GB710068A - Improvements in absorption refrigerating apparatus - Google Patents

Abstract

710,068. Absorption refrigerating systems. ELECTROLUX, Ltd. Dec. 5, 1952 [Dec. 6, 1951; Dec. 6, 1951], No. 30913/52. Class 29 The conduits of. the expeller or boiler system are so disposed as to allow unobstructed application of cup-shaped vacuum insulation vessels 14, 15 to the boiler either from above or below. The liquid heat-exchanger 13 may also be enclosed in the vacuum vessel. As shown in Fig. 1, the vapour outlet pipe 24, 25 is bent downwardly so as to be adjacent to the inlet 19 of the liquid heat-exchanger, and the electric leads 12 for the heating cartridge enter at the same level, thus leaving the top and bottom of the boiler unobstructed so that the vacuum vessels 14, 15 can be applied from above and below and the gap between them bridged by a flexible insulating sleeve 18 with passages for the conduits. The inner walls of the vacuum vessels are provided with a reflecting coating. The inner tube 20 of the liquid heat-exchanger 13 supplies rich liquor to the expeller tube 21 welded to the heating pipe 10. The pump tube 22 pumps weak liquor from the bottom of the expeller tube 21 to the limb 23 of an inverted U-tube 23, 24 also welded to the heating pipe and connected with the outer tube of the liquid heat-exchanger. Vapour from the expeller tube 21 and the weakliquor pipe 23 passes by pipes 24, 25 to the condenser, and any condensate precipitating in the pipes 24, 25 is vented to the expeller 21 through a pipe 26. Fig. 2 shows a modification in which the liquid heat-exchanger 13 is arranged within the vacuum insulation vessel 14 and has its inner tube 20 welded to the heating pipe 10 at 27 so that rich liquor is pumped to the vapour conduit 24, from the bottom part 21 of which it is pumped by pump pipe 22 to the expeller tube proper 23 welded to the heating pipe and connected at its lower end to the outer pipe of the liquid heat-exchanger.. Vapour expelled in the tube 23 passes downwardly through pipe 24 where it is analysed by the rich solution and through a helical conduit 28 arranged inside the' convolutions of the heat-exchanger 13 to the vapour conduit 25. A drainage pipe 26 connects the vapour conduit to the part 21. Two electric heaters are used in series, a low temperature heater for the pump 22 and a higher temperature heater for the expeller 23. The part 21 of the conduit 24 can be arranged in heat-conductive relation with the heating tube 10 to form an expeller. The upper or lower vacuum vessel may be omitted and ordinary insulation used. In a further modification the liquid heatexchanger is formed of two U-shaped conduits welded together or arranged concentrically. The heating cartridge may be inserted from above, the leads passing through a guide channel free from the upper vacuum vessel so that this may be readily removed for replacement of the cartridge, which may be formed in two spaced sections, one heating the expeller tube and the other the pump pipe.