Air conditioner and control method thereof

Abstract

The invention provides an air conditioner and a control method thereof.The air conditioner comprises a fresh air device and an oxygen generation device, the fresh air device comprises a fresh air device body and a fresh air pipe connected to the fresh air device body, and the fresh air pipe is provided with an outdoor pipe section located outdoors; the oxygen generating device comprises an oxygen generating device body and an oxygen conveying pipe connected to the oxygen generating device body, and the oxygen conveying pipe is communicated with the outdoor pipe section. According to the air conditioner, due to the fact that the oxygen conveying pipe of the oxygen generating device is directly communicated with the outdoor pipe section of the fresh air pipe of the fresh air device outdoors, the oxygen generating device can convey oxygen into the room through the fresh air pipe, and equivalently, only one fresh air pipe is connected between the indoor unit and the outdoor unit of the air conditioner with the fresh air device and the oxygen generating device; the indoor unit does not need to reserve an installation space for the oxygen conveying pipe, and therefore the size of the indoor unit can be reduced. Meanwhile, compared with the mode that the fresh air pipe and the oxygen production pipe penetrate through the wall at the same time, the occupied space is smaller when a single pipe penetrates through the wall, and installation, cleaning and maintenance are easier and more convenient.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an air conditioner and a control method thereof. Background Art

[0002] After an air conditioner without a fresh air system has been running for a period of time, the quality of the indoor air and the oxygen content become low due to the lack of exchange with the outdoor air. Users who stay in this environment for a long time are prone to adverse phenomena such as dizziness, which makes the actual experience worse.

[0003] Air conditioners equipped with fresh air systems can alleviate the problem of deteriorating indoor air quality to a certain extent. However, if the air conditioner is placed in a harsh environment and cannot meet the requirements for the oxygen-nitrogen balance of the indoor air, an oxygen production module can be added to supplement the indoor air with oxygen.

[0004] At present, the fresh air device and oxygen generator of the existing air conditioner are installed independently and placed separately in the indoor unit and outdoor unit. Among them, the oxygen generator sends oxygen into the indoor unit of the air conditioner through the oxygen supply pipe through the wall, and then releases it into the room; the fresh air device communicates with the outdoor air through a separate fresh air pipe through the wall to complete the exchange or renewal of indoor and outdoor air. Since the two devices are placed independently, there will be two air supply pipes connecting the indoor unit and the outdoor unit, which is not conducive to improving the utilization rate of space and the volume control of the indoor unit. Summary of the invention

[0005] Therefore, the present invention provides an air conditioner that can solve the technical problem that there are two air supply pipes connected between the indoor unit and the outdoor unit of the air conditioner with a fresh air device and an oxygen generator, which is not conducive to improving the utilization of space and the volume control of the indoor unit.

[0006] In order to solve the above problems, the present invention provides an air conditioner, comprising: an indoor unit and an outdoor unit, the indoor unit is equipped with a fresh air device, the fresh air device comprises a fresh air device body and a fresh air duct connected to the fresh air device body, the fresh air duct has an outdoor pipe section located outdoors, the outdoor unit is equipped with an oxygen generator, the oxygen generator comprises an oxygen generator body and an oxygen supply pipe connected to the oxygen generator body, and the oxygen supply pipe is connected to the outdoor pipe section.

[0007] The present invention also provides a control method for controlling the operation of the aforementioned air conditioner, the control method comprising: when a set condition is reached, the oxygen supply pipe delivers outdoor fresh air and / or the produced oxygen to the indoor unit.

[0008] In some embodiments, the set condition includes: the indoor oxygen concentration is less than a first set oxygen concentration, or the operating time of the air conditioner is greater than a set time.

[0009] In some embodiments, when the PM10 of the outdoor air is less than or equal to a first set value and the oxygen concentration of the outdoor air is greater than or equal to the first oxygen set concentration, the fresh air device is controlled to operate; when the PM2.5 of the outdoor air is less than or equal to a second set value and the oxygen concentration of the outdoor air is greater than or equal to the first oxygen set concentration, the fresh air device is controlled to operate.

