A noise reduction design device for cooling tower wind pipe

Abstract

The utility model belongs to the cooling tower technical field especially is a kind of cooling tower wind pipe's noise reduction design device, including cylinder, the outer wall of cylinder is fixedly connected with fixed plate, the upper surface of fixed plate is equipped with the first clamping groove, the inner wall of first clamping groove is clamped with the first buckle, the upper surface of first buckle is fixedly connected with the shell, the shell is slidably connected in the outer wall of cylinder, the upper surface of shell is equipped with mounting groove, the inner wall of shell is equipped with sound absorption hole, the inner wall of mounting groove is placed with first sound insulation layer.

Description

Technical Field

[0001] This utility model relates to the field of cooling tower technology, specifically to a noise reduction design device for a cooling tower duct. Background Technology

[0002] Cooling towers are key equipment in HVAC systems, mainly used to remove waste heat generated during the operation of chilled water units. Their working principle is based on the heat exchange process between water and air, reducing the temperature of circulating cooling water through evaporation. Among them, a noise reduction design device for cooling tower ducts refers to a special noise reduction structure developed for the airflow noise characteristics of cooling tower ducts.

[0003] Traditional cooling tower duct noise reduction devices are mostly connected to the duct body by welding or bolting, which requires complete disassembly for maintenance. Replacing sound insulation materials or overhauling the internal structure presents problems of complex operations and long downtime. For example, hospital cooling towers require continuous operation, and traditional structures cannot perform partial repairs, forcing the use of temporary noise reduction measures, resulting in a periodic decline in noise control effectiveness. Existing noise reduction structures are usually single-layer sound-absorbing designs, with sound-absorbing materials directly attached to the inner wall of the duct, lacking a multi-stage sound wave attenuation mechanism. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a noise reduction design device for cooling tower ducts. It solves the problem that current noise reduction devices for cooling tower ducts are mostly connected to the duct body by welding or bolting, which requires complete disassembly during maintenance and results in complex operations and long downtime when replacing sound insulation materials or repairing the internal structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a noise reduction design device for a cooling tower duct, comprising a duct body, a fixing plate fixedly connected to the outer wall of the duct body, a first slot formed on the upper surface of the fixing plate, a first buckle engaged on the inner wall of the first slot, a housing fixedly connected to the upper surface of the first buckle, the housing slidably connected to the outer wall of the duct body, an installation groove formed on the upper surface of the housing, sound-absorbing holes formed on the inner wall of the housing, and a first sound insulation layer placed on the inner wall of the installation groove.

[0006] As a preferred embodiment of this utility model, a connecting plate is fixedly connected to the outer wall of the shell, and a connecting hole is provided on the upper surface of the connecting plate.

[0007] As a preferred embodiment of this utility model, a connecting column is slidably connected to the inner wall of the connecting hole, and a top plate is fixedly connected to the upper surface of the connecting column.

[0008] As a preferred technical solution of this utility model, a screw hole is provided on the upper surface of the top plate, and a screw is threaded into the inner wall of the screw hole. The screw hole extends through the connecting post into the interior of the connecting plate.

[0009] As a preferred embodiment of this utility model, a second slot is provided on the upper surface of the top plate, a second buckle is engaged with the inner wall of the second slot, a fixing frame is fixedly connected to the upper surface of the second buckle, a second sound insulation layer is fixedly connected to the lower surface of the fixing frame, and the second sound insulation layer is slidably connected to the inner wall of the cylinder.

[0010] As a preferred embodiment of this utility model, the material of the first sound insulation layer is polyester fiber sound-absorbing cotton.

[0011] As a preferred embodiment of this utility model, the material of the second sound insulation layer is a rubber sound insulation pad.

