Labyrinth type silencer

Abstract

The invention discloses a labyrinth type silencer, relates to the technical field of acoustics, and solves the problems that a traditional silencer is large in airflow resistance, and ventilation and heat dissipation of equipment are affected. The labyrinth type silencer comprises a silencing pipeline and a labyrinth type silencer body, the silencing pipeline comprises an upper end silencing sheet assembly, a middle silencing sheet assembly, a lower end silencing sheet assembly, a left silencer frame and a right silencer frame, and the upper end silencing sheet assembly, the middle silencing sheet assembly and the lower end silencing sheet assembly are fixed between the left silencer frame and the right silencer frame; silencing channels are respectively formed between the upper end silencing sheet assembly and the middle silencing sheet assembly and between the lower end silencing sheet assembly and the middle silencing sheet assembly; and digesting. The silencing channel in the labyrinth type silencer extends in a winding mode, a structure similar to a labyrinth is formed, and under the condition that the size of the labyrinth type silencer is the same as that of a similar silencer, a larger and longer flow channel is provided for silencing.

Description

Technical Field

[0001] The present invention relates to the field of acoustic technology, in particular to a labyrinth muffler. Background Art

[0002] With the acceleration of industrialization and the development of urbanization, noise pollution has become a significant factor affecting people's quality of life and working environment. Especially in industrial production, data centers, communication base stations, and other places, the noise generated by equipment operation not only affects the health of workers but also the surrounding environment. Equipment cabinet air outlets typically produce high air speeds and complex noise, making effective noise control particularly important. To reduce noise at equipment cabinet air outlets, traditional silencer technology is widely used.

[0003] While some existing muffler technologies offer good noise reduction, they are often complex, bulky, and heavy. This not only increases manufacturing costs but also limits their application in space-constrained environments, hindering installation in equipment cabinets. Furthermore, while reducing noise, traditional mufflers often increase airflow resistance, reducing ventilation efficiency and impacting proper operation and heat dissipation. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems. A labyrinth muffler is designed to solve the problem that the traditional muffler has large air flow resistance and affects the ventilation and heat dissipation of the equipment.

[0005] The technical solution of the present invention to achieve the above-mentioned purpose is a labyrinth muffler comprising: A muffler duct, wherein one side of the muffler duct has an air inlet for docking with the air outlet of the equipment cabinet, and the other side has at least one air outlet, and at least one muffler channel is formed between the air inlet and the air outlet; The muffler pipe includes an upper muffler plate assembly, a middle muffler plate assembly, a lower muffler plate assembly, a left muffler frame and a right muffler frame, wherein the upper muffler plate assembly, the middle muffler plate assembly and the lower muffler plate assembly are fixed between the left muffler frame and the right muffler frame; The upper end muffler assembly and the lower end muffler assembly are respectively located above and below the middle muffler assembly, and muffler channels are formed between the upper end muffler assembly and the lower end muffler assembly and the middle muffler assembly; The upper end sound-absorbing sheet assembly, the middle end sound-absorbing sheet assembly and the lower end sound-absorbing sheet assembly have the same structure, including a sound-absorbing sheet frame, a perforated plate and a porous sound-absorbing material. The porous sound-absorbing material is filled in the cavity formed between the frame and the perforated plate. The perforated plate forms the inner wall of the sound-absorbing channel and has a plurality of small holes on the perforated plate.

[0006] Furthermore, the two silencer channels are connected in parallel, and the silencer channels extend in a wave shape.

[0007] Furthermore, there are two air outlets, and the air outlet ends of the two silencer channels are respectively connected to the two air outlets.

[0008] Furthermore, the upper end sound-absorbing plate assembly includes an upper end sound-absorbing plate frame, a porous sound-absorbing material and an upper end sound-absorbing plate perforated plate, and the porous sound-absorbing material is filled in the cavity formed between the upper end sound-absorbing plate frame and the upper end sound-absorbing plate perforated plate.

