Air purification fan for tunnel construction

Abstract

The invention discloses an air purification fan for tunnel construction, which comprises an air barrel, the air barrel comprises an air inlet barrel and an air outlet barrel, the air inlet barrel and the air outlet barrel are the same in inner diameter, two parallel tubular fan shells are mounted between the air inlet barrel and the air outlet barrel, the inner diameter of each tubular fan shell is larger than that of the air inlet barrel, and the inner diameter of each tubular fan shell is larger than that of the air outlet barrel. The two tubular fan shells are internally provided with impeller assemblies, each impeller assembly comprises a motor, the motor is axially and rotationally connected with an impeller, the periphery of each impeller is connected with blades through an adjusting mechanism, the diameter of the outermost edge of each blade is equal to the inner diameter of the air inlet barrel after the blades are installed, the periphery of each motor is wrapped with a tubular guide vane shell, and the guide vane shells are connected with the guide vane shells. The front guide vane and the rear guide vane are welded on the periphery of the guide vane shell in a staggered mode. The front edge of the rear guide vane is located in front of the rear edge of the front guide vane. The maximum air volume under the unit inner diameter of the air duct is improved, the efficiency and loss of each blade are optimally controlled ideally, the maximum power is achieved in the peak efficiency state, and the flow field is optimal in the designed flow state.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel ventilation, in particular to an air purification fan for tunnel construction. BACKGROUND

[0002] The tunnel internal purification fan is an air treatment device specially designed for the special environment of the tunnel. The core function is to maximize the air intake volume, solve the problem of accumulation of dust, peculiar smell and other pollutants in the tunnel, and assist in adjusting the air circulation in the tunnel to protect the health of personnel. The main method is to accelerate air flow, make the air pass through the filter screen and other purification components, and realize the adsorption of pollutants in the air.

[0003] The patent document with publication number CN109899306B proposes a fan with wide working range for tunnel ventilation. When the fan is running, external air enters the shell from two positions of the air inlet pipe and the air exhaust pipe, and then is discharged from the shell. The external air acts on the baffle of the driving assembly, which drives the baffle to move and changes the height position of the air exhaust pipe at the same time. The equipment can exhaust air from different height positions below the shell, thereby expanding the air exhaust range of the fan, facilitating large-scale air purification of the tunnel, and improving the practicality of the equipment.

[0004] However, there are many dust particles in the tunnel. When the fan is running, the dust will directly adhere to the fan blades. Even if the filter screen is installed at the air exhaust port, the air flow of the filter screen will decrease with the air pumping, which affects the air purification efficiency. SUMMARY

[0005] The purpose of the present application is to solve the problems of large unit air intake loss, low air intake efficiency, and reduced air flow of the filter screen affecting air purification efficiency in the background art. An air purification fan for tunnel construction is proposed.

[0006] The utility model provides a kind of air purification fan for tunnel construction, including: air duct, the air duct includes air inlet duct and air outlet duct, air inlet duct and air outlet duct inner diameter are same, two parallel tubular fan housings are installed between air inlet duct and air outlet duct, the inner diameter of tubular fan housing is 5-10mm greater than the inner diameter of air inlet duct, the inside of the two tubular fan housings is equipped with impeller assembly, impeller assembly includes motor, the axial rotation of the motor is connected with impeller, the outer periphery of impeller is connected blade by adjusting mechanism, the diameter of outermost edge after blade installation is equal to the inner diameter of air inlet duct, the outer periphery of the motor is covered with tubular guide vane shell, front guide vane and rear guide vane are staggered and welded on the outer periphery of guide vane shell, the leading edge of rear guide vane is located before the trailing edge of front guide vane, the adjusting mechanism includes the circular mounting slot of corresponding blade that is opened in the outer wall of the hub of impeller, circular mounting slot bottom is equipped with more than three adjusting grooves arranged in ring, the mounting shaft of the bottom of blade is connected in each adjusting groove by adjusting screw, the angle of blade relative to hub is controlled.The utility model adopts double-stage fan structure cooperation and can adjust the angle of blade to control air volume flow channel, the diameter of outermost edge after front guide vane and rear guide vane structure cooperation blade installation is equal to the inner diameter of air inlet duct, reduces air volume loss, improves the highest air volume under the unit inner diameter of air duct, the efficiency and loss of each blade are optimally controlled, so that peak efficiency state reaches maximum power, and flow field is best under design flow state.