[0012] Compared with the prior art, this utility model provides a noise reduction design device for cooling tower ducts, which has the following beneficial effects:

[0013] 1. This noise reduction design device for a cooling tower duct utilizes a fixed plate and slot structure on the outer wall, along with snap-fit ​​fasteners, to achieve a sliding connection of the shell, forming a detachable noise reduction component. This design overcomes the limitations of traditional fixed noise reduction structures. Sound-absorbing holes and mounting slots on the inner wall of the shell form a multi-stage sound wave attenuation channel. After entering the sound-absorbing holes, sound waves are reflected multiple times by the honeycomb-shaped hole walls, gradually dissipating energy. The sound insulation layer filled in the mounting slot further blocks the straight-line propagation path of mid-to-high frequency noise. Combined with the sliding connection characteristics of the shell and cylinder, the sound insulation material can be replaced without disassembling the overall structure. The sliding connection method simultaneously reduces vibration transmission between the shell and cylinder, reducing structural noise generation through mechanical decoupling. The sound-absorbing holes cover the shell surface with a non-uniform density distribution, creating a gradient sound absorption effect for different frequency bands. Local high-density areas effectively suppress peak noise in specific frequency bands.

[0014] 2. This noise reduction design device for a cooling tower duct utilizes a connecting plate and connecting hole design to form an axial sliding guide structure. As the connecting column slides along the connecting hole, a self-centering effect is generated, ensuring reduced perpendicularity error between the top plate and the shell, thus improving assembly accuracy. The threaded hole extends through the connecting column into the connecting plate, and the threaded fastening method creates an adjustable rigid connection between the top plate and the shell. When subjected to fan vibration loads, the threaded engagement surface absorbs energy through plastic deformation, reducing vibration transmission rate. The embedded connection of the second slot and the second buckle enables quick assembly and disassembly of the fixing frame and the top plate. Combined with the sliding connection characteristics of the second sound insulation layer on the inner wall of the duct, the entire sound insulation component can be replaced quickly, improving efficiency compared to traditional bolt fixing methods. The combined application of polyester fiber sound-absorbing cotton and rubber sound-insulating pads forms a broadband sound absorption system. The polyester fiber achieves a sound absorption coefficient of 20dB / m for mid-to-high frequency noise (500-4000Hz), while the rubber pad provides 15dB / m sound insulation for low-frequency noise (63-500Hz). The synergistic effect of the two increases the overall noise reduction by 18dB. The sliding connection structure simultaneously eliminates hard contact points between the shell and the cylinder, preventing structural noise from radiating through the contact surface. Attached Figure Description

[0015] Figure 1 This is a front view of the structure of this utility model;

[0016] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0017] Figure 3 This is an exploded view of the structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the shell structure of this utility model.

[0019] In the diagram: 1. Cylinder; 2. Fixing plate; 3. First slot; 4. First buckle; 5. Shell; 6. Mounting slot; 7. Sound absorption hole; 8. First sound insulation layer; 9. Connecting plate; 10. Connecting hole; 11. Connecting column; 12. Connecting block; 13. Top plate; 14. Screw hole; 15. Screw; 16. Second slot; 17. Second buckle; 18. Fixing bracket; 19. Second sound insulation layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1

[0022] Please see Figure 1-4 In this embodiment: a noise reduction design device for a cooling tower duct includes a duct body 1, a fixing plate 2 fixedly connected to the outer wall of the duct body 1, a first slot 3 formed on the upper surface of the fixing plate 2, a first buckle 4 engaged on the inner wall of the first slot 3, a housing 5 fixedly connected to the upper surface of the first buckle 4, the housing 5 slidably connected to the outer wall of the duct body 1, an installation groove 6 formed on the upper surface of the housing 5, sound-absorbing holes 7 formed on the inner wall of the housing 5, and a first sound insulation layer 8 placed on the inner wall of the installation groove 6.

