Return air filtering device for subway air conditioner

Abstract

The return air filtering device comprises a frame body, the frame body is of a hollow rectangular structure, the upper edge of the outer wall of the frame body is fixedly connected with a connecting flange plate, the frame body is connected to the top of a subway carriage through the connecting flange plate, one end in the frame body is rotationally connected with a sealing plate, and the middle of the side wall of one side of the sealing plate is detachably connected with a concentration box; compared with the prior art, the invention has the following advantages: the plurality of filter plates are connected in the inner tank, and each filter plate is filled with different filter materials, so that various filter effects can be realized, the filter plates are provided with the filter holes, so that the filter plates have a double filter effect, the filter holes can filter impurities such as dust, and the filter efficiency is improved. And the internal filter material can filter some pollutants in the air, so that the dual-purification effect is achieved, the problems of incomplete purification and the like caused by a single filter structure are solved, the filtering and purifying effects are improved, and the purity of the return air is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of subway air-conditioning ventilation structures, and in particular to a return air filtering device for subway air-conditioning. Background Art

[0002] The subway is one of the main means of transportation for people nowadays. As the name suggests, the subway is a rail transit facility built underground. Because it is located underground and many people choose to travel by subway, the subway is usually crowded, which reduces the space in the subway and easily leads to poor air circulation, affecting people's riding experience. Therefore, air conditioning and ventilation facilities are installed in the subway. In order to save energy, the air circulating in the subway is generally recycled and reused. This process is called return air.

[0003] Because the circulating air is recycled, and some debris and dust will be carried along when the air circulates in the subway, it is necessary to install filtering equipment at the return air outlet to ensure that the recycled air is filtered and purified to prevent dust or viruses from circulating in the subway.

[0004] The current return air filter has few filter layers due to limited space, and the filtering method is relatively simple, generally only filtering dust particles, etc., and other debris in the air cannot be filtered well. In the return air process, the air generally passes through the filter layer in a straight manner, resulting in the air not being well purified. The current filtering structure is not easy to disassemble and maintain, so a return air filter device for subway air conditioning is proposed here. Summary of the invention

[0005] The technical problem to be solved by the present invention is that the current return air filtration purification effect is poor, the filtration method is single and it is not convenient to disassemble and maintain. A return air filtration device for subway air conditioning is provided, which can perform multiple purification filtrations, increase the types and methods of purification, and improve the convenience of disassembly and maintenance.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a return air filter device for a subway air conditioner, comprising a frame, the frame is a hollow rectangular structure, a connecting flange plate is fixedly connected to the upper edge of the outer wall of the frame, the frame is connected to the top of the subway car through the connecting flange plate, one end of the frame is rotatably connected to a sealing plate, the middle of one side wall of the sealing plate is detachably connected to a concentration box, a filter plate and a partition plate are connected to the concentration box, the upper edge of the opening of one end of the concentration box is rotatably connected to a closing plate, and a fixing block is fixedly connected to the upper side wall of the sealing plate and close to the closing plate;

[0007] Both side walls of the sealing plate near one end are rotatably connected with movable columns, and a sleeve is telescopically sleeved on the movable column. The end of the sleeve away from the movable column is rotatably connected in the frame. A locking plate is set at one end of the sealing plate and near the two side corners.

[0008] As a preferred technical solution of the present invention, an inner groove is provided inside the central box, and three limit blocks are fixedly connected to the opposite side walls in the inner groove, and a slide groove is provided in the middle of the side walls opposite to each other of the limit blocks, and the filter plate is inserted in the slide groove by sliding at both ends, and the partition plate is detachably connected to the side walls of the inner groove through the side walls at both ends. Two partition plates are provided and located between the two filter plates, and ventilation holes are provided through the partition plate, and the positions of the two ventilation holes are opposite. A filling groove is provided in the filter plate, and the filling groove is filled with filter material. The size of the filter holes on the side walls of the three filter plates gradually decreases from bottom to top, and the side walls on both sides of the inner groove are detachably inlaid with disinfection lamps.

