A bidirectional exhaust fan

Abstract

This utility model discloses a bidirectional exhaust fan, including a fan blade assembly, a cooling device, and an adsorption device. The cooling device includes a cooling frame and a water curtain plate assembly comprising multiple water curtain plates, which are arranged sequentially from top to bottom at intervals on the mating side of the cooling frame. The cooling frame is mounted on the fan blade frame. The adsorption device is installed between the water curtain plate assembly and the fan blade assembly. The adsorption device includes several nozzles, a first pipe installed on the cooling frame, a water tank connected to the first pipe, and a water pump installed in the water tank. The nozzles are sequentially and at intervals on the first pipe. The water tank is installed outside the cooling frame, and the outlet of the water pump is connected to the first pipe. When the water pump is working, each nozzle sprays water to form a water wall, and when the exhaust fan body blows air, it disperses the water wall and sends it into the adjacent water walls. In this way, indoor air can be exhausted to the outside, and outdoor air can be filtered, cooled, and sent into the room to cool the indoor air.

Description

Technical Field

[0001] This utility model relates to exhaust fans, and more specifically to a bidirectional exhaust fan. Background Technology

[0002] An exhaust fan is an air conditioning appliance that uses a motor to drive the fan blades to rotate and drive airflow, so as to exchange indoor and outdoor air. It is also known as a ventilation fan. The purpose of exhaust is to remove indoor polluted air and regulate temperature and humidity. It is now widely used in homes and public places.

[0003] Currently, to ensure indoor environmental comfort, especially in enclosed spaces such as basements, garages, factories, and commercial kitchens, indoor fans are often required. This results in space occupation and airflow interference, leading to poor performance. To address this, a bidirectional exhaust fan has been designed on the market. When the motor rotates forward, the fan exhausts indoor air to the outside, and when the motor rotates backward, it brings outdoor air into the room, thus achieving air circulation. However, with this bidirectional exhaust fan, the airflow is poor in hot summers, failing to cool the room to a suitable temperature. Furthermore, in dusty environments, it cannot prevent dust from being directly exhausted outdoors or brought indoors.

[0004] In view of this, this application has conducted in-depth research on this basis, resulting in this case. Utility Model Content

[0005] The purpose of this invention is to provide a two-way exhaust fan that has a good cooling effect and can purify the air.

[0006] To achieve the above objectives, the solution of this utility model is as follows: A bidirectional exhaust fan, comprising an exhaust fan body, the exhaust fan body including a fan blade assembly, a cooling device, and an adsorption device; the fan blade assembly including a fan blade frame, a fan blade assembly, and a fan blade drive motor mounted on the fan blade frame for driving the fan blade assembly to rotate forward or backward; the cooling device including a cooling frame and a water curtain plate assembly, the cooling frame having one side as a mating side and the other side as a disengaging side; the water curtain plate assembly including a plurality of water curtain plates, each of which is arranged sequentially from top to bottom at intervals on the mating side of the cooling frame; the cooling frame being detachably mounted on the fan blade frame; the adsorption device including a water spraying assembly and a water pumping assembly mounted between the water curtain plate assembly and the fan blade assembly. The water spray assembly includes several downward-facing nozzles and a first pipe installed on the top of the mating side of the cooling frame. The water pumping assembly includes a water tank connected to the first pipe and a water pump installed in the water tank. The first pipe and each water curtain plate are arranged side by side, and several nozzles are installed at intervals along the length of the first pipe. The water tank is installed on the outside of the cooling frame away from the cooling frame. The outlet of the water pump is connected to the first pipe through the outlet of the water tank. A water collection trough is provided at the bottom of the mating side of the cooling frame. When the water pump is in operation, it causes each nozzle to spray water to form a water wall, and the water wall is close to each water curtain plate.

[0007] Both the fan blade frame and the cooling frame are square frames. The side where the fan blade frame and the cooling frame are installed together is the installation side. The fan blade frame has several mounting holes 1 around its perimeter. The cooling frame has mounting holes 2 corresponding to each of the mounting holes 1. Each of the corresponding mounting holes 1 and mounting holes 2 is fitted with a locking fastener.

