Air outlet silencer

Abstract

The utility model relates to the technical field of silencers, in particular to an air outlet silencer which solves the problems that in the prior art, noise at an air outlet of an equipment cabinet body is large, wind resistance is large, and heat dissipation of the equipment cabinet body is not facilitated. 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; the flow guide plate is connected with the silencing sheet, the flow guide plate is located at the air inlet of the silencer frame, and a streamline-shaped curved surface used for reducing wind resistance is formed on the surface of the flow guide plate; and the first supporting plate is arranged in the silencing sheet and used for enhancing the structural strength of the silencing sheet. The sound absorption performance is excellent, and heat dissipation of equipment is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of muffler, especially outtake muffler. BACKGROUND

[0002] With the acceleration of industrialization process and the development of urbanization, noise pollution has become an important factor affecting people's quality of life and working environment. Especially in industrial production, data center, communication base station and other places, the noise generated by equipment operation not only affects the health of workers, but also may affect the surrounding environment.

[0003] The air outlet of the equipment cabinet is usually large in wind speed and complex in noise, so effective noise control is particularly important. In order to reduce the noise of the air outlet of the equipment cabinet, the traditional muffler technology is widely used. In the existing muffler technology, although some products can provide good noise reduction effect, they are often complex in structure, large in size and heavy in weight; this not only increases the manufacturing cost of the equipment, but also limits its application in space limited environment, which is not conducive to its installation in the equipment cabinet with limited space.

[0004] In addition, while reducing noise, the traditional muffler often increases air resistance, resulting in the decrease of ventilation efficiency of the equipment and affecting the normal operation and heat dissipation effect of the equipment. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing an air outlet muffler, which solves the problem of large noise and large air resistance at the air outlet of the equipment cabinet body in the prior art, which is not conducive to the heat dissipation of the equipment cabinet body.

[0006] To achieve the above purpose, the utility model adopts the technical scheme of:

[0007] The utility model provides an air outlet muffler, which comprises:

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

[0009] Noise reduction sheets, which are arranged in the muffler frame in intervals, and cavities are formed between the noise reduction sheets and the muffler frame and between the noise reduction sheets;

[0010] A flow guide plate, which is connected with the noise reduction sheets and located at the air inlet of the muffler frame, and the surface of the flow guide plate is formed with a streamline curved surface for reducing air resistance;

[0011] A first support plate, which is arranged inside the noise reduction sheets and used for enhancing the structural strength of the noise reduction sheets.

[0012] Further, the cross section of the streamline curved surface is arc-shaped, and the radius of the arc-shaped surface is 50 mm.

[0013] Further, the sound-absorbing sheets are uniformly and vertically arranged.

[0014] Further, the sound-absorbing sheets comprise sound-absorbing sheet perforated plates and porous sound-absorbing materials filled between the sound-absorbing sheet perforated plates.

[0015] Further, a frame perforated plate is arranged on the inner side of the sound absorber frame, and the sound absorber frame and the frame perforated plate are also filled with the porous sound-absorbing materials.

[0016] Further, the spacing between two adjacent sound-absorbing sheets and the spacing between the sound-absorbing sheet and the frame perforated plate are equal, and the spacing is 20 mm.

[0017] Further, the aperture and porosity of the sound-absorbing sheet perforated plate are consistent with the aperture and porosity of the frame perforated plate, the aperture is 3 mm, and the porosity is 23%.

[0018] Further, the first support plate is connected between the sound-absorbing sheet perforated plates.

[0019] Further, the second support plate is connected between the sound absorber frame and the frame perforated plate.

[0020] Further, a rubber sealing strip is arranged at the connection between the air outlet sound absorber and the equipment cabinet body, and the rubber sealing strip is used for damping and shock absorption.

[0021] Due to the above technical scheme, the utility model has the following advantages compared with the prior art:

[0022] The air outlet sound absorber comprises a sound absorber frame, a plurality of sound-absorbing sheets arranged in the sound absorber frame, and a frame perforated plate arranged on the inner side of the sound absorber frame.

[0023] Secondly, a flow guide head is arranged at the air inlet of the sound absorber, and the flow guide head is designed as an arc-shaped structure, which can effectively reduce the resistance of airflow when entering the sound absorber, reduce the regenerative noise caused by airflow impact, guide the airflow to be uniformly distributed to each part of the sound absorber, and ensure that the sound-absorbing material can fully play its sound-absorbing performance.

[0024] In addition, the first support plate is arranged in the sound-absorbing sheet to enhance the overall strength and rigidity of the sound-absorbing sheet, so that the sound-absorbing sheet is not easy to deform when subjected to airflow impact, thereby prolonging the service life. Attached Figure Description

[0025] 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:

[0026] Figure 1 This is a structural schematic diagram of an air outlet silencer provided by this utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the air outlet silencer after removing the guide plate provided by this utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the muffler frame provided by this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the sound-absorbing sheet provided by this utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the first support plate provided by this utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the second support plate provided by this utility model;

[0032] Figure 7 A diagram illustrating the modeling loss behavior of the air outlet silencer provided by this utility model;

[0033] The reference numerals in the attached figures are explained as follows:

[0034] 1. Muffler frame; 2. Muffler plate; 201. Perforated plate of muffler plate; 202. Porous sound-absorbing material; 3. Guide plate; 4. First support plate; 5. Perforated plate of frame; 6. Second support plate; 7. Rubber sealing strip. Detailed Implementation

[0035] 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.

