Protection measures of explosion-proof submersible pump is divided into two categories: the first category measures allow motor Explosion but not Qinji cavity, spread to the surrounding medium; second kinds of measures are taken in isolation measures between conductive parts and explosive medium, or may prevent a conductive part and the explosive mixture of contact spark and danger local heating.

The explosion-proof measures of the first type of explosion-proof submersible pumps are explosion-proof cases, and their explosion-proof type is flameproof. The explosion-proof outer shell of a flameproof motor can withstand the pressure produced by the explosion of the inner cavity. There is a long enough gap between the cover and the end cover to cool the sparks from the inner cavity of the motor and the gas after the explosion to the safe temperature.

The second type of explosion-proof measures is to separate the conductive parts which are able to ignited the explosive gas mixture with explosive gas mixture with liquid, pure air or Sui gas. Under normal operating conditions, does not produce electric arc, spark or structure can ignite explosive gas mixture, take measures to improve the safety of the motor, the explosion-proof type is increasesafety motor; dangerous parts prone to spark and local heat insulation soaked in oil, improve the safety of the motor. Explosion proof type oil filled type; explosion-proof type explosion-proof submersible pump and other positive pressure type, filling sand, encapsulation and intrinsic safety, etc..

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