[0008] The inner and outer rings of the cooling frame are both square structures, and a hollow cavity is formed between the inner and outer rings. A second pipe is provided in the hollow cavity near the water tank. The outlet of the water tank is connected to the lower end of the second pipe, and the upper end of the second pipe is connected to the first pipe. An outlet is provided on the lower side of the hollow cavity. A slot is provided at the bottom of the water collection tank. A third pipe is installed on the slot. One end of the third pipe is connected to the water tank or the collection tank through the outlet.

[0009] The water collection tank is provided with an inlet, and a filter element is provided inside the water collection tank at the position corresponding to the inlet, and the outlet of the water collection tank is connected to the inlet of the water tank; or, the water tank is provided with an inlet, and a filter element is provided inside the water tank at the position corresponding to the inlet.

[0010] Each of the water curtain panels is detachably installed on the mating side wall of the cooling frame.

[0011] The cooling frame has several assembly holes on its two opposite sidewalls. Each assembly hole corresponds to another and is arranged at intervals on the same sidewall. Each water curtain plate has an assembly protrusion extending from both ends. Each assembly protrusion is fixedly installed or rotatedly installed with the corresponding assembly hole.

[0012] Each of the mounting protrusions is inserted into the corresponding mounting hole, and each mounting hole is fitted with a rubber plug. The rubber plug includes an integrally connected rubber ring and several serrated rubber movable parts. One end of each rubber movable part is arranged close to the circumference of the rubber ring, and the tip of each rubber movable part extends along the axis of the rubber ring. The axis of the rubber plug, through the tips of each rubber movable part, forms a hollow part for the mounting protrusion to be inserted.

[0013] Each of the water curtain plates is rotatably mounted on the cooling frame in a manner that allows adjustment of the angle between them and the vertical plane. Each of the assembly holes is a blind hole, and each of the assembly holes has an arc-shaped limiting groove arranged circumferentially inside. Each of the assembly protrusions is provided with a sliding block corresponding to the arc-shaped limiting groove.

[0014] The adjustable range of the angle between each of the water curtain panels and the vertical plane is 0°-45°.

[0015] The fan blade assembly includes a rotating base and a plurality of fan blades, each fan blade being arranged sequentially at circumferential intervals along the rotating base, and a frame is mounted on the fan blade frame, the fan blade drive motor is mounted on the frame, and the output shaft of the fan blade drive motor is connected to the rotating base.

[0016] With the above structure, this utility model has the following beneficial effects: 1. By using a fan blade device, a cooling device, and an adsorption device, when the exhaust fan body is in the exhaust state, the exhaust fan body exhausts indoor air to the outside; when the exhaust fan body is in the air supply state, the water pump in the adsorption device works, transporting water from the water tank to the first pipe. Each nozzle on the first pipe continuously sprays water downwards, forming a water wall. At the same time, the exhaust fan body works, so that the exhaust fan body supplies air into the room. The airflow impacts the water wall, breaking the water wall into fine water droplets. The water droplets adsorb dust or dirt in the airflow, and then the water droplets carry the dust or dirt into the water curtain plate and the water collection tank. The water droplets wet each water curtain plate to achieve heat absorption and cooling. At the same time, the purified airflow is sent into the room. Compared with the prior art, this utility model can exhaust indoor air to the outside, and at the same time filter outdoor air and send it into the room, and reduce the temperature of the airflow sent into the room, thereby reducing the indoor temperature.

[0017] 2. This utility model adopts a water collection tank, combined with a filter in the water tank or collection tank, to filter the dust or dirt adsorbed by the water wall and then return it to the water tank, thereby realizing water circulation. There is no need to frequently monitor the water level in the water tank, and water resources are saved at the same time.

[0018] 3. In this utility model, each water curtain plate is detachable and easy to disassemble and assemble. After prolonged use, it is also convenient for operators to disassemble and clean it. At the same time, operators can also disassemble the cooling frame and clean each water curtain plate together. Disassembly is convenient and simple.

[0019] 4. The rotating arrangement of each water curtain plate in this utility model is such that the water curtain plate forms an angle with the vertical plane, which ensures that the air sent into the room cools down while also ensuring that more air is blown into the room. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the bidirectional exhaust fan of this utility model.

[0021] Figure 2 This is a schematic diagram of the assembly of the fan blade frame and the cooling frame in this utility model.

