A multi-chambered underground air delivery device and method

Abstract

The application provides a multi-chamber underground air conveying device and method, which comprises an air conveying mechanism, wherein the air conveying mechanism comprises a fan, a first pipe body, a second pipe body and a square pipe; an air outlet of the fan is communicated with the first pipe body, an air inlet of the fan is communicated with a second filtering mechanism, and the lower surface of the first pipe body is symmetrically communicated with two second pipe bodies; the first filtering mechanism is arranged below the ground, the first filtering mechanism below the ground can still perform secondary preliminary filtering after the second filtering mechanism performs preliminary filtering, dust impurities passing through the first filtering mechanism are filtered twice, and meanwhile, the HEPA high-efficiency filter screen and the activated carbon filter screen arranged below the ground can safely and effectively purify and adsorb harmful substances in the air, and ensure the personal safety and health of people living and working in the multi-chamber.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-chamber ventilation, and particularly relates to a multi-chamber underground air conveying device and an air conveying method. BACKGROUND

[0002] Underground engineering refers to underground civil engineering built for the development and utilization of underground space resources. It includes underground houses and underground structures, underground railways, highway tunnels, underwater tunnels, underground common trenches and underground passageways, etc.

[0003] With the rapid development of society, the construction direction of underground engineering is also more and more, such as subway, underground parking lot, etc. The underground engineering such as subway project is often a multi-chamber structure, and people work and live in the multi-chamber. Therefore, the air conveying of the multi-chamber underground engineering is particularly important.

[0004] In the prior art, the multi-chamber underground air conveying device is provided with a primary filter screen to remove dust and particles in the air, and is provided with a HEPA high-efficiency filter screen and an activated carbon filter plate to purify and adsorb harmful gases, so as to ensure that the air source input into the multi-chamber is clean and sanitary.

[0005] However, the air conveying device in the prior art has some problems in use.

[0006] The existing air conveying device is often installed on the ground to facilitate maintenance and repair. However, when the filter screen is damaged due to sudden conditions or human factors, the filter screen cannot play the expected filtering effect, especially when the HEPA high-efficiency filter screen and the activated carbon filter plate for purifying and adsorbing harmful gases are damaged due to external factors, which may cause air poisoning of people living and working in the multi-chamber underground.

[0007] If the air conveying device is simply installed underground where people cannot access, the filter screen plate in the air conveying device will not be intentionally or accidentally damaged, but the maintenance and repair work of the filter screen plate will be greatly inconvenient.

[0008] Therefore, the present application provides a multi-chamber underground air conveying device and an air conveying method. SUMMARY

[0009] Therefore, the present application provides a multi-chamber underground air conveying device and an air conveying method.

[0010] The technical scheme of the present application is as follows: a multi-chamber underground air conveying device, comprising:

[0011] The air conveying mechanism comprises a fan, a first pipe body, a second pipe body, and a square pipe.

[0012] The air outlet of the fan is communicated with the first pipe body, the air inlet of the fan is communicated with the second filter mechanism, the lower surface of the first pipe body is symmetrically communicated with two second pipe bodies, and the bottom end of the second pipe body is communicated with the square pipe.

[0013] The first filter mechanism is installed in the square pipe, the second filter mechanism is arranged above the ground, and the first filter mechanism is arranged below the ground.

[0014] And a transmission mechanism arranged below the ground is used for transmitting the movement of the first filter mechanism to above the ground.

[0015] Further preferably, the second filter mechanism comprises a first shell and a first primary filter screen, the first primary filter screen is fixedly connected to the inner side wall of the first shell through screws, and the first shell is communicated with the air outlet of the fan.

[0016] Further preferably, the air conveying mechanism further comprises a third pipe body and an exhaust pipe, the third pipe body is communicated with the bottom of the square pipe, and the exhaust pipe is communicated with the outer side of the second pipe body.