[0009] As a preferred technical solution of the present invention, an air duct is detachably connected to the middle of the side wall of the central box away from the sealing plate, an exhaust fan is rotatably connected inside the air duct, and a soft air duct is detachably connected to one end of the air duct away from the central box, and the soft air duct is detachably connected to the air duct of the air conditioner through the end thereof away from the air duct.

[0010] As a preferred technical solution of the present invention, a sealing rubber pad is fixedly connected to the side wall of one side of the closing plate, and the sealing rubber pad is fitted with one end of the filter plate and the partition plate through its side away from the closing plate. The sealing rubber pad is a conical structure and the side wall is fitted with the inner wall of the opening of the concentration box.

[0011] As a preferred technical solution of the present invention, a blocking stud is inserted and connected with the middle thread of the fixed block, one end of the blocking stud is fixedly connected with a knob, one end of the blocking stud passes through the fixed block and is rotatably connected with a push plate, and the side wall of the push plate away from the blocking stud is fixedly connected with an anti-slip pad, and the anti-slip pad is fitted in the middle of the outer wall of the closing plate.

[0012] As a preferred technical solution of the present invention, a connecting block is fixedly connected to the side wall at one end of the frame, and slots are provided at the bottom of the connecting block and near the side walls at both ends. The sleeve is rotatably connected to the side walls of the connecting block on both sides that are away from each other through one end thereof, and a rotating groove is provided in the connecting block and above the slot. The locking plate passes through the slot and is rotatably inserted in the rotating groove. The bottom of the locking plate and near the side walls at both ends are fixedly connected to a pressing plate, and a top support plate is fixedly connected to the bottom side wall in the rotating groove. The top support plate and the pressing plate are relative trapezoidal structures, and the bottom side wall of the connecting block is in contact with the top side wall of the sealing plate.

[0013] As a preferred technical solution of the present invention, the sealing plate is provided with docking grooves near both ends, a linkage column is fixedly connected to the middle of the bottom side wall of the locking plate, one end of the linkage column is inserted and rotatably connected in the docking groove, a groove is provided at the bottom of the sealing plate and at a position opposite to the docking groove, one end of the linkage column passes through the bottom of the docking groove and is rotatably connected to a toggle piece, and the toggle piece is a semicircular sheet structure

[0014] As a preferred technical solution of the present invention, a connecting hole is opened through the middle of the sealing plate, an adsorption mesh plate is detachably embedded and connected inside the connecting hole, and filter holes are opened on the adsorption mesh plate, and a grille is detachably connected to the bottom opening of the connecting hole, a curly brush is fixed to the side wall of the adsorption mesh plate opposite to the grille, and the connecting hole is communicated with the interior of the concentration box.

[0015] The present invention has the following advantages: a plurality of filter plates are connected inside the inner tank, and different filter materials are filled in each filter plate, so that multiple filtering effects can be achieved, and the filter plate itself is provided with filter holes, so that the filter plate can have a double filtering effect, the filter holes can filter impurities such as dust, and the internal filter material can filter some pollutants in the air, so as to achieve a double purification effect, avoid the problem of incomplete purification caused by a single filtering structure, improve the filtering and purification effect, and ensure the purity of the return air;

[0016] A partition plate is set between every two filter plates, and the vents on the two partition plates are in opposite positions, so that the air passing through the filter plate will be retained and flow between the filter plate and the partition plate, and finally gradually discharged from the vents, which can increase the retention time of the air. The disinfection lamp installed in the inner tank can disinfect and purify the retained air, improve the purification means and purification effect, and increase the performance of the filtering equipment;

