Lubrication – Systems – Rotary compressor
Reexamination Certificate
1999-11-16
2001-07-31
Fenstermacher, David (Department: 3682)
Lubrication
Systems
Rotary compressor
C184S006180, C184S006120, C184S006220, C384S398000, C384S415000
Reexamination Certificate
active
06267204
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a device for the supply of a liquid under pressure to a member having at least one flow passage, through which this liquid is passing and which is kept filled up with the liquid, in a shaft suspension device of a centrifugal separator. The suspension device has a stationary casing and a unit composed of parts, which are rotatable around a rotational axis, and non-rotatable parts. The unit is resiliently supported in the casing by means of at least one elastical element in such a way that the unit during operation is admitted to oscillate relative to the casing while it is influenced by the elastical element with an essentially radially inwardly directed spring force under damping influence by the elastical element on the oscillating movements of the unit. The member forms a part of the composed unit.
BACKGROUND OF THE INVENTION
In centrifugal separators provided with a shaft suspension device of this kind the elastical element acts with a well defined radially inwardly directed spring force, which during operation strives to bring the composed unit back to a central position and damps effectively the oscillating movements of it, which can be very critical during the passage of critical number of revolutions or when heavy unbalances occur during operation. Furthermore, bearing devices of this kind often are cheaper than alternative possible solutions.
In some centrifugal separators you need to be able to supply during operation a liquid under pressure to a member forming a part of the composed unit. One example when you need this is centrifugal separators, which demand an effective cooling of the bearings. Another example is centrifugal separators, in which a gap between a stationary part and a part oscillating during operation is sealed by means of a liquid gap sealing. A third example is centrifugal separators journally supported hydraulically, in which rotating parts are supported by a carrying oil film. However, in this case the flow passage has to be throw flown by a small amount of oil, which corresponds to the amount of oil, which leaves the hydraulic bearing through leakage or the like.
SUMMARY OF THE INVENTION
The object of the present invention is to accomplish a device for the supply of the liquid under pressure to a member in a shaft suspension unit of a centrifugal separator of the kind initially described, the member having at least one flow passage, which during operation is throw flown by and is kept filled with this liquid, which makes it possible to supply liquid to the member in a simple manner with a certain controllable flow, which is made sure under overpressure.
According to the present invention this is accomplished by providing a device for the supply of liquid of the kind initially described with a first supply channel portion, which is connected to a liquid source for the supply of liquid under pressure, and which extends through the stationary casing, a second supply channel portion, which hydraulic pressure transmittingly is connected to the first supply channel portion, and which extends through the elastical element, and a third supply channel portion, which hydraulic pressure transmittingly is connected to the second supply channel portion, and which extends through a non-rotatable part in the composed unit, and which has an outlet opening in said flow passage.
Hereby, the elastical element already present in the shaft suspension device of the centrifugal separator for another purpose also is used to form an elastical supply channel portion, which makes it possible in a very simple manner hydraulic pressure transmittingly connect a supply channel portion extending through the casing, which is stationary (i.e. is not rotating and is not oscillating with the oscillating movements of the composed unit), with a supply channel portion, which extends through the non-rotating part of the composed oscillating unit.
In another embodiment of the invention there is formed in the stationary casing an inlet chamber, which is sealed off by means of the elastical element, which is annularly shaped and surrounds the rotation axis, between a part, which is connected to the casing and a part, which is connected to the non-rotatable part of the composed unit, the first channel portion having an outlet opening in the inlet chamber and the second channel portion having an inlet opening in the inlet chamber.
In a preferred variant of this embodiment of the invention the device comprises at least two annular and the axis surrounding elastical elements, which sealingly bear against a stationary part connected to the casing and against a non-rotatable annular part connected to the composed unit, the non-rotatable annular part extending between these components.
Suitably, the second channel portion is arranged in the non-rotatable portion connected to the composed unit.
REFERENCES:
patent: 3687233 (1972-08-01), Greenwald
patent: 4025130 (1977-05-01), Streifert
patent: 4527912 (1985-07-01), Klusman
patent: 4875840 (1989-10-01), Johnson et al.
patent: 5893706 (1999-04-01), Kawaguchi et al.
patent: 556981 (1974-12-01), None
patent: 0054502 (1982-06-01), None
patent: 361080 (1973-10-01), None
patent: 460458 (1989-10-01), None
Inernational Search Report
Kristensen Aksel
Nilsson Sven-Åke
Öhlander Carl Peder
Pitkämäki Jouko
Sandblom Robert
Alfa Laval AB
Fenstermacher David
Fish & Richardson P.C.
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