[0036] See Figures 1 to 6 The air outlet silencer of this utility model includes a silencer frame 1, a silencer plate 2, a guide plate 3, and a first support plate 4.

[0037] The muffler frame 1 has two side openings, one for the air inlet and the other for the air outlet. In this embodiment, the muffler frame 1 is a rectangular frame, and the size of the frame can be adjusted according to the actual size of the air outlet of the equipment cabinet. The shape of the frame can also be adjusted according to the air outlet of the equipment cabinet. The muffler frame 1 can also be circular.

[0038] The sound-absorbing sheets 2 are arranged in the muffler frame 1 in a spaced manner. More specifically, the sound-absorbing sheets 2 are arranged in the muffler frame 1 in a uniform and vertical manner to the direction of the gas outlet. Cavities are formed between the sound-absorbing sheets 2 and the muffler frame 1 and between adjacent sound-absorbing sheets 2, which form channels for the airflow to pass through.

[0039] The sound-absorbing sheets 2 in this embodiment include two sound-absorbing sheet perforated plates 201 and porous sound-absorbing materials 202 filled between the sound-absorbing sheet perforated plates 201. The porous sound-absorbing materials 202 have a large number of interconnected micropores from the surface to the inside, and the air passing through the micropores achieves the sound-absorbing effect through viscous dissipation. The selection of the porous sound-absorbing materials 202 can be porous sponge, aluminum silicate cotton, mineral wool, rock wool, centrifugal resin glass wool, or glass fiber needle felt. Other porous materials that have good sound-absorbing effect can also be used adaptively.

[0040] In this embodiment, a deflector 3 is also provided, which is arranged at the air inlet of the muffler frame 1 and connected with the sound-absorbing sheets 2. The deflector 3 and the sound-absorbing sheets 2 can be connected by hinging or other fixed connection, as long as they do not shift or fall off during cooperation.

[0041] The surface of the deflector 3 in this embodiment is formed with a streamline curved surface for reducing wind resistance, and the cross section is an arc with a radius of 50 mm. The design of the deflector 3 facilitates the airflow into the muffler and reduces the noise generated by airflow friction. When the airflow impacts the arc-shaped deflector, it will produce a series of differences in flow characteristics and aerodynamic characteristics compared to directly impacting the end face of the sound-absorbing sheet 2. Specifically, when the airflow directly impacts the sound-absorbing sheet 2, due to its flat edge, the airflow is prone to flow separation when impacting the end face, forming a vortex region, which may cause greater resistance and pulsating flow. The curved surface of the arc-shaped deflector can better guide the airflow, reduce flow separation, and the airflow flows relatively smoothly along the curved surface, thereby reducing resistance.

[0042] In this embodiment, in addition to the perforated plate on the sound-absorbing sheet 2, a frame perforated plate 5 is also provided on the inner side of the muffler frame 1. The frame perforated plate 5 is arranged along the side wall of the muffler frame 1, and the muffler frame 1 and the frame perforated plate 5 are also filled with the porous sound-absorbing material 202. The hole diameter size on the sound-absorbing sheet perforated plate 201 is consistent with the hole diameter size and porosity on the frame perforated plate 5. The hole diameter size is generally controlled at 3 mm, and the porosity is controlled at 23%. The specific hole diameter size and porosity size on the perforated plate can be reasonably adjusted according to actual conditions or needs.

[0043] In this embodiment, the spacing between the two adjacent sound-absorbing sheets 2 and the spacing between the sound-absorbing sheet 2 and the frame perforated plate 5 are also consistent, and the spacing size is controlled at 20 mm.

[0044] In this embodiment, the sound-absorbing sheet perforated plate 201 and the porous sound-absorbing material 202 are integrated into the sound-absorbing sheet 2, and the frame perforated plate 5 is provided on the side wall of the muffler frame 1 at the same time. The porous sound-absorbing material 202 is also filled between the frame and the perforated plate, and the hole diameter size and porosity size on the frame perforated plate 5 and the sound-absorbing sheet perforated plate 201 are consistent. The spacing size of the air inlet cavity is also consistent, which aims to maximize the sound-absorbing performance and ensure the sound-absorbing and noise-reducing effect through the above settings.

[0045] In this embodiment, a rubber sealing strip 7 is also provided, which is arranged at the connection between the air outlet muffler and the equipment cabinet body, thereby forming a circle of elastic connection. The rubber is bonded by taking advantage of the strong bonding strength of rubber and metal surface, and the damping vibration reduction effect is used to prevent the generation of structural secondary noise.

[0046] In addition, in order to avoid deformation of the sound-absorbing sheet perforated plate 201 during operation, in this embodiment, a first support plate 4 is arranged between the sound-absorbing sheet perforated plates 201 in each sound-absorbing sheet 2, which is used to fixedly connect the sound-absorbing sheet perforated plates 201 on both sides. The number of the first support plate 4 can be reasonably arranged according to needs, as long as the stability of the sound-absorbing sheet perforated plate 201 is ensured.

