Air cooling equipment for reducing noise

Abstract

The invention provides air cooling equipment for reducing noise, and belongs to the technical field of cooling equipment. The air cooling tower comprises an air cooling tower body, a draught fan and an air guide pipe are sequentially installed on the upper side of the air cooling tower body, an air inlet is formed in the side face of the air cooling tower body, a cooling coil is arranged in the air cooling tower body and located between the air inlet and the draught fan, a shutter fan is installed in the air inlet and comprises a plurality of blades arranged in parallel, and first noise elimination structures are arranged in the blades. A second silencing structure is arranged on the outer side wall of the air cooling tower body, and a third silencing structure is arranged in the air guide pipe. The first silencing structure can absorb and weaken noise transmitted outwards from the position of the air inlet, the second silencing structure can weaken noise transmitted outwards from the peripheral side of the air cooling tower body, the third silencing structure can absorb and weaken noise transmitted outwards from the position of the draught fan, and therefore noise generated in the operation process of the air cooling equipment is integrally reduced, and the noise reduction effect of the air cooling equipment is improved. The method has the advantage of improving the working and living quality of people.

Description

Technical Field

[0001] The invention relates to the technical field of cooling equipment, and in particular to an air cooling equipment for reducing noise. Background Art

[0002] Air cooling equipment usually refers to air coolers, which are the most widely used heat exchange equipment for condensation and cooling in petrochemical and oil and gas processing production. Air coolers are generally composed of tube bundles, tube boxes, fans, shutters and frames. Air coolers use ambient air as the cooling medium, sweeping across the finned tubes to cool or condense the high-temperature process fluid in the tubes. They are referred to as "air coolers" or "air-cooled heat exchangers."

[0003] The patent with the announcement number CN118111253A discloses an evaporative air cooling tower with dynamic spray cooling, comprising an air cooling tower body, a fan is installed on the upper side of the air cooling tower body, an air inlet is opened on the side of the air cooling tower body, and an inspection door is installed on the front side of the air cooling tower body; a water storage tank is installed at the bottom of the inner side of the air cooling tower body, a sewage pipe is connected to the left wall of the water storage tank, and a sealing cover is threadedly connected to the end of the sewage pipe. The evaporative air cooling tower with dynamic spray cooling utilizes the rotation of the reciprocating screw to drive the connecting frame to drive the moving ring to move back and forth, thereby controlling the main spray head to move back and forth on the main spray pipe, and swinging the sprayed water. At the same time, when the moving ring moves, the control adjustment rod drives the moving frame to move, cooperates with the transmission of the meshing gear and the gear block, drives the auxiliary spray pipe to rotate, and the auxiliary spray pipe controls the auxiliary spray head to rotate back and forth, and swings the sprayed water to perform dynamic spray cooling.

[0004] However, during use, the flow of the spraying liquid in the cooling process and the operation of the fan in the equipment will generate noise to varying degrees, affecting the work and life of people around. Summary of the invention

[0005] In view of the above problems in the prior art, the present invention provides an air cooling device for reducing noise.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0007] Provided is an air cooling device for reducing noise, comprising an air cooling tower body, a fan is installed on the upper side of the air cooling tower body, an air inlet is opened on the side of the air cooling tower body, a cooling coil is arranged in the air cooling tower body between the air inlet and the fan, a louver fan is installed in the air inlet, the louver fan comprises a plurality of blades arranged in parallel, a first silencer structure is arranged on the blades, a second silencer structure is arranged on the outer side wall of the air cooling tower body, an air duct is connected to the top of the air cooling tower body directly above the fan, and a third silencer structure is arranged in the air duct.

[0008] In some embodiments, the first sound-absorbing structure includes sound-absorbing cotton, a first installation cavity is opened inside the blade, the sound-absorbing cotton is filled in the first installation cavity, and a plurality of sound-absorbing holes connected to the first installation cavity are opened on the blade;

[0009] The second sound-absorbing structure comprises a sound-absorbing layer. The axes of the openings at both ends of the air duct are perpendicular to each other. The sound-absorbing layer is arranged on the inner wall of the air duct.

