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    • 1. 发明申请
    • FILTERING METHOD AND APPARATUS
    • 过滤方法和装置
    • WO1992008599A2
    • 1992-05-29
    • PCT/GB1991002028
    • 1991-11-18
    • PROCESS DEVELOPMENTS LTD.
    • PROCESS DEVELOPMENTS LTD.KALMAN, Peter, Gabor
    • B29C47/68
    • B29C47/681B01D29/09B01D29/52B01D29/606B01D29/608B01D29/668B01D29/846B01D35/12B29C47/0019B29C47/92B29C2947/926B29C2947/92961Y10T137/0391Y10T137/0402Y10T137/1797Y10T137/4643
    • Filtering apparatus includes two or more passages (2) acting in parallel, each having an extended filter (12) which passes through inlet and outlet ports (48, 49), preferably sealed by solidified plugs of the flowable substance such as a polymer being filtered. The flow of such substance to one passage can be terminated so as to permit filter advance under conditions of zero pressure drop, whilst flow through the other passage continues. Filter advance can be assisted by extrusion of a sealing plug in the outlet port under the pressure of such substance from the other passage which is still filtering. In an additional or alternative mode, flow into a passage is terminated and a secondary outlet (20, 21) in that passage is opened. This creates a counterflow under the pressure of substance from the other passage, which cleans the filter. The secondary outlet can be sealed by a plug which is extruded during counterflow. An alternative valve for the secondary outlet, which can also be used in a diverter valve for controlling the input of substance to the two passages, has a side passage (26) in which is formed a plug of solidified substance, and means (27) for pushing the plug into the flow substance.
    • 过滤装置包括两个或更多个平行作用的通道(2),每个通道(2)具有延伸的过滤器(12),该过滤器通过入口和出口(48,49),优选地通过可流动物质的固化塞(例如被过滤的聚合物)密封 。 这种物质流向一个通道可以被终止,以便允许过滤器在零压降的条件下前进,同时流过另一通道。 过滤器的前进可以通过在这种物质的压力下将密封塞挤压在出口端口,从另一个仍然过滤的通道来进行。 在附加或替代模式中,流入通道的流动终止,并且该通道中的二级出口(20,21)打开。 这在另一个通道的物质压力下产生逆流,从而清洁过滤器。 次级出口可以通过在逆流期间挤出的塞子来密封。 用于二次出口的替代阀,其也可用于控制物质输入到两个通道的分流阀,具有侧通道(26),其中形成有凝固物质的塞子,以及装置(27), 用于将塞子推入流动物质中。