Title:
PUMP DEVICE
Document Type and Number:
Japanese Patent JP2022183753
Kind Code:
A
Abstract:
To provide a pump device which can suppress an outer diameter of a cylindrical part becoming large, even in the case where a penetration part is provided extending in the rotation axis direction with respect to the cylindrical part of a rotor.SOLUTION: In a pump device 1, between a rotor 4 and a radial bearing 11, a penetration part 15 extending in a rotation axis direction is provided, so that a large pressure difference hardly occurs on both sides in a rotation central axis direction with respect to the rotor. The penetration part 15 is constituted by: a first groove 48 formed on an inner peripheral surface of a cylindrical part 40 of the rotor 4; and a second groove 111 formed on an outer peripheral surface of the radial bearing 11. Therefore, even in the case where the penetration part 15 having a sufficient opening area is formed, an opening area of the first groove 48 can be narrow. Therefore, since strength of the cylindrical part 40 hardly lowers by the first groove 48, an outer diameter of the cylindrical part 40 does not need to be large.SELECTED DRAWING: Figure 4
Inventors:
YAZAWA TAKEHIKO
YAMAMOTO TAKESHI
YAMAMOTO TAKESHI
Application Number:
JP2021091231A
Publication Date:
December 13, 2022
Filing Date:
May 31, 2021
Export Citation:
Assignee:
NIDEC SANKYO CORP
International Classes:
F04D13/02; F04D13/06; F04D29/58; H02K7/14
Attorney, Agent or Firm:
Kawai Toru
Shin Kodaira
Nobuko Kawaguchi
Shin Kodaira
Nobuko Kawaguchi