Exhaust duct fan convenient to disassemble

Abstract

The application discloses a kind of exhaust pipe fan of convenient disassembly, belong to workshop fan field, the fan includes installation box, two symmetrical side walls of installation box are respectively communicated with air inlet pipe and air outlet pipe, drawer fan is placed in installation box, filter box is connected on air inlet pipe, filter screen is slidably connected in filter box, and pull rope is fixedly connected on the both sides of filter screen;Installation box is fixedly connected with mounting seat, rotatingly connected with rotating shaft on mounting seat, two second bevel gears are fixedly connected on rotating shaft, the end of rotating shaft is fixedly connected with first bevel gear, two pull ropes are respectively stored in the both ends of rotating shaft, first bevel gear can be engaged with one of second bevel gears, to drive rotating shaft forward or reverse, so that one of pull rope is stored, another pull rope is released, and then filter screen slides in filter box;The fan can automatically clean filter screen when opening door maintenance, to avoid the influence caused by filter screen on subsequent maintenance verification.

Description

Technical Field

[0001] This invention relates to the field of workshop fan technology, specifically to an exhaust duct fan that is easy to disassemble. Background Technology

[0002] In the field of ventilation, exhaust duct fans are widely used as key equipment for air circulation. However, traditional exhaust duct fans present several problems in practical use. Firstly, to ensure the cleanliness of the incoming indoor air, filters are typically installed at the air inlet duct. However, when excessive dust accumulates and clogs the filter surface, manual disassembly and cleaning are often required, which is cumbersome, time-consuming, and labor-intensive, significantly impacting equipment efficiency. Secondly, the complex internal structure of the fan makes disassembly difficult when malfunctions require repair or replacement of parts. This not only increases maintenance costs but may also damage the equipment due to frequent disassembly, shortening its lifespan. Furthermore, after maintenance, the fan needs to be tested. If the filter's permeability is poor before testing, resulting in low airflow, it may affect the subsequent test results. Current technology for exhaust duct fan filter cleaning and maintenance suffers from inconvenience and low efficiency, failing to meet practical usage needs. Summary of the Invention

[0003] The purpose of this invention is to provide an exhaust duct fan that is easy to disassemble, which solves the problems of inconvenient filter cleaning and fan maintenance in the prior art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an easily disassembled exhaust duct fan, comprising a mounting box, wherein an air inlet pipe and an air outlet pipe are respectively connected to two symmetrical side walls of the mounting box, a drawer fan is placed inside the mounting box, a filter box is connected to the air inlet pipe, a filter screen is slidably connected inside the filter box, and pull ropes are fixedly connected to both sides of the filter screen.

[0005] The mounting box is hinged with a door, and a rotating shaft is rotatably connected to the mounting box. A pull wire connects the door and the rotating shaft.

[0006] A mounting base is fixedly connected to the mounting box, and a rotating rod is rotatably connected to the mounting base. Two second bevel gears are symmetrically fixedly connected to the rotating rod, and a first bevel gear is fixedly connected to the end of the rotating shaft. Two pull ropes are respectively stored at both ends of the rotating rod. The first bevel gear can mesh with one of the second bevel gears, thereby driving the rotating rod to rotate forward or backward, so that one of the pull ropes is stored and the other pull rope is released, and the filter screen slides inside the filter box.

[0007] Preferably, both ends of the rotating rod are fixedly connected to mounting rods, and storage wheels are slidably connected to the two mounting rods. The two storage wheels are rotatably connected to the mounting base, and the two pull ropes are respectively stored in the two storage wheels.

[0008] Preferably, a slide block is slidably connected to the middle of the mounting base, the rotating rod is rotatably connected to the slide block via a bearing, a small cylinder is fixedly connected to the bottom of the mounting base, and the output end of the small cylinder is fixedly connected to the slide block.

[0009] Preferably, the drawer fan includes a middle cylinder, both ends of which are fixedly connected to limit plates. The limit plates have holes in the middle that mate with the middle cylinder. A motor is fixedly connected to the middle of the middle cylinder, and blades are fixedly connected to the output end of the motor.

