| 摘要 |
1,186,450. Liquid-ring vacuum pumps; injectors. SIEMENS A. G. May 12, 1967 [May 12, 1966], No. 22240/ 67. Headings F1C and F1E. A liquid-ring vacuum pump is preceded by an injector energized by a vapour-gas mixture or a parallel arrangement of an injector energized by vapour and an injector energized by gas. In the arrangement shown in Fig. 1, a chamber 18 is evacuated by an ejector 12 backed by a liquidring pump 1. The gas, e.g., vinyl chloride, withdrawn from the chamber 18, together with liquid entrained from the liquid-ring 4, is discharged at 29 to a separator 5. The gas escapes at 26 while the separated liquid is deflected by a baffle 6 and collects at 25, whence it can return via a pipe 34 to the liquid-ring. Some of the liquid passes from the separator 5 to a vessel 7 where it is heated by, e.g., a heating coil 21, the current in the coil being controlled either manually or, preferably, by a regulator 8 in accordance with the liquid-ring temperature sensed by an element 10, or in accordance with the vapour pressure of the liquid-ring. The resultant vapour 24, e.g., water vapour, passes via a pipe 17 and control valve 16 to join gas 32 withdrawn from the gas 26 via a control valve 15, the resultant vapourgas mixture 33 being accelerated in a nozzle 14 to several times the speed of sound to energize the injector 12. More than one injector may be used. In a modification, Fig. 2 (not shown), the vapour and gas are not mixed but are used separately in two separate injectors connected in parallel.
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