[0007] The bottom of the air duct is fixedly installed with a mounting base, and a purification mechanism is installed in the air duct.

[0008] The purification mechanism includes a filter screen sliding forward and backward in the air duct, a plurality of sliding blocks are fixedly installed at the arc surface of the filter screen, the plurality of sliding blocks are distributed at equal angles in a ring around the filter screen, a telescopic hydraulic pump is fixedly installed in the air duct, the end of the telescopic hydraulic pump is fixedly connected with the sliding blocks, a hydraulic telescopic rod in communication with the hydraulic pipe of the telescopic hydraulic pump is fixedly installed on the side of the motor facing the impeller, a transmission member is arranged at the end of the hydraulic telescopic rod, a gear tooth is fixedly installed on the side of the impeller facing the motor, a gear shaft is rotatably connected in the air duct, and the gear tooth is connected with the gear shaft through the transmission member.

[0009] A dredging mechanism in contact with the filter screen is arranged at the center of the gear shaft.

[0010] Optionally, the gear shaft and the impeller are parallel to each other, air enters from the filter screen and flows out from the position of the impeller, a partition plate is fixedly installed in the air duct, and a return spring is elastically connected between the sliding block and the partition plate.

[0011] Optionally, the transmission member comprises an adapter plate fixedly installed at the end of the hydraulic telescopic rod, the bottom of the adapter plate is rotationally connected with a first gear, the first gear is located on the rotation path of the tooth, the center of the first gear is fixedly connected with a second gear through a rotating shaft, and the second gear is in meshing connection with the gear shaft.

[0012] Optionally, the tooth is in meshing connection with the first gear after being in contact with the first gear, and the rotating shaft between the first gear and the second gear is in sliding connection with the motor.

[0013] Optionally, the inside of the air duct is provided with a positioning mechanism, the positioning mechanism comprises a first avoiding groove opened in the inside of the air duct, and the inside of the first avoiding groove is elastically connected with a working positioning elastic sheet; the side of the sliding block is provided with a positioning groove, and the positioning groove is in clamping connection with the working positioning elastic sheet.

[0014] Optionally, the inside of the air duct and the sliding path of the sliding block are provided with a second avoiding groove, and the inside of the second avoiding groove is elastically connected with a dredging positioning elastic sheet.

[0015] Optionally, the working positioning elastic sheet and the dredging positioning elastic sheet both adopt an arc-shaped structure, and the positioning groove adopts a semi-cylindrical shape.

[0016] Optionally, the dredging mechanism comprises a butt joint shaft fixedly installed on the rotating shaft of the gear shaft, the end of the butt joint shaft is fixedly installed with a scraper, the scraper is provided with a scraping groove, the entrance of the scraping groove adopts an inclined structure, and the scraping groove is in contact with the filter screen.

[0017] Optionally, the inside of the scraper is slidably connected with a pressing plate in the up-down direction, the inside of the scraper is slidably connected with a brush in the front-rear direction, the side of the brush facing the pressing plate is fixedly installed with a pressure receiving plate, the end of the pressing plate and the end of the pressure receiving plate are provided with inclined surfaces with the same inclination angle, the inclined surface of the pressing plate is in contact with the inclined surface of the pressure receiving plate, the brush is in contact with the filter screen, the middle of the scraper is fixedly installed with an electromagnet attracting the pressing plate, and the side of the scraper facing the filter screen is fixedly installed with a delay switch in electric connection with the electromagnet.

[0018] Optionally, the end of the scraper is rotationally connected with a counterweight clamping plate, and the bottom of the air duct and below the scraper are provided with a dust collecting bin.

[0019] Compared with the prior art, the present application has the following beneficial technical effects:

[0020] 1. In this invention, after the filter screen becomes clogged, the airflow decreases. Under the wind pressure generated by the impeller's suction, the filter screen moves into the interior of the air duct. The filter screen compression telescopic hydraulic pump causes hydraulic oil to enter the hydraulic telescopic rod. The hydraulic telescopic rod extends, engaging the transmission component. The transmission component drives the unblocking mechanism to rotate and unblock the air. In the prior art, periodic cleaning is required. Using the above-mentioned technical means, the uncertainty of dust concentration in the tunnel is avoided, as is untimely periodic cleaning, which affects the purification efficiency and frequent cleaning, which damages the filter screen and prevents air purification.

