A noise reduction device for a cooling tower

Abstract

This application relates to the field of noise control devices, and provides a noise reduction device for a cooling tower, which includes a silencing cover and at least two noise reduction fans; the silencing cover is used to be installed at the heat dissipation opening position at the bottom of the cooling tower and cover the heat dissipation opening to form a silencing cavity; at least two of the noise reduction fans are all installed on the silencing cover; when the noise reduction fans are started, the airflows generated by at least two of the noise reduction fans converge at the heat dissipation opening position at the bottom of the silencing cavity and enter the heat dissipation opening. Based on this, the refraction of sound waves can be caused by the airflow, so as to achieve the effect of reducing the splashing noise in the silencing cover, and at the same time take into account the ventilation effect of the cooling tower.

Description

Technical Field

[0001] This application relates to the field of noise control devices, and particularly to a noise reduction device for cooling towers. Background Art

[0002] Noise control is essential for existing industrial environmental protection. There are various forms of cooling towers with the same principle. The heat-exchanged hot water is pumped to the top of the cooling tower by a water pump and then drops like rain. The bottom of the cooling tower is supported by multiple columns, forming natural heat dissipation gaps, i.e., heat dissipation outlets. Together with the heat dissipation fans at the top of the cooling tower, the outside cold air is drawn into the cooling tower to dissipate the heat of the hot water, and then the cold water is recycled in the reservoir below to achieve the recycling of water resources. The noise generated by the cooling tower comes from the noise emitted from the gaps after the water drops to the bottom of the cooling tower, that is, the splashing noise.

[0003] In the related art, in order to control the splashing noise of the cooling tower, a sound barrier made of a metal enclosure is used for noise reduction. However, to ensure the ventilation effect of the cooling tower, multiple ventilation gaps are provided on the metal enclosure, and there is a certain distance between the metal enclosure and the cooling tower, resulting in some splashing noise escaping from the metal enclosure, and the noise reduction effect of the sound barrier is poor. Summary of the Invention

[0004] In order to balance the noise reduction and ventilation effects of the cooling tower, this application provides a noise reduction device for cooling towers.

[0005] A noise reduction device for cooling towers provided by this application adopts the following technical solutions:

[0006] A noise reduction device for cooling towers includes a silencing cover and at least two noise reduction fans; the silencing cover is used to be installed at the heat dissipation outlet position at the bottom of the cooling tower and cover the heat dissipation outlet to form a silencing cavity; at least two of the noise reduction fans are installed on the silencing cover; when the noise reduction fans are started, the airflows generated by at least two of the noise reduction fans converge at the heat dissipation outlet position at the bottom of the silencing cavity and enter the heat dissipation outlet.

[0007] By adopting the above technical solutions, when the noise reduction fans are started, the noise reduction fans draw the external airflow to the heat dissipation outlet at the bottom of the cooling tower. According to the law of refraction, refraction is determined by the speed of sound, and the splashing noise of the cooling tower is transmitted to the outside through the heat dissipation outlet. At this time, under the action of the noise reduction fans, the advancing direction of the sound wave is opposite to the wind speed, and the speed of sound will be weakened by the wind speed. Moreover, for sound waves, air with different densities has different refractive indices. Therefore, the airflow is used to make the sound wave refract to achieve the purpose of noise reduction. In addition, the introduction of the noise reduction fans also increases the air intake of the cooling tower. Based on this, through the silencing cover and the noise reduction fans, the noise reduction and ventilation effects of the cooling tower are balanced.

[0008] Optionally, the sound silencing cover is of an annular structure; an installation opening is formed in the side wall of the sound silencing cover, and the number of the installation openings corresponds to the number of the noise reduction blowers, and the noise reduction blowers are installed at the positions of the sound silencing cover corresponding to the installation openings; a wind dividing ridge is installed on the inner wall of the sound silencing cover, the number of the wind dividing ridges corresponds to the number of the installation openings, and the wind dividing ridges are arranged opposite to the installation openings; the wind dividing ridges are used for diverting the air flow generated by the noise reduction blowers.

