Oblique flow type pipeline ventilator

Abstract

The invention is used for the technical field of pipeline ventilators, and discloses an oblique flow type pipeline ventilator which comprises a displacement frame, a displacement wheel is installed at the lower end of the displacement frame, a shell is installed on the inner side surface of the upper end of the displacement frame, a reinforcing mechanism is arranged on one side of fan blades, and the fan blades are fixed by controlling deformation of the fan blades to be matched with change of the rotating speed of the fan blades. The purpose of reducing energy consumption in the stable working stage of the power motor is achieved. According to the diagonal flow type pipeline ventilator, a sliding rod, a balancing weight and an abutting assembly in the reinforcing mechanism form a dynamic balance adjusting system, when a power motor drives fan blades to rotate at a high speed, the balancing weight slides towards the outer side along the sliding rod due to centrifugal force, and an abutting rod synchronously pushes an abutting plate to slide along a reinforcing rod and compress a spring; the deformation amplitude of the fan blades is limited through a reinforcing rod rigid supporting structure, when the ventilator enters a stable working stage, the rotating speed of the fan blades tends to be stable, rotating speed fluctuation can be more effectively resisted, and power input needed by dynamic adjustment of a power motor is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline ventilators, and particularly to an axial-flow pipeline ventilator. Background Art

[0002] In modern industrial production and building environments, axial-flow pipeline ventilators, with their advantages of large flow rate of axial fans and high pressure of centrifugal fans, are widely used in fields such as factory ventilation, building ventilation, and underground garage smoke exhaust. They play a crucial role in ensuring air circulation and optimizing environmental quality. According to statistics, in the ventilation systems of large industrial factories, the usage ratio of axial-flow pipeline ventilators is as high as over 60%. Their operating efficiency directly affects the energy consumption cost and production environment quality of enterprises. However, there are many problems to be solved urgently in the actual operation of existing axial-flow pipeline ventilators. In terms of the fan blade structure, when the fan blades of the ventilator rotate at high speed, they are extremely prone to uneven stress due to factors such as air flow impact and fatigue of their own materials, and then deform. Due to the fan blade deformation problem of traditional axial-flow ventilators, the ventilation efficiency drops by about 25% after running for a period of time, while the energy consumption of the power motor increases by 18%. This not only affects the air circulation effect in the factory building, but also greatly increases the operating cost of the enterprise. Moreover, the fan blade deformation may also cause vibration and noise, further shortening the service life of the ventilator and increasing the maintenance cost. In terms of air flow regulation, unstable air flow velocity inside the ventilator is another major problem. Most existing guide structures are designed with fixed angles and are difficult to adjust adaptively according to actual air flow changes. When the load of the ventilation system changes, such as the change in the density of people in a building or the fluctuation of air volume demand caused by the start and stop of industrial production equipment, the fixed guide structure cannot adjust the air flow direction in time, resulting in air flow disorder and vortex phenomenon. This situation is particularly obvious in the ventilation systems of high-rise buildings. The ventilation efficiency loss caused by air flow disorder will also cause additional impact on the components of the ventilator, accelerating equipment aging. In summary, developing an axial-flow pipeline ventilator that can accurately control fan blade deformation and adaptively adjust the guide structure according to air flow changes, thereby reducing energy consumption and improving the stability of internal air flow, has important practical significance for improving the performance of ventilation equipment and promoting energy conservation and emission reduction. Summary of the Invention

[0003] The purpose of the present invention is to provide an axial-flow pipeline ventilator to solve the problems raised in the above background art, namely, the fan blades are prone to uneven stress and deformation during high-speed rotation, resulting in a decrease in ventilation efficiency and an increase in the energy consumption of the power motor, and the existing guide structure cannot adjust adaptively according to air flow changes, resulting in air flow disorder inside the ventilator and accelerating equipment aging.

