Pressurized building air purification mechanism and system for pressurized building air internal circulation

Abstract

The utility model provides a pressurized building air purification mechanism and a pressurized building air internal circulation system. The pressurized building air purification mechanism comprises a purification shell, a filter screen, a plurality of annular partition plates and an ultraviolet sterilization lamp. An air inlet is formed in one end of the purification shell, and an air outlet is formed in the other end of the purification shell; the filter screen and the annular partition plates are sequentially installed on the inner circumferential wall of the purification shell at intervals in the height direction of the purification shell, the filter screen is adjacent to the air inlet, and photocatalyst layers are arranged on the annular partition plates; the ultraviolet germicidal lamps sequentially penetrate through the annular partition plates, gaps are formed between the ultraviolet germicidal lamps and the annular partition plates, and the ultraviolet germicidal lamps are used for exciting the photocatalyst layers on the annular partition plates. The system can sterilize, filter and purify air in the pressurized building, after the pressurized equipment stops running, the effect equivalent to continuous air supply of the pressurized equipment can be achieved by starting the system, and the indoor air quality of the pressurized building can be greatly improved.

Description

Technical Field

[0001] This application relates to the field of pressurized buildings, and particularly to an air purification mechanism for pressurized buildings and a system for internal air circulation in pressurized buildings. Background Art

[0002] The airtightness of pressurized buildings is much higher than that of conventional buildings, and it cannot meet the fresh air requirements through the infiltration air of the envelope structure. In a pressurized building, fresh air is provided by a pressurization system. When the pressurization system operates, fresh air is delivered into the room while increasing the indoor building pressure, that is, building pressurization and fresh air delivery occur simultaneously. The air pressure in a pressurized building is much greater than the outdoor air pressure, and the fresh air delivered into the building through the pressurization system also involves a change in air state - increasing the air pressure, resulting in a significant increase in system energy consumption. Under the condition of the same air volume, the energy consumption of fresh air delivered by the pressurization system in a pressurized building is more than ten times that of the fresh air system used in a conventional building. And the pressurization system usually operates for 2 - 8 hours every day, and its operating time will vary according to different user functions. Therefore, from the perspective of energy conservation, it is necessary to reduce the operating time of the pressurization system.

[0003] Due to the airtightness of pressurized buildings, after the pressurization system stops operating, the indoor air can hardly exchange with the outside world. Pollutants emitted by indoor decoration materials, bacteria - carrying aerosols and odor - carrying gases exhaled by human respiration gradually accumulate during the process of the pressurization equipment stopping operation. Moreover, after the pressurization equipment stops operating, the indoor air is relatively static, and various pollutants are difficult to be evenly distributed in the building space, and local accumulation is likely to occur, such as a high concentration of bacteria - carrying aerosols in the human activity area; and the increase and local accumulation of harmful substances pose a potential hazard to people staying in the pressurized building for a long time. Summary of the Utility Model

[0004] One of the purposes of this application is to provide an air purification mechanism for pressurized buildings and a system for internal air circulation in pressurized buildings, aiming to solve the problem of poor indoor air quality in existing pressurized buildings.

[0005] The technical solution of this application is as follows:

[0006] An air purification mechanism for a pressurized building includes a purification housing, a filter screen, multiple annular partitions, and an ultraviolet germicidal lamp; an air inlet is provided at one end of the purification housing, and an air outlet is provided at the other end; the filter screen and the multiple annular partitions are sequentially and spacedly installed on the inner peripheral wall of the purification housing along the height direction of the purification housing, and the filter screen is adjacent to the air inlet, and the annular partitions are provided with a photocatalyst layer; the ultraviolet germicidal lamp sequentially passes through the multiple annular partitions and has a gap with the annular partitions, and the ultraviolet germicidal lamp is used to excite the photocatalyst layer on the annular partitions.

[0007] As a technical solution of the present application, a nano - silver layer is coated on the surface of the filter screen.

