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Title:
PERIPHERAL PUMP
Document Type and Number:
Japanese Patent JP2000170683
Kind Code:
A
Abstract:

To continuously lower both discharge pressure and discharge capacity of a pump down to zero when revolving speed of a driving shaft is excessive and obtain both discharge pressure and discharge capacity as nearly high as those of a fixed discharge capacity type pump for high discharge capacity operation.

In housings 2, 3, a large number of semicircular grooves 12a, 12b are formed in the radial direction on the side surface of a disc-like impeller 11 installed in a driving shaft 6, while working chambers 18, 19 as nearly an annular groove having a semicircular sectional form and facing the grooves 12, 13 are formed on the inner wall surface of the housings 2, 3. A discontinuous part of the working chambers 18, 19 remains in between a neighboring intake port 16 and a discharge port, and both ends of it are connected to the intake port and discharge port, respectively. The discontinuous part of the working chambers 18, 19 comprises piston-like movable partitioning parts 22, 23 for controlling the quantity of liquid leaking from the discharge port side into the intake port 16 side by opening/closing a gap between the side surface of the impeller 11 and the inner wall surface of the housings 2, 3.


Inventors:
KADOKAWA MASARU
ONIMARU SADAHISA
MATSUI HIROHITO
INAGAKI MITSUO
MORIKAWA TOSHIO
Application Number:
JP1998000346017
Publication Date:
June 20, 2000
Filing Date:
December 04, 1998
Export Citation:
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Assignee:
NIPPON SOKEN
DENSO CORP
International Classes:
F04D5/00; F04D15/00; F04D23/00; F04D27/00; (IPC1-7): F04D5/00; F04D15/00
Attorney, Agent or Firm:
石田 敬 (外3名)