[0010] Preferably, a pressure measuring cylinder is fixedly connected to the side wall of the middle cylinder, and two limiting rings are symmetrically connected inside the pressure measuring cylinder. A circular plate is slidably connected between the two limiting rings, and a first spring is connected between the circular plate and one of the limiting rings. The first spring can resist the pressure difference generated when the blade is running and the filter screen is not blocked, so that the circular plate does not slide.

[0011] Preferably, a mounting plate is rotatably connected to the outer wall of the mounting box, and two push switches for controlling the extension or retraction of the small cylinder are provided on the mounting plate. An extension rod is fixedly connected to the circular plate, and a pressure plate is fixedly connected to the end of the extension rod.

[0012] When the filter screen is blocked to increase the pressure difference between the inside and outside of the middle cylinder, the circular plate can slide into the middle cylinder so that the pressure plate presses one of the push switches, thereby engaging one of the second bevel gears with the first bevel gear.

[0013] Preferably, an L-shaped frame is fixedly connected to the mounting box, an active hydraulic rod is fixedly connected to the L-shaped frame, and a passive hydraulic rod is fixedly connected to the mounting box. An oil pipe connects the active hydraulic rod and the passive hydraulic rod. The mounting plate is rotatably connected to the mounting box via a round rod. A cylindrical gear is connected to the round rod via a one-way bearing. A rack meshing with the cylindrical gear is fixedly connected to the output end of the passive hydraulic rod. When the box door is opened, the active hydraulic rod can be pressed to shorten, thereby causing the mounting plate to rotate in one direction, so that the two push switches are alternately within the pressing range of the pressure plate.

[0014] Preferably, a pressure relief pipe is connected to the miniature cylinder, a pressure relief valve is provided on the pressure relief pipe, a first rectangular plate is fixedly connected to the L-shaped frame, a second rectangular plate is fixedly connected to the door, the pressure relief pipe and the pressure relief valve are both fixedly connected to the first rectangular plate, when the door is opened, the second rectangular plate presses the pressure relief valve, so that the miniature cylinder shortens and drives the first bevel gear to not mesh with any of the second bevel gears.

[0015] Preferably, two scraper strips are symmetrically fixedly connected inside the filter box, and both scraper strips are in contact with the air inlet surface of the filter screen.

[0016] Preferably, the edge of the filter screen is fixedly connected to an installation frame, the installation frame slides inside the filter box, a first through groove is provided on the bottom edge of the installation frame, and a second through groove is provided on the bottom wall of the filter box. Before the installation frame slides to both ends of its travel, the first through groove communicates with the second through groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] When the filter screen becomes clogged due to excessive dust, the pressure difference generated by the drawer fan increases during operation. This pressure difference drives the rotating rod to slide axially, causing one of the second bevel gears to mesh with the first bevel gear. When the door is subsequently opened, the first bevel gear drives the rotating rod to rotate synchronously. At this time, one pull rope is retracted, and the other pull rope is released, allowing the filter screen to slide within the filter box. This allows other parts of the filter screen to take over air filtration. With this structural design, when the filter screen becomes clogged and the airflow decreases, maintenance personnel can easily improve the filter screen's permeability by simply opening the door, making it convenient to use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention. Figure 1 ;

[0020] Figure 2 This is a schematic diagram of the overall structure of the present invention. Figure 2 ;

[0021] Figure 3 This is a schematic diagram of the structure of the filter screen in this invention;

[0022] Figure 4 This is a schematic diagram of the drawer fan of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the mounting base of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the small cylinder of the present invention;

[0025] Figure 7 This is a schematic diagram of the active hydraulic rod of the present invention.

