Axial flow fan with rainproof and soundproof function

Abstract

The application discloses a roof axial flow fan with rainproof and noise reduction functions, and relates to the technical field of axial flow fans.The axial flow fan comprises a butt joint pipeline, a negative pressure fan installed on the inner wall of the butt joint pipeline, an exhaust pipe installed on the top of the butt joint pipeline and capable of rotating and adjusting the exhaust direction, and a side curved surface of the exhaust pipe is provided with a plurality of exhaust grooves which are distributed at equal angles, both sides of the exhaust grooves are provided with lightweight baffles capable of sensing airflow, the lightweight baffles can absorb longitudinal airflow and transverse airflow so as to weaken the reverse wind near the exhaust grooves, the inclined V-shaped partition plates and the dynamic rotating lightweight baffles are installed in the exhaust grooves, the airflow is sensed, sundries are blocked and the airflow is guided to the exhaust direction, the air resistance is reduced, the gas replacement efficiency is improved, the wind vane assembly is used for sensing strong wind and driving the exhaust pipe to turn to the leeward side, the high pressure head-on is avoided, the reverse wind pressure is avoided, the gas flow rate of the exhaust grooves is increased, and the exhaust efficiency is further improved.

Description

Technical Field

[0001] This invention relates to the field of axial flow fan technology, specifically to an axial flow fan with roof-mounted rainproof and noise-absorbing functions. Background Technology

[0002] Axial flow fans are ventilation devices that rely on the axial thrust generated by the blades on the airflow when the impeller rotates to make the gas flow axially. They are widely used in ventilation, cooling, and smoke extraction scenarios, such as building ventilation, industrial equipment heat dissipation, and air conditioning systems.

[0003] Currently, in buildings such as factories, warehouses, and residences, heat and moisture are generated due to personnel activities and equipment operation. Axial flow fans are installed on the roof to exhaust the indoor heat and moisture to the outside, keeping the indoor air dry and cool, reducing indoor humidity and temperature, and avoiding problems such as mold growth on items and rust on equipment caused by dampness and heat.

[0004] In actual operation, the exhaust structure of traditional roof axial flow fans is mostly fixed, such as the exhaust port or protective plate. Under good external conditions, the axial flow fan only needs to overcome the friction resistance of the gas in the duct and the positional resistance at the exhaust port. Therefore, in ventilation systems with low air pressure requirements, its operating energy consumption is relatively low, which can effectively reduce long-term operating costs.

[0005] However, under complex external environmental conditions, such as strong winds and severe weather like rain and snow, the efficiency of existing axial flow fans will decrease significantly due to the influence of external wind pressure, resulting in obvious limitations in terms of rain protection, drag reduction, noise reduction, and exhaust efficiency.

[0006] For example, when there is a small wind at the exhaust port, it will oppose the main airflow at the exhaust port. The cross airflow will carry impurities and rainwater into the exhaust channel and collide with the exhaust airflow, increasing exhaust resistance. When the longitudinal airflow is opposite to the exhaust direction, it will form reverse wind pressure, which will intensify exhaust turbulence and reduce exhaust efficiency.

[0007] Furthermore, when the external wind pressure is high, the exhaust duct is easily located in the high-pressure zone on the windward side, directly impacting the exhaust airflow and significantly increasing exhaust resistance. At this time, the high exhaust resistance, airflow impact, turbulence, and other phenomena will generate significant noise, reducing the stability of the fan operation and ventilation efficiency. It also exacerbates the risk of rain and snow directly entering the fan. Moreover, the natural wind direction is not fixed and may change multiple times in a short period of time. Traditional axial flow fans cannot monitor and continuously adjust the exhaust port direction in real time, causing the exhaust port to frequently be in a windward state, which cannot fundamentally solve the wind resistance problem.

[0008] To address the aforementioned issues, there is an urgent need for innovative designs based on existing axial flow fans. Summary of the Invention

[0009] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. Specifically, the purpose of the present invention is to provide an axial flow fan with rainproof and noise-absorbing functions for roofs, in order to solve the problem mentioned in the background that existing axial flow fans cannot automatically adjust the direction of the exhaust port according to the shape of natural wind and eliminate reverse wind resistance.

