Louvers and cooling towers

Abstract

This design enables the creation of louvers and cooling towers that can adjust sound insulation performance and energy consumption to suit the specific needs of each individual cooling tower. [Solution] A louver 1 attached to the intake port 16 of a cooling tower, characterized by comprising a base material 2 whose base end is attached to the intake port 16, and a soundproofing member 3 provided on the far end side of the base material 2 so as to be able to change the angle θ it makes with the base material 2.

Description

Technical Field

[0001] The present invention relates to a louver attached to an air inlet of a cooling tower, and a cooling tower provided with such a louver.

Background Art

[0002] A cooling tower is a device widely used for cooling industrial water, air conditioning water, etc. In a cooling tower, water to be cooled is sprayed onto a filler to increase the surface area, air is circulated through the filler to bring about contact between water and air, and heat exchange between water and air and the latent heat of vaporization of water are utilized to achieve cooling of water. From the above operating principle, in a cooling tower, noises such as those generated when water flows through the filler and those associated with the operation of a blower for circulating air are generated, and measures may be required against these noises.

[0003] For example, Japanese Utility Model Laid-Open Publication No. 57-36468 (Patent Document 1) discloses a cooling tower provided with a suction-side soundproof chamber having a bent passage. In the invention described in Patent Document 1, by bending the path of the suction port, noise leakage from the suction port is suppressed. Also, Japanese Utility Model Laid-Open Publication No. 52-151001 (Patent Document 2) discloses a cooling tower provided with a louver bent in an L shape at an air intake.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Incidentally, the usage of cooling towers varies widely. For example, comparing a cooling tower installed near the boundary of a factory site with one installed in the center of the site, the need for soundproofing to suppress noise damage to the outside is greater for the former. Also, the need for soundproofing can change depending on the time of day, for example, depending on the type of facilities located in the surrounding area. Thus, the need for soundproofing in a cooling tower is case by case, but it was difficult to achieve soundproofing that was tailored to the specific circumstances of each cooling tower with the technologies disclosed in Patent Documents 1 and 2.

[0006] Furthermore, the technologies disclosed in Patent Documents 1 and 2 sometimes resulted in increased energy consumption as a result of complicating the airflow path in order to suppress noise. In other words, the technologies disclosed in Patent Documents 1 and 2 could not adjust the balance between sound insulation performance and energy consumption in a cooling tower.

[0007] Therefore, there is a need to realize louvers and cooling towers that can adjust sound insulation performance and energy consumption to suit the specific circumstances of each cooling tower. [Means for solving the problem]

[0008] The louver according to the present invention is a louver attached to the intake port of a cooling tower, and is characterized by comprising a base material whose base end is attached to the intake port, and a sound-insulating member provided on the far end side of the base material so as to be able to change the angle it makes with the base material.

[0009] The cooling tower according to the present invention is a cooling tower equipped with a louver at an air intake, characterized in that the louver comprises a base material whose base end is attached to the air intake, and a soundproofing member provided on the far end side of the base material so as to be able to change the angle it makes with the base material.

[0010] With these configurations, the sound insulation performance and energy consumption of the cooling tower can be adjusted by changing the angle between the base material and the sound insulation member. Therefore, it is easier to meet the different performance requirements for sound insulation and energy consumption depending on the user and usage conditions.

[0011] Preferred embodiments of the present invention will be described below. However, the scope of the present invention is not limited by the examples of preferred embodiments described below.

[0012] In one embodiment, the louver according to the present invention preferably has a sound-absorbing material as its base material.

[0013] This configuration may result in better sound insulation performance.

[0014] In one embodiment, the louver according to the present invention further comprises a support member that supports the sound-insulating member at the far end of the base material, wherein the support member has a fixing device that fixes the orientation of the sound-insulating member, and the position of the fixing device can be selected from a plurality of positions.

[0015] This configuration allows for easy and highly reproducible adjustment of the soundproofing components' position. Therefore, soundproofing performance and energy consumption can be easily and reproducibly adjusted.

[0016] In one embodiment of the louvers according to the present invention, it is preferable that the sound-insulating member includes water-repellent glass wool.

[0017] This configuration may result in better sound insulation performance.

[0018] In one embodiment, the louver according to the present invention comprises a plurality of sets of the base material and the sound-insulating member, wherein the length of at least one set of the sound-insulating member extending from the far end side of the base material of that set is preferably 80% to 120% of the distance between the base material and the base material of another set provided below that set.

