Regarding positive pressure ventilation for motors
Thread Content
Can installing ventilation ducts at the motor slip rings and using a blower to supply air achieve positive pressure ventilation for explosion prevention?
Four units in our facility use this system, and so far there has been no instance of motor failure
The key here is to check whether the air blown by the blower contains any unwanted excess substances! Otherwise, it won’t work.
Are there explosion-proof motors available for high-power motors?
1 High-power motors can be explosion-proof, but it depends on how large they are. 2 There are many types of explosion protection methods, and positive pressure ventilation is one of them. 3 Positive pressure ventilation relies on a supplementary system that delivers non-flammable and non-explosive air to the enclosed area where the motor is located
No, the reason it didn’t explode is simply that it didn’t explode even without a fan. There is only one way to achieve positive pressure ventilation: install a blower at a location upwind and far enough away from the production area, use pipes to lead the air to the intake, and then have it exit through the motor’s exhaust. It is essential to ensure the quality of the air coming in, as well as to maintain sufficient pressure in order to prevent explosions; otherwise, it is nothing but self-deception.
As long as the quality of the incoming air is ensured and a positive pressure is maintained at the motor slip rings, this should serve to prevent explosions. Our factory uses this approach with three units, and the results are quite good.
It mainly involves bringing non-flammable gases to the enclosed areas where the motor connections are located; generally, air from instruments is used, while nitrogen is hardly ever used. Positive pressure ventilation is generally used for the motors in large units, while explosion-proof motors are sufficient for small units.
I believe a fan has three main functions; what we call a slip ring fan as well: first, positive pressure ventilation for explosion prevention; second, cooling; third, removing the graphite powder generated by the brushes and slip rings to keep the slip rings clean
I believe a fan has three main functions; what we call a slip ring fan as well: first, positive pressure ventilation for explosion prevention; second, cooling; third, removing the graphite powder generated by the brushes and slip rings to keep the slip rings clean