CN2695702Y - Silencer for axial fan - Google Patents
Silencer for axial fan Download PDFInfo
- Publication number
- CN2695702Y CN2695702Y CN 200420025341 CN200420025341U CN2695702Y CN 2695702 Y CN2695702 Y CN 2695702Y CN 200420025341 CN200420025341 CN 200420025341 CN 200420025341 U CN200420025341 U CN 200420025341U CN 2695702 Y CN2695702 Y CN 2695702Y
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- sound absorbing
- sound
- sound absorption
- absorbing material
- cone
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Abstract
The utility model relates to a silencer for axial fan of the craft. The silencer for axial fan of the craft is a wind silencer which is adapted for the axial fan of the craft and used in the environment with smaller space. The silencer is composed of a sound absorbing blast barrel (1) and a sound absorbing conical body (2). The sound absorbing blast barrel is a hollow round tube shape. The big end of the cone of the sound absorbing conical body is arranged on one end of the air inlet which is arranged on the outside of the sound absorbing barrel, and remains a definite distance with the sound absorbing blast barrel to form a round of air inlet (3). The small end of the cone is arranged in the sound absorbing barrel. The sound absorbing blast barrel and the sound absorbing conical body are arranged on the same shaft line. The sound absorbing blast barrel is composed of an outer shell (11) and the sound absorbing material (12). The sound absorbing material (12) is arranged in the inner side of the outer shell (11). The inner wall of the outer sound absorbing barrel of the air inlet is arc shape. The sound absorbing conical body is composed of the sound absorbing material (21), a bracing frame (22) and a facing plate (23). The interior of the facing plate is provided with the sound absorbing material and the bracing frame. A conical surface (24) is in parabola form. The silencer has simple structure, small volume, light weight, small resistance loss and good effect.
Description
Technical field
The utility model relates to a kind of silencing apparatus, particularly a kind of be applicable to boats and ships with axial-flow blower and space than the blower fan silencing apparatus that uses in the microhabitat.
Background technique
Ship Building and Repairing enterprise uses a large amount of aerodynamic force equipment such as axial-flow blower in process of production, and axial-flow blower running noises has in use had a strong impact on staff's hearing health and safety production up to 115dB (A).For reducing noise pollution, increase work efficiency, the protection staff's is healthy, is very necessary for axial-flow blower is equipped with a silencing apparatus.
Silencing apparatus is a kind of device that can allow air communication cross and make the decay of noise energy in the air-flow, is installed in the pipeline that air communication crosses or the inlet and outlet mouth of pipe.Mainly divide resistive and resistance two major types by noise elimination mechanism classification silencing apparatus, but at distinct device, dissipative muffler and reactive muffler each have various structural type again.Dissipative muffler be with sound-absorbing porous material as sound absorbent, when air-flow between sound absorbent through out-of-date, the noise energy in the air-flow is absorbed effectively, thereby has reduced the noise into and out of the air port.General dissipative muffler centering high-frequency air flow noise is comparatively suitable, generally about 10dB/ rice, this is relevant with the drag losses that requires with the noise frequency height in the air-flow for its sound deadening capacity, and frequency is high more, sound deadening capacity is big more, and the big more sound deadening capacity of the drag losses of permission is also big more.Reactive muffler is that the reflection, interference, the resonance that utilize sound wave consume noise energy, and it does not need sound-absorbing material, but its sound deadening capacity is less relatively, and drag losses is very big, and more is applicable to low-frequency noise is controlled.
The silencing apparatus of which kind of type, which kind of structure no matter, the quality of its performance is mainly determined by the following aspects: the first, it is big that sound deadening capacity is wanted; The second, little to the drag losses of air-flow; The 3rd, the volume of silencing apparatus is little; The 4th, it is high that the cost performance of use is wanted; The 5th with Environmental Conditions with use technology to adapt.
Summary of the invention
Technical problem: the utility model silencing apparatus is at axial-flow blower running noises height peculiar to vessel, the cabin space is little, the roving characteristics of blower fan design, provide a kind of acoustic wave filter structure simple, little in light weight, the axial-flow blower silencing apparatus peculiar to vessel that drag losses is little, effective of volume.
Technological scheme: axial-flow blower silencing apparatus of the present utility model, made by sound absorbing material, this silencing apparatus is made of sound absorption air duct and sound absorption cone; The sound absorption air duct is the pipe shape of a logical heart, the major part of circular cone is positioned at outer intake grill one end of sound absorption tube in the sound absorption cone, and and sound absorption tube wind between leave certain distance and form a circle intake grill, the microcephaly of this circular cone is positioned at the sound absorption tube, sound absorption air duct and sound absorption cone are positioned on same the axis.
