Roof axial flow fan with rainproof and silencing functions

Abstract

The invention discloses a roof axial flow fan with rainproof and silencing functions, and relates to the technical field of axial flow fans, the roof axial flow fan comprises a butt joint pipeline and a negative pressure fan mounted on the inner wall of the butt joint pipeline, and further comprises an exhaust pipe mounted at the top of the butt joint pipeline and capable of rotating and adjusting the exhaust direction, a plurality of exhaust grooves distributed at equal angles are formed in the side curved surface of the exhaust pipe, light baffles capable of sensing airflow are installed on the two sides of each exhaust groove, and the light baffles can absorb longitudinal airflow and transverse airflow so as to weaken reverse wind near the exhaust grooves; the inclined V-shaped partition plate and the dynamic rotating light baffle are installed in the exhaust groove, airflow is sensed to shield sundries and guide the airflow to the exhaust direction, wind resistance is reduced, the gas replacement efficiency is improved, the weather vane assembly is used for sensing strong wind to drive the exhaust pipe to rotate to the leeward side, high-pressure opposite impact is avoided, reverse wind pressure is avoided, and meanwhile the gas flow speed of the exhaust groove is increased; and the exhaust efficiency is further improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of axial flow fans, in particular to an axial flow fan with rainproof and noise reduction functions on a roof. BACKGROUND

[0002] An axial flow fan is a ventilation equipment relying on the axial thrust generated by the blades on the airflow when the impeller rotates, so that the gas flows along the axial direction, and is widely applied to scenes such as ventilation, cooling, smoke exhaust, building ventilation, industrial equipment heat dissipation, air conditioning systems and the like.

[0003] At present, in factories, warehouses, residential buildings and the like, heat and humidity are generated due to personnel activities and equipment operation, and an axial flow fan is installed on the roof to exhaust indoor heat and humidity to the outdoor, so that the indoor air is kept dry and cool, the humidity and temperature in the indoor are reduced, and problems such as mildew of articles and rust of equipment caused by damp and hot are avoided.

[0004] In actual operation, the exhaust structure of the traditional roof axial flow fan is mostly fixed design, such as an exhaust port or a protective plate, most of which are fixed and cannot move. In the case that the external environment is good, the axial flow fan only needs to overcome the resistance of the gas in the pipeline and the resistance at the position of the exhaust port, so that in the ventilation system with low wind pressure demand, the operation energy consumption is relatively low, and the long-term use cost can be effectively reduced.

[0005] However, in the case that the external environment is complex, such as strong wind, rain and snow and the like, the efficiency of the existing axial flow fan will be obviously reduced due to the influence of the external wind pressure, which obviously limits the rainproof, resistance reduction, noise reduction and exhaust efficiency and the like.

[0006] For example, when there is a small wind force at the position of the exhaust port, the transverse airflow will carry impurities and rainwater into the exhaust groove and form a head-on collision with the exhaust airflow, thereby increasing the exhaust resistance. When the longitudinal airflow is opposite to the exhaust direction, the reverse wind pressure will be formed, which will intensify the exhaust turbulence and reduce the exhaust efficiency.

[0007] In addition, when the external wind pressure is large, the exhaust groove is easy to be in the high pressure area of the windward surface and directly collides with the exhaust airflow, which significantly increases the exhaust resistance. At this time, the exhaust resistance is large, and the airflow collision and turbulence will produce a large noise, which reduces the operation stability and ventilation efficiency of the fan, and intensifies the risk of direct rain and snow pouring. Moreover, the natural wind direction is not fixed and can change many times in a short time. The traditional axial flow fan cannot monitor and continuously adjust the direction of the exhaust port in real time, so that the exhaust port is frequently in the windward state, and the wind resistance problem cannot be fundamentally solved.

