Radioactive air filtering device

Abstract

The utility model discloses a radioactive air filtering device which comprises a filtering box, a pre-filter, a VM1 high-efficiency filter, an iodine adsorber and a VM2 high-efficiency filter are in lap joint in a frame cavity of the filtering box, a first sealing gasket is arranged at the lap joint position of the outer wall of the pre-filter and the frame cavity of the filtering box, and a second sealing gasket is arranged at the lap joint position of the outer wall of the pre-filter and the frame cavity of the filtering box. And the same first sealing gaskets are also arranged at the overlapping parts of the VM1 high-efficiency filter, the iodine adsorber and the VM2 high-efficiency filter with the frame cavity of the filter box. According to the radioactive air filtering device, each filter is pressed and fixed through a pressing handle with damping, and the top of each filter is sealed through a first sealing gasket, so that the air tightness is ensured, the disassembly and assembly of each filter are facilitated, and the adsorption performance of an iodine adsorber is judged by regularly checking the adsorption performance of a smaller carbon tank; the iodine adsorber does not need to be detached during each inspection, so that unnecessary detachment of the iodine adsorber is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering equipment, in particular to a radioactive air filtering device. Background Art

[0002] Existing radioactive air filtration equipment is designed to purify the air from radioactive contaminants. Contaminants may be released from nuclear accidents, medical facilities, industrial processes or other radioactive sources. The core technology of these devices is based on two main principles: adsorption and filtration. Adsorption is achieved by adsorbing radioactive contaminants onto specific adsorption media. Commonly used adsorption media include activated carbon, molecular sieves and ion exchange resins. Filtration is to remove suspended solid radioactive particles in the air through particle filters. These filters are usually made of fiber materials, such as high-efficiency air filters (HEPA). HEPA filters have very small pore sizes that can effectively capture tiny radioactive particles and prevent them from entering the air.

[0003] In order to ensure the high efficiency of radioactive air filtration equipment, it is often necessary to regularly replace the adsorption medium and filter. Monitoring the operating status of the equipment, the concentration of radioactive substances and equipment failures are also important factors. However, the existing radioactive air filtration devices still have some shortcomings. In order to ensure the airtightness of each filter, the assembly is very cumbersome, and most of them are fastened with screws and gaskets. It is very inconvenient to disassemble during regular maintenance. In addition, during each maintenance, it is impossible to take samples in advance to determine the adsorption and filtration performance of the filter, which may easily cause unnecessary disassembly of the filter. Based on this, we have developed a radioactive air filtration device to solve the above problems. Utility Model Content

[0004] The utility model aims to solve the technical problems in the prior art and proposes a radioactive air filtering device.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a radioactive air filtering device, comprising a filter box, a pre-filter, a VM1 high-efficiency filter, an iodine adsorber and a VM2 high-efficiency filter are overlapped in the frame cavity of the filter box respectively, a first sealing gasket is arranged at the overlap between the outer wall of the pre-filter and the frame cavity of the filter box, and the same first sealing gasket is also arranged at the overlap between the VM1 high-efficiency filter, the iodine adsorber and the VM2 high-efficiency filter and the frame cavity of the filter box, a pre-filter pressing mechanism, a VM1 high-efficiency filter pressing mechanism, an iodine adsorber pressing mechanism and a VM2 high-efficiency filter pressing mechanism are respectively arranged at the overlap surface between the frame cavity of the filter box and the pre-filter, the VM1 high-efficiency filter, the iodine adsorber and the VM2 high-efficiency filter, the pre-filter pressing mechanism comprises a pressing handle capable of damping rotation, the pressing handle is pressed on the top of the pre-filter, so that the top of the pre-filter and the frame cavity of the filter box are sealed through the first sealing gasket, and the VM1 high-efficiency filter pressing mechanism, the iodine adsorber pressing mechanism and the VM2 high-efficiency filter pressing mechanism are all of the same structure as the pre-filter pressing mechanism;

[0006] A sampling tank is arranged on the inner wall of the frame cavity of the filter box at the position of the iodine adsorber. The sampling tank comprises a tank body connected to the inner wall of the frame cavity of the filter box and a detachable carbon tank arranged in the inner cavity of the tank body.

