The submersible pump [1] is a positive pressure conveying vertical pump that can effectively solve the problems of air lock and cavitation. The explosion-proof level of conveyed materials determines that submersible pump products have different structures, working principles, classifications, scopes of application, product advantages and disadvantages, and operating methods. They can be simply divided into traditional submersible pumps (explosion-proof zone 1 outside the tank, zone 0 inside the tank There are two categories: non-explosion-proof) and new submersible pumps (explosion-proof in zone 1 outside the tank and zone 0 inside the tank).