JET the spraying self-priming pump(hereafter refersto as electric pump),by the water pump,the seal,the electric motor three parts is composed. The electric motor machine is the single-phase asynchronous  motor,the pump part is centrifugal-type the impeller,the radial direction guide vane structure.Between the water pump and the electric motor uses the single end mechanical seal,stops the mouth seal place use "O"the shape oil  rubber seal packing collar to make the static seal fixedly.