[0017] Further preferably, a first electromagnetic valve is installed on the outer side of the second pipe body, the exhaust pipe is located below the first electromagnetic valve, one end of the exhaust pipe is communicated with a collection box, a filter screen is fixedly connected in the collection box through screws, a first cover body is installed on the collection box, the first cover body is located on the ground, and a pipe body with a downward outlet is communicated with the first cover body.

[0018] Further preferably, the first filter mechanism comprises a second primary filter screen, a HEPA high-efficiency filter screen and an activated carbon filter screen.

[0019] A through slot is formed in one side of the bottom of the first filter mechanism, and two limiting holes are symmetrically formed in the through slot.

[0020] Further preferably, the transmission mechanism comprises a second shell, a third shell, a convex shell, a push-pull mechanism and a lead screw module.

[0021] The second shell is communicated with one side of the square pipe, the other side of the square pipe is communicated with one side of the third shell, the other side of the third shell is communicated with the convex shell, the push-pull mechanism for pushing and pulling the movement of the first filter mechanism is installed in the second shell, and the lead screw module for lifting the first filter mechanism is installed in the convex shell.

[0022] Further preferably, the push-pull mechanism comprises a cylinder, an L-shaped plate and limiting rods, the cylinder is installed in the interior of the second shell, the piston rod of the cylinder is fixedly connected with the L-shaped plate, the number of the limiting rods is two, the two limiting rods are fixedly connected on the L-shaped plate in a symmetrical mode, and the limiting rods are matched with the limiting holes.

[0023] Further preferably, the lead screw module comprises a motor, a lead screw and a bearing plate, the motor is installed in the interior of the convex-shaped shell, the output shaft of the motor is welded with the bottom end of the lead screw, the top end of the lead screw is rotationally connected to the top of the inner side wall of the convex-shaped shell through a bearing, and the outer side of the lead screw is screw-connected with the inner side of the bearing plate.

[0024] The application also provides a method suitable for multi-chamber underground air conveying, which comprises the following steps:

[0025] S1, opening a first electromagnetic valve, closing another first electromagnetic valve, starting a fan, external air is preliminarily filtered through a second filtering mechanism, then enters a second pipe body with the opened first electromagnetic valve, and then enters a square pipe;

[0026] S2, the first filtering mechanism in the square pipe performs secondary filtration on the air, purifies and adsorbs harmful substances in the air;

[0027] S3, the purified air enters a multi-chamber underground through a third pipe body, then the discharged air enters another square pipe through a third pipe body on the other side, and the first filtering mechanism in the other square pipe is cleaned of impurities;

[0028] S4, the cleaned impurities enter an exhaust pipe, then fall into a collecting box, and finally the discharged air leaves through a pipe body with an opening facing downward.

[0029] Further preferably, when the first filtering mechanism is overhauled, the following steps are further included:

[0030] S5, the cylinder is started, the piston rod of the cylinder pushes the L-shaped plate, the L-shaped plate pushes the first filtering mechanism into the interior of the third shell through the limiting rods, and then into the interior of the convex-shaped shell;

[0031] S6, the motor is started, the output shaft of the motor drives the lead screw to rotate clockwise, the bearing plate connected through transmission threads moves upward, and the first filtering mechanism is driven by the bearing plate to move upward;

[0032] S7, the first filtering mechanism is taken out by a worker for overhauling and replacing;

[0033] S8, the overhauled and replaced first filtering mechanism is placed on the bearing plate;

[0034] S9, the output shaft of the motor drives the screw rod to rotate counterclockwise, the bearing plate connected by transmission screw moves downward, and the first filtering mechanism is driven by the bearing plate to move downward;

[0035] S10, when the first filtering mechanism moves to the position where the limiting hole and the abutting part of the limiting rod coincide, the first filtering mechanism stops moving downward;

[0036] S11, the piston rod of the cylinder retracts, and drives the first filtering mechanism to return to the original position.

[0037] The embodiment of the application has the following advantages due to the adoption of the above technical scheme:

[0038] I. By setting the first prefiltering net above the ground, the air from the outside is preliminarily filtered through the first prefiltering net. Since the first prefiltering net is the first process for filtering dust and impurities, and the first prefiltering net needs to be maintained frequently, the first prefiltering net is set above the ground, which is convenient for maintenance.