The sound absorption air duct is made up of shell and sound-absorbing material, and sound-absorbing material is positioned at the inboard of shell, and the inwall of the tube that absorbs sound outside intake grill is a camber line shape.The sound absorption cone is made up of sound-absorbing material, supporting frame, protection slab, is provided with sound-absorbing material and supporting frame in the inside of protection slab, and the conical surface is parabolic shape.
Beneficial effect: the utility model is compared with common dissipative muffler and mainly is to have done improvement on the project organization, and be specially: one, the air intake passage of silencing apparatus is designed to camber line shape, and this can increase the sound deadening capacity of silencing apparatus, can reduce drag losses simultaneously; Two, the conical surface of this silencing apparatus sound absorbent is parabolic shape, the thickness of sound absorbent is gradually changed, because for sound-absorbing porous material, the amassing of the thickness of sound absorbent and its first resonant frequency is a constant, this has just enlarged the sound sucting band width of silencing apparatus, thereby has improved the noise elimination effect.Can regulate the distance of sound absorption tube and sound absorption cone according to the requirement of concrete sound deadening capacity and the restriction of drag losses, make silencing apparatus have more practicability.
The utility model axial-flow blower acoustic wave filter structure is more succinct, has the streamline sense; Volume is little, in light weight, consumptive material is few; Silencing apparatus frequency of noise elimination scope is big; The unit length sound deadening capacity is 2-3 a times of general dissipative muffler.
Description of drawings
Fig. 1 is the utility model axial-flow blower acoustic wave filter structure schematic representation.Sound absorption air duct 1, sound absorption cone 2, intake grill 3, shell 11, sound-absorbing material 12, sound-absorbing material 21, supporting frame 22, protection slab 23, the conical surface 24 are wherein arranged.
Fig. 2 be among Fig. 1 I-I to sectional drawing.
Embodiment
According to the actual use present situation of Ship Building and Repairing enterprise manufacturing shop axial-flow blower, require the length of silencing apparatus and length that width all must not exceed axial-flow blower and wide, i.e. 600mm is so that frequently move and be shifted; The frequency of noise elimination of design will be fit to the main frequency range of axial-flow blower; Total sound deadening capacity will reach 15 decibels.
Axial-flow blower silencing apparatus of the present utility model is made of sound absorption air duct 1 and sound absorption cone 2; Sound absorption air duct 1 is the pipe shape of a logical heart, the major part of circular cone is positioned at intake grill one end outside the sound absorption tube 1 in the sound absorption cone 2, and and sound absorption tube wind 1 between leave certain distance and form a circle intake grill 3, the microcephaly of this circular cone is positioned at sound absorption tube 1, and sound absorption air duct 1 and sound absorption cone 2 are positioned on same the axis.Sound absorption air duct 1 is made up of shell 11 and sound-absorbing material 12, and sound-absorbing material 12 is positioned at the inboard of shell 11, and the inwall of sound absorption tube 1 is a camber line shape outside intake grill 3.Sound absorption cone 2 is made up of sound-absorbing material 21, supporting frame 22, protection slab 23, is provided with sound-absorbing material 21 and supporting frame 22 in the inside of protection slab 23, and the conical surface 24 is parabolic shape.
The structure of this silencing apparatus as shown in Figure 1, its mainly by the sound absorption air duct and the sound absorption cone form, form air intake passage between the two.Intake grill is positioned at the side, and exhaust outlet and axial-flow blower join.
When original air-flow entered the blower fan mouth, the fan noise reverse radiation was in external environmemt.Add after this silencing apparatus that air-flow still can enter along the silencing apparatus air inlet duct, but the fan operation noise only passes through the outside environmental dissemination of air inlet duct of silencing apparatus.Because be sound absorbent around the air inlet duct, acoustic energy is absorbed in air intake passage in a large number, thereby has reduced the air inlet noise.
Both made respectively when the utility model silencing apparatus was made, and with band iron both were connected into integral body then.According to the air output and the selected airspeed of axial-flow blower, determine the sectional area of air inlet duct, determine the total length of silencing apparatus according to the requirement of sound deadening capacity.
By this axial-flow blower silencing apparatus in certain shipyard design, long 500mm, diameter 600mm, the sound deadening capacity of silencing apparatus (transmission loss) they are 17dB (A).
Claims (3)
1, a kind of axial-flow blower silencing apparatus is made up of the sound absorbing material structural member, it is characterized in that this silencing apparatus is made of sound absorption air duct (1) and sound absorption cone (2); Sound absorption air duct (1) is the pipe shape of a logical heart, the major part of circular cone is positioned at outer intake grill one end of sound absorption tube (1) in the sound absorption cone (2), and and sound absorption tube wind (1) between leave certain distance and form a circle intake grill (3), the microcephaly of this circular cone is positioned at sound absorption tube (1), and sound absorption air duct (1) and sound absorption cone (2) are positioned on same the axis.
