Patent GB-300589-A (GB)
IPC: F25B15/10
Filed: 1928-11-15
Abstract: 300,589. Electrolux, Ltd., (Assignees of Lenning, A.). Nov. 15, 1927, [Convention date]. Refrigerating, absorption machines for; refrigerators, domestic.-The generator 15, Figs. 1 and 3, and the liquor heat exchanger 16 of an absorption machine are arranged at the base of a cabinet 12, while the absorber 20, and rectifier and condenser 19, Fig. 2, are arranged in an air channel 13, 14 extending underneath and at the side or back of the cabinet and are cooled by air. The machine described works on a continuous cycle and contains a pressure-equalizing inert gas such as hydrogen in the absorber and evaporator. The generator is provided with a central heating tube 24, Fig. 1, leading to a flue pipe 17, which serves to promote a rising current of air in the channel 14. An air inlet 84 is provided at the bottom of the flue. A cross-partition 25 in the generator provides a strongly heated chamber 26, into which extends a narrow riser pipe 29 with a small aperture 41, Fig. 3, in the side of its lower end. Liquor is lifted by the gas bubbles through the riser pipe 29 and flows back through a surrounding pipe 31 to a tube 32 fitted with apertured baffles 33 and communicating with the less strongly heated part of the generator. The evolved refrigerant gas passes out of the pipe 31 by a pipe 42 leading to the rectifier, while weak liquor flows out of the generator by a pipe 37, thence through the interchanger 16 and pipe 38, Fig. 3, to the top of the absorber. Strong liquor returns through a pipe 39, interchanger 1G, and pipe 40 to the chamber 26 of the generator. The rectifier and condenser 19 comprises tubular members provided with external gills 47 and with internal apertured baffles 48, and slightly inclined to the horizontal as shown. Solvent vapour is condensed in the part 45 of the upper tube, and may flow back through the apertures or through peripheral notches in the baffles. Uncondensed gases flow on through an inner fitting 49 of the upper tube, and condensed refrigerant flows outside this fitting and through a connecting pipe 53 to the middle of the lower tube. The refrigerant serves as a cooling medium to condense solvent vapour inside the fitting 49. The right-hand part 58 of the lower tube provides spare condenser capacity for abnormal conditions, and a vent tube 60 for the inert gas extends from it to the bottom of the absorber. The evaporator 21, Fig. 4, and absorber are fitted internally with apertured baffles, and are connected by a gas heatinterchanger comprising sinuous coils 63, 66 in metallic contact. These coils are embedded in insulating material in a closed metal casing 97 arranged in the air channel. The parts of the apparatus are supported by flat plates 67 - - 70, Fig. 1, forming an extension of the cabinet wall, and by upright angle irons 71, 72, and the plate 70 may be bent horizontally to form a flat top over the exchanger insulation. The absorber is provided with external gills 77, Fig. 3, which are turned up at their edges 78, Fig. 1, to provide parallel passages for the cooling air. It is supported by members 73, Fig. 3, on the plate 7G and on an upper plate, and a section 86, Fig. 4, of the cabinet wall carrying the evaporator is removable with the machine. Shelves 87 in a drip tray 88 are fitted in the cabinet.