Coal mine water drainage has the characteristic of poor water quality, much coal dust suspended solids and big water hardness. Traditional water source heat pump adopts Tube shell type water-cooling condenser and evaporator, without adequate heat exchange, with suspended solids plugging after subsiding. Based on this problem, Serpentine casing module type vortex water source heat pump units was studied, developing module type vortex heat pump units, with a complete set of scroll compressor, thermostatic expansion valve and other equipments, New type of condenser, evaporator, control device were designed, The performance of the vortex heat pump units was tested, the design parameters of the product were settled.