Glass reinforced plastic air duct

Abstract

The application relates to a glass steel air duct and relates to the technical field of ventilation equipment, which comprises a first duct pipe and a second duct pipe, the first duct pipe is internally provided with a dynamic flow regulation mechanism, and the bottom of the second duct pipe is provided with an opening and closing door structure. The dynamic flow regulation mechanism drives the rotation of an impeller by using airflow, drives the reciprocating swing of a one-letter blade in two symmetrical disturbance structures through the meshing transmission of a driving gear, a transfer gear and a driven gear, continuously mixes the airflow on the cross section of the air duct, makes the wind speed distribution tend to be uniform, and automatically adjusts the disturbance intensity according to the wind speed change without external power. The opening and closing door structure realizes the turning, opening and closing of the bottom plate through the cooperation of the bottom plate, a triangular strip, a sliding block and a sliding rail, the maintenance channel can be opened by pulling out the bolt and pulling the bottom plate, and the bolt is locked after being closed, and a sealing strip guarantees air tightness. The air duct is compact in structure, improves ventilation uniformity, and is convenient for daily maintenance.

Description

Technical Field

[0001] This application relates to the field of ventilation equipment technology, and in particular to a fiberglass ventilation duct. Background Technology

[0002] Fiberglass ventilation ducts are widely used in ventilation systems of various industrial plants due to their lightweight, high strength, and good corrosion resistance. Most existing fiberglass ventilation ducts are segmented structures, with each segment connected by flanges and bolts, and can be assembled on-site according to the length of the ventilation duct.

[0003] Currently, Chinese patent CN218348846U discloses a fiberglass damper. This damper includes a duct body with a baffle plate rotatably connected to the bottom of the duct body. A mounting bracket is installed at the top of the duct body, and a guide wheel is rotatably connected to the mounting bracket via bearings. A support frame is installed on the right side of the bottom of the duct body's inner wall, and a winding wheel is mounted on the support frame via bearings. A winding motor is connected to the support frame via a bracket, and the output end of the winding motor is connected to the winding wheel. A pull ring is connected to the top of the baffle plate, and a traction rope is attached to the pull ring. The other end of the traction rope is connected to the winding wheel. A smoke alarm electrically connected to the winding motor is also included. When the smoke concentration in the duct reaches a certain level, the smoke alarm is activated, controlling the winding motor to start and drive the winding wheel to rotate, winding the traction rope and thus pulling up the baffle plate to seal the inside of the duct, preventing smoke from spreading to other areas through the ventilation system. Furthermore, a filter screen is installed inside the duct body of this damper using mounting clips and mounting blocks to intercept dust that accumulates in the duct over time.

[0004] In central air conditioning systems, existing FRP (fiberglass reinforced plastic) duct products often exhibit uneven airflow distribution across their cross-sections under normal ventilation conditions, with higher wind speeds in the central area and lower speeds near the walls, thus affecting ventilation efficiency to some extent. Furthermore, while some solutions improve airflow distribution by adding guide vanes or rectifiers inside the duct, the positions and angles of these structures are fixed, only effective for specific wind speed ranges. In actual operation, fluctuations in airflow reduce the rectification effect. Additionally, long-term use often results in dust and scale buildup on the inner walls of the ducts. Since most existing ducts are enclosed structures, cleaning the inner walls typically requires disassembling the entire duct section, making maintenance cumbersome. Summary of the Invention

[0005] Therefore, it is necessary to provide a fiberglass ventilation duct to address the aforementioned technical problems.

[0006] This application provides a fiberglass duct, employing the following technical solution: It includes a first tube, with a second tube locked and fixed to the side of the first tube; a dynamic rectification mechanism is locked inside the first tube, and an opening / closing door structure is provided inside the bottom side of the second tube. The dynamic rectification mechanism includes an impeller, with a rotating shaft coaxially fixed to the right side of the impeller. The rotating shaft passes through and rotates within the middle of a support frame. The front and rear sides of the support frame are respectively fastened to the front and rear sides of the inner wall of the first tube. A drive gear is fixedly connected to the right end of the rotating shaft. A first intermediate gear and a second intermediate gear mesh with the front and rear sides of the drive gear, respectively. A first driven gear meshes with the rear side of the second intermediate gear. A first disturbance structure is coaxially connected to the right side of the first driven gear. A second driven gear meshes with the front side of the first intermediate gear. A second disturbance structure is coaxially connected to the right side of the second driven gear. The left central shaft of both the first and second driven gears is rotatably connected to the support frame.