[0008] In view of the above problems, it is urgent to make an innovative design on the basis of the original axial flow fan. SUMMARY

[0009] The technical scheme of the present application aims at the technical problem that the prior art solution is too single, and provides a solution significantly different from the prior art, and specifically aims to provide an axial flow fan with rainproof and noise reduction functions on a roof to solve the problem that the prior art axial flow fan cannot automatically control the direction of the exhaust port according to the form of natural wind and eliminate reverse wind resistance.

[0010] To achieve the above object, the present application provides the following technical scheme: an axial flow fan with rainproof and noise reduction functions on a roof, comprising a butt joint pipe and a negative pressure fan installed on the inner wall of the butt joint pipe, further comprising an exhaust pipe installed on the top of the butt joint pipe and capable of rotating and adjusting the direction of the exhaust port, and the side curved surface of the exhaust pipe is provided with a plurality of exhaust grooves distributed at equal angles, both sides of the exhaust grooves are provided with lightweight baffles capable of sensing airflow, and the lightweight baffles can absorb longitudinal airflow and transverse airflow to weaken the reverse wind resistance near the exhaust grooves.

[0011] The top of the butt joint pipe is fixedly connected with a rain shield through a connecting rod, and the inner wall of the rain shield is rotatably connected with 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 partitions, and the V-shaped partitions are in an inclined state, and there is a gap between adjacent two V-shaped partitions.

[0013] A guide vane is welded on each V-shaped partition, and the guide vanes on adjacent two V-shaped partitions are arranged in a left-right staggered manner.

[0014] Preferably, the guide vanes are divided into outer guide vanes and inner guide vanes, the outer guide vanes are parallel to the V-shaped partitions, and the inner guide vanes are inclined towards the positions of the two lightweight baffles.

[0015] Preferably, a plurality of first channels and second channels are arranged on the lightweight baffles in a longitudinal arrangement, the first channels and the second channels are alternately distributed from top to bottom, and the openings at the ends of the first channels and the second channels correspond to the inner guide vanes on both sides, respectively.

[0016] Preferably, the wind vane assembly comprises a shaft rotatably connected with the rain shield, and a pointing rod fixedly connected with the top end of the shaft, the rain shield is arranged directly above the exhaust pipe, and the pointing rod is arranged directly above the rain shield.

[0017] Preferably, a plurality of guide pipes are arranged inside the shaft, the guide pipes and the exhaust pipe are arranged in a vertical structure, one end of the guide pipe extends to the position of the exhaust groove, and the other end of the guide pipe extends to the outside of the exhaust pipe.

[0018] Preferably, the light baffle and the exhaust groove are arranged on one side of the exhaust pipe, and the wind direction is sensed by the pointing rod to drive the shaft and the flow guide pipe to rotate, further driving the exhaust pipe to rotate synchronously to adjust the direction of the exhaust groove.

[0019] Preferably, the central axis of the connecting pipeline coincides with the central axis of the exhaust pipe, and the connecting pipeline and the exhaust pipe are in communication with each other, and the inner wall of the connecting pipeline is bonded with sound insulation cotton.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] By installing the inclined V-shaped partition plate on the inner wall of the exhaust groove and arranging the staggered guide plates on the V-shaped partition plate, the vertically falling or obliquely floating rain and snow can be physically blocked, and the rain and snow can be intercepted or guided to the outside by the guide plates when passing through the gap. The light baffle on both sides of the V-shaped partition plate can rotate freely, and the light baffle can sensitively sense the airflow and be driven to rotate by the airflow. When there is a breeze or a light wind, the surface of the light baffle forms effective contact with the transversely blowing airflow, and the light baffle is blown by the transversely blowing airflow to rotate towards the direction of the exhaust groove, partially shielding the side of the exhaust groove, forming a physical barrier, and reducing the rain, snow and dust carried by the transversely blowing airflow into the exhaust pipe, avoiding blockage or damage to the components. At the same time, the transversely blowing airflow is guided and part of the transversely blowing airflow is absorbed, so that the exhaust direction of the exhaust groove is consistent, and the gas flow rate of the exhaust groove is driven, further improving the exhaust efficiency.

