Oil-free screw compressor coated with a base resin, a solid lubricant and a heat-resistant additive
AssigneesHitachi Industrial Equipment Systems Co., Ltd., Kawamura Research Laboratories, Inc.
InventorsYukiko Ikeda, Kazuaki Shiinoki, Masakatsu Okaya, Natsuki Kawabata, Masahiro Kawamura, Iwao Aoki
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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.
Claims19
A solid lubrication heat resistant coating comprising:
- 50 to 70 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- 2 to 7 wt % of a heat-resistant additive comprising Aluminum oxide, the heat-resistant additive dispersed in the resin,
- wherein the solid lubrication heat resistant coating is uniformly applied without separation at a temperature between 260° C. and 398° C.
A solid lubrication heat resistant coating comprising:
- 50 to 70 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- 2 to 7 wt % of a heat-resistant additive comprising Titanium oxide, the heat-resistant additive dispersed in the resin,
- wherein the solid lubrication heat resistant coating is uniformly applied without separation at a temperature between 260° C. and 398° C.
A solid lubrication heat resistant coating comprising:
- 50 to 70 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- 0 to 4 wt % of a heat-resistant additive comprising Silicon nitride;
- and
- a heat-resistant additive comprising Titanium oxide, wherein the heat-resistant additive comprising Titanium oxide and the heat-resistant additive comprising Silicon Nitride are additives dispersed in the resin,
- wherein the solid lubrication heat resistant coating is uniformly applied without separation at a temperature between 260° C. and 398° C.
A coating varnish, comprising:
- 50 to 70 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- 2 to 7 wt % of a heat-resistant additive comprising Aluminum oxide, the heat-resistant additive dispersed in the resin,
- wherein the coating varnish is uniformly applied without separation at a temperature between 260° C. and 398° C.
An oil-free screw rotor, comprising a coating of:
- 50 to 70 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- 2 to 7 wt % of a heat-resistant additive comprising Aluminum oxide, the heat-resistant additive dispersed in the resin,
- wherein the coating is uniformly applied to the oil-free screw rotor without separation at a temperature between 260° C. and 398° C.
An oil-free screw compressor, comprising a coating of:
- 50 to 70 wt % of a base resin containing an imide bond;
- 15 to 35 wt % of a solid lubricant comprising Molybdenum disulfide;
- and
- 2 to 7 wt % of a heat-resistant additive comprising Aluminum oxide, the heat-resistant additive dispersed in the resin,
- wherein the coating is uniformly applied to the oil-free screw compressor without separation at a temperature between 260° C. and 398° C.
Dependencies are inferred from the claim text.