CN215058481U - 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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- CN215058481U CN215058481U CN202120636810.1U CN202120636810U CN215058481U CN 215058481 U CN215058481 U CN 215058481U CN 202120636810 U CN202120636810 U CN 202120636810U CN 215058481 U CN215058481 U CN 215058481U
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Abstract
The utility model discloses a fan air inlet end ultra-low noise silencer, which comprises a conical outer barrel and a conical inner barrel, wherein the conical outer barrel and the conical inner barrel are both 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, the interval of each connecting plate forms an air inlet, a silencing channel is formed in the gap between the conical outer barrel and the conical inner barrel, and the narrow end of the conical outer barrel forms an air outlet; 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; the silencer also has good aerodynamic properties and low drag losses.
Description
Technical Field
The utility model relates to a fan amortization equipment field, concretely relates to fan air inlet end ultra-low noise silencer.
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.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a fan air inlet end ultra-low noise silencer, it has solved the defect that current office fan silencer noise reduction effect is general, and the volume is heavy.
The utility model discloses a following technical scheme realizes above-mentioned purpose:
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, an air outlet is formed at the narrow end of the conical outer barrel, a protective net is arranged at the position of the air inlet, and a butt flange is arranged at the position of the air outlet;
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 beneficial effects of the utility model reside in 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 structural view of the present invention;
fig. 2 is a schematic sectional structure 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 outer barrel 1.
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).
The utility model discloses in, the position of air intake 4 is equipped with protection network 7, can effectively prevent to inhale external foreign matter, and protection network 7 can adopt materials such as stainless steel net, aluminum alloy net.
The utility model discloses in, the position of air outlet 6 is equipped with flange 8 for the muffler is connected with other equipment, for example with being connected of air inlet silencer. The size of the counterflange 8 can be customized to fit the local ventilator.
The utility model discloses in, amortization passageway 5 is dwindled by air intake 4 toward 6 flow area of air outlet gradually, and it has good aerodynamic characteristic, is favorable to the sound wave to be absorbed with the acoustic absorbent veneer contact of toper urceolus 1 and toper inner tube 2.
The utility model discloses in, the narrow end position of toper inner tube 2 can be dismantled through the bolt and be connected with apron 23, and apron 23 is used for opening and to the inside centrifugal glass cotton 22 that fills of toper inner tube 2, maintenance when also can be used to the later stage and use.
The utility model discloses in, be equipped with a plurality of backup pads 9 in the amortization passageway 5 for connect and support toper urceolus 1 and toper inner tube 2, backup pad 9 adopts flat structure, in order to reduce the windage.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are 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 noise reduction device 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 noise reduction channel (5) is formed in a gap between the conical outer cylinder (1) and the conical inner cylinder (2), an air outlet (6) is formed at the narrow end of the conical outer cylinder (1), a protective net (7) is arranged at the position of the air inlet (4), and a butt flange (8) is arranged at the position of the air outlet (6);
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 |
|---|---|---|---|
| CN202120636810.1U CN215058481U (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 |
|---|---|---|---|
| CN202120636810.1U CN215058481U (en) | 2021-03-26 | 2021-03-26 | Ultra-low noise silencer for air inlet end of fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215058481U true CN215058481U (en) | 2021-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120636810.1U Active CN215058481U (en) | 2021-03-26 | 2021-03-26 | Ultra-low noise silencer for air inlet end of fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215058481U (en) |
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2021
- 2021-03-26 CN CN202120636810.1U patent/CN215058481U/en active Active
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