[0009] By adopting the above technical solution, the annular sound silencing cover enables the sound silencing cover to cover all the heat dissipation openings on the peripheral side of the bottom of the cooling tower. Further, through the wind dividing ridges, the air flow of one noise reduction blower can be divided into two in the sound silencing cavity, so as to reduce the installation quantity of the noise reduction blowers, reduce the manufacturing cost, and while reducing the installation quantity of the noise reduction blowers, meet the noise reduction and ventilation requirements of multiple heat dissipation openings on the peripheral side of the bottom of the cooling tower.

[0010] Optionally, a wind distribution ridge is flexibly connected to the side wall of the wind dividing ridge close to the installation opening; a swinging mechanism is installed on the sound silencing cover; the swinging mechanism is used for controlling the wind distribution ridge to swing relative to the wind dividing ridge; when the wind distribution ridge swings, the gas flow rates on both sides of the wind dividing ridge change.

[0011] By adopting the above technical solution, by using the swinging mechanism and the wind distribution ridge, the effect of proportioning different gas flow rates at different positions in the sound silencing cavity is realized. In this way, under the synchronous start of multiple noise reduction blowers, the gas flow rate at different positions in the sound silencing cavity can be adjusted to achieve different degrees of noise reduction effects in different orientations of the cooling tower. Further, when the performance of some noise reduction blowers deteriorates, the adjacent noise reduction blowers can be used, and the wind distribution ridge with the adjusted swinging angle can be used to make up for the risk of reduction in the noise reduction effect caused by the deterioration of the performance of some noise reduction blowers.

[0012] Optionally, an operation cavity is formed by concave inward at the position of the outer wall of the sound silencing cover corresponding to the wind dividing ridge; the swinging mechanism is installed on the outer wall of the sound silencing cover; an activity opening is formed in the side wall of the wind dividing ridge close to the installation opening, and the wind distribution ridge passes through the activity opening; the connection point between the swinging mechanism and the wind distribution ridge is located in the operation cavity.

[0013] By adopting the above technical solution, since the noise reduction effect of this noise reduction device is achieved by using air flow, during the operation of the cooling tower, there is a continuously flowing high-speed air flow in the sound silencing cavity. And the connection point between the swinging mechanism and the wind distribution ridge is in the operation cavity, that is, outside the sound silencing cavity. In this way, the risk of damage to the connection point between the swinging mechanism and the wind distribution ridge by the high-speed air flow in the sound silencing cavity is reduced, and the connection stability between the swinging mechanism and the wind distribution ridge is improved.

[0014] Optionally, the swing mechanism includes a rotating column, a pulling rope, and a tying block; the rotating column is installed on the side wall of the air distribution ridge located in the operation cavity; the rotating column is rotatably connected to the side wall of the sound insulation cover located in the operation cavity; there are two pulling ropes, and the two pulling ropes are respectively located on both sides of the rotating column; the tying block is installed on the outer wall of the sound insulation cover and is used for the pulling rope to wind and tie.

[0015] By adopting the above technical solution, when pulling one pulling rope, the air distribution ridge will tilt towards the side where the pulling rope is pulled. In this way, by using two pulling ropes and the rotating column, the effect of the air distribution ridge swinging in the sound insulation cavity is achieved. After determining the swinging angle of the air distribution ridge, the pulling rope is wound and tied to the tying block to achieve the effect of fixing the swinging angle of the air distribution ridge.

[0016] Optionally, the swing mechanism includes a hinge frame, a screw rod, and a connecting piece; there are two hinge frames, and both of the two hinge frames are hinged to the air distribution ridge; the number of screw rods corresponds to the number of hinge frames; the screw rods are rotatably connected to the hinge frames; the connecting piece is installed on the outer wall of the sound insulation cover; a threaded hole is penetrated through the surface of the connecting piece; the threaded hole is used for the screw rod to be threadedly connected.

[0017] By adopting the above technical solution, when rotating the screw rod relative to the connecting piece, the screw rod will drive the hinge frame to move up and down. Since the hinge frame is hinged to the air distribution ridge and the screw rod is rotatably connected to the hinge frame, the effect of the air distribution ridge swinging in the sound insulation cavity is achieved by using two hinge frames with a height difference, and the effect of fixing the swinging angle of the air distribution ridge is achieved by using the threaded connection between the screw rod and the connecting piece.

