| 摘要 |
PURPOSE:To contrive to maintain steadily the refrigeration oil in a compressor by a method wherein the number of revolution of the compressor is controlled by the step up increasing per unit time at the starting phase of cooling or heating operation. CONSTITUTION:Initially, the number of revolution of a compressor 1 is maintained at N1 (approximate 3,000rpm) during T1min after starting of an operation. The T1min duration is required for the stabilization of the height of an oil surface in the compressor. Subsequently, the operation is maintained for T2-T1min under the number of revolution increased up to N2 (approximate 6,000rpm). Then, after T2min, the operation is controlled to increase the number of revolution up to the rated number of revolution by the step up operational process. By above step up increasing process of the number of revolution at the starting phase of the operation, the height of a refrigeration oil surface in the compressor is prevented from lowering under the allowable minimum height of the oil surface, also the oil supplying for rotary sliding parts 10a, 11a and 13a can be performed steadily.
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