[0010] In some embodiments, when the PM10 of the outdoor air is greater than a first set value, the oxygen generator is controlled to operate; when the PM2.5 of the outdoor air is greater than a second set value, the oxygen generator is controlled to operate; when the carbon dioxide concentration of the outdoor air is greater than the set carbon dioxide concentration, the oxygen generator is controlled to operate.

[0011] In some embodiments, when the PM10 of the outdoor air is less than or equal to a first set value, and the oxygen concentration of the outdoor air is less than the first oxygen set concentration, the fresh air device and the oxygen production device are controlled to operate simultaneously; when the PM2.5 of the outdoor air is less than or equal to a second set value, and the oxygen concentration of the outdoor air is less than the first oxygen set concentration, the fresh air device and the oxygen production device are controlled to operate simultaneously.

[0012] In some embodiments, the oxygen concentration of the air in the fresh air duct is obtained, and the operating power of the fresh air device and the oxygen production device is adjusted according to the oxygen concentration of the air in the fresh air duct.

[0013] In some embodiments, when the oxygen concentration of the air in the fresh air duct is less than the first set oxygen concentration, the operating power of the fresh air device is controlled to decrease, and the operating power of the oxygen production device is controlled to increase.

[0014] In some embodiments, when the oxygen concentration of the air in the fresh air duct is greater than or equal to a first set oxygen concentration and less than or equal to a second set oxygen concentration, the operating powers of the fresh air device and the oxygen production device are controlled to remain unchanged.

[0015] In some embodiments, when the oxygen concentration of the air in the fresh air duct is greater than the second set oxygen concentration, the operating power of the fresh air device is controlled to increase, and the operating power of the oxygen production device is controlled to decrease.

[0016] The present invention provides an air conditioner and a control method thereof, which have the following beneficial effects:

[0017] Since the oxygen supply pipe of the oxygen generator is directly connected to the outdoor pipe section of the fresh air pipe of the fresh air device outdoors, the oxygen generator can use the fresh air pipe to transport oxygen to the room. This is equivalent to only one fresh air pipe connecting the indoor unit and the outdoor unit of the air conditioner with the fresh air device and the oxygen generator. In this case, the indoor unit does not need to reserve installation space for the oxygen supply pipe, thereby reducing the size of the indoor unit. At the same time, compared with the two pipes of fresh air and oxygen generator passing through the wall at the same time, the single fresh air pipe passing through the wall occupies less space, and is easier and more convenient to install, clean and maintain. Furthermore, because the oxygen generator can use the fresh air pipe to transport oxygen to the room, when the oxygen generator and the fresh air device are running at the same time, the two air flows that originally supply oxygen to the indoor unit and introduce fresh air are combined into one, which can also reduce air flow turbulence and reduce pneumatic noise during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0019] Figure 1 A schematic diagram of the oxygen supply pipe of the oxygen production device of the air conditioner according to an embodiment of the present invention being connected to the outdoor pipe section of the fresh air pipe of the fresh air device;

[0020] Figure 2 is a control logic diagram of an air conditioner according to an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of separately installing an oxygen supply pipe of an oxygen production device and a fresh air pipe of a fresh air device of an air conditioner in the prior art.

[0022] The reference numerals are:

[0023] 1. Fresh air device main body; 2. Fresh air duct; 3. Oxygen supply pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0026] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0028] See also Figures 1 to 3 As shown, according to an embodiment of the present invention, an air conditioner is provided, comprising: an indoor unit and an outdoor unit, the indoor unit is equipped with a fresh air device, the fresh air device comprises a fresh air device body 1 and a fresh air pipe 2 connected to the fresh air device body 1, the fresh air pipe 2 has an outdoor pipe section located outdoors, and the outdoor unit is equipped with an oxygen generator, the oxygen generator comprises an oxygen generator body and an oxygen supply pipe 3 connected to the oxygen generator body, and the oxygen supply pipe 3 is connected to the outdoor pipe section.