[0004] To achieve the above object, the present invention provides the following technical solution: An axial-flow pipe ventilator, including a displacement frame, a displacement wheel is installed at the lower end of the displacement frame, and a housing is installed on the inner surface of the upper end of the displacement frame. A protective net is fixedly arranged inside the side surface of one end of the housing. An installation frame is fixedly arranged inside the housing, and a power motor is fixedly connected to the upper end of the installation frame. A main switch is installed on the outer surface of one side of the housing. One end of the output shaft of the power motor is fixedly installed with a central disc, and a fan blade is fixedly arranged on the outer surface of the central disc. A reinforcement mechanism is arranged on one side of the fan blade, and by controlling the deformation of the fan blade and cooperating with the change of the rotation speed of the fan blade, the purpose of reducing the energy consumption during the stable operation stage of the power motor is achieved; The reinforcement mechanism includes: a reinforcement rod, the reinforcement rod is fixedly arranged on the outer surface of the fan blade, and a sliding rod is fixedly arranged on the outer surface of the fan blade on one side of the reinforcement rod. A sliding counterweight is installed on the outer surface of the sliding rod, and a fixed block is fixedly arranged on the outer surface of the fan blade on the side of the sliding rod away from the reinforcement rod. A contact rod is fixedly arranged on the outer surface of one side of the counterweight, and a sliding contact plate is installed on the side surface of the reinforcement rod opposite to the contact rod. A flow guide plate is arranged inside the housing, and the outer surface of the fixed block is penetrated by a limiting rod; An adaptive flow guide mechanism is arranged on the surface of the housing, and the stability of the air flow inside the ventilator is improved by adaptively adjusting the angle of the flow guide plate according to the change of the air flow velocity inside the housing; The adaptive flow guide mechanism includes: an installation box, the installation box is fixedly arranged on the outer surface of the housing, and a driving ring is arranged inside the installation box. An adjustment motor is fixedly installed inside the upper outer surface of the installation box. The flow guide plate is rotatably connected to the housing, and one end of the flow guide plate facing the outside of the housing penetrates the outer surface of the housing, and an adjustment gear is fixedly connected to one end of the flow guide plate facing the outside of the housing. An installation cylinder is fixedly arranged on the outer surface of the housing, and a downwardly arranged contact switch is fixedly arranged on the top surface inside the installation cylinder, and a sliding contact plate is installed on the bottom surface inside the installation cylinder.

[0005] Preferably, the counterweights and the fixed blocks are arranged in one-to-one correspondence. The fixed blocks are slidably connected to the limiting rods, and springs are connected between the fixed blocks and the limiting rods.

[0006] By adopting the above technical solution, the counterweight can stably slide on the sliding rod under the combined action of centrifugal force and spring force. The fixed block can limit the reset counterweight through the sliding connection with the limiting rod and the buffering of the spring, providing stable support for restricting the deformation of the fan blade and adjusting the center of gravity of the fan blade.

[0007] Preferably, one end of the limiting rod facing the counterweight is designed as a right trapezoid, and the inclined surface of the right trapezoid end of the limiting rod faces upward towards the counterweight. A groove is formed on the side surface of one end of the counterweight facing the limiting rod, and the counterweight is snap-fitted with the limiting rod through the groove.

[0008] With the above technical solution, when the rotational speed of the fan blade changes, the limiting rod can enable the counterweight to smoothly overcome the spring force and slide along the sliding rod under the action of centrifugal force to change its position. After the rotational speed of the fan blade stabilizes, the limiting rod can be re-snap-fitted with the groove of the counterweight under the action of the spring, accurately fixing the counterweight, maintaining the adjusted mass distribution of the fan blade, and ensuring that the energy consumption during the starting stage of the power motor will not increase.

[0009] Preferably, the outer surface of the contact plate facing the contact rod is in contact with the outer surface of the contact rod. One end of the contact plate slidably connected to the reinforcing rod is designed as a T shape, and a spring is connected between the contact plate and the reinforcing rod.