[0010] In some embodiments, the third muffler structure includes a heat-conducting muffler plate, a second installation cavity is provided on the inner side wall of the air cooling tower body, the heat-conducting muffler plate is provided in the second installation cavity and is parallel to the air cooling tower body where the second installation cavity is located, a plurality of heat dissipation protrusions are provided on both sides of the heat-conducting muffler plate, a vent is provided vertically through the heat dissipation protrusion, the bottom of the second installation cavity is through-opened, and the top is connected to the interior of the air cooling tower body;

[0011] The cooling coil comprises tube sheets detachably arranged on the outer walls of two opposite sides of the air cooling tower body and a plurality of cooling pipes horizontally arranged inside the air cooling tower body, the two ends of the cooling pipes are detachably connected to the tube sheets on both sides respectively, and a plurality of connecting flow channels for connecting at least two cooling pipes are arranged in the tube sheets;

[0012] A plurality of heat-conducting fins are also arranged in the main body of the air cooling tower. The heat-conducting fins are provided with through holes for the cooling pipes to pass through. The heat-conducting fins are arranged perpendicular to the axis of the cooling pipes. The heat-conducting fins are in contact with the outer wall of the cooling pipes. The two ends of the heat-conducting fins extend into the second installation cavities on both sides of the main body of the air cooling tower respectively and are in heat-conducting contact with the heat-conducting muffler plate.

[0013] In some embodiments, an elastic sheet is fixedly provided on the edge of the perforation of the heat conducting fin, and a plurality of elastic sheets are evenly spaced along the circumference of the perforation. One end of the elastic sheet away from the heat conducting fin extends along the length direction of the cooling tube.

[0014] In some embodiments, a rolling belt is provided on the outer side of the elastic sheet, and the rolling belt is used to make the elastic sheet fit the cooling pipe.

[0015] In some embodiments, a wind collecting scoop is provided at the top of the air cooling tower body, above the fan in the air duct. The top opening of the wind collecting scoop is smaller than the bottom opening. A connecting port is provided on the side wall of the air duct, located on one side of the wind collecting scoop. The top of the second installation cavity is connected to the connecting port of the air duct, and the second installation cavity is connected to the interior of the air duct through the connecting port.

[0016] In some embodiments, an installation frame is provided in the air inlet, and the blade rotation is provided in the installation frame. The air inlet can be opened / closed by the rotation of the blade. A driving member for driving multiple blades to rotate synchronously is provided in the installation frame. The driving member includes a driving motor, and the driving motor is provided in the installation frame. A rotating shaft is fixedly provided at both ends of each blade. The blade is rotatably connected to the installation frame through the rotating shaft. Two sprockets are coaxially fixed on the rotating shaft. Two adjacent blades are connected by a chain transmission. The driving motor is used to drive any blade to rotate.

[0017] In some embodiments, a plurality of horizontally arranged water retaining plates are provided on the mounting frame on the side of the blade away from the air cooling tower body. The multiple water retaining plates are arranged in parallel and spaced apart in the vertical direction. The edge of the water retaining plate away from the blade is lower than the edge of the water retaining plate close to the blade.

[0018] In some embodiments, the sound absorbing holes on both sides of the blade are staggered with each other.

[0019] In some embodiments, the mounting frame is detachably connected to the air cooling tower body.

[0020] The beneficial effects of the present invention are as follows: when the air-cooling equipment is in operation, the fan blows air upward to form a negative pressure area below the fan in the air cooling tower body, and air is supplied inward from the air inlet, flows through the cooling coil in the air cooling tower body, and cools down the industrial circulating water or oil or natural gas and other fluids passing through the cooling coil. At the same time, the sound-absorbing cotton in the louver fan blades at the air inlet of the air cooling tower body absorbs and weakens the noise propagating outward from the air inlet position, and the heat-conducting sound-absorbing plate on the outer wall of the air cooling tower body weakens the noise propagating outward from the surrounding side of the air cooling tower body. Finally, the noise propagating outward from the fan passes through the air duct with the outlet air, and when passing through the inner wall of the air duct, it is absorbed and weakened on the sound-absorbing layer, thereby reducing the noise generated during the operation of the air cooling equipment as a whole, and providing a low-noise environment for the work and life of the surrounding people. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of the air cooling device according to an embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of a partial cross-sectional structure of an air cooling device according to an embodiment of the present application;

[0023] Figure 3 for Figure 2 A magnified schematic diagram of part A;

[0024] Figure 4 A schematic diagram of the structure of a blade according to an embodiment of the present application;

[0025] Figure 5 This is a schematic diagram of the structure of the cooling coil and the heat-conducting muffler plate of an embodiment of the present application;

[0026] Figure 6 for Figure 5 A magnified schematic diagram of part B;

[0027] Figure 7 This is a schematic diagram of the connection structure between the blades and the driving member in the installation frame of an embodiment of the present application.