[0010] To achieve the above objectives, the present invention provides the following technical solution: an axial flow fan with rainproof and noise reduction function on the roof, including a connecting pipe and a negative pressure fan installed on the inner wall of the connecting pipe, and an exhaust pipe installed on the top of the connecting pipe that can rotate and adjust the exhaust direction, and the side curved surface of the exhaust pipe is provided with a plurality of exhaust slots distributed at equal angles, and lightweight baffles capable of sensing airflow are installed on both sides of the exhaust slots, and the lightweight baffles can absorb longitudinal airflow and transverse airflow to reduce the reverse wind resistance near the exhaust slots;

[0011] The top of the docking pipe is fixedly connected to a rain shield via a connecting rod, and the inner wall of the rain shield is rotatably connected to a wind vane assembly for driving the exhaust pipe to rotate.

[0012] Preferably, the inner wall of the exhaust groove is provided with a plurality of longitudinally arranged V-shaped baffles, and the V-shaped baffles are in an inclined state, with a gap between two adjacent V-shaped baffles;

[0013] Each of the V-shaped partitions is welded with a baffle plate, and the baffle plates on two adjacent V-shaped partitions are arranged in a staggered manner.

[0014] Preferably, the guide plate is divided into an outer guide plate and an inner guide plate. The central axis of the outer guide plate is parallel to the central axis of the V-shaped baffle, and the central axis of the inner guide plate is inclined toward the positions of the lightweight baffles on both sides.

[0015] Preferably, the lightweight baffle is provided with a plurality of longitudinally arranged first channels and second channels, which are alternately distributed from top to bottom, and the openings at the ends of the first channels and second channels correspond to the inner guide plates on both sides respectively.

[0016] Preferably, the wind vane assembly includes a shaft rotatably connected to the rain shield and a guide rod fixedly connected to the top of the shaft. The rain shield is located directly above the exhaust pipe, and the guide rod is located directly above the rain shield.

[0017] Preferably, the shaft has several guide tubes running through it, the guide tubes and the exhaust pipe are arranged in a vertical structure, one end of the guide tube extends to the position of the exhaust groove, and the other end of the guide tube extends to the outside of the exhaust pipe.

[0018] Preferably, the lightweight baffle and the exhaust channel are both concentrated on one side of the exhaust pipe. The direction of the airflow is sensed by the pointing rod and the shaft and guide pipe are rotated, which further causes the exhaust pipe to rotate synchronously to adjust the direction of the exhaust channel.

[0019] Preferably, the central axis of the connecting pipe coincides with the central axis of the exhaust pipe, and the connecting pipe and the exhaust pipe are interconnected, and sound insulation cotton is adhered to the inner wall of the connecting pipe.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] By installing inclined V-shaped baffles on the inner wall of the exhaust channel, and setting staggered guide plates on the V-shaped baffles, a physical barrier can be formed to block vertically falling or obliquely drifting rain and snow. When rain and snow pass through the gaps, they are intercepted by the guide plates or guided to slide to the outside. Lightweight baffles that can rotate freely are installed on both sides of the V-shaped baffles. The lightweight baffles can sensitively respond to the airflow and are driven to rotate by the airflow. When there is a light breeze, the surface of the lightweight baffles makes effective contact with the horizontally blowing airflow. The horizontal airflow blows the lightweight baffles to rotate towards the exhaust channel, partially blocking the side of the exhaust channel and forming a physical barrier. This can reduce the entry of rain, snow, dust and other debris carried by the horizontal airflow into the exhaust pipe, avoiding blockage or component damage. At the same time, it guides the horizontal airflow and absorbs some of the horizontal airflow, making the exhaust direction of the exhaust channel consistent, increasing the gas flow rate of the exhaust channel, and further improving the exhaust efficiency.

