| 摘要 |
PURPOSE:To prevent the actuation of a pressure switch from being influenced by the operated state of an oil pump by providing this pressure switch for detecting the pressure of the suction side as the low pressure side and the pressure of an oil passage for circulating lubricating oil between an oil filter and the oil pump as the high pressure side so as to be actuated by differential pressure between both detected pressures. CONSTITUTION:A second pressure switch 1 detects the pressure of a suction passage 19 as the low pressure side and the pressure of an oil passage 18 between an oil filter 15 and an oil pump 16 as the high pressure side, and starts the oil pump 16 in the case of differential pressure between both pressures being less than the set value. Even when differential pressure between the suction pressure and discharge pressure of a compressor body 11 becomes out of the normal value to obtain the self-lubricating state by this differential pressure and the oil pump 16 is stopped by manual operation which results in lowering oil feed pressure to the compressor body 11, this has no influence on the differential pressure of the second pressure switch 1. Also since it is so formed that manual operation cannot be performed in the turned-on state of the second pressure switch 1, whether differential pressure between the suction pressure and discharge pressure is over the normal value can be confirmed by this. At the oil feed pressure lowered time, the oil pump 16 is restarted.
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