| 摘要 |
1,109,609. Centrifugal separators. ALFALAVAL AKTIEBOLAG. 26 Oct., 1966 [26 Oct., 1965], No. 48066/66. Heading B2P. In a sludge centrifuge having a primary inlet pipe 10 for liquid to be centrifuged and a clear liquid outlet in the form of a paring disc 11, means to indicate the sludge level in the separating space 13 of the centrifuge rotor 1 comprise a conduit 22 connecting the space 13 via channels 21, 24 to a paring chamber 23 in which a liquid level closer to the axis of rotation of the centrifuge than the outer edge of the paring disc 11 is sensed by means of a pressure or flow sensing means (not shown) inserted in an outlet duct 26 of a paring disc 25. Liquid is supplied through a secondary inlet pipe 18 via channels 19, 21 and the conduit 22 into the separating space 13 where it mixes with the liquid to be separated. A 'controllable throttling valve (not shown) is inserted in the outlet channel 17 of the paring disc 11 or in a duct connected thereto. Sludge outlets 4 in the centrifuge rotor are normally closed by means of a slide valve 5 urged upwardly by liquid which flows from the channel 21 into a space 6 below the valve 5 and which is acted upon by centrifugal force during rotation of the rotor. The rotor bottom has holes which are kept closed by pads 8 acted upon by a spring-pressed ring valve 9. At the start of an operation, the liquid level is at the same radial distance from the rotor axis in the chambers 13, 16 and 23. Before a significant amount of sludge has been separated, the outlet of the paring disc 11 is throttled in such a way that the liquid level in the chamber 23 moves inwardly and lies just outside the inlet opening of the paring disc 25. As soon as the separated sludge reaches a level corresponding to the opening of the conduit 22 in the space 13, this opening is throttled and liquid from the pipe 18 causes the liquid level in the chamber 23 to move inwardly and to discharge through the paring disc 25 and its associated duct 26. The sensing means inserted in the duct produces an impulse which indicates that the sludge collected ought to be discharged. This can be done manually or automatically by actuation of the ring valve 9 and hence of the piston valve 5. |