[0029] In this technical solution, since the oxygen supply pipe 3 of the oxygen generator is directly connected to the outdoor pipe section of the fresh air pipe 2 of the fresh air device outdoors, the oxygen generator can use the fresh air pipe 2 to transport oxygen to the room, which is equivalent to only one fresh air pipe 2 connecting the indoor unit and the outdoor unit of the air conditioner with the fresh air device and the oxygen generator. The indoor unit does not need to reserve installation space for the oxygen supply pipe 3, thereby reducing the size of the indoor unit. At the same time, compared with the two pipes of fresh air and oxygen generator passing through the wall at the same time, the single fresh air pipe 2 passing through the wall occupies less space, and is easier and more convenient to install, clean and maintain. Furthermore, because the oxygen generator can use the fresh air pipe 2 to transport oxygen to the room, when the oxygen generator and the fresh air device are running at the same time, the two air flows that originally supply oxygen to the indoor unit and introduce fresh air are combined into one, which can also reduce air flow turbulence and reduce pneumatic noise during operation.

[0030] As a specific implementation, the fresh air pipe 2 includes a first pipe section, a three-way joint and a second pipe section, the three-way joint has a first interface, a second interface and a third interface, one end of the first pipe section is connected to the fresh air device body 1, the end of the first pipe section away from the fresh air device body 1 is connected to the first interface, the second pipe section is connected to the second interface, the end of the oxygen supply pipe 3 away from the oxygen production device body is connected to the third interface, and the three-way joint and the second pipe section are combined to form an outdoor pipe section. Among them, the three-way joint can realize the quick and convenient connection of the oxygen supply pipe 3 with the outdoor pipe section of the fresh air pipe 2.

[0031] The present invention also provides a control method for controlling the operation of the aforementioned air conditioner, the control method comprising: when the set condition is reached, the oxygen delivery pipe 3 delivers one or two air flows to the indoor unit. It is understandable that after the oxygen production device can deliver oxygen to the room with the help of the fresh air pipe 2, the room will introduce outdoor fresh air and / or produced oxygen according to demand, so that the oxygen delivery pipe 3 will deliver one or two air flows to the indoor unit.

[0032] See also Figure 2 As shown, the set conditions include: the indoor oxygen concentration is less than the first set oxygen concentration, or the operating time of the air conditioner is greater than the set time.

[0033] In this embodiment, the first oxygen setting concentration is 20.45%. When the indoor oxygen concentration is less than the first oxygen setting concentration, it indicates that the indoor air quality has deteriorated and the oxygen concentration is low, so it is necessary to control the operation of the fresh air device and / or the oxygen generator to supplement the indoor oxygen. The setting time is two hours. When the air conditioner runs for more than two hours, even if the indoor air carbon dioxide content does not exceed the standard, the fresh air device and / or the oxygen generator should be controlled to operate to renew the indoor air, thereby effectively reducing the indoor carbon dioxide content, which is beneficial to maintaining the freshness of the indoor air, ensuring human health and improving the actual experience of users.

[0034] As a specific implementation, when the PM10 of the outdoor air is less than or equal to the first set value and the oxygen concentration of the outdoor air is greater than or equal to the first oxygen set concentration, the fresh air device is controlled to operate, and the oxygen supply pipe 3 delivers an airflow, namely, outdoor fresh air, to the indoor unit.

[0035] In this technical solution, the first setting value is 150 μg / m 3 When the PM10 of outdoor air is less than or equal to the first set value, it indicates that the outdoor air quality is good; when the oxygen concentration of outdoor air is greater than or equal to the first oxygen set concentration of 20.45%, it indicates that the oxygen content of outdoor air is normal. In this way, it is only necessary to control the operation of the fresh air device to introduce outdoor fresh air into the room to update the indoor air and increase the oxygen content of the indoor air.

[0036] Further, when the PM2.5 of the outdoor air is less than or equal to the second set value and the oxygen concentration of the outdoor air is greater than or equal to the first oxygen set concentration, the fresh air device is controlled to operate, and the oxygen supply pipe 3 delivers an airflow, namely, outdoor fresh air, to the indoor unit.

