GB249873A - Improvements in or relating to refrigerating apparatus - Google Patents

Abstract

249,873. Roos, G. March 28, 1925, [Convention date]. Refrigerating, absorption machines for.-In a continuous cycle system wherein an inert gas such as air is present in the absorber and evaporator, the strong liquor returning from the ahsorber is lifted by the pressure of the generated vapour from a valved chamber at the bottom of the generator to a height above the main level of liquid in the generator. The flow of liquor into the bottom chamber takes place intermittently when the pressure in this chamber is momentarily equalized with that in the main part of the generator. In the apparatus shown in Fig. 1 liquor flows from the combined absorber and evaporator vessel 2 through a pipe 8 into a chamber 5 at the bottom of the generator 1. A valve 7 is provided in the pipe 8 and may be located within the generator. The liquid flows over perforated shelves 27 in the chamber 5, and when sufficient accumulates to cover the lower ends of riser pipes 6 the valve 7 is closed and the liquor is forced up these pipes to the top of the generator, where it falls through similar perforated plates 27. When the ends of the pipes 6 are again uncovered the pressures in the chamber 5 and generator are equalized and the valve 7 opens to admit more liquor. The vapour generated parses through a pipe 3 and condenser 4 to the top of the absorber-evaporator. This vessel is fitted with a perforated annular gutter 22 and a spiral gutter 23 or shelves to facilitate evaporation of the condensate, and with a series of perforated trays 24 through which falls the weak liquor supplied through a pipe 9 from the generator. The strong liquor collects in a tray 26 leading to the return pipe 8. In the arrangement shown in Fig. 2, a separate absorber 20 and evaporator 19 are employed. The chamber 5 at the bottom of the generator is fitted with a cup 11, from which rises a pipe 12, and with another riser pipe 13 having a valve 14 at the bottom, the pipe 13 rising to a less height than the pipe 12. The chamber 5 communicates through passages 16. 17 with a chamber 15 to which the strong liquor returns through the pipe 8 and valve 28. Assuming the chambers 5, 15 to contain liquor at the same level, on heating the chamber 5 the liquor is forced up the pipes 12, 13, and the cup 11 is emptied prior to the chamber 5, so that a pressure equalization takes place, and more liquor enters the chamber 15. The liquor is retained in the pipe 13 by the valve 14. The liquor first fills the chamber 15, owing to the small bore of the passage 17, and then flows into chamber 5 until it fills the cup 11, after which the valve 28 is closed and the liquor flows slowly from the chamber 15 to the chamber 5 to equalize the levels. In the arrangement shown in Fig 3, the whole of the generation takes place in a vessel 30 to which liquor returns through a pipe 8 and valve 7. The liquor is forced up a riser pipe 6, whose lower end is enclosed by a pipe 29 open at both ends, into a chamber 31, to which the vapour pipe 3 and liquor pipe 9 are connected. In the separate absorber 20 and evaporator 19 shown in Fig. 2 the condensed refrigerant falls from the pipe 3 on to staggered inclined shelves 35 in the evaporator, and the weak liquor from the pipe 9 is distributed by a perforated tray 36 to the absorber. The latter is surrounded by a cooling jacket. The absorber and evaporator communicate through a passage 32 at the top and open at the bottom into a chamber 18 from which the strong liquor is returned to the pipe 8. The neutral gas sinks in the absorber and rises with the vapour in the evaporator, as shown by the arrows. Specifications 212,572 and 214,247 are referred to.