[0028] Among them, 1. air cooling tower body; 11. fan; 12. air inlet; 13. air guide duct; 131. sound absorption layer; 132. wind collecting scoop; 14. second installation cavity; 2. cooling coil; 21. tube plate; 22. cooling pipe; 3. blade; 31. first installation cavity; 32. sound absorption cotton; 33. sound absorption hole; 4. heat conduction silencer plate; 41. heat dissipation protrusion; 42. vent; 43. heat conduction fin; 44. elastic sheet; 45. rolling belt; 5. installation frame; 51. drive motor; 52. sprocket; 53. chain; 54. water retaining plate; 55. connecting bolt. DETAILED DESCRIPTION

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] The embodiment of the present invention provides an air cooling device for reducing noise, referring to Figure 1 , Figure 2 and Figure 3 , including an air cooling tower body 1, the upper end of the air cooling tower body 1 is open, and a fan 11 is installed in the opening, and an air inlet 12 connected to the inside of the air cooling tower body 1 is horizontally opened on the side of the air cooling tower body 1, and a cooling coil 2 is arranged between the air inlet 12 and the fan 11 in the air cooling tower body 1. The cooling coil 2 is used to connect industrial circulating water, so that the circulating water passes through the inside of the air cooling tower body 1, and the flow distance of the circulating water in the air cooling tower body 1 is extended, so that the circulating water obtains a better heat dissipation effect in the air cooling tower body 1.

[0031] Reference Figure 4In the embodiment of the present application, a louver fan is installed in the air inlet 12 of the air cooling tower body 1. The louver fan includes a plurality of blades 3 arranged in parallel. A first muffler structure is provided on the blades 3. A second muffler structure is provided on the outer wall of the air cooling tower body 1. The second muffler structure is located at the top of the air cooling tower body 1 and is connected to an air duct 13 directly above the fan 11. A third muffler structure is provided in the air duct 13. The first muffler structure, the second muffler structure and the third muffler structure are respectively provided from the bottom, the middle and the top of the air cooling tower body 1 to muffle the air inlet and outlet and the outer surface of the air cooling tower body 1, thereby reducing the noise generated during the operation of the air cooling equipment.

[0032] Specifically, the first sound-absorbing structure includes sound-absorbing cotton 32, and each louvered fan blade 3 is provided with a first installation cavity 31 inside, and the sound-absorbing cotton 32 is filled in the first installation cavity 31. The outer wall of the blade 3 is provided with a plurality of sound-absorbing holes 33 connected with the first installation cavity 31. The cross-sectional shape of the blade 3 can be specifically designed to be a shuttle shape with sharp ends and a bulge in the middle. When the air-cooling equipment is in operation, the noise propagates outward from the air inlet 12, passes through the louvered fan, and is reflected on the surface of the blade 3 when passing through the blade 3. The noise entering the sound-absorbing hole 33 of the louvered fan is greatly reduced by the sound-absorbing cotton 32 in the first installation cavity 31, and the louvered fan improves the noise reduction effect of the noise at the air inlet 12. Furthermore, the suction holes on both sides of the blade 3 can be designed to be mutually offset, so as to further enhance the rebound effect of the noise sound waves in the blade 3.

[0033] The second sound-absorbing structure includes a sound-absorbing layer 131. The axes of the openings at both ends of the air duct 13 are perpendicular to each other, and the sound-absorbing layer 131 is arranged on the inner wall of the air duct 13. Since the air duct 13 is designed to be bent, the noise generated by the fan 11 during the outward blowing process needs to continuously pass through the inner wall of the air duct 13 before it can be sent out of the air duct 13. The sound-absorbing layer 131 arranged on the inner wall of the air duct can reduce the noise during the noise reflection process and does not interfere with the normal operation of the fan 11. The sound-absorbing layer 131 can be a sound-absorbing paint applied to the inner wall of the air duct 13, or it can be fixed to the inner wall of the air duct 13 using sound-absorbing foam, etc., to achieve the effect of sound absorption and noise reduction.

