| 摘要 |
PURPOSE:To reduce the discharge capacity when the discharge pressure of a compressor becomes abnormally high, by opening and closing the unloading port for the communication between the low-pressure side and the high-pressure side of the compressor, by a plunger. CONSTITUTION:An uloading port 100 for the communication between a compression chamber Q and an intake chamber 10 is formed onto a front housing 5. A cylinder part 16 for supporting in slidable ways a plunger 101 made of brass for opening and closing the unloading port is formed. A spring 18 for urging the plunger 101 in the direction for closing the unloading port 100 is installed into the cylinder part 16. The cylinder chamber 16a on the other edge side of the plunger 101 communicates to the high-pressure side of the compression chamber Q', and the plunger 101 is slid according to the pressure.
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