[0021] 2. This invention uses a working positioning spring to engage with a positioning groove to initially position the filter screen, preventing the filter screen from sliding back and forth and producing abnormal noise due to unstable air pressure from the impeller. At the same time, the collision caused by the back-and-forth sliding of the filter screen will deform it. By engaging the unblocking positioning spring with the positioning groove, the filter screen is positioned when it comes into contact with the unblocking mechanism, preventing the unblocking mechanism from pushing the filter screen away when it rotates to unblock it, thus preventing incomplete unblocking.

[0022] 3. This invention uses a rotating scraper to remove dust from the filter screen surface. Due to the cooperation of the first gear, the second gear, and the gear shaft, the scraper rotates slowly, preventing dust from being stirred up when the scraper scrapes off the dust. A delay switch energizes the electromagnet after a delay, attracting the pressing plate. The pressing plate then presses the pressure plate, causing the brush to extend and clean the filter screen's pores. This achieves the goal of first scraping and then unclogging the filter pores, instead of directly using a brush and causing dust to be stirred up. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the axial half-section structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the three-dimensional structure of the impeller in this invention;

[0025] Figure 3 This is a schematic diagram of a partial cross-sectional view of the impeller in this invention;

[0026] Figure 4 This is a schematic diagram of the impeller hub structure in this invention;

[0027] Figure 5 This is a schematic diagram of the guide vane shell structure in this invention;

[0028] Figure 6 A schematic diagram of the overall structure of the present invention is provided;

[0029] Figure 7 A schematic diagram of the air duct structure of the present invention is provided;

[0030] Figure 8 A half-sectional schematic diagram of the air duct structure of the present invention is provided;

[0031] Figure 9 A part slider structure schematic diagram of the present application is given; Figure 8

[0032] Figure 10 A scraping strip opening structure schematic diagram of the present application is given;

[0033] Figure 11 A hydraulic telescopic rod structure schematic diagram of the present application is given;

[0034] Figure 12 A filter screen structure schematic diagram of the present application is given;

[0035] Figure 13 B part working positioning elastic sheet structure enlarged schematic diagram of the present application is given; Figure 12

[0036] A scraper structure half-section schematic diagram of the present application is given. Figure 14 The figure marks: 1, air duct; 2, mounting base; 3, impeller; 4, purification mechanism; 41, filter screen; 42, slider; 43, partition plate; 44, reset spring; 45, telescopic hydraulic pump; 46, hydraulic telescopic rod; 47, adapter plate; 48, first gear; 49, gear tooth; 410, second gear; 411, gear shaft; 5, motor; 6, positioning mechanism; 61, positioning groove; 62, first avoiding groove; 63, working positioning elastic sheet; 64, second avoiding groove; 65, dredging positioning elastic sheet; 7, dredging mechanism; 71, scraper; 72, butt joint shaft; 73, scraping strip opening; 74, counterweight clamping plate; 75, extrusion plate; 76, pressure receiving plate; 77, brush; 78, delay switch.

[0037] DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments.

[0039] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application.

[0040] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0041] ​​In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] The present application provides a kind of air purification fan for tunnel construction, including: air duct 1, air duct 1 includes air inlet air duct and air outlet air duct 15, the inner diameter of air inlet air duct and air outlet air duct 15 is same, air inlet air duct and air outlet air duct 15 between installation two parallel tubular fan housings 14,25, the inner diameter of tubular fan housing is 5-10mm greater than the inner diameter of air inlet air duct, the inside of the two tubular fan housings is equipped with impeller assembly, impeller assembly includes motor 5, the axial rotation of motor 5 is connected with impeller 3, the outer periphery of impeller 3 is connected with blade 18 by adjusting mechanism, the diameter of outermost edge of blade 18 after installation is equal to the inner diameter of air inlet air duct, the outer periphery of motor 5 is covered with tubular guide vane shell 13, guide vane shell 13 is staggered and welded with front guide vane 11 and rear guide vane 12, the front edge of rear guide vane is located before the rear edge of front guide vane, the adjusting mechanism includes the circular mounting groove 20 of corresponding blade of the circumferential outer wall of the hub 19 of impeller, the circular mounting groove is provided with more than three annular adjustment grooves 21, the mounting shaft 16 of blade bottom is connected in each adjustment groove by adjusting screw 17, the angle of blade relative to hub is controlled.