[0022] In addition, the first channel and the second channel are alternately distributed on the light baffle from top to bottom, and the first channel and the second channel correspond to the guide plates on both sides one by one, link the guide plates to convey the airflow, realize one-to-one guiding cooperation, forcibly change the direction of the longitudinal airflow, reduce the wind pressure of the longitudinal airflow, guide the head-on blowing longitudinal airflow to both sides respectively, reduce the influence of the longitudinal airflow on the negative pressure fan, reduce the turbulent resistance during exhaust, make the airflow of the negative pressure fan pass through the exhaust groove more smoothly, and at the same time, part of the longitudinal airflow is absorbed through the first channel and the second channel, so that the exhaust direction of the exhaust groove is consistent, further improving the exhaust efficiency under complex wind conditions.

[0023] In addition, the wind vane assembly can automatically sense strong wind and drive the exhaust pipe to rotate, forcibly changing the orientation of the exhaust groove, so that the exhaust groove always faces the leeward side when the wind speed is large, directly using the low pressure ring on the leeward side to suck the gas in the exhaust pipe, avoiding the collision of the exhaust airflow and the windward high pressure, further ensuring the efficiency of indoor gas replacement. In the scene of strong wind accompanied by rain and snow, after the wind vane assembly drives the exhaust pipe to turn, combined with the top protection of the rain shield and the lateral shielding of the light baffle, the direction of the rain and snow directly impacting the exhaust groove can be more accurately avoided, the risk of rain and snow directly pouring through the exhaust groove is reduced, and the protection performance of the device in bad weather is further enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the whole structure schematic diagram of the application.

[0025] Figure 2 It is the whole structure schematic diagram of the application.

[0026] Figure 3 It is the exhaust pipe and wind vane assembly connection structure schematic diagram of the application.

[0027] Figure 4 It is the exhaust pipe structure schematic diagram of the application.

[0028] Figure 5 It is the left and right horizontal wind driven structure schematic diagram of the application.

[0029] Figure 6 It is the first channel and second channel structure schematic diagram of the application.

[0030] Figure 7 It is the whole structure schematic diagram of the application. Figure 4 It is the enlarged structure schematic diagram of A in the application.

[0031] Figure 8 It is the air flow introduced into the first channel and second channel structure schematic diagram of the application.

[0032] In the figure: 1, butt joint pipeline; 2, negative pressure fan; 3, exhaust pipe; 4, light baffle; 401, first channel; 402, second channel; 5, exhaust groove; 501, V-shaped partition; 502, outer guide plate; 503, inner guide plate; 6, rain shield; 7, wind vane assembly; 701, shaft; 702, pointing rod; 703, flow guide pipe. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the application.

[0034] Please refer to Figures 1 to 8 The application provides a kind of technical solutions: a roof has rainproof sound-absorbing function axial flow fan, including butt joint pipeline 1, and negative pressure fan 2 installed on the inner wall of butt joint pipeline 1, further including the exhaust pipe 3 of being able to rotate and adjusting exhaust direction installed at the top of butt joint pipeline 1, and the side curved surface of exhaust pipe 3 is provided with several equal angle distribution exhaust grooves 5, the both sides of exhaust groove 5 are equipped with light baffle 4 that can induct air flow, and light baffle 4 can absorb longitudinal air flow and transverse air flow, to weaken the reverse wind resistance near exhaust groove 5.