[0022] Figure 3 This is a schematic diagram of the structure of the fan blade device and the blocking net in this utility model.

[0023] Figure 4 This is a schematic diagram of the assembly of the cooling device and the adsorption device in the bidirectional exhaust fan of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the rubber stopper in this utility model.

[0025] In the picture:

[0026] 100 - Exhaust fan body;

[0027] 1-Fan blade assembly; 11-Fan blade frame; 12-Fan blade drive motor; 13-Rotating seat; 14-Fan blade; 15-Frame; 16-Blocking net;

[0028] 2-Cooling device; 21-Cooling frame; 211-Assembly hole; 22-Water curtain plate; 221-Assembly protrusion; 23-Rubber plug; 231-Rubber ring; 232-Rubber movable part;

[0029] 3-Adsorption device; 31-First pipe; 32-Water tank; 33-Water pump; 34-Sprayer head; 35-Second pipe; 36-Third pipe. Detailed Implementation

[0030] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0031] This utility model provides a two-way exhaust fan, which is an improvement on the two-way exhaust fans already sold on the market. The two-way exhaust fan is arranged vertically. This utility model can be applied to a variety of scenarios, such as in the kitchen, where the exhaust mode is activated when exhausting oil fumes and the ventilation mode is adjusted to the air supply mode (introducing outdoor air to balance the air pressure) after cooking is finished. Another example is in industrial plants for heat dissipation, where the exhaust mode is activated during the day in summer to expel hot air and the air supply mode is activated at night to draw in cool air.

[0032] like Figure 1-5 As shown, the present invention includes an exhaust fan body 100, which includes a fan blade device 1, a cooling device 2, and an adsorption device 3.

[0033] The aforementioned fan blade device 1 includes a fan blade frame 11, a fan blade assembly, and a fan blade drive motor 12. The housing of the fan blade drive motor 12 is mounted within the fan blade frame 11. The fan blade drive motor 12 drives the fan blade assembly to perform a circular motion in a clockwise (forward) or counterclockwise (reverse) direction. In this embodiment, the aforementioned fan blade device 1 can adopt the fan blade device from a commercially available bidirectional exhaust fan. For example, the fan blade device includes a rotating base 13 and several fan blades 14, with each fan blade 14 arranged sequentially at circumferential intervals along the rotating base 13. That is, one end of each fan blade 14 is integrally connected to or connected to the rotating base 13, and the connection between the two adopts a connection structure commonly used in conventional fans or blowers. The other end of each fan blade 14 is adjacent to the side wall of the fan blade frame 11. A frame 15 is installed in the middle of the fan blade frame 11, and the housing of the fan blade drive motor 12... The body is fixedly installed in the middle of the frame 15, and the output shaft of the fan blade drive motor 12 is tightly inserted into the rotating base 13. The fan blade drive motor 12 is a commercially available forward and reverse motor. When the fan blade drive motor 12 rotates forward, it drives each fan blade 14 to rotate clockwise around the axis of the rotating base 13 to exhaust indoor air to the outside, thus achieving exhaust. When the fan blade drive motor 12 rotates in reverse, it drives each fan blade 14 to rotate counterclockwise around the axis of the rotating base 13 to bring outdoor air into the room, thus achieving ventilation.

[0034] Preferably, a barrier net 16 is detachably installed on the front side of the fan blade frame 11. The barrier net 16 can be installed on the front side of the fan blade frame 11 in a conventional manner (using screws or bolts and other fasteners that cooperate with the mounting holes) to prevent small and medium-sized animals or objects such as birds from entering. The size of the mesh of the barrier net 16 is set according to the actual situation and is not limited here.

[0035] It should be noted that the structure of the aforementioned fan blade 14 is a conventional fan blade structure, such as the one with announcement number CN202673777U - a bidirectional exhaust fan blade.

[0036] For ease of description, the orientation of this utility model when it is normally installed on the wall is taken as the reference direction of this utility model.

[0037] like Figure 1 As shown and as Figure 4-5 As shown, the cooling device includes a cooling frame 21 and a water curtain plate assembly. The cooling frame 21 is detachably installed on the rear side of the fan blade frame 11, which refers to the side opposite to the front side. Preferably, both the cooling frame 21 and the fan blade frame 11 are square frames. When the cooling frame 21 and the fan blade frame 11 are assembled together, the side wall of the mating side of the cooling frame 21 and the side wall of the mating side of the fan blade frame 11 are connected to each other, and a ventilation channel is formed between the mating sides of the two.