[0017] When maintenance is required, pull the closing plate out of the frame, then rotate the blocking studs to withdraw the anti-slip pad from the side wall of the closing plate, then lift the closing plate, and finally pull the filter plate that needs maintenance or replacement out of the central box as needed, thereby improving the convenience of disassembly and assembly, and moving the central box from the top of the subway to the inside of the car, which greatly increases the operating space and avoids the impact of space limitations on disassembly and delays in maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a three-dimensional unfolded structure of a preferred embodiment of the present invention;

[0019] Figure 2 It is a bottom-up stereoscopic structural schematic diagram of a preferred embodiment of the present invention;

[0020] Figure 3 It is a schematic diagram of the exploded structure of the sealing plate of a preferred embodiment of the present invention;

[0021] Figure 4 This is a schematic diagram of the three-dimensional structure of a centralized box according to a preferred embodiment of the present invention;

[0022] Figure 5 It is a schematic diagram of the decomposed structure of the filter plate and the spacer plate of a preferred embodiment of the present invention;

[0023] Figure 6 It is a schematic diagram of the three-dimensional structure of a blocking stud according to a preferred embodiment of the present invention;

[0024] Figure 7 It is a partial bottom-up stereoscopic structural schematic diagram of a preferred embodiment of the present invention;

[0025] Figure 8 It is a partial half-section structural schematic diagram of a preferred embodiment of the present invention.

[0026] Explanation of the reference numerals: 1. frame; 2. connecting flange plate; 3. sealing plate; 4. central box; 5. air cylinder; 6. flexible air duct; 7. sleeve; 8. movable column; 9. closing plate; 10. fixing block; 11. locking plate; 12. connecting hole; 13. adsorption mesh plate; 14. grille; 15. groove; 16. toggle plate; 17. sealing rubber pad; 18. inner groove; 19. limit block; 20. filter plate; 21. partition plate; 22. disinfection lamp; 23. filling slot; 24. vent; 25. blocking stud; 26. push plate; 27. anti-slip pad; 28. connecting block; 29. ​​slot; 30. docking slot; 31. linkage column; 32. pressing plate; 33. rotating slot; 34. top support plate. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Embodiment 1

[0029] Please refer to Figure 1 , 4 -5, the present invention is a return air filter device for subway air conditioner, comprising a frame 1, the frame 1 is a hollow rectangular structure, the upper edge of the outer wall of the frame 1 is fixedly connected with a connecting flange plate 2, the frame 1 is connected to the top of the subway car through the connecting flange plate 2, one end of the frame 1 is rotatably connected with a sealing plate 3, the middle of one side wall of the sealing plate 3 is detachably connected with a concentration box 4, a filter plate 20 and a partition plate 21 are connected in the concentration box 4, the upper edge of the opening of one end of the concentration box 4 is rotatably connected with a closing plate 9, and a fixing block 10 is fixedly connected with the upper side wall of the sealing plate 3 and close to the closing plate 9;

[0030] An inner groove 18 is provided inside the central box 4, and three limit blocks 19 are fixedly connected to the opposite side walls of the inner groove 18. A slide groove is provided in the middle of the side walls opposite to each other of the limit blocks 19. The filter plate 20 is inserted into the slide groove by sliding at both ends. The partition plate 21 is detachably connected to the side walls of the inner groove 18 through the side walls at both ends. Two partition plates 21 are provided and are located between the two filter plates 20. A vent hole 24 is provided through the partition plate 21. The positions of the two vent holes 24 are opposite to each other. A filling groove 23 is opened in the plate 20, and the filling groove 23 is filled with filter material. The size of the filter holes on the side walls of the three filter plates 20 gradually decreases from bottom to top. The side walls on both sides of the inner groove 18 are detachably embedded with disinfection lamps 22. The middle of the side wall of the central box 4 away from the sealing plate 3 is detachably connected to the air duct 5, and the inside of the air duct 5 is rotatably connected to the exhaust fan. The end of the air duct 5 away from the central box 4 is detachably connected to the soft air duct 6, and the soft air duct 6 is detachably connected to the air duct of the air conditioner through its end away from the air duct 5.