[0034] Reference Figure 5 and Figure 6 In the embodiment of the present application, the cooling coil 2 in the air cooling tower body 1 includes a tube sheet 21 and a cooling pipe 22. The tube sheet 21 is provided with two pieces, which are detachably mounted on the two opposite side outer walls of the air cooling tower body 1 by bolts. The cooling pipe 22 is horizontally arranged inside the air cooling tower body 1, and its two ends are respectively connected to the two tube sheets 21. A plurality of cooling pipes 22 are arranged in parallel, and a plurality of connecting flow channels for connecting two cooling tanks are arranged inside the tube sheet 21. The outer wall of the tube sheet 21 is also connected with a water inlet pipe and a water outlet pipe for externally connecting to an industrial circulating water system.

[0035] The third muffler structure includes a heat-conducting muffler plate 4, and a second installation cavity 14 is provided on the side walls of the air cooling tower body 1 on both sides parallel to the length direction of the cooling pipe 22. The heat-conducting muffler plate 4 is fixedly installed in the second installation cavity 14 and is parallel to the air cooling tower body 1 where the second installation cavity 14 is located. A plurality of heat dissipation protrusions 41 are protruding from both sides of the heat-conducting muffler plate 4, and a vent 42 is provided through the heat dissipation protrusion 41 in the vertical direction. The bottom of the second installation cavity 14 is through-opened, and the opening is located on the outside of the air cooling tower body 1, and the top of the second installation cavity 14 is connected to the inside of the air cooling tower body 1. A plurality of heat-conducting fins 43 are also provided in the air cooling tower body 1. The heat-conducting fins 43 are provided with through holes for the cooling pipe 22 to pass through. The heat-conducting fins 43 are arranged perpendicular to the axis of the cooling pipe 22. The heat-conducting fins 43 are in contact with the outer wall of the cooling pipe 22. The two ends of the heat-conducting fins 43 extend into the second installation cavity 14 on both sides of the air cooling tower body 1 respectively and are in heat-conducting contact with the heat-conducting muffler plate 4.

[0036] The heat dissipation protrusions 41 arranged in a staggered manner on the heat-conducting muffler plate 4 increase the surface complexity of the heat-conducting muffler plate 4, which is beneficial to increase the number of rebounds of noise sound waves in the second installation cavity 14 and weaken the noise. At the same time, the heat dissipation protrusions 41 are integrally formed on the heat-conducting muffler plate 4, and the heat-conducting fins 43 and the heat-conducting muffler plate 4 are both made of copper material with good heat conduction effect, so that the heat-conducting fins 43 have a good heat conduction effect, and the heat in the circulating water in the cooling pipe 22 can be transferred to the heat-conducting muffler plate 4 in the second installation cavity 14. The heat dissipation protrusions 41 on the heat-conducting muffler plate 4 increase the contact area with the air, and the hot air floats up into the inside of the air cooling tower body 1 and is discharged, and the cold air is sent upward from the bottom of the second installation cavity 14, so that the second installation cavity 14 forms an auxiliary heat dissipation space, which improves the heat dissipation effect on the circulating water.

[0037] Furthermore, an elastic sheet 44 is fixedly provided on the edge of the perforation on the heat-conducting fin 43, and multiple elastic sheets 44 are evenly spaced along the circumference of the perforation, and one end of the elastic sheet 44 away from the heat-conducting fin 43 extends along the length direction of the cooling tube 22. The elastic sheet 44 increases the contact area between the heat-conducting fin 43 and the outer wall of the cooling tube 22, thereby improving the heat conduction effect. A rolling strip 45 is provided on the outer side of the elastic sheet 44, and the elastic sheet 44 can be attached to the cooling tube 22 by bundling with the rolling strip 45. Furthermore, a thermal conductive coating can be provided on the inner side wall of the elastic sheet 44 to further increase the contact area between the elastic sheet 44 and the cooling tube 22.

