CN220083302U - Impedance combined type ventilation muffler - Google Patents
Impedance combined type ventilation muffler Download PDFInfo
- Publication number
- CN220083302U CN220083302U CN202321300149.2U CN202321300149U CN220083302U CN 220083302 U CN220083302 U CN 220083302U CN 202321300149 U CN202321300149 U CN 202321300149U CN 220083302 U CN220083302 U CN 220083302U
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- impedance composite
- sound
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- muffler
- impedance
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- 238000009423 ventilation Methods 0.000 title claims abstract description 17
- 239000002131 composite material Substances 0.000 claims abstract description 48
- 239000011358 absorbing material Substances 0.000 claims description 17
- 230000030279 gene silencing Effects 0.000 claims description 12
- 238000010521 absorption reaction Methods 0.000 claims description 11
- 238000009413 insulation Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 230000008030 elimination Effects 0.000 abstract description 9
- 238000003379 elimination reaction Methods 0.000 abstract description 9
- 230000003584 silencer Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000013016 damping Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229920005830 Polyurethane Foam Polymers 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011491 glass wool Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000011496 polyurethane foam Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Abstract
The utility model relates to the technical field of ventilation silencers, and particularly discloses an impedance composite type ventilation silencer, wherein a first impedance composite section and a second impedance composite section are arranged in the utility model and can be combined to form an impedance composite section, and the impedance composite section in the silencer can be combined into one section or multiple sections; each section can be aimed at the same frequency, and can also be aimed at different frequencies so as to meet different noise sources and different noise elimination requirements; the length of the muffler is shortened, the cost is reduced, and the noise reduction performance of low, medium and high frequency noise of the muffler is ensured.
Description
Technical Field
The utility model relates to the technical field of ventilation silencers, in particular to an impedance composite type ventilation silencer.
Background
Common mufflers are mainly classified into four types of resistance, composite type and exhaust blow-down type.
The resistive muffler mainly utilizes a porous sound absorption material arranged in the gas flow channel to absorb sound energy so as to achieve the purpose of silencing, and is mainly suitable for reducing noise in medium frequency and high frequency bands;
the resistive muffler is a muffler which reflects part of sound waves in the direction of an echo source through abrupt change of acoustic characteristics in a pipeline so as to achieve the purpose of silencing, and is mainly suitable for reducing noise in low frequency and low-medium frequency bands.
At present, most of ventilation silencers used in noise reduction engineering of industrial plants, ventilation air conditioning systems, heat exchange equipment and the like are resistive silencers, but the noise sources generally have higher low-frequency components, the low-frequency silencing performance of the resistive silencers is poor, the noise reduction effect is not ideal, and the resistive silencers with longer effective lengths generally have to be adopted in actual use, so that certain resource waste is caused.
Disclosure of Invention
In view of the above problems, the present utility model provides an impedance composite ventilation muffler, which aims to reduce the cost of the muffler and also ensure the noise reduction performance of the muffler for low, medium and high frequency noise.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
there is provided an impedance composite ventilation muffler comprising: the device comprises a shell, a first type of silencing unit arranged in the shell and a second type of silencing unit arranged on the inner wall surface of the shell, wherein the first type of silencing unit comprises: the sound absorption device comprises a first impedance composite section, a first resistance functional chamber and a functional section, wherein the first impedance composite section, the first resistance functional chamber and the functional section are arranged along the airflow direction, and sound absorption materials are arranged in the first impedance composite section at fixed intervals along the airflow direction and perpendicular to the airflow direction; the second class of sound attenuating units include: the second impedance composite section, the second resistance functional chamber and the functional section are arranged along the airflow direction, and sound absorbing materials are also arranged in the second impedance composite section at fixed distances along the direction perpendicular to the airflow direction.
Further, the muffler further includes: the sound-absorbing device comprises a shell, a plurality of sound-absorbing units, a plurality of sound-absorbing plates and sound-insulating plates, wherein the sound-absorbing units are arranged on the side surfaces of the sound-absorbing units, which are far away from the shell, and the upper side surfaces and the lower side surfaces of the sound-absorbing units, and a resistance function cavity for installing sound-absorbing materials is formed between the sound-insulating plates and the sound-absorbing plates.
Further, sound insulation plates are installed between the sound absorbing materials installed in the height direction in the first impedance composite section.
Further, the perforation rate of the diversion perforated plate is not lower than 20%.
Further, baffle plates are detachably installed at both ends of the first type of silencing units and the second type of silencing units in the airflow direction in an inclined and fixed angle mode.
Further, a rainproof device is arranged at the air outlet of the shell.
