Air purification device for tunnel

Abstract

The invention provides an air purification device for a tunnel, and relates to the technical field of tunnel gas purification, the air purification device comprises a tunnel body, a reflector is fixedly connected to the inner wall of the top of the tunnel body, and a light emitter is arranged on the inner wall of one side of the tunnel body. The device is composed of a light source, an optical system, a photoelectric detector and a signal processing circuit part, the light source generally adopts laser or an LED lamp, the optical system comprises a focusing lens, a diaphragm and a spectroscope and is used for focusing light on particles and collecting scattered light, the photoelectric detector converts the scattered light into an electric signal, and the electric signal is transmitted to the signal processing circuit part. The signal processing circuit carries out amplification, filtering and analog-to-digital conversion processing on the electric signals, finally, the numerical value of the particulate matter concentration is obtained, compared with a traditional small micro station, the monitoring numerical value of the monitoring device has higher accuracy, and large-scale arrangement and installation at the entrance and exit of the tunnel and in the tunnel are facilitated for government supervision departments.

Description

Technical Field

[0001] The invention relates to the field of tunnel gas purification technology processing, and in particular to an air purification device for tunnels. Background Art

[0002] Tunnels are engineering structures buried in the ground, and are a form of human use of underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mining tunnels, and military tunnels. Because they are not restricted by terrain conditions, they have been vigorously promoted in mountainous areas with the advancement of construction technology. However, during the construction of tunnels, due to the geological conditions of the construction, various harmful gases are contained in the strata of the tunnel and the cracks in the surrounding rocks during the excavation process. Harmful gases are one of the major risk factors that directly affect the construction of tunnel projects and endanger construction safety. If a catastrophic accident occurs, it will cause a large number of casualties, and in severe cases, it will even destroy the built project.

[0003] The existing tunnel air quality monitoring device has a complicated process for monitoring the air inside the tunnel, and the monitoring results are not accurate enough. It cannot be deployed on a large scale and installed at each tunnel entrance, which is not convenient for government regulatory departments to deploy and install on a large scale at tunnel entrances and exits and inside the tunnel. In addition, the existing air quality monitoring device cannot promptly process and purify the nearby gas after detecting excessive gas, which will cause great harm to the health of construction workers. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides an air purification device for a tunnel, which solves the problems raised by the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an air purification device for a tunnel, comprising a tunnel body, a reflector fixedly connected to the top inner wall of the tunnel body, a light emitter provided on the inner wall of one side of the tunnel body, a receiver fixedly connected to the other side of the tunnel body, a purifier body shell provided inside the tunnel body, a fixed tripod installed at the bottom of the purifier body shell, and the bottoms of multiple fixed tripods fixedly connected to the bottom inner wall of the tunnel body.

[0006] Preferably, an exhaust duct is installed on the top of the purifier body shell, an air intake duct is installed at the bottom and in the middle of the purifier body shell, a positioning bracket is installed on the bottom inner wall of the purifier body shell and at a position outside the air intake duct, an inner support cylinder is installed on the top of the positioning bracket, a diffusion cone is installed on the bottom of the inner support cylinder through the bracket, a bottom filter plate is installed at the bottom of the inner support cylinder and at a position close to the outside, a water accumulation plate is installed on the outside of the bottom filter plate, and an inner partition cylinder is installed on the outside of the water accumulation plate.

[0007] Preferably, the top of the inner dividing cylinder is installed with the top inner wall of the purifier body shell, and a pollution drain pipe is installed on the outer wall of the inner dividing cylinder and located above the water accumulation plate, and the outer end of the pollution drain pipe penetrates the purifier body shell and extends to the outside of the purifier body shell, and a side groove is provided on the outer wall of the inner supporting cylinder, and an upper guide cone is installed on the bottom inner wall of the side groove, and a positioning rod is movably inserted on the top of the upper guide cone, and a motor is installed on the top inner wall of the inner supporting cylinder, and a limiting sleeve is installed on the output end of the motor, and a limiting clamping rod is provided on the inner wall of the limiting sleeve, and a limiting clamping groove is provided on the outer wall of the positioning rod and located near the top.

