| 摘要 |
PURPOSE:To prevent malfunction of a vane and incomplete compression of a vane type compressor by feeding gas in a working chamber into a vane back pressure chamber when starting under such condition as the differential pressure between high and low pressure sides is low. CONSTITUTION:Upon start of a compressor under such condition as the differential pressure between high and low pressure sides is low, a vane 4 will spring out to lower the pressure in a vane back pressure chamber 17 to feed gaseous fluid from a working chamber 8 through the second gas supply path 27, a path 31 constituted with the side path of a valve body 30 and a first gas supply path 26 into the vane back pressure chamber 17 thus to assist spring out of the vane 4. After starting, the pressure at a high pressure side in the working chamber 8 will rise to increase gas flow in the first and second gas supply paths 26, 27 thus to increase the resistance functioning against the valve body 30 which is seated hydraulically in a valve seat 29. Consequently, lubricant is fed through a lubrication path 18 and a spherical body 21 to the vane back pressure chamber 17. |