[0018] Optionally, an observation window is provided on the side wall of the sound insulation cover, and an angle scale is provided on the observation window.

[0019] By adopting the above technical solution, it is convenient for the operator to observe the swinging angle of the air distribution ridge in the sound insulation cavity, so as to control the operation mode of the swing mechanism and accurately adjust the gas flow at different positions in the sound insulation cavity.

[0020] Optionally, an elastic sleeve is connected to the side wall of the air distribution ridge close to the installation port; one end of the elastic sleeve wraps the air distribution ridge, and the other end is connected to the side wall of the air distribution ridge; grooves are provided on the side walls of the air distribution ridge and the air distribution ridge, and the grooves are used for the end edges of the elastic sleeve to be embedded.

[0021] By adopting the above technical solution, on the one hand, the setting of the elastic sleeve realizes the flexible connection between the air distribution ridge and the air distribution ridge. On the other hand, since there is a continuously flowing high-speed air flow in the sound insulation cavity during the operation of the cooling tower, through the grooves, the two ends of the elastic sleeve can be firmly connected to the air distribution ridge and the air distribution ridge, reducing the risk that the high-speed air flow forces the elastic sleeve to separate from the air distribution ridge and the air distribution ridge.

[0022] Optionally, a plurality of convex ribs are provided on the outer wall of the elastic sleeve, the convex ribs extend along the length direction of the air distribution ridge, and the plurality of convex ribs are arranged along the height of the air distribution ridge.

[0023] By adopting the above technical solution, during the swinging process of the air distribution ridge, the elastic sleeve deforms and thick and thin regions will appear. Through the plurality of convex ribs, not only can the outer side of the elastic sleeve be protected, reducing the risk of damage to the thin region of the elastic sleeve caused by gas impact, but also the air flow blowing towards the elastic sleeve can form a turbulent flow on the peripheral side of the elastic sleeve, reducing the damage of the wind force to the elastic sleeve.

[0024] Optionally, an elbow is movably connected to the outer wall of the muffler cover; the number of the elbows corresponds to the number of the noise reduction fans; the elbows are located at the positions of the noise reduction fans; when the noise reduction fans are started, the air flow sequentially passes through the elbows and the noise reduction fans and enters the muffler cavity.

[0025] By adopting the above technical solution, on the one hand, the risk of an external object being sucked towards the noise reduction fan and causing the wind force of the noise reduction fan to weaken is reduced. On the other hand, the noise generated by the noise reduction fan can also be reduced during the operation of the noise reduction fan under the action of the elbow guiding the air flow.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. Through the noise reduction fan and the muffler cover, the air flow of the noise reduction fan is opposite to the advancing direction of the sound wave. The air flow is used to refract the sound wave to achieve the noise reduction purpose, and the air flow of the noise reduction fan also increases the air intake of the cooling tower, achieving both the noise reduction and ventilation effects of the cooling tower;

[0028] 2. Through the swinging mechanism and the air distribution ridge, the effect of proportioning different gas flows at different positions in the muffler cavity is achieved. Under the synchronous start of a plurality of noise reduction fans, the gas flow at different positions in the muffler cavity can be adjusted to achieve different degrees of noise reduction effects at different orientations of the cooling tower;

[0029] 3. Through the elbow, on the one hand, the risk of an external object being sucked towards the noise reduction fan and causing the wind force of the noise reduction fan to weaken is reduced. On the other hand, the noise generated by the noise reduction fan can also be reduced during the operation of the noise reduction fan under the action of the elbow guiding the air flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is the overall structural schematic diagram of Embodiment 1.

[0031] Figure 2 is the exploded structural schematic diagram of Embodiment 1.

[0032] Figure 3It is a schematic diagram showing the installation position of the air distribution ridge in Embodiment 1.

[0033] Figure 4 It is Figure 3 an enlarged schematic diagram of part A.

[0034] Figure 5 It is a schematic diagram showing the state where the swing mechanism drives the air distribution ridge to swing in Embodiment 1.