[0010] With the above technical solution, the contact plate is in contact with the contact rod, and the T-shaped design cooperates with the spring. When the counterweight slides, the contact rod can stably push the contact plate to slide along the reinforcing rod. The rigid support structure formed by the reinforcing rod and the contact plate effectively limits the deformation of the fan blade. The spring can buffer the force changes at different rotational speeds and assist the contact plate and the counterweight to reset when the rotational speed of the fan blade decreases, improving the reliability and stability of the reinforcement mechanism.

[0011] Preferably, the outer surface of the driving ring is in contact with the inner surface of the installation box, the inner surface of the driving ring is in contact with the outer surface of the housing, and a plurality of tooth blocks are uniformly and fixedly arranged on the outer surface of one side of the driving ring.

[0012] With the above technical solution, the driving ring is in close contact with the installation box and the housing, ensuring its stable rotation. The uniformly distributed tooth blocks provide conditions for reliable meshing with the adjusting gear, enabling the power of the adjusting motor to be stably transmitted to the guide vane, ensuring the stable operation of the adaptive flow guiding mechanism, and laying a foundation for the accurate adjustment of the angle of the guide vane.

[0013] Preferably, the lower end of the output shaft of the adjusting motor penetrates the inner surface of the housing, the lower end of the output shaft of the adjusting motor is fixedly connected to the uppermost adjusting gear, and the adjusting gear is meshed with the driving ring through the tooth blocks on the side surface of the driving ring.

[0014] With the above technical solution, the connection between the adjusting motor and the adjusting gear and the meshing transmission with the driving ring can enable the adjusting motor to drive a plurality of guide vanes to rotate synchronously, and the angles of each guide vane are adjusted uniformly, which can better match the real-time air flow velocity, effectively reduce eddy currents, improve the uniformity of the internal flow field of the ventilator, and enhance the ventilation effect.

[0015] Preferably, the lower end of the contact switch is in contact with the upper surface of the contact plate, and a spring is connected between the lower surface of the contact plate and the outer surface of the housing.

[0016] By adopting the above technical solution, the contact switch is fitted with the contact plate and connected with the spring, so that when the magnetic block approaches the contact plate, the contact plate can accurately separate from the contact switch and trigger the adjustment motor. The spring assists the contact plate to reset after the magnetic force disappears, ensuring that the adaptive guide mechanism responds accurately and reliably to changes in airflow velocity, thereby realizing automatic adjustment of the guide plate angle.

[0017] Preferably, a magnetic block is fixedly provided on the outer surface of the counterweight block arranged at one end of the sliding rod facing the outside of the shell.

[0018] By adopting the above technical solution, the magnetic block on the outer surface of the counterweight block at the end of the sliding rod converts the displacement of the counterweight block caused by the change of the fan blade speed into a magnetic signal, and triggers the contact switch to control the adjustment motor through the adsorption contact plate, thereby realizing the linkage between the reinforcement mechanism and the adaptive guide mechanism, so that the fan can automatically adjust the guide plate angle according to the changes in the fan blade speed and airflow velocity, thereby improving the overall adaptability and operating efficiency.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the diagonal flow duct fan: 1. The sliding rod, counterweight and resistance assembly in the reinforcement mechanism form a dynamic balance adjustment system. When the power motor drives the fan blades to rotate at high speed, the counterweight slides outward along the sliding rod due to centrifugal force, and its resistance rod simultaneously pushes the resistance plate to slide along the reinforcement rod and compresses the spring. The deformation amplitude of the fan blade is limited by the rigid support structure of the reinforcement rod. When the fan enters the stable working stage, the fan blade speed tends to be stable. At the same time, the movement of the counterweight makes the center of gravity of the fan blade move toward the tip of the fan blade. This process changes the mass distribution of the fan blade, so that the mass is more concentrated at the tip of the fan blade. With large moment of inertia and strong inertia, it can more effectively resist speed fluctuations, reduce the power input required for dynamic adjustment of the power motor, and is easier to maintain stability during use. 2. The adaptive guide mechanism is linked with the adjustment gear through the drive ring in the installation box to realize dynamic adjustment of the angle of the guide plate. When the magnetic block moves with the counterweight block and approaches the contact plate, it adsorbs the contact plate, so that the contact plate is separated from the trigger of the contact switch, and then the adjustment motor is started. The output shaft of the adjustment motor drives the top adjustment gear to rotate, and the gear block on the side surface of the drive ring is engaged and transmitted to synchronously adjust the angles of multiple guide plates to match the real-time airflow velocity, effectively reducing the generation of eddy currents and significantly improving the uniformity of the flow field inside the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention; Figure 2Schematic diagram of the three-dimensional structure of the connection between the housing, mounting bracket and power motor of the present invention; Figure 3 Schematic diagram of the three-dimensional structure of the overall sectional plane of the present invention; Figure 4 Schematic diagram of the three-dimensional structure of the sectional plane of the connection between the housing and the deflector of the present invention; Figure 5 Schematic diagram of the three-dimensional structure of the connection between the mounting bracket, power motor and central disk of the present invention; Figure 6 Schematic diagram of the three-dimensional structure of the connection between the fan blade, reinforcing rod and sliding rod of the present invention; Figure 7 Schematic diagram of the three-dimensional structure of the sectional plane of the connection between the reinforcing rod and the abutting plate of the present invention; Figure 8 For the present invention Figure 3 Enlarged structure diagram at position A in