[0019] According to this configuration, when the present invention is used with particular emphasis on sound insulation performance, good sound insulation performance can be achieved.

[0020] As one aspect, the louver according to the present invention preferably has the sound insulation member provided so that the angle formed with the base material can be 60° or more and 150° or less.

[0021] According to this configuration, it is possible to provide a sufficient range for adjusting the sound insulation performance and the energy consumption cost, so it is easier to meet the required performance.

[0022] Further features and advantages of the present invention will become more apparent from the following description of exemplary and non-limiting embodiments described with reference to the drawings.

Brief Description of the Drawings

[0023] [Figure 1] It is a longitudinal sectional view of a cooling tower according to an embodiment. [Figure 2] It is a side perspective view of a cooling tower according to an embodiment. [Figure 3] It is a longitudinal sectional view of a louver according to an embodiment. [Figure 4] It is a plan view of the base material of a louver according to an embodiment. [Figure 5] It is a plan view of the sound insulation member of a louver according to an embodiment. [Figure 6] It is a view showing one of the attitudes (θ = 60°) that the sound insulation member can take in the louver according to the embodiment. [Figure 7] It is a view showing one of the attitudes (θ = 90°) that the sound insulation member can take in the louver according to the embodiment. [Figure 8] It is a view showing one of the attitudes (θ = 120°) that the sound insulation member can take in the louver according to the embodiment. [Figure 9] It is a view showing one of the attitudes (θ = 150°) that the sound insulation member can take in the louver according to the embodiment. [Figure 10] It is a longitudinal sectional view of a test apparatus used for noise measurement of an example. [Figure 11] This is a longitudinal cross-sectional view of the test apparatus used for measuring pressure loss in the embodiment. [Modes for carrying out the invention]

[0024] Embodiments of the louvers and cooling tower according to the present invention will be described with reference to the drawings. Below, an example in which the present invention is applied to a cooling tower 10 and a louver 1 provided on the cooling tower 10 will be described.

[0025] [Cooling tower configuration] The cooling tower 10 according to this embodiment is a device that cools water to be cooled by utilizing heat exchange with air taken in from the outside and the vaporization of the water itself. The cooling tower 10 comprises a blower 11 that generates a driving force to take in air from the outside, a water spraying device 12 that sprays the water to be cooled, a packing material 13 that functions as a place where the water sprayed by the water spraying device 12 comes into contact with the air, an eliminator 14 that prevents water from being brought from the packing material 13 into the blower 11, and a housing 15 that houses the packing material 13 and the eliminator 14 and defines the space below the blower 11 (Figure 1). The housing 15 is fixed to a concrete foundation B.

[0026] An air intake port 16 is provided on the outer circumference of the housing 15, and the packing material 13 is positioned on the inside of the housing 15 facing the air intake port 16. The air intake port 16 is defined by the housing 15. The air intake port 16 is provided with a louver 1 on the outside of the housing 15 according to this embodiment. Figure 1 is a cross-sectional view (vertical cross-section) of the cooling tower 10 in a plane perpendicular to the installation surface.

[0027] The cooling tower 10 is a so-called cross-flow type cooling tower. In the cooling tower 10, the water to be cooled is sprayed from a water sprayer 12 located at the top of the housing 15 and flows through the packing material 13 to the bottom of the housing 15. Meanwhile, air enters the housing 15 from the air intake 16, passes through the packing material 13 and eliminator 14 in a substantially horizontal direction, and is then discharged upward by the blower 11. Therefore, in the packing material 13, water flows substantially vertically, and air flows substantially horizontally. A cooling tower in which the directions of water and air flow intersect in this manner is called a cross-flow type cooling tower.

[0028] Of the components of the cooling tower 10, all except the louvers 1 may be components of a known cross-flow type cooling tower. The blower 11 may be a device that drives blades made of a material such as fiber-reinforced plastic (FRP) with a motor. The water spraying device 12 may be a combination of a pump, piping, nozzles, etc. The packing material 13 may be made of a resin such as polyvinyl chloride or polypropylene in terms of material, and may be of a film type or splash type in terms of structure. The eliminator 14 may be made of a resin such as polyvinyl chloride. The housing 15 may be a structure that uses structural materials such as metal or resin individually or in appropriate combinations. The cooling tower 10 may also be further equipped with ancillary components such as walkways, doors, stairs, ladders, and instruments such as hydraulic gauges for the passage of maintenance personnel.

