APPLYING DEVICE FOR VANE BACK PRESSURE IN SLIDING VANE TYPE COMPRESSOR

摘要

PURPOSE:To properly control a vane back pressure, by providing a valve, which controls an amount of lubricating oil by a shape memory alloy made spring, in a supply oil passage through which a vane back pressure chamber communicates with an oil reservoir part of a high pressure chamber. CONSTITUTION:A control valve 26, which controls an amount of lubricating oil, is provided in a supply oil passage 18 through which a vane back pressure chamber communicates with reservoir oil in a high pressure chamber 14. The control valve 26 is constituted of a piston 27, shape memory alloy made spring 28 and a bias spring 29. The valve 26, which large increases a passage area in the supply oil passage 18 even when a compressor is started from its high and low pressure equalized condition, enables lubricating oil, necessary for pressing a vane, to be supplied with no pressure drop, and the vane can be prevented from its disorder phenomenon and/or improper compression phenomenon.