The utility model is provided with the first impedance composite section and the second impedance composite section, which can be combined to form the impedance composite section, and the impedance composite section in the muffler can be combined into one section or multiple sections; each section can be aimed at the same frequency, and can also be aimed at different frequencies so as to meet different noise sources and different noise elimination requirements; the length of the muffler is shortened, the cost is reduced, and the noise reduction performance of low, medium and high frequency noise of the muffler is ensured.
Drawings
Fig. 1 is a schematic view of a housing according to embodiment 1 of the present utility model.
Fig. 2 is a schematic view illustrating the internal installation of a housing according to embodiment 1 of the present utility model.
Fig. 3 is a cross-sectional view A-A of fig. 2.
Fig. 4 is a schematic structural diagram of a muffler unit of the type provided in embodiment 1 of the present utility model.
Fig. 5 is a schematic structural diagram of a second class of muffler units according to embodiment 1 of the present utility model.
Fig. 6 is a schematic structural diagram of a first impedance composite section according to embodiment 1 of the present utility model.
Fig. 7 is a schematic structural diagram of a second impedance composite section according to embodiment 1 of the present utility model.
Fig. 8 is a schematic view illustrating the internal installation of a housing according to embodiment 2 of the present utility model.
1, a shell; 2. a class of sound attenuating units; 21. a first impedance composite section; 22. a first resistance function chamber; 23. a functional section; 3. a second class of sound attenuation units; 31. a second impedance composite section; 32. a second resistance functional chamber; 4. a sound absorbing material; 5. a flow guiding perforated plate; 6. a sound insulation board; 7. a deflector; 8. and (3) a shutter.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Example 1
Referring to fig. 1 to 3, an embodiment of the present utility model discloses an impedance composite type ventilation muffler, comprising: the casing 1, install in the first class noise elimination unit 2 of casing 1 and install the second class noise elimination unit 3 on casing 1 internal wall face, first class noise elimination unit 2 includes: a first impedance composite section 21, a first resistance functional chamber 22 and a functional section 23 arranged along the air flow direction, and sound absorbing materials 4 are installed in the first impedance composite section 21 at fixed distances along the air flow direction and perpendicular to the air flow direction; the second type of sound attenuating unit 3 includes: a second impedance composite section 31, a second resistance functional chamber 32 and a functional section 23 arranged along the air flow direction, and sound absorbing materials 4 are also installed in the second impedance composite section 31 at a fixed distance along the air flow direction;
referring to fig. 4 to 7, in the present utility model, the sound absorbing material 4 is installed in each of the functional section 23, the first impedance composite section 21 and the second impedance composite section 31, and middle-high frequency noise is eliminated by the sound absorbing material 4; the sound absorbing material 4 is porous sound absorbing material 4 commonly used in the market, such as glass wool, rock wool, mineral wool, polyurethane foam plastic and the like.
The sound absorbing material 4 is installed in the first impedance composite section 21 at a fixed distance in both the air flow direction and perpendicular to the air flow direction, and it is understood that a plurality of one type of sound absorbing units 2 are installed in the housing 1 in the direction perpendicular to the air flow direction, and the first and second resistance function chambers 22 and 32 are on the same vertical plane. In the present embodiment, a cross-shaped cavity is formed in the first impedance composite section 21 by installing the sound absorbing material 4 and communicates with the first resistance function chamber 22, and the elimination work of low frequency noise of a certain frequency is completed by the cross-shaped cavity and the first resistance function chamber 22.
It is readily appreciated that the length, width and height of the cross-shaped cavity, the first resistive functional chamber 22 and the second resistive functional chamber 32 all have a greater impact on the low frequency muffling performance of the muffler, and controlling the volumes of the cross-shaped cavity, the first resistive functional chamber 22 and the second resistive functional chamber 32 can meet the low frequency noise requirements of different peaks.
And different mounting structures can be flexibly adopted in the functional section 23, the cross-shaped cavity, the first resistance functional chamber 22 and the second resistance functional chamber 32:
a resistive sound damping structure may be employed: i.e. completely filled with sound absorbing material 4.
Resistant sound damping structures may also be employed: i.e. designed for a certain low frequency and filled with sound absorbing material 4 inside the cross-shaped cavity, the first resistant functional chamber 22 and the second resistant functional chamber 32, enhancing the low frequency sound damping performance of the muffler.
It can be seen that the first impedance composite section 21 and the second impedance composite section 31 can be combined to form an impedance composite working section for completing resistive noise elimination and resistive noise elimination, and the impedance composite section combination in the muffler can be one section or multiple sections; each segment can be aimed at the same frequency, or can be aimed at different frequencies so as to meet different noise sources and different noise elimination requirements.
