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Title:
GEAR PUMP FOR VISCOUS FLUID
Document Type and Number:
Japanese Patent JP2000087872
Kind Code:
A
Abstract:

To provide a gear pump for a viscous fluid formed as an internal bearing type self-lubricating with the conveyed viscous fluid and provided with a shaft sealing device that can impede the leakage of this fluid to the outside.

A shaft sealing device SS for a driving shaft 4S piercing a side plate 2 of a gear pump is composed of labyrinth seal mechanism LS with a labyrinth cylinder 8 surrounding the driving shaft 4S and forming an annular clearance along the peripheral surface of the driving shaft 4S to perform sealing function and mechanical seal mechanism MS performing a sealing function by mutual sliding contact between a rotating ring disposed outside of the labyrinth seal cylinder 8 and fixed to the driving shaft 4S, and a fixed ring fixed to the side of the side plate 2. The leakage of a viscous fluid is impeded by both seal mechanisms, and internal pressure can be kept constant so as to impede inflow of air from the outside.


Inventors:
IMAGAWA TAKAO
Application Number:
JP25429098A
Publication Date:
March 28, 2000
Filing Date:
September 08, 1998
Export Citation:
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Assignee:
SHIMADZU CORP
International Classes:
F04C2/18; F04C13/00; F04C15/00; F16J15/34; F16J15/447; (IPC1-7): F04C2/18; F04C13/00; F04C15/00; F16J15/34; F16J15/447
Attorney, Agent or Firm:
Yoshiaki Nishioka