[0044] Embodiment: the present application provides a kind of air purification fan for tunnel construction, as shown in Figure 6 And Figure 7 As shown, including air duct 1, the bottom of air duct 1 is fixedly installed with mounting base 2, the inside of air duct 1 is fixedly installed with motor 5, the axial rotation of motor 5 is connected with impeller 3.

[0045] The impeller 3 comprises blades and a hub, the hub diameter is selected as 950 mm, and the inner diameter of the air duct 1 is designed as 1600 mm. The number of blades is 13, and the forward-swept blade design used in the transonic fan of the aero-engine impeller in the past decade is adopted to improve the blade efficiency and reduce the influence of blade tip leakage on the flow field. Due to the adoption of the overall small forward-swept blade and the large forward-swept blade tip area, the structural stability of the blade is reduced.

[0046] The blade and the hub are transitioned by a round corner with a radius not less than R10 mm to control the generation of angular vortex. If the blade is manufactured separately, the round corner is manufactured on the blade.

[0047] The inner part of the air duct 1 is provided with a purification mechanism 4, which comprises a filter screen 41 sliding forward and backward in the inner part of the air duct 1. The air in the tunnel enters the air duct 1 through the air extraction of the impeller 3, and is filtered and purified through the filter screen 41.

[0048] The dust concentration in the tunnel fluctuates, and the filter screen cannot judge the clogging time of the filter screen, that is, the service life of the filter screen 41, during the operation of the fan. In the prior art, the filter screen 41 is cleaned periodically. If the dust concentration in the tunnel is small, the filter screen 41 will be damaged due to excessive frequent cleaning, and the dust will directly pass through the filter screen; if the dust concentration in the tunnel is large, the filter screen 41 will be clogged soon, and the periodic cleaning will not be timely, which will affect the purification efficiency.

[0049] As shown in Figure 8 to Figure 11 , a plurality of sliding blocks 42 are fixedly installed at the arc surface of the filter screen 41, the plurality of sliding blocks 42 are distributed at equal angles in a ring around the filter screen 41, a telescopic hydraulic pump 45 is fixedly installed in the inner part of the air duct 1, the end of the telescopic hydraulic pump 45 is fixedly connected with the sliding block 42, a hydraulic telescopic rod 46 in hydraulic communication with the telescopic hydraulic pump 45 is fixedly installed on the side of the motor 5 facing the impeller 3, a partition plate 43 is fixedly installed in the inner part of the air duct 1, and a return spring 44 is elastically connected between the sliding block 42 and the partition plate 43.

[0050] When the filter screen 41 is clogged, the ventilation of the filter screen 41 is reduced, and the filter screen 41 will be pulled by the wind. The filter screen 41 moves towards the impeller 3 and compresses the return spring 44. The filter screen 41 extrudes the telescopic hydraulic pump 45, so that the hydraulic oil enters the hydraulic telescopic rod 46, so that the hydraulic telescopic rod 46 is elongated.

[0051] The end of the hydraulic telescopic rod 46 is provided with a transmission part, the impeller 3 is fixedly installed with a gear tooth 49 on the side facing the motor 5, the inside of the air duct 1 is rotatably connected with a gear shaft 411, and the gear tooth 49 and the gear shaft 411 are connected through the transmission part; the transmission part comprises an adapter plate 47 fixedly installed at the end of the hydraulic telescopic rod 46, the bottom of the adapter plate 47 is rotatably connected with a first gear 48, the first gear 48 is located on the rotation path of the gear tooth 49, the center of the first gear 48 is fixedly connected with a second gear 410 through a rotating shaft, the second gear 410 is meshingly connected with the gear shaft 411, and the center of the gear shaft 411 is provided with a dredging mechanism 7 in contact with the filter screen 41.