[0039] II. The first filtering mechanism is set below the ground. After the second filtering mechanism preliminarily filters, the first filtering mechanism below the ground can still perform the second preliminary filtering, and the dust and impurities passing through the first filtering mechanism are filtered twice. Meanwhile, the HEPA high-efficiency filter net and the activated carbon filter net set below the ground can safely and effectively purify and adsorb harmful substances in the air, ensuring the personal safety and health of people living and working in the multi-chamber.

[0040] After the first prefiltering net is taken out for inspection and maintenance, the second prefiltering net can still filter dust and particles in the air, so that the air supply device can still maintain air supply work, ensuring uninterrupted air supply in the multi-chamber.

[0041] III. By setting the first electromagnetic valve, by closing one first electromagnetic valve and opening another first electromagnetic valve, the direction of air flow can be controlled, so that the air entering the multi-chamber can leave through the exhaust pipe after leaving, and the impurities in the first filtering mechanism can be removed during the leaving process, reducing the maintenance interval of the first filtering mechanism and the labor frequency of the workers.

[0042] IV. By setting the removed impurities into the exhaust pipe, then falling into the collection box, and finally the discharged air leaving through the downward opening pipe, the impurities can be uniformly recycled and treated, avoiding pollution of the surrounding environment and being more environmentally friendly.

[0043] Fifth, by setting up a push-pull mechanism, the present invention can push the first filter mechanism that needs to be repaired or replaced into the convex-shaped housing, and then transport the first filter mechanism to the ground through the screw module for repair or replacement. The operation is convenient and reduces the difficulty of the work of the staff while ensuring safety and effectiveness. At the same time, the first filter mechanism after repair or replacement can also return to its original position through the screw module and the push-pull mechanism, making it convenient to use.

[0044] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a structural schematic diagram from one perspective of the present invention;

[0047] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0048] Figure 3 This is a schematic diagram of the overall structure of the air supply device of the present invention;

[0049] Figure 4 This is a top view of the air supply device of the present invention after removing the fan and the first pipe body;

[0050] Figure 5 For the present invention Figure 4 A schematic diagram of the AA cross-sectional three-dimensional structure;

[0051] Figure 6 For the present invention Figure 4 Schematic diagram of the BB cross-section three-dimensional structure;

[0052] Figure 7 This is a schematic diagram of the square tube structure of the present invention;

[0053] Figure 8 This is a schematic diagram of the structure of the first filtration mechanism 241 of the present invention;

[0054] Figure 9 This is a schematic diagram of the connection mechanism between the second housing, the square tube, and the third housing of the present invention;

[0055] Figure 10 Structure diagram of the push-pull mechanism of the present application;

[0056] Figure 11 Structure diagram of the connection between the L-shaped plate and the first filtering mechanism of the present application;

[0057] Figure 12 Structure diagram of the convex-shaped shell of the present application;

[0058] Figure 13 Structure diagram of the lead screw module of the present application;

[0059] Figure 14 Structure diagram of the collection box of the present application.

[0060] Reference signs: 1, ground; 2, air conveying mechanism; 21, fan; 22, first pipe body; 23, second pipe body; 231, first electromagnetic valve; 24, square pipe; 241, first filtering mechanism; 2411, through slot; 2412, limiting hole; 25, third pipe body; 26, air exhaust pipe; 261, collection box; 262, filter screen; 3, second filtering mechanism; 31, first shell; 32, first primary filter screen; 4, transmission mechanism; 41, second shell; 42, third shell; 43, convex-shaped shell; 44, push-pull mechanism; 441, air cylinder; 442, L-shaped plate; 443, limiting rod; 45, lead screw module; 451, motor; 452, lead screw; 453, bearing plate. DETAILED DESCRIPTION

[0061] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the present application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0062] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0063] As Figures 1-14 shown, the embodiments of the present application provide a multi-chamber underground air conveying device, which comprises:

[0064] The air conveying mechanism 2 comprises a fan 21, a first pipe body 22, a second pipe body 23, and a square pipe 24.