Further, the muffler further includes: the sound-absorbing material comprises a flow-guiding perforated plate 5 and sound-insulating plates 6, wherein the flow-guiding perforated plate 5 is arranged on the side surface of the first-class sound-absorbing unit 2, which is far away from the shell 1, and the upper side surface and the lower side surface of the second-class sound-absorbing unit 3, and a resistance function cavity for installing the sound-absorbing material 4 is formed between the plurality of sound-insulating plates 6 and the flow-guiding perforated plate 5.
Specifically, the flow guiding perforated plate 5 can be made of metal materials, polymer materials, wood, cement or gypsum, and the like, so that the resistance loss of the muffler can be reduced while the acoustic impedance change caused by the change of the sectional area of the muffler is ensured, and the perforation rate of the flow guiding perforated plate 5 is not lower than 20%.
Further, a sound insulation board 6 is arranged between the sound absorption materials 4 arranged in the first impedance composite section 21 along the height direction, and the sound insulation board 6 can be made of materials such as metal materials, high polymer materials, wood, cement boards or gypsum boards; it will be appreciated that the housing 1 is also made of a sound insulating plate 6.
Referring to fig. 2, a baffle 7 can be additionally arranged at two ends of the first type of silencing units 2 and the second type of silencing units 3 along the airflow direction, and the baffle 7 can be in a circular arc shape, a triangular shape or a streamline shape.
A rainproof device 8 can be additionally arranged at the air outlet of the shell 1. Of course, the rain-proof device 8 and the deflector 7 should be reasonably selected according to the actual working condition to be used or not.
In this embodiment, the rainproof device 8 is a rainproof shutter.
Example 2
Referring to fig. 8, embodiment 2 is different from embodiment 1 in that the flow guiding perforated plates 5 mounted on the side of the first type of sound attenuating unit 2 far from the housing 1 and the upper and lower sides of the second type of sound attenuating unit 3 are mounted at a fixed angle in an inclined manner, so that the first type of sound attenuating unit 2 and the second type of sound attenuating unit 3 are mounted in a wave shape, and by means of this mounting, part of noise can be reflected to the echo source direction, and a certain resistance sound attenuating capability is improved.
It will be apparent to those skilled in the art that while preferred embodiments of the present utility model have been described, additional variations and modifications may be made to these embodiments once the basic inventive concepts are known to those skilled in the art. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the utility model. It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. An impedance composite ventilation muffler, comprising: the device is characterized by comprising a shell (1), a class-II silencing unit (2) arranged in the shell (1) and a class-II silencing unit (3) arranged on the inner wall surface of the shell (1),
the noise abatement unit (2) of the type comprises: a first impedance composite section (21), a first resistance functional chamber (22) and a functional section (23) which are arranged along the air flow direction, and sound absorption materials (4) are arranged in the first impedance composite section (21) at fixed intervals along the air flow direction and perpendicular to the air flow direction;
the second class of sound attenuating units (3) comprise: the sound absorption device comprises a second impedance composite section (31), a second resistance functional chamber (32) and a functional section (23) which are arranged along the airflow direction, and sound absorption materials (4) are also arranged in the second impedance composite section (31) at fixed distances along the airflow direction.
2. The impedance composite ventilation muffler of claim 1, further comprising: the sound absorption device comprises a shell (1) and is characterized by comprising a flow guide perforated plate (5) and sound insulation plates (6), wherein the flow guide perforated plate (5) is arranged on the side surface of one type of sound absorption unit (2) away from the shell (1) and the upper side surface and the lower side surface of the other type of sound absorption unit (3), and a plurality of resistance function chambers for installing sound absorption materials (4) are formed between the sound insulation plates (6) and the flow guide perforated plate (5).
3. Impedance composite ventilation muffler according to claim 2, characterized in that the sound insulation plate (6) is mounted between the sound absorbing materials (4) mounted in height direction within the first impedance composite section (21).
4. Impedance composite ventilation muffler according to claim 2, characterized in that the perforation rate of the flow guiding perforated plate (5) is not lower than 20%.
5. Impedance composite ventilation muffler according to claim 1, characterized in that baffles (7) can be added at both ends of the one type of muffler unit (2) and the two type of muffler unit (3) in the direction of the air flow.
6. Impedance composite ventilation muffler according to claim 1, characterized in that a rain protection device (8) can be added at the outlet of the housing (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321300149.2U CN220083302U (en) | 2023-05-26 | 2023-05-26 | Impedance combined type ventilation muffler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321300149.2U CN220083302U (en) | 2023-05-26 | 2023-05-26 | Impedance combined type ventilation muffler |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220083302U true CN220083302U (en) | 2023-11-24 |
Family
ID=88828483
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321300149.2U Active CN220083302U (en) | 2023-05-26 | 2023-05-26 | Impedance combined type ventilation muffler |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220083302U (en) |
-
2023
- 2023-05-26 CN CN202321300149.2U patent/CN220083302U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |