method according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an air conditioning system according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

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

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

To further describe aspects of the present application, in one example of the present application, the air conditioning system includes:

the air supply duct is communicated with the air outlet side of the indoor unit of the air conditioner and the air inlet side of the air processing space;

the sterilization module is arranged in the air supply duct;

the air return duct is communicated with the air outlet side of the air processing space and the air return side of the indoor unit of the air conditioner;

the air detection module is arranged in the return air duct;

the air exhaust duct is communicated with the return air duct;

the fresh air duct is communicated with the outdoor and the return air duct;

the environment quality detection module is arranged in the fresh air duct;

the first air valve is arranged in the fresh air duct and used for controlling the opening and closing of the fresh air duct;

the second air valve is arranged in the air exhaust air duct and used for controlling the opening and closing of the air exhaust air duct;

and the third air valve is arranged in the return air duct and is positioned between the air flow channels of the exhaust air duct and the fresh air duct.

In the embodiment of this application, to the indoor set of large capacity air conditioner, to extend the tuber pipe usually when using, supply air and share a tuber pipe return air to each room respectively through the tuber pipe, as shown in fig. 2, do air conditioning system's schematic structure diagram is provided with the new trend wind channel to tuber pipe new trend side, and the new trend wind channel communicates in outdoor and return air wind channel and installs first blast gate in the new trend wind channel, and the purpose of setting up first blast gate is opening or closing of control new trend wind channel, can introduce the indoor set with the new trend when the new trend wind channel is opened constantly, and the indoor set is not introduced to the new trend when closing, sets up the air quality information that environmental quality detection module is used for detecting the new trend in the new trend wind channel. The air return side of the air pipe is provided with an air return duct, the air return duct is communicated with the air outlet side of the air processing space and the air return side of an indoor unit of the air conditioner, a third air valve is installed in the air return duct, the position of the third air valve is between an air exhaust duct and an air flow channel of a fresh air duct, fresh air and the air return are not interfered with each other through the third air valve, the fresh air enters the indoor unit from the outside through the fresh air duct, the air return is discharged through the air exhaust duct, mixing of the fresh air and the air return can be avoided, an air detection module is arranged in the air return duct and used for detecting air quality information of the air return, humidity and temperature, the air quality information comprises CO2 concentration and PM2.5 concentration, and the detected temperature and humidity are used for adjusting the normal operation of the air conditioning system. The air exhaust side of the air pipe is provided with an air exhaust duct, the air exhaust duct is communicated with the air return duct and is internally provided with a second air valve, the second air valve controls the opening and closing of the air exhaust duct, the second air valve can ensure that the air return of each user room smoothly enters the air exhaust duct through the air return duct and can smoothly discharge the indoor air return through the air exhaust duct. An air supply duct is arranged on the air supply side of the air pipe, the air supply duct is communicated with the air outlet side of the indoor unit of the air conditioner and the air inlet side of the air treatment space, fresh air or return air can be sent into each room, and a sterilization module is arranged in the air supply duct and is used for killing bacteria and viruses in the air. The air conditioning system in this application through this kind of mode of setting, indoor air that can be better purifies.

In order to achieve the sterilization effect, in some embodiments, the sterilization module includes an ultraviolet lamp and the photocatalytic filter, the ultraviolet lamp is connected to the indoor unit fan of the air conditioner and can receive the rotation speed signal of the indoor unit of the air conditioner, and the brightness of the ultraviolet lamp is adjusted based on the rotation speed of the indoor unit fan of the air conditioner.

In this embodiment, the window needs to be closed when the air conditioner is opened, it can't introduce outdoor clean air to form airtight space like this, it changes the propagation that causes the virus to not ventilate for a long time, through set up ultraviolet lamp and photocatalytic filter in the air supply wind channel and come the bacterium in the bactericidal air, the virus, indoor set output port gives the fan rotational speed signal transmission of air conditioner indoor set to ultraviolet lamp, ultraviolet lamp opens and shines photocatalytic filter with different luminance according to the rotational speed of fan, consequently, photocatalytic filter's surface forms the active hydroxyl that the oxidability is extremely strong, this kind of active hydroxyl that the oxidability is extremely strong can decompose and drive away bacterium and organic pollutant in the air supply air, reach the effect of disinfecting, deodorization, air purification. The rotating speed of the fan of the indoor unit generally has HH/Hi/Me/Lo/Slo 5 gears, the power of the ultraviolet lamp is adjusted according to the rotating speed signal of the fan in the air channel to determine the size of the air speed so as to achieve the purpose of energy saving, and when the air speed corresponding to the rotating speed signal of the fan is reduced, the power of the ultraviolet lamp is reduced, and the brightness of the ultraviolet lamp is reduced; when the wind speed corresponding to the fan rotating speed signal is increased, the power of the ultraviolet lamp is increased, and the brightness of the ultraviolet lamp is improved. Therefore, the novel air purifier can introduce fresh air into the room and simultaneously has the functions of sterilization, disinfection and energy conservation.