[0026] In the diagram: 100, mounting box; 110, air outlet duct; 120, air inlet duct; 130, box door; 131, insertion rod; 140, L-shaped frame; 150, rotating shaft; 160, first bevel gear; 170, pull cable; 180, torsion spring; 200, middle cylinder; 210, limiting plate; 220, handle; 230, motor; 231, blade; 240, pressure measuring cylinder; 250, circular plate; 260, limiting ring; 270, first spring; 280, extension rod; 281, pressure plate; 290, mounting plate; 291, cylindrical gear; 300, filter box; 301, second through slot; 310, mounting frame; 320, filter screen; 32 1. First through slot; 330. Scraper; 340. Pull rope; 341. Guide wheel; 350. Mounting base; 360. Rotating rod; 370. Second bevel gear; 380. Mounting rod; 390. Retracting wheel; 400. Active hydraulic rod; 410. Active cylinder rod; 420. Oil pipe; 430. Passive hydraulic rod; 440. Passive cylinder rod; 450. Rack; 460. Press switch; 470. Slide; 480. Pneumatic rod; 481. Piston cylinder; 482. Second spring; 490. Small air pump; 491. Air pumping pipe; 492. Pressure relief pipe; 493. Second rectangular plate; 494. First rectangular plate; 495. Pressure relief valve. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Reference Figures 1-7This embodiment provides a technical solution: an easily detachable exhaust duct fan, including a mounting box 100. An inlet pipe 120 and an outlet pipe 110 are respectively connected to two symmetrical side walls of the mounting box 100. A drawer fan is placed inside the mounting box 100. A filter box 300 is connected to the inlet pipe 120, and a filter screen 320 is slidably connected inside the filter box 300. Pull ropes 340 are fixedly connected to both sides of the filter screen 320. A door 130 is hinged to the mounting box 100, and a rotating shaft 150 is rotatably connected to the mounting box 100. A pull wire 1 is connected between the door 130 and the rotating shaft 150. 70; A mounting base 350 is fixedly connected to the mounting box 100, and a rotating rod 360 is rotatably connected to the mounting base 350. Two second bevel gears 370 are symmetrically fixedly connected to the rotating rod 360. A first bevel gear 160 is fixedly connected to the end of the rotating shaft 150. Two pull ropes 340 are respectively stored at both ends of the rotating rod 360. The first bevel gear 160 can mesh with one of the second bevel gears 370, thereby driving the rotating rod 360 to rotate forward or backward, so that one pull rope 340 is stored and the other pull rope 340 is released, and the filter screen 320 slides in the filter box 300.

[0029] The mounting box 100 is customized according to the size of the drawer fan. If the drawer fan is large, it is suspended by ropes on the mounting box 100. The two symmetrical walls of the mounting box 100 are connected to the air inlet pipe 120 and the air outlet pipe 110 respectively. When the drawer fan is running, the outside air enters through the air inlet pipe 120 and is discharged into the room through the air outlet pipe 110. By opening the box door 130, the drawer fan inside the mounting box 100 can be inspected or replaced.

[0030] The filter 320 isolates dust from the incoming air. When the filter 320 becomes clogged due to excessive dust, the pressure difference generated by the drawer fan increases. This pressure difference drives the rotating rod 360 to slide axially, causing one of the second bevel gears 370 to mesh with the first bevel gear 160. When the door 130 is opened, the first bevel gear 160 drives the rotating rod 360 to rotate synchronously. At this time, one of the pull ropes 340 is retracted and the other pull rope 340 is released, which in turn drives the filter 320 to slide within the filter box 300, allowing other parts of the filter 320 to take over air filtration.

[0031] With the above structural design, when the filter 320 is blocked and the air volume is reduced, the maintenance personnel can improve the permeability of the filter 320 by opening the box door 130, which is more convenient to use. At the same time, if the drawer fan is damaged, the permeability of the filter 320 will not affect the post-repair test after maintenance.

[0032] In addition, the two second bevel gears 370 can alternately mesh with the first bevel gear 160, so that after the filter screen 320 slides in one direction, if the filter screen 320 is blocked again, the filter screen 320 can slide in the other direction.