[0022] In addition, the lightweight baffle has alternating first and second channels from top to bottom. The first and second channels correspond one-to-one with the guide plates on both sides, connecting the airflow delivered by the guide plates to achieve one-to-one guiding cooperation. This forces a change in the longitudinal airflow direction, reduces the wind pressure of the longitudinal airflow, and guides the incoming longitudinal airflow to both sides, reducing the impact of the longitudinal airflow on the airflow of the negative pressure fan, reducing the turbulence resistance during exhaust, and allowing the airflow of the negative pressure fan to pass through the exhaust slot more smoothly. At the same time, the first and second channels absorb some of the longitudinal airflow, making the exhaust direction of the exhaust slot consistent, further improving the exhaust efficiency under complex wind conditions.

[0023] In addition, the wind vane component can automatically sense strong winds and drive the exhaust pipe to rotate, forcibly changing the orientation of the exhaust channel. This ensures that the exhaust channel always faces the leeward side when the wind speed is high, directly using the low-pressure ring on the leeward side to draw in the gas inside the exhaust pipe. This avoids the exhaust airflow colliding with the high pressure on the windward side, further ensuring the efficiency of indoor gas replacement. In scenarios where strong winds are accompanied by rain and snow, after the wind vane component drives the exhaust pipe to turn, combined with the top protection of the rain shield and the side shielding of the lightweight baffle, it can more accurately avoid the direction in which wind and rain directly impact the exhaust channel, reducing the risk of rain and snow directly entering through the exhaust channel, and further enhancing the protective performance of the device in severe weather. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0025] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0026] Figure 3 This is a schematic diagram of the connection structure between the exhaust pipe and the wind vane assembly of the present invention.

[0027] Figure 4 This is a schematic diagram of the exhaust pipe structure of the present invention.

[0028] Figure 5 This is a schematic diagram of the lightweight baffle structure of the present invention, which is driven by left and right crosswinds respectively.

[0029] Figure 6 This is a schematic diagram of the first and second channel structures of the present invention.

[0030] Figure 7 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0031] Figure 8 This is a schematic diagram of the structure in which the airflow of the present invention is introduced into the first channel and the second channel respectively.

[0032] In the diagram: 1. Connecting pipe; 2. Negative pressure fan; 3. Exhaust pipe; 4. Lightweight baffle; 401. First channel; 402. Second channel; 5. Exhaust trough; 501. V-shaped baffle; 502. Outer guide plate; 503. Inner guide plate; 6. Rain shield; 7. Wind vane assembly; 701. Shaft; 702. Pointing rod; 703. Guide pipe. Detailed Implementation

[0033] 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.

[0034] Please see Figures 1 to 8 The present invention provides a technical solution: an axial flow fan with rainproof and noise reduction function on the roof, including a connecting pipe 1, a negative pressure fan 2 installed on the inner wall of the connecting pipe 1, and an exhaust pipe 3 installed on the top of the connecting pipe 1 that can rotate and adjust the exhaust direction. The side curved surface of the exhaust pipe 3 is provided with a number of exhaust grooves 5 distributed at equal angles. Lightweight baffles 4 that can sense airflow are installed on both sides of the exhaust grooves 5. The lightweight baffles 4 can absorb longitudinal and transverse airflow to reduce the reverse wind resistance near the exhaust grooves 5.

[0035] The top of the connecting pipe 1 is fixedly connected to a rain shield 6 via a connecting rod, and the inner wall of the rain shield 6 is rotatably connected to a wind vane assembly 7 for driving the exhaust pipe 3 to rotate.

[0036] By installing freely rotatable lightweight baffles 4 on both sides of the exhaust duct 5, the lightweight baffles 4 can sensitively detect small airflows and be driven to rotate by the airflow. When there is a light breeze or a gentle breeze, the surface of the lightweight baffles 4 makes effective contact with the horizontally blowing airflow. The horizontal airflow blows the lightweight baffles 4 to rotate towards the exhaust duct 5, partially blocking the side of the exhaust duct 5 and forming a physical barrier. This can reduce the entry of rain, snow, dust and other debris carried by the horizontal airflow into the exhaust pipe 3, avoiding blockage or component damage.