[0052] The adapter plate 47 and the first gear 48 are moved downward by the extension of the hydraulic telescopic rod 46, the first gear 48 is moved to the rotation path of the gear tooth 49, the impeller 3 is rotated and drives the first gear 48 to rotate through the gear tooth 49, the first gear 48 drives the gear shaft 411 to rotate through the second gear 410, and the gear shaft 411 drives the dredging mechanism 7 to clean the blocked dust on the filter screen 41.

[0053] The gear ratio of the first gear 48, the second gear 410 and the gear shaft 411 is utilized to reduce the rotation speed of the dredging mechanism 7, so that the filter screen 41 is prevented from being damaged due to the too high rotation speed of the dredging mechanism 7, and the dust on the filter screen 41 is also prevented from being stirred up due to the too high rotation speed of the dredging mechanism 7.

[0054] After the filter screen 41 is blocked, the air flow changes are reduced, the filter screen 41 is moved to the inside of the air duct 1 under the wind pressure formed by the impeller 3, the filter screen 41 compresses the telescopic hydraulic pump 45 to make the hydraulic oil enter the hydraulic telescopic rod 46, the hydraulic telescopic rod 46 is elongated to make the transmission part abut, the transmission part is utilized to drive the dredging mechanism 7 to rotate for dredging, and in the prior art, the cleaning is periodical; by utilizing the technical means, the uncertainty of the dust concentration in the tunnel is avoided, the periodical cleaning is avoided to be not timely, the purification efficiency is affected, and the filter screen 41 is damaged due to the frequent cleaning.

[0055] As shown in Figure 10 , Figure 12 and Figure 13 , the inside of the air duct 1 is provided with a positioning mechanism 6, the positioning mechanism 6 comprises a first avoiding groove 62 formed in the inside of the air duct 1, the inside of the first avoiding groove 62 is elastically connected with a working positioning elastic sheet 63, the side of the sliding block 42 is provided with a positioning groove 61, and the positioning groove 61 is clamped with the working positioning elastic sheet 63.

[0056] The positioning groove 61 and the working positioning elastic sheet 63 are clamped to preliminarily position the filter screen 41, so that the filter screen 41 is prevented from continuously sliding back and forth due to the unstable wind pressure of the impeller 3 and from generating abnormal sound.

[0057] The interior of the air duct 1 and the sliding path of the sliding block 42 are provided with a second avoiding groove 64, and the interior of the second avoiding groove 64 is elastically connected with a dredging positioning elastic sheet 65. In the contact state of the dredging mechanism 7 and the filter screen 41, the positioning groove 61 is clamped with the dredging positioning elastic sheet 65, so that the filter screen 41 is in two states, which respectively correspond to the working state of the filter screen 41 and the dredging state of the filter screen 41.

[0058] The working positioning elastic sheet 63 is clamped with the positioning groove 61 to preliminarily position the filter screen 41, so that the unstable wind pressure of the impeller 3 does not cause the filter screen 41 to continuously slide back and forth, and abnormal sound is generated. Meanwhile, the collision caused by the back and forth sliding of the filter screen 41 will deform the filter screen 41. The dredging positioning elastic sheet 65 is clamped with the positioning groove 61 to position the filter screen 41 when the filter screen 41 contacts the dredging mechanism 7, so that the filter screen 41 is not pushed away when the dredging mechanism 7 rotates to dredge the filter screen 41, and the dredging is not incomplete.

[0059] As shown in Figure 11 and Figure 14 The dredging mechanism 7 comprises a butt joint shaft 72 fixedly installed on the rotating shaft of the gear shaft 411, and the end of the butt joint shaft 72 is fixedly installed with a scraper 71. The scraper 71 is provided with a scraping groove 73, the entrance of the scraping groove 73 adopts an inclined structure, and the scraping groove 73 contacts the filter screen 41.

[0060] The rotation of the scraper 71 removes the dust on the surface of the filter screen 41, and the rotation speed of the scraper 71 is slow due to the cooperation of the first gear 48, the second gear 410 and the gear shaft 411, so that the dust is not stirred up when the dust is scraped off by the scraping groove 73.

