Air inlet silencer

Abstract

The utility model relates to the technical field of silencers, in particular to an air inlet silencer, which realizes light and thin installation and use on the basis of solving the problems of large noise and large wind resistance at an air inlet of an equipment cabinet body in the prior art. The two sides of the silencer frame are open, an air inlet is formed in one side of the silencer frame, and an air outlet is formed in the other side of the silencer frame; the silencing sheets are arranged in the silencer frame at intervals, and cavities are formed between the silencing sheets and the silencer frame and between the silencing sheets; each silencing sheet comprises a silencing sheet perforated plate and a porous sound absorption material filled between the silencing sheet perforated plates; and the frame perforated plate is arranged on the inner side of the silencer frame, and the space between the silencer frame and the frame perforated plate is also filled with the porous sound absorption material. Sound absorption performance is excellent, and installation and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of silencer technology, and in particular to an air inlet silencer. Background Technology

[0002] With the acceleration of industrialization and urbanization, noise pollution has become a significant factor affecting people's quality of life and working environment. Especially in industrial production facilities, data centers, and communication base stations, the noise generated by equipment operation not only impacts the health of workers but can also affect the surrounding environment.

[0003] Equipment cabinet air inlets typically experience high airflow speeds and complex noise levels, making effective noise control crucial. Traditional silencers often have design shortcomings, particularly in achieving efficient noise reduction while simultaneously compromising the slim and lightweight design of the equipment.

[0004] While some existing silencer technologies offer good noise reduction, they are often complex in structure, bulky, and heavy. This not only increases manufacturing costs but also limits their application in space-constrained environments, making them unsuitable for installation in limited equipment cabinets. Furthermore, the heavy structure of some silencers presents additional challenges in installation and maintenance. Utility Model Content

[0005] The purpose of this utility model is to provide an air inlet silencer that solves the problems of high noise and high wind resistance at the air inlet of the equipment cabinet in the prior art, and achieves lightweight and thin installation and use.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides an air inlet silencer, comprising:

[0008] A muffler frame with openings on both sides, one side being an air inlet and the other side being an air outlet;

[0009] The sound-absorbing plate is spaced apart within the muffler frame, and cavities are formed between the sound-absorbing plate and the muffler frame, as well as between the sound-absorbing plates themselves. The sound-absorbing plate includes a perforated plate and a porous sound-absorbing material filled between the perforated plates.

[0010] A perforated frame plate is disposed on the inner side of the muffler frame, and the porous sound-absorbing material is also filled between the muffler frame and the perforated frame plate.

[0011] Furthermore, one corner of the muffler frame is bent inward to form a clearance area.

[0012] Furthermore, the sound-absorbing plates are evenly spaced perpendicular to the gas outlet direction.

[0013] Furthermore, the spacing between two adjacent sound-absorbing plates and the spacing between the sound-absorbing plate and the perforated plate of the frame are equal, with a spacing of 20mm.

[0014] Furthermore, the aperture of the perforated plate of the sound-absorbing sheet is the same as the aperture of the perforated plate of the frame, and the aperture size is 3mm.

[0015] Furthermore, the porosity of the perforated plate of the sound-absorbing sheet is the same as that of the perforated plate of the frame, and the porosity is 23%.

[0016] Furthermore, it also includes a rubber sealing strip, which is installed at the connection between the air inlet silencer and the equipment cabinet, and the rubber sealing strip is used for damping and shock absorption.

[0017] Furthermore, in each of the aforementioned sound-absorbing plates, a first support plate is connected between the perforated plates of the sound-absorbing plates.

[0018] Furthermore, a second support plate is connected between the muffler frame and the frame perforated plate.

[0019] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0020] The present invention provides an air inlet silencer, which forms multiple silencer channels by uniformly installing silencer plates inside the silencer frame. The silencer channels are connected in parallel. By utilizing the viscosity and internal friction of the porous sound-absorbing material built into the silencer plates, the sound energy attenuation loss is increased, and the sound absorption and noise reduction effect is improved.