[0021] In the figure: 1, displacement frame; 2, displacement wheel; 3, housing; 4, protective net; 5, mounting bracket; 6, power motor; 7, main switch; 8, central disk; 9, fan blade; 10, reinforcing rod; 11, sliding rod; 12, counterweight; 13, fixing block; 14, abutting rod; 15, abutting plate; 16, deflector; 17, mounting box; 18, driving ring; 19, adjusting motor; 20, adjusting gear; 21, mounting cylinder; 22, contact switch; 23, contact plate; 24, magnetic block; 25, limiting rod. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1-8 , the present invention provides a technical solution: an axial-flow pipe ventilator.

[0024] Embodiment 1: This embodiment discloses: a displacement frame 1, a displacement wheel 2 is installed at the lower end of the displacement frame 1, and a shell 3 is installed on the inner surface of the upper end of the displacement frame 1, a protective net 4 is fixedly arranged inside the side surface of one end of the shell 3, a mounting frame 5 is fixedly arranged inside the shell 3, and a power motor 6 is fixedly connected to the upper end of the mounting frame 5, a main switch 7 is installed on the outer surface of one side of the shell 3, a center disk 8 is fixedly installed at one end of the output shaft of the power motor 6, and a fan blade 9 is fixedly arranged on the outer surface of the center disk 8, and a reinforcement mechanism is arranged on one side of the fan blade 9, and the purpose of reducing the energy consumption of the power motor 6 in the stable working stage is achieved by controlling the deformation of the fan blade 9 and coordinating the change of the rotation speed of the fan blade 9; The reinforcement mechanism includes: a reinforcement rod 10, the reinforcement rod 10 is fixedly arranged on the outer surface of the fan blade 9, and a sliding rod 11 is fixedly arranged on the outer surface of the fan blade 9 on one side of the reinforcement rod 10, a sliding counterweight block 12 is installed on the outer surface of the sliding rod 11, and a fixed block 13 is fixedly arranged on the outer surface of the fan blade 9 on the side of the sliding rod 11 away from the reinforcement rod 10, a resistance rod 14 is fixedly arranged on the outer surface of one side of the counterweight block 12, and a sliding resistance plate 15 is installed on the side surface of the reinforcement rod 10 facing the resistance rod 14, a guide plate 16 is arranged inside the housing 3, and the outer surface of the fixed block 13 is penetrated by a limit rod 25; The counterweight block 12 and the fixed block 13 are arranged in a one-to-one correspondence, the fixed block 13 and the limit rod 25 are slidably connected, and a spring is connected between the fixed block 13 and the limit rod 25; The end of the limiting rod 25 facing the counterweight 12 is designed as a right-angled trapezoid, and the inclined surface of the right-angled trapezoidal end of the limiting rod 25 is arranged upwardly toward the counterweight 12. The side surface of the end of the counterweight 12 facing the limiting rod 25 is provided with a groove, and the counterweight 12 is mounted by engaging with the limiting rod 25 through the groove. The outer surface of the contact plate 15 facing the contact rod 14 is in contact with the outer surface of the contact rod 14, and one end of the contact plate 15 that is slidably connected to the reinforcement rod 10 is T-shaped, and a spring is connected between the contact plate 15 and the reinforcement rod 10; The oblique flow duct fan is placed at a location where ventilation is required. The displacement wheel 2 at the lower end of the displacement frame 1 facilitates the movement of the equipment. The equipment is turned on by the main switch 7. The power motor 6 is installed on the mounting frame 5, and the mounting frame 5 is fixed inside the shell 3. The protective net 4 is installed inside the side surface of one end of the shell 3 to prevent foreign matter from entering. The power motor 6 is started, and the output shaft drives the center disk 8 to rotate. The fan blades 9 on the outside of the center disk 8 rotate at high speed. When the fan blades 9 rotate, they are easily deformed due to uneven force due to factors such as airflow impact. At this time, the reinforcement rod 10 is fixed to the outer surface of the fan blade 9 to play a certain supporting role. The counterweight block 12 is installed on the outer surface of the sliding rod 11. As the rotational speed of the fan blade 9 increases, the limiting rod 25 on the surface of the fixed block 13 slides under the action of centrifugal force to stretch the spring and disengage from the engagement with the groove on the surface of the counterweight block 12. At this time, the counterweight block 12 slides outward along the sliding rod 11 under the action of centrifugal force. The counterweight block 12 squeezes the contact rod 14 against the contact plate 15, and the contact plate 15 slides along the reinforcing rod 10 until the contact plate 15 is limited by the chute on the surface of the reinforcing rod 10 and cannot slide; When the ventilator enters the stable working stage, the rotational speed of the fan blade 9 tends to be stable. The movement of the counterweight block 12 causes the center of gravity of the fan blade 9 to move towards the tip of the fan blade 9, changing the mass distribution of the fan blade 9, increasing the moment of inertia, enabling the fan blade 9 to more effectively resist rotational speed fluctuations, reducing the power input required for the dynamic adjustment of the power motor 6, and thus reducing energy consumption; When stopping work, the main switch 7 is turned off, the power motor 6 stops running, the rotational speed of the fan blade 9 gradually decreases. Under the action of the spring between the contact plate 15 and the reinforcing rod 10, the counterweight block 12 slides along the sliding rod 11 to reset. At this time, the counterweight block 12 squeezes the inclined surface of the limiting rod 25, causing the limiting rod 25 to slide under pressure until the limiting rod 25 returns to the engagement with the groove on the side surface of the counterweight block 12 under the support of the spring.

