| 摘要 |
PURPOSE:To aim at the improvement of efficiency in a low partial load range, by adding a capacity control system using an inverter to a stageless capacity control mechanism by means of a slide valve. CONSTITUTION:Capacity control by means of a slide valve 9 is adjusted in a range of about 25-100% at stageless capacity. When the slide valve 9 exists in a position of 100-75% with a switch 12, it is driven by a commercial power source without passing an inverter 10, and when the slide valve 9 reaches to the range of 50%, it is used with power frequency with power frequency raised high at a position of the switch 12 shown in illustration via the inverter 10. In time of using the commercial power source of 60Hz as usual, when the slide valve 9 exists in a position of 50-25%, power frequency of a motor 7 is raised up to 90Hz or so, and it is used with the number of revolution in a rotor 8 accelerated up to about 5,000r.p.m. whereby a refrigerator is operated in the state that efficiency of a compressor is heightened as much as by about 5-10%. With this constitution, a sharp improvement in the efficiency of operation in time of partial load is made possible.
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