Reflection type impedance complex muffler

Abstract

The utility model discloses air conditioning system silencing technical field's reflection type impedance composite muffler, including composite muffler's casing, the casing both ends respectively weld and install the flange, the casing inboard fixed mounting has first galvanized perforated plate, the casing inboard and be located first galvanized perforated plate both sides respectively through rivet fixed mounting has second galvanized perforated plate, the first galvanized perforated plate and second galvanized perforated plate inboard all fill with glass wool, and the casing outside includes four galvanized steel sheets, installs through the flange of casing both ends multiple casing, and the glass wool in the first galvanized perforated plate and second galvanized perforated plate inboard fills and is wrapped through glass silk cloth outside, and two second galvanized perforated plates are located first galvanized perforated plate's both sides can effectively prolong sound propagation path, reduce sound propagation energy, improve the effect that the muffler sound insulation and sound elimination.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction in air conditioning systems, specifically a reflective impedance composite silencer. Background Technology

[0002] This utility model belongs to the field of noise control equipment and is mainly used in industrial power systems, HVAC, ventilation ducts and other scenarios. It provides an efficient noise reduction solution for mid-to-high frequency noise generated by gas flow and is suitable for complex acoustic environments that need to balance reactive noise reduction (suppressing low-frequency noise) and resistive noise reduction (absorbing mid-to-high frequency noise). Current mainstream impedance composite silencers achieve noise reduction through a combination of "resistive expansion chamber + resistive sound-absorbing material," but they have significant shortcomings. The sound waves have a short residence time inside the silencer, and some mid-to-high frequency noise is discharged before being fully absorbed by the sound-absorbing material, resulting in low noise reduction efficiency. They also lack targeted reflection structures, and the sound energy relies solely on natural diffusion and contact with the material, without forming multi-path reflection and superposition absorption. Their ability to handle complex frequency band noise is limited, making it difficult to meet the higher noise reduction standards after the upgrading of current industrial equipment.

[0003] With increasingly stringent industrial noise reduction regulations and rising requirements for sound attenuation and energy efficiency in HVAC and power systems, traditional impedance composite silencers are no longer adequate for the demands of high-efficiency noise reduction and low-carbon operation. They cannot extend the residence time of sound waves through reflective structures, nor can they guide sound energy to reflect multiple times and come into contact with sound-absorbing materials, thus reducing the sound energy absorption effect. Furthermore, they are prone to increasing energy consumption. They cannot simultaneously improve sound attenuation performance and achieve energy-saving and low-carbon characteristics, which is the core problem of insufficient sound attenuation in traditional equipment. Therefore, it is necessary to design reflective impedance composite silencers to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a reflective impedance composite silencer to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a reflective impedance composite silencer, comprising a housing of the composite silencer, flanges welded to both ends of the housing, a first galvanized perforated plate fixedly installed on the inner side of the housing, and a second galvanized perforated plate fixedly installed on the inner side of the housing and on both sides of the first galvanized perforated plate by rivets, wherein the inner sides of both the first and second galvanized perforated plates are filled with glass wool.

[0006] Preferably, the second galvanized perforated plate has two notches on one side, and the second galvanized perforated plate includes a first perforated plate and a second perforated plate, with two layers of glass wool filling between the first perforated plate and the second perforated plate.

[0007] Preferably, a reflector is fixedly installed on both sides of the inside of the housing, on the side of the notch.

[0008] Preferably, a sound-absorbing sheet is embedded on the inner side of the first galvanized perforated plate.

[0009] Preferably, a partition plate is fixedly installed between the housing and the second galvanized perforated plate.

[0010] Preferably, fixing blocks are welded to both ends of the first galvanized perforated plate, and limiting blocks are welded to both ends of the housing and on the flange side. The fixing blocks and limiting blocks are fixed together by bolts.