[0061] The interior of the scraper 71 is slidably connected with an extrusion plate 75, and the interior of the scraper 71 is slidably connected with a brush 77. The side of the brush 77 facing the extrusion plate 75 is fixedly installed with a pressure plate 76. The end of the extrusion plate 75 and the end of the pressure plate 76 are provided with inclined surfaces with the same inclination angle. The inclined surface of the extrusion plate 75 contacts the inclined surface of the pressure plate 76. The brush 77 contacts the filter screen 41. The middle part of the scraper 71 is fixedly installed with an electromagnet attracting the extrusion plate 75. The side of the scraper 71 facing the filter screen 41 is fixedly installed with a delay switch 78 electrically connected with the electromagnet.

[0062] The delay switch 78 is delayed to power on, the electromagnet is used to attract the extrusion plate 75, the extrusion plate 75 is used to extrude the pressure plate 76 to make the brush 77 extend, and the brush 77 cleans the filter holes of the filter screen 41.

[0063] The extrusion plate 75 extrudes the pressure plate 76 under the action of gravity, so that the brush 77 is extruded out of the interior of the scraper 71, and the scraper 71 cleans the filter holes of the filter screen 41.

[0064] The end of the scraper 71 is rotationally connected with a counterweight clamping plate 74, and a dust collecting bin is arranged at the bottom of the air duct 1 and below the scraper 71. The counterweight clamping plate 74 is a one-way outward opening counterweight plate, and when the counterweight clamping plate 74 is below the scraper 71, the counterweight clamping plate 74 opens under the action of gravity to pour the dust into the dust collecting bin.

[0065] The present application scrapes the dust on the surface of the filter screen 41 by rotating the scraper 71, and due to the cooperation of the first gear 48, the second gear 410 and the gear shaft 411, the rotation speed of the scraper 71 is slow, which avoids the dust being stirred up when the scraper 71 scrapes the dust, the delay switch 78 makes the electromagnet delay power on, the electromagnet attracts the extrusion plate 75, the brush 77 is stretched out by extruding the pressure plate 76 with the extrusion plate 75, and the filter hole of the filter screen 41 is cleaned by the brush 77, so that the filter hole is dredged after being scraped first, and the dust is not stirred up by directly using the brush 77.

[0066] The above specific embodiments are only several optional embodiments of the present application, and based on the technical scheme of the present application and the related inspiration of the above embodiments, those skilled in the art can make various alternative improvements and combinations on the above specific embodiments.

Claims

1. A tunnel construction air purification fan, comprising: The utility model provides a wind tube (1), its characterized in be: wind tube (1) includes the wind inlet wind tube and the air outlet wind tube (15), and the air outlet wind tube (15) inner diameter is same, and the wind inlet wind tube and the air outlet wind tube (15) between installation have two parallel tubular fan housings (14,25), and the inner diameter of tubular fan housing is 5-10mm greater than the wind inlet wind tube inner diameter, and the inside of two tubular fan housings is installed with impeller assembly, and the impeller assembly includes motor (5), and the axial rotation of motor (5) is connected with impeller (3), and the outer periphery of impeller (3) is connected blade (18) through adjusting mechanism, and the diameter of the outermost edge of blade (18) after installation is equal to the inner diameter of the wind inlet wind tube, and the outer periphery of motor (5) is covered with tubular guide vane shell (13), and the outer periphery of guide vane shell (13) is staggered and welded with front guide vane (11) and rear guide vane (12), and the front edge of rear guide vane is located before the rear edge of front guide vane, and the adjusting mechanism includes the circular mounting slot (20) of the hub (19) circumferential outer wall of impeller and is set up with the circular mounting slot (20) corresponding blade, and the circular mounting slot slot bottom is equipped with the more than three adjusting grooves (21) of annular arrangement, and every adjusting groove is connected blade bottom's mounting shaft (16) through adjusting screw (17), and the angle of control blade is relative hub.