[0031] The technical effect of this embodiment is as follows: different filter materials are filled in the filling slot 23 of each filter plate 20, so that unused impurities in the air can be filtered. In this way, the diversity of filtering can be effectively improved, the coverage rate of filtering and purification can be improved, and the problem of incomplete purification caused by single filtering can be avoided. Moreover, because the filter plate 20 itself has filter holes, it can filter dust particles and special impurities. Each filter plate 20 has a double filtering effect. Moreover, because the filter holes on the filter plate 20 are gradually reduced, the dust particles can be fully covered to ensure the interception effect of filtering.

[0032] Because the partition plate 21 is connected in the inner tank 18, the air passing through the filter plate 20 will be retained between the filter plate 20 and the partition plate 21 and flow toward the vent 24. Finally, the air will continue to move upward through the vent 24, and this process will increase the retention time of the air. In the second process, the disinfection lamp 22 installed on the side wall of the inner tank 18 can irradiate and disinfect the air, thereby improving the purification effect on the basis of the filter plate 20.

[0033] The air can be pumped from bottom to top through the wind tube 5 and the exhaust fan therein, achieving the effect of air return. The power provided by the exhaust fan can ensure that the air flows smoothly in the concentration box 4, thereby completing the purification effect, and then the purified air is sent into the air-conditioning duct through the soft air duct 6.

[0034] Embodiment 2

[0035] Please refer to Figure 1-3A connecting hole 12 is provided in the middle of the sealing plate 3, and an adsorption mesh plate 13 is detachably embedded in the connecting hole 12, and filter holes are provided on the adsorption mesh plate 13. A grille 14 is detachably connected to the bottom opening of the connecting hole 12, and a curly brush is fixed on the side wall opposite to the adsorption mesh plate 13 and the grille 14, and the connecting hole 12 is communicated with the interior of the concentration box 4.

[0036] The technical effect of this embodiment is as follows: the adsorption mesh plate 13 can perform initial filtration on the air, and the grille 14 can protect the passengers to prevent passengers who are too tall from touching the adsorption mesh plate 13 and causing dust to fall on the passengers. In order to achieve the dust adsorption effect, a curved brush is fixed on the adsorption mesh plate 13, so that the filtered and trapped dust will be restricted by the brush, effectively reducing the dust falling rate and ensuring the cleanliness of the car. The adsorption mesh plate 13 is made opposite to the inside of the concentration box 4 through the connecting hole 12, so that the exhaust fan can smoothly pass through the adsorption mesh plate 13 and the grille 14 to suck the air in the car back.

[0037] Embodiment 3

[0038] Please refer to Figure 1 , 3 and 6, a sealing rubber pad 17 is fixedly connected to the side wall of one side of the closing plate 9, and the sealing rubber pad 17 is fitted with one end of the filter plate 20 and the spacer plate 21 through its side away from the closing plate 9. The sealing rubber pad 17 is a conical structure and the side wall is fitted with the inner wall of the opening of the central box 4. A blocking stud 25 is inserted and connected with the middle thread of the fixed block 10, and one end of the blocking stud 25 is fixedly connected with a knob. The blocking stud 25 passes through one end of the fixed block 10 and is rotatably connected to a push plate 26. The side wall of the push plate 26 away from the blocking stud 25 is fixedly connected with an anti-skid pad 27, and the anti-skid pad 27 is fitted in the middle of the outer wall of the closing plate 9.

