Patent GB-285817-A (GB)
Title: Improvements in or relating to absorption refrigerating machines
IPC: F25B15/10
Filed: 1928-02-18
Abstract: 285,817. Hoover, Ltd., (Assignees of Smellie, D. G.). Feb. 21, 1027, [Convention date]. Refrigerating, absorption systems for. - In systems wherein cold is produced by evolution of ammonia or other refrigerant from solution into an inert gas, the gas mixture and solution circulate in separate single circuits, and means are provided for maintaining a difference in concentration in parts of the solution circuit. Circulation mav be effected by pumps, or by heating only. The system shown in Fig. 2 comprises a cold generator 20 heated by the substance to be cooled, a main absorber 21, an auxiliary generator 31 heated by an external source 33, a separator 34 and an auxiliary absorber 32. The inert gas and refrigerant vapour flow between the cold generator and main absorber through pipes 24, 23, the latter pipe being formed into an inverted U, of which one limb 39 is heated by waste heat from the heater 33, while the other limb 40 is air cooled, to effect a circulation of the gas. The gas evolved from the auxiliary generator passes from the separator 34 to the auxiliary absorber, which is supplied with strong liquor from the main absorber through a pipe 25 and feeds the cold generator. Weak liquor flows from the separator to the main absorber by a pipe 36. A similar system is described in which the U-tube is replaced by a positive gas-circulating pump. In a further system, shown in Fig. 4, a second generator 43 arranged immediately below the main generator 20 and inside a wall 53 of a cabinet is supplied with weak liquor through a pressure-reducing valve 44. The gas evolved in the second generator is delivered by a pump 45 partly through a valve 55 into the second absorber 47 and partly to a jet 54 to induce flow of gas in the conduits 24, 23. The weak liquor is circulated by a pump 50 from the second generator through a pipe 51 into the main absorber 21, and the reconstituted liquor flows by gravity from the main to the second absorber and thence to the main generator. In a modification of this form, the jet inducer is replaced by a positive gas pump. Another system without pumps or valves is shown in Fig. 7. The second generator is in the form of a riser coil 57 heated by an electric element 58, and delivers gas and liquid to a separator 59. The gas flows partly to a jet 54 in the inert gas circuit and partly by a pipe 63 to a cooled riser coil 56 forming the second absorber. The liquid flows from the separator through pipe 62 to the main absorber and thence by pipe 25 to the second absorber, the lower one being normally sealed by liquid but adapted to allow gas to pass therethrough to relieve undue pressure in the separator. An open-ended pipe may be arranged within the gas outlet pipe 60, through which liquid sucked into the separator from the pipe 62 at starting may rise and then overflow back into the separator instead of passing to the main generator. When pumps are used they may be arranged together with their driving motor in a single sealed unit without external bearings. The apparatus may operate at pressures near atmospheric. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the following :- In a system with only one generator 20, Fig. 2, (Cancelled) and one absorber 21, circulation of the gas and liquor is effected by pumps 28, 29, 30, and the liquor conduits are formed into an interclanger. Apparatus comprising several machines connected in series may be employed, and fitted to a refrigerating-cabinet, as set forth in Specification 306,833. This subject-matter does not appear in the Specification as accepted.