[0065] The air outlet of the fan 21 is in communication with the first pipe body 22, the air inlet of the fan 21 is in communication with the second filtering mechanism 3, the lower surface of the first pipe body 22 is symmetrically connected with two second pipe bodies 23, and the bottom end of the second pipe body 23 is connected with the square pipe 24.

[0066] The first filtering mechanism 241 is arranged inside the square tube 24, the second filtering mechanism 3 is arranged above the ground 1, and the first filtering mechanism 241 is arranged below the ground 1.

[0067] The transmission mechanism 4 is arranged below the ground 1 and is used for transmitting the movement of the first filtering mechanism 241 to the ground 1.

[0068] In the embodiment, specifically, the second filtering mechanism 3 comprises a first shell 31 and a first primary filter screen 32, the first primary filter screen 32 is fixedly connected to the inner side wall of the first shell 31 by screws, the first shell 31 is in communication with the air outlet of the fan 21, and the air outside the air conditioner is preliminarily filtered by the first primary filter screen 32. Since the first primary filter screen 32 is the first process for filtering dust and impurities, and the first primary filter screen 32 needs to be maintained frequently, the first primary filter screen 32 is arranged above the ground 1, thereby facilitating maintenance.

[0069] In the embodiment, specifically, the air conveying mechanism 2 further comprises a third tube body 25 and an exhaust pipe 26, the third tube body 25 is in communication with the bottom of the square tube 24, and the exhaust pipe 26 is in communication with the outer side of the second tube body 23, thereby limiting the flow direction of the air outside the air conditioner.

[0070] In the embodiment, specifically, the first electromagnetic valve 231 is arranged on the outer side of the second tube body 23, the exhaust pipe 26 is located below the first electromagnetic valve 231, one end of the exhaust pipe 26 is in communication with a collecting box 261, the inside of the collecting box 261 is fixedly connected with a filter screen 262 by screws, a first cover body is arranged on the collecting box 261, the first cover body is located above the ground 1, the first cover body is in communication with a pipe body with an outlet downward, the air purified by the first filtering mechanism 241 enters the underground multi-chamber through the third tube body 25, then the air discharged through the other third tube body 25 enters another square tube 24, thereby removing impurities in the first filtering mechanism 241 of the other square tube 24, the removed impurities fall into the collecting box 261, and finally the air discharged through the pipe body with an outlet downward is discharged, thereby preventing dust and particulate impurities outside the air conditioner from entering the collecting box 261 along the pipe body.

[0071] In the embodiment, specifically, the first filtering mechanism 241 comprises a second primary filter screen, a HEPA high-efficiency filter screen and an activated carbon filter screen.

[0072] A through slot 2411 is formed on the bottom side of the first filtering mechanism 241, and two limiting holes 2412 are symmetrically formed in the through slot 2411. Through the above arrangement, the first filtering mechanism 241 under the ground 1 can still be subjected to a second preliminary filtration after the second filtering mechanism 3 performs a preliminary filtration. The dust and impurities passing through the first filtering mechanism 241 are subjected to a second filtration. At the same time, the HEPA high-efficiency filter screen and the activated carbon filter screen arranged under the ground 1 can safely and effectively purify and adsorb harmful substances in the air, thereby ensuring the personal safety and health of people living and working in multiple rooms.

[0073] In this embodiment, specifically: the transmission mechanism 4 includes a second housing 41, a third housing 42, a convex-shaped housing 43, a push-pull mechanism 44, and a lead screw module 45.

[0074] The second housing 41 is connected to one side of the square tube 24, the other side of the square tube 24 is connected to one side of the third housing 42, the other side of the third housing 42 is connected to the convex-shaped housing 43, the inside of the second housing 41 is installed with the push-pull mechanism 44 for pushing and pulling the first filtering mechanism 241 to move, and the inside of the convex-shaped housing 43 is installed with the lead screw module 45 for lifting the first filtering mechanism 241.

