Patent ID: 11867177
Assignee: MIKUNI CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A pump device comprising:
a housing which comprises a suction passage defining a suction port at an upstream end, a discharge passage defining a discharge port at a downstream end, and a return passage returning a part of a fluid flowing through the discharge passage to midway of the suction passage;
a pump element which is accommodated in the housing and rotates around a predetermined axis to suck, pressurize, and discharge a fluid; and
an on-off valve which opens and closes the return passage,
wherein in the suction passage upstream of an opening at which the return passage is opened to the suction passage, the housing comprises a directional wall which directs a flow of a suction fluid sucked into the suction passage from the suction port to divert from a flow of a return fluid returned from the return passage, wherein
in the suction passage upstream of the opening at which the return passage is opened to the suction passage, the housing comprises a weir part which protrudes from a bottom wall of the suction passage and defines a reservoir region storing a fluid in a region that comprises the opening, and
the weir part comprises an inclined surface forming an upward slope toward a downstream side to define the directional wall.