[0035] Figure 6 It is a schematic diagram of the overall structure of Embodiment 2.

[0036] Explanation of reference numerals: 1, silencing cover; 11, silencing cavity; 12, installation opening; 13, observation window; 2, noise reduction fan; 3, heat dissipation fan; 4, elbow; 5, air distribution ridge; 51, movable opening; 6, elastic sleeve; 61, convex rib; 7, air distribution ridge; 8, groove; 9, swing mechanism; 91, rotating column; 92, pulling rope; 93, binding block; 94, hinge frame; 95, screw; 96, connecting piece; 961, threaded hole; 10, operation cavity. Detailed implementation manners

[0037] The following Figures 1-6 further elaborates on this application in detail.

[0038] An embodiment of this application discloses a noise reduction device for a cooling tower, aiming to achieve both noise reduction and ventilation effects for the cooling tower.

[0039] Embodiment 1

[0040] Referring to Figure 1 and Figure 2 , a noise reduction device for a cooling tower includes a silencing cover 1 and at least two noise reduction fans 2. The silencing cover 1 is used to be installed at the heat dissipation opening position at the bottom of the cooling tower and forms a silencing cavity 11 by covering the heat dissipation opening. At least two noise reduction fans 2 are both installed on the silencing cover 1. When the noise reduction fans 2 are started, the airflows generated by at least two noise reduction fans 2 converge at the heat dissipation opening position at the bottom of the silencing cavity 11 and enter the heat dissipation opening, and the refraction of sound waves is achieved by using the airflows, so as to achieve both noise reduction and ventilation effects for the cooling tower.

[0041] Specifically, the top of the cooling tower is provided with a heat dissipation fan 3. The heat dissipation fan 3 is paired with the heat dissipation opening at the bottom of the cooling tower to allow the cold air from the outside to enter the inside of the cooling tower and cool the hot water inside the cooling tower. It should be noted that the gas flow rate through the noise reduction fan 2 is greater than the gas flow rate through the heat dissipation fan 3 to ensure that the airflows generated by at least two noise reduction fans 2 can converge at the heat dissipation opening position at the bottom of the cooling tower and enter the heat dissipation opening.

[0042] The sound insulation cover 1 is a ring structure, and the sound insulation cover 1 can be understood as a ring channel. The side wall of the sound insulation cover 1 is provided with an installation opening 12. The number of the installation openings 12 corresponds to the number of the noise reduction blowers 2. It is worth mentioning that for the number of the noise reduction blowers 2, if the number of the noise reduction blowers 2 is two, the two noise reduction blowers 2 are arranged oppositely, and when the number of the noise reduction blowers 2 is greater than or equal to three, the noise reduction blowers 2 will no longer be arranged oppositely in pairs. For the convenience of understanding, in the embodiment of the present application, the number of the noise reduction blowers 2 is four. Correspondingly, the number of the installation openings 12 is also four, and the installation openings 12 face the top of the cooling tower. The noise reduction blowers 2 are fixed at the positions of the sound insulation cover 1 where the installation openings 12 are located, and the heat dissipation openings of the cooling tower are located between two adjacent noise reduction blowers 2.

[0043] A bent pipe 4 is movably connected to the outer wall of the sound insulation cover 1. The number of the bent pipes 4 corresponds to the number of the noise reduction blowers 2, and the bent pipes 4 are located at the positions of the noise reduction blowers 2. The movable connection manner between the bent pipe 4 and the sound insulation cover 1 can be flange connection, rotational connection, or magnetic attraction connection. When the noise reduction blowers 2 are started, the air flow sequentially passes through the bent pipes 4 and the noise reduction blowers 2 and enters the sound insulation cavity 11. The purpose of designing the bent pipe 4 is to reduce the risk that an external object is sucked towards the noise reduction blower 2, resulting in the weakening of the wind force of the noise reduction blower 2, and the noise generated by the noise reduction blower 2 can also be reduced during the operation of the noise reduction blower 2 under the action of the bent pipe 4 guiding the air flow.

