CN203051232U - Shell of low noise axial flow fan - Google Patents
Shell of low noise axial flow fan Download PDFInfo
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- CN203051232U CN203051232U CN 201320004718 CN201320004718U CN203051232U CN 203051232 U CN203051232 U CN 203051232U CN 201320004718 CN201320004718 CN 201320004718 CN 201320004718 U CN201320004718 U CN 201320004718U CN 203051232 U CN203051232 U CN 203051232U
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- shell
- casing
- noise
- low noise
- sound absorption
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Abstract
The utility model discloses a shell of a low noise axial flow fan, and belongs to the technical field of turbine noise reduction. The shell of the low noise axial flow fan is composed of a shell inner layer, inner layer sound absorption plaster materials, a metal foam aluminum plate, outer layer sound absorption plaster materials and a shell outer layer in a composite mode, wherein the shell inner layer, the inner layer sound absorption plaster materials, the metal foam aluminum plate, the outer layer sound absorption plaster materials and the shell outer layer are sequentially arranged from the inner layer of the shell to the outer layer of the shell. The shell of the low noise axial flow fan has the advantages of the metal foam aluminum plate which is light in weight, capable of reducing cavity noise, high-temperature resistant and recoverable, and is high in rigidity and low in manufacturing cost and installation coast. A noise reduction value of the fan is about 18dB. The shell of the low noise axial flow fan is better in sound absorption effect in low and medium frequency ranges and quite remarkable in noise reduction effect, and therefore working environment of operators is improved.
Description
Technical field
The utility model belongs to turbine noise reduction technology field.Being particularly related to a kind of casing for reducing the axial-flow blower noise, is the casing that adopts the metal foamed aluminium plate structure specifically.
Background technique
In the axial-flow blower running, can produce aerodynamic noises such as rotational noise and eddy current crack and mechanical noise etc., its noise is broadband noise, and scope is between 35dB～120dB.Noise pollution all constitutes serious harm to people, animal, instrument and apparatus and building, the noise level limit of the job site in country has issued and implemented " industrial and mining enterprise's noise sanitary standard " and " urban environment noise pollution prevention ordinance " strict regulations in succession workshop of industrial enterprise and operation place.Therefore, from saving cost, reduce fan noise and pollute, improve the angle of staff's working environment and consider that designing and develop a kind of low noise axial fan casing has very important meaning.
At present, existing blower fan noise-reduction method focuses mostly in the transformation (importing and exporting installation guide plate etc. at blower fan) of blower fan structure aspect and the improvement (installing galvanized sheet etc. additional in the air inlet both sides) aspect the blower fan sound-absorbing material etc.But many noise-reduction method field conduct more complicated, even relate to the transformation of blower fan important structure (as movable vane blade etc.), cost is higher, and noise reduction is limited, is difficult to realize effective noise reduction of blower fan.
The model utility content
The purpose of this utility model is to focus mostly in the transformation of blower fan structure aspect at present existing blower fan noise-reduction method, and relate to the field conduct more complicated that the blower fan important structure is transformed, reforming cost is higher, and noise reduction is limited, be difficult to realize the deficiency of effective noise reduction of blower fan, a kind of casing of low noise axial fan is provided, it is characterized in that, the low noise axial fan casing for from the casing internal layer to skin by casing internal layer 1, internal layer sound absorption the wipe one's face material 4 and casing skin 5 is compound successively constitutes of material 2, metal foamed aluminium board 3, outer sound absorption of wiping one's face.
Described casing internal layer and casing skin are made by corrosion resistant plate or steel plate.
Adopt straight tenon 6 to be connected with straight trough 7 between described each metal foamed aluminium board, and be connected with the inside and outside layer of fan casing by rivet.
The beneficial effects of the utility model have provided a kind of simple in structure, easy construction, the good low noise casing of noise reduction, have the advantages that quality is light, reduce the metal foamed aluminium board of cavity noise, high temperature resistant, recyclable utilization, and itself having higher rigidity, making and installation cost are low.This casing compared with prior art, the fan noise reduction is worth about 18 dB, and is better at the acoustically effective of medium and low frequency scope, the noise reduction highly significant, thereby improved operations staff's working environment.
Description of drawings
Fig. 1 low noise axial fan casing structure schematic representation.
Fig. 2 low noise axial fan casing partial structurtes schematic representation.
Embodiment
The utility model provides a kind of casing of low noise axial fan.Illustrated below in conjunction with accompanying drawing.