For better purification of indoor air, in some embodiments, the air conditioning system further comprises:

and the filter screen is arranged in the return air duct and is positioned on the return air side branch flow passage of the indoor unit of the air conditioner, and the filter screen is communicated with the fresh air duct and is used for filtering PM2.5 and dust.

In the embodiment, the filter screen is arranged in the return air duct and is positioned on the branch flow passage of the return air side of the fresh air duct communicated with the indoor unit of the air conditioner, when the return air or the fresh air in a room is doped with PM2.5 and dust, the PM2.5 and the dust in the air can be effectively filtered through the filter screen, so that the indoor air can be further purified while bacteria can be killed,

in order to avoid the air duct from sucking return air from each room and then blowing the return air to each room, in some embodiments, the air conditioning system comprises a full air mode, and when the air conditioner enters the full air mode, the first air valve and the second air valve are opened, and the third air valve is closed.

In the embodiment, in order to avoid the air pipe from sucking return air from each room and then supplying air to each room and reduce the workload of the sterilization equipment, the air conditioning system is also provided with a fresh air mode, and the air inlet of the indoor unit in the fresh air mode needs to be completely dependent on the fresh air and continuously discharges the return air. The first air valve is used for continuously introducing fresh air into the indoor unit, and the second air valve is used for enabling return air of each user room to smoothly enter the air exhaust duct through the return air duct and enabling the return air to be smoothly exhausted through the air exhaust duct. When the air conditioner enters a full fresh air mode, the first air valve and the second air valve are opened for continuously introducing fresh air into the indoor unit and ensuring that return air is smoothly discharged from the indoor unit, and the third air valve is closed.

In order to further illustrate the technical idea of the present invention, the present invention further provides an air purification control method for an air conditioner, the method is applied to an air conditioning system including an air supply duct, a sterilization module, a return air duct, an air detection module, an air exhaust duct, a fresh air duct, an environmental quality detection module, a first air valve, a second air valve, and a third air valve, and as shown in fig. 1, the method specifically includes the following steps:

s101, when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are smaller than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module and are smaller than a CO2 value and a PM2.5 value preset in an air processing space, the first air valve is controlled to be opened.

In this step, to the indoor set of large capacity air conditioner, to extension tuber pipe usually when using, supply air and a tuber pipe return air of sharing respectively to each room through the tuber pipe, be provided with the new trend wind channel to tuber pipe new trend side, install first blast gate in the new trend wind channel, the purpose of setting up first blast gate is constantly introduced the indoor set with the new trend, sets up environmental quality detection module in the new trend wind channel and is used for detecting the air quality information of new trend. Be provided with the return air wind channel to tuber pipe return air side, install the third blast gate in the return air wind channel, the purpose that sets up the third blast gate is used for avoiding new trend and return air to mix, sets up the air detection module in the return air wind channel for detect the air quality information, humidity and the temperature of return air. An air exhaust duct is arranged on the air exhaust side of the air pipe, and a second air valve is arranged in the air exhaust duct and used for ensuring that return air is smoothly exhausted from the indoor to the outdoor. When the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are less than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module and are less than the preset value of CO2 and the preset value of PM2.5 in the air processing space, the first air valve is controlled to be opened, the situation that fresh air needs to be introduced due to poor indoor air quality is indicated at the moment, therefore, the first air valve is controlled to be opened at the speed of 5% of opening degree in each detection period, and then the fresh air is reasonably introduced. So as to achieve the purpose of purifying indoor air and keep the indoor clean.

It should be noted that the above solution of the preferred embodiment is only a specific implementation solution proposed in the present application, and other methods of opening the fresh air valve at different opening rates per detection period are all within the protection scope of the present application.