[0029] [Louver configuration] The louver 1 according to this embodiment is attached to the air intake port 16 of the cooling tower 10 (Figures 1 to 3). The louver 1 comprises a base material 2, a soundproofing member 3, and a support member 4. Figure 3 is a cross-sectional view (longitudinal cross-section) of the cooling tower 10 in a plane perpendicular to the installation surface. In the following description, for each member of the louver 1, the side closer to the air intake port 16 is referred to as the base end, and the side further from the air intake port 16 is referred to as the far end.

[0030] In the louver 1, the base end of the base material 2 is attached to the air intake port 16, and the soundproofing member 3 is provided on the far end of the base material 2. More specifically, the base end of the base material 2 is attached to the part of the housing 15 that defines the outer edge of the air intake port 16. Even more specifically, the base end of the base material 2 is attached to a support column 15a (which is part of the housing 15) erected on the surface of the cooling tower 10 where the air intake port 16 is open (Figure 2).

[0031] The louver 1 comprises multiple sets of base material 2 and soundproofing member 3, with the far end of each base material 2 and the base end of each soundproofing member 3 supported by a single support member 4. Thus, each base material 2 is cantilevered by the housing 15 and the support member 4, while the soundproofing member 3 is cantilevered by the support member 4. The support member 4 is fixed to the same foundation B as the cooling tower 10.

[0032] The base material 2 is a component whose base end is attached to the air intake port 16. Figure 4 is a plan view of the base material 2 in a state removed from the air intake port 16. The base material 2 comprises an outer casing 21 that defines the outer shape of the base material 2, and sound-absorbing material 22 housed in the outer casing 21. The outer casing 21 has a mounting portion 21a that is attached to the support column 15a. The outer casing 21 can be made of metal such as stainless steel or resin such as fiber-reinforced plastic (FRP). The outer casing 21 may be made of a single material or of multiple materials. Furthermore, the outer casing 21 may be made of a single part or of multiple parts. For example, the upper part of the outer casing 21 may be made of iron plate, corrugated sheet metal, stainless steel plate, etc., and the lower part of the outer casing 21 may be made of wire mesh, perforated plate, etc. However, for simplicity, the upper part of the outer casing 21 is omitted in Figure 3.

[0033] The sound-absorbing material 22 is made from a material that has the function of attenuating sound, processed into a sheet shape with dimensions that fit the inner dimensions of the outer casing 21. The material of the sound-absorbing material 22 may be, for example, glass wool, urethane sponge, or rock wool. Since the sound-absorbing material 22 may get wet from water splashing from the filler material 13, or from natural phenomena such as rain, snow, or fog, it is preferable that it has water-repellent properties. Therefore, it is preferable that the sound-absorbing material 22 includes a material that has been treated with a water-repellent coating, and it is more preferable that it includes water-repellent glass wool.

[0034] In this embodiment, multiple base members 2 are installed approximately parallel to each other in the vertical cross-sectional view (Figures 1 and 3). Each base member 2 extends approximately 45° upward with respect to the horizontal plane. The spacing L1 between each base member 2 is approximately 30 cm. Note that the spacing L1 refers to the shortest distance between two adjacent base members 2, as shown in Figure 3.

[0035] The soundproofing member 3 is a member provided on the far end side of the base material 2 and is cantilevered by the support member 4. Figure 5 is a plan view of the soundproofing member 3 in a state removed from the support member 4. The soundproofing member 3 comprises an outer casing 31 that defines the outer shape of the soundproofing member 3 and a sound-absorbing material 32 housed in the outer casing 31. The outer casing 31 has two sets of through holes 33 and 34 that are fixed to the support member 4. The outer casing 31 can be made of metal such as stainless steel or resin such as fiber-reinforced plastic (FRP). The outer casing 31 may be made of a single material or multiple materials. Also, the outer casing 31 may be made of a single part or multiple parts. For example, the member that makes up the upper surface of the outer casing 31 may be an iron plate, corrugated sheet, stainless steel plate, etc., and the member that makes up the lower surface of the outer casing 31 may be a wire mesh, perforated plate, etc. However, for simplicity, the member of the upper surface of the outer casing 31 is omitted in Figure 3.

