FIELD: pumps.
SUBSTANCE: present invention provides a pump comprising a pump body provided with a water inlet and a water outlet. The pump housing contains a jet tube and an impeller. The fluid flows sequentially through the water inlet, jet tube, impeller and water outlet. At the outer periphery of the jet tube there is at least one flow increasing channel. The flow increasing channel is made around the outer part of the jet tube. The flow increasing channel communicates with the water inlet and the impeller inlet. The fluid passing through the flow increasing channel is thrown out by the impeller into the discharge chamber. The flow increasing channel is equipped with a spool valve. Movement of the spool in the flow increasing channel leads to the opening or closing of the flow increasing channel.
EFFECT: problem of cavitation is solved by creating a flow increasing channel, and the present invention has a simple production process and low production costs.
10 cl, 7 dwg
