Patent GB-353945-A (GB)
Title: Improvements in or relating to refrigerating apparatus
IPC: F25B17/00
Filed: 1930-04-29
Abstract: 353,945. Refrigerating ; valves. FRIGIDAIRE CORPORATION, 3rd National Building, Dayton, Ohio, U.S.A. -(Assignees of Smith, H. F.; Rural Route 11, Dayton, Ohio, U.S.A.) April 29, 1930, No. 13168. Convention date, Sept. 13, 1929. [Class 29.] Absorption systems.-The generator-absorber 58, Fig. 1, of a reversing system without valves in the refrigerant circuit is located in a vessel 70 forming part of a closed-cycle system containing a volatile fluid, e.g. ethyl chloride, through which heat is transmitted to the generatorabsorber from a burner 82 during the generating period and which serves to cool the generator-absorber for . the absorption period. The operation is controlled automatically, the cooling water being employed in an ejector 94 to maintain a vacuum in a control system, which is vented when a certain pressure is reached in the closed-cycle heat transfer system. .Constructions of generator-absorber and a combined condenser for refrigerant and heat transfer fluid - are described. The heat-transfer system includes a conduit 76 leading from vessel 70 to a valve ohamber 86, a conduit 78 from the valve chamber to a condenser member 74, and a return pipe 80 for liquid medium. The refrigerating system comprises the generator-absorber, pipe 60, condenser member 56, pipe 64, receiver 66 and evaporator pipes 68 depending from the receiver. The condensers are cooled by water flowing through the coil 62, pipe 92, valve chamber 142, the ejector 94, and coil 90. The vapour pressure of the refrigerant acting through a bellows 156 moves a lever 146 to open a valve 144 in the water valve chamber, and the vacuum produced by the flow of water in the ejector collapses a bellows 132 to admit fuel to the burner and a bellows 100 to close a valve 84 in the heat transfer system. Due to the heating action some of the liquid heat transfer medium is driven up the pipe 80, and vapour pressure is developed in the vessel 70, while the refrigerant is evolved in the generator-absorber. The vapour pressure in vessels 70, 74 is eventually sufficient to expand a bellows 112 and through a lever 114 open a vent valve 124 in the vacuum system, at the same time opening valve 84 in the pipe 76. The fuel valve thereupon closes, and an absorbing period ensues. The heat transfer vapour is now free to pass into vessel 74 and is condensed and flows down pipe 80 back to the vessel 70, a continuous evaporation and condensation of the medium taking place while heat of absorption is being removed. The refrigerant pressure in bellows 156 will drop and the water valve 144 will be closed. A weighted vent valve 170 allows a slight amount of air to enter the vacuum system while the ejector is working, and the control is adjusted by a cam 162 and spring 160 on the lever 146 according to the refrigerant pressure and temperature desired. The lever 146 is surrounded by a packing bellows 150. The generator-absorber is fitted with spaced dished plates G14, Fig. 6, surrounding a central perforated tube (not shown). A solid absorbent such as strontium chloride is used and is packed between the plates. The combined condenser structure comprises an insulated drum C10, Fig. 4, which corresponds with the condenser chamber 74, Fig. 1, for the heat transfer fluid, and intertwined coils C34, C24 for the refrigerant and cooling water respectively. A stop valve C52 at the inlet C46 of the refrigerant coil C34 is carried by a diaphragm C50 and may be forced by a screw C54 against a projecting deformable valve seat C48. A similar valve C60 for charging may be fitted at the upper end. The entrance of warm heat transfer fluid to the drum causes vaporization of some refrigerant in the coil C34 and this exerts a pressure to force liquid refrigerant to an evaporator located above the condenser., The Specification as open to inspection under Sect. 91 (3) (a) comprises also an insulated refrigerant receiver arranged below an evaporator of drum form. It may be charged initially with liquid refrigerant so that any uncondensed refrigerant flowing past the condenser cannot reach the evaporator. As the generation and condensation proceed the charge is forced upwards into the evaporator, while at the beginning of the absorption period evaporation commences in the receiver. This subject-matter does not appear in the Specification as accepted.