GB658351A - Improvements in or relating to rotary fluid compressor units - Google Patents

Abstract

658,351. Rotary compressors. INGERSOLL-RAND CO. April 13, 1949, No. 10046. Convention date, April 14, 1948. [Class 110(ii)] A multi-stage rotary compressor has high and low-pressure cylinders arranged axially, with an intermediate chamber formed by the inner heads 41, 42 of the cylinders. As shown, sliding-vane compressors 27, 104 have their crescent shaped working chambers 35, 36, Fig. 6 (not shown), displaced by 180 degrees. Oil 129 for cooling and lubricating the working surfaces is obtained from a receiver 108 into which the compressed fluid is discharged from the high-pressure cylinder 104 through a pipe 107. The fluid then flows through an outlet 136 and the oil is removed by a filter 135 and drains back to the receiver through a pipe 147. A check valve 148 prevents reverse flow of the oil. The cleaned compressed fluid is delivered through an orifice 149 which restricts the flow and allows pressure to be built up quickly in the system when the driving engine 20 is started up and thus cause early oil flow. The driving shafts 91, 92 are coupled together as by a tongue 93, to facilitate dismantling. Grooves 37, in the leading surfaces of the vanes, allow oil to pass beneath the vanes for lubrication and preventing the trapping of compressed fluid. Packing members 46 are provided in the cylinder ends. A bearing 66 holds the rotor 29 against axial'movement and a bearing 83 similarly holds the rotor 30. Inlet ports 98 in the low-pressure compressor, for the fluid. are arranged in rows in the upper surface of the cylinder 25 and discharge ports 99 lead to ports 101 and the chamber 102. The fluid enters a chamber 104 in the highpressure cylinder by way of ports '103 and is discharged therefrom through outlets into the container 108. Regulating means for the incoming fluid comprises a valve 114, suspended from a pivot 115, which is opened by fluid passing into the chamber 109 due to the suction of the low-pressure compressor. When the main discharge pressure. reaches a predetermined figure it acts through a conduit 123 upon a piston 116 to move a rod 120 and hold the valve 114 closed. Air circulated by a fan 133, driven by the engine 20, passes over a cooler 131 for cooling the oil flowing to the compressor. A filter 111 is provided on the fluid inlet.