CN2205462Y - Pneumatic anti-wearing wind engine blade - Google Patents

Abstract

The utility model relates to a fan blade used in occasions with dust. The fan blade is characterized in that pneumatic abrasion proof strips which respectively form a semicircular column shape or other shapes are milled or planned near one side which is easily abraded at the surface of the fan blade, and the pneumatic abrasion proof strips are regularly convex. The abrasion proof strips are vertical to the direction of gas flow. The pneumatic abrasion proof strips can reduce the percussion frequency and the speed of particles for the surface of the blade. Simultaneously the noise of a fan can be reduced. The index of an original pneumatic characteristic can be kept. The service life can be improved by nearly four times. The utility model can be widely used in various fields, such as a power plant, a steel plant, various furnaces, a mine, the cement industry, the chemical industry, etc.

Description

Pneumatic anti-wearing wind engine blade

The utility model relates to the blower fan field, belong to the blower fan that a kind of dust-laden occasion is used specifically, be widely used in coal powder fan, the induced draught fan of thermal power plant, the sintering blower fan of Iron And Steel Plant, dedusting fan can be used for the blower fan that moves under the dust-laden conditions such as various kilns, mine, cement plant and chemical plant simultaneously.

Run on the blower fan under the dust-laden condition at present, working life is very short, and be a current engineering circle assistant officer problem to be solved the working life of how to improve this blower fan.Cause blade wear for solving, adopt respectively at sheet surface coated with hard alloy powder, blade surface and heat-treat because of grit in the air-flow impacts blade surface.Blade surface covers ceramic plate or blade surface built-up welding strip scuff-resistant coating etc. again, and its purpose improves the wear-resisting property of blade by the hardness of reinforced blade, to prolong the working life of blower fan.But above-mentioned measure complex process, the cost costliness perhaps makes vane type line change because of being heated, finally cause the aeroperformance variation of blower fan.

The purpose of this utility model provides a kind of neither coated cemented carbide; do not need the surface to heat-treat or built-up welding strip scuff-resistant coating again; more can not change the aeroperformance of blower fan, even more important is to adopt pneumatic protective measure to improve the blower fan pneumatic abrasionproof fan blade in working life.

For finishing the technological scheme that above-mentioned purpose is taked: in the abrading section of the fan blade surface rapid wear one side system of milling or dig semi-cylindrical or the pneumatic chafing strip of other shapes that is shaped on the rule projection, the chafing strip that is provided with on the blade is vertical mutually with gas flow direction, increase the roughness of blade surface on the one hand, boundary layer thickening when making air flow stream cross blade, reduce grit and blade surface touch opportunity, the buffering grit is to the striking velocity of blade surface; When gas one particle two phase flow flow through chafing strip on the other hand, dust-contained airflow streamed on its windward side, can walk around chafing strip to fine particle especially, away from blade surface; The thickness of blade has been thickeied in chafing strip existence itself simultaneously, and blade is had certain protective role, the therefore whole life-span that increases blower fan.

The utility model is embodiment described in detail in conjunction with the accompanying drawings.

Fig. 1 is the centrifugal blower fan blade wheel structure;

Fig. 2 is model utility blade structure figure.

According to illustrated in figures 1 and 2.Blower fan is by wheel disc 1, and blade 2 and wheel cap 3 three parts are formed.Near some regular projections of the utility model system of milling the abrading section of blade 2 surperficial rapid wear one sides are the pneumatic chafing strip 4 of semi-cylindrical or other shapes, and the chafing strip 4 that is provided with on the blade is vertical mutually with gas flow direction.

The pneumatic chafing strip 4 of this semi-cylindrical or other shapes is fit to system of milling or plane system on the different shape blade, and it is provided with near mainly putting the abrading section that is all kinds of blade surface rapid wear one sides.

The setting of the utility model chafing strip 4 meets Gas-solid Two-phase Flow characteristics in the blower fan, thereby reduce frequency of impact and the speed of particle to blade surface, can improve nearly four times of dust-laden blower fan working life, reduce the noise of blower fan simultaneously, and keep its original aerodynamic characteristic index, the corresponding minimizing manufacture cost of simplified manufacturing technique.

Claims (1)

1. A kind of pneumatic abrasionproof fan blade that is used for the dust-laden occasion is characterized in that the damageable zone system of milling of the surperficial side of blade (2) or digs the semi-cylindrical chafing strip (4) that is shaped on the rule projection that the setting of this chafing strip (4) is vertical mutually with gas flow direction.

Images