公开(公告)号：US11867177B2

公开(公告)日：2024-01-09

申请号：US18154029

申请日：2023-01-12

Applicant: MIKUNI CORPORATION

Inventor： Yasuhiro Ino

IPC: F04C15/06 ,  F04C2/10 ,  F01M1/02 ,  F04C29/12 ,  F04C14/24 ,  F04C14/26

CPC classification number: F04C2/103 ,  F01M1/02 ,  F04C29/12 ,  F01M2001/0238

Abstract: A pump device includes a housing, a pump element, and an on-off valve. The housing includes 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. The pump element is accommodated in the housing and rotates around a predetermined axis to suck, pressurize, and discharge a fluid. The on-off valve opens and closes the return passage. In the suction passage upstream of an opening at which the return passage is opened to the suction passage, the housing includes 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.

公开(公告)号：US11982270B2

公开(公告)日：2024-05-14

申请号：US18298361

申请日：2023-04-10

Applicant: MIKUNI CORPORATION

Inventor： Yasuhiro Ino

IPC: F04C14/26 ,  F04C2/10 ,  F04C11/00 ,  F04C15/00 ,  F04C15/06 ,  F04C29/12 ,  F04C2/08

CPC classification number: F04C11/001 ,  F04C2/102 ,  F04C15/0057 ,  F04C15/06 ,  F04C2/084 ,  F04C2240/30 ,  F04C2240/805 ,  F05C2201/0439 ,  F05C2201/0448 ,  F05C2201/903

Abstract: The pump device includes a housing defining insertion holes for a rotation shaft, inlets and outlets, and an internal passage; a first pump element; and a second pump element. The internal passage includes first suction passages communicating from the inlet to a first suction port facing the first end surface of the first pump element directed to one end side; first discharge passages communicating from a first discharge port facing the first end surface to the outlet; second suction passages passing around the first pump element to communicate from the inlet to a second suction port facing the second end surface of the second pump element; and second discharge passages passing around the first pump element to communicate from a second discharge port facing the second end surface to the outlet.