[0039] The technical effect of this embodiment is as follows: the closing plate 9 is closed on the opening at one end of the central box 4. Because the sealing rubber pad 17 fits with the inner wall of the opening, and because the sealing rubber pad 17 is a conical structure, as the tightness of the closing of the closing plate 9 is improved, the sealing after closing will also be improved synchronously, ensuring that the interior of the central box 4 is in a relatively sealed state, ensuring the smooth flow of the sucked air, and avoiding the problem of air leakage. At the same time, the sealing rubber pad 17 has a certain thickness, so when the closing plate 9 is closed, the sealing rubber pad 17 will also fit on one end of the filter plate 20 and the partition plate 21. As the closing plate 9 is pushed through the sealing rubber pad 17, an extrusion force will be applied to the filter plate 20 and the partition plate 21, thereby providing a pressing effect for the filter plate 20 and the partition plate 21, ensuring the stability of the connection between the filter plate 20 and the partition plate 21;

[0040] To ensure the tightness and stability of the closing of the closing plate 9, the locking stud 25 is rotated after the closing plate 9 is closed. The push plate 26 and the anti-slip pad 27 are driven to gradually approach the closing plate 9 through the principle of threaded connection. As the locking stud 25 rotates, the pressing force applied to the closing plate 9 is gradually increased, thereby ensuring the stability and tightness of the closing of the closing plate 9. In this way, after the closing plate 9 is closed, the sealing rubber pad 17 exerts a pressing force on the partition plate 21 and the filter plate 20 while ensuring the sealing performance after closure.

[0041] Embodiment 4

[0042] Please refer to Figure 1 , 7 -8, both side walls of the sealing plate 3 near one end are rotatably connected with movable columns 8, a sleeve 7 is telescopically sleeved on the movable column 8, and one end of the sleeve 7 away from the movable column 8 is rotatably connected in the frame 1, and a locking plate 11 is set at one end of the sealing plate 3 and near the two side corners, a connecting block 28 is fixedly connected to the side wall at one end of the frame 1, and slots 29 are opened at the bottom of the connecting block 28 and near the two end side walls, the sleeve 7 is rotatably connected to the two side walls of the connecting block 28 away from each other through one end thereof, and a rotation groove 33 is opened in the connecting block 28 and above the slot 29, the locking plate 11 passes through the slot 29 and is rotatably inserted into the rotation groove 33, and the bottom of the locking plate 11 The side walls near both ends are fixedly connected to the pressing plate 32, and the bottom side wall in the rotating groove 33 is fixedly connected to the top support plate 34. The top support plate 34 and the pressing plate 32 are relatively trapezoidal structures. The bottom side wall of the connecting block 28 is in contact with the top side wall of the sealing plate 3. The sealing plate 3 is provided with docking grooves 30 near both ends. A linkage column 31 is fixedly connected to the middle of the bottom side wall of the locking plate 11, and one end of the linkage column 31 is inserted and rotatably connected in the docking groove 30. A groove 15 is provided at the bottom of the sealing plate 3 and at a position opposite to the docking groove 30. One end of the linkage column 31 passing through the bottom of the docking groove 30 is horizontally rotatably connected to a toggle plate 16, and the toggle plate 16 is a semicircular sheet structure.

[0043] The technical effect of this embodiment is as follows: the sealing plate 3 is closed in the frame body 1, and the locking plate 11 will be inserted into the corresponding slot 29 and finally into the rotating groove 33 after closing. Then, the toggle piece 16 is held and rotated, so that the partition plate 21 and the locking plate 11 can be driven to rotate synchronously. As the locking plate 11 rotates, the pressing plate 32 and the top support plate 34 will fit in contact with each other. As the locking plate 11 continues to rotate, the inclined surface of the pressing plate 32 moves upward along the inclined surface of the top support plate 34, so that the sealing plate 3 can be driven to move upward, thereby increasing the tightness of the sealing plate 3 and the frame body 1. When the horizontal surface of the pressing plate 32 is fitted with the horizontal surface of the top support plate 34 to complete the locking, after locking, the toggle piece 16 is rotated to fit on the side wall of the groove 15 to ensure the horizontal state of the bottom of the sealing plate 3, and the tightness of the connection between the pressing plate 32 and the top support plate 34 can avoid the problem of accidental opening of the sealing plate 3. When it needs to be opened, it only needs to rotate the toggle piece 16 in the opposite direction.