In order to achieve the effect of sterilization in the room while introducing fresh air, in a preferred embodiment of the present application, the method further comprises:

the fan rotating speed signal based on the output port of the indoor unit adjusts the light brightness of the ultraviolet lamp, and the light tube based on the ultraviolet lamp irradiates the photocatalytic filter, so that the surface of the photocatalytic filter forms active hydroxyl with extremely strong oxidizing capability, bacteria and organic pollutants in air supply are decomposed and removed, and the ultraviolet lamp and the photocatalytic filter are both arranged at the output port of the indoor unit.

In this embodiment, the window needs to be closed when the air conditioner is opened, it can't introduce outdoor clean air to form airtight space like this, it is difficult to ventilate for a long time and causes the propagation of virus, transmit the fan rotational speed signal of indoor set to ultraviolet lamp through the output port of indoor set, ultraviolet lamp opens and shines the photocatalysis filter with different luminance according to the rotational speed of fan, consequently, the surface of photocatalysis filter forms the active hydroxyl that the oxidizing power is extremely strong, this kind of active hydroxyl that the oxidizing power is extremely strong can decompose and drive away bacterium and organic pollutant in the air supply, reach the effect of disinfecting, deodorization, air purification. Therefore, the novel air purifier can introduce fresh air into the room and simultaneously has the functions of sterilization and disinfection, and the problem of insufficient room cleanliness is effectively solved.

In order to save energy for the air conditioner, in a preferred embodiment of the present application, the brightness of the ultraviolet lamp is adjusted based on a fan rotation speed signal at an output port of the indoor unit, specifically:

when the wind speed corresponding to the fan rotating speed signal is reduced, reducing the power of the ultraviolet lamp and reducing the brightness of the ultraviolet lamp;

and when the wind speed corresponding to the fan rotating speed signal is increased, increasing the power of the ultraviolet lamp and improving the brightness of the ultraviolet lamp.

In this embodiment, an output port of the indoor unit transmits a fan rotation speed signal of the indoor unit to the ultraviolet lamp, the rotation speed of the fan of the indoor unit generally has HH/Hi/Me/Lo/Slo 5 gears, the power of the ultraviolet lamp is adjusted according to the fan rotation speed signal in the air duct to determine the size of the air speed so as to achieve the purpose of energy saving, and when the air speed corresponding to the fan rotation speed signal is reduced, the power of the ultraviolet lamp is reduced, and the brightness of the ultraviolet lamp is reduced; when the wind speed corresponding to the fan rotating speed signal is increased, the power of the ultraviolet lamp is increased, and the brightness of the ultraviolet lamp is improved. When the wind speed is small, the power is low, the brightness is low, and when the wind speed is large, the power is high, the brightness is high, and the energy conservation of the air conditioner is facilitated.

S102, when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are greater than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module, or the concentration of CO2 and the concentration of PM2.5 preset in the air processing space, the first air valve is controlled to be closed.

In this step, when the environment quality detection module detects that the concentration of CO2 and the concentration of PM2.5 in the fresh air duct are greater than the concentration of CO2 and the concentration of PM2.5 in the return air duct detected by the air detection module, or the concentration of CO2 and the concentration of PM2.5 preset in the air processing space, the first air valve is controlled to be closed. At the moment, the indoor air quality is enough to ensure the safety and comfort of a user, and fresh air does not need to be introduced, so that the first air valve is controlled to be closed at the speed of 5% of opening per detection period, meanwhile, a filter screen is arranged on a return air duct for better purifying the indoor air, the filter screen is positioned on a return air side branch flow passage of an indoor unit of an air conditioner communicated with the fresh air duct, and PM2.5, dust and the like of the return air and the fresh air can be filtered.

In order to better purify indoor air, in a preferred embodiment of the present application, the method further comprises:

and when the air conditioning system enters the fresh air mode, opening the first air valve and the second air valve, and closing the third air valve.

In the embodiment, in order to avoid the air pipe from sucking return air from each room and then supplying air to each room and reduce the workload of the sterilization equipment, the air conditioning system is also provided with a fresh air mode, and the air inlet of the indoor unit in the fresh air mode needs to be completely dependent on the fresh air and continuously discharges the return air. When the air conditioner enters a full fresh air mode, the first air valve and the second air valve are opened for continuously introducing fresh air into the indoor unit and ensuring that return air is smoothly discharged to the outside from the inside, and the third air valve is closed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.