[0021] In addition, perforated sound-absorbing plates and perforated frame plates are installed to further improve the sound absorption effect through cavity resonance. Attached Figure Description

[0022] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0023] Figure 1 This is a structural schematic diagram of an air inlet silencer provided by this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the muffler frame provided by this utility model;

[0025] Figure 3This is a schematic diagram of the structure of the sound-absorbing sheet provided by this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the first support plate provided by this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the second support plate provided by this utility model;

[0028] Figure 6 A diagram illustrating the modeling loss behavior of the air inlet silencer provided by this utility model;

[0029] The reference numerals in the attached figures are explained as follows:

[0030] 1. Muffler frame; 2. Muffler plate; 201. Muffler plate perforated plate; 202. Porous sound-absorbing material; 3. Frame perforated plate; 4. Rubber sealing strip; 5. First support plate; 6. Second support plate. Detailed Implementation

[0031] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0032] See Figures 1 to 5 The air inlet silencer of this utility model includes a silencer frame 1, a silencer plate 2, and a frame perforated plate 3.

[0033] The aforementioned muffler frame 1 has openings on both sides, one side being an air inlet and the other an air outlet. In this embodiment, the muffler frame 1 is an irregularly shaped frame, with one corner bent inward to form a clearance area to avoid the handles on the equipment cabinet. The specific frame size can be adjusted according to the actual air inlet size of the equipment cabinet.

[0034] The silencer plates 2 are spaced apart within the muffler frame 1. More specifically, the silencer plates 2 are evenly spaced apart within the muffler frame 1, perpendicular to the gas outlet direction. In this embodiment, since the muffler frame 1 is an irregularly shaped frame, the silencer plates 2 are arranged at intervals according to the actual shape of the muffler frame 1. Because one corner of the muffler frame 1 is bent inward to form a clearance area, the size of the silencer plates 2 is also adjusted accordingly. Cavities are formed between the silencer plates 2 and the muffler frame 1, as well as between two adjacent silencer plates 2, forming channels for airflow.

[0035] The sound-absorbing sheet 2 in this embodiment includes two perforated sound-absorbing plates 201 and a porous sound-absorbing material 202 filled between the perforated sound-absorbing plates 201. The porous sound-absorbing material 202 has a large number of interconnected micropores from the surface to the interior, achieving a sound absorption effect through the viscous loss of air within it. Regarding the selection of the porous sound-absorbing material 202, porous sponge, aluminum silicate cotton, mineral wool, rock wool, centrifugal resin glass wool, or glass fiber needle-punched felt can be used. Other porous materials with good sound absorption effects can also be used appropriately.

[0036] In this embodiment, in addition to the perforated plate on the sound-absorbing sheet 2, a frame perforated plate 3 is also provided on the inner side of the aforementioned muffler frame 1. The frame perforated plate 3 is arranged along the side wall of the muffler frame 1, and the porous sound-absorbing material 202 is also filled between the muffler frame 1 and the frame perforated plate 3. The pore size on the sound-absorbing sheet perforated plate 201 is consistent with the pore size and porosity on the frame perforated plate 3. The pore size is generally controlled at 3mm, and the porosity is controlled at 23%. The specific pore size and porosity on the perforated plate can be reasonably adjusted according to actual conditions or needs.

[0037] In this embodiment, the spacing between two adjacent sound-absorbing plates 2 and the spacing between the sound-absorbing plate 2 and the frame perforated plate 3 are also kept consistent, with the spacing size controlled at 20mm.

[0038] In this embodiment, the perforated plate 201 and the porous sound-absorbing material 202 are integrated into the sound-absorbing plate 2. Simultaneously, a frame perforated plate 3 is set on the side wall of the silencer frame 1. The porous sound-absorbing material 202 is also filled between the frame and the perforated plate. It is ensured that the pore size and porosity on the frame perforated plate 3 and the perforated plate 201 are consistent, and the spacing of the air inlet cavities is also consistent. The aim is to maximize the sound absorption performance and ensure the sound absorption and noise reduction effect through the above settings.

[0039] In this embodiment, a rubber sealing strip 4 is also provided. The rubber sealing strip 4 is set at the connection between the air inlet silencer and the equipment cabinet, thereby forming a ring of elastic connection. It utilizes the high bonding strength between rubber and metal surface for bonding, and prevents the generation of secondary structural noise through damping and vibration reduction.