[0008] Preferably, the limiting card rod is inserted into the limiting card slot, a side spray assembly is provided inside the inner support cylinder, a filtering and purification device is provided outside the inner support cylinder, a top annular mounting tube body is installed on the inner inner wall of the purifier body shell through a bracket, a top spray head is installed at the bottom of the top annular mounting tube body, a water supply pipe is installed on the inner side of the top annular mounting tube body, the bottom end of the water supply pipe passes through the inner support cylinder, the inner support cylinder is connected to the annular pipe seat, and the lower end of the inner support cylinder passes through the purifier body shell backwards and extends to the rear side of the purifier body shell.

[0009] Preferably, the side spray assembly includes: an annular tube seat, a rotating sleeve, a side spray head, a limiting gear and a limiting gear ring. The interior of the inner support cylinder is equipped with an annular tube seat through a bracket, the outer wall of the annular tube seat is equipped with a rotating sleeve, the side spray head is installed on the surface of the rotating sleeve and located near the outside, the outer wall of the rotating sleeve is equipped with a limiting gear and located near the inside, and the limiting gear ring is opened on the outer surface of the positioning rod.

[0010] Preferably, the filtering and purification device includes a cross bracket, an inner snap ring seat, an inner support frame, a filter mesh plate, a vertical partition filter plate, an outer support frame, a water guide groove, an annular water sump and a clean drain pipe, the cross bracket is installed with the outer wall of the positioning rod, the inner snap ring seat is movably connected to the outer side of the inner supporting cylinder, the outer end of the cross bracket is installed with the inner wall of the inner snap ring seat, the inner support frame is installed with the outer wall of the inner snap ring seat, the filter mesh plate is installed with the outer wall of the inner support frame, the vertical partition filter plate is installed with the top of the filter mesh plate, the outer support frame is installed with the outer wall of the filter mesh plate, the water guide groove is installed on the outer side of the outer support frame, the annular water sump is installed with the inner wall of the inner partition cylinder and at a position below the water guide groove, the clean drain pipe is installed with the outer wall of the annular water sump, and the clean drain pipe passes through the inner partition cylinder and the purifier body shell and extends to the outside of the purifier body shell.

[0011] Preferably, the bottom filter plate and the water accumulation plate form an inverted bucket shape, and the inner side of the water accumulation plate extends to the bottom of the filter mesh plate.

[0012] Preferably, the inner support frame, the filter screen plate, the outer support frame and the water guide groove are all spiral-shaped, and the inner end of the water guide groove is higher than the top of the outer support frame.

[0013] Preferably, the vertical partition filter plate is arc-shaped, and the clockwise side of the vertical partition filter plate is bent inward.

[0014] Preferably, the limit slot is an oblique annular slot, and the height of the limit slot on the left side is higher than the height on the right side, and the end of the bottom end of the positioning rod connected to the upper guide cone is square, the filter hole of the bottom filter plate is larger than the filter hole of the filter mesh plate, and the inner side edge of the lower end of the filter mesh plate is higher than the outer side edge.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention is mainly composed of a light source, an optical system, a photodetector and a signal processing circuit. The light source is usually a laser or LED lamp, and the optical system includes a focusing lens, an aperture, and a spectroscope, which are used to focus the light on the particles and collect scattered light. The photodetector converts the scattered light into an electrical signal, and the signal processing circuit amplifies, filters, and performs analog-to-digital conversion on the electrical signal to finally obtain the numerical value of the particle concentration. Compared with traditional small and micro stations, the monitoring values ​​of the monitoring device of the present invention have higher accuracy, which is convenient for government regulatory departments to deploy and install on a large scale at the entrances and exits of tunnels and inside tunnels.

[0016] 2. The present invention uses a spirally designed filter screen to change the flow trajectory of the excessive gas into a spiral shape, thereby increasing the distance the excessive gas flows, thereby increasing the purification time of the excessive gas, increasing the contact time between the excessive gas and the water mist sprayed laterally, and improving the purification effect of the excessive gas.

[0017] 3. During the purification process of the present invention, the side nozzles are continuously deflected up and down to spray water mist on the inside of the filter screen from the inside to the outside. The gas exceeding the standard is fully mixed with the water mist by spraying at multiple angles. The impurity particles in the gas exceeding the standard are adsorbed, filtered and precipitated by the water mist. The top nozzle sprays water downward, and the water flows in contact with the surface of the filter screen to form a water film on the surface of the filter screen. The gas exceeding the standard comes into contact with the water film during the process of flowing upward along the inside of the filter screen, thereby improving the contact effect between the gas exceeding the standard and water, thereby improving the adsorption and filtration effect.

[0018] 4. During the filtration process of the present invention, the inner retaining ring seat drives the filter screen to move up and down repeatedly through the inner support frame. During the up and down movement of the filter screen, the gas inside the cavity separated by the filter screen will be pressed, so that the gas contacts the upper and lower surfaces of the filter screen, thereby further improving the contact effect between the excessive gas and the water film on the surface of the filter screen, and improving the adsorption effect of the filter screen on impurities.

[0019] 5. The water adsorbed on the surface of the filter screen of the present invention flows outward to the top of the outer support frame under the action of centrifugal force, and the water is initially precipitated above the outer support frame. Impurities are precipitated at the bottom of the outer support frame. The water near the top will pass through the obstruction of the water guide groove and enter the interior of the water guide groove and flow downward. The water containing more impurities flows downward along the top of the outer support frame. By preliminarily sorting the wastewater used for adsorption and filtration, it is convenient to purify the wastewater and then recycle it. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at center; Figure 4 For the present invention Figure 2 A magnified view of the structure at B in the middle; Figure 5 For the present invention Figure 2 A magnified view of the structure at C in the middle; Figure 6 For the present invention Figure 2 A magnified view of the structure at D in the middle; Figure 7 This is a schematic diagram of the internal structure of the inner partition cylinder of the present invention; Figure 8 It is a schematic diagram of the overall structural distribution of the present invention.

[0021] In the figure: 1. Purifier body shell; 2. Fixed stand; 3. Inlet pipe; 4. Exhaust pipe; 5. Positioning bracket; 6. Inner support cylinder; 7. Diffusion cone; 8. Bottom filter plate; 9. Water accumulation plate; 10. Inner separation cylinder; 11. Polluted drain pipe; 12. Side groove; 13. Upper guide cone; 14. Positioning plug rod; 15. Motor; 16. Limit sleeve; 17. Limit clamp rod; 18. Limit clamp slot; 19. Ring pipe seat; 20. Rotating sleeve; 21 , side nozzle; 22, limit gear; 23, limit gear ring; 24, horizontal bracket; 25, inner clamping ring seat; 26, inner support frame; 27, filter screen plate; 28, vertical partition filter plate; 29, outer support frame; 30, water guide groove; 31, annular water trough; 32, clean drainage pipe; 33, water supply pipe; 34, top annular installation pipe body; 35, top nozzle; 36, reflector; 37, tunnel body; 38, receiver; 39, light transmitter. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 as well as Figure 8 , the present invention provides a technical solution: An air purification device for a tunnel, comprising a tunnel body 37, a reflector 36 fixedly connected to the top inner wall of the tunnel body 37, a light emitter 39 arranged on the inner wall of one side of the tunnel body 37, a receiver 38 fixedly connected to the other side of the tunnel body 37, a purifier body shell 1 arranged inside the tunnel body 37, a fixed stand 2 installed at the bottom of the purifier body shell 1, the bottoms of the multiple fixed stands 2 fixedly connected to the bottom inner wall of the tunnel body 37, an exhaust pipe 4 installed at the top of the purifier body shell 1, and the purifier body shell 1 is provided at the bottom and in the middle of the air inlet pipe 3, a positioning bracket 5 is provided at the bottom inner wall of the purifier body shell 1 and at the outside of the air inlet pipe 3, an inner support cylinder 6 is provided at the top of the positioning bracket 5, a diffusion cone 7 is provided at the bottom of the inner support cylinder 6 through the bracket, a bottom filter plate 8 is provided at the bottom of the inner support cylinder 6 and at the outside, a water accumulation plate 9 is provided at the outside of the bottom filter plate 8, an inner partition cylinder 10 is provided at the outside of the water accumulation plate 9, the top of the inner partition cylinder 10 is provided at the top inner wall of the purifier body shell 1, and the outer wall of the inner partition cylinder 10 is provided at the water accumulation plate 9 A polluted drainage pipe 11 is installed at the upper position, and the outer end of the polluted drainage pipe 11 passes through the purifier body shell 1 and extends to the outside of the purifier body shell 1, the outer wall of the inner support cylinder 6 is provided with a side groove 12, and the bottom inner wall of the side groove 12 is provided with an upper guide cone 13, and the top of the upper guide cone 13 is movably plugged with a positioning plug 14, and a motor 15 is installed on the top inner wall of the inner support cylinder 6, and a limiting sleeve 16 is installed at the output end of the motor 15, and a limiting card rod 17 is provided on the inner wall of the limiting sleeve 16, and a limiting card slot 18 is provided on the outer wall of the positioning plug rod 14 and located near the top. The rod 17 is inserted into the inner limit slot 18, a side spray assembly is arranged inside the inner support cylinder 6, a filtering and purifying device is arranged outside the inner support cylinder 6, a top annular mounting tube 34 is installed on the inner wall of the purifier body shell 1 through a bracket, a top spray head 35 is installed at the bottom of the top annular mounting tube 34, a water supply pipe 33 is installed on the inner side of the top annular mounting tube 34, the bottom end of the water supply pipe 33 passes through the inner support cylinder 6, the inner support cylinder 6 is connected with the annular pipe seat 19, and the lower end of the inner support cylinder 6 passes through the purifier body shell 1 backward and extends to the rear side of the purifier body shell 1; The side spray assembly includes: an annular tube seat 19, a rotating sleeve 20, a side spray head 21, a limit gear 22 and a limit gear ring 23. The inner support cylinder 6 is provided with an annular tube seat 19 through a bracket, the outer wall of the annular tube seat 19 is provided with a rotating sleeve 20, the surface of the rotating sleeve 20 is provided with a side spray head 21 at a position close to the outside, the outer wall of the rotating sleeve 20 is provided with a limit gear 22 at a position close to the inside, and the limit gear ring 23 is provided on the outer surface of the positioning rod 14; The filtering and purification device includes a horizontal bracket 24, an inner snap ring seat 25, an inner support frame 26, a filter screen plate 27, a vertical partition filter plate 28, an outer support frame 29, a water guide groove 30, an annular water sump 31 and a clean drain pipe 32. The horizontal bracket 24 is installed with the outer wall of the positioning plug rod 14, the inner snap ring seat 25 is movably connected to the outer side of the inner support cylinder 6, the outer end of the horizontal bracket 24 is installed with the inner wall of the inner snap ring seat 25, the inner support frame 26 is installed with the outer wall of the inner snap ring seat 25, the filter screen plate 27 is installed with the inner The outer wall of the support frame 26 is installed, the vertical partition filter plate 28 is installed on the top of the filter mesh plate 27, the outer support frame 29 is installed on the outer wall of the filter mesh plate 27, the water guide groove 30 is installed on the outer side of the outer support frame 29, the annular water sump 31 is installed on the inner wall of the inner partition cylinder 10 and is located below the water guide groove 30, the clean drain pipe 32 is installed on the outer wall of the annular water sump 31, and the clean drain pipe 32 passes through the inner partition cylinder 10 and the purifier body shell 1 and extends to the outside of the purifier body shell 1.

[0024] In the present embodiment, it should also be noted that the bottom filter plate 8 and the water accumulation plate 9 form an inverted bucket shape, and the inner side of the water accumulation plate 9 extends to the bottom of the filter screen plate 27 .

[0025] Specifically, the water on the surface of the water accumulation plate 9 will be gathered to the outside, and then discharged outward along the pollution drainage pipe 11.

[0026] In this embodiment, it should also be noted that the inner support frame 26, the filter screen plate 27, the outer support frame 29 and the water guide groove 30 are all spiral-shaped.

[0027] Specifically, the cavity where the excessive gas flows is divided into a spiral shape by the filter plate 27, thereby increasing the distance required for the excessive gas to pass through, and the gas can be pressed by moving the filter plate 27 up and down, so that the gas contacts the surface of the filter plate 27.

[0028] In this embodiment, it should also be noted that the inner end of the water guide groove 30 is higher than the top of the outer support frame 29 .

[0029] Specifically, when water is gathered at a position between the outer side of the top of the outer support frame 29 and the inner side of the water channel 30 , a certain depth can be generated, and impurities are deposited at the bottom of the water. Water with fewer impurities on the upper side crosses the water channel 30 and flows into the interior of the water channel 30 .