[0037] In addition, the lightweight baffle 4 can not only change the airflow direction and reduce airflow collision, but also reduce exhaust resistance and help enhance exhaust efficiency by guiding the airflow to be consistent with the exhaust direction of the exhaust slot 5. Compared with the traditional fixed side baffle, the dynamically rotating lightweight baffle 4 can not only block rain, snow and impurities, but also further balance the influence of lateral airflow and longitudinal airflow, weaken wind resistance, and further improve exhaust efficiency.

[0038] In addition, the wind vane component 7 can automatically sense strong winds and drive the exhaust pipe 3 to rotate, forcibly changing the orientation of the exhaust channel 5 so that the exhaust channel 5 always faces the leeward side, effectively avoiding the high-pressure area on the windward side, significantly reducing the airflow resistance of the exhaust, improving the ventilation efficiency and operational stability of the negative pressure fan 2, further ensuring the efficiency of indoor gas replacement, and more accurately avoiding the direction of wind and rain directly impacting the exhaust channel 5, reducing the risk of rain and snow directly entering through the exhaust channel 5, and further enhancing the protective performance of the device in severe weather.

[0039] In this embodiment, as Figure 3 and Figure 4 As shown, the inner wall of the exhaust groove 5 is provided with several longitudinally arranged V-shaped baffles 501, and the V-shaped baffles 501 are in an inclined state, with gaps between two adjacent V-shaped baffles 501.

[0040] Each V-shaped baffle 501 is welded with a guide plate, and the guide plates on two adjacent V-shaped baffles 501 are arranged in a staggered manner.

[0041] In this embodiment, as Figure 7 As shown, the guide plate is divided into an outer guide plate 502 and an inner guide plate 503. The central axis of the outer guide plate 502 is parallel to the central axis of the V-shaped baffle 501, and the central axis of the inner guide plate 503 is inclined toward the positions of the two lightweight baffles 4.

[0042] It should be noted that by arranging several V-shaped baffles 501 longitudinally on the inner wall of the exhaust duct 5, and the V-shaped baffles 501 are inclined downwards, and gaps are left between adjacent baffles, a multi-stage guide can be formed for the exhaust airflow. This can guide the airflow to flow out smoothly along a preset path, and can also form a physical block for rain and snow that fall vertically or drift obliquely. When rain and snow pass through the gaps, they will be intercepted by the guide plate or guided to slide to the outside. This, combined with the protective function of the lightweight baffle 4, reduces the amount of rain and snow that directly enters the interior of the exhaust duct 5, and reduces the probability of rain and snow intruding into the exhaust pipe 3 and the connecting pipe 1.

[0043] Meanwhile, guides are installed on several V-shaped baffles 501. The guides of adjacent V-shaped baffles 501 are staggered. For example, if the guide of the first V-shaped baffle 501 is on the left, the guide of the second V-shaped baffle 501 is on the right. The staggered distribution allows the light airflow to be guided to both sides through the inner guide plate 503 of the guide plate. This guides the longitudinal airflow blowing in the face to both sides, reduces the impact of the longitudinal airflow on the airflow of the negative pressure fan 2, reduces the turbulence resistance during exhaust, and allows the airflow of the negative pressure fan 2 to pass through the exhaust slot 5 more smoothly, further improving the exhaust efficiency under complex wind conditions.

[0044] In addition, after being guided by the deflector and blocked by the V-shaped baffle 501, the intensity of the forward airflow is weakened, reducing the noise generated by the collision with the internal exhaust airflow, and further reducing the overall operating noise.

[0045] In this embodiment, as Figure 6 As shown, the lightweight baffle 4 is provided with a number of longitudinally arranged first channels 401 and second channels 402. The first channels 401 and second channels 402 are alternately distributed from top to bottom, and the openings at the ends of the first channels 401 and second channels 402 correspond to the inner guide plates 503 on both sides respectively.