[0075] Through the above arrangement, the push-pull mechanism 44 can push the first filtering mechanism 241 into the third housing 42, and then into the convex-shaped housing 43. Subsequently, the first filtering mechanism 241 is transported to the ground 1 by the lead screw module 45, which facilitates the removal of the first filtering mechanism 241 by the staff for maintenance and replacement work.

[0076] In this embodiment, specifically: the push-pull mechanism 44 includes a cylinder 441, an L-shaped plate 442, and a limiting rod 443. The cylinder 441 is installed in the inside of the second housing 41. The piston rod of the cylinder 441 is fixedly connected with the L-shaped plate 442. The number of the limiting rods 443 is two. The two limiting rods 443 are symmetrically fixedly connected on the L-shaped plate 442. The limiting rods 443 are matched with the limiting holes 2412. The cylinder 441 provides power. The piston rod of the cylinder 441 can drive the L-shaped plate 442 to move.

[0077] In this embodiment, specifically: the lead screw module 45 includes a motor 451, a lead screw 452, and a bearing plate 453. The motor 451 is installed in the inside of the convex-shaped housing 43. The output shaft of the motor 451 is welded with the bottom end of the lead screw 452. The top end of the lead screw 452 is rotatably connected with the top of the inner side wall of the convex-shaped housing 43 through a bearing. The outer side of the lead screw 452 is threadedly connected with the inner side of the bearing plate 453. The output shaft of the motor 451 rotates to drive the bearing plate 453 to move up and down.

[0078] In this embodiment, the outer side edge of the first filtering mechanism 241 is wrapped with a piston sleeve for sealing the connection between the square tube 24 and the second housing 41 and the third housing 42.

[0079] In this embodiment, the outer side of the third tube body 25 is provided with a second electromagnetic valve.

[0080] The application also provides a method for air supply in a multi-chamber underground space, comprising the following steps:

[0081] S1, opening one first electromagnetic valve 231, closing another first electromagnetic valve 231, starting the fan 21, and externally air is preliminarily filtered by the second filtering mechanism 3, then enters the second tube body 23 with the opened first electromagnetic valve 231, and then enters the square tube 24;

[0082] S2, the first filtering mechanism 241 inside the square tube 24 performs secondary filtration on the air, purifies and adsorbs harmful substances in the air;

[0083] S3, the purified air enters the underground multi-chamber through the third tube body 25, and then the discharged air enters another square tube 24 through the third tube body 25 on the other side to remove impurities from the first filtering mechanism 241 inside the other square tube 24;

[0084] S4, the removed impurities enter the exhaust tube 26, then fall into the collection box 261, and finally the discharged air leaves through the downwardly open tube.

[0085] When the first filtering mechanism 241 is overhauled, the following steps are further included:

[0086] S5, the air cylinder 441 is started, the piston rod of the air cylinder 441 pushes the L-shaped plate 442, the L-shaped plate 442 pushes the first filtering mechanism 241 into the third housing 42 through the limiting rod 443, and then into the convex-shaped housing 43;

[0087] S6, the motor 451 is started, the output shaft of the motor 451 drives the lead screw 452 to rotate clockwise, the bearing plate 453 connected by transmission screw is moved upward, and the bearing plate 453 drives the first filtering mechanism 241 to move upward;

[0088] S7, the staff takes out the first filtering mechanism 241 for overhaul and replacement;

[0089] S8, the overhauled and replaced first filtering mechanism 241 is placed on the bearing plate 453;

[0090] S9, the output shaft of the motor 451 drives the lead screw 452 to rotate counterclockwise, the bearing plate 453 connected by transmission screw is moved downward, and the bearing plate 453 drives the first filtering mechanism 241 to move downward.

[0091] S10, when the first filtering mechanism 241 moves to the abutment position of the limiting hole 2412 and the limiting rod 443, the first filtering mechanism 241 stops moving downward;

[0092] S11, the piston rod of the air cylinder 441 is retracted, and the first filtering mechanism 241 is driven to return to the original position.