[0008] As a technical solution of the present application, a support plate is installed on the inner peripheral wall of the purification housing. The support plate is located between the bottom of the filter screen and the ultraviolet germicidal lamp. A plurality of ventilation holes with a size of 2 - 10 mm are formed in the support plate, and the total flow - through area of the ventilation holes is 50 - 80% of the total area of the support plate.

[0009] As a technical solution of the present application, the gap between the annular partition plate and the ultraviolet germicidal lamp is 1 - 3 mm.

[0010] As a technical solution of the present application, a plurality of air flow - through holes are formed in the annular partition plate, and the effective flow - through area of the air flow - through holes is 20% - 60% of the total area of the annular partition plate.

[0011] As a technical solution of the present application, the number of the annular partition plates is 5 - 25, and the distance between two adjacent annular partition plates is 5 - 50 mm.

[0012] As a technical solution of the present application, the ultraviolet germicidal lamp includes a lamp tube, a lamp head and a cable; the lamp head is arranged at the bottom of the lowermost annular partition plate and faces the air inlet; the cable is connected to the lamp head; the lamp tube is installed on the lamp head and sequentially passes through a plurality of annular partition plates, and the lamp tube is an ozone - free ultraviolet germicidal lamp tube.

[0013] A system for boosting the internal circulation of building air includes an air return port, an air return pipeline, a fan, a first check valve, a air supply pipeline and the above - mentioned boosting building air purification mechanism; the air return port, the boosting building air purification mechanism, the fan and the first check valve are sequentially arranged at intervals on the air return pipeline, and the air return port is located at the bottom end of the air return pipeline; the top end of the air return pipeline is connected to the air supply pipeline, and the fan transports the circulating air introduced from the air return port and purified by the boosting building air purification mechanism to the air supply port at the end of the air supply pipeline.

[0014] As a technical solution of the present application, it further includes a controller, a pressurizing device, an air outlet, an exhaust air pipeline and a second check valve; the pressurizing device and the second check valve are sequentially installed on the air supply pipeline, and the return air pipeline is between the second check valve and the air supply outlet; the air outlet is arranged on the exhaust air pipeline and below the air return outlet, and the distance between the air outlet and the air return outlet is less than 1 m; the air volume of the fan is 0.8 to 1.2 times that of the pressurizing device; the controller is electrically connected to the pressurizing device, the fan and the ultraviolet germicidal lamp in the pressurized building air purification mechanism respectively, and is used to control the opening or closing of the pressurizing device, the fan and the ultraviolet germicidal lamp.

[0015] Advantages of the present application:

[0016] In the pressurized building air purification mechanism and the pressurized building air internal circulation system of the present application, it has a pressurized building air purification mechanism with a strong effect of removing indoor air pollutants, and a pressurized building air internal circulation system is constructed relying on this pressurized building air purification mechanism. Therefore, when the circulating air passes through the present pressurized building air internal circulation system, the air therein can be effectively filtered and purified, so that the air quality therein is greatly improved. At the same time, its filter screen has dual functions of filtering and sterilizing, and it can filter and sterilize the air in the pressurized building; moreover, the annular partition is used for air flow, and the photocatalyst layer on its surface can be excited by the ultraviolet germicidal lamp to generate a strong oxidation effect, thereby killing bacteria and decomposing harmful substances in the air; in addition, the ultraviolet rays generated by the ultraviolet germicidal lamp have a disinfection and sterilization effect, and the ultraviolet rays have a short wavelength and high intensity, and the photocatalyst layer excited is better; at the same time, the photocatalyst layer is coated on the surfaces of multiple annular partitions, which effectively increases the area of the photocatalyst layer and also increases the contact area between the circulating air and the photocatalyst layer, thereby making the bactericidal and pest control effects of the photocatalyst layer better. Therefore, the circulating air undergoes a filtering effect after passing through the pressurized building air purification mechanism, and harmful substances such as bacteria are killed under the action of silver ions, ultraviolet rays and the photocatalyst layer, and gases such as formaldehyde in the air are also oxidized and decomposed by the photocatalyst layer, thereby making the circulating air obtain a filtering and purification effect. Description of the drawings

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0018] Figure 1Schematic diagram of the pressurized building air purification mechanism provided by the embodiments of the present application;

[0019] Figure 2 Schematic diagram of the A-A cross-section provided by the embodiments of the present application;

[0020] Figure 3 Schematic diagram of the system for the pressurized building air internal circulation provided by the embodiments of the present application.

