Explosion proof centrifugal fan is usually used to transport inflammable and explosive gases or inflammable and explosive gases, smoke and liquid in the environment.
In this kind of environment, if the fan causes small sparks in the operation link, it will be serious.
Therefore, the centrifugal fan must be treated with particularity.
Explosion proof centrifugal fans are generally considered to use only explosion-proof motors.
Explosion proof motor is only an important part of explosion-proof centrifugal fan, but it is not explosion-proof centrifugal fan, but explosion-proof centrifugal fan.
Under the assumption that only the motor adopts explosion-proof design, can other spare parts ensure that it is not easy to produce small sparks?
For example: when the wind wheel rotates at high speed, it will fail, and when it meets the vent, it will produce small sparks of collision.
Compared with all kinds of products and workpieces that may produce small sparks in centrifugal fans, they must be explosion-proof.
For some products, the workpiece must be produced and processed with the selected material.
The iconic is the wind wheel. Considering the design of centrifugal fan, the smaller the distance between wind wheel and vent, the better the wind pressure and tightness.
Therefore, the greater the possibility of collision.
Be sure to choose aluminum as the material of the wind turbine.
The hardness of aluminum wind wheel may not be as good as that of other materials.
However, aluminum has a characteristic that no spark will be generated when the collision occurs.
The disadvantages are also obvious. In other words, in case of collision, the wind wheel is basically deformed and scrapped.
Some manufacturers have increased the collision between the wind wheel and the air inlet to reduce the collision between the wind wheel and the air inlet. This can reduce the chance of collision.
However, the air volume, air pressure and efficiency of the fan are reduced.
We also encountered some customer reports about why the fans with the same parameters and the same operating environment.
The air volume and pressure of some centrifugal fans can not meet the requirements.
This is a process problem. If the pressure in the fan is insufficient, how can the parameter effect be achieved!
The fan factory with powerful technology will control the distance between the wind wheel and the air inlet within a reasonable range to ensure good internal pressure and efficiency of the fan.
Next, let's talk about the structure and principle of explosion-proof centrifugal fan.
Explosion proof centrifugal fan is used in flammable and explosive gas occasions to avoid accidents caused by some flammable and explosive objects.
When the centrifugal fan is in use, it will encounter the combustible and explosive components, floating ash, smoke and dust or components that are easy to volatilize quickly in the transmission steam. When the motor short-circuit fault, route problem and the sliding friction between the impeller and parts of the centrifugal fan form a flame in the operation process of the centrifugal fan, it will ignite and detonate the transmission components or steam, resulting in serious accidents, Cause serious casualties and economic property losses to the operation Department.
The characteristics of explosion-proof centrifugal fan are as follows:
1. Any centrifugal fan parts that touch the steam body must be non-ferrous raw materials. Generally speaking, aluminum parts can work under 250 ℃.
2. The seals of impeller and shaft through-hole of centrifugal fan must be non-ferrous raw materials. Generally speaking, aluminum impeller or aluminum alloy casing can operate within 250 ℃.
3. The centrifugal fan frame must ensure that when the impeller or shaft moves abnormally, the sliding friction between its components is not easy to form any flame.