[0047] Similarly, in order to avoid deformation between the muffler frame 1 and the frame perforated plate 5 due to airflow impact, a second support plate 6 is arranged between the muffler frame 1 and the frame perforated plate 5 in this embodiment, which is used to fixedly connect the muffler frame 1 and the frame perforated plate 5. The arrangement of the first support plate 4 and the second support plate 6 provides corresponding stability for the air outlet muffler.

[0048] In this embodiment, the disclosed air outlet muffler is also simulated for acoustic performance, and specific structural parameters are as follows: the length of the muffler frame is 0.05 m, the length along the sound wave propagation direction is 0.4 m; the thickness of the two sound-absorbing sheets is 0.1 m, the sheet distance is 0.02 m, and the length along the sound wave propagation direction is 0.4 m; the porous sound-absorbing material is 16K sound-absorbing cotton with a thickness of 50 mm or 100 mm; the thickness of the perforated plate is 0.5 mm, the hole diameter is 3 mm, and the porosity is 23%.

[0049] The three-dimensional model of the muffler is modeled in COMSOL, the inlet and outlet of the muffler are simulated by using a port boundary condition, the transmission loss in the frequency range of 125 Hz to 1600 Hz is mainly output, and the transmission loss is expressed in the form of 1 / 3 octave band, as shown in the following formula: Figure 7 The average transmission loss of the structure in the range of 125 to 1600 Hz is 20 dB.

[0050] In summary, the air outlet muffler disclosed in the utility model has the advantages that the sound-absorbing sheet 2 is combined with the perforated plate 201 and the porous sound-absorbing material 202, the viscous loss of sound waves can be increased, the middle and high frequency noise can be effectively absorbed, and excellent noise reduction effect can be achieved.

[0051] Secondly, the equipment cabinet and the air outlet muffler are connected by using the rubber sealing strip 7, the rubber material has large damping and strong absorption of mechanical energy, and can effectively suppress the secondary vibration noise of the structure.

[0052] In addition, the arc-shaped guide plate design can effectively reduce the resistance of airflow when entering the muffler, reduce the regenerative noise generated by airflow impact, guide the airflow to be uniformly distributed to each part of the muffler, thereby optimizing the airflow distribution, ensuring that the sound-absorbing material can fully play its sound-absorbing performance, and improving the aerodynamic performance and adapting to different airflow conditions.

[0053] In the utility model, the weight of the muffler is effectively reduced by the design of the sheet type muffler structure and the application of light materials, and the installation and use are facilitated.

[0054] The above embodiments are only for illustrating the technical concept and characteristics of the utility model, the purpose is to enable people skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model, and equivalent changes or modifications made according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. An air outlet silencer, characterized by, It includes: The muffler frame (1) is open on both sides, one side is the air inlet, the other side is the air outlet; The sound absorbing sheet (2) is arranged in the muffler frame (1), and the sound absorbing sheet (2) and the muffler frame (1) and the sound absorbing sheet (2) form a cavity; The guide plate (3) is connected with the sound absorbing sheet (2), and the guide plate (3) is located at the air inlet of the muffler frame (1), and the surface of the guide plate (3) forms a streamline curved surface for reducing wind resistance; The first support plate (4) is arranged in the sound absorbing sheet (2), and the first support plate (4) is used for enhancing the structural strength of the sound absorbing sheet (2).

2. An air outlet silencer according to claim 1, wherein The cross section of the streamline curved surface is arc, and the radius of the arc is 50mm.

3. An air outlet silencer according to claim 1, wherein The sound absorbing sheet (2) is arranged uniformly in the direction perpendicular to the gas outlet.

4. An air outlet silencer according to claim 1, wherein The sound absorbing sheet (2) includes two sound absorbing sheet perforated plates (201) and porous sound absorbing material (202) filled between the sound absorbing sheet perforated plates (201).

5. An air outlet silencer according to claim 4, wherein It also includes a frame perforated plate (5), which is arranged on the inner side of the muffler frame (1), and the muffler frame (1) and the frame perforated plate (5) are also filled with the porous sound absorbing material (202).

6. An air outlet silencer according to claim 5, wherein The distance between the two adjacent sound absorbing sheets (2) and the distance between the sound absorbing sheet (2) and the frame perforated plate (5) are equal, and the distance is 20mm.

7. An air outlet silencer according to claim 5, wherein The aperture and porosity of the sound absorbing sheet perforated plate (201) are consistent with the aperture and porosity of the frame perforated plate (5), the aperture is 3mm, and the porosity is 23%.

8. An air outlet silencer according to claim 4, wherein The first support plate (4) is connected between the sound absorbing sheet perforated plates (201).

9. An air outlet silencer according to claim 5, wherein The second support plate (6) is connected between the muffler frame (1) and the frame perforated plate (5).

10. The air outlet silencer of claim 1, wherein It also includes a rubber sealing strip (7), which is arranged at the connection between the air outlet muffler and the equipment cabinet body, and is used for damping and shock absorption.

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