[0033] A plug rod 131 is inserted into the cabinet door 130, and a pull wire 170 is fixedly connected to the plug rod 131. To take out the drawer fan, the cabinet door 130 can be opened and the plug rod 131 can be pulled out to avoid the pull wire 170 from obstructing the view.

[0034] A torsion spring 180 is also connected between the end of the rotating shaft 150 and the mounting box 100. When the box door 130 is closed, the torsion spring 180 elastically returns, allowing the pull cable 170 to be retracted.

[0035] Both ends of the rotating rod 360 are fixedly connected to the mounting rod 380. The two mounting rods 380 are slidably connected to the storage wheels 390. The two storage wheels 390 are rotatably connected to the mounting base 350. The two pull ropes 340 are respectively stored in the two storage wheels 390.

[0036] The storage wheel 390 is rotatably connected to the mounting base 350, but the storage wheel 390 will not move axially. When the rotating rod 360 slides and drives the two second bevel gears 370 to move, the mounting rods 380 at both ends of the rotating rod 360 slide synchronously. Since the mounting rod 380 is keyed to the storage wheel 390, the axial movement of the rotating rod 360 is not interfered with, and the storage wheel 390 is driven to rotate normally.

[0037] Multiple guide wheels 341 are rotatably connected to the filter box 300. The guide wheels 341 are used to change the pulling direction of the pull rope 340.

[0038] A slide block 470 is slidably connected to the middle of the mounting base 350. The rotating rod 360 is rotatably connected to the slide block 470 through a bearing. A small cylinder is fixedly connected to the bottom of the mounting base 350, and the output end of the small cylinder is fixedly connected to the slide block 470.

[0039] The small cylinder operates alternately in extension and retraction. When the small cylinder extends or retracts, it can drive the mounting base 350 to slide linearly back and forth. The rotating rod 360 is rotatably connected to the mounting base 350 but does not slide axially relative to the mounting base 350. When the small cylinder is running, it drives two second bevel gears 370 to alternately mesh with the first bevel gear 160.

[0040] The drawer fan includes a middle cylinder 200, with limit plates 210 fixedly connected to both ends of the middle cylinder 200. The limit plates 210 have holes in the middle that mate with the middle cylinder 200. A motor 230 is fixedly connected to the middle of the middle cylinder 200, and blades 231 are fixedly connected to the output end of the motor 230.

[0041] The middle cylinder 200, the air inlet pipe 120, and the air outlet pipe 110 are all on the same axis. When the motor 230 runs, the blades 231 rotate, allowing outside air to enter the room. The two limiting plates 210 are set so that when the door 130 is closed, the four sides of the limiting plates 210 fit against the inner wall of the mounting box 100 and the inner wall of the door 130, so that the drawer fan can be firmly fixed in the mounting box 100. A handle 220 is also fixedly connected to the side wall of the middle cylinder 200, and the drawer fan can be easily taken out and put in by pulling the handle 220.

[0042] A pressure measuring cylinder 240 is fixedly connected to the side wall of the middle cylinder 200. Two limiting rings 260 are symmetrically connected inside the pressure measuring cylinder 240. A circular plate 250 is slidably connected between the two limiting rings 260. A first spring 270 is connected between the circular plate 250 and one of the limiting rings 260. The first spring 270 can resist the pressure difference generated when the blade 231 is running and the filter screen 320 is not blocked, so that the circular plate 250 does not slide.

[0043] The pressure measuring cylinder 240 connects the space between the filter screen 320 and the blade 231. When the blade 231 rotates, the air pressure at the air inlet of the blade 231 is lower than the atmospheric pressure. When the filter screen 320 is not blocked, the pressure difference generated by this part can be offset by the elastic force of the first spring 270, so that the circular plate 250 does not slide. However, when the filter screen 320 is blocked, the pressure difference will increase and exceed the elastic force of the first spring 270. At this time, the circular plate 250 can slide towards the axis of the middle cylinder 200, which indicates that the filter screen 320 is blocked.