[0030] In this embodiment, it should also be noted that the vertical partition filter plate 28 is arc-shaped, and the clockwise side of the vertical partition filter plate 28 is bent inward.

[0031] Specifically, when the excessive gas flows upward along the spiral cavity separated by the filter mesh plate 27, the gas will have a tendency to flow inward under the obstruction of the vertical partition filter plate 28, thereby preventing the gas from being affected by the centrifugal force of the spiral trajectory flow, causing all the gas to gather in a position close to the outside, thereby improving the distribution uniformity of the excessive gas during flow.

[0032] In this embodiment, it should also be noted that the limiting slot 18 is an oblique annular slot, and the height of the limiting slot 18 on the left side is higher than that on the right side, and the end of the bottom end of the positioning rod 14 that is plugged into the upper guide cone 13 is square.

[0033] Specifically, through the cooperation between the positioning rod 14 and the upper guide cone 13, the positioning rod 14 can only move in the up and down directions above the upper guide cone 13. When the limiting sleeve 16 rotates, the limiting rod 17 is driven to rotate. The limiting rod 17 drives the positioning rod 14 to move repeatedly in the up and down directions through the limitation of the limiting groove 18.

[0034] In this embodiment, it should also be noted that the filter holes of the bottom filter plate 8 are larger than the filter holes of the filter mesh plate 27 .

[0035] Specifically, the bottom filter plate 8 is installed in a fan-shaped distribution, and the bottom filter plate 8 is installed at a position directly below the lower end of the filter screen plate 27. If water drips directly downward from the lower end of the filter screen plate 27, it will drip onto the surface of the bottom filter plate 8, and the water slides downward along the surface of the bottom filter plate 8. The lower end of the bottom filter plate 8 is connected to the upper surface of the water accumulation plate 9, so that the water will flow along the bottom filter plate 8 to the top of the water accumulation plate 9.

[0036] In this embodiment, it should also be noted that the inner side of the lowermost end of the filter screen plate 27 is higher than the outer side.

[0037] Specifically, the water attached to the surface of the filter mesh plate 27 flows to the bottom and then flows outward along its own lowermost inclined end, and finally drips along the outermost side to the top of the water accumulation plate 9, preventing the water on the surface of the filter mesh plate 27 from dripping onto the surface of the bottom filter plate 8.

[0038] The principle used by the tunnel air quality monitoring device: Light scattering principle: When light hits particles, scattering occurs. The size, shape and refractive index of the particles affect the intensity and direction of the scattered light. By measuring the intensity of the scattered light, the concentration of the particles can be calculated.