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

[0036] By installing the lightweight baffle 4 capable of freely rotating on both sides of the exhaust groove 5, the lightweight baffle 4 can sensitively respond to the slight airflow and be driven to rotate by the airflow. When there is a slight wind or a small wind, the plate surface of the lightweight baffle 4 forms effective contact with the airflow blowing transversely, blows the lightweight baffle 4 to rotate in the direction of the exhaust groove 5 through the transverse airflow, and partially shields the side of the exhaust groove 5 to form a physical barrier, which can reduce the rain, snow, dust and other sundries carried by the transverse airflow into the inside of the exhaust pipe 3, and avoid blockage or damage to the components;

[0037] In addition, the lightweight baffle 4 not only can change the airflow direction and reduce the airflow impact, but also can guide the airflow to be consistent with the exhaust direction of the exhaust groove 5, reduce the exhaust resistance, and assist in enhancing the exhaust efficiency. Compared with the traditional fixed side baffle, the dynamic rotating lightweight baffle 4 can not only shield rain, snow and impurities, but also further balance the influence of the transverse airflow and the longitudinal airflow, weaken the wind resistance, and further improve the exhaust efficiency;

[0038] In addition, the wind vane assembly 7 can automatically respond to strong wind, drive the exhaust pipe 3 to rotate, and forcibly change the orientation of the exhaust groove 5, so that the exhaust groove 5 always faces the leeward side, effectively avoids the high-pressure area of the windward surface, significantly reduces the exhaust airflow resistance, improves the ventilation efficiency and operation stability of the negative pressure fan 2, further ensures the efficiency of indoor gas replacement, more accurately avoids the direction of the wind and rain directly impacting the exhaust groove 5, reduces the risk of rain and snow directly pouring through the exhaust groove 5, and further enhances the protection performance of the device in bad weather.

[0039] In the embodiment, as shown in Figure 3 and Figure 4 , the inner wall of the exhaust groove 5 is provided with a plurality of longitudinally arranged V-shaped partitions 501, and the V-shaped partitions 501 are arranged in an inclined state, and there is a gap between adjacent two V-shaped partitions 501;

[0040] A guide plate is welded on each V-shaped partition 501, and the guide plates on adjacent two V-shaped partitions 501 are arranged in a left-right staggered manner;

[0041] In the embodiment, as shown in Figure 7 , the guide plate is divided into an outer guide plate 502 and an inner guide plate 503, the outer guide plate 502 is parallel to the V-shaped partition 501, and the inner guide plate 503 is inclined to the positions of the two lightweight baffles 4;

[0042] It should be noted that by arranging a plurality of V-shaped baffles 501 longitudinally on the inner wall of the exhaust slot 5, and the V-shaped baffles 501 are in a downwardly inclined state, and gaps are left between adjacent baffles, a multi-stage guide can be formed for the exhaust airflow, which can guide the airflow to flow outward smoothly along a preset path, and can also form a physical barrier for vertically falling or obliquely drifting rain and snow. When rain and snow pass through the gaps, they will be intercepted by the guide plates or guided to slide outward. Combined with the protective function of the lightweight baffle 4, the amount of rain and snow that directly enters the exhaust slot 5 is reduced, and the probability of rain and snow intruding into the exhaust pipe 3 and the docking pipe 1 is reduced;

[0043] At the same time, guide plates are installed on several V-shaped baffles 501, and the guide plates of adjacent V-shaped baffles 501 are staggered. For example, the guide plate of the first V-shaped baffle 501 is distributed on the left, and the guide plate of the second V-shaped baffle 501 is distributed on the right. The left and right are staggered, and the light airflow is guided to both sides through the inner guide plates 503 of the guide plates in turn, guiding the oncoming longitudinal airflow to both sides respectively, reducing the impact of the longitudinal airflow on the airflow of the negative pressure fan 2, reducing the turbulent resistance during exhaust, and making the airflow of the negative pressure fan 2 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 guide plate and blocked by the V-shaped partition 501, the strength of the forward airflow will be weakened, reducing the noise generated by the collision with the internal exhaust airflow, and further reducing the overall operating noise.

[0045] In this embodiment, if Figure 6 As shown, 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 end openings of the first channels 401 and the second channels 402 correspond to the inner guide plates 503 on both sides respectively.

