Abstract: A plunger type water pump mainly comprises a cavity body, a rotary main shaft and a plunger flow-distributing unit. The plunger flow-distributing unit comprises a flat valve assembly, a plunger-shoe assembly and a supporting valve assembly. The plunger-shoe assembly divides the cavity body into a high-pressure cavity and a low-pressure cavity independent of each other. The high-pressure cavity is in fluid communication with the flat valve assembly; and the low-pressure cavity is in fluid communication with the supporting valve assembly. The high-pressure water and the low-pressure water are independent of each other. This arrangement ensures a high volumetric efficiency of the water pump under ultra-high-pressure conditions and provides fluid support and lubrication for a friction coupling under high-speed heavy-load conditions to prolong the service life of the water pump.

Abstract: The present disclosure provides a plunger type water pump, which mainly comprises a cavity body, a rotary main shaft and a plunger flow-distributing unit. The plunger distributing unit comprises a flat valve assembly, a plunger-shoe assembly and a supporting valve assembly; the plunger-shoe assembly divides the cavity body into a high-pressure cavity and a low-pressure cavity independent of each other; the high-pressure cavity is in fluid communication with the flat valve assembly; and the low-pressure cavity is in fluid communication with the supporting valve assembly. According to the present disclosure, the high-pressure water and the low-pressure water are independent of each other. This can ensure a high volumetric efficiency of the water pump under ultra-high-pressure conditions and surely provide the fluid supporting and lubrication for a friction coupling under high-speed heavy-load conditions so as to prolong the service life of the water pump.