Multistage hydraulic machine

Details Multistage hydraulic machine Multistage hydraulic machine

1985-04-10

1986-05-13

Garrett, Robert E.

Rotary kinetic fluid motors or pumps

With lubricating, sealing, packing or bearing means having...

415 1, 415500, F04D 2900

Patent

active

045883521

ABSTRACT:
A multistage hydraulic machine including a main shaft, a main shaft sealing device, and plural runners mounted on the main shaft and containing water at different pressure levels. A top cover is mounted on the highest pressure stage runner and in the space therebetween there is provided a labyrinth-type intermediate sealing device which defines a first space between the cover, the intermediate sealing device, and the runner and a second space between the intermediate sealing device, the cover and the main shaft. Exhaust passages are provided in communication with the first and second spaces for exhausting compressed air during changeover from one operation to another. The second space exhaust passage is capable of communicating with a lower pressure runner. The intermediate sealing device and the exhaust passages prevent water at the pressure of the highest pressure runner from communicating with the main shaft sealing device.

REFERENCES:
patent: 3237565 (1966-03-01), Hartland
patent: 3516757 (1970-06-01), Baumann
patent: 3927951 (1975-12-01), Mitsuhashi
patent: 4179237 (1979-12-01), Ogiwara et al.
patent: 4406577 (1983-09-01), Ichikawa
patent: 4468167 (1984-08-01), Ogiwara et al.
patent: 4547123 (1985-10-01), Ichikawa

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