公开(公告)号：US20230400017A1

公开(公告)日：2023-12-14

申请号：US17840111

申请日：2022-06-14

Applicant: HYDAC FLUIDTECHNIK GMBH

Inventor： Christian GROH ,  Frank KATTLER

IPC: F04B17/04

CPC classification number: F04B17/04

Abstract: A pump device having a pump piston (12) arranged in a longitudinally movable manner in a pump housing (10), which pump piston is actuated by an actuating solenoid device (14) to open an outlet valve (16) for discharging a fluid during a delivery stroke, characterized in that in a pump space (18) of the pump housing (10), during a suction stroke, the pump piston (12) generates a negative pressure and, upon passing over a control edge (20) delimiting the pump space (18), the piston establishes a fluid connection between a fluid inlet (22) in the pump housing (10) and the pump space (18) in such a way that the pump space (18) under the effect of the negative pressure present in the pump space (18) is filled with a filling volume, which results from a fluid flow routed along the outer circumference (24) of parts of the pump piston (12) in the direction of the outlet valve (16), and subsequently, during the delivery stroke, this filling volume is discharged from the pump space (18) via the outlet valve (16).