| 摘要 |
<p>977,618. Reflux heads for fractionating columns. SOC. DES VERRERIES INDUSTRIELLES REUNIES DU LOING. May 17, 1961 [Nov. 2, 1960], No. 18032/61. Heading B1B. A reflux head for a fractionating column comprises a pipe 5 for conveying the overhead condensate form a channel 4 to a glass funnel 17 mounted, within the head of the column, to one end of a glass tube 15 which passes through side-tube 10, and a piston and cylinder 25 for making the funnel undergo reciprocating motion between a position P1, where all the condensate is refluxed to the column, and a position P2 where all the condensate is discharged via tube 9 to a receiver, the driving mechanism of the funnel being adjustable to vary the proportion of time of a complete oscillation during which condensate is refluxed to the column. Tube 15 slides on a metal rod 11. The right-hand end of tube 15 is doubledbacked externally on itself forming a flange 18a. Bellows 19, which may be made of polytetrafluoroethylene, are secured, by clamps 20 and 21, to the mouth of tube 10 and to flange 18a respectively ; and a spiral spring 22 is held under compression between the clamps. The piston is actuated in cylinder 25 by impulses of oil fed under pressure from a master cylinder (not shown) ; and this motion is transmitted, via the mechanical mechanism shown, tc the rod 15. Each time the oil pressure in cylinder 25 is released, the spring 22 causes the rod 15 to return to it! initial position. In an alternative embodiment, the movement of tube 15 is controlled pneumatically. Automatior mechanisms may be used tc supply the control means witt impulses in accordance with a predetermined cycle corresponding to the reflux rate required.</p> |