[0021] Icon: 1 - purification housing; 2 - filter screen; 3 - annular partition; 4 - air inlet; 5 - air outlet; 6 - support plate; 7 - gap; 8 - air flow holes; 9 - lamp tube; 10 - lamp holder; 11 - cable; 12 - air return opening; 13 - air return pipeline; 14 - fan; 15 - first check valve; 16 - air supply pipeline; 17 - controller; 18 - pressurization device; 19 - exhaust opening; 20 - exhaust pipeline; 21 - second check valve; 22 - air supply opening. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0024] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present application, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0026] In addition, in this application, unless otherwise clearly specified and defined, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being above, on top of, and over the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0027] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging vertically, but may be slightly inclined. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly inclined.

[0028] In the description of this application, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged", "connected", and "joined" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Embodiment:

[0030] Please refer to Figure 1 and, in conjunction with Figures 2 to 3 , this application provides a pressurized building air purification mechanism, which mainly includes a purification housing 1, a filter net 2, a support plate 6, multiple annular partitions 3, and an ultraviolet germicidal lamp; wherein, an air inlet 4 is arranged at the bottom end of the purification housing 1, and an air outlet 5 is arranged at the top end; meanwhile, the filter net 2, the support plate 6, and multiple annular partitions 3 are sequentially and spacedly installed on the inner peripheral wall of the purification housing 1 along the height direction of the purification housing 1, and the filter net 2 is adjacent to the air inlet 4, and the annular partition 3 has a photocatalyst layer; the ultraviolet germicidal lamp sequentially passes through multiple annular partitions 3 and has a gap 7 with the annular partitions 3, and the ultraviolet germicidal lamp is used to activate the photocatalyst layer on the annular partition 3.

[0031] It should be noted that in this embodiment, the purification housing 1 is an opaque housing, and there will be no light overflow during its use. The filter screen 2 is a commercially available filter screen with a filtration grade of F9-H14. Before use, the filter screen 2 is completely immersed in a nano-silver solution with a concentration of 1000-4000 ppm and then dried, so that a nano-silver layer is coated on its surface, thus having the dual functions of filtration and sterilization. It can filter and sterilize the air in the pressurized building. And, the support plate 6 is located between the bottom of the filter screen 2 and the ultraviolet germicidal lamp, and the support plate 6 is provided with a plurality of ventilation holes with a size of 2-10 mm, and the total flow-through area of the ventilation holes is 50-80% of the total area of the support plate 6.

[0032] At the same time, the gap 7 between the annular partition 3 and the ultraviolet germicidal lamp is 1-3 mm. In addition, the annular partition 3 is provided with a plurality of air flow-through holes 8, and the effective flow-through area of the air flow-through holes 8 is 20%-60% of the total area of the annular partition 3.

[0033] It should be noted that before installation, the annular partition 3 is completely immersed in a commercially available photocatalyst layer solution with a concentration of 0.6-0.9% and then dried, so that a photocatalyst layer is coated on its surface. And, the number of the annular partitions 3 is 5-25, and the distance between two adjacent annular partitions 3 is 5-50 mm.

[0034] At the same time, the ultraviolet germicidal lamp includes a lamp tube 9, a lamp head 10 and a cable 11; the lamp head 10 is installed at the bottom of the lowermost annular partition 3 and faces the air inlet 4; the cable 11 is connected to the lamp head 10; the lamp tube 9 is installed on the lamp head 10 and sequentially passes through a plurality of annular partitions 3, and the lamp tube 9 is a commercially available ozone-free ultraviolet germicidal lamp tube 9; since ultraviolet rays have a disinfection and sterilization effect and the ultraviolet wavelength is short, thus it has an excitation effect on the photocatalyst layer on the surface of the annular partition 3, and because the ultraviolet rays emitted by the lamp tube 9 have a short wavelength and high intensity, therefore, the photocatalyst layer excited by it has a better effect, and the strong oxidation effect of the photocatalyst layer can kill bacteria and decompose harmful substances in the air, such as formaldehyde, etc. The annular partition 3 increases the area of the photocatalyst layer and also increases the contact area between the circulating air and the photocatalyst layer, thus making the bactericidal and pest control effects of the photocatalyst layer better. The circulating air undergoes a filtration effect through this pressurized building air purification mechanism, and harmful substances such as bacteria are killed under the action of silver ions, ultraviolet rays and the photocatalyst layer, and gases such as formaldehyde in the air are also oxidized and decomposed by the photocatalyst layer, and the circulating air is filtered and purified.

[0035] Therefore, this mechanism combines three disinfection measures and enhances the disinfection efficacy through structural design, as follows: (1) The silver ion-coated filter screen 2, where silver ions have bactericidal effects; (2) The ultraviolet germicidal lamp, the released ultraviolet rays of which have killing effects on bacteria and viruses, and the ultraviolet germicidal lamp has an enhancing effect on the disinfection of the photocatalyst layer and the decomposition of pollutants. The ultraviolet rays emitted by the ultraviolet germicidal lamp have a shorter wavelength and higher intensity, greatly enhancing the efficacy of the photocatalyst layer in killing germs and decomposing organic substances; (3) The photocatalyst layer has killing effects on viruses and bacteria and decomposition effects on air pollutants such as formaldehyde. The photocatalyst layer is distributed on the annular partition 3, increasing the total coated area of the photocatalyst layer and further enhancing the disinfection and purification capabilities of this mechanism.

[0036] In addition, in this embodiment, a system for pressurizing the internal circulation of building air is also provided, which mainly includes a controller 17, a pressurizing device 18, an air outlet 19, an exhaust air pipe 20, a second check valve 21, an air return port 12, an air return pipe 13, a fan 14, a first check valve 15, a supply air pipe 16, and the above-mentioned pressurizing building air purification mechanism; the air return port 12, the pressurizing building air purification mechanism, the fan 14, and the first check valve 15 are sequentially and spacedly arranged on the air return pipe 13, and the air return port 12 is located at the bottom end of the air return pipe 13, and it is connected to the air inlet 4 at the bottom end of the purification housing 1 of the pressurizing building air purification mechanism through the air return pipe 13, for delivering the circulating air into the pressurizing building air purification mechanism for filtration and purification; the top end of the air return pipe 13 is connected to the supply air pipe 16, and the fan 14 delivers the circulating air introduced from the air return port 12 and purified by the pressurizing building air purification mechanism to the air supply port 22 at the end of the supply air pipe 16. Moreover, the pressurizing device 18 and the second check valve 21 are sequentially installed on the supply air pipe 16, and the air return pipe 13 is located between the second check valve 21 and the air supply port 22; the air outlet 19 is arranged on the exhaust air pipe 20 and is below the air return port 12, and the distance between it and the air return port 12 is less than 1 m; the air volume of the fan 14 is 0.8 - 1.2 times that of the pressurizing device 18; the controller 17 is electrically connected to the pressurizing device 18, the fan 14, and the ultraviolet germicidal lamp in the pressurizing building air purification mechanism respectively, for controlling the opening or closing of the pressurizing device 18, the fan 14, and the ultraviolet germicidal lamp.

[0037] The return air duct 13 is connected to the supply air duct 16, so that the recirculated air conveys the filtered and purified recirculated air to the air supply outlet 22 through the supply air duct 16; the first check valve 15 on the return air duct 13 can prevent fresh air from entering the return air duct 13 when the pressurization device 18 is operating. After the pressurization device 18 is turned off, the controller 17 controls the start of the fan 14 and the ultraviolet germicidal lamp; under the action of the fan 14, the recirculated air enters from the air return inlet 12, and after passing through the pressurized building air purification mechanism and the supply air duct 16, it is conveyed to the air supply outlet 22. After the pressurization device 18 is turned on, the controller 17 controls the shutdown of the fan 14 and the ultraviolet germicidal lamp; the air volume of the fan 14 is 0.8 to 1.2 times that of the pressurization device 18, the straight-line distance between the air return inlet 12 and the air exhaust outlet 19 is within 0.5 meters, the recirculated air volume and the supply air volume are similar, the air outlet positions of the air return inlet 12 and the air exhaust outlet 19 are similar, and after the recirculated air is turned on, an effect similar to "continuous air supply" can be formed.

[0038] It should be noted that the air in the existing pressurized building directly enters the supply air duct 16 from the air return inlet 12 through the return air duct 13 and is sent into the room from the air supply outlet 22. Due to the airtightness of the pressurized building, after the pressurization device 18 stops operating, the indoor air can hardly exchange with the outside world at all. Pollutants emitted by indoor decoration materials, bacteria-carrying aerosols and odor-carrying gases exhaled by human respiration gradually accumulate during the process of the pressurization device 18 stopping operating. Moreover, after the pressurization device 18 stops operating, the indoor air is relatively static, and various pollutants are difficult to be evenly distributed in the building space. Therefore, the phenomenon of local accumulation is likely to occur, which will lead to a situation where the bacteria-carrying aerosol in the human activity area is relatively high. The increase and local accumulation of harmful substances pose potential hazards to people staying in the pressurized building for a long time.

[0039] Therefore, in this pressurized building, by reasonably arranging the positions of the air inlet 4 and the air exhaust outlet 19, and sharing the supply air duct on the indoor side of the pressurization device 18, the air return inlet 12 of the recirculated air is adjacent to the air exhaust outlet 19, and the air volume of the fan 14 is close to that of the pressurization device 18. Therefore, the recirculated air system maintains the original air flow design, and there will be no phenomenon of local pollutant accumulation in the pressurized building. Moreover, a micro-airflow is formed inside the pressurized building, which has the effect of improving indoor comfort. Furthermore, this indoor recirculated air design can be equivalent to the continuous air supply effect of the pressurization device 18, greatly improving the indoor air quality.

[0040] In summary, in the pressurized building air purification mechanism and the system for pressurized building air internal circulation of the present application, there is a pressurized building air purification mechanism that has a strong effect on removing indoor air pollutants, and a system for pressurized building air internal circulation is constructed relying on this pressurized building air purification mechanism. Therefore, when the circulating air passes through the system for pressurized building air internal circulation of the present application, the air therein can be effectively filtered and purified, greatly improving the air quality therein. At the same time, its filter screen 2 has dual functions of filtering and sterilization, and it can filter and sterilize the air in the pressurized building; moreover, the annular partition 3 is used for air flow-through, and the photocatalyst layer on its surface can stimulate the strong oxidation effect of the photocatalyst layer under the irradiation of the ultraviolet germicidal lamp, thereby killing bacteria and decomposing harmful substances in the air; in addition, the ultraviolet rays generated by the ultraviolet germicidal lamp have a disinfection and sterilization effect, and the ultraviolet rays have a short wavelength and high intensity, and the photocatalyst layer excited is more effective; at the same time, the photocatalyst layer is coated on the surfaces of multiple annular partitions 3, effectively increasing the area of the photocatalyst layer and also increasing the contact area between the circulating air and the photocatalyst layer, thereby making the bactericidal and pest control effects of the photocatalyst layer better. Therefore, the circulating air undergoes a filtering effect after passing through the pressurized building air purification mechanism, and harmful substances such as bacteria are killed under the action of silver ions, ultraviolet rays, and the photocatalyst layer, and gases such as formaldehyde in the air are also oxidized and decomposed by the photocatalyst layer, thereby enabling the circulating air to be filtered and purified.