[0044] At the same time, referring to Figure 3 and Figure 4 , a wind dividing ridge 5 is fixed on the inner wall of the sound insulation cavity 11 of the sound insulation cover 1. The number of the wind dividing ridges 5 is also four, and they are arranged oppositely to the installation openings 12. The wind dividing ridge 5 is used to divide the air flow blown into the sound insulation cavity 11 by the noise reduction blowers 2 into two strands. An elastic sleeve 6 is arranged on the side wall of the wind dividing ridge 5 close to the installation opening 12. One end of the elastic sleeve 6 is connected to the side wall of the wind dividing ridge 5, and the other end is connected to a wind distribution ridge 7. The structure of the wind distribution ridge 7 can be understood as a triangular prism, and one edge of the triangular prism faces the installation opening 12. Grooves 8 are formed on the side walls of the wind dividing ridge 5 and the wind distribution ridge 7. The end edge of the elastic sleeve 6 is embedded in the grooves 8, so that the two ends of the elastic sleeve 6 can be firmly connected to the wind dividing ridge 5 and the wind distribution ridge 7, reducing the risk that the high-speed air flow forces the elastic sleeve 6 to separate from the wind dividing ridge 5 and the wind distribution ridge 7.

[0045] A plurality of convex ridges 61 are integrally formed on the outer wall of the elastic sleeve 6. The cross section of the convex ridges 61 is semicircular. The convex ridges 61 extend along the length direction of the wind dividing ridge 5, and the plurality of convex ridges 61 are arranged along the height of the wind dividing ridge 5, so that the air flow blowing towards the elastic sleeve 6 can form a turbulent flow on the periphery of the elastic sleeve 6, reducing the damage of the wind force to the elastic sleeve 6.

[0046] A swing mechanism 9 is installed on the silencing cover 1. The swing mechanism 9 is used to control the swing of the air distribution ridge 7 relative to the air dividing ridge 5, so as to change the gas flow rates on both sides of the air dividing ridge 5 through the swinging air distribution ridge 7. The significance of designing the air distribution ridge 7 lies in that: when multiple noise reduction fans 2 are started synchronously, the gas flow rates at different positions in the silencing cavity 11 can be adjusted to achieve different degrees of noise reduction effects in different orientations of the cooling tower. And when the performance of some noise reduction fans 2 deteriorates, the adjacent noise reduction fans 2 can be used, combined with the air distribution ridge 7 with adjusted swing angles, to make up for the risk of reduced noise reduction effects caused by the deterioration of the performance of some noise reduction fans 2.

[0047] Continue to refer to Figure 4 and Figure 5 , observation windows 13 are provided on the side wall of the silencing cover 1. The number of observation windows 13 corresponds to the number of air dividing ridges 5. The observation windows 13 are located at the positions of the air dividing ridges 5. Angular scales are provided on the observation windows 13, so as to facilitate the operator to observe the swing angle of the air distribution ridge 7 in the silencing cavity 11, thereby controlling the operation mode of the swing mechanism 9 and accurately adjusting the gas flow rates at different positions in the silencing cavity 11.

[0048] An operation cavity 10 is formed by concave inward on the outer wall of the silencing cover 1 at the position of the air dividing ridge 5. The swing mechanism 9 is installed on the outer wall of the silencing cover 1. An activity port 51 is opened on the side wall of the air dividing ridge 5 close to the installation port 12. The activity port 51 allows the air distribution ridge 7 to pass through. The connection point between the swing mechanism 9 and the air distribution ridge 7 is located in the operation cavity 10.

[0049] Refer to Figure 3 and Figure 4 , the swing mechanism 9 includes a rotating column 91, a pulling rope 92 and a binding block 93. The rotating column 91 is fixed to the side wall of the air distribution ridge 7 located in the operation cavity 10. The rotating column 91 is rotatably connected to the side wall of the silencing cover 1 located in the operation cavity 10. Two pulling ropes 92 are provided. The two pulling ropes 92 are respectively located on both sides of the rotating column 91. The binding block 93 is fixed to the outer wall of the silencing cover 1 and is used for the pulling ropes 92 to be wound and tied. When operating the swing mechanism 9, pulling one pulling rope 92, the air distribution ridge 7 will tilt towards the side where the pulling rope 92 is pulled. In this way, by using the two pulling ropes 92 and the rotating column 91, the effect of the air distribution ridge 7 swinging in the silencing cavity 11 is achieved. After determining the swing angle of the air distribution ridge 7, the pulling rope 92 is wound and tied to the binding block 93 to achieve the effect of fixing the swing angle of the air distribution ridge 7.