[0025] Embodiment 2: This embodiment discloses on the basis of Embodiment 1 that an adaptive flow guiding mechanism is provided on the surface of the housing 3, and the stability of the internal air flow of the ventilator is improved by adaptively adjusting the angle of the flow guiding plate 16 according to the change of the internal air flow velocity of the housing 3; The adaptive flow guiding mechanism includes: a mounting box 17, the mounting box 17 is fixedly arranged on the outer surface of the housing 3, and a driving ring 18 is arranged inside the mounting box 17. An adjusting motor 19 is fixedly installed inside the upper outer surface of the mounting box 17. The flow guiding plate 16 is rotatably connected to the housing 3, and one end of the flow guiding plate 16 facing the outside of the housing 3 penetrates the outer surface of the housing 3, and an adjusting gear 20 is fixedly connected to one end of the flow guiding plate 16 facing the outside of the housing 3. A mounting cylinder 21 is fixedly arranged on the outer surface of the housing 3, and a contact switch 22 arranged downward is fixedly arranged on the top surface inside the mounting cylinder 21, and a sliding contact plate 23 is installed on the bottom surface inside the mounting cylinder 21; The outer surface of the driving ring 18 is attached to the inner surface of the mounting box 17, and the inner surface of the driving ring 18 is attached to the outer surface of the housing 3, and a plurality of tooth blocks are uniformly fixedly arranged on one outer surface of the driving ring 18; The lower end of the output shaft of the adjusting motor 19 penetrates the inner surface of the housing 3, and the lower end of the output shaft of the adjusting motor 19 is fixedly connected to the uppermost adjusting gear 20, and the adjusting gear 20 is meshed with the driving ring 18 through the tooth blocks on the side surface of the driving ring 18; The lower end of the contact switch 22 is in contact with the upper surface of the contact plate 23, and a spring is connected between the lower surface of the contact plate 23 and the outer surface of the housing 3; A magnetic block 24 is fixedly arranged on the outer surface of the counterweight block 12 arranged at one end of the sliding rod 11 facing the outside of the housing 3; When the air flow velocity inside the housing 3 changes, the rotational speed of the fan blade 9 will change accordingly, which will cause the position of the counterweight block 12 to change. A magnetic block 24 is fixed on the outer surface of the counterweight block 12 arranged at one end of the sliding rod 11 facing the outside of the housing 3. The magnetic block 24 will move with the counterweight block 12. When the magnetic block 24 approaches the contact plate 23 in the mounting cylinder 21, the magnetic block 24 adsorbs the contact plate 23, and the contact plate 23 slides downward under the magnetic force and disengages from the contact with the contact switch 22, triggering the contact switch 22 and starting the adjustment motor 19 inside the side surface of the mounting box 17. The spring between the lower surface of the contact plate 23 and the outer surface of the housing 3 plays a role in buffering and assisting in resetting; After the adjustment motor 19 is started, the output shaft drives the adjustment gear 20 to rotate. The adjustment gear 20 drives the drive ring 18 to rotate through the tooth blocks on the side surface