Cleaning apparatus for the wet cleaning of building walls and floors, swimming pools, automobiles and the like

Claim 1

A cleaning apparatus for wet cleaning of walls or floors of buildings and the like by means of a high-pressure jet of a relatively cold washing liquid, comprising a housing; an electromotor including a stator and an armature; a pump having a drive driven by said electromotor and operative for generating said high-pressure jet, said electromotor and said pump being accommodated in said housing, said housing being filled with an electrically non-conductive coolant to such a level that said pump and said electromotor are located below said level, said coolant contained in said housing constituting an operating space; a shaft having an upper end and a lower end and carrying said armature and extending through said operating space, said drive being mounted on said lower end and axially offset relative to said armature; means for conducting said washing liquid within said housing, said conducting means being exposed to said coolant which is continuously cooled in heat exchange relationship with the washing liquid; and means for circulating said coolant within said housing including a central suction passage formed in said shaft and extended in an axial direction thereof up to said upper end and at least one cross bore also formed in said shaft at the upper end thereof and communicating with said passage, said circulating means at least indirectly causing the continuous forced circulation between cold and heated coolant in said operating space.