Patent GB-271302-A (GB)
Title: Process and device for the automatic periodic return of the absorption medium which has passed from the absorber into the vaporiser of absorption refrigerating machines
IPC: F25B17/02
Filed: 1926-08-30
Abstract: 271,302. Hochherz, C. Aug. 30, 1926. Refrigerating, absorption machines and processes for.-Liquid absorbent carried over into the evaporator 7, Fig. 1, of a reversing system is returned to the generator-absorber 1 automatically at the beginning of each absorption period, the pipe 6 connecting the condenser 5 with the evaporator terminating in a liquid seal device 8 having a free overflow into the evaporator, so that when the absorption period commences liquid refrigerant in the seal is sucked back up the pipe 6 and simultaneously liquid absorbent is sucked from a sump 9 in the evaporator through another pipe 11. When the end of the pipe 6 is exposed to the vapour space of the evaporator no more liquid is returned and normal evaporation and return of vapour ensue. The liquid seal may be formed as a shallow trough 8 in the evaporator, and the sump 9 communicates with the evaporator proper through a small opening 10 so as to maintain a separation of absorbent and refrigerant. The pipe 11 may connect with the expulsion pipe 2, or with a return pipe 12 leading to the liquid space of the generator-absorber, or with a water separator 3<1> in the circuit of the pipe 2, the preliminary condenser 3 and main condenser 5. Several modifications are described, in which the liquid seal may be in the form of a trap outside the evaporator, and there may be a separator trap between, the generator-absorber and condenser. The evaporator may be arranged between the generator-absorber and the condenser, and the absorbent medium may be collected in a pipe system depending from the bottom of the evaporator. A liquid seal may be arranged between the upper end of the return pipe 11 for absorbent and the water separator 3<1>, to prevent the flow of pressure vapours to the evaporator through this pipe. The pipes 11, 6 may also have small apertures in them in the vapour space of the evaporator, insufficient to allow the return therethrough of the quantity of vapour necessary for full evaporation during a cooling period, but admitting sufficient vapour to ensure a balance in the columns of liquid to be sucked back. In the arrangement shown in Fig. &, a separate pipe 32 for returning the liquid refrigerant from the seal 8 is employed, and has an aperture 21. The pipe 11 has a number of apertures 26, 27, 28 at different levels surrounded by a chamber 29 having an aperture 30 communicating with the vapour space. Liquid sucked up the pipes 11, 32 is diverted by a trap 31 into a pipe 33 leading to the bottom of the generator-absorber, while vapour returns by the pipe 6, condenser 5, trap 4 and pipe 17 to the liquid space. The trap 4 contains separated absorbent and by the arrangement described it is ensured that no refrigerant liquid returns thereto. The pipe 11 is preferably led through one of the pipes 24 of the evaporator to prevent vaporization of any liquid rising therein, which might act as a lifting means on the liquid column. In a further modification, a trap is arranged between the condenser and the evaporator and a separate vapour-return pipe is provided between the seal in the evaporator and this trap. Specification 245,124 is referred to.