[0044] A mounting plate 290 is rotatably connected to the outer wall of the mounting box 100. The mounting plate 290 is provided with two push-button switches 460 for controlling the extension or retraction of the small cylinder. An extension rod 280 is fixedly connected to the circular plate 250, and a pressure plate 281 is fixedly connected to the end of the extension rod 280. When the filter screen 320 is blocked to increase the pressure difference between the inside and outside of the middle cylinder 200, the circular plate 250 can slide into the middle cylinder 200 so that the pressure plate 281 presses one of the push-button switches 460, thereby engaging one of the second bevel gears 370 with the first bevel gear 160.

[0045] Each time the door 130 opens and closes, it drives the mounting plate 290 to rotate 180 degrees, so that the two push switches 460 are alternately in the pressing range of the pressure plate 281. When the pressure difference between the inside and outside of the middle cylinder 200 increases, the pressure plate 281 moves closer to the push switch 460 in its pressing range. When the pressure difference reaches a sufficiently large value, the pressure plate 281 presses the push switch 460, causing the small cylinder to extend or shorten, thereby driving one of the second bevel gears 370 to mesh with the first bevel gear 160.

[0046] The miniature cylinder includes a piston cylinder 481, a piston rod 480 that slides inside the piston cylinder 481 via a second spring 482, a miniature air pump 490, and an air pumping pipe 491 connecting the miniature air pump 490 and the piston cylinder 481. The piston rod 480 is fixedly connected to a slide block 470. Two push switches 460 control the miniature air pump 490 to inject or depress air into the piston cylinder 481 through the air pumping pipe 491, thereby causing the miniature cylinder to extend or shorten.

[0047] An L-shaped frame 140 is fixedly connected to the mounting box 100. An active hydraulic rod 400 is fixedly connected to the L-shaped frame 140. A passive hydraulic rod 430 is fixedly connected to the mounting box 100. An oil pipe 420 connects the active hydraulic rod 400 and the passive hydraulic rod 430. The mounting plate 290 is rotatably connected to the mounting box 100 via a round rod. A cylindrical gear 291 is connected to the round rod via a one-way bearing. A rack 450 that meshes with the cylindrical gear 291 is fixedly connected to the output end of the passive hydraulic rod 430. When the box door 130 is opened, the active hydraulic rod 400 can be pressed to shorten, thereby causing the mounting plate 290 to rotate in one direction, so that the two push switches 460 are alternately in the pressing range of the pressure plate 281.

[0048] After the door 130 is opened, it can press the active cylinder rod 410 of the active hydraulic rod 400, causing the hydraulic oil in the active hydraulic rod 400 to enter the passive hydraulic rod 430 through the oil pipe 420, causing the passive cylinder rod 440 to extend. This causes the rack 450 to move and drive the cylindrical gear 291 to rotate 180 degrees. At this time, the cylindrical gear 291 drives the mounting plate 290 to rotate 180 degrees through the one-way bearing, so that another push switch 460 is within the pressing range of the pressure plate 281. The active hydraulic rod 400 and the active cylinder rod 430 are then in contact with each other. Springs are also connected between rods 410. When the door 130 is closed, the door 130 no longer applies pressure to the active cylinder rod 410. The spring drives the active cylinder rod 410 to slide on the cylinder body of the active hydraulic rod 400. At this time, the hydraulic oil flows back, and the rack 450 slides back. The rack 450 still drives the cylindrical gear 291 to rotate, but the cylindrical gear 291 rotates relative to the round rod on the mounting plate 290. Therefore, the mounting plate 290 will not move at this time, thus ensuring that the two push switches 460 can alternately be in the pressing range of the pressure plate 281.

[0049] A pressure relief pipe 492 is connected to the small cylinder, and a pressure relief valve 495 is installed on the pressure relief pipe 492. A first rectangular plate 494 is fixedly connected to the L-shaped frame 140, and a second rectangular plate 493 is fixedly connected to the door 130. The pressure relief pipe 492 and the pressure relief valve 495 are both fixedly connected to the first rectangular plate 494. When the door 130 is opened, the second rectangular plate 493 presses the pressure relief valve 495 so that the small cylinder shortens and drives the first bevel gear 160 to not mesh with any of the second bevel gears 370.

