CN2473366Y - New impeller - Google Patents

Abstract

The utility model discloses a new impeller used in a blower of the transformer, mainly consisting of a petiole shaft and blades, which is characterized in that:(1). the aerofoil of the blade is a supercritical aerofoil, the K value of the camber factor is from 1.15 to 0.7;(2). the plane shape of the blade takes a large forward inclined type with high efficiency and low noise, the largest forward inclined angle Alpha is 30 degree;(3). The space structure form of the blade is a negative torsion, the torsion angle Beta is negative six degree. Compared with the prior art, the utility model makes the matching noise of the transformer achieves the required target, and the attack angle used in the blower is wide, the performance curve is steady, having broad service scale.

Description

A kind of novel impeller

The utility model is a kind of novel impeller that is applied on the transformer blower fan, also can be applicable on other ventilation equipment, and it relates to improvement on existing product structure and the performance and raising.

Along with China's transformer industry requires more and more higher to energy-conservation and environmental protection aspect, also more and more harsher to large scale industry noise of transformer index request, 1200KW transformer for example, noise objective is from original 73db (A) decline 65db (A), so transformer fan originally can not be fit to new standard-required.Its reason is that what the planar design of fan blade was originally adopted is traditional leading edge straight line type, aerofoil profile employing bended plate type or traditional aerofoil profile.In order to improve the noise objective of fan, must improve the blade wheel structure and the shape thereof of fan.

The purpose of this utility model designs the blast fan that a kind of new structure is provided at the problems referred to above just, adopts the coupling noise of fan on the 1200KW transformer cooler of this kind impeller to reach 20.5db (A), far below the index that requires to reach.And the range of angles of attack that this fan uses is wide, and performance curve is mild, wide adaptability.

The purpose of this utility model realizes by following measure:

This kind novel impeller, it mainly is to be made of petiole shaft and blade, its shaped design is characterised in that:

(1). the aerofoil profile of blade is a supercritical airfoil, and camber factor K value is 1.15-0.7;

(2). the plane shape of blade is a big preceding bending efficient, low noise, and maximum kyphotic angle α is 30 °;

(3). the spatial structure form of blade is that negative twist is changeed, and torsion angle β is-6 °.

The drawing of accompanying drawing is described as follows:

Fig. 1 is the utility model form structure schematic representation

Fig. 2 is the worm's eye view of Fig. 1

Below with reference to drawings and Examples the utility model is further described:

Shown in accompanying drawing 1-2, this kind novel impeller, it mainly is to be made of petiole shaft 1 and blade 2, and blade 2 adopts big antecurvature overcritical low speed aerofoil profile, and its concrete shaped design is characterised in that:

(1). the aerofoil profile of blade 2 is overcritical YH-1 aerofoil profile, and camber factor K value is 1.15～0.7;

(2). the plane shape of blade 2 is a big preceding bending efficient, low noise, and the kyphotic angle curve is changes shape, and maximum kyphotic angle α is 30 °;

(3). the spatial structure form of blade 2 is that negative twist is changeed, and torsion angle β is-6 °.

The utility model compared with prior art makes the coupling noise on the transformer reach requirement Index. And the range of angles of attack that this fan uses is wide, and performance curve is mild, wide adaptability.

Claims (1)

1. novel impeller, it mainly is to be made of petiole shaft (1) and blade (2), it is characterized in that:

The aerofoil profile of blade (2) is a supercritical airfoil, and camber factor K value is 1.15～0.7;

The plane shape of blade (2) is big preceding bending, and maximum kyphotic angle α is 30 °;

The spatial structure form of blade (2) is that negative twist is changeed, and torsion angle β is-6 °.

Images