[0011] Preferably, the cross-section of the fixing block is an isosceles triangle.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. The outer shell consists of four galvanized steel plates. Multiple shells are installed through flanges at both ends of the shell. The glass wool filling inside the first and second galvanized perforated plates is wrapped with fiberglass cloth. As a porous sound-absorbing material, the glass wool converts sound energy into heat energy through its internal microporous structure, mainly absorbing mid-to-high frequency noise (such as metal friction sound and airflow noise). The fiberglass cloth wrapping can enhance the structural stability and reduce the transmission of low-frequency vibrations. The two second galvanized perforated plates are located on both sides of the first galvanized perforated plate, which can effectively extend the sound propagation path, reduce the sound propagation energy, and improve the sound insulation and noise reduction effect of the silencer.

[0013] 2. The double-layer sound-absorbing material filling between the first and second perforated plates enhances the absorption of noise energy. The first and second perforated plates can delay the residence time of sound waves inside the silencer, so that some sound energy is avoided from being transmitted to the acoustic environment due to reflection and sound absorption. These characteristics have the value of noise reduction, energy saving and low carbon emissions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a left-side sectional perspective view of the overall structure of this utility model; Figure 3 The overall structure of this utility model Figure 2 Enlarged view of point A in the middle.

[0015] In the figure: 1. Shell; 2. Flange; 3. First galvanized perforated plate; 4. Second galvanized perforated plate; 5. Notch; 6. Reflector baffle; 7. Reflector plate; 8. Sound-absorbing plate; 9. Separator plate; 10. Fixing block; 11. Limiting block; 401. First perforated plate; 402. Second perforated plate. Detailed Implementation

[0016] 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.

[0017] Example 1 Please refer to Figure 1-3 As shown, this utility model provides a reflective impedance composite silencer, including a housing 1 of the composite silencer. Flanges 2 are welded and installed at both ends of the housing 1. A first galvanized perforated plate 3 is fixedly installed on the inner side of the housing 1. A second galvanized perforated plate 4 is fixedly installed on the inner side of the housing 1 and on both sides of the first galvanized perforated plate 3 by rivets. The inner sides of the first galvanized perforated plate 3 and the second galvanized perforated plate 4 are both filled with glass wool. A partition plate 9 is fixedly installed between the housing 1 and the second galvanized perforated plate 4. Fixing blocks 10 are welded to both ends of the first galvanized perforated plate 3. Limiting blocks 11 are welded to both ends of the housing 1 and on one side of the flange 2. The fixing blocks 10 and the limiting blocks 11 are fixed by bolts. The cross section of the fixing block 10 is an isosceles triangle.

[0018] In addition, the partition plate 9 can increase the fixing strength of the second galvanized perforated plate 4. The partition plate 9 can separate the sound. The outer side of the shell 1 includes four galvanized steel plates. Multiple shells 1 are installed through the flanges 2 at both ends of the shell 1. The glass wool filled inside the first galvanized perforated plate 3 and the second galvanized perforated plate 4 is wrapped with glass fiber cloth. As a porous sound-absorbing material, glass wool converts sound energy into heat energy through its internal microporous structure. It mainly absorbs mid-to-high frequency noise (such as metal friction sound and airflow noise). The glass fiber cloth wrapping can enhance the structural stability and reduce the transmission of low-frequency vibration. The two second galvanized perforated plates 4 are located on both sides of the first galvanized perforated plate 3, which can effectively extend the sound propagation path, reduce the sound propagation energy, and improve the sound insulation and noise reduction effect of the silencer.

[0019] Furthermore, the fixed block 10 has an isosceles triangle cross section, and the limiting block 11 has a groove space for the fixed block 10 to be embedded on one side. The fixed block 10 and the limiting block 11 are then installed and fixed by bolts passing through them, which improves the convenience and stability of disassembling and installing the first galvanized perforated plate 3.

[0020] Specifically, the second galvanized perforated plate 4 has two notches 5 on one side. The second galvanized perforated plate 4 includes a first perforated plate 401 and a second perforated plate 402. Two layers of glass wool are filled between the first perforated plate 401 and the second perforated plate 402.