[0040] Furthermore, to prevent deformation of the perforated plate 201 during operation, in this embodiment, a first support plate 5 is provided between the perforated plates 201 in each sound-absorbing sheet 2 for fixing and connecting the perforated plates 201 on both sides. The number of first support plates 5 can be reasonably arranged as needed, as long as the stability of the perforated plate 201 is ensured.

[0041] Similarly, to prevent deformation between the muffler frame 1 and the perforated plate 3 due to airflow impact, in this embodiment, a second support plate 6 is provided between the muffler frame 1 and the perforated plate 3 for fixed connection. The provision of the first support plate 5 and the second support plate 6 provides corresponding stability for the air inlet muffler.

[0042] In this embodiment, the acoustic performance of the disclosed air inlet silencer was also simulated. The specific structural parameters are as follows: the silencer frame 1 has a thickness of 0.05m and a length of 0.2m along the sound wave propagation direction; the silencer plates 2 have a thickness of 0.1m, a plate spacing of 0.02m, and a length of 0.2m along the sound wave propagation direction; the porous sound-absorbing material is 16K sound-absorbing cotton with a thickness of 50mm or 100mm; the perforated plate has a thickness of 0.5mm, a pore diameter of 3mm, and a porosity of 23%.

[0043] A 3D model of the muffler is created in COMSOL, using port boundary conditions to simulate the muffler's inlet and outlet. The main output frequency range is 125Hz~1600Hz, and the transmission loss is represented in 1 / 3 octave band form. Figure 6 As shown, the structure has an average transmission loss of 10.5dB in the 125~1600Hz range.

[0044] In summary, the air inlet silencer disclosed in this utility model, wherein the silencer plate 2 is composed of a perforated plate 201 and a porous sound-absorbing material 202, which can increase the viscosity loss of sound waves, effectively absorb mid-to-high frequency noise, and achieve excellent noise reduction effect.

[0045] Secondly, rubber sealing strip 5 is used to connect the equipment cabinet to the air inlet silencer. The rubber material has high damping and strong absorption of mechanical energy, which can effectively suppress secondary vibration noise of the structure.

[0046] This invention effectively reduces the weight of the muffler by using a plate-type muffler structure and lightweight materials, making it easier to install and use.

[0047] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. An air inlet silencer, characterized in that, include: The muffler frame (1) has openings on both sides, with one side being an air inlet and the other side being an air outlet; The sound-absorbing plate (2) is spaced apart within the muffler frame (1), and cavities are formed between the sound-absorbing plate (2) and the muffler frame (1) and between the sound-absorbing plates (2); the sound-absorbing plate (2) includes a perforated plate (201) and a porous sound-absorbing material (202) filled between the perforated plate (201). The perforated frame plate (3) is disposed on the inner side of the muffler frame (1), and the porous sound-absorbing material (202) is also filled between the muffler frame (1) and the perforated frame plate (3).

2. The air inlet silencer according to claim 1, characterized in that, One corner of the muffler frame (1) is bent inward to form a clearance area.

3. The air inlet silencer according to claim 1, characterized in that, The sound-absorbing plates (2) are evenly spaced perpendicular to the gas outlet direction.

4. The air inlet silencer according to claim 1, characterized in that, The spacing between two adjacent sound-absorbing plates (2) and the spacing between the sound-absorbing plate (2) and the frame perforated plate (3) are equal, and the spacing is 20mm.

5. An air inlet silencer according to claim 1, characterized in that, The aperture of the perforated plate (201) of the sound-absorbing sheet is the same as the aperture of the perforated plate (3) of the frame, and the aperture size is 3mm.

6. An air inlet silencer according to claim 1, characterized in that, The porosity of the sound-absorbing perforated plate (201) is the same as that of the frame perforated plate (3), and the porosity is 23%.

7. An air inlet silencer according to claim 1, characterized in that, It also includes a rubber sealing strip (4), which is installed at the connection between the air inlet silencer and the equipment cabinet. The rubber sealing strip (4) is used for damping and shock absorption.

8. An air inlet silencer according to claim 1, characterized in that, In each of the sound-absorbing plates (2), a first support plate (5) is connected between the perforated plates (201) of the sound-absorbing plates.

9. An air inlet silencer according to claim 1, characterized in that, A second support plate (6) is connected between the muffler frame (1) and the frame perforated plate (3).

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