2. The air purification fan for tunnel construction according to claim 1, characterized in that: The wind tube (1) is installed with the purification mechanism (4) in, including the filter screen (41) that slides in the wind tube (1) inside front and back, the arc surface of filter screen (41) is fixedly installed with a plurality of sliding blocks (42), a plurality of sliding blocks (42) are annularly equiangularly distributed around filter screen (41), the inside of wind tube (1) is fixedly installed with telescopic hydraulic pump (45), the end of telescopic hydraulic pump (45) is fixedly connected with sliding block (42), the side of motor (5) towards impeller (3) is fixedly installed with the hydraulic pressure telescopic link (46) of hydraulic pressure pipe intercommunication with telescopic hydraulic pump (45), the end of hydraulic pressure telescopic link (46) is provided with transmission part, the side of impeller (3) towards motor (5) is fixedly installed with gear teeth (49), the inside of wind tube (1) is rotatably connected with gear shaft (411), the gear teeth (49) are connected between gear shaft (411) through transmission part; The center of gear shaft (411) is provided with dredging mechanism (7) in contact with filter screen (41);Gear shaft (411) and impeller (3) are parallel to each other, and air enters from filter screen (41) and flows out from the position of impeller (3), and the inside of wind tube (1) is fixedly installed with baffle (43), and sliding block (42) and baffle (43) are elastically connected with return spring (44).

3. The air purification fan for tunnel construction according to claim 2, characterized in that: The transmission part includes the adapter plate (47) of fixed installation in the end of hydraulic pressure telescopic link (46), the bottom of adapter plate (47) is rotatably connected with first gear (48), and first gear (48) is located on the rotation path of gear teeth (49), and the center of first gear (48) is fixedly connected with second gear (410) through rotating shaft, and second gear (410) is engagedly connected with gear shaft (411).

4. The air purification fan for tunnel construction according to claim 3, characterized in that: The tooth (49) is in contact with the first gear (48) and is in meshing engagement, and the rotation shaft between the first gear (48) and the second gear (410) is in sliding connection with the motor (5).

5. The air purification fan for tunnel construction according to claim 4, characterized in that: The inside of the air duct (1) is provided with a positioning mechanism (6), the positioning mechanism (6) comprises a first avoiding groove (62) opened in the inside of the air duct (1), the inside of the first avoiding groove (62) is elastically connected with a working positioning elastic sheet (63), the side of the sliding block (42) is provided with a positioning groove (61), and the positioning groove (61) is in clamping connection with the working positioning elastic sheet (63).

6. The air purification fan for tunnel construction according to claim 5, characterized in that: The inside of the air duct (1) is provided with a second avoiding groove (64) on the sliding path of the sliding block (42), and the inside of the second avoiding groove (64) is elastically connected with a dredging positioning elastic sheet (65).

7. The air purification fan for tunnel construction of claim 6, wherein: The working positioning elastic sheet (63) and the dredging positioning elastic sheet (65) are both in arc-shaped structure, and the positioning groove (61) is in semi-cylindrical shape.

8. The air purification fan for tunnel construction of claim 7, wherein: The dredging mechanism (7) comprises a butt joint shaft (72) fixedly installed on the rotation shaft of the gear shaft (411), the end of the butt joint shaft (72) is fixedly installed with a scraper (71), the scraper (71) is provided with a scraping groove (73), the entrance of the scraping groove (73) is in inclined structure, and the scraping groove (73) is in contact with the filter screen (41).

9. The air purification fan for tunnel construction of claim 8, wherein: The inside of the scraper (71) is slidably connected with an extrusion plate (75) in up-down direction, the inside of the scraper (71) is slidably connected with a brush (77) in front-rear direction, one side of the brush (77) towards the extrusion plate (75) is fixedly installed with a pressure receiving plate (76), the end of the extrusion plate (75) and the end of the pressure receiving plate (76) are provided with inclined surfaces with same inclination angle, the inclined surface of the extrusion plate (75) is in contact with the inclined surface of the pressure receiving plate (76), the brush (77) is in contact with the filter screen (41), the middle of the scraper (71) is fixedly installed with an electromagnet attracting the extrusion plate (75), and one side of the scraper (71) towards the filter screen (41) is fixedly installed with a delay switch (78) in electric connection with the electromagnet.

10. The air purification fan for tunnel construction of claim 9, wherein: The end of the scraper (71) is rotatably connected with a counterweight clamping plate (74), and the bottom of the air duct (1) and below the scraper (71) are provided with a dust collecting bin.

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