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

[0047] In this embodiment, if Figure 7 and Figure 8As shown, the arrows represent the airflow direction, when the wind blows from the front, the longitudinal wind resistance is generated, the longitudinal airflow is divided by the outer guide plate 502 and the inner guide plate 503, and is guided to both sides respectively, the first channel 401 corresponds to the left inner guide plate 503, and connects the airflow guided by the left inner guide plate 503, and the airflow can be directly guided out along the first channel 401;

[0048] Similarly, the second channel 402 corresponds to the right inner guide plate 503, and connects the airflow guided by the right inner guide plate 503, realizes one-to-one guiding cooperation, forcibly changes the direction of the longitudinal airflow, reduces the wind pressure of the longitudinal airflow, and avoids the two sides of the transverse airflow blowing, prevents airflow turbulence, makes the airflow organization of the whole exhaust system more orderly, and can also maintain high efficiency under complex wind conditions, while also reducing additional noise and resistance caused by airflow turbulence;

[0049] In addition, in the embodiment, when the wind blows from the left and right sides transversely, there is no longitudinal airflow, the surface of the light baffle 4 is in effective contact with the transversely blowing airflow, the light baffle 4 is rotated in the direction of the exhaust groove 5 by the transversely blowing airflow, and the side of the exhaust groove 5 is partially shielded, and the transversely blowing airflow can be guided again by the first channel 401 and the second channel 402 to make the exhaust direction of the exhaust groove 5 consistent, and the gas flow rate of the exhaust groove 5 is driven by the transversely blowing airflow, which can improve the shielding effect and assist exhaust.

[0050] In the embodiment, as shown in Figure 1 and Figure 3 The wind vane assembly 7 includes a shaft 701 rotatably connected with the rain shield 6, and a pointing rod 702 fixedly connected with the top end of the shaft 701, the rain shield 6 is arranged above the exhaust pipe 3, and the pointing rod 702 is arranged above the rain shield 6;

[0051] The shaft 701 is penetrated by a plurality of flow guide pipes 703, the flow guide pipes 703 are arranged in a vertical structure with the exhaust pipe 3, one end of the flow guide pipes 703 extends to the position of the exhaust groove 5, and the other end of the flow guide pipes 703 extends to the outside of the exhaust pipe 3;

[0052] The light baffle 4 and the exhaust groove 5 are both arranged on one side of the exhaust pipe 3, the pointing rod 702 senses the wind direction and drives the shaft 701 and the flow guide pipes 703 to rotate, and further drives 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 with the rain shield 6, the rain shield 6 is fixedly connected with the docking pipe 1 through a connecting rod, the position of the rain shield 6 is fixed and unchanged, and the rain shield 6 is always located directly above the exhaust pipe 3 to shield the top of the exhaust pipe 3, so as to avoid rain impact, the pointing rod 702 can flexibly respond to changes in wind direction, and the pointing rod 702 is located directly above the rain shield 6 and will not be shielded by the rain shield 6, so as to accurately capture the dominant wind direction and drive the exhaust pipe 3 to rotate;

[0054] Specifically, when encountering strong wind, a high-pressure area is formed in front, and a low-pressure area is formed at the back, the pointing rod 702 senses the rotation of the strong wind to adjust the direction, the arrow of the pointing rod 702 is opposite to the exhaust groove 5, the pointing rod 702 is driven to rotate by the wind force, the arrow of the pointing rod 702 points to the wind direction, and the shaft 701 is driven to rotate, so that the flow guide pipe 703 is driven to rotate through the shaft 701, and the exhaust pipe 3 is further driven to rotate, so as to ensure that the exhaust groove 5 is always directed to the leeward side, avoid direct contact between the exhaust groove 5 and the strong wind, and avoid reverse wind pressure;