[0007] In a preferred embodiment, the pre-filter clamping mechanism also includes a connecting column arranged on the overlapping surface between the frame cavity of the filter box and the pre-filter, a part of the connecting column has a thread, the outer wall of the connecting column is sleeved with a connecting concave frame, the outer wall of the connecting column located above the connecting concave frame is threaded with a first locking nut and a second locking nut, the first locking nut and the second locking nut are pressed on the connecting concave frame, and a spring for supporting the connecting concave frame is also arranged at the bottom of the connecting concave frame, and the clamping handle is arranged in the inner cavity of the connecting concave frame through a damping shaft.

[0008] In a preferred embodiment, the sampling tank also includes a nut, which is screwed on one end of the tank body, and an opening is provided on the outer surface of the nut. A second sealing gasket and a pressure plate are arranged between the nut and the tank body. The nut is pressed against the pressure plate, and the pressure plate is pressed against the second sealing gasket to form a seal.

[0009] In a preferred embodiment, handles are provided on both sides of the top of the pre-filter, and handles of the same structure are also provided on the tops of the VM1 high-efficiency filter, the iodine adsorber and the VM2 high-efficiency filter.

[0010] In a preferred embodiment, one side of the filter box is provided with a pre-filter section sealing door, a VM1 high-efficiency filter section sealing door, an iodine adsorption section sealing door and a VM2 high-efficiency filter section sealing door at positions corresponding to the pre-filter, VM1 high-efficiency filter, iodine adsorber and VM2 high-efficiency filter respectively.

[0011] In a preferred embodiment, a spray head is arranged at the top of the frame cavity of the filter box at a position corresponding to the iodine adsorber, the spray head is connected to a water pipe buried inside the filter box, the water pipe extends to the outer wall of the filter box and is provided with a fire interface, a base is arranged at the bottom of the filter box, a drain pipe is arranged at a position corresponding to the iodine adsorber in the base, and the drain pipe is connected to the frame cavity of the filter box corresponding to the position of the iodine adsorber.

[0012] In a preferred embodiment, an electric heater is provided on one side of the inner cavity of the filter box.

[0013] In a preferred embodiment, the top of the filter box is connected to a pre-filter differential pressure transmitter, a VM1 high-efficiency filter differential pressure transmitter, and a VM2 high-efficiency filter differential pressure transmitter via a pipeline.

[0014] In a preferred embodiment, a connection box is provided on one side of the top of the filter box, and the connection box is electrically connected to an electric control cabinet.

[0015] In a preferred embodiment, a ferrule stop valve is arranged above the filter box through a pipeline, and both ends of the pipeline are respectively connected to the air inlet and outlet of the filter box. A temperature sensor and a temperature and humidity sensor are also respectively arranged above the filter box through two pipelines, and the two ends of the pipeline connected to the temperature sensor are respectively connected to the air outlet of the filter box and the connection box, and the two ends of the pipeline connected to the temperature and humidity sensors are respectively connected to the air inlet of the filter box and the connection box.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The pre-filter of the utility model is used to remove slightly larger particles in the air, which is the first level of filtration of the air. The VM1 high-efficiency filter is used to absorb and filter radioactive aerosols in the air, which is the second level of filtration of the air. The iodine adsorber is used to absorb radioactive iodine in the ventilation system, which is the third level of filtration of the air. The VM2 high-efficiency filter purifies carbon dust that may be carried out of the iodine adsorber by the airflow. In order to purify the last barrier, the pre-filter, the VM1 high-efficiency filter, the iodine adsorber and the VM2 high-efficiency filter cooperate with each other to achieve multi-level filtration, which can more thoroughly remove pollutants in the air and improve the filtration efficiency.