[0038] Furthermore, in this embodiment, the mounting structure between the cooling frame 21 and the fan blade frame 11 can adopt a conventional mounting structure. For example, the fan blade frame 11 and the fan blade frame 21 are respectively provided with a number of corresponding mounting holes, and each pair of corresponding mounting holes is equipped with a locking fastener, which can be a screw, bolt or rivet. Preferably, the width of the fan blade frame 11 is smaller than the width of the cooling frame 21, and the length of the fan blade frame 11 is smaller than the length of the cooling frame 21. In this embodiment, the length direction is the up and down direction. Mounting lugs are integrally connected to the four sides of the fan blade frame 11 on the opposite side. Preferably, each side wall of the fan blade frame 11 is provided with a mounting lug, and there are four mounting lugs in total. Each mounting lug is provided with a mounting hole one. The rear side of the cooling frame 21 is provided with a mounting hole two corresponding to each mounting hole one. Each pair of corresponding mounting holes one and mounting holes two are fitted with a locking fastener, which is the same as the aforementioned locking fastener, so as to install the cooling frame 21 on the rear side of the fan blade frame 11.

[0039] For ease of description, the side around which the cooling frame 21 surrounds is the mating side, and the side opposite is the opposing side. The width direction of the cooling frame 21 is the left-right direction, and the length direction of the cooling frame 21 is the up-down direction.

[0040] The aforementioned water curtain panel assembly includes several water curtain panels 22, each of which is square in shape. The water curtain panels 22 are arranged sequentially from top to bottom on the mating side of the cooling frame 21, and the length direction of each water curtain panel 22 is arranged along the left-right direction. Preferably, the water curtain panels 22 are arranged sequentially at intervals. In this embodiment, the aforementioned water curtain panel 22 is a water curtain panel with the water curtain portion located within the frame. This type of water curtain panel 22 is a conventional water curtain panel that is already available on the market, and water curtain panels on the market can be customized according to actual dimensions.

[0041] Furthermore, since the structures of the aforementioned water curtain panels are identical, one of them will be used as an example for explanation. The water curtain panel 22 is detachably installed on the left and right side walls of the mating side of the cooling frame 21. Specifically, the left and right side walls of the mating side of the cooling frame 21 are provided with a number of mounting holes 211. The mounting holes 211 on the left side wall of the mating side of the cooling frame 21 are arranged evenly from top to bottom, and the mounting holes 211 on the right side wall of the mating side of the cooling frame 21 are arranged evenly from top to bottom. Each mounting hole 211 corresponds to the other. The left and right ends of the water curtain panel 22 are respectively provided with mounting protrusions 221. The water curtain panel 22 is installed in any pair of corresponding mounting holes 211 of the cooling frame 21 through the two mounting protrusions 221 on it. Preferably, each mounting protrusion 221 is inserted into the mounting hole 211, and each mounting protrusion 221 is fitted with a rubber plug 23. The rubber plug 23 is a conventional rubber plug, for example, Figure 5As shown, the rubber plug 23 includes an integrally connected rubber ring 231 and several serrated rubber movable parts 232. The rubber ring 231 matches the mounting hole 211. Each rubber movable part 232 is integrally connected to the inner ring of the rubber ring 231, and each rubber movable part 232 is arranged close together clockwise along the rubber ring 231. The tip of each rubber movable part 232 extends along the axis of the rubber ring 231 and forms a hollow part. The mounting protrusion 221 matches the rubber ring 231. In this way, the mounting protrusion 221 passes through the center of the rubber ring 231 and is engaged with each rubber movable part 232. Due to the arrangement of each rubber movable part 232, the mounting protrusion 221 can be tightly disposed in the mounting hole 211, and when the mounting hole 211 is idle, it can prevent water from entering the hollow cavity to a certain extent.