[0023] In this embodiment, a detachable noise reduction component is formed by setting a fixing plate 2 and a slot structure on the outer wall, and using a buckle to achieve a sliding connection of the shell 5. This design breaks through the limitations of traditional fixed noise reduction structures. The sound-absorbing holes 7 and the mounting groove 6 on the inner wall of the shell 5 form a multi-level sound wave attenuation channel. After the sound waves enter the sound-absorbing holes 7, they are reflected multiple times by the honeycomb hole walls, and the energy is gradually consumed. The sound insulation layer filled in the mounting groove 6 further blocks the straight propagation path of mid-to-high frequency noise. Combined with the sliding connection characteristics of the shell 5 and the cylinder 1, the sound insulation material can be replaced without disassembling the overall structure. The sliding connection method simultaneously reduces the vibration transmission between the shell 5 and the cylinder 1, and reduces the generation of structural noise through mechanical decoupling. The sound-absorbing holes 7 cover the surface of the shell 5 with a non-uniform density distribution, forming a gradient sound absorption effect for different frequency bands of noise. The local high-density areas effectively suppress the peak noise of specific frequency bands.

[0024] Preferably, a connecting plate 9 is fixedly connected to the outer wall of the housing 5, and a connecting hole 10 is provided on the upper surface of the connecting plate 9.

[0025] The axial sliding guide structure is formed by the cooperation design of the connecting plate 9 and the connecting hole 10. When the connecting column 11 slides along the connecting hole 10, it generates a self-centering effect, which ensures that the perpendicularity error between the top plate 13 and the shell 5 is reduced and the assembly accuracy is improved.

[0026] Preferably, a connecting post 11 is slidably connected to the inner wall of the connecting hole 10, a top plate 13 is fixedly connected to the upper surface of the connecting post 11, a screw hole 14 is provided on the upper surface of the top plate 13, a screw 15 is threadedly connected to the inner wall of the screw hole 14, and the screw hole 14 penetrates the connecting post 11 and extends into the interior of the connecting plate 9.

[0027] The screw hole 14 extends through the connecting column 11 into the interior of the connecting plate 9. The threaded fastening method enables the top plate 13 and the shell 5 to form an adjustable rigid connection. When subjected to the vibration load of the fan, the threaded engagement surface absorbs energy through plastic deformation, reducing the vibration transmission rate.

[0028] Furthermore, a second slot 16 is provided on the upper surface of the top plate 13, a second buckle 17 is engaged with the inner wall of the second slot 16, a fixing frame 18 is fixedly connected to the upper surface of the second buckle 17, a second sound insulation layer 19 is fixedly connected to the lower surface of the fixing frame 18, and the second sound insulation layer 19 is slidably connected to the inner wall of the cylinder 1.

[0029] The embedded connection between the second slot 16 and the second buckle 17 enables quick assembly and disassembly of the fixing frame 18 and the top plate 13. Combined with the sliding connection of the second sound insulation layer 19 on the inner wall of the cylinder 1, the entire sound insulation component can be replaced quickly, which is more efficient than the traditional bolt fixing method.

[0030] Preferably, the material of the first sound insulation layer 8 is polyester fiber sound-absorbing cotton.

[0031] The combination of polyester fiber sound-absorbing cotton and rubber sound insulation pads forms a broadband sound absorption system, with polyester fiber achieving a sound absorption coefficient of 20dB / m for mid-to-high frequency noise in the 500-4000Hz range.

[0032] Furthermore, the material of the second sound insulation layer 19 is a rubber sound insulation pad.

[0033] The rubber pad provides 15dB / m of sound insulation against low-frequency noise in the 63-500Hz range, and the combined effect of the two components increases the overall noise reduction by 18dB.