[0018] 2. The utility model can fix each filter in the frame cavity of the filter box through the damping clamping handles in the pre-filter clamping mechanism, VM1 high-efficiency filter clamping mechanism, iodine adsorber clamping mechanism and VM2 high-efficiency filter clamping mechanism, and form a seal on the top thereof through the first sealing gasket, thereby ensuring air tightness and facilitating the disassembly and assembly of each filter;

[0019] 3. The utility model, through the combination of the tank body and the carbon canister that can be removed from the tank body, can determine the adsorption performance of the iodine adsorber by regularly checking the adsorption performance of the smaller carbon canister, without the need to remove the iodine adsorber for each inspection, thereby avoiding unnecessary disassembly of the iodine adsorber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the top view structure of the utility model;

[0022] Figure 3 It is a side cross-sectional structural schematic diagram of the pre-filter pressing mechanism in the utility model;

[0023] Figure 4 This is a schematic diagram of the main cross-sectional structure of the sampling tank in the utility model;

[0024] In the figure: 1, filter box; 2, pre-filter; 201, handle; 202, first sealing gasket; 3, pre-filter clamping mechanism; 301, connecting column; 302, connecting concave frame; 303, first locking nut; 304, second locking nut; 305, clamping handle; 306, spring; 4, pre-filter section sealing door; 5, VM1 high-efficiency filter section sealing door; 6, VM1 high-efficiency filter; 7, pre-filter differential pressure transmitter; 8, VM1 high-efficiency filter differential pressure transmitter; 9, VM2 high-efficiency filter differential pressure transmitter; 10, VM1 high-efficiency filter clamping mechanism; 1 1. Sampling tank; 111. Tank body; 112. Carbon canister; 113. Nut; 114. Opening; 115. Second sealing gasket; 116. Pressure plate; 12. Sprinkler head; 13. Iodine adsorber; 14. Sealing door of iodine adsorption section; 15. Clamping mechanism of iodine adsorber; 16. Sealing door of VM2 high-efficiency filter section; 17. Card sleeve stop valve; 18. VM2 high-efficiency filter; 19. Clamping mechanism of VM2 high-efficiency filter; 20. Temperature sensor; 21. Electric control cabinet; 22. Electric heater; 23. Base; 24. Drain pipe; 25. Connection box; 26. Temperature and humidity sensor. DETAILED DESCRIPTION

[0025] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0026] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this description, those skilled in the art can make creative modifications to the present embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

[0027] The utility model is a radioactive air filtering device, which solves the technical problems in the prior art. The overall idea is as follows: Example

[0028] See Figure 1 , Figure 2 , Figure 3 , Figure 4 A radioactive air filtering device comprises a filter box 1, in which a pre-filter 2, a VM1 high-efficiency filter 6, an iodine adsorber 13 and a VM2 high-efficiency filter 18 are overlapped respectively in the frame cavity of the filter box 1, the pre-filter 2 is used to remove slightly larger particles in the air, and is the first stage of filtration of the air, the VM1 high-efficiency filter 6 is used to adsorb and filter radioactive aerosols in the air, and is the second stage of filtration of the air, the iodine adsorber 13 uses a type II iodine adsorber to adsorb radioactive iodine in the ventilation system, and is the third stage of filtration of the air, the rated air volume of each type II iodine adsorber is 567m3 / h, and the leakage rate is ≤0.01% (Freon), the VM2 high-efficiency filter 18 purifies carbon dust that may be carried out of the iodine adsorber by the airflow, and in order to purify the last barrier, a first sealing gasket 202 is arranged at the overlap between the outer wall of the pre-filter 2 and the frame cavity of the filter box 1, and the VM1 high-efficiency filter 6 is used to adsorb and filter radioactive aerosols in the air, and is the second stage of filtration of the air, and the iodine adsorber 13 uses a type II iodine adsorber to adsorb radioactive iodine in the ventilation system, and is the third stage of filtration of the air, the rated air volume of each type II iodine adsorber is 567m3 / h, and the leakage rate is ≤0.01% (Freon), the VM2 high-efficiency filter 18 purifies carbon dust that may be carried out by the airflow from the iodine adsorber, and in order to purify the last barrier, a first sealing gasket 202 is arranged at the overlap between the outer The frame cavity overlap of the high-efficiency filter 6, the iodine adsorber 13 and the VM2 high-efficiency filter 18 and the filter box 1 is also provided with the same first sealing gasket 202, the frame cavity of the filter box 1 and the overlapping surface of the pre-filter 2, the VM1 high-efficiency filter 6, the iodine adsorber 13 and the VM2 high-efficiency filter 18 are respectively provided with a pre-filter pressing mechanism 3, a VM1 high-efficiency filter pressing mechanism 10, an iodine adsorber pressing mechanism 15 and a VM2 high-efficiency filter pressing mechanism 19, the pre-filter pressing mechanism 3 includes a pressing handle 305 that can damp the rotation, the pressing handle 305 is pressed on the top of the pre-filter 2, so that the top of the pre-filter 2 and the frame cavity of the filter box 1 are sealed by the first sealing gasket 202, and the VM1 high-efficiency filter pressing mechanism 10, the iodine adsorber pressing mechanism 15 and the VM2 high-efficiency filter pressing mechanism 19 are all the same structure as the pre-filter pressing mechanism 3;