[0042] As a preferred embodiment, the water curtain plate 22 is rotatably mounted on the cooling frame 21 in a manner that allows adjustment of the angle between it and the vertical plane. That is, each mounting hole 211 is a blind hole, and the non-rubber plug portion inside each mounting hole 211 is provided with an arc-shaped limiting groove arranged circumferentially. Each mounting protrusion 221 is provided with a sliding block corresponding to the arc-shaped limiting groove. In this way, the water curtain plate 22 is slidably limited in the arc-shaped limiting groove by the sliding blocks on the mounting protrusions 221 at both ends, so as to limit the rotation angle of the water curtain plate 22. In this embodiment, the limiting angle is 0°-45°, that is, the adjustable angle range between the water curtain plate and the vertical plane is 0°-45°. The installation process of the water curtain plate 22 is as follows: During installation, the operator first adjusts the angle of the water curtain plate, then inserts it into the corresponding rubber plugs in sequence, and then inserts the two sliding blocks on the water curtain plate into the corresponding arc-shaped limiting grooves. Subsequently, the water curtain plate is finely adjusted by applying greater external force to adjust it to the required angle. During disassembly, the operator uses external force to detach the sliding blocks from the arc-shaped limiting grooves and then pulls them out from the rubber plugs, thereby disassembling the water curtain plate. In this way, the water curtain plate is easy to disassemble, which facilitates the installation and removal of the water curtain plate of the cooling frame 21 according to actual needs, and also facilitates the cleaning of individual water curtain plates.

[0043] Furthermore, the inner ring of the cooling frame 21 is a closed square ring, and the outer ring of the cooling frame 21 is a closed square ring. The fan blade assembly is located in the inner ring of the cooling frame 21. A hollow cavity is provided between the inner and outer rings of the cooling frame 21, and the hollow cavity is used to accommodate the pipe described below.

[0044] The aforementioned adsorption device 3 is installed on the cooling frame 21 and located between the water curtain plate assembly and the fan blade assembly. The adsorption device 3 includes a water spraying assembly and a water pumping assembly. The water spraying assembly includes a first pipe 31 and several nozzles 34. The water pumping assembly includes a water tank 32 and a water pump 33. The first pipe 31 is fixedly installed on the top of the mating side of the cooling frame 21, and several pipe holes are respectively opened along the length direction of the first pipe 31, and each pipe hole is arranged downward. Preferably, each pipe hole is equipped with a nozzle in a conventional manner, and each nozzle is arranged close to each water curtain plate, and each nozzle sprays water downward. In this embodiment, each nozzle is a commercially available spray head, shower head, or water spray head, etc., and the first pipe 31 can be installed on the cooling frame 21 in a conventional manner such as using a semi-circular bracket. The water tank 32 is installed on the left or right side of the cooling frame 21 away from the cooling frame and is located on the cooling side. In this embodiment, the water tank 32 can be directly and conventionally fixedly installed on the outside of the cooling frame 21, away from the cooling frame 21, or it can be installed on a wall, the ground, or other locations, and then connected to the water tank 32 through a pipe. The water tank 32 has a water outlet, referred to as the water tank outlet. The water pump 33 is installed in the water tank 32 and is located near the water tank outlet. The water outlet of the water pump 33 is connected to the first pipe 31 through the water tank outlet, so that the water in the water tank can be pumped into the first pipe 31 by the water pump 33, and then sprayed out through each nozzle 34 of the first pipe 31. Since each nozzle 34 is arranged downward, the water sprayed by each nozzle 34 can form a vertical water wall. In this way, when the water pump is in operation, each nozzle sprays water to form a water wall, and when the exhaust fan body 100 is in the air supply state, the water wall is broken up and sent into the adjacent water curtain plate.

[0045] It should be noted that the formation of a water wall by the water sprayed from each nozzle 34 is a conventional operation. The spacing between each nozzle 34 is adjusted by the spray area of ​​each nozzle 34. Preferably, the spacing between each nozzle 34 is 80-120mm, so that adjacent nozzles 34 overlap to form a water wall when spraying, and ensure the continuity of the water wall. Preferably, each nozzle 34 is arranged at an angle of 15-30° from top to bottom to reduce impact in the direction of airflow. In this embodiment, the nozzles can be commercially available fan-shaped nozzles (spray angle 60-90°) or spiral nozzles.