[0039] Light absorption principle: When a light source emits light to illuminate particles, the particles absorb a portion of the light energy. The remaining light energy passes through the optical system and finally reaches the absorption detector. By comparing the intensity difference between the incident light and the absorbed light, the chemical composition of the particles can be analyzed. The working principle and use process of the present invention: The light emitter 39 is usually a laser or an LED lamp, which is used to focus the light onto the particles and collect the scattered light; The receiver 38 converts the scattered light into an electrical signal, and the signal processing circuit amplifies, filters, and performs analog-to-digital conversion on the electrical signal to finally obtain a value of the particle concentration. Subsequently, the excessive gas is discharged into the interior of the purifier body shell 1 through the air intake pipe 3. The excessive gas enters the interior of the purifier body shell 1 along the air intake pipe 3 and diffuses outward under the obstruction of the diffusion cone 7. After the excessive gas diffuses outward, it passes through the bottom filter plate 8 and diffuses upward. Finally, the excessive gas enters the spiral cavity formed by the filter mesh plate 27 and flows along the filter mesh plate 27. The bottom of the filter screen plate 27 flows upwards, and water is supplied through the water supply pipe 33. The water supply pipe 33 inputs water into the annular pipe seat 19 and the top annular installation pipe body 34. The water inside the annular pipe seat 19 is sprayed outwardly toward the inside of the filter screen plate 27 along the side groove 12 through the side nozzle 21. At the same time, the top annular installation pipe body 34 sprays water from the top to the surface of the filter screen plate 27 through the top nozzle 35. The water falls on the surface of the filter screen plate 27 and flows downward along the surface of the filter screen plate 27, thereby forming a layer of water film on the outer side of the screen on the surface of the filter screen plate 27. The motor 15 is started, and the limiting sleeve 16 is driven to rotate by the motor 15, and the limiting sleeve 16 drives the limiting clamping rod 17 to rotate. When the limiting clamping rod 17 rotates, it pushes the positioning rod 14 to move up and down in the vertical direction through the restriction of the limiting clamping groove 18, and the positioning rod 14 drives the limiting gear ring 23 to move up and down, and the limiting gear ring 23 drives the limiting gear 22 to rotate, and the limiting gear 22 drives the rotating sleeve 20 to rotate, and the rotating sleeve 20 drives the side nozzle 21 to swing up and down, and the water flow sprayed out during the swinging process of the side nozzle 21 is continuously swung up and down , so that the sprayed water flow can be sprinkled on the surface of the filter screen plate 27 at different angles, so that the water flow can contact the upper and lower surfaces of the filter screen plate 27, and at the same time, the positioning rod 14 moves up and down through the horizontal bracket 24 to drive the inner snap ring seat 25 to move up and down along the outer side of the inner support cylinder 6, and the inner snap ring seat 25 drives the inner support frame 26, the filter screen plate 27 and the vertical partition filter plate 28 to move up and down. During the up and down movement of the filter screen plate 27, the excessive gas in the spiral cavity is pushed by the filter screen plate 27 and contacts the filter screen plate 27. The surface of the filter plate 27 is fully in contact, thereby improving the contact efficiency between the excessive gas and the surface of the filter screen plate 27, so that the excessive gas contacts the water attached to the outer surface of the screen of the filter screen plate 27, and the particulate impurities inside the excessive gas are adsorbed and filtered by the water. During the process of the water on the surface of the filter screen plate 27 flowing downward along the spiral trajectory, it will flow outward to the surface of the outer support frame 29 under the action of centrifugal force. After the water is collected on the surface of the outer support frame 29, the water level rises, and the particulate impurities are precipitated at the bottom of the outer support frame 29 and flow downward along the outer support frame 29. The water on the upper side will pass over the guide The water trough 30 enters the interior of the water guide trough 30, and then flows downward along the water guide trough 30. Finally, the water on the surface of the outer support frame 29 containing large particles of impurities flows downward to the top of the water accumulation plate 9 and is discharged outward through the pollution drain pipe 11. The water inside the water guide trough 30 flows downward into the interior of the annular water accumulation trough 31 and is finally discharged outward through the clean drain pipe 32. The water is initially filtered to facilitate the filtration and recycling of wastewater. The excessive gas after purification and adsorption treatment is discharged upward along the exhaust pipe 4 on the top of the purifier body shell 1 for subsequent treatment.