[0093] In the working process of the present application: by setting the first primary filter screen 32 above the ground 1, the air outside is preliminarily filtered through the first primary filter screen 32, since the first primary filter screen 32 is the first process for filtering dust and impurities, and the first primary filter screen 32 needs to be maintained frequently, therefore, the first primary filter screen 32 is set above the ground 1, which is convenient for maintenance;

[0094] The first filtering mechanism 241 is arranged below the ground 1, which can still perform the second preliminary filtration after the second filtering mechanism 3 performs the preliminary filtration, and the dust and impurities passing through the first filtering mechanism 241 are filtered twice, at the same time, the HEPA high-efficiency filter screen and the activated carbon filter screen arranged below the ground 1 can safely and effectively purify and adsorb harmful substances in the air, ensure the personal safety and health of people living and working in multiple rooms, and after the first primary filter screen 32 is taken out for maintenance, the second primary filter screen can still filter dust and particles in the air, so that the air supply device can still maintain air supply work, and ensure uninterrupted air supply in multiple underground rooms;

[0095] By arranging the first electromagnetic valve 231, by closing one first electromagnetic valve 231 and opening another first electromagnetic valve 231, the direction of air flow can be controlled, so that the air entering the multiple rooms can leave through the exhaust pipe 26 after leaving, and in the process of leaving, the impurities in the first filtering mechanism 241 are removed, which reduces the maintenance time interval of the first filtering mechanism 241 and reduces the labor frequency of the workers;

[0096] By arranging the impurities removed into the exhaust pipe 26, then falling into the collection box 261, and finally the air discharged through the open downward pipe body, the impurities can be uniformly recycled and treated, avoiding pollution of the surrounding environment and being more environmentally friendly;

[0097] The first filter mechanism 241 which needs to be overhauled or replaced can be pushed into the convex-shaped shell 43 through the push-pull mechanism 44, and then the first filter mechanism 241 can be transported to the ground through the lead screw module 45 to be overhauled or replaced, so that the operation is convenient, the work difficulty of the workers is reduced under the premise of ensuring safety and effectiveness, and the first filter mechanism 241 after being overhauled or replaced can also return to the original position through the lead screw module 45 and the push-pull mechanism 44, so that the use is convenient.

[0098] The above merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various changes or replacements within the technical range disclosed by the present application, and these should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-cavity underground air supply device, characterized in that, include: Air supply mechanism (2), the air supply mechanism (2) includes a fan (21), a first pipe body (22), a second pipe body (23), and a square pipe (24); The air outlet of the fan (21) is connected to the first pipe body (22), the air inlet of the fan (21) is connected to the second filter mechanism (3), the lower surface of the first pipe body (22) is symmetrically connected to two second pipe bodies (23), and the bottom end of the second pipe body (23) is connected to a square tube (24). The square tube (24) is equipped with a first filter mechanism (241), the second filter mechanism (3) is located above the ground (1), the first filter mechanism (241) is located below the ground (1); and a transmission mechanism (4) is located below the ground (1) for transporting the first filter mechanism (241) to the ground (1). The air supply mechanism (2) also includes a third pipe (25) and an exhaust pipe (26), the third pipe (25) being connected to the bottom of the square pipe (24), and the exhaust pipe (26) being connected to the outside of the second pipe (23); A first solenoid valve (231) is installed on the outside of the second pipe (23). The exhaust pipe (26) is located below the first solenoid valve (231). One end of the exhaust pipe (26) is connected to a collection box (261). A filter screen (262) is fixedly connected inside the collection box (261) by screws. A first cover is installed on the collection box (261). The first cover is located on the ground (1). A pipe with an outlet facing downwards is connected to the first cover.

2. The underground ventilation system suitable for multi-chamber installations according to claim 1, characterized in that: The second filtration mechanism (3) includes a first housing (31) and a first primary filter (32). The first primary filter (32) is fixedly connected to the inner wall of the first housing (31) by screws. The first housing (31) is connected to the air outlet of the fan (21).