[0009] Furthermore, the intermediate sound-absorbing plate assembly includes an intermediate sound-absorbing plate frame, a porous sound-absorbing material and an intermediate sound-absorbing plate perforated plate, and the porous sound-absorbing material is filled in a cavity formed between the intermediate sound-absorbing plate frame and the intermediate sound-absorbing plate perforated plate.

[0010] Furthermore, the lower end sound-absorbing plate assembly includes a lower end sound-absorbing plate frame, a porous sound-absorbing material and a lower end sound-absorbing plate perforated plate, and the porous sound-absorbing material is filled in the cavity formed between the lower end sound-absorbing plate frame and the lower end sound-absorbing plate perforated plate.

[0011] Furthermore, a guide portion is formed on a protrusion on one side of the perforated plate of the middle sound-absorbing plate close to the air inlet, and both upper and lower sides of the guide portion are arc surfaces.

[0012] Furthermore, a rubber sealing ring is provided on the periphery of the air inlet.

[0013] Furthermore, a dustproof net is provided at the air outlet.

[0014] Compared with the prior art, the beneficial effects are: The air inlet of the muffler of the present invention is connected to the air outlet of the equipment cabinet. The air discharged when the equipment cabinet dissipates heat enters the muffler channel from the air inlet. The noise generated during exhaust also enters the muffler channel. The noise enters the cavity formed between the frame and the perforated plate through the small holes on the perforated plate, and the sound absorption effect is improved through cavity resonance. At the same time, the viscosity and internal friction of the porous sound-absorbing material increase the sound energy attenuation loss, improve the sound absorption and noise reduction effect, and reduce the noise without affecting the air output of the equipment cabinet. Finally, the air is discharged from the air outlet. The muffler channel in the muffler is winding and extended, forming a structure similar to a maze. With the same volume as similar mufflers, it has a larger and longer flow channel for muffler.

[0015] The labyrinth muffler structure design and the application of lightweight materials reduce the weight of the muffler. The combination of perforated plates and porous sound-absorbing materials achieves mid- and high-frequency sound absorption effects, making the muffler occupy a small space, greatly reducing the weight of the muffler, and reducing the difficulty of installation and transportation. At the same time, it is easy to install at the air outlet of the equipment cabinet, reducing the burden on the equipment cabinet, and easy to disassemble and replace structural components without affecting the normal operation and maintenance of the equipment, thereby improving the stability and durability of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the labyrinth muffler of the present invention; Figure 2 This is a schematic diagram of the structure of the labyrinth muffler from another perspective; Figure 3 It is a schematic diagram of the cross-sectional structure of a labyrinth muffler; Figure 4 It is a schematic diagram of the gas flow in the labyrinth muffler; Figure 5 The transmission loss of the labyrinth muffler in the frequency range of 125Hz~1600Hz is expressed as a bar graph in the form of 1 / 3 octave bands.

[0017] In the figure, 1. upper end silencer plate assembly; 11. upper end silencer plate frame; 12. upper end silencer plate perforated plate; 13. porous sound-absorbing material; 2. middle silencer plate assembly; 21. middle silencer plate frame; 22. middle silencer plate perforated plate; 221. air guide; 3. lower end silencer plate assembly; 31. lower end silencer plate frame; 32. lower end silencer plate perforated plate; 4. left silencer frame; 5. right silencer frame; 6. rubber sealing ring; 7. dustproof net; 101. air inlet; 102. air outlet; 103. silencer channel. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] An embodiment of the present invention provides a new type of equipment cabinet air outlet silencer, specifically a labyrinth silencer, which achieves the characteristics of low airflow resistance and lightweight while ensuring excellent sound insulation effect by optimizing structural design and material selection. It not only improves the portability and installation convenience of the equipment, but also helps to reduce production and operating costs, and meet the higher requirements of modern industry for equipment performance and space utilization.

[0020] refer to Figure 1-Figure 3The silencer structure mainly includes a silencer pipe, which mainly includes modules such as an upper silencer plate assembly 1, a middle silencer plate assembly 2, a lower silencer plate assembly 3, a left silencer frame 4, and a right silencer frame 5. The upper silencer plate assembly 1, the middle silencer plate assembly 2, and the lower silencer plate assembly 3 are arranged in sequence from top to bottom and fixedly installed between the left silencer frame 4 and the right silencer frame 5. The silencer pipe is used to provide a silencer channel 103, which effectively reduces the noise in the system through the attenuation of sound wave propagation and reflection and diffraction.

