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Title:
LIQUID SEAL PUMP
Document Type and Number:
Japanese Patent JPH05118285
Kind Code:
A
Abstract:

PURPOSE: To always provide a stable shaft seal effect, enhance performance in a high vacuum region, and facilitate maintenance of high vacuum even when outside shaft sealing pressure water is not available.

CONSTITUTION: An impeller 30 is eccentrically provided in a cylindrical casing 21. Because of actuation of a liquid seal ring 7 formed in the casing 21 due to rotation of the impeller 30, gas is sucked from a suction port 23 of a casing side-plate 22 via a suction chamber 26 inside a casing cover 25, and discharged from a discharge port via a discharge chamber of the casing cover 25. In the casing cover 25, besides the suction chamber 26 and the discharge chamber a pressure chamber 28 having an opening 29 at a dead point part of the casing 21 is formed to pass a part of liquid film pressure water via the pressure chamber 28 to a seal water ring 10a of a shaft seal part 10 so that stable shaft seal effect can be always obtained.


Inventors:
SHIMAZU KIYOSHI
Application Number:
JP17836391A
Publication Date:
May 14, 1993
Filing Date:
July 18, 1991
Export Citation:
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Assignee:
EBARA CORP
International Classes:
F04C19/00; F04C27/00; (IPC1-7): F04C19/00; F04C27/00
Domestic Patent References:
JPS54126109U1979-09-03
JPS5372807U1978-06-17
JPS61167196A1986-07-28
Attorney, Agent or Firm:
Shigeru Yagita (3 outside)