[0037] In this embodiment, the second set value is 75 μg / m 3 When the PM2.5 of outdoor air is less than or equal to the second set value, it indicates that the outdoor air quality is good; when the oxygen concentration of outdoor air is greater than or equal to the first oxygen set concentration of 20.45%, it indicates that the oxygen content of outdoor air is normal. In this way, it is only necessary to control the operation of the fresh air device to introduce outdoor fresh air into the room to update the indoor air and increase the oxygen content of the indoor air.

[0038] It is understandable that when the PM10 in outdoor air is less than or equal to 150 μg / m 3 Or the PM2.5 of outdoor air is less than or equal to 75μg / m 3 When the oxygen content of outdoor air is normal, only the fresh air device is controlled to operate to update the indoor air and increase the oxygen content of indoor air. Furthermore, since the oxygen generator is in a closed state when the fresh air device is in operation, when outdoor fresh air is introduced, the airflow can be prevented from entering the oxygen generator, thereby avoiding affecting the airflow and ventilation effect.

[0039] As a specific implementation, when the PM10 of the outdoor air is greater than the first set value, the oxygen production device is controlled to operate, and the oxygen supply pipe 3 delivers a stream of air, namely the produced oxygen, to the indoor unit.

[0040] In this technical solution, when the PM10 of outdoor air is greater than the first set value of 150 μg / m 3When the outdoor air quality is poor, it indicates that the indoor air quality cannot be renewed and the indoor air oxygen content cannot be increased by introducing outdoor fresh air. The indoor air oxygen content can only be increased by controlling the operation of the oxygen generator and transporting the oxygen produced by the oxygen generator into the room.

[0041] Furthermore, when the PM2.5 of the outdoor air is greater than the second set value, the oxygen production device is controlled to operate, and the oxygen supply pipe 3 delivers a stream of air, namely the produced oxygen, to the indoor unit.

[0042] In this embodiment, when the PM2.5 of the outdoor air is greater than the second set value of 75 μg / m 3 When the outdoor air quality is poor, it indicates that the indoor air quality cannot be renewed and the indoor air oxygen content cannot be increased by introducing outdoor fresh air. The indoor air oxygen content can only be increased by controlling the operation of the oxygen generator and transporting the oxygen produced by the oxygen generator into the room.

[0043] Furthermore, when the carbon dioxide concentration of the outdoor air is greater than the set carbon dioxide concentration, the oxygen generator is controlled to operate, and the oxygen delivery pipe 3 delivers a stream of air, namely the produced oxygen, to the indoor unit.

[0044] In this technical solution, the set concentration of carbon dioxide is 1000ppm. When the carbon dioxide concentration of outdoor air is greater than the set concentration of carbon dioxide, it indicates that the outdoor air quality is poor. Therefore, it is not possible to update the indoor air and increase the oxygen content of the indoor air by introducing fresh outdoor air. The oxygen content of the indoor air can only be increased by controlling the operation of the oxygen generator and transporting the oxygen produced by the oxygen generator into the room.

[0045] It is understandable that when the PM10 in outdoor air is greater than 150 μg / m 3 、PM2.5 in outdoor air is greater than 75μg / m 3 Or when the set concentration of carbon dioxide in the outdoor air is greater than 1000ppm, it indicates that the outdoor air quality is poor, and the oxygen content in the indoor air can only be increased by controlling the operation of the oxygen generator. Furthermore, since the air inlet of the fresh air duct 2 is closed when the oxygen generator is running, the fresh air duct 2 only contains the high-concentration oxygen produced by the oxygen generator without outdoor fresh air. This can prevent the outdoor air from reducing the oxygen concentration and the fresh air duct 2 from generating vibration noise due to excessive flow rate. Finally, high-concentration oxygen enters the room through the fresh air duct 2 and the main body 1 of the fresh air device in turn. In order to speed up the entry of oxygen into the room, the centrifugal fan in the main body 1 of the fresh air device can also be started at a low speed to assist the flow. This can speed up the entry of oxygen into the room without causing vibration noise in the fresh air duct 2 due to excessive flow rate.

[0046] As a specific implementation method, when the PM10 of the outdoor air is less than or equal to the first set value, and the oxygen concentration of the outdoor air is less than the first oxygen set concentration, the fresh air device and the oxygen production device are controlled to operate simultaneously, and the oxygen supply pipe 3 delivers two airflows to the indoor unit, namely, the outdoor fresh air and the produced oxygen.

[0047] In this embodiment, when the PM10 of the outdoor air is less than or equal to the first set value of 150 μg / m 3 , and when the oxygen concentration of the outdoor air is less than the first oxygen setting concentration of 20.45%, it indicates that the outdoor air quality is good, but the oxygen content is insufficient. Therefore, it is necessary to control the fresh air device and the oxygen generator to operate at the same time, use the fresh air device to introduce outdoor fresh air into the room to update the indoor air, and use the oxygen generator to transport oxygen into the room to increase the oxygen content of the indoor air.

[0048] Furthermore, when the PM2.5 of the outdoor air is less than or equal to the second set value, and the oxygen concentration of the outdoor air is less than the first oxygen set concentration, the fresh air device and the oxygen production device are controlled to operate simultaneously, and the oxygen supply pipe 3 delivers two airflows to the indoor unit, namely, the outdoor fresh air and the produced oxygen.

[0049] In this technical solution, when the PM2.5 of outdoor air is less than or equal to the second set value of 75μg / m 3 , and when the oxygen concentration of the outdoor air is less than the first oxygen setting concentration of 20.45%, it indicates that the outdoor air quality is good, but the oxygen content is insufficient. Therefore, it is necessary to control the fresh air device and the oxygen generator to operate at the same time, use the fresh air device to introduce outdoor fresh air into the room to update the indoor air, and use the oxygen generator to transport oxygen into the room to increase the oxygen content of the indoor air.

[0050] It should be noted that the outdoor unit is equipped with a gas sensor and a particle sensor. The gas sensor is used to monitor the oxygen concentration and carbon dioxide concentration of the outdoor air in real time, and the particle sensor is used to monitor the PM10 and PM2.5 values ​​of the outdoor air in real time. The indoor unit is equipped with an oxygen concentration monitor, which is used to monitor the oxygen concentration of the indoor air in real time. When the oxygen concentration of the indoor air is less than the first oxygen setting concentration and the fresh air device and / or the oxygen generator are controlled to operate, if it is detected that the oxygen content of the indoor air has returned to normal, that is, when the oxygen concentration has returned to 20.95%±0.5%, the fresh air device and the oxygen generator are controlled to stop operating. When the running time of the air conditioner is greater than the set time and the fresh air device and / or the oxygen generator are controlled to operate, the fresh air device and / or the oxygen generator are controlled to stop operating after a short ventilation is completed after running for 10-15 minutes. After manually controlling the operation of the fresh air device and / or the oxygen generator, the user can control the running time of the air device and / or the oxygen generator according to his or her actual feelings.

[0051] Furthermore, the oxygen concentration of the air in the fresh air duct 2 is obtained, and the operating power of the fresh air device and the oxygen production device is adjusted according to the oxygen concentration of the air in the fresh air duct 2.

[0052] In this embodiment, an oxygen concentration monitor is also installed in the fresh air duct 2. The oxygen concentration monitor is used to monitor the oxygen concentration of the air in the fresh air duct 2 in real time, so as to adjust the operating power of the fresh air device and the oxygen production device in real time according to the detected oxygen concentration to ensure that the oxygen concentration is within a safe range, while avoiding the fresh air device and the oxygen production device from maintaining high-power operation at the same time, causing the gas flow rate in the fresh air duct 2 to be too fast, resulting in excessive pressure and excessive noise.

[0053] As a specific implementation, when the oxygen concentration of the air in the fresh air duct 2 is less than the first oxygen setting concentration, the operating power of the fresh air device is controlled to decrease, and the operating power of the oxygen generator is controlled to increase, so that the oxygen concentration of the air in the fresh air duct 2 increases to ensure that the oxygen concentration increases to a safe range. When the oxygen concentration of the air in the fresh air duct 2 is greater than or equal to the first oxygen setting concentration and less than or equal to the second oxygen setting concentration, the operating power of the fresh air device and the operating power of the oxygen generator are controlled to remain unchanged, because the oxygen concentration is within the safe range at this time and no adjustment is required. When the oxygen concentration of the air in the fresh air duct 2 is greater than the second oxygen setting concentration, the operating power of the fresh air device is controlled to increase, and the operating power of the oxygen generator is controlled to decrease, because the oxygen concentration is too high at this time and needs to be adjusted downward. It can be understood that for the human body, the normal oxygen concentration is 20.95% ± 0.5%, so the second oxygen setting concentration is 20.95% + 0.5%.

