GB1438489A - Apparatus for use as a gas compressor or gas blower - Google Patents

Abstract

1438489 Reciprocating compressors; balancing CARDING SPECIALISTS (CANADA) Ltd 5 July 1973 [11 July 1972] 46708/75 Divided out of 1432552 Headings F1M and F1N In a gas compressor, Fig. 1 comprising a piston 9 reciprocable and rotatable in a cylinder 2, the piston being provided with conventional pressure operated valves or valves in the form of peripheral grooves 10, 11 (13), 14 arranged to register sequentially with outlet ports 7, 8 and inlet ports (5, 6) to control the flow of gas into and out of the cylinder on one or opposite sides of the piston 9, the piston 9 is reciprocated and rotated by rotating a shaft 16 carrying the piston, the rotation of the shaft causing double-lobed cams 19, 20 fixed thereto to co-operate with rollers 24, 28, 29 30 rotatably mounted on the cyliner 2, thereby to cause reciprocation of the piston. The compressor shown in Fig. 4 is of the two-stage double-acting type comprising high and low pressure pistons (152, 153) fixed on a hollow shaft (133) and reciprocable and rotatable respectively in low and high pressure cylinders 67, 68. External ducts 76-78 and an intercooler (not shown) interconnect the two cylinders. Details of the construction of the cylinders 67, 68, their pistons (152, 153) and the sealing and mounting of the shaft (133) are depicted in Fig. 8 (not shown). To cause the pistons to reciprocate cams 165, 166 on opposite ends of the shaft co-operate with a respective roller assembly 84, 85, each assembly being pivoted to a lug 87 on the adjacent cylinder end. Fuller details of the roller assemblies are disclosed in Figs. 6 and 7 (not shown). To assist in balancing the reciprocating forces the cylinders 67, 68 are capable of limited longitudinal movement by being provided with mounting elements 57, 58 having sleeves 59-62 slidable along guide rods 54, 55. Each guide rod extends between upstanding sections 52, 53 mounted on a base 51. The compressor is driven through a pulley 170 mounted on a shaft 168 and a coupling 167 (see Specification 1432554 Division F2) which allows reciprocation of the compressor shaft (133). An alternative arrangement for assisting the balancing is described, Fig. 10 (not shown), in which a free piston (203) slides inside the shaft (133) and is acted upon by hydraulic fluid in end chambers variable in volume by movement of the shaft.