[0021] The double-layer sound-absorbing material filling the space between the first perforated plate 401 and the second perforated plate 402 enhances the absorption of noise energy. The first perforated plate 401 and the second perforated plate 402 can delay the residence time of sound waves inside the silencer, so that some sound energy is avoided from being transmitted to the acoustic environment due to reflection and sound absorption. These characteristics have the value of noise reduction, energy saving and low carbon emissions.

[0022] More specifically, a reflector 7 is fixedly installed on both sides inside the housing 1, located on the side of the notch 5.

[0023] It should be added that reflective baffle 6 and reflective plate 7 can be selected and installed as needed. The cross-section of reflective plate 7 is an isosceles triangular plate. The reflective wedge of reflective plate 7 and the sound-absorbing material inside the second galvanized perforated plate 4 enhance the absorption of noise sound energy. Furthermore, the reflective baffle 6 is used to delay the residence time of sound waves inside the silencer, so that some sound energy is avoided from being transmitted to the acoustic environment due to reflection and sound absorption, which can effectively improve the sound insulation and noise reduction protection effect.

[0024] Furthermore, a sound-absorbing plate 8 is embedded inside the first galvanized perforated plate 3. The sound-absorbing plate 8 cancels out low- and mid-frequency noise through sound wave reflection and interference. The resistive sound-absorbing plate 8 is made of glass fiber sound-absorbing material, which is suitable for high-frequency noise, so that the sound-absorbing plate 8 can further reduce noise.

[0025] Working principle: First, sound passes through the housing 1 and propagates inside the housing 1. During propagation, sound absorption and insulation are performed. At this time, the first galvanized perforated plate 3 and the second galvanized perforated plate 4 isolate the sound. At the same time, the double-layer sound-absorbing material filled between the first layer of perforated plate 401 and the second layer of perforated plate 402 enhances the absorption of noise energy. The first layer of perforated plate 401 and the second layer of perforated plate 402 delay the residence time of the sound wave inside the silencer. In addition, the reflective wedge of the reflector plate 7 and the sound-absorbing material on the inner side of the second galvanized perforated plate 4 further enhance the absorption of noise energy. At the same time, the sound-absorbing plate 8 further reduces noise.

[0026] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0027] Although the present invention 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 the present invention should be included within the protection scope of the present invention.

Claims

1. A reflective impedance composite silencer, comprising a housing (1) of the composite silencer, characterized in that: Flanges (2) are welded to both ends of the housing (1). A first galvanized perforated plate (3) is fixedly installed on the inner side of the housing (1). A second galvanized perforated plate (4) is fixedly installed on the inner side of the housing (1) and on both sides of the first galvanized perforated plate (3) by rivets. The inner sides of the first galvanized perforated plate (3) and the second galvanized perforated plate (4) are filled with glass wool.

2. The reflective impedance composite silencer according to claim 1, characterized in that: The second galvanized perforated plate (4) has two notches (5) on one side. The second galvanized perforated plate (4) includes a first perforated plate (401) and a second perforated plate (402). Two layers of glass wool are filled between the first perforated plate (401) and the second perforated plate (402).

3. The reflective impedance composite silencer according to claim 2, characterized in that: A reflector plate (7) is fixedly installed on both sides of the inside of the housing (1) and on the side of the notch (5).

4. The reflective impedance composite silencer according to claim 3, characterized in that: The first galvanized perforated plate (3) has a sound-absorbing plate (8) embedded on its inner side.

5. The reflective impedance composite silencer according to claim 3, characterized in that: A partition plate (9) is fixedly installed between the shell (1) and the second galvanized perforated plate (4).

6. The reflective impedance composite silencer according to claim 2, characterized in that: The first galvanized perforated plate (3) has a fixing block (10) welded to both ends, and a limit block (11) welded to both ends of the housing (1) and on one side of the flange (2). The fixing block (10) and the limit block (11) are fixed together by bolts.

7. The reflective impedance composite silencer according to claim 6, characterized in that: The cross-section of the fixed block (10) is an isosceles triangle.

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