□□□□ for the study, understands the ventilator, this article first introduces some most basic knowledge.

1.1. Ventilator classification

Below □□□□ according to the structure and the principle of work, makes the ventilator classifies:

1.2. Ventilator application

□□□□ the ventilator widely applies to each industry sector, generally says, the centrifugal ventilator is suitable for the small current capacity, the high pressure place, but the axis flows the type ventilator then commonly used to great current capacity, low pressure situation.

First, the boiler uses the ventilator

□□□□ the boiler may select the centrifugal type or the axis with the ventilator according to the boiler specification flows the type. Also presses its function to divide into the boiler ventilator - to the boiler in the air transport; The boiler drawing fan - pulls out the boiler in haze.

Second, well ventilated takes a breath with the ventilator

□□□□ this kind of ventilator generally is well ventilated takes a breath for the factory and each kind of building and heats well ventilated uses, the request pressure is not high, but the noise request must be low, may use the centrifugal type or the axis flows the type ventilator.

Third, the industry stove (cupola, smith's forge, metallurical furnace and so on) use the ventilator

□□□□ this kind of ventilator request pressure is higher, generally is 2,940 ~ 14,700 N/m 2, namely high pressure centrifugal fan scope. Because the pressure high, the impeller circumferential velociy is big, when designs the impeller must have the enough intensity.

Fourth, the mine pit uses the ventilator

□□□□ it has two kinds: One kind is the host ventilator (called main fan), uses for to the mine shaft transportation fresh air, its current capacity bigger, uses the axis to flow the type to be more appropriate, also useful centrifugal type; Another kind is the partial ventilator (called bureau fan), uses in mine pit working surface ventilating, its current capacity, the pressure are small, uses the explosion-proof axis to flow the type ventilator.

Fifth, powdered coal ventilator

□□□□ transports the heating and power station boiler combustion system the powdered coal, uses the centrifugal-type air blower. The powdered coal ventilator is different according to the use may divide two kinds: One kind is the storage bin type powdered coal ventilator, it is blows the storage bin in powdered coal from its side in the chamber, the powdered coal not directly through the air blower, requests the ventilator the exhaust pressure to be high; Another kind straight blows the type powdered coal ventilator, it directly gives the powdered coal the chamber. Because the powdered coal is serious to the impeller and the body shell attrition, therefore should use the anti-friction material.