I wonder why, in addition to the motor needing to be explosion-proof, the impeller of a centrifugal fan also has to be explosion-proof?
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I wonder why, in addition to the motor needing to be explosion-proof, the impeller of a centrifugal fan also has to be explosion-proof?
I’ve never heard of impeller explosion protection; motor explosion protection is meant to prevent electric sparks, but is impeller explosion protection intended to prevent friction?
Based on the properties of the medium, it is indeed necessary for the fan to be explosion-proof.
I’ve never heard of explosion-proof impellers; if you’re worried about something causing a spark, install a magnetic separator and clean it regularly
It’s not about the impeller being explosion-proof; it’s the overall structure that needs to be explosion-proof. There are strict regulations for this, such as the ATEX explosion-proof certification, which sets requirements regarding materials, manufacturing processes, detailed design, and various components. I have the ATEX explosion-proof certification for my centrifugal fans, so I know that: lol
Explosion-proof fans have specific requirements for impellers and casing components, with aluminum impellers being the most common.
The fan inlet is designed with an explosion-proof throat, typically made of aluminum or copper materials
The impeller should not require separate explosion-proof certification. However, even if the motor is explosion-proof, the entire centrifuge still needs to be explosion-proof.
In simple terms, motor explosion protection is aimed at the environment in which the centrifugal fan is located, while impeller explosion protection is aimed at the gas conveyed by the centrifugal fan. If the fan is used to convey explosive gases, an explosion-proof centrifugal fan must be employed. The impeller of explosion-proof centrifugal fans is usually made of aluminum; for more details, please search for GB26410-2011