CN204267376U - A kind of low noise distortion snail tongue centrifugal blower - Google Patents
A kind of low noise distortion snail tongue centrifugal blower Download PDFInfo
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- CN204267376U CN204267376U CN201420471405.9U CN201420471405U CN204267376U CN 204267376 U CN204267376 U CN 204267376U CN 201420471405 U CN201420471405 U CN 201420471405U CN 204267376 U CN204267376 U CN 204267376U
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- snail tongue
- spiral case
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- noise
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Abstract
The utility model discloses a kind of low noise distortion snail tongue centrifugal blower, comprise blower fan, spiral case, described assembling is in spiral case, and the snail tongue of described spiral case is non-tilted spatial warping shape.Not only achieve original incline tongue after what the utility model provided make spatial warping by the snail tongue of spiral case from impeller front disc side to the phase difference that hub disk side unsteady interaction produces, the result of the mutual superposition of noise that the unsteady flo w power of out of phase is produced be less than straight snail tongue cophasing unsteady flo w power produce the superposition of noise.And do not change, so avoid the little situation of incline tongue blower pressure coefficient table due to snail tongue and impeller clearance t.
Description
Technical field
The utility model relates to centrifugal blower technical field, is specifically related to a kind of low noise distortion snail tongue centrifugal blower.
Background technique
Air-flow Noise for Blower is primarily of rotational noise and eddy current crack composition.Rotational noise is a kind of Discrete Dipole Approximation.Its frequency is blade passing frequency and harmonic wave thereof, and eddy current crack is a kind of broadband noise, and its frequency spectrum is a wide band continuous spectrum.Therefore rotational noise plays a decisive role.The root that rotational noise produces has 2 points, and one is due to the pressure field on blade and blade along with active wheel rotates, and produces disturbance and produce noise to environment; Two is that impeller outlet exists following wake, and the speed of air-flow and pressure are all uneven, and such airflow function, on spiral case, spiral case just defines pressure pulsation in time and also just creates noise.Due to the nonuniformity of impeller outlet speed and pressure, the interaction of impeller and spiral case snail tongue is a kind of unsteady flo w phenomenon.Impeller and influencing each other of snail tongue cause impeller having unsteady flo w power produce, blade is made to produce rotational noise, conventional spiral case snail tongue is straight snail tongue, as shown in Figure 1, the spiral case snail tongue of current reduction noise is tilting, as shown in Figure 2, it reduces principle of noise is that incline tongue makes to create certain phase difference from impeller front disc side to hub disk side unsteady interaction, the result of the mutual superposition of noise that the unsteady flo w power of out of phase produces must be less than straight snail tongue cophasing unsteady flo w power produce the superposition of noise.But snail tongue make snail tongue and impeller clearance t increase, and clearance t has a significant impact after tilting to fan performance, gap increases can make pressure coefficient reduce.
Model utility content
The technical problem that the utility model mainly solves is to provide a kind of low noise distortion snail tongue centrifugal blower, the snail tongue of spiral case is made spatial warping shape, achieve original incline tongue from impeller front disc side to the phase difference that hub disk side unsteady interaction produces, the result of the mutual superposition of noise that the unsteady flo w power of out of phase is produced be less than straight snail tongue cophasing unsteady flo w power produce the superposition of noise.And do not change, so avoid the little situation of incline tongue blower pressure coefficient table due to snail tongue and impeller clearance t.
For solving the problems of the technologies described above, the technological scheme that the utility model adopts is: provide a kind of low noise distortion snail tongue centrifugal blower, comprise blower fan, spiral case, described assembling is in spiral case, and the snail tongue of described spiral case is spatial warping shape.
The beneficial effects of the utility model are: not only achieve original incline tongue after what the utility model provided make spatial warping by the snail tongue of spiral case from impeller front disc side to the phase difference that hub disk side unsteady interaction produces, the result of the mutual superposition of noise that the unsteady flo w power of out of phase is produced be less than straight snail tongue cophasing unsteady flo w power produce the superposition of noise.And do not change, so avoid the little situation of incline tongue blower pressure coefficient table due to snail tongue and impeller clearance t.
Accompanying drawing explanation
Fig. 1 is the structural representation of conventional spiral case;
Fig. 2 is the structural representation of the spiral case reducing noise;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is the enlarged view of snail tongue wreath piece in the utility model;
Fig. 5 is the aerodynamic parameter table of distortion angle A in the utility model.
In figure: 1, spiral case; 2, snail tongue.
Embodiment
Below in conjunction with embodiment, embodiment of the present utility model is further described.Following examples only for clearly the technical solution of the utility model being described, and can not limit protection domain of the present utility model with this.
As shown in Figure 3 and Figure 4, a kind of low noise distortion snail tongue centrifugal blower, comprise blower fan, spiral case, described assembling is in spiral case, the snail tongue of described spiral case is spatial warping shape, not only achieves original incline tongue from impeller front disc side to the phase difference that hub disk side unsteady interaction produces after the snail tongue of spiral case is made spatial warping, the result of the mutual superposition of noise that the unsteady flo w power of out of phase is produced be less than straight snail tongue cophasing unsteady flo w power produce the superposition of noise.And do not change due to snail tongue and impeller clearance t, so avoid the little situation of incline tongue blower pressure coefficient table, wherein snail tongue size R, L numerical value are determined by the aerodynamics sketch map of blower fan.The angle A of distortion can be chosen by Fig. 5 experience according to aerodynamic parameter.
Claims (1)
1. a low noise distortion snail tongue centrifugal blower, comprises blower fan, spiral case, and described assembling, in spiral case, is characterized in that: the snail tongue spatial warping shape of described spiral case, between snail tongue with snail box-shrouded impeller, clearance t is equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420471405.9U CN204267376U (en) | 2014-08-18 | 2014-08-18 | A kind of low noise distortion snail tongue centrifugal blower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420471405.9U CN204267376U (en) | 2014-08-18 | 2014-08-18 | A kind of low noise distortion snail tongue centrifugal blower |
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| Publication Number | Publication Date |
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| CN204267376U true CN204267376U (en) | 2015-04-15 |
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| CN201420471405.9U Active CN204267376U (en) | 2014-08-18 | 2014-08-18 | A kind of low noise distortion snail tongue centrifugal blower |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221484A (en) * | 2015-09-21 | 2016-01-06 | 联想(北京)有限公司 | Radiation fan |
| CN107850084A (en) * | 2015-08-06 | 2018-03-27 | 三菱电机株式会社 | Centrifugal blower, conditioner and refrigerating circulatory device |
| CN111521365A (en) * | 2020-05-18 | 2020-08-11 | 南京航空航天大学 | Adjustable frequency and phase unsteady flow control experimental device based on rotary slot grating |
-
2014
- 2014-08-18 CN CN201420471405.9U patent/CN204267376U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107850084A (en) * | 2015-08-06 | 2018-03-27 | 三菱电机株式会社 | Centrifugal blower, conditioner and refrigerating circulatory device |
| US10718351B2 (en) | 2015-08-06 | 2020-07-21 | Mitsubishi Electric Corporation | Centrifugal blower, air conditioning apparatus, and refrigerating cycle apparatus |
| CN105221484A (en) * | 2015-09-21 | 2016-01-06 | 联想(北京)有限公司 | Radiation fan |
| CN111521365A (en) * | 2020-05-18 | 2020-08-11 | 南京航空航天大学 | Adjustable frequency and phase unsteady flow control experimental device based on rotary slot grating |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |