GB115862A - Improvements in or relating to Ejectors. - Google Patents

Abstract

115,862. Baumann, K. March 23, 1917. Nozzles, cones, and combining-tubes. - In ejectors of the kind in which the inducing-fluid is admitted tangentially at the centre of an annular diffuser or combining-passage so that the combined stream moves in a spiral path to the delivery outlet, the diffuser is of conical or hyperboloidal form at the part where the inlets are located, the inlets preferably being arranged so as to impart a whirling motion to the fluids where they mix. Several arrangements are described, suitable for either gases or liquids, or for mixtures. Fig. 1 shows one form diagrammatically, the inducing fluid entering through a passage 1 and issuing through tangential nozzles 2, while the induced fluid is admitted through a passage 6. The stream collects in a chamber 4 having an outlet 5. In another form, Fig. 2, the induced fluid is admitted through a central passage 6, the inducing-nozzles 2 being arranged tangentially at the top of the diffuser. In the form shown in Fig. 4, the axes of the nozzles 2 meet and lie upon the mean stream surface of the mixed fluids, the diffuser being shaped to correspond with the hyperboloid formed by the revolution of these axes about the central line. Two or more rings of such nozzles may be employed so as to form a multi-stage ejector. In a further modification, the inducing and induced fluids may be admitted through volute passages to concentric annular 'nozzles, as shown in plan in Fig. 8. Or the induced fluid may be admitted through a central passage 6, Fig. 9, so that, where water is induced by steam, a vortex is formed in the passage 6, through which uncondensed steam may escape. A central tube may be fitted in the passage 6 for this purpose. To increase the velocity of the induced fluid where it meets the inducing-nozzles, an artificial vortex may be created in the passage 6 by the employment of a suitable guide 14, Fig. 11; or accelerating-nozzles may be provided.