Title:
【発明の名称】インターナルポンプ
Document Type and Number:
Japanese Patent JP2569137
Kind Code:
B2
Abstract:
PURPOSE:To drastically increase the angular moment of inertia that the rotary shaft system of the internal pump has by providing a flywheel of optional size halfway between an upper radial bearing and a motor rotor. CONSTITUTION:The flywheel 13 for increasing the inertia of rotation is provided halfway between the upper part of the motor rotor 7a of the internal pump and the upper radial bearing 8a. Consequently, the center of gravity of the rotary shaft system can be positioned between both shafts of the radial bearing 8a above the flywheel and the motor lower radial bearing 8b, so a remarkable decrease in the natural frequency of the rotary shaft system can be suppressed. Further, the flywheel 13 is positioned above the motor rotor 7a, so heat generated by the rotation of the flywheel 13 is easily conducted to the upper part to prevent the temperature of the motor part from rising.
Inventors:
Nakahira Shiro
Akihisa Okada
Ueda Masayuki
Akihisa Okada
Ueda Masayuki
Application Number:
JP18848088A
Publication Date:
January 08, 1997
Filing Date:
July 29, 1988
Export Citation:
Assignee:
株式会社日立製作所
International Classes:
G21C15/243; F04D7/08; (IPC1-7): G21C15/243; G21C15/243
Domestic Patent References:
| JP2169893A | ||||
| JP5273380A |
Attorney, Agent or Firm:
Katsuo Ogawa (1 person outside)