[0034] The working principle and usage process of this utility model are as follows: The working principle utilizes a split structure to achieve multi-path attenuation of sound waves. The shell 5 and the cylinder 1 are connected by a sliding snap-fit ​​mechanism to form a non-rigid connection, eliminating vibration transmission paths. The precise fit between the connecting column 11 and the connecting hole 10 ensures the axial positioning accuracy of the components, and the threaded fastening generates pre-tightening force to maintain structural stability. The array of sound-absorbing holes 7 forms a Helmholtz resonant cavity, generating an impedance matching effect for specific frequency bands of sound waves. Polyester fiber sound-absorbing cotton dissipates mid-to-high frequency sound energy through friction in a porous medium, and the rubber sound insulation pad suppresses low-frequency vibration noise due to its high damping characteristics. The sliding contact between the second sound insulation layer 19 and the inner wall of the cylinder 1 constitutes a double-layer sound barrier, which, combined with the snap-fit ​​embedded connection, forms an expandable noise reduction unit, achieving gradient attenuation of broadband noise.

[0035] Usage Procedure, Installation Stage: Slide the housing 5 into the slot of the fixing plate 2. The first buckle 4 engages with the slot to complete the initial positioning. After inserting the connecting post 11 into the connecting hole 10, rotate the screw 15 to fix the top plate 13. Adjust the thread engagement depth and preload to 20-30 N·m. Maintenance Stage: Remove the second buckle 17 to release the fixing bracket 18. Slide the second sound insulation layer 19 along the inner wall of the cylinder 1 to remove it. Loosen the screw 15 to release the constraint of the top plate 13. Axially pull out the connecting post 11 to replace the housing 5 component. Upgrade Stage: Add an additional noise reduction unit to the second slot 16. Adjust the low-frequency noise reduction performance by stacking rubber sound insulation pads of different thicknesses. In daily operation, the modular structure allows maintenance of one side of the component without affecting the overall operation. All disassembly and assembly processes do not require special tools, and a single person can complete the replacement of the entire set of components within 15 minutes.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A noise reduction design device for a cooling tower duct, comprising a duct body (1), characterized in that: A fixing plate (2) is fixedly connected to the outer wall of the cylinder (1). A first slot (3) is provided on the upper surface of the fixing plate (2). A first buckle (4) is engaged on the inner wall of the first slot (3). A housing (5) is fixedly connected to the upper surface of the first buckle (4). The housing (5) is slidably connected to the outer wall of the cylinder (1). An installation groove (6) is provided on the upper surface of the housing (5). A sound-absorbing hole (7) is provided on the inner wall of the housing (5). A first sound insulation layer (8) is placed on the inner wall of the installation groove (6).

2. The noise reduction design device for a cooling tower duct according to claim 1, characterized in that: A connecting plate (9) is fixedly connected to the outer wall of the housing (5), and a connecting hole (10) is provided on the upper surface of the connecting plate (9).

3. The noise reduction design device for a cooling tower duct according to claim 2, characterized in that: The inner wall of the connecting hole (10) is slidably connected to a connecting column (11), and a top plate (13) is fixedly connected to the upper surface of the connecting column (11).

4. The noise reduction design device for a cooling tower duct according to claim 3, characterized in that: The top plate (13) has a screw hole (14) on its upper surface. The screw hole (14) is threaded with a screw (15) on its inner wall. The screw hole (14) extends through the connecting post (11) into the interior of the connecting plate (9).

5. The noise reduction design device for a cooling tower duct according to claim 3, characterized in that: The top plate (13) has a second slot (16) on its upper surface. The inner wall of the second slot (16) is fitted with a second buckle (17). The upper surface of the second buckle (17) is fixedly connected to a fixing frame (18). The lower surface of the fixing frame (18) is fixedly connected to a second sound insulation layer (19). The second sound insulation layer (19) is slidably connected to the inner wall of the cylinder (1).

6. The noise reduction design device for a cooling tower duct according to claim 1, characterized in that: The material of the first sound insulation layer (8) is polyester fiber sound-absorbing cotton.

7. The noise reduction design device for a cooling tower duct according to claim 5, characterized in that: The material of the second sound insulation layer (19) is a rubber sound insulation pad.

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