PUMP DEVICE AND PUMP SYSTEM

摘要

A pump device (1A) is provided with the following: an impeller (2) which rotates around a rotational axis (A); an inflow passage (10a) which extends along the rotational axis (A) of the impeller (2); a vortex chamber (10b) provided around the impeller (2); a high pressure chamber (4) provided around the inflow passage (10a); a peripheral wall (5) which separates the inflow passage (10a) and the high pressure chamber (4); and a bypass passage (6) which communicates the vortex chamber (10b) and the high pressure chamber (4). A plurality of through holes (51) are provided in the peripheral wall (5) in the circumferential direction. The center axis (B) of the through holes (51) is included in a plane substantially perpendicular to the rotational axis (A). The center axis (B) is inclined with respect to a reference line (L). The direction of inclination of the center axis (B) with respect to the reference line (L) is set so that the opening (51q) of the through holes (51) on the inflow passage side is positioned further downstream in the rotating direction of the impeller (2) than the opening (51p) on the high pressure chamber (4) side.