| 摘要 |
1,219,348. Reciprocating compressors. GENERAL ELECTRIC CO. Dec. 13, 1968 [Dec. 20, 1967], No. 59357/68. Heading F1N. [Also in Divisions F4 and H2] A hermetically sealed refrigerant motor compressor unit contains dichlorodifluoromethane as refrigerant and has motor windings of aluminium wire insulated by a heat hardened phenol, formaldehyde modified polyvinyl formae resin, the unit also containing a zinc dialkyldithiophosphate in an amount sufficient to inhibit degradation of the insulation by the refrigerant. The unit has a sump for lubricant to which the zinc dialkyldithiophosphate is added in the proportions of 0À1 to 3% by weight. The alkyl radicals may be the same or different and each contain from six to eight carbon atoms.
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