Pumps – Motor driven – Electric or magnetic motor
Patent
1991-05-30
1992-11-24
Smith, Leonard E.
Pumps
Motor driven
Electric or magnetic motor
418178, 418179, F04B 3504, F04C 2900
Patent
active
051658704
ABSTRACT:
A rotational speed variable type refrigerant compressor includes a closed vessel in which a refrigerator oil is received and stored, a rotational speed variable type motor mechanism and a compressing mechanism driven by the motor mechanism to compress a refrigerant. The compressing mechanism includes a slidable part which comprises a first slidable member made of a ferrous material with a nitrided layer composed of an iron nitride as a main component formed on the surface thereof and a second slidable member made of a ferrous material with an iron oxide layer composed of Fe.sub.3 O.sub.4 as a main component formed on the surface thereof along which the first slidable member comes in slidable contact with the second slidable member. For example, a shaft is constituted by the first slidable member. In addition, for example, each of the bearings for rotatably supporting the shaft is consituted by the second slidable member. Since the slidable part is constituted by combinative employment of the first slidable member and the second slidable member, an occurrence of abnormal wear between the first slidable member and the second slidable member can be prevented even when a film of lubricant therebetween is undesirably broken.
REFERENCES:
patent: 3712767 (1973-01-01), Beutter
patent: 3747944 (1973-07-01), Roy et al.
patent: 4225294 (1980-09-01), Kakuwa et al.
patent: 4944663 (1990-07-01), Iizuka et al.
patent: 5087181 (1992-02-01), Kamitsuma et al.
Wear, 108 (1986) pp. 375-384, Kang et al: The "Breaking-In" of Lubricated Surfaces.
Kabushiki Kaisha Toshiba
Smith Leonard E.
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