[0007] Preferably, the first and second cylindrical tubes have the same structure, both being assembled from a straight pipe section and a flange connected to the end of the straight pipe section.

[0008] Preferably, a protective plate is provided on the right side of the drive gear, and a pin is provided on both the front and rear sides of the left side of the protective plate. The two pins respectively penetrate and rotate inside the middle side of the first intermediate gear and the second intermediate gear, and the left ends of the two pins are fixed to the bracket. The protective plate plays an axial limiting and protection role for the drive gear, the first intermediate gear and the second intermediate gear, preventing the gears from axially moving during operation.

[0009] Preferably, the first disturbance structure and the second disturbance structure have the same structure and size, and are arranged symmetrically in the middle of the first tube, which can make the airflow disturbance inside the first tube more uniform and avoid the occurrence of flow deviation.

[0010] Preferably, the first disturbance structure includes a pad that is locked and fixed to the inner wall of the first cylinder on its rear side, a power assembly that is fixed to the front side of the pad, the left end of the power assembly that is coaxially connected to the right side of the first driven gear, and a blade that is locked to the right end of the power assembly.

[0011] Preferably, the power assembly includes a frame that is fastened to the rear side of the base. A portal frame is fixedly connected to the top left side of the frame. A first bearing seat is provided in the lower middle part of the inner side of the portal frame, and the bottom of the first bearing seat is fastened to the frame. A rocker arm rotates through the first bearing seat. The left end of the rocker arm is coaxially connected to a first driven gear, and the right side of the rocker arm slides inside a slotted rod. The top left end of the slotted rod rotates inside a second bearing seat. The second bearing seat is fastened to the top middle side of the portal frame. A sector-shaped toothed block is locked and fixed to the top right end of the slotted rod. A gear rod is engaged at the bottom of the sector-shaped toothed block. The gear rod rotates through the inside of a third bearing seat, and the third bearing seat is fastened to the top right side of the frame. The part of the gear rod extending out of the right side of the third bearing seat is coaxially connected to a blade.

[0012] Preferably, the grooved rod has a longitudinally formed strip groove inside, and a protruding post is eccentrically provided on the right side of the rocker arm. The protruding post is inserted and slides inside the strip groove. Through the sliding cooperation between the protruding post and the strip groove, the rotational motion of the rocker arm is converted into the reciprocating oscillating motion of the grooved rod around the axis of the second bearing seat.

[0013] Preferably, the axis of the connection between the groove rod and the second bearing seat coincides with the axis of the connection between the groove rod and the sector tooth block; the axis of the connection between the rocker arm and the first driven gear coincides with the axis of the gear rod; this ensures the accuracy and smoothness of motion transmission and reduces additional torque loss.

[0014] Preferably, the opening and closing door structure includes a protective frame embedded and fixed inside the bottom side of the second cylinder. A slide rail is horizontally and tightly fixed to the rear wall of the inner side of the protective frame. A slider is slidably connected to the front side of the slide rail. The front side of the slider rotates through the right side of the rear wall of the triangular strip, and the bottom of the triangular strip is tightly fixed to a base plate. A rod is rotatably connected to the rear wall of the triangular strip near the connection point with the slider. A block is inserted and rotated into the rear side of the top of the rod. The block is tightly fixed to the rear side of the inner wall of the second cylinder. A positioning seat is tightly fixed to the left side of the bottom of the protective frame. A pin is inserted through the positioning seat. A sealing strip is provided on the outer periphery of the base plate. When the base plate is flipped to the top, its bottom end face is flush with the bottom end face of the protective frame, and the left side of the bottom of the base plate contacts the top of the pin.

[0015] Preferably, a groove is provided on the bottom right side of the base plate for flipping and opening the base plate; a slanted groove is provided on the lower left side of the inner wall of the guard frame, and a slanted surface is provided on the left side of the triangular strip to prevent interference with the movement path of the triangular strip.

