CN113007143A - Ultra-low noise silencer for air inlet end of fan - Google Patents
Ultra-low noise silencer for air inlet end of fan Download PDFInfo
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- CN113007143A CN113007143A CN202110327254.4A CN202110327254A CN113007143A CN 113007143 A CN113007143 A CN 113007143A CN 202110327254 A CN202110327254 A CN 202110327254A CN 113007143 A CN113007143 A CN 113007143A
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- conical
- air inlet
- conical inner
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- inlet end
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
- F04D29/664—Sound attenuation by means of sound absorbing material
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- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an ultralow-noise silencer for an air inlet end of a fan, which comprises a conical outer barrel and a conical inner barrel, wherein the conical outer barrel and the conical inner barrel are respectively provided with a wide end and a narrow end; the conical inner cylinder consists of a perforated screen plate on the outer surface and centrifugal glass wool filled in the perforated screen plate. The silencer adopts a narrow rectangular channel with a larger sound absorption material veneer, the structure has the characteristics of wide silencing frequency band, high medium-high frequency silencing quantity, small resistance, suitability for large flow and the like, has relatively ideal silencing effect in a wider frequency band, and can reduce the comprehensive noise reduction effect to be below 80dB (A) under the condition of matching use; in addition, the silencer has good aerodynamic characteristics and low resistance loss.
Description
Technical Field
The invention relates to the field of fan silencing equipment, in particular to an ultra-low noise silencer at an air inlet end of a fan.
Background
A local ventilator (local fan for short) for mining is used for conveying fresh air for ventilation of a mine, and has high rotating speed, and an air inlet and an air outlet are communicated with the atmosphere, so that the radiated rotating noise and eddy current noise are high, the physical and psychological health of workers is seriously influenced, and the mutual communication among the workers is also influenced. And then need set up the muffler at fan air inlet end to reduce the noise. However, the noise reduction effect of the local fan silencer in the market is general, the volume is heavy, and improvement is urgently needed.
Therefore, a large amount of analysis and research are carried out on the local ventilator for the mine, and on the basis of the design of the comprehensive domestic and foreign mufflers, the mufflers with good muffling performance and small fluid resistance are developed through repeated test comparison and screening according to the noise characteristics of the domestic axial-flow ventilator, so that the optimal muffling requirement of the ventilator with large air volume is met.
Disclosure of Invention
The invention aims to provide an ultra-low noise silencer at an air inlet end of a fan, which overcomes the defects of common noise reduction effect and heavy volume of the existing local fan silencer.
The invention realizes the purpose through the following technical scheme:
an ultralow-noise silencer for an air inlet end of a fan comprises a conical outer barrel and a conical inner barrel, wherein the conical outer barrel and the conical inner barrel are respectively provided with a wide end and a narrow end, the conical outer barrel is positioned outside the conical inner barrel, the wide end of the conical outer barrel is connected with the wide end of the conical inner barrel through a plurality of connecting plates, an air inlet is formed at the interval of each connecting plate, a silencing channel is formed in a gap between the conical outer barrel and the conical inner barrel, and an air outlet is formed at the narrow end of the conical outer barrel;
the conical inner cylinder consists of a perforated screen plate on the outer surface and centrifugal glass wool filled in the perforated screen plate.
The further improvement is that the cylinder wall of the conical outer cylinder consists of an outer shell, an inner perforated screen plate and centrifugal glass wool filled between the outer shell and the inner perforated screen plate.
The further improvement lies in that the flow area of the silencing channel is gradually reduced from the air inlet to the air outlet.
The further improvement lies in that the narrow end position of the conical inner cylinder is detachably connected with a cover plate through a bolt.
The further improvement lies in that a plurality of supporting plates are arranged in the silencing channel and are used for connecting and supporting the conical outer cylinder and the conical inner cylinder.
In a further improvement, the silencing passage is a narrow rectangular passage.
The invention has the beneficial effects that: the silencer adopts a narrow rectangular channel with a larger sound absorption material veneer, the structure has the characteristics of wide silencing frequency band, high medium-high frequency silencing quantity, small resistance, suitability for large flow and the like, has relatively ideal silencing effect in a wider frequency band, and can reduce the comprehensive noise reduction effect to be below 80dB (A) under the condition of matching use; in addition, the silencer has good aerodynamic characteristics and low resistance loss, and is simple in structure, small in size, light in weight, convenient to install and durable.
Drawings
FIG. 1 is a schematic external view of the present invention;
FIG. 2 is a schematic cross-sectional view of the present invention;
in the figure: 1. a tapered outer barrel; 2. a conical inner cylinder; 21. perforating a screen plate; 22. centrifuging the glass wool; 23. a cover plate; 3. a connecting plate; 4. an air inlet; 5. a sound deadening passage; 6. an air outlet; 7. a protective net; 8. butting flanges; 9. and a support plate.