[0046] It should be noted that the first channel 401 and the second channel 402 are connected to the inner guide plates 503 of the V-shaped partitions 501 on both sides by several longitudinally arranged first channels 401 and second channels 402 respectively. Since the first channel 401 and the second channel 402 are alternately distributed from top to bottom and their end openings correspond to the inner guide plates 503 on both sides respectively, they can smoothly connect with the airflow guided by the inner guide plates 503, avoiding airflow turbulence at this point. In addition, the end openings of the first channel 401 and the second channel 402 face opposite directions. For example, when the first channel 401 and its end opening face to the left, the end opening of the second channel 402 faces to the right.

[0047] In this embodiment, as Figure 7 and Figure 8As shown, the arrows represent the airflow direction. When the wind blows from the front, it generates longitudinal wind resistance. The longitudinal airflow is split by the outer guide plate 502 and the inner guide plate 503 and guided to both sides respectively. The first channel 401 corresponds to the inner guide plate 503 on the left and connects with the airflow guided by the inner guide plate 503 on the left. The airflow can be directly discharged along the first channel 401.

[0048] Similarly, the second channel 402 corresponds to the inner guide plate 503 on the right side, connecting with the airflow guided by the inner guide plate 503 on the right side to achieve one-to-one guiding cooperation, forcibly changing the longitudinal airflow direction, reducing the wind pressure of the longitudinal airflow, and through the alternating distribution of the first channel 401 and the second channel 402, avoiding the cross-flow of lateral airflow on both sides, preventing airflow turbulence, making the airflow organization of the entire exhaust system more orderly, maintaining efficient operation even under complex wind conditions, and reducing additional noise and resistance caused by airflow turbulence;

[0049] In addition, in this embodiment, when the wind blows laterally from the left and right sides and there is no longitudinal airflow, the surface of the lightweight baffle 4 makes effective contact with the laterally blowing airflow. The lateral airflow blows the lightweight baffle 4 to rotate towards the exhaust groove 5, partially blocking the side of the exhaust groove 5. At the same time, the first channel 401 and the second channel 402 can guide the lateral airflow to change direction, so that the exhaust direction of the exhaust groove 5 is consistent. The lateral airflow drives the gas flow rate of the exhaust groove 5, which can improve the blocking effect and assist the exhaust.

[0050] In this embodiment, as Figure 1 and Figure 3 As shown, the wind vane assembly 7 includes a shaft 701 rotatably connected to the rain shield 6, and a guide rod 702 fixedly connected to the top of the shaft 701. The rain shield 6 is located directly above the exhaust pipe 3, and the guide rod 702 is located directly above the rain shield 6.

[0051] The shaft 701 has several guide tubes 703 running through its interior. The guide tubes 703 and the exhaust pipe 3 are arranged in a vertical structure. One end of the guide tube 703 extends to the position of the exhaust groove 5, and the other end of the guide tube 703 extends to the outside of the exhaust pipe 3.

[0052] The lightweight baffle 4 and the exhaust groove 5 are both concentrated on one side of the exhaust pipe 3. The direction of the wind is sensed by the pointing rod 702 and the shaft 701 and the guide pipe 703 are rotated, which further causes the exhaust pipe 3 to rotate synchronously to adjust the direction of the exhaust groove 5.

[0053] It should be noted that the shaft 701 of the wind vane assembly 7 is rotatably connected to the rain shield 6. The rain shield 6 is fixedly connected to the docking pipe 1 through the connecting rod. The position of the rain shield 6 is fixed and always located directly above the exhaust pipe 3, which shields the top of the exhaust pipe 3 to avoid the impact of heavy rain. The pointing rod 702 can flexibly respond to changes in wind direction. The pointing rod 702 is located directly above the rain shield 6 and will not be blocked by the rain shield 6. It can accurately capture the prevailing wind direction and drive the exhaust pipe 3 to rotate.