[0050] In other embodiments, the binding block 93 is rotatably connected to the silencing cover 1. A ratchet wheel is provided on the binding block 93, and ratchet teeth are provided on the silencing cover 1. The one-way rotation of the binding block 93 and the silencing cover 1 is realized by using the ratchet wheel and ratchet teeth. With such a design, after the pulling rope 92 is tied to the binding block 93, rotating the binding block 93 can further finely adjust the swing angle of the air distribution ridge 7.

[0051] The implementation principle of Embodiment 1 is as follows: According to the law of refraction, refraction is determined by the sound speed. The splashing noise of the cooling tower is transmitted to the outside through the heat dissipation openings. At this time, under the action of the noise reduction fan 2, the advancing direction of the sound wave is opposite to the wind speed, and the sound speed will be weakened by the wind speed. Moreover, for sound waves, air with different densities has different refractive indices. Thus, the air flow is used to cause the sound wave to refract, achieving the purpose of noise reduction while taking into account the ventilation effect of the cooling tower. Further, through the swinging mechanism 9 and the air distribution ridge 7, by changing the swinging angle of the air distribution ridge 7 in the sound absorption cavity 11, the gas flow rate at different positions in the sound absorption cavity 11 can be adjusted. And when adjusting the gas flow rate, noise meters can be set at different positions to measure the noise levels in different directions with the cooling tower as the sound source center, and the swinging angle of the air distribution ridge 7 can be adaptively adjusted to achieve different degrees of noise reduction effects in different directions of the cooling tower.

[0052] Embodiment 2

[0053] Referring to Figure 6 , the difference between this embodiment and Embodiment 1 is that the swinging mechanism 9 includes a hinge frame 94, a screw 95 and a connecting piece 96. Among them, there are two hinge frames 94, and both hinge frames 94 are hinged to the surface of the air distribution ridge 7 passing through the movable opening 51. The number of screws 95 corresponds to the number of hinge frames 94, and the screws 95 are rotatably connected to the hinge frames 94. The connecting piece 96 is fixed to the outer wall of the sound absorption cover 1, and a threaded hole 961 is formed through the surface of the connecting piece 96, and the threaded hole 961 is used for the screw 95 to be threadedly connected.

[0054] The implementation principle of Embodiment 2 is as follows: Rotate the two screws 95 respectively, and the two screws 95 will drive the hinge frames 94 to move up and down. Since the hinge frames 94 are hinged to the air distribution ridge 7 and the screws 95 are rotatably connected to the hinge frames 94, the effect of the air distribution ridge 7 swinging in the sound absorption cavity 11 is achieved by using the two hinge frames 94 with different height differences, and the effect of fixing the swinging angle of the air distribution ridge 7 is achieved by using the threaded connection between the screw 95 and the connecting piece 96. Further, since the air distribution ridge 7 is flexibly connected to the air distribution ridge 5 and the air distribution ridge 7 is hinged to the hinge frame 94, the two hinge frames 94 with different height differences will enlarge the swinging angle of the air distribution ridge 7, thereby improving the problem of the small swinging angle of the air distribution ridge 7.