[0021] The left and right sides of the upper muffler plate assembly 1, the middle muffler plate assembly 2, and the lower muffler plate assembly 3 are respectively fixedly connected to the left muffler frame 4 and the right muffler frame 5. Two parallel muffler channels 103 are formed between the upper muffler plate assembly 1 and the middle muffler plate assembly 2, and between the lower muffler plate assembly 3 and the middle muffler plate assembly 2.

[0022] The muffler duct has an air inlet 101 on one side and an air outlet 102 on the other. In this embodiment, two muffler ducts 103 share a common air inlet 101, which interfaces with the air outlet of the equipment cabinet. The muffler can be docked and secured to the air outlet of the equipment cabinet via auxiliary structures. The two air outlets 102 communicate with the outlet ends of the two muffler ducts 103, respectively.

[0023] The structures of the upper end muffler plate assembly 1, the middle end muffler plate assembly 2 and the lower end muffler plate assembly 3 are basically the same, but the shapes are different.

[0024] The upper muffler assembly 1 primarily consists of an upper muffler frame 11, a porous sound-absorbing material 13, and an upper muffler perforated plate 12. The upper muffler frame 11 forms the top surface of the muffler duct, while the upper muffler perforated plate 12 is positioned below the upper muffler frame 11. A cavity is formed between the upper muffler frame 11 and the upper muffler perforated plate 12, which is filled with the porous sound-absorbing material 13. The porous sound-absorbing material 13 has a large number of interconnected micropores from the surface to the inside. Through viscous loss and internal friction of air flowing through the porous sound-absorbing material 13, it increases sound energy attenuation and improves the sound absorption and noise reduction effect.

[0025] Similarly, the intermediate muffler assembly 2 is primarily composed of an intermediate muffler frame 21, porous sound-absorbing material 13, and an intermediate muffler perforated plate 22. The intermediate muffler frame 21 forms the side of the muffler duct, with the air outlet 102 located on this side. The intermediate muffler perforated plate 22 is fixedly connected to one side of the intermediate muffler frame 21. A cavity is formed between the intermediate muffler perforated plate 22 and the intermediate muffler frame 21, and the porous sound-absorbing material 13 is filled in this cavity.

[0026] The upper surfaces of the upper end sound-absorbing sheet perforated plate 12 and the middle sound-absorbing sheet perforated plate 22 constitute the inner wall of the sound-absorbing channel 103 located in the upper layer.

[0027] The lower end silencer assembly 3 is mainly composed of a lower end silencer frame 31, a porous sound-absorbing material 13 and a lower end silencer perforated plate 32. The lower end silencer frame 31 constitutes the bottom surface of the silencer pipe. The lower end silencer perforated plate 32 is located above the lower end silencer frame 31, and a cavity is formed between the lower end silencer frame 31 and the lower end silencer perforated plate 32. The porous sound-absorbing material 13 is filled in the cavity.

[0028] The lower surfaces of the lower end sound-absorbing sheet perforated plate 32 and the middle sound-absorbing sheet perforated plate 22 constitute the inner wall of the sound-absorbing channel 103 located at the lower layer.

[0029] The upper sound-absorbing plate frame 11 , the middle sound-absorbing plate frame 21 and the lower sound-absorbing plate frame 31 are made of sound-insulating materials to prevent sound from emanating from the cavity where the porous sound-absorbing material 13 is located.

[0030] refer to Figure 3 The two muffler channels 103 in the muffler pipe are wavy in shape, similar to a maze, to provide a sufficient muffler distance while reducing the size of the muffler. Therefore, the upper muffler perforated plate 12 and the lower muffler perforated plate 32 are bent into a wavy shape, and the upper and lower surfaces of the middle muffler perforated plate 22 are also bent into a wavy shape.