[0054] Specifically, when encountering strong winds, a high-pressure zone is formed on the front and a low-pressure zone is formed on the back. The pointer rod 702 senses the strong wind and rotates to adjust its direction. The arrow of the pointer rod 702 is opposite to that of the exhaust chute 5. The pointer rod 702 is driven to rotate by the wind force, and the arrow of the pointer rod 702 points in the wind direction, which drives the shaft rod 701 to rotate. The shaft rod 701 drives the guide pipe 703 to rotate, which in turn drives the exhaust pipe 3 to rotate, ensuring that the exhaust chute 5 always faces the leeward side, avoiding direct contact between the exhaust chute 5 and the strong wind, and avoiding reverse wind pressure.

[0055] Meanwhile, by adding a guide pipe 703, the air outlet of the guide pipe 703 points to the exhaust trough 5, and the external air inlet of the guide pipe 703 is set as a horn mouth. The external wind force is collected through the guide pipe 703, and the airflow can be directly introduced into the vicinity of the exhaust trough 5 through the guide pipe 703 and is consistent with the gas flow direction of the exhaust trough 5, thereby increasing the gas flow rate of the exhaust trough 5 and further assisting gas replacement.

[0056] The exhaust duct 5 is rotated synchronously by the exhaust assembly, so that when the wind speed is high, the exhaust duct 5 always faces the leeward side. It directly uses the low-pressure ring on the leeward side to draw gas from the exhaust pipe 3, avoiding the exhaust airflow from colliding with the high pressure on the windward side. This not only avoids reverse wind pressure, but also uses the external wind force to accelerate the internal gas replacement. In the scenario of strong wind accompanied by rain and snow, after the wind vane assembly 7 drives the exhaust pipe 3 to turn, it combines the top protection of the rain shield 6 and the side shielding of the lightweight baffle 4.

[0057] In this embodiment, as Figure 1 and Figure 2 As shown, the central axis of the connecting pipe 1 coincides with the central axis of the exhaust pipe 3, and the connecting pipe 1 and the exhaust pipe 3 are interconnected. Furthermore, sound insulation cotton is adhered to the inner wall of the connecting pipe 1.

[0058] It should be noted that the central axis of the connecting pipe 1 and the exhaust pipe 3 are designed to coincide, ensuring that the airflow does not deflect during the conversion process, reducing local eddies and pressure fluctuations, reducing ventilation resistance, and improving the energy efficiency ratio of the negative pressure fan 2. The sound insulation cotton is directly bonded to the inner wall of the connecting pipe 1 and is located in the operating area of ​​the negative pressure fan 2, which can effectively absorb mechanical vibration noise and airflow friction noise.

[0059] Working principle: When using this axial flow fan with rainproof and noise reduction function, firstly, connect the connecting pipe 1 to the roof exhaust pipe and start the negative pressure fan 2. After the negative pressure fan 2 starts, the indoor air enters the exhaust pipe 3 through the connecting pipe 1, forming an axial airflow port. Under natural conditions with no wind and no rain, the air is discharged to the outside through the exhaust groove 5 on the side curved surface of the exhaust pipe 3, blowing open the lightweight baffle 4. At this time, the lightweight baffle 4 is in a naturally expanded state, and the internal and external air replacement begins.

[0060] Next, the lightweight baffle 4 and the wind vane assembly 7 sense the wind speed and direction, and adjust the exhaust duct 5 accordingly. Specifically, this is done in the following two ways:

[0061] 1. The external wind pressure is too high, preventing the triggering of the wind vane component 7:

[0062] If the wind direction is a horizontal wind, the lightweight baffle 4 is pushed to rotate by the horizontal airflow and tilts towards the exhaust chute 5 to further block the exhaust chute 5 and form a side baffle. The horizontal airflow is guided to the front end of the lightweight baffle 4 through the first channel 401 or the second channel 402 on its surface.

[0063] If the wind direction is longitudinal and opposite to the exhaust direction of the exhaust chute 5, the airflow will blow vertically toward the V-shaped baffle 501. Guided by the outer guide plate 502 and the inner guide plate 503 on the surface of the V-shaped baffle 501, the airflow flows toward the first channel 401 and the second channel 402 on both sides, respectively, to achieve directional guidance. Through the first channel 401 and the second channel 402, a portion of the longitudinal airflow is absorbed and forcibly turned, directly guiding it to be consistent with the exhaust direction of the exhaust chute 5, increasing the flow velocity of the exhaust chute 5, reducing the reverse wind resistance, and assisting in exhaust.