[0044] The extended sleeve 7 and the movable column 8 can limit the unfolded sealing plate 3, ensuring that the unfolded sealing plate 3 is stable at a certain tilt angle, which is convenient for the staff to handle. The sleeve 7 and the movable column 8 are retractable structures, and both ends are rotatably connected, which can avoid movement interference of the sealing plate 3 during the activity and ensure the smoothness of the unfolding and closing of the sealing plate 3.

[0045] Specifically, when the present invention is used, the exhaust fan in the air duct 5 is started, and the air in the subway car can be sucked by the exhaust fan to achieve the return air effect. The sucked air first passes through the adsorption mesh plate 13 for preliminary filtration and then enters the concentration box 4. After entering the concentration box 4, the air passes through the filter plate 20, and the air is double-filtered by the filter holes of the filter plate 20 itself and the filter material filled in the filter plate 20. At the same time, the air can be irradiated and sterilized by the turned-on disinfection lamp 22. The air passing through the filter plate 20 is retained in the filter plate 20 and the partition plate 21, and then gradually moves upward through the vent 24. Because the increase in the retention time also increases the irradiation time, the sterilization effect is improved. As the air rises, it is finally transferred into the air-conditioning duct through the soft air duct 6, and the return air filtration and purification process is completed.

[0046] When maintenance is required, the toggle piece 16 is bent from the groove 15 to a vertical state, and then the toggle piece 16 is held and applied with a rotational force to drive the linkage column 31 and the locking plate 11 to rotate synchronously. As the pressing plate 32 and the top support plate 34 are rotated, they gradually disengage, and then the locking plate 11 is pulled out of the rotation groove 33 and the slot 29, so that the sealing plate 3 is unfolded downward from the frame 1. During the unfolding process, the sleeve 7 and the movable column 8 are also extended synchronously to ensure that the sealing plate 3 is unfolded smoothly and the sealing plate 3 is limited to ensure that the sealing plate 3 is fixed at a certain inclination angle. After the sealing plate 3 is unfolded and stable, the blocking stud 25 is rotated to drive the anti-slip pad 27 to gradually move away from the closing plate 9, and then the closing plate 9 is opened. After that, the filter assembly in the concentration box 4 can be maintained and cleaned. After the maintenance is completed, the above process can be reversed to complete the closure.

[0047] 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 modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

[0048] Other parts of the present invention not described in detail belong to the prior art and will not be described in detail here.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A return air filter device for a subway air conditioner, comprising a frame (1), characterized in that: The frame (1) is a hollow rectangular structure. A connecting flange plate (2) is fixedly connected to the upper edge of the outer wall of the frame (1). The frame (1) is connected to the top of the subway car through the connecting flange plate (2). A sealing plate (3) is rotatably connected to one end of the frame (1). A centralizing box (4) is detachably connected to the middle of a side wall of one side of the sealing plate (3). A filter plate (20) and a partition plate (21) are connected to the centralizing box (4). A closing plate (9) is rotatably connected to the upper edge of the opening of one end of the centralizing box (4). A fixing block (10) is fixedly connected to the upper side wall of the sealing plate (3) and close to the closing plate (9). Both side walls of the sealing plate (3) close to one end are rotatably connected to movable columns (8), a sleeve (7) is telescopically sleeved on the movable column (8), and one end of the sleeve (7) away from the movable column (8) is rotatably connected in the frame (1), and a locking plate (11) is provided at one end of the sealing plate (3) and close to the two side corners.

