Patent GB-237343-A (GB)
Title: Improvements in vacuum producing apparatus of the ejector condenser type
IPC: F04F5/46
Filed: 1924-04-23
Abstract: 237,343. Forselles, A. J. L. af. April 23, 1924. Conveyer apparatus, ejector; ejector-condensers; regulating or controlling action; strainers.- Relates to a vacuum-producing apparatus of the vertical ejector type, in which an upper vacuum vessel that communicates with the vessel to be exhausted has a contracted ejector nozzle through which water under pressure is delivered and passes into a vacuum chamber at the bottom of the apparatus. Between these two chambers are arranged in series one or more other vacuum chambers which taper downwardly and which are each continued downwardly by a nozzle extending into the next lower chamber, each of the chambers closing tightly with their upper walls against the nozzle therethrough and each chamber communicating through conduits with the vessel or vessel to be exhausted. Preferably, the peripheral portions of the consecutive drums are arranged in spaced relation to each other, as shown in Fig. 1. Water for the ejector is supplied through the pipe 1 which has lateral openings 61 and an ejector nozzle 5 positioned at the base of the upper main vacuum chamber 60. The jet from the nozzle first enters a funnel-shaped bowl 6 that is open at the top, and then passes successively through the drums 8, 10 into the lower cylindrical drum 12 by means of the nozzles 7, 9 and 11 respectively. The nozzles increase in diameter, whereas the drums decrease in diameter the further down the drums are situated. The drums are surrounded by a cooling jacket 66 filled with water. An outlet pipe 13 leads from the drum 12 to discbarge the fluids through one or more S-shaped pipes having condensing apparatus 14 with dished rings 25. The ejector device is connected through a pipe 20 with a gas-condensing and water-accumulating reservoir 18 connected to a lower reservoir 19. The pipe 20 leads to a pipe 21 above the main chamber 60, and from the pipe 21 there are pipe connections as shown, with the chambers 60, 8, 10. 12 and 14, each of these pipes being provided with suitable valves. The cooling coil 37 which surrounds the chamber 18 is in communication with the cooling chamber 66. When the device is set into operation all the valves are kept open, but subsequently the valves 23, 27 are closed so that the vacuum is caused to rise to a maximum in the top part of the apparatus. The inlet opening of the ejector nozzle 5 is then reduced by actuating the worm-gear 65. A sluice valve 45 is provided in the pipe 14, which is operable by toothed gearing 46 and crank 47 to cause the water to flow directly downwards. When the valve 45 is closed, the ejector-fluid is caused to eddy in the lower part of the drum 12. The lower drum may have curved walls surrounded by a cooling coil. Several forms are described of the throttle device 55 for adjusting the passage for the water jet of the ejector. In Fig. 4, the disc 62 has a central opening and piston-like elements 48 bearing against oblique surfaces 63 of an adjusting ring 62, whereby the water passage to the ejector nozzle is expanded or contracted by operating the worm-gearing 65. The drums may be air-cooled. A strainer 16 is provided in the upper part of the main chamber.