CN203146412U - Irregularly-shaped fan blade of draught fan - Google Patents

Abstract

The utility model discloses an irregularly-shaped fan blade of a draught fan, which includes a fan blade formed by suppressing a metal sheet and taking the shape with large upper and lower ends and a small middle part, wherein an upper mounting foot and an upper external angle are arranged at the upper end of the blade, and a lower mounting foot and a lower external angle are arranged at the lower end of the blade; the two ends and the small middle part of the blade form the irregularly-shaped fan blade of the draught fan; the shape of the irregularly-shaped fan blade conforms to fluidics of wind; the blade is combined with a main ring and a locating ring to form a whole wind wheel, then is connected with an inner bore of the main ring through an output shaft of a motor, and finally is mounted in a volute with two air inlets at the two ends; under driving by rotation of the motor, greater air flow is produced at two ends of the air wheel, so that strong and powerful air suction can be formed at two ends of the volute; and moreover, with adoption of a smoke exhaust ventilator equipped with the draught fan with the irregularly-shaped fan blade, the powerful smoke suction and exhaust effect can be realized, and the purpose of the irregularly-shaped fan blade can be achieved.

Description

The abnormity impeller of blower

Technical field

The utility model relates to special-shaped impeller of blower, particularly, but also says that not exclusively the utility model relates to the centrifugal fan fan blade, as is installed in centrifugal fan indication fan blade above the range hood.

Background technique

Centrifugal fan is to be installed in most critical parts above the range hood at present, and disclosing various centrifugal fans at present has motor, spiral case, receded disk impeller to combine.

Common this receded disk impeller textural association is made up of main circle, the identical long strip blade of some shapes and positioning ring.

Main circle center hole is connected with motor output shaft, and long strip blade one end is connected with main circle outer ring, and the other end is connected with positioning ring.

Above-mentioned long strip blade integral is pressed into certain radian, and there is several angle to be installed in main circle with above the positioning ring, form centrifugal impeller whole and be installed in the spiral case inboard after motor output shaft is connected, motor rotates the drive centrifugation blade and presses the certain orientation rotation, oil smoke is inhaled in the middle of the impeller, the impeller that rotates at a high speed by certain orientation produces centrifugal force, under action of centrifugal force, the oil smoke that enters the impeller inner ring is thrown out of the impeller outer ring, pass through radial shift, oil smoke is excluded from the spiral case exhaust outlet, reach the purpose of certain pump drainage oil smoke.

Equal to suck in the centrifugal impeller air quantity according to the air quantity in spiral case outlet port in theory, but in fact the airflow pressure of entry port and spiral case exhaust outlet is not equal in the middle of the centrifugal impeller, reason is that the airflow pressure of exhaust outlet is through the peculiar radial variation size of spiral case inner ring and centrifugal impeller outer ring, make air through the compression in fan blade on the wind wheel and gap, spiral case outlet port, just make the spiral case outlet port have the air of certain pressure to blow out.

But owing to use the defective of fan blade at present above the centrifugal wind wheel, not through the little arc displacement in big centre up and down, make the air in the centrifugal impeller that the bigger variation of flowability not take place, thereby make the scroll casing type centrifugal blower that is installed at present above the range hood, when exhaust air rate reaches or exceed industry standard, and suction oil smoke effect is unsatisfactory.

In order to increase blower fan suction air quantity, producer attempts to increase blower fan air draft suction ability by the perforate simultaneously of spiral case two ends, but in fact the intake grill increase does not make blower fan suction ability increase.

Summary of the invention

Technical problem to be solved in the utility model is for this reason, overcome the single shape of fan blade of existing scroll casing type centrifugal blower not through the little variation in big centre up and down, spiral case two ends air intake does not increase the suction effect, make the scroll casing type blower fan of prior art be installed in the technological deficiency of smoking weak effect above the range hood, provide a kind of two ends big, middle little special-shaped impeller of blower, two ends air intake spiral case blower fan suction effect is improved greatly, in order to realize technical purpose of the present utility model, the technical solution of the utility model is: be pressed into the little fan blade in big centre up and down by tinsel.

Described fan blade two ends be respectively go up installation foot, go up the exterior angle, installation foot, exterior angle down down, form the fluidics shape that meets wind with the centre part that diminishes, form special-shaped impeller of blower.

After described fan blade is combined to form wind wheel integral body with main circle, positioning ring, after being connected, endoporus is installed in the air intake spiral case of two ends with main the circle by motor output shaft, rotate under the drive at motor, the wind wheel two ends have big air to flow, making the spiral case two ends form strong air introduces, range hood with the centrifugal fan that the special-shaped impeller of blower of the utility model is housed has strong smoking and smoke discharging effect, reaches the purpose of this utility model.

Making of the present utility model and working principle are such: with sheet metal direct pressing cost model utility abnormity impeller of blower shape on the die pressure machine, then special-shaped impeller of blower two ends installation foot respectively with main circle, positioning ring is connected to form a wind wheel integral body, the wind wheel master enclose center hole by be installed in the air intake spiral case of two ends after motor output shaft is connected, electrical power rotates to drive the special-shaped fan blade wind wheel rotation of the new lane of this practicality is housed, make the wind wheel two ends have big air to flow, the spiral case two ends form strong air and introduce, use the centrifugal fan of the utility model abnormity impeller of blower to be installed in above the smoke extractor, make range hood that strong smoking and smoke discharging effect be arranged.

Description of drawings

Figure 1 shows that the utility model abnormity impeller of blower shape view:

Figure 2 shows that the utility model abnormity impeller of blower installation shaping wind wheel view:

Embodiment

Fig. 1 is pressed into greatly up and down by tinsel, middle little fan blade 5 shape views, fan blade 5 comprise, last installation foot 4, goes up exterior angle 3, installation foot 1, exterior angle 2 down down, meets the fluidics shape of wind with the centre part formation that diminishes.

Fig. 2 is that fan blade 5 is combined to form wind wheel integral body with main circle 7, positioning ring 6, can be installed in the air intake spiral case of two ends after endoporus 8 is connected with main the circle by motor output shaft.

Claims (1)

1. a special-shaped impeller of blower is characterized in that, is pressed into the little fan blade (5) in big centre up and down by tinsel, and fan blade (5) comprises installation foot (4), last exterior angle (3), following installation foot (1), following exterior angle (2).

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