[0031] In this embodiment, a plurality of small holes (not shown) are provided on the upper sound-absorbing plate perforated plate 12, the middle sound-absorbing plate perforated plate 22, and the lower sound-absorbing plate perforated plate 32 to allow the sound-absorbing channel 103 to communicate with the cavity, thereby generating resonance with the cavity to enhance the sound absorption effect. This also facilitates the entry of noise into the porous sound-absorbing material 13.

[0032] like Figure 3 As shown, in order to guide the heat dissipation air from the air outlet of the equipment cabinet into the silencer channel 103, a guide portion 221 is formed on the side of the middle silencer perforated plate 22 close to the air inlet 101 and protrudes toward the air inlet 101. The guide portion 221 is smooth, and the upper and lower surfaces of the guide portion 221 are arc-shaped, constituting a part of the inner wall of the silencer channel 103. The guide portion 221 divides the air inlet 101 into two parts, guiding the heat dissipation air to enter the two silencer channels 103 respectively.

[0033] The guide design of the guide part 221 can effectively reduce the resistance of the airflow when entering the muffler, reduce the regeneration noise caused by the impact of the airflow, guide the airflow to be evenly distributed to various parts of the muffler, thereby optimizing the airflow distribution, ensuring that the sound-absorbing material can fully exert its sound absorption performance, and at the same time improve the aerodynamic performance and adapt to different airflow conditions.

[0034] In this embodiment, the upper, middle, and lower muffler fin assemblies 1, 2, and 3 are positioned independently of one another to facilitate machining of the frame and perforated plate. The left and right muffler frames 4 and 5 enclose the muffler passage 103. These frames are constructed of thicker sound-insulating material.

[0035] In other technical solutions, the left muffler frame 4 and the right muffler frame 5 may not be provided, and the left and right sides of the upper muffler plate assembly 1, the middle muffler plate assembly 2 and the lower muffler plate assembly 3 may be designed to be integrally connected to form a whole.

[0036] In other embodiments, the shape of the muffler channel 103 is not limited to a wavy shape, but may also be other winding shapes. The number of the intermediate muffler sheet assemblies 2 is not limited to two, but may also be three, four, etc. When the number of the intermediate muffler sheet assemblies 2 is greater than two, a muffler channel 103 may also be formed between the intermediate muffler sheet assemblies 2 to achieve a diversion effect.

[0037] like Figure 1 As shown, a rubber sealing ring 6 is provided at the air inlet 101 of the muffler. The rubber sealing ring 6 is located on the periphery of the air inlet 101 and is installed between the muffler and the equipment cabinet to form a circle of elastic connection. The rubber is bonded to the metal surface by utilizing the high bonding strength of the rubber. The rubber material has high damping and absorbs mechanical energy strongly, and prevents the generation of structural secondary noise through the damping and vibration reduction effect.

[0038] like Figure 2 As shown, a dust screen 7 is provided at each of the two air outlets 102 of the muffler to prevent external dust from entering the equipment cabinet.

[0039] refer to Figure 4 When the equipment cabinet dissipates heat, the exhaust air flows out of the air outlet and then enters the muffler channel 103 through the air inlet 101. The noise generated enters the muffler channel 103. Through cavity resonance, the viscosity and internal friction of the porous material increase the sound energy attenuation loss and reduce noise. This reduces the noise generated during exhaust while ensuring the original air output of the equipment.

[0040] An important parameter of a muffler is the transmission loss, which is defined as the ratio of the incident to the outgoing sound energy. The attenuation or transmission loss of sound energy, L (in dB), is defined as: Where: P in is the incident power at the entrance, P out is the output power at the outlet.

[0041] The acoustic performance of a muffler of the present invention was simulated by software. The specific structural parameters were as follows: the length along the sound wave propagation path was 1.4 m; the porous sound-absorbing material 13 was 24K sound-absorbing cotton; the perforated plate had a thickness of 0.5 mm, a pore diameter of 3 mm, and a porosity of 23%.

[0042] The muffler 3D model is modeled in COMSOL. The port boundary conditions are used to simulate the inlet and outlet of the muffler. The transmission loss in the frequency range of 125Hz~1600Hz is mainly output and expressed in the form of 1 / 3 octave bands, as shown in the figure below: Figure 5 As shown in the figure, the average transmission loss of the structure in the range of 125-1600Hz is 20dB. This means that the noise can be reduced by about 20dB through this muffler.

[0043] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Any changes that may be made to certain parts thereof by those skilled in the art all reflect the principles of the present invention and fall within the scope of protection of the present invention.

Claims

1. A labyrinth muffler, characterized in that: include: A muffler duct, wherein one side of the muffler duct has an air inlet (101) for docking with an air outlet of an equipment cabinet, and the other side is formed with at least one air outlet (102), and at least one muffler channel (103) is formed between the air inlet (101) and the air outlet (102); The muffler pipe comprises an upper muffler sheet assembly (1), a middle muffler sheet assembly (2), a lower muffler sheet assembly (3), a left muffler frame (4) and a right muffler frame (5); the upper muffler sheet assembly (1), the middle muffler sheet assembly (2) and the lower muffler sheet assembly (3) are fixed between the left muffler frame (4) and the right muffler frame (5); The upper end sound-absorbing sheet assembly (1) and the lower end sound-absorbing sheet assembly (3) are respectively located above and below the middle sound-absorbing sheet assembly (2), and sound-absorbing channels (103) are formed between the upper end sound-absorbing sheet assembly (1) and the lower end sound-absorbing sheet assembly (3) and the middle sound-absorbing sheet assembly (2); The upper end sound-absorbing sheet assembly (1), the middle end sound-absorbing sheet assembly (2) and the lower end sound-absorbing sheet assembly (3) have the same structure, comprising a sound-absorbing sheet frame, a perforated plate and a porous sound-absorbing material (13), wherein the porous sound-absorbing material (13) is filled in a cavity formed between the frame and the perforated plate, and the perforated plate forms the inner wall of the sound-absorbing channel (103), and the perforated plate has a plurality of small holes.

2. The labyrinth muffler according to claim 1, characterized in that The two muffler channels are connected in parallel, and the muffler channel (103) extends in a wave shape.

3. The labyrinth muffler according to claim 2, characterized in that: There are two air outlets (102), and the air outlet ends of the two silencer channels (103) are respectively connected to the two air outlets (102).

4. The labyrinth muffler according to claim 1, characterized in that The upper end sound-absorbing sheet assembly (1) comprises an upper end sound-absorbing sheet frame (11), a porous sound-absorbing material (13) and an upper end sound-absorbing sheet perforated plate (12), wherein the porous sound-absorbing material (13) is filled in a cavity formed between the upper end sound-absorbing sheet frame (11) and the upper end sound-absorbing sheet perforated plate (12).

5. The labyrinth muffler according to claim 1, characterized in that The intermediate sound-absorbing sheet assembly (2) comprises an intermediate sound-absorbing sheet frame (21), a porous sound-absorbing material (13) and an intermediate sound-absorbing sheet perforated plate (22), wherein the porous sound-absorbing material (13) is filled in a cavity formed between the intermediate sound-absorbing sheet frame (21) and the intermediate sound-absorbing sheet perforated plate (22).

6. The labyrinth muffler according to claim 1, characterized in that The lower end sound-absorbing sheet assembly (3) comprises a lower end sound-absorbing sheet frame (31), a porous sound-absorbing material (13) and a lower end sound-absorbing sheet perforated plate (32), wherein the porous sound-absorbing material (13) is filled in a cavity formed between the lower end sound-absorbing sheet frame (31) and the lower end sound-absorbing sheet perforated plate (32).

7. The labyrinth muffler according to claim 5, characterized in that A guide portion (221) is formed on one side of the middle sound-absorbing plate perforated plate (22) close to the air inlet (101), and both upper and lower sides of the guide portion (221) are arc surfaces.

8. The labyrinth muffler according to claim 1, characterized in that A rubber sealing ring (6) is provided on the periphery of the air inlet (101).

9. The labyrinth muffler according to claim 1, characterized in that A dustproof net (7) is provided at the air outlet (102).

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