[0046] Furthermore, a second pipe 35 is installed in the hollow cavity on the side adjacent to the water tank. The upper end of the second pipe 35 is connected to the first pipe 31, and the lower end of the second pipe 35 extends out of the hollow cavity and is connected to the water outlet of the water tank, thereby enabling the water pump to pump water from the water tank into the first pipe.

[0047] Furthermore, a water collection trough is provided at the bottom of the mating side of the cooling frame 21. In this embodiment, the water collection trough can be connected to a water tank or communicate with a collection water tank. Specifically, when the water collection trough is communicated with the water tank, an outlet is provided at the bottom of the lower side of the hollow cavity. A slot is provided at the bottom of the water collection trough near the water tank, and the bottom of the water collection trough is arranged sloping downwards from the direction closest to the water tank. A third pipe 36 is conventionally installed on the slot, and one end of the third pipe 36 is connected to the inlet of the water tank through the outlet. The water tank is equipped with... The system has an inlet, and a filter element is installed in the water tank corresponding to the inlet. This filter element can be a commercially available water purification filter, such as one made of activated carbon. The particle size filtered by the filter element is set according to actual needs; for example, it can be set to filter particles or dust larger than PM10. Water sprayed from the nozzles and water flowing down from the water curtain plates is collected by the water collection tank and returned to the water tank after filtration. In this embodiment, the water tank has a sealed cover, allowing water to be added by opening the cover. When the water collection tank is connected to the collection tank, one end of the third pipe is connected to the collection tank through an outlet. The collection tank has an inlet, and the aforementioned filter element is installed in the collection tank corresponding to the inlet. Preferably, the outlet of the collection tank and the inlet of the water tank are interconnected, so that the water collected in the collection tank is filtered and flows back into the water tank for recycling. Preferably, the collection tank or the interior of the tank is also equipped with another water pump to pump the water in the collection tank back to the corresponding tank.

[0048] It should be noted that the present invention can use conventional methods such as remote control or manual switch to switch between exhaust and air supply. These switching methods are existing conventional technologies, so they will not be described in detail.

[0049] This utility model discloses a bidirectional exhaust fan. When the exhaust fan body 100 is in the exhaust state, each fan blade rotates forward to expel indoor air to the outside. When the exhaust fan body 100 is in the air supply state, each fan blade rotates backward to bring outdoor air into the room. During this process, the water pump operates, and each nozzle begins to spray water to form a water wall in the cooling frame. Due to the air supply and the close proximity of the water curtain plate and the water wall, the airflow impacts the water wall, breaking it into fine water droplets. The water droplets collide with particles or dust in the air and are captured through inertial and diffusion effects. The water droplets carrying dust fall back onto the corresponding water curtain plate or into the water collection tank under the action of gravity. The water droplets falling onto the water curtain plate moisten the water curtain plate, thereby achieving the functions of cooling and purifying the air entering the room.

[0050] Furthermore, during cleaning and replacement, the entire cooling frame 21 can be disassembled, separating the second and third pipes; each water curtain panel can also be disassembled. In this embodiment, each water curtain needs to be cleaned and replaced regularly to maintain its functionality. Additionally, the moisture-laden air can bring humidity to the room (especially in dry places like factories during summer), compensating for the humidity carried out during exhaust.

[0051] It should be noted that when the exhaust fan body 100 is in the air supply state, the water wall formed by the spraying of water from each nozzle 34 in this embodiment can still maintain the water curtain under the action of the airflow of the fan blades. To ensure the continuous stability of the water curtain, existing conventional optimization design can be used. For example, if the wind speed of the exhaust fan body 100 is 2.5ms-4ms, the water spray volume is about 0.4-0.6L / m³ air. Preferably, the water pump is a variable frequency water pump, and the water volume is dynamically adjusted by the water pump to adapt to the wind speed change.

[0052] This is a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of this utility model shall fall within the scope of the claims of this utility model.

