Screw compressor
AssigneesHitachi Industrial Equipment Systems Co., Ltd., Kawamura Research Laboratories, Inc.
InventorsYukiko Ikeda, Kazuaki Shiinoki, Masakatsu Okaya, Natsuki Kawabata, Masahiro Kawamura, Iwao Aoki
Life of this patent
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Abstract
In order to prevent deterioration in performance of an oil-free screw compressor and scuffing caused by rust, surfaces of both male and female rotors are coated with heat-resistance coatings containing a solid lubricant. A coating contains Polyimide resin to which Molybdenum disulfide, as a solid lubricant, and Aluminum oxide and Titanium oxide, as additives, are added. Accordingly, it is possible to realize a coating that is higher in heat resistance and longer in lifetime than a conventional one.
Claims18
A solid lubrication heat-resistant coating comprising:
- at least 50 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- and 4 to 14 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Aluminum oxide and Titanium oxide at a ratio of 3:7 to 7:3.
A solid lubrication heat-resistant coating comprising:
- at least 50 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- 8 to 15 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Titanium oxide and Silicon nitride dispersed in a range of 4% or less.
A coating varnish comprising:
- a solid lubrication heat-resistant coating diluted with a solvent, the solid lubrication heat-resistant coating comprising at least 50 wt % of a base resin containing an imide bond, 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide, and 4 to 14 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Aluminum oxide and Titanium oxide at a ratio of 3:7 to 7:3.
A coating varnish comprising:
- a solid lubrication heat-resistant coating diluted with a solvent, the solid lubrication heat-resistant coating comprising at least 50 wt % of a base resin containing an imide bond, 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide, and 8 to 15 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Titanium oxide and Silicon nitride dispersed in a range of 4% or less.
An oil-free screw rotor, comprising:
- a solid lubrication heat-resistant coating formed on an outer surface of the rotor, the solid lubrication heat-resistant coating comprising at least 50 wt % of a base resin containing an imide bond, 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide, and 8 to 15 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Titanium oxide and Silicon nitride dispersed in a range of 4% or less.
An oil-free screw rotor, comprising:
- a solid lubrication heat-resistant coating formed on an outer surface of the rotor, the solid lubrication heat-resistant coating comprising at least 50 wt % of a base resin containing an imide bond, 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide, and 4 to 14 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Aluminum oxide and Titanium oxide at a ratio of 3:7 to 7:3.
An oil-free screw compressor that sucks and discharges fluid by combining a male rotor and a female rotor on outer surfaces of which spiral profiles are formed in the axis direction, comprising:
- a solid lubrication heat-resistant coatings formed on the outer surface of the male and female rotors, the solid lubrication heat-resistant coatings on each the male and female rotors comprising at least 50 wt % of a base resin containing an imide bond, 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide, and 8 to 15 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Titanium oxide and Silicon nitride dispersed in a range of 4% or less.
An oil-free screw compressor that sucks and discharges fluid by combining a male rotor and a female rotor on outer surfaces of which spiral profiles are formed in the axis direction, comprising:
- a solid lubrication heat resistant coating formed on the outer surface of the male and female rotors, the solid lubrication heat-resistant coatings on each the male and female rotors comprising at least 50 wt % of a base resin containing an imide bond, 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide, and 4 to 14 wt % of heat-resistant additives dispersed in the resin, the heat-resistant additives comprising Aluminum oxide and Titanium oxide at a ratio of 3:7 to 7:3.
Dependencies are inferred from the claim text.