CN2075715U

CN2075715U - Energy-saving low-noise axial-flow fan

Info

Publication number: CN2075715U
Application number: CN 90217118
Authority: CN
Inventors: 李耀堂
Original assignee: Seventh Design And Research Institute Of Ministry Of Aeronautics And Astronautics
Current assignee: Seventh Design And Research Institute Of Ministry Of Aeronautics And Astronautics
Priority date: 1990-08-03
Filing date: 1990-08-03
Publication date: 1991-04-24

Abstract

The energy-saving low-noise axial flow fan adopts a cylindrical hub, a high hub ratio, few blades, a wide wing-shaped impeller, a streamline wind collector and a low wind resistance support, the appearance design of the whole fan is novel, the aerodynamic performance is good, compared with a T-35 type axial flow fan, the air quantity is improved by 35-48%, the air pressure is improved by 55-62%, the noise ratio A is reduced by 20.4-22.5 dB , and the energy is saved by 24%.

Description

Energy saving low noise axial-flow blower

The utility model relates to a kind of vented exhaust equipment, refers to the low noise axial fan of a kind of energy-conservation, high hub ratio, wide blade especially.

Along with development and national economy, the raising of people's living standard, also more and more higher to the requirement of ventilation equipment.The T-35 axial-flow blower of China's early eighties development typing, employing garden cylindricality wheel hub, improved the aerodynamic quality of blower fan, but because it still adopts the long narrow blade of old-fashioned strip-type, in the high speed rotating process, the resistance of air-flow in blade passage is big, lift is little, producing strong air flow in blade inlet simultaneously impacts, aerodynamic quality just because of this blade is poor, when fan design, for reaching design air flow and blast, have to improve design speed, and in the blower air kinetic noise, rotational noise is directly proportional with ten powers of active wheel peripheral velocity, eddy current crack is directly proportional with six powers of active wheel peripheral velocity, so the noise of this type blower fan is bigger, generally, can't satisfy " industrial and mining enterprise's noise sanitary standard " of the State Labour Bureau and Ministry of Public Health promulgation in 1980 and " urban environment noise standard " middle high requirement that proposes of nineteen eighty-two promulgation more than 80 decibels.

In view of the problem that above-mentioned prior art exists, the purpose of this utility model provide a kind of aerodynamic quality good, in that remarkable reduction is arranged aspect power consumption and the noise, at the novel axial-flow blower that all improves a lot aspect air quantity, the blast.

Design principle of the present utility model is: have according to scholar gram Paderewski lift theorem and leaf grating aerodynamic force equation:

C _y′b＝ (4πP)/(pZWWmη)

P-blower fan total head in the formula, η-blower fan total pressure efficiency, CY '-lift coefficient, b-blade profile chord length, the Z-number of blade, W-vane angle speed, the average relative of Wm-air-flow.

By following formula as can be known, blower fan total head P is directly proportional with CY ' bZWWm, therefore, adds large leaf type width b, suitably reduces W, can reach air quantity, the blast of design equally.In addition, experimental study shows, selects rational active wheel cascade parameter, also is the key factor that reduces noise, particularly eddy current crack.

Silent ventilator is made up of wheel hub, slip ring, blade, support, motor, casing, the structure shape of blade is roomy symmetrical hollow variable cross section distortion wing blade, the cascade parameter in cross section, impeller outer garden has the minimal noise parameter, for the aerodynamic quality that improves blower fan and reduce the suction port gas-flow resistance, employing garden column type wheel hub, the electric machine support of the streamlined garden of high hub ratio arc wind collecting unit and low windage.

Configuration design novelty of the present utility model, good aerodynamic quality, because the reduction of vane angle speed, the rotational noise and the eddy current crack of blower fan have been reduced greatly, and can obtain obvious energy-saving effect, and air quantity, blast can obtain raising by a relatively large margin, and (DZT60-1, DZT50-1) technical performance with other model axial-flow blower relatively sees table 1 for details to two kinds of models of the present utility model.

(table 1)

Model	Air quantity m/h	Blast Pa	Noise dB (A)	Air quantity compares %	Wind pressure ratio %	Noise ratio dB (A)	Than A sound level dB (A)	Energy-conservation %
									T35.5#a=30 ^o	5235	63.7	80	100	100	-	44.3	0
DZT60-1.5# a=29 ^o	7734	103.0	66	148	162	14	23.9	24
									DZT50-1.5# a=23 ^o	7060	99.0	63	135	155	17	21.8	24

The drawing of accompanying drawing is described as follows:

Fig. 1 is an energy-saving low-noise blower fan structure schematic representation.

Wheel hub (1) adopts cylindrical, hub ratio is 0.5～0.6, slip ring (2) is selected the little garden arc slip ring of resistance for use, and blade (3) is the wing impeller of roomy symmetry machine, and the top of chord of foil is little, following big, the design of leaf grating guarantees that it has the minimal noise parameter, i.e. solidity of blades τ=1.0～1.5, camber f=0.07～0.11 relatively, angle of attack i=0～3 °, β _1A=30 °, average relative thickness C=0.03～0.04, the quantity of blade (3) is 3, and setting angle is 23 °～29 °, and motor (5) is selected low windage YSF serial motors for use, adopts the support (4) and the streamlined housing (6) of low windage.

Claims

1, a kind of energy-saving low-noise axial-flow blower, by wheel hub (1), slip ring (2), blade (3), support (4), motor (5) and casing (6) are formed, and wheel hub (1) adopts cylindrical bosses, high hub ratio.It is characterized in that: the structure shape of blade (3) is roomy symmetrical hollow variable cross section distortion wing blade, and the cascade parameter of impeller outer circular section has the minimal noise parameter.

2, energy-saving low-noise axial-flow blower according to claim 1 is characterized in that: the hub ratio of blower fan is 0.5～0.6.

3, energy-saving low-noise axial-flow blower according to claim 1 and 2 is characterized in that blower fan adopts the electric machine support of streamlined circular arc slip ring and low windage.