[0050] After the door 130 is opened, it can contact the L-shaped frame 140. At the same time, the second rectangular plate 493 on the door 130 is close to the first rectangular plate 494 on the L-shaped frame 140. At this time, the second rectangular plate 493 can press the pressure relief valve 495, and then the pressure relief pipe 492 makes the internal space of the piston cylinder 481 connected with the outside. The second spring 482 elastically returns, causing the air rod 480 to slide back to its original position, so that neither of the second bevel gears 370 meshes with the first bevel gear 160. This ensures that when the small air pump 490 draws or discharges air into the piston cylinder 481, the other second bevel gear 370 can mesh with the first bevel gear 160. It also prevents the filter screen 320 from sliding in the opposite direction when the door 130 is closed.

[0051] Two scraper strips 330 are symmetrically fixedly connected inside the filter box 300, and both scraper strips 330 are in contact with the air inlet surface of the filter screen 320.

[0052] When the filter screen 320 slides, the scraper 330 can scrape the surface of the filter screen 320, thereby causing the dust and other debris attached to the filter screen 320 to fall off.

[0053] The edge of the filter screen 320 is fixedly connected to the mounting frame 310, which slides inside the filter box 300. A first through groove 321 is provided on the bottom edge of the mounting frame 310, and a second through groove 301 is provided on the bottom wall of the filter box 300. Before the mounting frame 310 slides to both ends of its travel, the first through groove 321 and the second through groove 301 are connected.

[0054] When the door 130 is fully opened, it can drive the mounting frame 310 to slide to any end of the interior of the filter box 300. In this state, the first channel 321 is not connected to the second channel 301, ensuring that external air will not enter through the first channel 321 and the second channel 301, thus making the first channel 321 and the second channel 301 less prone to blockage. During the sliding of the mounting frame 310, the scraper 330 scrapes the filter screen 320. At this time, the first channel 321 is connected to the second channel 301, so that the dust and other debris scraped off can be discharged from the filter box 300 through the first channel 321 and the second channel 301, ensuring that the filter screen 320 can still have good permeability when the position of the filter screen 320 is changed next time.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A detachable exhaust duct fan, comprising a mounting box (100), wherein an air inlet pipe (120) and an air outlet pipe (110) are respectively connected to two symmetrical side walls of the mounting box (100), characterized in that: A drawer fan is placed inside the mounting box (100), and a filter box (300) is connected to the air inlet pipe (120). A filter screen (320) is slidably connected inside the filter box (300), and pull ropes (340) are fixedly connected to both sides of the filter screen (320). The mounting box (100) is hinged with a door (130), and a rotating shaft (150) is rotatably connected to the mounting box (100). A pull wire (170) is connected between the door (130) and the rotating shaft (150). A mounting base (350) is fixedly connected to the mounting box (100). A rotating rod (360) is rotatably connected to the mounting base (350). Two second bevel gears (370) are symmetrically fixedly connected to the rotating rod (360). A first bevel gear (160) is fixedly connected to the end of the rotating shaft (150). Two pull ropes (340) are respectively stored at both ends of the rotating rod (360). The first bevel gear (160) can mesh with one of the second bevel gears (370), thereby driving the rotating rod (360) to rotate forward or backward, so that one of the pull ropes (340) is stored and the other pull rope (340) is released, and the filter screen (320) slides in the filter box (300). The drawer fan includes a middle cylinder (200), a pressure measuring cylinder (240) is fixedly connected to the side wall of the middle cylinder (200), two limiting rings (260) are symmetrically connected inside the pressure measuring cylinder (240), a circular plate (250) is slidably connected between the two limiting rings (260), an mounting plate (290) is rotatably connected to the outer wall of the mounting box (100), a small cylinder is fixedly connected to the bottom of the mounting base (350), two push switches (460) for controlling the extension or retraction of the small cylinder are provided on the mounting plate (290), an extension rod (280) is fixedly connected to the circular plate (250), and a pressure plate (281) is fixedly connected to the end of the extension rod (280). When the filter (320) is blocked to increase the pressure difference between the inside and outside of the middle cylinder (200), the circular plate (250) can slide into the middle cylinder (200) so that the pressure plate (281) presses one of the push switches (460), thereby one of the second bevel gears (370) meshes with the first bevel gear (160).

2. The easily disassembled exhaust duct fan according to claim 1, characterized in that: Both ends of the rotating rod (360) are fixedly connected to the mounting rod (380), and the two mounting rods (380) are slidably connected to the storage wheel (390). The two storage wheels (390) are rotatably connected to the mounting base (350), and the two pull ropes (340) are respectively stored in the two storage wheels (390).

3. The easily disassembled exhaust duct fan according to claim 1, characterized in that: The mounting base (350) is slidably connected to the middle of the slide block (470), the rotating rod (360) is rotatably connected to the slide block (470) through a bearing, and the output end of the small cylinder is fixedly connected to the slide block (470).

4. The easily disassembled exhaust duct fan according to claim 3, characterized in that: Both ends of the middle cylinder (200) are fixedly connected to limit plates (210). The middle of the limit plate (210) is provided with a hole that cooperates with the middle cylinder (200). The middle of the middle cylinder (200) is fixedly connected to a motor (230), and the output end of the motor (230) is fixedly connected to a blade (231).

5. The easily disassembled exhaust duct fan according to claim 4, characterized in that: A first spring (270) is connected between the circular plate (250) and one of the limiting rings (260). The first spring (270) can resist the pressure difference generated when the blade (231) is running and the filter screen (320) is not blocked, so that the circular plate (250) does not slide.

6. The easily disassembled exhaust duct fan according to claim 5, characterized in that: An L-shaped frame (140) is fixedly connected to the mounting box (100), an active hydraulic rod (400) is fixedly connected to the L-shaped frame (140), a passive hydraulic rod (430) is fixedly connected to the mounting box (100), and an oil pipe (420) connects the active hydraulic rod (400) and the passive hydraulic rod (430). The mounting plate (290) is rotatably connected to the mounting box (100) via a round rod, and a cylindrical gear (291) is connected to the round rod via a one-way bearing. A rack (450) that meshes with the cylindrical gear (291) is fixedly connected to the output end of the passive hydraulic rod (430). When the box door (130) is opened, the active hydraulic rod (400) can be pressed to shorten, thereby causing the mounting plate (290) to rotate in one direction, so that the two push switches (460) are alternately in the pressing range of the pressure plate (281).

7. The easily disassembled exhaust duct fan according to claim 6, characterized in that: The small cylinder is connected to a pressure relief pipe (492), and a pressure relief valve (495) is provided on the pressure relief pipe (492). A first rectangular plate (494) is fixedly connected to the L-shaped frame (140), and a second rectangular plate (493) is fixedly connected to the box door (130). The pressure relief pipe (492) and the pressure relief valve (495) are both fixedly connected to the first rectangular plate (494). When the box door (130) is opened, the second rectangular plate (493) presses the pressure relief valve (495) so that the small cylinder shortens and drives the first bevel gear (160) to not mesh with any of the second bevel gears (370).

8. The easily disassembled exhaust duct fan according to claim 1, characterized in that: Two scraper strips (330) are symmetrically fixedly connected inside the filter box (300), and both scraper strips (330) are in contact with the air inlet surface of the filter screen (320).

9. The easily disassembled exhaust duct fan according to claim 8, characterized in that: The edge of the filter screen (320) is fixedly connected to the mounting frame (310), the mounting frame (310) slides inside the filter box (300), a first through groove (321) is provided on the bottom edge of the mounting frame (310), and a second through groove (301) is provided on the bottom wall of the filter box (300). Before the mounting frame (310) slides to both ends of its travel, the first through groove (321) communicates with the second through groove (301).

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