2. A return air filter device for subway air conditioning as claimed in claim 1, characterized in that: An inner groove (18) is provided inside the central box (4), and three limit blocks (19) are fixedly connected to the opposite side walls of the inner groove (18), and a slide groove is provided in the middle of the side walls opposite to each other of the limit blocks (19). The filter plate (20) is inserted into the slide groove by sliding at both ends, and the partition plate (21) is detachably connected to the side walls of the inner groove (18) by the side walls at both ends. Two partition plates (21) are provided and are located between the two filter plates (20). A vent hole (24) is provided through the partition plate (21), and the positions of the two vent holes (24) are opposite. A filling groove (23) is provided in the filter plate (20), and the filling groove (23) is filled with filter material. The filter hole sizes on the side walls of the three filter plates (20) gradually decrease from bottom to top. The side walls on both sides of the inner groove (18) are detachably inlaid with a disinfection lamp (22).

3. A return air filter device for subway air conditioning as claimed in claim 2, characterized in that: A wind tube (5) is detachably connected to the middle of the side wall of the central box (4) away from the sealing plate (3); an exhaust fan is rotatably connected inside the wind tube (5); a soft air duct (6) is detachably connected to one end of the wind tube (5) away from the central box (4); and the soft air duct (6) is detachably connected to the air duct of the air conditioner through the end thereof away from the wind tube (5).

4. A return air filter device for subway air conditioning as claimed in claim 1, characterized in that: A sealing rubber pad (17) is fixedly connected to a side wall of one side of the closing plate (9); the sealing rubber pad (17) is in contact with one end of the filter plate (20) and the spacer plate (21) via a side away from the closing plate (9); the sealing rubber pad (17) is a conical structure and its side wall is in contact with the inner wall of the opening of the concentration box (4).

5. The return air filter device for subway air conditioning according to claim 1, characterized in that: A locking stud (25) is inserted and connected through a thread in the middle of the fixing block (10), one end of the locking stud (25) is fixedly connected to a knob, one end of the locking stud (25) passes through the fixing block (10) and is rotatably connected to a push plate (26), a side wall of the push plate (26) away from the locking stud (25) is fixedly connected to an anti-skid pad (27), and the anti-skid pad (27) is fitted in the middle of the outer wall of the closing plate (9).

6. The return air filter device for subway air conditioning according to claim 1, characterized in that: A connecting block (28) is fixedly connected to a side wall at one end of the frame body (1); a slot (29) is provided at the bottom of the connecting block (28) and near the side walls at both ends; the sleeve (7) is rotatably connected to the side walls of the connecting block (28) at both sides that are away from each other through one end thereof; a rotation groove (33) is provided in the connecting block (28) and above the slot (29); the locking plate (11) passes through the slot (29) and is rotationally inserted into the rotation groove (33); a pressing plate (32) is fixedly connected to the bottom of the locking plate (11) and near the side walls at both ends; a top support plate (34) is fixedly connected to the bottom side wall of the rotation groove (33); the top support plate (34) and the pressing plate (32) are of relative trapezoidal structures; the bottom side wall of the connecting block (28) is in contact with the top side wall of the sealing plate (3).

7. A return air filter device for subway air conditioning as claimed in claim 6, characterized in that: The sealing plate (3) is provided with docking grooves (30) near both ends, a linkage column (31) is fixedly connected to the middle of the bottom side wall of the locking plate (11), one end of the linkage column (31) is inserted and rotatably connected in the docking groove (30), a groove (15) is provided at the bottom of the sealing plate (3) and at a position opposite to the docking groove (30), one end of the linkage column (31) passes through the bottom of the docking groove (30) and is laterally rotatably connected to a toggle plate (16), and the toggle plate (16) is a semicircular sheet structure.

8. The return air filter device for subway air conditioner according to claim 1, characterized in that: A connecting hole (12) is provided through the middle of the sealing plate (3); an adsorption mesh plate (13) is detachably embedded and connected inside the connecting hole (12); and filter holes are provided on the adsorption mesh plate (13); a grille (14) is detachably connected to the bottom opening of the connecting hole (12); a curling brush is fixed to the side wall of the adsorption mesh plate (13) opposite to the grille (14); and the connecting hole (12) is communicated with the interior of the concentration box (4).

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