[0055] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A noise reduction device for a cooling tower, characterized in that: It includes a sound insulation cover (1) and at least two noise reduction fans (2); the sound insulation cover (1) is used to be installed at the heat dissipation opening position at the bottom of the cooling tower and cover the heat dissipation opening to form a sound insulation cavity (11); at least two of the noise reduction fans (2) are installed on the sound insulation cover (1); when the noise reduction fans (2) are started, the airflows generated by at least two of the noise reduction fans (2) converge at the heat dissipation opening position at the bottom of the sound insulation cavity (11) and enter the heat dissipation opening; the sound insulation cover (1) is of an annular structure; an installation opening (12) is provided on the side wall of the sound insulation cover (1), and the number of the installation openings (12) corresponds to the number of the noise reduction fans (2), and the noise reduction fans (2) are installed at the positions of the sound insulation cover (1) where the installation openings (12) are located; a wind distribution ridge (5) is installed on the inner wall of the sound insulation cover (1) of the sound insulation cover (1), the number of the wind distribution ridges (5) corresponds to the number of the installation openings (12), and is arranged opposite to the installation openings (12); the wind distribution ridge (5) is used to distribute the airflows generated by the noise reduction fans (2); a wind distribution matching ridge (7) is flexibly connected to the side wall of the wind distribution ridge (5) close to the installation opening (12); a swing mechanism (9) is installed on the sound insulation cover (1); the swing mechanism (9) is used to control the swing of the wind distribution matching ridge (7) relative to the wind distribution ridge (5); when the wind distribution matching ridge (7) swings, the gas flow rates on both sides of the wind distribution ridge (5) change.

2. The noise reduction device for a cooling tower according to claim 1, characterized in that: An operation cavity (10) is formed by concave inward on the outer wall of the sound insulation cover (1) at the position of the wind distribution ridge (5); the swing mechanism (9) is installed on the outer wall of the sound insulation cover (1); an activity opening (51) is provided on the side wall of the wind distribution ridge (5) close to the installation opening (12), and the wind distribution matching ridge (7) passes through the activity opening (51); the connection point of the swing mechanism (9) and the wind distribution matching ridge (7) is located in the operation cavity (10).

3. The noise reduction device for a cooling tower according to claim 2, characterized in that: The swing mechanism (9) includes a rotating column (91), a pull rope (92) and a binding block (93); the rotating column (91) is installed on the side wall of the wind distribution matching ridge (7) located in the operation cavity (10); the rotating column (91) is rotatably connected to the side wall of the sound insulation cover (1) located in the operation cavity (10); two pull ropes (92) are provided, and the two pull ropes (92) are respectively located on both sides of the rotating column (91); the binding block (93) is installed on the outer wall of the sound insulation cover (1) and is used for the pull ropes (92) to wind and bind.

4. The noise reduction device for a cooling tower according to claim 2, wherein: The swing mechanism (9) includes a hinge frame (94), a screw rod (95) and a connecting piece (96); there are two hinge frames (94), and both of the two hinge frames (94) are hinged to the air distribution ridge (7); the number of the screw rods (95) corresponds to the number of the hinge frames (94); the screw rods (95) are rotatably connected to the hinge frames (94); the connecting piece (96) is installed on the outer wall of the silencing cover (1); a threaded hole (961) is formed through the surface of the connecting piece (96); the threaded hole (961) is used for threaded connection with the screw rod (95).

5. A cooling tower noise reduction device according to any one of claims 1 to 4, characterized in that: An observation window (13) is provided on the side wall of the silencing cover (1), and a protractor scale is provided on the observation window (13).

6. The noise reduction device for a cooling tower according to claim 1, wherein: An elastic sleeve (6) is connected to the side wall of the air distribution ridge (5) close to the installation opening (12); one end of the elastic sleeve (6) wraps the air distribution ridge (5), and the other end is connected to the side wall of the air distribution ridge (7); grooves (8) are formed on the side walls of the air distribution ridge (5) and the air distribution ridge (7), and the end edges of the elastic sleeve (6) are embedded in the grooves (8).

7. The noise reduction device for a cooling tower according to claim 6, characterized in that: A plurality of convex ribs (61) are provided on the outer wall of the elastic sleeve (6), the convex ribs (61) extend along the length direction of the air distribution ridge (5), and the plurality of convex ribs (61) are arranged along the height of the air distribution ridge (5).

8. The noise reduction device for a cooling tower according to claim 1, characterized in that: A bent pipe (4) is movably connected to the outer wall of the silencing cover (1); the number of the bent pipes (4) corresponds to the number of the noise reduction blowers (2); the bent pipes (4) are located at the positions of the noise reduction blowers (2); when the noise reduction blowers (2) are started, the air flow sequentially passes through the bent pipes (4) and the noise reduction blowers (2) and enters the silencing cavity (11).

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