[0016] In summary, this application includes the following beneficial technical effects: 1. This application utilizes a dynamic rectification mechanism inside the first tube to drive the impeller to rotate using the kinetic energy of the airflow itself. The power is then transmitted to a pair of symmetrically arranged disturbance structures via a gear transmission system, causing the blades to continuously oscillate. This oscillation forces the high-speed and low-speed airflows on the cross-section of the duct to mix, making the airflow speed at different locations more uniform, thereby effectively improving the uniformity of wind speed distribution. At the same time, the oscillation frequency of the blades automatically adjusts with changes in wind speed. The disturbance is enhanced when the wind speed is high and weakened when the wind speed is low. This adaptive adjustment method does not rely on any external power supply or controller, improving ventilation efficiency without increasing energy consumption or equipment costs.

[0017] 2. The opening and closing door structure at the bottom of the second cylinder in this application, through a linkage slider mechanism consisting of a base plate, triangular strip, slider, slide rail, and support rod, enables the rapid opening and closing of the base plate. Maintenance personnel do not need to disassemble the entire cylinder; they only need to pull out the pin and pull the base plate to obtain access to the interior of the air duct, greatly reducing the difficulty and time required for inspection, cleaning, and maintenance inside the air duct. The sealing strip on the outer periphery of the base plate fits tightly against the inner wall of the protective frame when closed, and with the locking of the pin, it ensures airtightness during normal use and prevents the base plate from accidentally opening due to vibration or air pressure fluctuations. The cooperation between the inclined groove and the inclined surface of the triangular strip ensures smooth opening and closing of the door and avoids motion interference.

[0018] 3. This application integrates the dynamic rectification mechanism and the opening and closing door structure into different cylinder sections, without occupying external space of the duct, facilitating installation and layout in limited spaces; the cylinder sections are connected by flanges, and the number of cylinder sections can be flexibly increased or decreased according to the actual length of the ventilation duct, which is convenient for on-site assembly and also convenient for transportation and storage after disassembly; the gear transmission system is made of engineering plastics, with low operating noise and no need for frequent lubrication; the sealing strip is made of silicone rubber, which has good aging resistance and can maintain elasticity even after long-term use, reducing the workload of daily maintenance; the layout of each structural component is compact and reasonable, and the overall assembly process is clear, which has good on-site construction convenience. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 For this application Figure 1 A top-view diagram of the internal structure; Figure 3 This is a schematic diagram of the dynamic rectification mechanism of this application; Figure 4 This is a schematic diagram of the connection between the drive gear, the first intermediate gear, and the second intermediate gear in this application. Figure 5 This is a schematic diagram of the first disturbance structure in this application; Figure 6For this application Figure 5 Schematic diagram of the right-side structure of the power assembly; Figure 7 This is a three-dimensional structural diagram of the connection between the sector-shaped tooth block and the gear rod in this application; Figure 8 This is a structural diagram of the opening and closing door structure of this application; Figure 9 For this application Figure 8 A schematic diagram of the connection between the middle slide rail and the slider.

[0020] Explanation of reference numerals in the attached drawings: 1. First cylinder; 2. Second cylinder; 3. Dynamic rectification mechanism; 4. Opening and closing gate structure; 31. Impeller; 32. Rotating shaft; 33. Support; 34. Driving gear; 35. First intermediate gear; 36. Second intermediate gear; 37. First driven gear; 38. First disturbance structure; 39. Second driven gear; 310. Second disturbance structure; 311. Protective plate; 381. Pad; 382. Power assembly; 383. Slotted blade; 382. 1. Carrier frame; 3822. Portal frame; 3823. First bearing seat; 3824. Rocker arm; 3825. Groove rod; 3826. Second bearing seat; 3827. Sector-shaped toothed block; 3828. Gear rod; 3829. Third bearing seat; 38241. Protruding column; 41. Protective frame; 42. Slide rail; 43. Slider; 44. Triangular strip; 45. Base plate; 46. Support rod; 47. Support block; 48. Positioning seat; 49. Pin; 411. Inclined groove; 451. Groove. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0022] like Figure 1 and Figure 2 As shown, the fiberglass duct provided in this application mainly consists of two sections: a first tube 1 and a second tube 2. The first tube 1 and the second tube 2 have identical structures. Each section consists of a straight pipe section and a flange fixed to the end of the straight pipe section. Multiple connection holes are opened on the flange end face. When the two tube sections are joined, a sealing gasket is placed between the flanges, and then bolts and nuts are used to tighten them. A dynamic flow rectification mechanism 3 is installed inside the first tube 1, responsible for actively regulating the airflow passing through the tube. The bottom of the second tube 2 is equipped with an opening and closing door structure 4, facilitating future maintenance personnel to enter the duct for inspection and cleaning.

[0023] See Figure 3 and Figure 4The dynamic rectification mechanism 3 includes a frame-shaped support 33 serving as the mounting base. The front and rear sides of the support 33 are bolted to the front and rear sides of the inner wall of the first cylindrical tube 1, respectively. The support 33 is located inside the first cylindrical tube 1 near the center. An impeller 31 is mounted on the left side of the support 33. The impeller 31 has multiple blades evenly distributed circumferentially. When the airflow flows from left to right along the first cylindrical tube 1, the airflow impacts the blades of the impeller 31, driving the impeller 31 to rotate around its own axis. The impeller 31 typically has 6 to 12 blades, which can be made arc-shaped or twisted to better capture the kinetic energy of the airflow. A rotating shaft 32 is fixedly connected to the center of the right side of the impeller 31. The rotating shaft 32 is keyed to the impeller 31, and both rotate synchronously. The rotating shaft 32 passes through the middle of the support 33 to the right. A bearing is installed inside the support 33, allowing the rotating shaft 32 to rotate freely. After the right end of the rotating shaft 32 passes through the bracket 33, a drive gear 34 is fixed by a key connection. The axis of the drive gear 34 and the axis of the rotating shaft 32 are on the same straight line.

[0024] A secondary gear meshes with the front and rear sides of the driving gear 34, with the front being the first secondary gear 35 and the rear being the second secondary gear 36. Their axes are parallel to the axis of the driving gear 34. When the driving gear 34 rotates, the two secondary gears rotate in opposite directions. The rear side of the second secondary gear 36 meshes with the first driven gear 37. The axis of the first driven gear 37 is parallel to the axis of the second secondary gear 36. The right side of the first driven gear 37 is coaxially connected to the first disturbance structure 38. The first disturbance structure 38 is installed on the rear side of the inner wall of the first cylinder 1 and is responsible for disturbing the airflow in the rear area of ​​the duct. The front side of the first secondary gear 35 meshes with the second driven gear 39. The right side of the second driven gear 39 is coaxially connected to the second disturbance structure 310. The second disturbance structure 310 is installed on the front side of the inner wall of the first cylinder 1 and is responsible for disturbing the airflow in the front area of ​​the duct. The left end journals of the first driven gear 37 and the second driven gear 39 are respectively inserted into the two bearing seats on the bracket 33, and the bracket 33 provides rotational support.

[0025] The first disturbance structure 38 and the second disturbance structure 310 are identical in structure and size, and are arranged symmetrically inside the duct to ensure that the disturbance intensity of the airflow on both sides is the same, preventing flow deviation. A protective plate 311 is also installed on the right side of the drive gear 34. Two inserts extend from the left side of the protective plate 311, passing through the central holes of the first intermediate gear 35 and the second intermediate gear 36 respectively. The left end of the inserts is fixed to the bracket 33, allowing the intermediate gears to rotate freely on the inserts. The protective plate 311 protects and restricts the axial position of the three gears (drive gear 34, first intermediate gear 35, and second intermediate gear 36), preventing axial movement of the gears during high-speed rotation, and also preventing external debris from falling into the gear meshing area.

[0026] Taking the first disturbance structure 38 as an example, such as Figure 5 , Figure 6 and Figure 7 As shown, the first disturbance structure 38 consists of three parts: a base 381, a power assembly 382, ​​and a single-blade 383. The base 381 is an L-shaped connector, with its rear side attached to the rear side of the inner wall of the first cylinder 1 and secured with bolts. The front side of the base 381 is used to mount the power assembly 382. The power assembly 382 includes a horizontal frame 3821, the rear of which is fixedly connected to the base 381 with bolts. A portal frame 3822 is fixed to the left side of the top surface of the frame 3821. The portal frame 3822 is an inverted U-shaped frame consisting of two front and rear columns and a top crossbeam, which together with the frame 3821 form an installation space. A first bearing seat 3823 is installed at the lower part of the interior of the portal frame 3822, and the bottom of the first bearing seat 3823 is fixed to the frame 3821. A rolling bearing is installed inside the first bearing housing 3823. The rocker arm 3824 passes through the bearing and can rotate freely. Its left end extends from the left side of the portal frame 3822 and is fixedly connected to the right center of the first driven gear 37. The rocker arm 3824 and the first driven gear 37 rotate synchronously. A protrusion 38241 is fixed at an eccentric position on the right end face of the rocker arm 3824. The axis of the protrusion 38241 is not on the rotation axis of the rocker arm 3824, but is offset by a certain distance. The protrusion 38241 is inserted into a longitudinally formed slot inside the slotted rod 3825, and the protrusion 38241 can slide within the slot.

[0027] The grooved rod 3825 is a long, longitudinally placed rod. Its left top end inserts into and can rotate within the second bearing housing 3826, which is fixed to the center of the top crossbeam of the portal frame 3822. A fan-shaped toothed block 3827 is fixed to the right top end of the grooved rod 3825, with gear teeth machined on its curved edge. The lower part of the fan-shaped toothed block 3827 meshes with the gear rod 3828. The gear rod 3828 is a round rod with gear teeth on its outer circumference, passing through the third bearing housing 3829, which is fixed to the right side of the top surface of the carrier 3821. The gear rod 3828 can rotate freely within the third bearing housing 3829. The right end of the gear rod 3828 extends from the third bearing housing 3829 and is fixedly connected to the center of the slotted blade 383. The single-blade 383 is a long, thin plate whose length extends radially along the first tube 1, that is, perpendicular to the airflow direction.

[0028] The swing axis of the groove rod 3825 at the second bearing seat 3826 coincides with the rotation axis of the sector tooth block 3827. That is, when the groove rod 3825 swings around its top, the sector tooth block 3827 also swings around the same axis. The connecting axis of the rocker arm 3824 and the first driven gear 37 coincides with the axis of the gear rod 3828. Power transmission is achieved through the meshing of the sector tooth block 3827 and the gear rod 3828.

[0029] The dynamic rectifier mechanism 3 operates as follows: When the ventilation system is turned on, the airflow flows from left to right along the first cylinder 1, impacting the impeller 31, which then begins to rotate. Assuming the view from the right, the driving gear 34 rotates counter-clockwise. The counter-clockwise rotation of the driving gear 34 drives the first intermediate gear 35 on its front side to rotate clockwise, and simultaneously drives the second intermediate gear 36 on its rear side to rotate clockwise as well. Because the two intermediate gears are located on either side of the driving gear 34 and mesh with it, their directions of rotation are the same. The clockwise rotation of the first intermediate gear 35 drives the second driven gear 39 on its front side to rotate counter-clockwise, and the second driven gear 39 then drives the second disturbance structure 310. The clockwise rotation of the second intermediate gear 36 drives the first driven gear 37 on its rear side to rotate counter-clockwise, and the first driven gear 37 drives the first disturbance structure 38. Therefore, the first driven gear 37 and the second driven gear 39 rotate in the same direction, both counter-clockwise, so the first disturbance structure 38 and the second disturbance structure 310 operate synchronously.

[0030] Taking the first disturbance structure 38 as an example, the first driven gear 37 rotates the rocker arm 3824. The protrusion 38241 at the right end of the rocker arm 3824 performs circular motion while sliding within the groove of the slotted rod 3825. The continuous rotation of the rocker arm 3824 is converted into the reciprocating oscillation of the slotted rod 3825 around the axis of the second bearing seat 3826. The slotted rod 3825, along with the fan-shaped toothed block 3827, reciprocates. The fan-shaped toothed block 3827 drives the gear rod 3828 to reciprocate in both forward and reverse directions through meshing. The gear rod 3828 ultimately drives the slit blade 383 to oscillate back and forth, periodically changing its angle of attack and generating continuous disturbance to the airflow passing through the area. This disturbance causes the airflow at different locations on the cross-section of the wind tunnel to mix, combining high-velocity and low-velocity airflow, ultimately making the wind speed across the entire cross-section more uniform. When the system wind speed increases, the impeller 31 rotates faster, and the oscillation frequency of the slatted blades 383 also increases, automatically increasing the disturbance intensity. When the wind speed decreases, the disturbance intensity decreases accordingly. The entire process is driven entirely by the airflow itself, requiring no external power supply or controller.

[0031] like Figure 8 and Figure 9 As shown, the opening and closing door structure 4 includes a rectangular guard frame 41, which is embedded and fixed in an opening at the bottom of the second cylindrical tube 2. The outer periphery of the guard frame 41 fits against the edge of the opening and is firmly fixed with bolts and structural adhesive. A slide rail 42 is fixed horizontally on the inner rear wall of the guard frame 41. The slide rail 42 has a C-shaped cross-section. A slider 43 is mounted on the slide rail 42 and can slide freely in the left and right directions on the slide rail 42. The front side of the slider 43 is connected to the right side of the rear wall of the triangular bar 44 via a pivot. The triangular bar 44 can rotate relative to the slider 43 around this pivot. The triangular bar 44 is a triangular plate, and its base is fixedly connected to the base plate 45. The base plate 45 is a rectangular flat plate with a rubber sealing strip embedded around its outer periphery. When the base plate 45 is in the closed state, the sealing strip fits tightly against the inner wall of the guard frame 41, effectively preventing air leakage. A groove 451 is provided on the bottom right side of the base plate 45, which allows a person to pull the base plate 45 by using their fingers or a tool to hook it.

[0032] The rear wall of the triangular bar 44, near the right-side pivot, is connected to the lower end of a support rod 46 via the pivot. The upper rear side of the support rod 46 is inserted into a support block 47 and can rotate. The support block 47 is fixed to the rear side of the inner wall of the second cylinder 2. The support rod 46, the triangular bar 44, and the slider 43 constitute a linkage slider mechanism. A positioning seat 48 is fixed to the bottom left side of the guard frame 41. The positioning seat 48 has a positioning hole that runs through the front and back. A pin 49 passes through the positioning hole and can be moved back and forth. A sloping groove 411 is opened on the lower left side of the inner wall of the guard frame 41. The sloping groove 411 is recessed from the inner wall surface upwards. The left side of the triangular bar 44 is machined into a sloping surface. When the base plate 45 is flipped, the sloping surface can pass smoothly next to the sloping groove 411, avoiding collision between the triangular bar 44 and the guard frame 41.

[0033] The operation process of the opening and closing door structure 4 is as follows: When the ventilation duct is working normally, the base plate 45 is in the horizontal closed position, with the bottom surface of the base plate 45 flush with the bottom surface of the guard frame 41. The bottom of the entire second tube 2 is flat. The pin 49 protrudes forward from the positioning seat 48, and the top of the pin 49 presses against the left side of the bottom surface of the base plate 45, locking the base plate 45 to prevent it from opening due to vibration. When it is necessary to enter the ventilation duct for maintenance, first pull the pin 49 back to release the lock. Then, the operator puts their hand into the groove 451 at the bottom of the base plate 45 and pulls down the right side of the base plate 45. After the base plate 45 is pulled, it flips downward, and the triangular strip 44 rotates with the base plate 45 around the pivot on the slider 43. The inclined surface on the left side of the triangular strip 44 slides into the inclined groove 411. The whole process is very smooth and will not get stuck. Simultaneously, the support rod 46 rotates around the support block 47, and the slider 43 slides a distance to the left on the slide rail 42, providing compensation for the movement of the triangular bar 44; finally, the base plate 45 hangs completely below the bottom of the second cylinder 2, and the opening is fully opened, allowing maintenance personnel to enter the air duct through this opening. After maintenance, the operator pushes the base plate 45 upwards from below, causing the base plate 45 to flip upwards, and the slider 43 slides to the right along the slide rail 42 to reset, while the support rod 46 and triangular bar 44 also return to their original positions. After the base plate 45 is completely closed, the pin 49 is pushed forward again, with the top of the pin 49 pressing against the left side of the bottom surface of the base plate 45, locking the base plate 45 again.

[0034] In actual manufacturing, the first cylinder 1 and the second cylinder 2 are made of fiberglass, specifically industrial magnesium oxide, magnesium chloride solution, natural plant fibers, fiberglass cloth, and additives. Fiberglass has the advantages of being lightweight, high-strength, and corrosion-resistant, making it suitable for use in humid or ventilated environments containing corrosive gases. The driving gear 34, the first intermediate gear 35, the second intermediate gear 36, the first driven gear 37, and the second driven gear 39 in the gear system are all injection molded from engineering plastics such as polyoxymethylene or nylon 66, offering advantages such as self-lubrication and low noise. The sealing strip is made of silicone rubber extrusion molding, a material with good aging resistance, maintaining elasticity under long-term pressure.

[0035] During assembly, first assemble each component of the dynamic rectification mechanism 3 separately; fix the impeller 31 and the rotating shaft 32 together, and fix the driving gear 34 to the end of the rotating shaft 32; install the first intermediate rotating gear 35, the second intermediate rotating gear 36, the first driven gear 37, and the second driven gear 39 onto the corresponding positions on the bracket 33, and finally install the protective plate 311; install the first disturbance structure 38 and the second disturbance structure 310 onto the left and right sides of the bracket 33 respectively, so that the first driven gear 37 is connected to the rocker arm 3824 of the first disturbance structure 38, and the second driven gear 39 is connected to the rocker arm of the second disturbance structure 310. After the entire dynamic rectification mechanism 3 is assembled, place it inside the first cylinder 1 as a whole, and fix the bracket 33 to the inner wall of the first cylinder 1 with bolts.

[0036] The assembly of the opening and closing door structure 4 is carried out in the following order: First, fix the slide rail 42 to the inner rear wall of the guard frame 41, put the slider 43 on the slide rail 42, connect the triangular strip 44 and the slider 43 with the pivot, and then connect the two ends of the support rod 46 to the triangular strip 44 and the support block 47 respectively; fix the bottom plate 45 and the bottom of the triangular strip 44 together, and install the sealing strip on the outer periphery of the bottom plate 45; fix the positioning seat 48 to the bottom left side of the guard frame 41 and insert the pin 49; finally, embed the entire guard frame 41 into the opening at the bottom of the second cylinder 2 and fix it, and lock the support block 47 on the inner wall of the second cylinder 2. The first cylinder 1 and the second cylinder 2 are connected by flanges, a sealing gasket is placed between the two flanges, and the bolts are tightened evenly. At this point, the assembly of the entire air duct is completed.

[0037] In the above embodiments, the first duct 1 and the second duct 2 are only shown as examples of two duct sections. In actual applications, more duct sections can be added as needed based on the length of the ventilation duct. The number and shape of the blades of the impeller 31, as well as the gear ratio of each gear, can be adjusted according to the specific diameter of the duct and the design wind speed. Adjusting these parameters is a conventional design choice for those skilled in the art. The shape of the single-blade 383 is not limited to a flat plate. For example, it can be made into a slightly curved arc plate or a streamlined plate with an airfoil cross-section, which can achieve a similar turbulence effect.

[0038] In the description of this application, the terms "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for ease of description, not to indicate or imply that the device or element involved must have a specific orientation, or be constructed and operated in a specific orientation. The terms "connection," "fixing," "locking," and "setting" should be interpreted broadly, for example, referring to fixed connections, detachable connections, or integral connections; they can be direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

Claims

1. A fiberglass ventilation duct, comprising a first duct (1), wherein a second duct (2) is locked and fixed to the side of the first duct (1). Its features are: The first tube (1) has a dynamic rectification mechanism (3) locked inside. The second tube (2) has an opening and closing door structure (4) inside its bottom side. The dynamic rectification mechanism (3) includes an impeller (31). A rotating shaft (32) is coaxially fixed to the right side of the impeller (31). The rotating shaft (32) rotates through the middle side of the support (33). The front and rear sides of the support (33) are respectively fastened to the front and rear sides of the inner wall of the first tube (1). A drive gear (34) is fixedly connected to the right end of the rotating shaft (32). The front and rear sides of the drive gear (34) are respectively fastened to the front and rear sides of the inner wall of the first tube (1). The meshing transmission has a first intermediate gear (35) and a second intermediate gear (36). The second intermediate gear (36) has a first driven gear (37) meshing transmission on its rear side. The first driven gear (37) has a first disturbance structure (38) coaxially connected to its right side. The first intermediate gear (35) has a second driven gear (39) meshing transmission on its front side. The second driven gear (39) has a second disturbance structure (310) coaxially connected to its right side. The left central shaft of both the first driven gear (37) and the second driven gear (39) is rotatably connected to the bracket (33).

2. The fiberglass ventilation duct according to claim 1, characterized in that: The first tube (1) and the second tube (2) have the same structure, both consisting of a straight pipe section and a flange connected to the end of the straight pipe section.

3. The fiberglass ventilation duct according to claim 1, characterized in that: The drive gear (34) is provided with a protective plate (311) on the right side. The protective plate (311) has a pin on both the front and rear sides of the left side. The two pins pass through and rotate inside the first intermediate gear (35) and the second intermediate gear (36), and the left ends of the two pins are fixed to the bracket (33).

4. The fiberglass ventilation duct according to claim 1, characterized in that: The first disturbance structure (38) and the second disturbance structure (310) have the same structure and size, and are arranged symmetrically in the middle of the first tube (1).

5. The fiberglass ventilation duct according to claim 1, characterized in that: The first disturbance structure (38) includes a pad (381) that is locked and fixed to the inner wall of the first tube (1) on the rear side. A power assembly (382) is fixed to the front side of the pad (381). The left end of the power assembly (382) is coaxially connected to the right side of the first driven gear (37), and a blade (383) is locked to the right end of the power assembly (382).

6. The fiberglass ventilation duct according to claim 5, characterized in that: The power assembly (382) includes a frame (3821) that is fastened to the rear side of a pad (381). A portal frame (3822) is fixedly connected to the top left side of the frame (3821). A first bearing seat (3823) is provided in the lower middle part of the inner side of the portal frame (3822), and the bottom of the first bearing seat (3823) is fastened to the frame (3821). A rocker arm (3824) is rotatably inserted inside the first bearing seat (3823). The left end of the rocker arm (3824) is coaxially connected to a first driven gear (37), and the right side of the rocker arm (3824) is inserted and slidably inserted into a grooved rod (3825). 5) The top left end is inserted into the second bearing seat (3826) and rotates inside. The second bearing seat (3826) is fastened to the top middle side of the gate frame (3822). The top right end of the groove rod (3825) is locked with a fan-shaped tooth block (3827). The bottom of the fan-shaped tooth block (3827) meshes with a gear rod (3828). The gear rod (3828) rotates through the third bearing seat (3829). The third bearing seat (3829) is fastened to the top right side of the carrier (3821). The part of the gear rod (3828) extending out of the right side of the third bearing seat (3829) is coaxially connected to the blade (383).

7. The fiberglass ventilation duct according to claim 6, characterized in that: The groove rod (3825) has a longitudinally formed groove inside, and a protruding post (38241) is eccentrically provided on the right side of the rocker arm (3824). The protruding post (38241) is inserted and slides inside the groove.

8. The fiberglass ventilation duct according to claim 6, characterized in that: The axis at the connection between the groove rod (3825) and the second bearing seat (3826) coincides with the axis at the connection between the groove rod (3825) and the sector tooth block (3827); the axis at the connection between the rocker arm (3824) and the first driven gear (37) coincides with the axis of the gear rod (3828).

9. The fiberglass ventilation duct according to claim 1, characterized in that: The opening and closing door structure (4) includes a protective frame (41) embedded and fixed inside the bottom side of the second cylinder (2). A slide rail (42) is horizontally fixed to the rear wall of the inner side of the protective frame (41). A slider (43) is slidably connected to the front side of the slide rail (42). The front side of the slider (43) passes through and rotates to the right side of the rear wall of the triangular strip (44). The bottom of the triangular strip (44) is fixed to a base plate (45). A rod (46) is rotatably connected to the rear wall of the triangular strip (44) near the connection with the slider (43). A block (47) is inserted and rotated into the rear side of the top of the rod (46). The block (47) is fixed to the rear side of the inner wall of the second cylinder (2). A positioning seat (48) is fixed to the left side of the bottom of the protective frame (41). A pin (49) is provided inside the positioning seat (48). The base plate (45) is provided with a sealing strip on its outer periphery. When the base plate (45) is flipped to the top side, its bottom end face is flush with the bottom end face of the guard frame (41), and the bottom left side of the base plate (45) is in contact with the top of the pin (49).

10. A fiberglass ventilation duct according to claim 9, characterized in that: The bottom right side of the base plate (45) is provided with a groove (451) for flipping and opening the base plate (45); the lower left side of the inner wall of the guard frame (41) is provided with a slanted groove (411), and the left side of the triangular strip (44) is provided with a slanted surface to prevent interference with the movement path of the triangular strip (44).

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