[0038] Furthermore, a wind collecting scoop 132 can be provided at the top of the air cooling tower body 1 above the fan 11 in the air duct 13. The top opening of the wind collecting scoop 132 is smaller than the bottom opening. The wind collecting scoop 132 can increase the wind speed at the top opening of the wind collecting scoop 132, and a negative pressure area is formed on both sides of the wind collecting scoop 132. A connecting port is provided on the side wall of the air duct 13 on one side of the wind collecting scoop 132. The top of the second installation cavity 14 is connected to the connecting port of the air duct 13. The second installation cavity 14 is connected to the inside of the air duct 13 through the connecting port. The air in the second installation cavity 14 is drawn upward through the negative pressure areas on both sides of the wind collecting scoop 132, thereby increasing the air flow in the second installation cavity 14 and improving the heat dissipation effect of the heat conduction and sound-absorbing plate 4 in the second installation cavity 14.

[0039] Reference Figure 7 In the embodiment of the present application, a mounting frame 5 is detachably mounted in the air inlet 12 through a connecting bolt 55, and a rotating shaft is fixed at both ends of the blade 3, and the blade 3 is coaxially mounted in the mounting frame 5. With the rotation of the blade 3, the air inlet 12 can be opened / closed. A driving member for driving multiple blades 3 to rotate synchronously is arranged in the mounting frame 5, and the driving member includes a driving motor 51, which is arranged in the mounting frame 5, and a rotating shaft is fixed at both ends of each blade 3. The blade 3 is rotatably connected to the mounting frame 5 through the rotating shaft. Two sprocket wheels 52 are coaxially fixed on the rotating shaft, and two adjacent blades 3 are connected by a chain 53. The driving motor 51 is used to drive any blade 3 to rotate, and multiple blades 3 can be synchronously driven to rotate synchronously through the driving motor 51. According to the temperature of the industrial circulating water, the rotation angle of the blade 3 can be adjusted to change the gap width between the blades 3 for air to pass through the air inlet 12 directly, thereby adjusting the amount of air sent into the air cooling tower body.

[0040] Furthermore, a plurality of horizontally arranged water retaining sheets 54 are provided on the side of the installation frame 5 where the blade 3 is away from the air cooling tower body 1. The plurality of water retaining sheets 54 are arranged in parallel and spaced apart in the vertical direction, and the edge of the water retaining sheet 54 away from the blade 3 is lower than the edge of the water retaining sheet 54 close to the blade 3. The water retaining sheets 54 can prevent external rainwater from entering the sound-absorbing holes 33 on the blade 3, thereby protecting the sound-absorbing cotton 32. At the same time, the inclined water retaining sheets 54 can also increase the obstruction of sound waves in the process of transmitting in and out of the air inlet 12, and the sound-absorbing holes 33 on both sides of the blade 3 can absorb noise sound waves, thereby improving the noise reduction effect. The installation frame 5 is designed to be detachable, so that the staff can remove the installation frame 5 and the louver fan on the installation frame 5 when repairing the air cooling tower body 1, thereby providing convenience for the staff's maintenance.

[0041] It should be understood by those skilled in the art that, although preferred embodiments of the present invention have been described, additional changes and modifications may be made to these embodiments once those skilled in the art are aware of the basic inventive concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An air cooling device for reducing noise, characterized in that: The air cooling tower comprises an air cooling tower body (1), a fan (11) is installed on the upper side of the air cooling tower body (1), an air inlet (12) is opened on the side of the air cooling tower body (1), and a cooling coil (2) is arranged in the air cooling tower body (1) between the air inlet (12) and the fan (11); A louver fan is installed in the air inlet (12), the louver fan comprises a plurality of blades (3) arranged in parallel, a first sound-absorbing structure is arranged on the blades (3), and a second sound-absorbing structure is arranged on the outer side wall of the air cooling tower body (1); The top of the air cooling tower body (1) is located directly above the fan (11) and is connected to an air guide duct (13), and a third noise reduction structure is arranged in the air guide duct (13).

2. An air cooling device for reducing noise according to claim 1, characterized in that: The first sound-absorbing structure comprises sound-absorbing cotton (32), a first installation cavity (31) is provided inside the blade (3), the sound-absorbing cotton (32) is filled in the first installation cavity (31), and a plurality of sound-absorbing holes (33) communicating with the first installation cavity (31) are provided on the blade (3); The second sound-absorbing structure comprises a sound-absorbing layer (131); the axes of the openings at both ends of the air duct (13) are perpendicular to each other; and the sound-absorbing layer (131) is arranged on the inner wall of the air duct (13).