3. A multi-chamber underground ventilation system according to claim 2, characterized in that: The first filtration mechanism (241) includes a second pre-filter, a HEPA high-efficiency filter, and an activated carbon filter; The first filter mechanism (241) has a through groove (2411) on one side of its bottom, and two limiting holes (2412) are symmetrically opened in the through groove (2411).

4. A multi-cavity underground ventilation system according to claim 3, characterized in that: The transmission mechanism (4) includes a second housing (41), a third housing (42), a U-shaped housing (43), a push-pull mechanism (44), and a lead screw module (45); The second housing (41) is connected to one side of the square tube (24), the other side of the square tube (24) is connected to one side of the third housing (42), the other side of the third housing (42) is connected to the U-shaped housing (43), the second housing (41) is equipped with a push-pull mechanism (44) for pushing and pulling the first filter mechanism (241), and the U-shaped housing (43) is equipped with a screw module (45) for raising and lowering the first filter mechanism (241).

5. A multi-chamber underground ventilation system according to claim 4, characterized in that: The push-pull mechanism (44) includes a cylinder (441), an L-shaped plate (442), and a limiting rod (443). The cylinder (441) is installed inside the second housing (41). The piston rod of the cylinder (441) is fixedly connected to the L-shaped plate (442). There are two limiting rods (443). The two limiting rods (443) are symmetrically fixedly connected to the L-shaped plate (442). The limiting rods (443) are adapted to the limiting hole (2412).

6. A multi-cavity underground ventilation system according to claim 5, characterized in that: The lead screw module (45) includes a motor (451), a lead screw (452), and a support plate (453). The motor (451) is installed inside the U-shaped housing (43). The output shaft of the motor (451) is welded to the bottom end of the lead screw (452). The top end of the lead screw (452) is rotatably connected to the top of the inner wall of the U-shaped housing (43) through a bearing. The outer side of the lead screw (452) is threadedly connected to the inner side of the support plate (453).

7. A method for underground air supply in multi-cavity structures, using the underground air supply device for multi-cavity structures as described in claim 6, characterized in that, Includes the following steps: S1. Open one first solenoid valve (231), close the other first solenoid valve (231), start the fan (21), and the outside air is initially filtered through the second filter mechanism (3), then enters the second pipe body (23) with the first solenoid valve (231) opened through the first pipe body (22), and then enters the square pipe (24); S2, The first filter mechanism (241) inside the square tube (24) performs secondary filtration of the air, purifying and adsorbing harmful substances in the air; S3. The purified air enters the underground multi-cavity chamber through the third pipe (25), and the exhaust air enters another square pipe (24) through the third pipe (25) on the other side to remove impurities from the first filter mechanism (241) inside the other square pipe (24). S4. The removed impurities enter the exhaust pipe (26) and then fall into the collection box (261). Finally, the exhaust air leaves through the pipe with the opening facing downwards.

8. A method for underground air supply in multi-cavity underground spaces according to claim 7, characterized in that: When performing maintenance work on the first filter mechanism (241), the following steps are also included: S5. The cylinder (441) starts, and the piston rod of the cylinder (441) pushes the L-shaped plate (442). The L-shaped plate (442) passes through the limiting rod. (443) Push the first filter mechanism (241) into the third housing (42), and then into the convex housing (43); S6. The motor (451) starts, and the output shaft of the motor (451) drives the lead screw (452) to rotate clockwise. The bearing plate (453) connected by the transmission thread moves upward, and the bearing plate (453) drives the first filter mechanism (241) to move upward. S7. The staff took out the first filter unit (241) and carried out maintenance and replacement work. S8. The first filter unit (241) after inspection and replacement is placed on the support plate (453); S9. The output shaft of the motor (451) drives the lead screw (452) to rotate counterclockwise, and the bearing plate (453) connected by the transmission thread moves downward. The bearing plate (453) drives the first filter mechanism (241) to move downward. S10. When the first filter mechanism (241) moves to the part where the limiting hole (2412) and the limiting rod (443) match, the first filter mechanism (241) stops moving downward. S11, the piston rod of the cylinder (441) retracts, driving the first filter mechanism (241) back to its original position.

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