Patent GB-743550-A (GB)
Title: Improvements in or relating to refrigerating apparatus
IPC: F04B39/16
Filed: 1953-06-04
Abstract: 743,550. Refrigerating. SOC. ANON. DES USINES CHAUSSON. June 4, 1953 [March 9, 1953], No. 15436/53. Class 29.  Oil and gaseous refrigerant from the evaporator of a compression system flow into an enclosure adapted to be partly filled with oil and the oil and refrigerant are constrained to flow through an element of sintered material before passing to the compressor suction. As shown in Fig. 1, vapour with entrained lubricant enters a horizontal tube 5 by a connection 17 and control valve 16. The lubricant is deposited in the tube 5, in which foaming is prevented by a cloth or metal grid 19, and then drains into a container 12 through a small aperture 14 to saturate a cartridge 11 of sintered material e.g. bronze. The vapour enters the container 12 through a large hole 13 and sweeps through the cartridge 11 to be filtered and to entrain lubricant therefrom and carry it to the compresser by suction conduit 9. The compressor discharges through a control valve 23 and a pipe 26 into the upper part of a casing 1 through which the tube 5 passes. The hot gases condense on a water or other finned cooling coil 20 and the condensate falls into the bottom of the casing to be cooled by the cold vapours passing through tube 5. The condensate then enters a dehydrating cartridge 32 by perforated ends 33 and passes through a filter comprising a socket 31 made of sintered material to the pipe 28, 29 leading to the expansion valve. Valve 23 has further connections 24, 25, 23a leading to a pressure sensitive device controlling the compressor motor, a pressure gauge and a source of refrigerant when charging is being carried out. Connection 23a may also be used for purging non- condensable gases from the system. Oil can be supplied to the system through a connection 17a. As shown in Fig. 3, mixed vapours and lubricant from the evaporator enter a bell 57 through a connection 61 and the lubricant flows to a diaphragm 52 of sintered material through a small hole 55 in a wall 54. The shell includes a foam-preventing grid 78 and the vapour passes through a large hole 56 in the wall 54, sweeps through the filter diaphragm 52 to pick up lubricant and passes to the compressor suction through connection 53. Liquid refrigerant from the condenser enters a casing 1, into which bell 57 projects, through a port 64 so as first to impinge the bell 57 and thus be cooled. The liquid then passes through a dryer 71 held in place by a resilient member 77 and then passes through a notch 43 in a wall 41 and a filter diaphragm 39 of sintered material to a connection 46 from which it passes to the expansion valve. A pressure gauge can be connected to a port 62 in bell 57 and non-condensible gases or excess refrigerant can be removed by a pipe 66 opening into the upper part of casing 1. Casing 1 is slightly inclined so that notch 43 is located at its lowest point. As shown in Fig. 7, mixed vapour and lubricant from the evaporator enters a casing 79 by a pipe 100 and the lubricant saturates a tube 91 and diaphragm 88 both made of sintered material. When the level of lubricant falls, a baffle 95 surrounding the lower part of tube 91 prevents the lubricant directly contacting the tube but a restricted flow takes place through aperture 98. The vapours pass through the material of the tube and diaphragm to entrain lubricant and then pass to the suction conduit 86. The device may be recharged or the pressure at the suction of the compressor may be altered by a connection 101.