3. An air cooling device for reducing noise according to claim 2, characterized in that: The third muffler structure comprises a heat-conducting muffler plate (4), a second installation cavity (14) is arranged on the inner side wall of the air cooling tower body (1), the heat-conducting muffler plate (4) is arranged in the second installation cavity (14) and is parallel to the air cooling tower body (1) where the second installation cavity (14) is located, a plurality of heat dissipation protrusions (41) are protruding from both sides of the heat-conducting muffler plate (4), a vent (42) is provided through the heat dissipation protrusion (41) in a vertical direction, the bottom of the second installation cavity (14) is through-opened, and the top is connected to the interior of the air cooling tower body (1); The cooling coil (2) comprises a tube sheet (21) detachably arranged on two opposite side outer walls of an air cooling tower body (1) and a plurality of cooling pipes (22) horizontally arranged inside the air cooling tower body (1), the two ends of the cooling pipe (22) being detachably connected to the tube sheets (21) on both sides, and the tube sheet (21) is provided with a plurality of connecting flow channels for connecting at least two cooling pipes (22); A plurality of heat-conducting fins (43) are also arranged in the air cooling tower body (1), and the heat-conducting fins (43) are provided with through holes for the cooling pipe (22) to pass through. The heat-conducting fins (43) are arranged perpendicular to the axis of the cooling pipe (22), and the heat-conducting fins (43) are in contact with the outer wall of the cooling pipe (22). The two ends of the heat-conducting fins (43) respectively extend into the second installation cavity (14) on both sides of the air cooling tower body (1) and are in heat-conducting contact with the heat-conducting muffler plate (4).

4. An air cooling device for reducing noise according to claim 3, characterized in that: An elastic sheet (44) is fixedly arranged on the edge of the perforation on the heat-conducting fin (43), and a plurality of elastic sheets (44) are evenly spaced along the circumference of the perforation. One end of the elastic sheet (44) away from the heat-conducting fin (43) extends along the length direction of the cooling tube (22).

5. An air cooling device for reducing noise according to claim 4, characterized in that: A rolling belt (45) is provided on the outer side of the elastic sheet (44), and the elastic sheet (44) is made to fit the cooling pipe (22) by the rolling belt (45).

6. An air cooling device for reducing noise according to claim 3, characterized in that: A wind collecting scoop (132) is provided at the top of the air cooling tower body (1) above the fan (11) in the air duct (13); the top opening of the wind collecting scoop (132) is smaller than the bottom opening; a connecting port is provided on the side wall of the air duct (13) on one side of the wind collecting scoop (132); the top of the second installation cavity (14) is connected to the connecting port of the air duct (13); and the second installation cavity (14) is connected to the interior of the air duct (13) through the connecting port.

7. An air cooling device for reducing noise according to claim 2, characterized in that: The air inlet (12) is provided with a mounting frame (5), the blades (3) are rotatably arranged in the mounting frame (5), and the air inlet (12) can be opened / closed by the rotation of the blades (3). The mounting frame (5) is provided with a driving member for driving the plurality of blades (3) to rotate synchronously, and the driving member comprises a driving motor (51), the driving motor (51) is arranged in the mounting frame (5), and a rotating shaft is fixedly arranged at both ends of each blade (3), and the blade (3) is rotatably connected to the mounting frame (5) via the rotating shaft, and two sprocket wheels (52) are coaxially fixedly arranged on the rotating shaft, and two adjacent blades (3) are connected in transmission via a chain (53), and the driving motor (51) is used to drive any blade (3) to rotate.

8. An air cooling device for reducing noise according to claim 7, characterized in that: A plurality of horizontally arranged water retaining sheets (54) are provided on the installation frame (5) at a side of the blade (3) away from the air cooling tower body (1); the plurality of water retaining sheets (54) are arranged in parallel and spaced apart in a vertical direction; the edge of the water retaining sheet (54) away from the blade (3) is lower than the edge of the water retaining sheet (54) close to the blade (3).

9. An air cooling device for reducing noise according to claim 8, characterized in that: The sound absorbing holes (33) on both sides of the blade (3) are staggered with each other.

10. An air cooling device for reducing noise according to claim 7, characterized in that: The installation frame (5) is detachably connected to the air cooling tower body (1).

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