In Fig. 1, low noise axial fan casing structure schematic representation shown in Figure 2, the low noise axial fan casing is by casing internal layer 1, internal layer sound absorption the wipe one's face material 4 and casing skin 5 is compound successively constitutes of material 2, metal foamed aluminium board 3, outer sound absorption of wiping one's face; Wherein, casing internal layer 1 is welded by corrosion resistant plate or steel plate, the internal layer that lays a bed thickness 10mm between casing internal layer 1 steel plate and metal foamed aluminium board 3 absorbs sound to wipe one's face and expects 2, for reducing the mechanical vibration noise between fan casing internal layer 1 steel plate and the metal foamed aluminium board 3, simultaneously medium and low frequency all there is good acoustically effective to the various noises of high frequency.Fan casing outer 5 adopts corrosion resistant plate or steel plate to weld, and adopts the outer sound absorption of 10mm to wipe one's face between the metal foamed aluminium board 3 equally and expect filling, and the bottom is fixed on the cement pedestal on ground.The low noise casing edge that casing is divided into afflux district (I), movable vane district (II), stator blade district (III) and diffusion district four regional zoness of different such as (IV) arranges outwardly directed bolt, is used for the connection of different parts, is convenient to dismounting.Adopt straight tenon 6 to be connected with straight trough 7 between each metal foamed aluminium board, and be connected with the inside and outside layer of fan casing by rivet.Above-mentioned metal foamed aluminium board is the silk screen handing-over, is the aluminium sheet of irregular through hole, and metal foamed aluminium board has the effect that absorbs or offset acoustic wave segment, has good noise reduction, and sound absorption is wiped one's face and expected to have sound insulation function.
After sound wave incided foam metal, acoustic wave segment penetrated the porous structure of metal foamed aluminium board, can cause air particle vibration in the space, thereby because relative movement forms viscous resistance acoustic energy was converted into heat energy between particle, and incident acoustic energy is subdued; Secondly, sound wave makes the air in the pore channel produce compression, expand, and can produce temperature gradient between adjacent compressing area and the breathing space, and heat energy is derived by network-like metal frame, and acoustic energy is subdued; Simultaneously, when sound wave was got back to the surface through sound-absorbing material after rigid plane reflection, further decay again through decay and so forth, had only portion of energy to be delivered in the air, and another part is absorbed, and makes blower fan reach noise reduction.
Embodiment
Measuring point in certain axial-flow blower is carried out noise monitoring, former blower fan plant noise is about 98dB, install the low noise casing additional, the wipe one's face outer making of casing of material and the thick corrosion resistant plate of 10mm or steel plate of this fan casing internal layer adopts that the thick corrosion resistant plate of 10mm or steel plate are made, the thick internal layer sound absorption of 10mm is wiped one's face material, the thick metal foamed aluminium board of 30mm, the sound absorption of 10mm thick outer, the fan noise monitoring shows, fan noise is reduced to 80dB, reduction is worth about 18 dB, the noise reduction highly significant, thus operations staff's working environment improved.
Claims (3)
1. the casing of a low noise axial fan, it is characterized in that the low noise axial fan casing constitutes from the casing internal layer to skin by casing internal layer (1), internal layer sound absorption wipe one's face material (2), metal foamed aluminium board (3), outer material (4) and casing skin (5) the compound formation successively of wiping one's face that absorbs sound.
2. according to the described casing for reducing the axial-flow blower noise of claim 1, it is characterized in that described casing internal layer and casing skin are made by corrosion resistant plate or steel plate.
3. according to the described casing for reducing the axial-flow blower noise of claim 1, it is characterized in that, adopt straight tenon (6) to be connected with straight trough (7) between described each metal foamed aluminium board, and be connected with the inside and outside layer of fan casing by rivet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320004718 CN203051232U (en) | 2013-01-05 | 2013-01-05 | Shell of low noise axial flow fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320004718 CN203051232U (en) | 2013-01-05 | 2013-01-05 | Shell of low noise axial flow fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203051232U true CN203051232U (en) | 2013-07-10 |
Family
ID=48734190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320004718 Expired - Fee Related CN203051232U (en) | 2013-01-05 | 2013-01-05 | Shell of low noise axial flow fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203051232U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032381A (en) * | 2013-01-05 | 2013-04-10 | 华北电力大学（保定） | Enclosure for reducing noise of axial flow fan |
-
2013
- 2013-01-05 CN CN 201320004718 patent/CN203051232U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103032381A (en) * | 2013-01-05 | 2013-04-10 | 华北电力大学（保定） | Enclosure for reducing noise of axial flow fan |
| CN103032381B (en) * | 2013-01-05 | 2015-09-02 | 华北电力大学（保定） | For reducing the casing of noise of axial flow fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130710 Termination date: 20150105 |
|
| EXPY | Termination of patent right or utility model |