[0041] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pressurized building air purification mechanism, characterized in that, It includes a purification housing, a filter screen, multiple annular partitions, and an ultraviolet germicidal lamp; an air inlet is provided at one end of the purification housing, and an air outlet is provided at the other end; the filter screen and the multiple annular partitions are sequentially and spacedly installed on the inner peripheral wall of the purification housing along the height direction of the purification housing, and the filter screen is adjacent to the air inlet, and a photocatalyst layer is provided on the annular partition; the ultraviolet germicidal lamp sequentially passes through the multiple annular partitions and has a gap with the annular partitions, and the ultraviolet germicidal lamp is used to excite the photocatalyst layer on the annular partition.

2. The pressurized building air purification mechanism according to claim 1, characterized in that, A nano-silver layer is coated on the surface of the filter screen.

3. The pressurized building air purification mechanism according to claim 1, wherein, A support plate is installed on the inner peripheral wall of the purification housing, the support plate is between the filter screen and the bottom of the ultraviolet germicidal lamp, and multiple ventilation holes with a size of 2-10 mm are provided on the support plate, and the total flow-through area of the ventilation holes is 50-80% of the total area of the support plate.

4. The pressurized building air purification mechanism according to claim 1, characterized in that, The gap between the annular partition and the ultraviolet germicidal lamp is 1-3 mm.

5. The pressurized building air purification mechanism according to claim 1, characterized in that, Multiple air flow-through holes are provided on the annular partition, and the effective flow-through area of the air flow-through holes is 20%-60% of the total area of the annular partition.

6. The pressurized building air purification mechanism according to claim 1, wherein, The number of the annular partitions is 5-25, and the distance between two adjacent annular partitions is 5-50 mm.

7. The pressurized building air purification mechanism according to claim 1, wherein, The ultraviolet germicidal lamp includes a lamp tube, a lamp head, and a cable; the lamp head is provided at the bottom of the lowermost annular partition and faces the air inlet; the cable is connected to the lamp head; the lamp tube is installed on the lamp head and sequentially passes through multiple annular partitions, and the lamp tube is an ozone-free ultraviolet germicidal lamp tube.

8. A system for supercharging the internal circulation of building air, characterized in that, It includes a return air outlet, a return air pipeline, a fan, a first check valve, a supply air pipeline, and the pressurized building air purification mechanism according to any one of claims 1 to 7; the return air outlet, the pressurized building air purification mechanism, the fan, and the first check valve are sequentially and spacedly provided on the return air pipeline, and the return air outlet is at the bottom end of the return air pipeline; the top end of the return air pipeline is connected to the supply air pipeline, and the fan conveys the circulating air introduced from the return air outlet and purified by the pressurized building air purification mechanism to the air supply outlet at the end of the supply air pipeline.

9. The system for boosting the internal circulation of building air according to claim 8, characterized in that, It further includes a controller, a pressurization device, an exhaust outlet, an exhaust pipeline, and a second check valve; the pressurization device and the second check valve are sequentially installed on the supply air pipeline, and the return air pipeline is between the second check valve and the air supply outlet; the exhaust outlet is provided on the exhaust pipeline and is below the return air outlet, and the distance from the return air outlet is less than 1 m; the air volume of the fan is 0.8-1.2 times that of the pressurization device; the controller is electrically connected to the pressurization device, the fan, and the ultraviolet germicidal lamp in the pressurized building air purification mechanism respectively, and is used to control the opening or closing of the pressurization device, the fan, and the ultraviolet germicidal lamp.

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