GB191407769A - Improvements in or relating to Rotary Pumps, chiefly for use as Air or Gas Pumps. - Google Patents

Abstract

7769. Siemens Bros. Dynamo Works, [Siemens-Schuckertwerke]. March 27. [Addition to 28,906/12.] Centrifugal. ejector pumps.- Relates to a modification of the pump described in the parent Specification, and consists in replacing the individual non-return outlet valves by a liquidseal device having a similar action. The vanewheel b draws in air &c. through a port c and discharges it, after it has been compressed by the eccentric liquid annulus c, through the outlet ports d, which communicate with an outlet chamber m, Fig. 3, separated by a partition o from an inlet chamber k communicating with the port c. The chamber m is filled with liquid either through leakage from the sealing- annulus e or from a separate supply. According to the pressure-difference set up, the air &c. flows through more or less of the ports d, which are sealed by the liquid in the chamber m. With a considerable pressure-difference, the air &c. flows only through the upper ports d communicating with pockets of the vane-wheel containing air &c. compressed to the same degree as that prevailing in the outlet chamber m. The ports d may be formed as radial slots, Fig. 4. In order to retard the backward flow of the sealing-liquid from the chamber m to the pump, the ports d may be extended to form ducts or tubes r, Fig. 5, or passages in the pump wall. These tubes may terminate at different levels, or ribs may be interposed between the ports d on the outlet side. The outlet ends of the tubes r may be bent upwards. The ports d may taper as shown in Fig. 9, being narrower on the side of the chamber m.