Claims

1. A bidirectional exhaust fan, characterized in that: The device includes an exhaust fan body, which comprises a fan blade assembly, a cooling device, and an adsorption device. The fan blade assembly includes a fan blade frame, a fan blade assembly, and a fan blade drive motor mounted on the fan blade frame for driving the fan blade assembly to rotate forward or backward. The cooling device includes a cooling frame and a water curtain plate assembly. One side of the cooling frame is a mating side, and the other side is a non-matting side. The water curtain plate assembly includes several water curtain plates, which are arranged sequentially from top to bottom at intervals on the mating side of the cooling frame. The cooling frame is detachably mounted on the fan blade frame. The adsorption device includes a water spray assembly and a water pumping assembly installed between the water curtain plate assembly and the fan blade assembly. The water assembly includes several downward-facing nozzles and a first pipe installed on the top of the mating side of the cooling frame. The water pumping assembly includes a water tank communicating with the first pipe and a water pump installed in the water tank. The first pipe and each water curtain plate are arranged side by side, and several nozzles are installed at intervals along the length of the first pipe. The water tank is installed on the outside of the cooling frame away from the cooling frame. The outlet of the water pump is connected to the first pipe through the outlet of the water tank. A water collection trough is provided at the bottom of the mating side of the cooling frame. When the water pump is in operation, it causes each nozzle to spray water to form a water wall, and the water wall is close to each water curtain plate.

2. The bidirectional exhaust fan according to claim 1, characterized in that: Both the fan blade frame and the cooling frame are square frames. The side where the fan blade frame and the cooling frame are installed together is the installation side. The fan blade frame has several mounting holes 1 around its perimeter. The cooling frame has mounting holes 2 corresponding to each of the mounting holes 1. Each of the corresponding mounting holes 1 and mounting holes 2 is fitted with a locking fastener.

3. A bidirectional exhaust fan according to claim 2, characterized in that: The inner and outer rings of the cooling frame are both square structures, and a hollow cavity is formed between the inner and outer rings. A second pipe is provided in the hollow cavity near the water tank. The outlet of the water tank is connected to the lower end of the second pipe, and the upper end of the second pipe is connected to the first pipe. An outlet is provided on the lower side of the hollow cavity. A slot is provided at the bottom of the water collection tank. A third pipe is installed on the slot. One end of the third pipe is connected to the water tank or the collection tank through the outlet.

4. A bidirectional exhaust fan according to claim 3, characterized in that: The water collection tank is provided with an inlet, and a filter element is provided inside the water collection tank at the position corresponding to the inlet, and the outlet of the water collection tank is connected to the inlet of the water tank; or, the water tank is provided with an inlet, and a filter element is provided inside the water tank at the position corresponding to the inlet.

5. A bidirectional exhaust fan according to any one of claims 1-4, characterized in that: Each of the water curtain panels is detachably installed on the mating side wall of the cooling frame.

6. A bidirectional exhaust fan according to claim 5, characterized in that: The cooling frame has several assembly holes on its two opposite sidewalls. Each assembly hole corresponds to another and is arranged at intervals on the same sidewall. Each water curtain plate has an assembly protrusion extending from both ends. Each assembly protrusion is fixedly installed or rotatedly installed with the corresponding assembly hole.

7. A bidirectional exhaust fan according to claim 6, characterized in that: Each of the mounting protrusions is inserted into the corresponding mounting hole, and each mounting hole is fitted with a rubber plug. The rubber plug includes an integrally connected rubber ring and several serrated rubber movable parts. One end of each rubber movable part is arranged close to the circumference of the rubber ring, and the tip of each rubber movable part extends along the axis of the rubber ring. The axis of the rubber plug, through the tips of each rubber movable part, forms a hollow part for the mounting protrusion to be inserted.

8. A bidirectional exhaust fan according to claim 6, characterized in that: Each of the water curtain plates is rotatably mounted on the cooling frame in a manner that allows adjustment of the angle between them and the vertical plane. Each of the assembly holes is a blind hole, and each of the assembly holes has an arc-shaped limiting groove arranged circumferentially inside. Each of the assembly protrusions is provided with a sliding block corresponding to the arc-shaped limiting groove.

9. A bidirectional exhaust fan according to claim 8, characterized in that: The adjustable range of the angle between each of the water curtain panels and the vertical plane is 0°-45°.

10. A bidirectional exhaust fan according to claim 6, characterized in that: The fan blade assembly includes a rotating base and a plurality of fan blades, each fan blade being arranged sequentially at circumferential intervals along the rotating base, and a frame is mounted on the fan blade frame, the fan blade drive motor is mounted on the frame, and the output shaft of the fan blade drive motor is connected to the rotating base.

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