[0029] A sampling tank 11 is provided on the inner wall of the frame cavity of the filter box 1 at the position of the iodine adsorber 13. The sampling tank 11 includes a tank body 111 connected to the inner wall of the frame cavity of the filter box 1 and a detachable carbon tank 112 provided in the inner cavity of the tank body 111. The adsorption performance of the iodine adsorber 13 can be judged by regularly checking the adsorption performance of the carbon tank 112, without the need to remove the iodine adsorber 13 every time the inspection is performed.

[0030] During specific implementation, multiple sampling tanks 11 can also be provided, which are respectively installed in the pre-filtration section, VM1 high-efficiency filtration section, iodine adsorption section and VM2 high-efficiency filtration section, so as to facilitate the judgment of the adsorption and filtration performance at each stage.

[0031] During specific implementation, the pre-filter clamping mechanism 3 also includes a connecting column 301 arranged on the overlapping surface between the frame cavity of the filter box 1 and the pre-filter 2, a part of the connecting column 301 has a thread, the outer wall of the connecting column 301 is sleeved with a connecting concave frame 302, the outer wall of the connecting column 301 located above the connecting concave frame 302 is screwed with a first locking nut 303 and a second locking nut 304, the first locking nut 303 and the second locking nut 304 are pressed on the connecting concave frame 302, and a spring 306 for supporting the connecting concave frame 302 is also provided at the bottom of the connecting concave frame 302, the spring 306 is used to support the connecting concave frame 302 so that the connecting concave frame 302 is flush with the top of the pre-filter 2 so that the clamping handle 305 is pressed on the top of the pre-filter 2 when it is rotated, and the clamping handle 305 is arranged in the inner cavity of the connecting concave frame 302 through a damping shaft.

[0032] In a specific implementation, the sampling tank 11 also includes a nut 113, which is screwed on one end of the tank body 111. An opening 114 is provided on the outer surface of the nut 113. A second sealing gasket 115 and a pressure plate 116 are provided between the nut 113 and the tank body 111. The nut 113 is pressed against the pressure plate 116, and the pressure plate 116 is pressed against the second sealing gasket 115 to form a seal. During use, the pressure plate 116 is removed from the nut 113 to facilitate the passage of gas. During the inspection, when the carbon canister 112 is taken out, the pressure plate 116 is put back in to block the opening 114, so that the gas cannot pass through after the blocking.

[0033] In specific implementation, handles 201 are provided on both sides of the top of the pre-filter 2 , and handles 201 of the same structure are also provided on the tops of the VM1 high-efficiency filter 6 , the iodine adsorber 13 and the VM2 high-efficiency filter 18 .

[0034] During specific implementation, one side of the filter box 1 is provided with a pre-filter section sealing door 4, a VM1 high-efficiency filter section sealing door 5, an iodine adsorption section sealing door 14 and a VM2 high-efficiency filter section sealing door 16 at positions corresponding to the pre-filter 2, the VM1 high-efficiency filter 6, the iodine adsorber 13 and the VM2 high-efficiency filter 18, respectively, and sealing strips are pasted thereon to form a seal, thereby ensuring that the filter box 1 meets the airtightness requirements.

[0035] During specific implementation, a spray head 12 is provided at a position corresponding to the iodine adsorber 13 on the top of the frame cavity of the filter box 1, the spray head 12 is connected to a water pipe buried inside the filter box 1, the water pipe extends to the outer wall of the filter box 1 and a fire interface is provided, a base 23 is provided at the bottom of the filter box 1, a drain pipe 24 is provided at a position corresponding to the iodine adsorber 13 in the base 23, and the drain pipe 24 is connected to the frame cavity of the filter box 1 corresponding to the position of the iodine adsorber 13, the adsorbent in the iodine adsorber 13 is activated carbon, which is a combustible material, the spray head 12 can spray water to prevent the activated carbon from catching fire and causing a fire, and the drain pipe 24 is used to discharge sewage after the spray fire is extinguished.

