Patent GB-343943-A (GB)
Title: Refrigerator
IPC: F25B31/00
Filed: 1929-08-21
Abstract: 343,943. Refrigerating. PATIAG PATENTVERWERTUNGS-UND INDUSTRIE AKT.-GES., Vaduz, Liechtenstein. Aug. 21, 1929, No. 25487. Convention date, June 24. Void [Published under Sect. 91 of the Acts]. [Class 29.] The Specification describes cold-air compression machines of the reciprocating and rotary types, a condensing compression machine having reciprocating pistons in a rotary cylinder, and a refrigerating chamber and cold accumulator. A number of suitable refrigerating media which combine with lubricants are mentioned. Cold-air and like non-condensing machines; gas compressors.-In the reciprocating non-condensing apparatus, Fig. 1, the piston 15 is reciprocated by a normal connecting rod and crank on shaft 5 and also rotated by a square rod 11a working in a hollow 11b in the piston rod and driven by a worm and wheel from shaft 1, which is connected to shaft 5 by spur gearing. Ports are provided in the upper and lower parts 15a, 15b of the piston. When the piston is on the up stroke the lower piston port coincides with port A for the first half of the stroke and air is drawn in at atmospheric pressure and then expanded. On the down stroke the piston ports are in communication with ports B and C so that the air cooled by its expansion is driven from the bottom of the cylinder through port B, the refrigerating coil S and port C to the upper half of the cylinder. This is larger than the bottom in order to take any expansion due to heating in coil S and thus maintain the pressure constant. On the up stroke the upper port in the piston coincides with port D for the last half of the stroke and the air is compressed up to atmospheric pressure and then discharged. Rotary pumps; movable-abutment type.-In the rotary non-condensing machine, Fig. 3, two pairs of rotating members 27, 34 and 26, 33 are mounted on shafts 25, 31 connected by spur gears. The discs 27, 26 are attached to ported discs 36, 36a respectively and fixed ported discs 35, 35a are held against these by springs, Air is drawn in when the ports of discs 36, 35 coincide and expanded in the pump on the right and expelled through port L through a refrigerating coil, entering the other pump through port La and being expelled from this at atmospheric pressure when the ports of discs 36a, 35a coincide. The expanded air may pass into a cooling chamber, the door of which is fitted with a hand valve actuated to equalize the pressures before the door is opened. Compression machines; gas compressors; converting rotary into reciprocating motion.-In the condensing machine shown in Fig. 4 the single acting piston 58 reciprocates in the cylinder 40c which rotates together with the condenser W and evaporator K. When the piston is on the down stroke a piston port 60 coincides with a cylinder passage 61 and the refrigerating medium is drawn into the cylinder. On the up stroke these ports are out of coincidence and the medium is driven through the spring loaded valve 69 through chamber 67 to the condenser. The medium escapes through tubes 80, 81 to a nozzle 84 which restricts the outflow and a sufficient pressure for condensation is built up. The condensed medium flows to the evaporator by passage 85. A passage 62 is provided leading to the crank case to equalize pressures in the apparatus. Stationary baffles 87, 88 are provided adjacent the walls of the condenser and evaporator to improve heat exchange. The crank shaft 44 for driving the piston is held in a fork 47 held stationary by a weight 51, thus causing the shaft to be rotated by a bevel wheel 42 on it meshing with bevel teeth 41 revolving with the casing. Cold accumulators comprise brine containers having walls of extensible material or corrugated.