[0055] Meanwhile, by increasing the flow guide pipe 703, the air outlet of the flow guide pipe 703 points to the exhaust groove 5, the external air inlet of the flow guide pipe 703 is provided as a horn mouth, the external wind force is collected through the flow guide pipe 703, the airflow can be directly introduced into the vicinity of the exhaust groove 5 through the flow guide pipe 703, and the airflow direction of the exhaust groove 5 is consistent, so as to increase the airflow speed of the exhaust groove 5 and further assist gas replacement;

[0056] By driving the exhaust groove 5 to rotate synchronously through the exhaust assembly, the exhaust groove 5 is always directed to the leeward side when the wind speed is large, the low-pressure ring on the leeward side is directly used to suck the gas in the exhaust pipe 3, the exhaust airflow is avoided from being directly impacted by the high-pressure wind, not only the reverse wind pressure can be avoided, but also the external wind force can be used to accelerate the internal gas replacement. In the scene of strong wind accompanied by rain and snow, after the wind vane assembly 7 drives the exhaust pipe 3 to turn, the top protection of the rain shield 6 and the lateral shielding of the light baffle 4 are combined.

[0057] In the embodiment, as shown in Figure 1 and Figure 2 , the central axis of the docking pipe 1 coincides with the central axis of the exhaust pipe 3, the docking pipe 1 and the exhaust pipe 3 are in communication with each other, and the sound insulation cotton is bonded to the inner wall of the docking pipe 1;

[0058] It should be noted that the central axes of the docking pipe 1 and the exhaust pipe 3 coincide, which ensures that the airflow is not deflected in the conversion process, reduces local vortex and pressure fluctuation, reduces ventilation resistance, improves the energy efficiency ratio of the negative pressure fan 2, and the sound insulation cotton is directly bonded to the inner wall of the docking pipe 1 and arranged in the operation area of the negative pressure fan 2, so as to effectively absorb mechanical vibration noise and airflow friction noise.

[0059] Working principle: when using the axial flow fan with rainproof and noise reduction function, first, the docking pipe 1 is docked with the exhaust pipe of the roof, and the negative pressure fan 2 is started. After the negative pressure fan 2 is started, indoor gas enters the exhaust pipe 3 through the docking pipe 1, forming an axial airflow port. In the natural state of no wind and no rain outside, the gas is discharged to the outside through the exhaust groove 5 of the curved surface of the exhaust pipe 3, and the light baffle 4 is blown open. At this time, the light baffle 4 is in a natural expanded form, and the indoor and outdoor gas replacement begins.

[0060] Next, the wind speed and direction are sensed through the light baffle 4 and the wind vane assembly 7, and the exhaust groove 5 is adjusted in time. Specifically, it is divided into the following two cases:

[0061] I. The external wind pressure is large, and the wind vane assembly 7 cannot be triggered.

[0062] If the wind direction is left-right horizontal wind, the light baffle 4 is rotated by the horizontal airflow and tilted towards the direction of the exhaust groove 5, further shielding the exhaust groove 5, forming a side baffle, and the horizontal airflow is guided to the front end of the light baffle 4 through the first channel 401 or the second channel 402 on the surface of the light baffle 4.

[0063] If the wind direction is longitudinal wind, and the direction of the exhaust groove 5 is opposite, the airflow will be blown vertically to the V-shaped partition plate 501. The airflow is guided to the first channel 401 and the second channel 402 on both sides through the outer guide plate 502 and the inner guide plate 503 on the surface of the V-shaped partition plate 501, realizing directional guidance. Through the first channel 401 and the second channel 402, a part of the longitudinal airflow is absorbed and forced to change direction, and is directly guided to the exhaust groove 5, increasing the flow rate of the exhaust groove 5, weakening the resistance of the reverse wind, and assisting the exhaust.

[0064] I. The external wind pressure is large, and the wind vane assembly 7 is triggered.

[0065] When the wind pressure is large, the pointing rod 702 of the wind vane assembly 7 is exposed to the external airflow and is rotated by 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 the exhaust pipe 3 is synchronously rotated through the shaft 701, so that the exhaust groove 5 and the light baffle 4 always face the leeward side, avoiding direct confrontation with the strong wind.

