Patent GB-537515-A (GB)
Title: Improvements in or relating to heating and cooling apparatus
IPC: F04B39/00
Filed: 1939-12-21
Abstract: 537,515. Air compressors, regulating. SPLADIS, SOC. POUR L'APPLICATION D'INVENTIONS SCIENTIFIQUES, and PELTERIE, R. ESNAULT-. Dec. 21, 1939, No. 32661. Addition to 531,631. [Class 8 (i)] [Also in Groups XXIX and XXVI] A heating and cooling apparatus as described in the parent Specification has the motor-pump modified by the provision of suction and delivery valves each comprising a crenellated opening in a partition member and a flexible lamina overlying said opening in the manner of a flap valve. In the form shown the seat member is provided with openings 13 crenellated along their inner margins and covered by a flexible plate of metal or fibrous material bonded with synthetic resin. The plates are held in position by a central screw 15 and a dowel pin 16. The plates are provided with a series of openings 141 and to increase the flexibility of the plates some of these openings may be connected by slits 17 with the outer periphery. In a modification the plates are slidably mounted on the central screw and are loaded by a star-shaped plate spring. In another form the outer margin of both ports and flexible plate are crenellated. The inlet and exhaust valves of the compressor comprise rotary valves 45, 46 housed in a block of synthetic resin material incorporating friction-reducing substances. These valves are provided with transverse passages and to prevent the segments of the valves on the high pressure side being bent by pressure a series of small passages 48 are provided. The valves are actuated by doubleacting cams taking between rollers on rock shafts linked to crank arms on stub shafts mounted in roller bearings and coupled to the valves by Oldham couplings. One cam controls all the inlet valves while a second cam controls all the exhaust valves. To prevent the pressure in the motor cylinders rising above the predetermined high pressure of the cycle, inwardly and outwardly opening relief valves are provided in the cylinder hands. These valves may be in the form of crenellated flap valves as described above. To vary the clearance spaces of the compressor cylinders the discharge valves are mounted on a cylindrical member 20 slidably mounted in a block 21 of synthetic resin material incorporating friction-reducing material. These blocks which also form a heat barrier are shaped to form flexible packing lips at 23. The members 20 are held against rotation by screws 24 engaging slots 25 and are secured to adjusting screws 26 engaged by rotatably mounted nuts supported by ball bearings 28. The nuts are rotated by spurgearing connected by radial shafts and bevel gearing to an axial shaft which may be actuated by a motor under thermo-static control. The pistons of both motor and compressor cylinders have a crown portion 8 fitted with packing rings of the kind described in Specification 272,649, [Class 122 (v)], and a cross-head portion 9 articulated to the connecting rod by needle bearings. Rollers 12 also mounted on needle bearings and with rolling surfaces of less radius than that of the cylinders engage the cylinder walls. The connecting rods 11 are connected to a disc 5 rotatably mounted on a crank pin 4. By means of gearing described in French Specification 431,261 the disc 5 is caused to revolve about the crank pin 4 at the same rate as the crankshaft 3 rotates but in the opposite direction so that any diameter always remains parallel to its starting position. Specification 385,196, [Group XXVII], also is referred to.