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With the continuous development of the coal mining industry in recent years, major mine accidents caused by colliery flood emerge in endlessly in China. Therefore, mine flood has been one of the bottlenecks restricting to China's exploitation of resources and large submersible pump is the only effective equipment for the prevention and rescue in mine-flood accident. Based on the BQW50 mine pump, this paper presented a new-type explosion-proof submersible mine pump with inner motor, and put forward the explosion-proof design, structural design and hydraulic design of mine pump. In addition, three-dimension unsteady turbulent flow calculations were implemented for this mine pump, and the strain caused by water pressure in the volute could be obtained by using the elastic finite element method for non-steady-state. Moreover, through the iterative coupled calculations between the fluid mechanics and solid mechanics, coupled analyses in the volute with the material of QT600-3 were obtained. The results indicate that the maximum stress appears at the junction between the volute tongue and the cover plate while the maximal strain comes out in the front cover plate in front of the volute tongue. In the case of normal working conditions, the resonance caused by the pressure pulsation appears unlikely. This paper is instructive to the proper design on the mine pump.