[0066] At the same time, the guide pipe 703 collects the external wind through the horn mouth, and imports the position of the exhaust groove 5 and the main exhaust airflow in the same direction, and uses the external wind energy to assist the gas replacement and reduce the energy consumption of the fan.

[0067] Although the present application has been described in detail with reference to the foregoing embodiments, the technical solutions recorded in the foregoing embodiments can be modified, or some of the technical features can be replaced by equivalent features, by those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An axial flow fan with rainproof and noise-reducing functions on a roof, comprising a docking duct (1) and a negative pressure fan (2) mounted on the inner wall of the docking duct (1), characterized in that: The invention also includes an exhaust pipe (3) installed on the top of the docking pipe (1) and capable of rotating and adjusting the exhaust direction, and a plurality of exhaust slots (5) distributed at equal angles are opened on the side curved surface of the exhaust pipe (3), and lightweight baffles (4) capable of sensing airflow are installed on both sides of the exhaust slots (5), and the lightweight baffles (4) can absorb longitudinal airflow and transverse airflow to reduce reverse wind resistance near the exhaust slots (5); The top of the docking 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 weather vane component (7) for driving the exhaust pipe (3) to rotate.

2. The axial flow fan with rainproof and noise-reducing function for a roof according to claim 1, characterized in that: The inner wall of the exhaust groove (5) is provided with a plurality of longitudinally arranged V-shaped partitions (501), and the V-shaped partitions (501) are arranged in an inclined state, with a gap between two adjacent V-shaped partitions (501); A guide plate is welded on each of the V-shaped partitions (501), and the guide plates on two adjacent V-shaped partitions (501) are arranged in a left-right staggered manner.

3. The axial flow fan with rainproof and noise-reducing function for a roof according to claim 2, characterized in that: The guide plate is divided into an outer guide plate (502) and an inner guide plate (503). The outer guide plate (502) is parallel to the V-shaped partition plate (501), and the inner guide plate (503) is inclined toward the positions of the lightweight baffles (4) on both sides.

4. The axial flow fan with rainproof and noise-reducing function for a roof according to claim 3, characterized in that: The lightweight baffle (4) is provided with a plurality of longitudinally arranged first channels (401) and second channels (402), wherein the first channels (401) and the second channels (402) are alternately distributed from top to bottom, and the end openings of the first channels (401) and the second channels (402) respectively correspond to the inner guide plates (503) on both sides.

5. The axial flow fan with rainproof and noise-reducing function for a rooftop according to claim 1, characterized in that: The weather vane assembly (7) comprises a shaft (701) rotatably connected to the rain shield (6), and a pointing 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 pointing rod (702) is located directly above the rain shield (6).

6. The axial flow fan with rainproof and noise-reducing function for a rooftop according to claim 5, characterized in that: A plurality of flow guide tubes (703) are passed through the interior of the shaft (701), and a vertical structure is provided between the flow guide tubes (703) and the exhaust pipe (3), and one end of the flow guide tube (703) extends to the position of the exhaust groove (5), and the other end of the flow guide tube (703) extends to the outside of the exhaust pipe (3).

7. The axial flow fan with rainproof and noise-reducing function for a roof according to claim 6, characterized in that: The lightweight baffle (4) and the exhaust slot (5) are both centrally arranged on one side of the exhaust pipe (3). The pointing rod (702) senses the wind direction and drives the shaft (701) and the guide pipe (703) to rotate, further driving the exhaust pipe (3) to rotate synchronously to adjust the direction of the exhaust slot (5).

8. The axial flow fan with rainproof and noise-reducing function for a rooftop according to claim 1, characterized in that: The central axis of the docking pipe (1) coincides with the central axis of the exhaust pipe (3), and the docking pipe (1) and the exhaust pipe (3) are interconnected, and sound insulation cotton is bonded to the inner wall of the docking pipe (1).

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