Patent GB-231521-A (GB)
Title: Improvements in refrigerating apparatus of the absorption type
IPC: F25B39/02
Filed: 1925-03-28
Abstract: 231,521. Platen-Munters Refrigerating System Aktiebolag. March 29, 1924, [Convention date]. Refrigerating, absorption apparatus for.-In apparatus working on a continuous cycle and having an inert gas circulating between the evaporator and absorber to equalize the pressure throughout the system, the evaporator and the absorber are fitted with heat - conducting trays, plates or baffles providing surfaces over which the liquefied refrigerant in the evaporator or the liquor in the absorber may flow in films, while channels for the inert gas or the mixture of inert gas and refrigerant vapour are provided between and through the surfaces, whereby exchange of heat and absorption are facilitated without undue obstruction of the flow of gas. The evaporator may comprise a shell 2, Fig. 2, having external radial ribs 12, and fitted with plates 9 spaced apart by rings 13. The liquefied refrigerant from the condenser enters by a passage 4 at the top and flows through openings 14 in the plates, these openings being set angularly in relation to each other from one plate to the next so as to provide a tortuous passage for the inert gas, which enters from the absorber through a pipe 5 and is carried downwards by diffusion in the heavier evaporated refrigerant, the mixture passing back to the absorber through an outlet 6. A modified form of plate comprises a disc 9, Fig. 5, having struck-out. tongues 16 which provide openings 15 and are bent down to form spacers, the rings 13 then being dispensed with. A further form of plate comprises a disc 9, Fig. 6, having an opening 17 at one side for the liquid and a central opening 18 for the gas, the opening 17 having an upwardly directed flange 20 to maintain a layer of liquid on the plate and the central opening having a higher flange 19 to prevent overflow of liquid into the gas passage. A zone of plates having such separate openings for liquid and gas may alternate in the same vessel with a zone of plates having common liquid and gas openings. The plates may have openings at the periphery, or may consist of inverted shallow dishes, the rims of which serve as spacers. In place of superposed plates, a continuous helicoidal surface 23, Fig. 11, may be used. Preferably it is fitted radial ribs 27 to maintain a layer of liquid on the plate. It may be secured to or fitted on a central cylinder 25, or the cylinder may be omitted to provide a gas passage. The discs 9, the rings 13, or the helicoidal plate may be fitted into the shell when the latter is hot, so that a secure heat-conducting connection is obtained when the shell shrinks on cooling. The Specification, as open to inspection under Sect. 91 (3) (a), comprises also a modified form of vessel serving an an absorber. The lower plates 10, Fig. 13 (Cancelled), have flanged openings 32 serving for both liquor and gas, while the upper plates 30 have openings 31 for the passage of liquor, which is delivered from the generator by the pipe 7, and central openings 28 connected by flanges 29 so as to form a closed exit passage for the gas, which is thus kept out of contact with the liquor. The vessel has a cooling-water jacket 33, a strong-liquor outlet 8, and inlet and outlet passages 6, 5 for the gas mixture and the inert gas. This subject-matter does not appear in the Specification as accepted.