Screw compressor

A screw compressor and screw technology, applied in the direction of rotary piston machinery, mechanical equipment, engine components, etc., can solve the problems of liquid refrigerant, insufficient lubrication of cylindrical roller bearings, etc., to eliminate the need to use oil, The effect of simplifying the structure and increasing the cost
CN1499080AInactive Publication Date: 2004-05-26KOBE STEEL LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
KOBE STEEL LTD
Publication Date
2004-05-26
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

In a screw compressor for a refrigerator, suction-side rotor shafts of screw rotors are supported rotatably by angular ball bearings for forward thrust load, an annular gap is formed between the angular ball bearings and a suction-side bearing casing, and outermost end faces of outer rings of the angular ball bearings are pressed through a spring member by means of a presser member fixed to an end face of the suction-side bearing casing, whereby the angular ball bearings are held movably in the thrust direction within the suction-side bearing casing. Discharge-side rotor shafts of the screw rotors are supported rotatably by angular ball bearings for forward thrust load and an angular ball bearing for reverse thrust load which are held at predetermined certain positions within a discharge-side bearing casing. A screw compressor which permits structural simplification, reduction of size, and lightening of a maintenance burden is provided.
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Description

technical field

[0001] The present invention relates to screw compressors, and more particularly to screw compressors for compressing refrigerants in refrigeration appliances. Background technique

[0002] So far, screw compressors for refrigeration applications are known, (eg US Patent No. 6183227).

[0003] Screw compressors are generally divided into oil-cooled screw compressors and oil-free screw compressors. In an oil-cooled screw compressor, oil is supplied into the rotor cavity to seal between the rotors; to seal between the rotor and the inner wall of the rotor cavity; to cool the portion whose temperature increases due to compression; and Used for lubrication. In the oil-free screw compressor, oil is not supplied into the rotor chamber, the bearing portion is completely isolated from the rotor chamber by sealing, and the synchronous gear is used to transmit rotational driving force between the female rotor and the male rotor. For the structure of the compressor b...

Claims

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