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1. (WO2018159680) PUMP DEVICE AND MAINTENANCE METHOD FOR PUMP DEVICE

Pub. No.:    WO/2018/159680    International Application No.:    PCT/JP2018/007510
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Thu Mar 01 00:59:59 CET 2018
IPC: F04D 29/10
F16J 15/3204
Applicants: EBARA CORPORATION
株式会社 荏原製作所
Inventors: YASUDA ,Makoto
安田 誠
NUMATA, Manabu
沼田 学
OKAMOTO, Shigeru
岡本 茂
Title: PUMP DEVICE AND MAINTENANCE METHOD FOR PUMP DEVICE
Abstract:
This pump device has: a main shaft for rotating an impeller that pressurizes a conveyed liquid through driving of a drive machine in a predetermined direction; a bearing that rotatably supports the main shaft; a bearing cover that is penetrated by the main shaft; and a seal member that prevents a lubricant of the bearing from leaking from a sealed fluid side through the outer peripheral surface of the main shaft to the atmosphere side, wherein the bearing cover is configured such that the lubricant spattered from the bearing flows through the bearing cover to the seal member, and the main shaft is provided with, on the outer peripheral surface, a groove that is inclined so as to force back the lubricant on the outer peripheral surface of the main shaft from the atmosphere side to the sealed fluid side when the main shaft rotates.