[0064] I. High external wind pressure triggers the wind vane component 7:

[0065] When the wind pressure is high, the pointing rod 702 of the wind vane assembly 7 is exposed to the outside airflow and rotates under the wind force. The arrow always points to the wind direction. The rotation of the pointing rod 702 drives the shaft 701 to rotate, and through the shaft 701, it drives the exhaust pipe 3 to rotate synchronously, so that the exhaust slot 5 and the lightweight baffle 4 always face the leeward side, avoiding direct confrontation with the strong wind.

[0066] Meanwhile, the guide pipe 703 uses the wind-gathering effect of the horn mouth to collect the outside wind and introduces it into the exhaust slot 5 so that it overlaps with the main exhaust airflow in the same direction. The outside wind energy is used to assist in gas replacement and reduce the energy consumption of the fan.

[0067] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An axial flow fan with roof-mounted rainproof and noise-absorbing functions, comprising a connecting pipe (1) and a negative pressure fan (2) installed on the inner wall of the connecting pipe (1), characterized in that: It also includes an exhaust pipe (3) installed on the top of the docking pipe (1) that can rotate and adjust the exhaust direction, and the side curved surface of the exhaust pipe (3) is provided with several exhaust grooves (5) distributed at equal angles. Both sides of the exhaust groove (5) are equipped with lightweight baffles (4) that can sense airflow, and the lightweight baffles (4) can absorb longitudinal airflow and transverse airflow to reduce the reverse wind resistance near the exhaust groove (5). The top of the docking pipe (1) is fixedly connected to a rain shield (6) by a connecting rod, and the inner wall of the rain shield (6) is rotatably connected to a wind vane assembly (7) for driving the exhaust pipe (3) to rotate. The inner wall of the exhaust groove (5) is provided with a number of longitudinally arranged V-shaped baffles (501), and the V-shaped baffles (501) are in an inclined state, with a gap between two adjacent V-shaped baffles (501); Each of the V-shaped baffles (501) is welded with a guide plate, and the guide plates on two adjacent V-shaped baffles (501) are arranged in a staggered manner. The guide plate is divided into an outer guide plate (502) and an inner guide plate (503). The central axis of the outer guide plate (502) is parallel to the central axis of the V-shaped baffle (501), and the central axis of the inner guide plate (503) is inclined toward the positions of the two lightweight baffles (4). The lightweight baffle (4) is provided with a plurality of longitudinally arranged first channels (401) and second channels (402). The first channels (401) and second channels (402) are alternately distributed from top to bottom, and the openings at the ends of the first channels (401) and second channels (402) correspond to the inner guide plates (503) on both sides respectively. The wind vane assembly (7) includes a shaft (701) rotatably connected to the rain shield (6) and a guide rod (702) fixedly connected to the top of the shaft (701). The rain shield (6) is located directly above the exhaust pipe (3), and the guide rod (702) is located directly above the rain shield (6). The shaft (701) has several guide tubes (703) running through its interior. The guide tubes (703) and the exhaust pipe (3) are arranged in a vertical structure. One end of the guide tube (703) extends to the position of the exhaust groove (5), and the other end of the guide tube (703) extends to the outside of the exhaust pipe (3). The lightweight baffle (4) and the exhaust groove (5) are both concentrated on one side of the exhaust pipe (3). The direction of the wind is sensed by the pointing rod (702) and the shaft (701) and the guide pipe (703) are rotated, which further causes the exhaust pipe (3) to rotate synchronously, so as to adjust the direction of the exhaust groove (5).

2. An axial flow fan with rainproof and noise-absorbing functions on the roof according to claim 1, characterized in that: The central axis of the connecting pipe (1) coincides with the central axis of the exhaust pipe (3), and the connecting pipe (1) and the exhaust pipe (3) are interconnected. Sound insulation cotton is adhered to the inner wall of the connecting pipe (1).

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