[0054] Figure 2 The control logic diagram of the air conditioner according to the embodiment of the present invention is shown in FIG. Figure 2 In the embodiment, the fresh air module is the fresh air device, and the oxygen production module is the oxygen production device. It is understandable that, in addition to the automatic control of the air conditioner, the user can also manually control the desired operation mode of the air conditioner according to his actual feeling when the fresh air device and / or the oxygen production device are running.

[0055] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0056] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air conditioner, characterized in that: include: An indoor unit and an outdoor unit, wherein the indoor unit is equipped with a fresh air device, wherein the fresh air device comprises a fresh air device body (1) and a fresh air pipe (2) connected to the fresh air device body (1), wherein the fresh air pipe (2) has an outdoor pipe section located outdoors, and wherein the outdoor unit is equipped with an oxygen generator, wherein the oxygen generator comprises an oxygen generator body and an oxygen supply pipe (3) connected to the oxygen generator body, wherein the oxygen supply pipe (3) is connected to the outdoor pipe section.

2. A method for controlling an air conditioner, characterized in that: Used to control the operation of the air conditioner according to claim 1, the control method comprises: when the set conditions are met, the oxygen supply pipe (3) supplies outdoor fresh air and / or produced oxygen to the indoor unit.

3. The control method according to claim 2, characterized in that: The set conditions include: the indoor oxygen concentration is less than a first set oxygen concentration, or the operating time of the air conditioner is greater than a set time.

4. The control method according to claim 2, characterized in that: When the PM10 of the outdoor air is less than or equal to the first set value, and the oxygen concentration of the outdoor air is greater than or equal to the first set oxygen concentration, controlling the fresh air device to operate; When the PM2.5 of the outdoor air is less than or equal to the second set value, and the oxygen concentration of the outdoor air is greater than or equal to the first oxygen set concentration, the fresh air device is controlled to operate.

5. The control method according to claim 2, characterized in that: When the PM10 of the outdoor air is greater than a first set value, controlling the oxygen production device to operate; When the PM2.5 of the outdoor air is greater than a second set value, controlling the oxygen production device to operate; When the carbon dioxide concentration of the outdoor air is greater than the set carbon dioxide concentration, the oxygen production device is controlled to operate.

6. The control method according to claim 2, characterized in that: When the PM10 of the outdoor air is less than or equal to the first set value, and the oxygen concentration of the outdoor air is less than the first set oxygen concentration, controlling the fresh air device and the oxygen generator to operate simultaneously; When the PM2.5 of the outdoor air is less than or equal to the second set value, and the oxygen concentration of the outdoor air is less than the first set oxygen concentration, the fresh air device and the oxygen production device are controlled to operate simultaneously.

7. The control method according to claim 6, characterized in that: The oxygen concentration of the air in the fresh air duct (2) is obtained, and the operating power of the fresh air device and the oxygen production device is adjusted according to the oxygen concentration of the air in the fresh air duct (2).

8. The control method according to claim 7, characterized in that: When the oxygen concentration of the air in the fresh air duct (2) is less than the first set oxygen concentration, the operating power of the fresh air device is controlled to decrease, and the operating power of the oxygen production device is controlled to increase.

9. The control method according to claim 7, characterized in that: When the oxygen concentration of the air in the fresh air duct (2) is greater than or equal to the first set oxygen concentration and less than or equal to the second set oxygen concentration, the operating power of the fresh air device and the operating power of the oxygen production device are controlled to remain unchanged.

10. The control method according to claim 7, characterized in that: When the oxygen concentration of the air in the fresh air duct (2) is greater than the second set oxygen concentration, the operating power of the fresh air device is controlled to increase, and the operating power of the oxygen production device is controlled to decrease.

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