[0036] The sound-absorbing material 32 is made from a material that has the function of attenuating sound, processed into a sheet shape with dimensions that match the inner dimensions of the outer casing 31. The material of the sound-absorbing material 32 may be, for example, glass wool, urethane sponge, or rock wool. Since the sound-absorbing material 32 may get wet from water splashing from the filler material 13, or from natural phenomena such as rain, snow, or fog, it is preferable that it be water-repellent. Therefore, it is preferable that the sound-absorbing material 32 includes a material that has been treated with a water-repellent coating, and it is more preferable that it includes water-repellent glass wool. The sound-absorbing material 22 of the base material 2 and the sound-absorbing material 32 of the sound-insulating member 3 may be the same material or different materials.

[0037] The support member 4 is a member that supports the far end of each base material 2 and the base end of each soundproofing member 3. The support member 4 can be constructed using a structural material such as metal or resin alone, or in combination as appropriate. The support member 4 has a support shaft 41 that pivotally supports the soundproofing member 3, a bolt 42 (an example of a fastener) that fixes the position of the soundproofing member 3, and a through hole 43 through which the bolt 42 is inserted (Figures 6 to 9). Multiple through holes 43 are provided around the support shaft 41 in an arc shape (four for each soundproofing member 3 in this embodiment), and the position of the bolt 42 can be selected from multiple positions.

[0038] The soundproofing member 3 is pivotally supported by a support shaft 41 fixed to the support member 4, which is inserted through a through hole 33, and can rotate around the support shaft 41. This allows the angle θ that the soundproofing member 3 makes with the base material 2 to be changed. In addition, the position of the soundproofing member 3 can be fixed by inserting a bolt 42 through one of the multiple through holes 43 and a through hole 34 in the soundproofing member 3. As the through hole 43 used is changed, the angle θ that the fixed position of the soundproofing member 3 makes with the base material 2 is changed. In other words, the angle θ can be selected by selecting the through hole 43.

[0039] In the cooling tower 10, noise is generated from the operation of the blower 11 (motor noise, wind noise, vibration noise, etc.) and from the sound of the water to be cooled flowing down the packing material 13. The louvers 1 are components that play a role in reducing noise caused by these sounds. The louvers 1 reduce noise by preventing sound diffusion at the air intake 16, which is the main path through which sound generated in the cooling tower 10 diffuses to the outside. Since the sound that leaves the air intake 16 travels through the space S between the base materials 2, placing the soundproofing member 3 on the extension of the space S makes it easier to prevent sound diffusion. When the angle θ is relatively small, most of the sound path is blocked by the soundproofing member 3, resulting in high soundproofing performance.

[0040] On the other hand, the space S that serves as the path for sound exiting the air intake 16 is also the path for air taken in through the air intake 16. Air intake is essential for the cooling tower 10 to function. The soundproofing member 3, positioned on the extension of space S, prevents sound diffusion while simultaneously hindering air intake, which may lead to an increase in the energy consumption of the cooling tower 10. When the angle θ is relatively large, the degree to which the air path is obstructed by the soundproofing member 3 is small, so the energy consumption of the cooling tower 10 is unlikely to increase.

[0041] In other words, if sound insulation performance is prioritized, the angle θ should be made smaller, and if energy consumption reduction is prioritized, the angle θ should be made larger. In this embodiment, the four through holes 43 correspond to angles θ of 60° (Figure 6), 90° (Figure 7), 120° (Figure 8), and 150° (Figure 9), respectively, and the effect that the louvers 1 have on the sound insulation performance and energy consumption of the cooling tower 10 can be selected from four levels. In this way, by selecting the through holes 43 used to fix the position of the sound insulation member 3, the degree of sound insulation performance and energy consumption of the cooling tower 10 can be easily and reproducibly adjusted. As in this example, it is preferable that the sound insulation member 3 is provided so that the angle θ it makes with the base material 2 is between 60° and 150°.

[0042] In this embodiment, the length L2 of the soundproofing member 3 extending from the far end of the base material 2 is 35 cm. This is approximately 115% of the separation distance L1 of the base material 2. When the angle θ is 90° (Figure 7), the soundproofing member 3 faces directly into the path of sound emitted from the air intake 16 at the far end of the space S. Therefore, because the length L2 of the soundproofing member 3 is approximately 115% of the separation distance L1 of the base material 2, the soundproofing member 3 blocks almost the entire path of sound, thus improving soundproofing performance. As in this example, it is preferable that the length L2 of the soundproofing member 3 extending from the far end of the base material 2 is between 80% and 120% of the separation distance L1 of the base material 2, as this makes it easier to achieve high soundproofing performance when determining the orientation of the louver 1 with soundproofing performance in mind.

