Oil injected screw compressor with thrust force reducing means

Details Oil injected screw compressor with thrust force reducing means Oil injected screw compressor with thrust force reducing means

1997-10-20

2000-05-09

Vrablik, John J.

Rotary expansible chamber devices

Heat exchange or non-working fluid lubricating or sealing

With condition responsive control of non-working fluid

418203, 418DIG1, F04C 1816, F04C 2902

Patent

active

060595515

ABSTRACT:
A screw compressor capable of increasing a pressure receiving area of a balance piston, employing a thrust bearing having a large load capacity, and preventing an occurrence of a reverse thrust load state when started. The rotor shaft extending beyond both sides of screw rotors 11, 12 is rotatably supported by radial bearings 13, 14. An input shaft 15 serves as a rotor shaft on the suction side. A rotor shaft on the discharge side is rotatably supported by a thrust bearing 16 at a position farther away from the screw rotors 11, 12 than the radial bearing 14. A balance piston 17 is mounted on the rotor shaft at a position farther away from the screw rotors 11, 12 than the thrust bearing 16. A partitioning wall 31 is provided between the thurst bearing 16 and the balance piston 17. An equalizing flowpassage for directing oil from an oil reservoir of an oil separating and recovering unit provided in the discharge flowpassage without pressurizing it, is provided in a space adjacent the partitioning wall 31 of the balance piston 17.

REFERENCES:
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patent: 4964790 (1990-10-01), Scott
patent: 5207568 (1993-05-01), Szymaszek
patent: 5246357 (1993-09-01), Sjoholm et al.
patent: 5411388 (1995-05-01), Soderlund
patent: 5678987 (1997-10-01), Timuska

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