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An air purification device for a tunnel, comprising a tunnel body (37), characterized in that: A reflector (36) is fixedly connected to the top inner wall of the tunnel body (37); a light emitter (39) is provided on the inner wall of one side of the tunnel body (37); a receiver (38) is fixedly connected to the other side of the tunnel body (37); a purifier body shell (1) is provided inside the tunnel body (37); a fixed stand (2) is installed at the bottom of the purifier body shell (1); and the bottoms of a plurality of fixed stands (2) are fixedly connected to the bottom inner wall of the tunnel body (37); An exhaust pipe (4) is installed on the top of the purifier body shell (1), an air intake pipe (3) is installed at the bottom and in the middle of the purifier body shell (1), a positioning bracket (5) is installed on the inner wall of the bottom and at the outside of the air intake pipe (3), an inner support cylinder (6) is installed on the top of the positioning bracket (5), a diffusion cone (7) is installed on the bottom of the inner support cylinder (6) through a bracket, a bottom filter plate (8) is installed at the bottom of the inner support cylinder (6) and at a position close to the outside, a water accumulation plate (9) is installed on the outside of the bottom filter plate (8), and an inner partition cylinder (10) is installed on the outside of the water accumulation plate (9); The top of the inner partition cylinder (10) is mounted on the top inner wall of the purifier body shell (1); a polluted drainage pipe (11) is mounted on the outer wall of the inner partition cylinder (10) and located above the water accumulation plate (9); the outer end of the polluted drainage pipe (11) penetrates the purifier body shell (1) and extends to the outside of the purifier body shell (1); a side groove (12) is formed on the outer wall of the inner support cylinder (6); an upper guide cone (13) is mounted on the bottom inner wall of the side groove (12); a positioning rod (14) is movably inserted at the top of the upper guide cone (13); a motor (15) is mounted on the top inner wall of the inner support cylinder (6); a limiting sleeve (16) is mounted on the output end of the motor (15); a limiting clamping rod (17) is formed on the inner wall of the limiting sleeve (16); and a limiting clamping groove (18) is formed on the outer wall of the positioning rod (14) and located near the top; The limit clamp rod (17) is inserted into the limit clamp groove (18); a side spray assembly is arranged inside the inner support cylinder (6); a filtering and purifying device is arranged outside the inner support cylinder (6); a top annular mounting tube (34) is installed on the inner wall of the purifier body shell (1) through a bracket; a top spray head (35) is installed at the bottom of the top annular mounting tube (34); a water supply pipe (33) is installed on the inner side of the top annular mounting tube (34); the bottom end of the water supply pipe (33) passes through the inner support cylinder (6); the inner support cylinder (6) is connected to the annular pipe seat (19); the lower end of the inner support cylinder (6) passes through the purifier body shell (1) backwards and extends to the rear side of the purifier body shell (1); The side spray assembly comprises an annular tube seat (19), a rotating sleeve (20), a side spray head (21), a limit gear (22) and a limit gear ring (23); the annular tube seat (19) is installed inside the inner support cylinder (6) via a bracket; the rotating sleeve (20) is installed on the outer wall of the annular tube seat (19); the side spray head (21) is installed on the surface of the rotating sleeve (20) and at a position close to the outside; the limit gear (22) is installed on the outer wall of the rotating sleeve (20) and at a position close to the inside; and the limit gear ring (23) is provided on the outer surface of the positioning rod (14); The filtering and purifying device comprises a transverse support (24), an inner snap ring seat (25), an inner support frame (26), a filter screen plate (27), a vertical partition filter plate (28), an outer support frame (29), a water guide groove (30), an annular water sump (31) and a clean drain pipe (32), wherein the transverse support (24) is mounted on the outer wall of the positioning plug rod (14), the inner snap ring seat (25) is movably snap-connected to the outer side of the inner support cylinder (6), the outer end of the transverse support (24) is mounted on the inner wall of the inner snap ring seat (25), the inner support frame (26) is mounted on the outer wall of the inner snap ring seat (25), and the filter screen plate (27) is The outer wall of the inner support frame (26) is mounted, the vertical partition filter plate (28) is mounted on the top of the filter screen plate (27), the outer support frame (29) is mounted on the outer wall of the filter screen plate (27), the water guide groove (30) is mounted on the outer side of the outer support frame (29), the annular water sump (31) is mounted on the inner wall of the inner partition cylinder (10) and is located below the water guide groove (30), the clean drainage pipe (32) is mounted on the outer wall of the annular water sump (31), and the clean drainage pipe (32) passes through the inner partition cylinder (10) and the purifier body shell (1) and extends to the outer side of the purifier body shell (1).

2. The air purification device for a tunnel according to claim 1, characterized in that: The bottom filter plate (8) and the water accumulation plate (9) form an inverted bucket shape, and the inner side of the water accumulation plate (9) extends to the bottom of the filter screen plate (27).

3. The air purification device for a tunnel according to claim 1, characterized in that: The inner support frame (26), the filter screen plate (27), the outer support frame (29) and the water guide groove (30) are all spiral-shaped, and the inner end of the water guide groove (30) is higher than the top of the outer support frame (29).

4. The air purification device for a tunnel according to claim 1, characterized in that: The vertical partition filter plate (28) is arc-shaped, and the clockwise side of the vertical partition filter plate (28) is bent inwards.

5. The air purification device for a tunnel according to claim 4, characterized in that: The limiting slot (18) is an oblique annular slot, and the height of the limiting slot (18) on the left side is higher than that on the right side, and the bottom end of the positioning plug rod (14) plugged into the upper guide cone (13) is square, the filter holes of the bottom filter plate (8) are larger than the filter holes of the filter screen plate (27), and the inner side edge of the bottom end of the filter screen plate (27) is higher than the outer side edge.

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