[0036] During specific implementation, an electric heater 22 is provided on one side of the inner cavity of the filter box 1 , and the electric heater is used to reduce the relative humidity of the air entering the filter box 1 to ensure the adsorption performance of the iodine adsorber.

[0037] During specific implementation, the top of the filter box 1 is connected to a pre-filter differential pressure transmitter 7 , a VM1 high-efficiency filter differential pressure transmitter 8 , and a VM2 high-efficiency filter differential pressure transmitter 9 through pipelines.

[0038] During specific implementation, a connection box 25 is provided on one side of the top of the filter box 1 , and the connection box 25 is electrically connected to the electric control cabinet 21 .

[0039] During specific implementation, a ferrule stop valve 17 is provided above the filter box 1 through a pipeline, and both ends of the pipeline are respectively connected to the air inlet and outlet of the filter box 1. A temperature sensor 20 and a temperature and humidity sensor 26 are also provided above the filter box 1 through two pipelines. The two ends of the pipeline connected to the temperature sensor 20 are respectively connected to the air outlet of the filter box 1 and the connection box 25, and the two ends of the pipeline connected to the temperature and humidity sensor 26 are respectively connected to the air inlet of the filter box 1 and the connection box 25.

[0040] When in use, the air is sent to the pre-filter 2 for primary filtration to remove slightly larger particles in the air, and then enters the VM1 high-efficiency filter 6 for secondary filtration to adsorb and filter radioactive aerosols in the air, and then enters the iodine adsorber 13 for tertiary filtration to adsorb radioactive iodine in the ventilation system, and finally enters the VM2 high-efficiency filter 18 for final purification to purify carbon dust that may be carried out by the airflow from the iodine adsorber 13. After multi-level filtration, the air can more thoroughly remove pollutants in the air;

[0041] When inspecting the pre-filter 2, VM1 high-efficiency filter 6, iodine adsorber 13 and VM2 high-efficiency filter 18, first unscrew the nut 113 in the sampling tank 11, remove the carbon canister 112, and judge the adsorption performance of each filter by checking the adsorption performance of the carbon canister 112 to decide whether the filter needs to be disassembled and replaced. If disassembly is required, forcefully turn the clamping handle 305 outward to keep the clamping handle 305 away from the top of each filter. At this time, each filter can be taken out of the filter box 1 by the handle 201 to complete the disassembly. The operation is simple and flexible to use.

[0042] The above description of the embodiments is to facilitate ordinary technicians in this technical field to understand and use the utility model. It is obvious that those familiar with the technology in this field can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the utility model is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the utility model without departing from the scope of the utility model should be within the protection scope of the utility model.

Claims

1. A radioactive air filtering device, characterized in that: The invention comprises a filter box (1), wherein a pre-filter (2), a VM1 high-efficiency filter (6), an iodine adsorber (13) and a VM2 high-efficiency filter (18) are overlapped in a frame cavity of the filter box (1), a first sealing gasket (202) is provided at a joint between an outer wall of the pre-filter (2) and the frame cavity of the filter box (1), and a first sealing gasket (202) is also provided at a joint between the VM1 high-efficiency filter (6), the iodine adsorber (13) and the VM2 high-efficiency filter (18) and the frame cavity of the filter box (1). A pre-filter pressing mechanism (3), a VM1 high-efficiency filter pressing mechanism (10), an iodine adsorber pressing mechanism (15) and a VM2 high-efficiency filter pressing mechanism (19) are respectively arranged on the surface, the pre-filter pressing mechanism (3) comprising a pressing handle (305) capable of damping rotation, the pressing handle (305) pressing on the top of the pre-filter (2) so that the top of the pre-filter (2) and the frame cavity of the filter box (1) are sealed through the first sealing gasket (202), the VM1 high-efficiency filter pressing mechanism (10), the iodine adsorber pressing mechanism (15) and the VM2 high-efficiency filter pressing mechanism (19) are all of the same structure as the pre-filter pressing mechanism (3); A sampling tank (11) is arranged on the inner wall of the frame cavity of the filter box (1) at the position of the iodine adsorber (13), and the sampling tank (11) comprises a tank body (111) connected to the inner wall of the frame cavity of the filter box (1) and a detachable carbon tank (112) arranged in the inner cavity of the tank body (111).