Detailed Description
The present application will now be described in further detail with reference to the drawings, it should be noted that the following detailed description is given for illustrative purposes only and is not to be construed as limiting the scope of the present application, as those skilled in the art will be able to make numerous insubstantial modifications and adaptations to the present application based on the above disclosure.
As shown in the combined drawings 1 and 2, the ultralow noise silencer for the air inlet end of the fan comprises a conical outer barrel 1 and a conical inner barrel 2, wherein the conical outer barrel 1 and the conical inner barrel 2 are respectively provided with a wide end and a narrow end, the radius of each wide end is larger than that of each narrow end, the conical outer barrel 1 is of a hollow structure, the conical outer barrel 1 is positioned outside the conical inner barrel 2, the wide end of the conical outer barrel 1 is connected with the wide end of the conical inner barrel 2 through a plurality of connecting plates 3, the spacing parts of the connecting plates 3 form an air inlet 4, a silencing passage 5 is formed in a gap between the conical outer barrel 1 and the conical inner barrel 2, and an air outlet 6 is formed at the narrow end of the conical.
The conical inner cylinder 2 is composed of a perforated screen 21 on the outer surface and centrifugal glass wool 22 filled in the perforated screen 21. The wall of the conical outer cylinder 1 consists of an outer shell, an inner perforated screen plate and centrifugal glass wool filled between the outer shell and the inner perforated screen plate. The centrifugal glass wool is a filamentous material prepared by performing fiberization spraying on glass in a molten state by a centrifugal blowing process and thermosetting resin, has the advantages of flame retardance, no toxicity, corrosion resistance, small volume weight, low heat conductivity coefficient, strong chemical stability, low moisture absorption rate, good hydrophobicity and the like, and has remarkable sound absorption and noise reduction effects. A narrow rectangular channel with a large sound absorption material veneer is formed between the conical outer cylinder 1 and the conical inner cylinder 2, and the structure has the characteristics of wide sound absorption frequency band, high medium-high frequency sound absorption amount, small resistance, suitability for large flow and the like.
The ultra-low noise silencer at the air inlet end of the fan can normally work under the following conditions:
firstly, a silencer is selected and must be matched according to air quantity, and the applicable air quantity of the silencer cannot be smaller than the rated air quantity of a fan;
the use temperature is as follows: less than or equal to 200 ℃;
③ relative humidity: not more than 95 plus or minus 3 percent (at the temperature of +25 ℃);
and fourthly, atmospheric pressure: (80-106) kPa;
working in the underground coal mine with methane and coal dust explosive gas;
sixthly, the ventilation medium cannot contain corrosive substances, water vapor and oil mist;
the dust content should be less than 150mg/m3(subject).
In addition, the design of the ultra-low noise silencer at the air inlet end of the fan meets JB/T6891-2004 technical conditions for silencers for fans and GB/T17-88 design specifications for steel structures. The noise elimination amount is more than or equal to 25dB (A), the noise of the equipment can be effectively reduced under the condition of matching with the mining explosion-proof press-in type disrotatory axial flow local fan with an air inlet silencer and an air outlet silencer, and the comprehensive noise reduction effect can be reduced to be below 80dB (A).
In the invention, the protective net 7 is arranged at the position of the air inlet 4, so that the foreign matters can be effectively prevented from being sucked, and the protective net 7 can be made of stainless steel mesh, aluminum alloy mesh and other materials.
In the invention, the air outlet 6 is provided with a butt flange 8 for connecting the silencer with other equipment, such as an air inlet silencer. The size of the counterflange 8 can be customized to fit the local ventilator.
In the invention, the flow area of the silencing channel 5 is gradually reduced from the air inlet 4 to the air outlet 6, and the silencing channel has good aerodynamic characteristics, so that sound waves can be favorably contacted with and absorbed by sound absorption material veneers of the conical outer cylinder 1 and the conical inner cylinder 2.
In the invention, the narrow end position of the conical inner cylinder 2 is detachably connected with a cover plate 23 through a bolt, the cover plate 23 is used for opening and filling the centrifugal glass wool 22 into the conical inner cylinder 2, and the conical inner cylinder can also be used for maintenance in later use.
In the invention, a plurality of support plates 9 are arranged in the silencing passage 5 and are used for connecting and supporting the conical outer cylinder 1 and the conical inner cylinder 2, and the support plates 9 adopt a flat structure to reduce wind resistance.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (6)
1. The utility model provides a fan air inlet end ultra-low noise silencer which characterized in that: the air conditioner comprises a conical outer cylinder (1) and a conical inner cylinder (2), wherein the conical outer cylinder (1) and the conical inner cylinder (2) are respectively provided with a wide end and a narrow end, the conical outer cylinder (1) is positioned outside the conical inner cylinder (2), the wide end of the conical outer cylinder (1) is connected with the wide end of the conical inner cylinder (2) through a plurality of connecting plates (3), air inlets (4) are formed at intervals of the connecting plates (3), a silencing channel (5) is formed in a gap between the conical outer cylinder (1) and the conical inner cylinder (2), and an air outlet (6) is formed at the narrow end of the conical outer cylinder (1);
the conical inner cylinder (2) is composed of a perforated screen plate (21) on the outer surface and centrifugal glass wool (22) filled in the perforated screen plate (21).
