CN2046560U

CN2046560U - Centrifugal air machine

Info

Publication number: CN2046560U
Application number: CN 89205659
Authority: CN
Inventors: 杨升沂
Original assignee: XINDIAN AIR-CONDITIONING VENTILATOR FACTORY ZIBO CITY
Current assignee: XINDIAN AIR-CONDITIONING VENTILATOR FACTORY ZIBO CITY
Priority date: 1989-05-20
Filing date: 1989-05-20
Publication date: 1989-10-25

Abstract

The utility model discloses a centrifugal ventilator, which is composed of a rotary electric motor, a forward impeller with a plurality of wings, and a spiral casing. The centrifugal ventilator which is designed on the basis of a centrifugal ventilator whose patent number is 89210936. X is chiefly suitable to be matched with an H50 air-conditioning group and is suitable for other low-noise occasions. The internal diameter d-[1] of the centrifugal ventilator is from 343 mm to 350 mm, and the external diameter d-[2] of the centrifugal ventilator is from 396 mm to 404 mm. The utility model has the advantages of small size and light weight; the noise is lower than 73d B (A); the efficiency reaches to 72%, and the noise of the complete machine which is matched with the air-conditioning group is smaller than 63d B (A).

Description

Centrifugal air machine

The utility model is a kind of low pressure centrifugal fan.

At present, the centrifugal fan that domestic air-conditioning unit is used mainly is to adopt common motor to make the structure of high speed rotating by the belt impeller; Perhaps adopt the direct impeller of common motor main shaft to make the structure of high speed rotating, because project organization itself is limit, its rated flow, total head is difficult to meet the demands, and there is a noise height, efficient is low, volume is big, shortcomings such as installation and maintenance difficulty, especially noise objective does not reach the NBS requirement, the our factory is in order to solve the problem that above-mentioned centrifugal fan exists, design impeller and directly be fixed on evolute motor casing intermediate portion, vane rings is in motor places volute of blower, by support electric machine main shaft is fixed on low noise on the spiral case both ends of the surface, high efficiency, volume is little, installation and maintenance are convenient, the centrifugal fan that life-span is long, and declared patent to Patent Office of the People's Republic of China, its number of patent application is 89210936.X, but because each air-conditioning unit is diversified in specifications, therefore also variant to the requirement of blower fan, need at various unit specific designs.

The purpose of this utility model just provides a kind of for H50 air-conditioning unit or other centrifugal fan that requires low noise environment to use.

Centrifugal fan concrete structure of the present utility model is identical with the 89210936.X of patent applied for, complete machine comprises the evolute motor, forward multiple wing formula impeller and spiral case, impeller 1 directly is fixed on evolute quiet motor shell intermediate portion, vane rings is in motor places volute of blower, by support motor main shaft is fixed on the spiral case both ends of the surface, the utility model is realized by following measure: impeller outer diameter d ₂=380～404mm, inner diameter d ₁=343～350mm, air outlet established angle β ₂=164～171 °, suction port established angle β ₁=47～53 °, impeller width b=(128～136) * 2, spiral case diffusion angle α=5.7～6.5 °, spiral case width B=297～303mm, snail tongue central angle φ=47～63 °, angle of flare γ=27～33 °.

The snail tongue room t of centrifugal fan of the present utility model and impeller outer diameter d ₂Ratio t:d ₂=0.03～0.08.

Fig. 1 is the structural representation of the utility model centrifugal fan;

Fig. 2 is the side view of the utility model centrifugal fan;

Fig. 3 is the blade wheel structure figure of the utility model centrifugal fan;

Fig. 4 is the impeller side view of the utility model centrifugal fan;

Fig. 5 is the partial enlarged drawing of the impeller side view of the utility model centrifugal fan;

Below in conjunction with accompanying drawing the utility model centrifugal fan is described further:

Fig. 1,2 is the shape assumption diagram and the side view of centrifugal fan of the present utility model, and among the figure: 1 is impeller, 2 evolute motor, 3 spiral cases, 4 supports, 5 snail tongues; Among Fig. 2: α is a snail tongue diffusion angle, and φ is a snail tongue central angle, and γ is an angle of flare; Fig. 3,4,5 is blade wheel structure schematic representation and side view, partial enlarged drawing, and 6 is impeller mid-game, 7 blades, 8 end plates, d among the figure ₁Profile ID, d ₂Impeller outer diameter, β ₁Suction port established angle, β ₂The air outlet established angle, impeller 1 is close to the intermediate portion that solid screw directly is fixed on evolute quiet motor shell, and impeller 1 places in the spiral case 3 around motor, by support 4 motor main shaft is fixed on spiral case 3 both ends of the surface, and spiral case is a log spiral shape.Impeller adopts forward multiple wing formula, blade sheet metal, aluminium sheet or alloy sheets or other sheet of metallic material impact briquetting.Centrifugal fan of the present utility model mainly is and H50 air conditioner assembly cover, also can use in other low noise ventilation occasion, therefore, on the basis of former project organization, the utility model has adopted above-mentioned solution best fit, and it is supporting with 4-72 series 3.2# blower fan to have solved present H50 air-conditioning draught fan, and noise is up to 78dB(A), total head is on the low side and blower fan adopts belt type transmission, the problem that belt and coupling easy break-down can not reliably turn round.

The supporting air-conditioning draught fan of centrifugal fan of the present utility model and existing and H50 is compared has following advantage:

1, rotating speed is low, volume is little, in light weight, installation and maintenance convenient, running is reliable;

2, the geomery of impeller, spiral case and cooperatively interacting rationally;

3, spiral case forms with sheet metal spot welding, and technology is simple, cost is low;

4, as follows according to GB2888 " blower fan and Roots blower noise measuring method " and JB/TQn-84 " ventilator airperformance test method " test result: flow 5000m ³/ h, total head 63mmH ₂O, efficient 72%, noise is lower than 73dB(A), install on the H50 air-conditioning unit, the system test noise is lower than 63dB(A), be lower than the noise requirements of NBS to the H50 air conditioner.

Embodiment:

Low noise evolute motor, rated power 2KW;

Impeller shape is the forward multiple wing formula: be of a size of d ₂=400mm, d ₁=347mm;

Air outlet established angle β ₂=167.5 °, suction port established angle β ₁=50 °, width of blade b=132 * 2, spiral case diffusion angle α=6.1 °, width B=300mm, snail tongue central angle φ=50 °, the centrifugal fan of a playscript with stage directions model utility, using effect the best are made in angle of flare γ=30 °.

Claims

1, a kind of centrifugal fan, comprise: the evolute motor, forward multiple wing formula impeller and spiral case, impeller 1 directly is fixed on evolute quiet motor shell intermediate portion, vane rings in motor places volute of blower 3, electric machine main shaft 5 is fixed on the spiral case both ends of the surface of the present utility model being characterised in that by support 4: impeller outer diameter d ₂=396～404mm, inner diameter d ₁=343～350mm, air outlet established angle β ₂=164～171 °, suction port established angle β ₁=47～53 °, impeller width b=(128～136) * 2, spiral case diffusion angle α=4.7～6.5 °, spiral case width B=297～303mm, snail tongue central angle φ=47～63 °, angle of flare γ=27～33 °.

2, according to the described centrifugal fan of claim 1, it is characterized in that: snail tongue 5 clearance t and impeller outer diameter d ₂Ratio t:d ₂=0.03～0.08.