of the drive ring 18. The flow guide plate 16 is rotatably connected to the housing 3, and one end thereof facing the outside of the housing 3 penetrates the outer side surface of the housing 3 and is fixedly connected to the adjustment gear 20. When the drive ring 18 rotates, it drives the flow guide plate 16 to rotate through the adjustment gear 20, thereby realizing the dynamic adjustment of the angle of the flow guide plate 16 to match the real-time air flow velocity, reducing the generation of eddy currents, and improving the stability of the air flow inside the ventilator. When the air flow velocity is stable, the magnetic block 24 and the contact plate 23 maintain a relative position unchanged, and the flow guide plate 16 maintains the current angle. When the ventilator stops working and the air flow velocity is zero, the counterweight block 12 resets, the magnetic block 24 moves away from the contact plate 23, the contact plate 23 resets upward under the action of the spring, and the contact switch 22 returns to the initial state. At this time, the adjustment motor 19 drives the flow guide plate 16 to reset to the initial angle.

[0026] In the above specific embodiments, the purpose, technical solution, and beneficial effects of the present invention are further described in detail. It should be understood that the above are only specific embodiments of the present invention and do not limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. An oblique flow duct fan, comprising a displacement frame (1), a displacement wheel (2) being mounted at the lower end of the displacement frame (1), a housing (3) being mounted on the inner surface of the upper end of the displacement frame (1), a protective net (4) being fixedly mounted on the inner surface of one end of the housing (3), and characterized in that: A mounting frame (5) is fixedly arranged inside the housing (3), and a power motor (6) is fixedly connected to the upper end of the mounting frame (5); a main switch (7) is mounted on the outer surface of one side of the housing (3); a center disk (8) is fixedly arranged on one end of the output shaft of the power motor (6), and a fan blade (9) is fixedly arranged on the outer surface of the center disk (8); a reinforcement mechanism is arranged on one side of the fan blade (9); and the purpose of reducing the energy consumption of the power motor (6) in a stable working stage is achieved by controlling the deformation of the fan blade (9) in conjunction with the change in the rotation speed of the fan blade (9); The reinforcement mechanism comprises: a reinforcement rod (10), the reinforcement rod (10) being fixedly arranged on the outer surface of the fan blade (9), and a sliding rod (11) being fixedly arranged on the outer surface of the fan blade (9) on one side of the reinforcement rod (10), a sliding counterweight (12) being installed on the outer surface of the sliding rod (11), and a fixed block (13) being fixedly arranged on the outer surface of the fan blade (9) on the side of the sliding rod (11) away from the reinforcement rod (10), a resistance rod (14) being fixedly arranged on the outer surface of one side of the counterweight (12), and a sliding resistance plate (15) being installed on the side surface of the reinforcement rod (10) facing the resistance rod (14), a guide plate (16) being arranged inside the housing (3), and the outer surface of the fixed block (13) being penetrated by a limiting rod (25).

2. The oblique flow duct fan according to claim 1, characterized in that: An adaptive flow guide mechanism is provided on the surface of the outer shell (3), and the stability of the airflow inside the ventilator is improved by adaptively adjusting the angle of the flow guide plate (16) according to the change in the airflow velocity inside the outer shell (3).

3. The oblique flow duct fan according to claim 2, characterized in that: The adaptive flow guide mechanism comprises: a mounting box (17), the mounting box (17) being fixedly arranged on the outer surface of the housing (3), a driving ring (18) being arranged inside the mounting box (17), an adjusting motor (19) being fixedly arranged inside the outer surface of the upper end of the mounting box (17), the flow guide plate (16) being rotatably connected to the housing (3), an end of the flow guide plate (16) facing the outside of the housing (3) penetrating the outer surface of the housing (3), and an adjusting gear (20) being fixedly connected to the end of the flow guide plate (16) facing the outside of the housing (3), a mounting cylinder (21) being fixedly arranged on the outer surface of the housing (3), a contact switch (22) arranged downwardly being fixedly arranged on the inner top surface of the mounting cylinder (21), and a sliding contact plate (23) being installed on the inner bottom surface of the mounting cylinder (21).

4. The oblique flow duct fan according to claim 1, characterized in that: The counterweight block (12) and the fixed block (13) are arranged in a one-to-one correspondence, the fixed block (13) and the limiting rod (25) are slidably connected, and a spring is connected between the fixed block (13) and the limiting rod (25).

5. The oblique flow duct fan according to claim 1, characterized in that: One end of the limiting rod (25) facing the counterweight (12) is of right-angled trapezoidal design, and the inclined surface of one end of the limiting rod (25) is arranged upwardly toward the counterweight (12), and a groove is formed on the side surface of one end of the counterweight (12) facing the limiting rod (25), and the counterweight (12) is mounted by engaging with the limiting rod (25) through the groove.

6. The oblique flow duct fan according to claim 1, characterized in that: The outer surface of the abutment plate (15) facing the abutment rod (14) is in contact with the outer surface of the abutment rod (14), and one end of the abutment plate (15) slidably connected to the reinforcement rod (10) is designed in a T-shape, and a spring is connected between the abutment plate (15) and the reinforcement rod (10).

7. The oblique flow duct fan according to claim 3, characterized in that: The outer surface of the drive ring (18) fits with the inner surface of the mounting box (17), and the inner surface of the drive ring (18) fits with the outer surface of the housing (3), and a tooth block is evenly and fixedly provided on one side of the outer surface of the drive ring (18).

8. The oblique flow duct fan according to claim 3, characterized in that: The lower end of the output shaft of the adjusting motor (19) passes through the inner surface of the housing (3), and the lower end of the output shaft of the adjusting motor (19) is fixedly connected to the uppermost adjusting gear (20), and the adjusting gear (20) is meshedly connected to the driving ring (18) via a tooth block on the side surface of the driving ring (18).

9. The oblique flow duct fan according to claim 3, characterized in that: The lower end of the contact switch (22) is in contact with the upper surface of the contact plate (23), and a spring is connected between the lower surface of the contact plate (23) and the outer surface of the housing (3).

10. The oblique flow duct fan according to claim 1, characterized in that: A magnetic block (24) is fixedly arranged on the outer surface of a counterweight block (12) arranged at one end of the sliding rod (11) facing the outside of the housing (3).

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