| 摘要 |
<p>A device for regulating the performance of fluid machinery by regulating the revolution speed of the fluid machinery, comprising a frequency converter (48), cases (46, 47) for housing the frequency converter (48) to ensure air-tightness against the outside air, power input and output means (114, 115) provided in a case to ensure air-tightness against the outside air, and output frequency regulating means capable of regulating an output frequency, such as a rotary switch.</p> |