2. The ultra-low noise silencer of the air inlet end of the fan according to claim 1, characterized in that: the wall of the conical outer cylinder (1) consists of an outer shell, an inner perforated screen plate and centrifugal glass wool filled between the outer shell and the inner perforated screen plate.
3. The ultra-low noise silencer of the air inlet end of the fan according to claim 1, characterized in that: the flow area of the silencing passage (5) is gradually reduced from the air inlet (4) to the air outlet (6).
4. The ultra-low noise silencer of the air inlet end of the fan according to claim 1, characterized in that: the narrow end position of the conical inner cylinder (2) is detachably connected with a cover plate (23) through a bolt.
5. The ultra-low noise silencer of the air inlet end of the fan according to claim 1, characterized in that: and a plurality of supporting plates (9) are arranged in the silencing channel (5) and are used for connecting and supporting the conical outer cylinder (1) and the conical inner cylinder (2).
6. The ultra-low noise silencer of the air inlet end of the fan according to claim 1, characterized in that: the silencing passage (5) adopts a narrow rectangular passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110327254.4A CN113007143A (en) | 2021-03-26 | 2021-03-26 | Ultra-low noise silencer for air inlet end of fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110327254.4A CN113007143A (en) | 2021-03-26 | 2021-03-26 | Ultra-low noise silencer for air inlet end of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113007143A true CN113007143A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110327254.4A Pending CN113007143A (en) | 2021-03-26 | 2021-03-26 | Ultra-low noise silencer for air inlet end of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113007143A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412840A (en) * | 2021-12-31 | 2022-04-29 | 中国航空工业集团公司西安飞机设计研究所 | Combined type fan inlet silencer with low flow resistance and large noise reduction amount |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3508838A (en) * | 1968-09-16 | 1970-04-28 | Gen Electric | Sound suppression of compressors used in gas turbine engines |
| CN2567385Y (en) * | 2002-08-30 | 2003-08-20 | 天津市通风机厂 | Pressure return type intake noise silencer |
| CN103644132A (en) * | 2013-12-26 | 2014-03-19 | 山西巨龙风机有限公司 | Mining local ventilation machine with detachable plastic structure |
| CN105402170A (en) * | 2015-11-25 | 2016-03-16 | 平安电气股份有限公司 | Air inlet silencer for local ventilator |
| CN207634400U (en) * | 2017-12-13 | 2018-07-20 | 卧龙电气集团股份有限公司 | Booster noise reduction end shield |
| CN208184768U (en) * | 2018-04-23 | 2018-12-04 | 安徽新园矿山设备制造有限责任公司 | A kind of portable blower conical flow guiding silencing means |
| CN212615643U (en) * | 2020-07-23 | 2021-02-26 | 平安电气股份有限公司 | Radial two-side multi-channel air inlet and outlet silencer |
-
2021
- 2021-03-26 CN CN202110327254.4A patent/CN113007143A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3508838A (en) * | 1968-09-16 | 1970-04-28 | Gen Electric | Sound suppression of compressors used in gas turbine engines |
| CN2567385Y (en) * | 2002-08-30 | 2003-08-20 | 天津市通风机厂 | Pressure return type intake noise silencer |
| CN103644132A (en) * | 2013-12-26 | 2014-03-19 | 山西巨龙风机有限公司 | Mining local ventilation machine with detachable plastic structure |
| CN105402170A (en) * | 2015-11-25 | 2016-03-16 | 平安电气股份有限公司 | Air inlet silencer for local ventilator |
| CN207634400U (en) * | 2017-12-13 | 2018-07-20 | 卧龙电气集团股份有限公司 | Booster noise reduction end shield |
| CN208184768U (en) * | 2018-04-23 | 2018-12-04 | 安徽新园矿山设备制造有限责任公司 | A kind of portable blower conical flow guiding silencing means |
| CN212615643U (en) * | 2020-07-23 | 2021-02-26 | 平安电气股份有限公司 | Radial two-side multi-channel air inlet and outlet silencer |
Non-Patent Citations (1)
| Title |
|---|
| 蒋泽汉: "《复合材料及其装饰施工技术》", 31 January 1999 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114412840A (en) * | 2021-12-31 | 2022-04-29 | 中国航空工业集团公司西安飞机设计研究所 | Combined type fan inlet silencer with low flow resistance and large noise reduction amount |
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Application publication date: 20210622 |
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