Oil-free screw rotor apparatus

Details Oil-free screw rotor apparatus Oil-free screw rotor apparatus

2000-02-11

2001-10-16

Denion, Thomas (Department: 3748)

Rotary expansible chamber devices

Interengaging rotating members

Helical or herringbone

C418S098000, C418S152000, C418S203000, C418SDIG001, C184S006160, C384S114000, C384S322000, C384S400000

Reexamination Certificate

active

06302667

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to a screw rotor machine, and in particular to a screw rotor compressor.
Screw rotor machines are chiefly used as compressors for compressing gas, normally air, and to a lesser extent for expanding a compressed gas.
U.S. Pat. No. 3,975,123 teaches a screw compressor whose screw rotors are lubricated, cooled and sealed with water. The rotor trunnions are mounted on bearings that are lubricated with oil in a conventional manner.
The drawback with this construction is that axial seals between the oil-lubricated part and the oil-free part can burst or oil can leak to the oil-free part in some other way. An oil leakage of this nature will contaminate the gas with oil.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a screw rotor machine in which the gas to be compressed or expanded will not be contaminated by oil from the bearing housings.
Another object is to provide a screw rotor machine whose bearings are lubricated and cooled without the use of oil and which is totally oil-free.
These objects are achieved with a screw rotor machine that has water-lubricated bearings and rotors. The bearing lubricant used is purely water that contains no additives, or water to which there has been added a freezing-point depressing agent, a viscosity-raising agent and/or a corrosion-inhibiting agent.
According to one preferred embodiment of the invention, the screw rotor machine includes a slide thrust bearing that acts both hydrodynamically and hydrostatically in one of each of the rotor bearing housings, wherein that part of the slide bearing located nearest the shaft is in fluid connection with a lubricant source via a radial slide bearing or plain bearing, while the opposite part of said thrust bearing is in connection with a working chamber or with the machine gas inlet.


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