[0043] In the above, the preferred range for the length L2 of the sound-insulating member 3 was examined based on the orientation when the angle θ is 90° (Figure 7), but other orientations may also be used as a reference. For example, when examining the orientation when the angle θ is 60° (Figure 6), the preferred range for the length L2 of the sound-insulating member 3 can be examined as a ratio to the separation distance L3 at the far end of the base material 2. In this case, it is preferable that the length L2 of the sound-insulating member 3 extending from the far end of the base material 2 is 50% or more and 100% or less of the separation distance L3 at the far end of the base material 2.

[0044] [Examples] To evaluate the degree of change in sound insulation performance and energy consumption due to changes in angle θ, noise measurement and pressure loss measurement tests were conducted. In the tests, test apparatus 20 (Figure 10) was used for noise measurement and test apparatus 30 (Figure 11) was used for pressure loss measurement. In the following description and in Figures 10 and 11, components similar to those in the cooling tower 10 are indicated by the same reference numerals as in Figures 1 to 9.

[0045] (1) Noise measurement Figure 10 shows the test apparatus 20 used for noise measurement. The test apparatus 20 is a simplified version of the cooling tower 10, with the blower 11 and eliminator 14 omitted. It evaluates the sound insulation performance of the louvers 1 by measuring only the noise caused by water sprayed from the water spraying device 12.

[0046] With the sound-absorbing material 22 and the entire sound-insulating member 3 of the base material 2 removed from the test apparatus 20, the water spraying device 12 was operated, and the noise (in dB) was measured at measurement points P1 and P2, which were set vertically 1 m horizontally away from the far end of the lower end of the three base materials 2, and the average value was used as the reference value. In this state, the base material 2 can be considered to have substantially no sound-insulating performance. Next, with the sound-absorbing material 22 and sound-insulating member 3 of the base material 2 attached (as shown in Figure 10), the noise was measured in the same manner as when measuring the reference value for each of the angles θ between the base material 2 and the sound-insulating member 3 being 60°, 90°, 120°, and 150°, and the average value of the measured values ​​at measurement points P1 and P2 was recorded. For each angle θ, the amount of decrease from the reference value of the recorded average value was recorded as the noise reduction value.

[0047] (2) Pressure loss measurement Figure 11 shows the test apparatus 30 used for pressure loss measurement. The test apparatus 30 is a simplified version of the cooling tower 10, with the water spraying device 12, packing material 13, and eliminator 14 omitted. In this setup, the only component that could potentially cause pressure loss is the louver 1.

[0048] Pitot tubes were installed at measurement points M1 to M4 on the outlet side (opposite the intake port 16) of the packing material 13, and the blower 11 was operated to measure the pressure drop at each measurement point. The obtained measurements in Pa were converted to values ​​in mmAq, and then converted to the pressure drop value at the standard wind speed of 2.032 m / s. The average value of the converted values ​​from the four measurement points M1 to M4 was recorded as the pressure drop value. The above measurements were performed for cases where the angle θ between the base material 2 and the soundproofing member 3 was 60°, 90°, 120°, and 150°.

[0049] (3) Test results Table 1 shows the noise reduction and pressure loss values ​​for each angle θ. It was shown that a smaller angle θ resulted in greater noise reduction and higher sound insulation performance. Furthermore, it was shown that a larger angle θ resulted in smaller pressure loss and reduced energy consumption.

[0050] Table 1: Noise measurement and pressure loss measurement [Table 1]

[0051] [Other Embodiments] Finally, other embodiments of the louvers and cooling towers according to the present invention will be described. Note that the configurations disclosed in each of the following embodiments can be applied in combination with configurations disclosed in other embodiments, as long as this does not create a contradiction.

[0052] In the above embodiment, a configuration in which the base material 2 has a sound-absorbing material 22 was described as an example. However, in the present invention, the presence or absence of a sound-absorbing material in the base material is optional. However, it is preferable if the base material has a sound-absorbing material, as this tends to improve the sound insulation performance of the louvers.

[0053] In the above embodiment, a configuration in which the soundproofing member 3 has a sound-absorbing material 32 was described as an example. However, in the present invention, the configuration for the soundproofing member to exhibit soundproofing performance is not limited to a configuration having a sound-absorbing material. For example, a soundproofing member having a sound-insulating material may be used instead of, or in addition to, a sound-absorbing material. Furthermore, the soundproofing member does not necessarily have to include components that are generally sold or used as sound-absorbing materials or sound-insulating materials. For example, if the soundproofing member itself has sufficient thickness, the soundproofing member will have soundproofing performance even if the material constituting the soundproofing member itself does not have special soundproofing performance.

[0054] In the above embodiment, a configuration was described as one in which a support member 4 is provided to support the far end of the base material 2 and the base end of the sound-insulating member 3. However, in the present invention, the presence or absence of a support member is optional. For example, the sound-insulating member may be directly attached to the far end of the base material.

[0055] In the above embodiment, a configuration in which the soundproofing member 3 is pivotally supported on a support shaft 41 was described as an example. However, in the present invention, the manner in which the soundproofing member is supported is arbitrary as long as the angle it makes with the base material can be changed. Furthermore, if the present invention comprises multiple sets of base material and soundproofing member, the angle made between the base material and the soundproofing member in each set may be determined independently, and can be any combination, such as all being the same, some being the same, or all being different. For example, in an installation situation where a soundproof wall lower than the cooling tower is provided near the cooling tower, the degree of noise prevention requirement may be less at the lower part of the cooling tower than at the upper part. In this case, it is preferable to make the angle that the soundproofing member makes with the base material smaller at the upper part of the cooling tower and larger at the lower part. As another example, in an installation situation where air intakes are provided in multiple directions of the cooling tower, the degree of noise prevention requirement may be greater at the air intake facing out of the site than at the other air intakes. In this case, it is preferable to make the angle that the soundproofing member makes with the base material smaller at the air intake facing out of the site and larger at the air intake facing the other direction.

[0056] In the above embodiment, a configuration was described as one in which the angle θ can be selected by selecting the through-holes 43 used to fix the position of the soundproofing member 3. However, in the present invention, the specific components that enable the angle between the base material and the soundproofing member to be changed are arbitrary. For example, in the above embodiment, if an arc-shaped elongated hole is provided instead of multiple through-holes 43, the angle θ can be changed steplessly within the dimensional range of the elongated hole.

[0057] In the above embodiment, a configuration in which the present invention is applied to a cooling tower 10, which is a cross-flow type cooling tower, was described as an example. However, the cooling tower to which the present invention is applied is not limited to a cross-flow type cooling tower. For example, the present invention can also be applied to a counter-flow type cooling tower.

[0058] With regard to other configurations, the embodiments disclosed herein are illustrative in all respects, and it should be understood that the scope of the present invention is not limited thereto. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the invention. Therefore, other embodiments modified without departing from the spirit of the invention are naturally included within the scope of the present invention. [Industrial applicability]

[0059] This invention can be used for cooling industrial water, air conditioning water, and the like. [Explanation of Symbols]

[0060] 1: Louver 2: Base material 21: Exterior 22: Sound-absorbing material 3: Soundproofing materials 31: Exterior 32: Sound-absorbing material 33: Through hole 34: Through hole 4: Support member 41: Support shaft 42: Bolt 43: Through hole 10: Cooling tower 11: Blower 12: Sprinkler system 13: Filling material 14: Eliminator 15: Cabinet 16: Air intake 20: Test equipment B: Basic

Claims

1. A louver that is attached to the air intake of a cooling tower, A base material whose base end is attached to the air intake port, A louver comprising a sound-insulating member provided on the far end side of the base material so as to be able to change the angle it makes with the base material.

2. The louver according to claim 1, wherein the base material is a sound-absorbing material.

3. The base material further comprises a support member that supports the sound-insulating member at its far end, The louver according to claim 1, wherein the support member has a fixing device for fixing the posture of the soundproofing member, and the position of the fixing device can be selected from a plurality of positions.

4. The louver according to claim 1, wherein the soundproofing member includes water-repellent glass wool.

5. The system comprises multiple sets of the base material and the soundproofing member. The louver according to claim 1, wherein the length of at least one set of soundproofing members extending from the far end side of the base material of the set is 80% or more and 120% or less of the distance between the base material and the base material of another set provided below the set.

6. The louver according to any one of claims 1 to 5, wherein the soundproofing member is provided so that the angle it makes with the base material is 60° or more and 150° or less.

7. A cooling tower equipped with louvers at the air intake, The aforementioned louvers A base material whose base end is attached to the air intake port, The system includes a soundproofing member provided on the far end side of the base material, which is capable of changing the angle it makes with the base material. cooling tower.

Images