2. A radioactive air filtering device according to claim 1, characterized in that: The pre-filter pressing mechanism (3) further comprises a connecting column (301) arranged on the overlapped surface between the frame cavity of the filter box (1) and the pre-filter (2); a portion of the connecting column (301) has a thread; an outer wall of the connecting column (301) is sleeved with a connecting concave frame (302); a first locking nut (303) and a second locking nut (304) are screwed onto the outer wall of the connecting column (301) located above the connecting concave frame (302); the first locking nut (303) and the second locking nut (304) are pressed onto the connecting concave frame (302); a spring (306) for supporting the connecting concave frame (302) is further arranged at the bottom of the connecting concave frame (302); and the pressing handle (305) is arranged in the inner cavity of the connecting concave frame (302) via a damping shaft.

3. A radioactive air filtering device according to claim 2, characterized in that: The sampling tank (11) further comprises a nut (113), wherein the nut (113) is screwed onto one end of the tank body (111), an opening (114) is provided on the outer surface of the nut (113), a second sealing gasket (115) and a pressing plate (116) are provided between the nut (113) and the tank body (111), the nut (113) is pressed against the pressing plate (116), and the pressing plate (116) is pressed against the second sealing gasket (115) to form a seal.

4. A radioactive air filter according to any one of claims 1 to 3, characterized in that: Handles (201) are provided on both sides of the top of the pre-filter (2), and handles (201) of the same structure are also provided on the tops of the VM1 high-efficiency filter (6), the iodine adsorber (13), and the VM2 high-efficiency filter (18).

5. A radioactive air filtering device according to claim 4, characterized in that: A pre-filter section sealing door (4), a VM1 high-efficiency filter section sealing door (5), an iodine adsorption section sealing door (14) and a VM2 high-efficiency filter section sealing door (16) are respectively provided on one side of the filter box (1) at positions corresponding to the pre-filter (2), the VM1 high-efficiency filter (6), the iodine adsorber (13) and the VM2 high-efficiency filter (18).

6. A radioactive air filtering device according to claim 5, characterized in that: A spray head (12) is arranged at a position corresponding to the iodine adsorber (13) on the top of the frame cavity of the filter box (1); the spray head (12) is connected to a water pipe buried in the filter box (1); the water pipe extends to an outer wall of the filter box (1) and is provided with a fire interface; a base (23) is arranged at the bottom of the filter box (1); a drain pipe (24) is arranged at a position corresponding to the iodine adsorber (13) in the base (23); and the drain pipe (24) is connected to the frame cavity of the filter box (1) at the position corresponding to the iodine adsorber (13).

7. A radioactive air filtering device according to claim 6, characterized in that: An electric heater (22) is provided on one side of the inner cavity of the filter box (1).

8. A radioactive air filtering device according to claim 7, characterized in that: The top of the filter box (1) is connected to a pre-filter differential pressure transmitter (7), a VM1 high-efficiency filter differential pressure transmitter (8), and a VM2 high-efficiency filter differential pressure transmitter (9) via a pipeline.

9. A radioactive air filtering device according to claim 8, characterized in that: A connection box (25) is provided on one side of the top of the filter box (1), and the connection box (25) is electrically connected to the electric control cabinet (21).

10. A radioactive air filtering device according to claim 9, characterized in that: A ferrule stop valve (17) is provided above the filter box (1) through a pipeline, and the two ends of the pipeline are respectively connected to the air inlet and outlet of the filter box (1). A temperature sensor (20) and a temperature and humidity sensor (26) are also provided above the filter box (1) through two pipelines, respectively. The two ends of the pipeline connected to the temperature sensor (20) are respectively connected to the air outlet of the filter box (1) and the connection box (25), and the two ends of the pipeline connected to the temperature and humidity sensor (26) are respectively connected to the air inlet of the filter box (1) and the connection box (25).

Images