2, axial-flow blower silencing apparatus according to claim 1, the air duct (1) that it is characterized in that absorbing sound is made up of shell (11) and sound-absorbing material (12), sound-absorbing material (12) is positioned at the inboard of shell (11), and the inwall of sound absorption tube (1) is a camber line shape outside intake grill (3).
3, axial-flow blower silencing apparatus according to claim 1, the cone (2) that it is characterized in that absorbing sound is made up of sound-absorbing material (21), supporting frame (22), protection slab (23), be provided with sound-absorbing material (21) and supporting frame (22) in the inside of protection slab (23), the conical surface (24) is parabolic shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025341 CN2695702Y (en) | 2004-03-12 | 2004-03-12 | Silencer for axial fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420025341 CN2695702Y (en) | 2004-03-12 | 2004-03-12 | Silencer for axial fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2695702Y true CN2695702Y (en) | 2005-04-27 |
Family
ID=34770936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420025341 Expired - Fee Related CN2695702Y (en) | 2004-03-12 | 2004-03-12 | Silencer for axial fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2695702Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345646A (en) * | 2011-07-19 | 2012-02-08 | 平安电气股份有限公司 | External taper cylinder muffler for mine ventilator |
| CN102536917A (en) * | 2011-07-19 | 2012-07-04 | 平安电气股份有限公司 | Internal conical barrel muffler for mining fan |
| CN105090130A (en) * | 2014-05-13 | 2015-11-25 | 枣庄福德通用机械有限公司 | External diameter air intake noise reduction mechanism for axial flow fan |
| CN105864109A (en) * | 2015-01-22 | 2016-08-17 | 中国科学院声学研究所 | Silencer for axial flow fan air inlet |
| CN106322474A (en) * | 2016-08-28 | 2017-01-11 | 杭州老板电器股份有限公司 | Flow-guiding, sound-absorbing and three-dimensional noise-reducing system of kitchen ventilator |
| CN106683660A (en) * | 2016-12-15 | 2017-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Low flow resistance noise elimination exhaust apparatus |
| CN108547798A (en) * | 2018-04-30 | 2018-09-18 | 许彐琼 | Fan |
| CN113936630A (en) * | 2020-06-29 | 2022-01-14 | 中兴通讯股份有限公司 | Noise elimination unit and honeycomb type noise eliminator |
| CN117329173A (en) * | 2023-12-01 | 2024-01-02 | 南京磁谷科技股份有限公司 | Air inlet noise reduction device of high-speed centrifugal compressor |
-
2004
- 2004-03-12 CN CN 200420025341 patent/CN2695702Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345646A (en) * | 2011-07-19 | 2012-02-08 | 平安电气股份有限公司 | External taper cylinder muffler for mine ventilator |
| CN102536917A (en) * | 2011-07-19 | 2012-07-04 | 平安电气股份有限公司 | Internal conical barrel muffler for mining fan |
| CN105090130A (en) * | 2014-05-13 | 2015-11-25 | 枣庄福德通用机械有限公司 | External diameter air intake noise reduction mechanism for axial flow fan |
| CN105864109A (en) * | 2015-01-22 | 2016-08-17 | 中国科学院声学研究所 | Silencer for axial flow fan air inlet |
| CN105864109B (en) * | 2015-01-22 | 2018-08-07 | 中国科学院声学研究所 | A kind of axial flow blower air inlet silencer |
| CN106322474A (en) * | 2016-08-28 | 2017-01-11 | 杭州老板电器股份有限公司 | Flow-guiding, sound-absorbing and three-dimensional noise-reducing system of kitchen ventilator |
| CN106683660A (en) * | 2016-12-15 | 2017-05-17 | 中国航空工业集团公司西安飞机设计研究所 | Low flow resistance noise elimination exhaust apparatus |
| CN108547798A (en) * | 2018-04-30 | 2018-09-18 | 许彐琼 | Fan |
| CN113936630A (en) * | 2020-06-29 | 2022-01-14 | 中兴通讯股份有限公司 | Noise elimination unit and honeycomb type noise eliminator |
| CN117329173A (en) * | 2023-12-01 | 2024-01-02 | 南京磁谷科技股份有限公司 | Air inlet noise reduction device of high-speed centrifugal compressor |
| CN117329173B (en) * | 2023-12-01 | 2024-04-12 | 南京磁谷科技股份有限公司 | Air inlet noise reduction device of high-speed centrifugal compressor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |