公开(公告)号：US4632684A

公开(公告)日：1986-12-30

申请号：US636210

申请日：1984-07-31

申请人： Kamran Karbassiyoon ,  Philip E. Foster ,  Francis I. Akers ,  Daniel G. Fletcher

发明人： Kamran Karbassiyoon ,  Philip E. Foster ,  Francis I. Akers ,  Daniel G. Fletcher

IPC分类号： C03B37/018 ,  C03B37/012 ,  C03B37/07

CPC分类号： C03B37/01869

摘要： An arrangement for collapsing tubular formations into optical preforms includes a control arrangement which controls the pressure build-up at the downstream end of the tubular formation during all of but the last one of the collapsing increments to control the flow of a gaseous medium through the interior of the tubular formation from an upstream end to and beyond the downstream end of the tubular formation. The magnitude of the back-up pressure is controlled by a set point controller in dependence on the actual value of the back-up pressure, the set point controller being operative for counteracting any deviation from the desired pressure. The set point controller controls the flow-through cross-section of a control valve that admits a pressurized inert gas to a region situated downstream of the downstream end of the tubular formation and also downstream of the point at which the pressure build-up is being measured.

摘要翻译： 用于将管状结构塌缩成光学预成型件的布置包括控制装置，其控制在所有但最后一个塌缩增量期间的管状地层的下游端处的压力积聚，以控制气态介质通过内部的流动 从管状结构的上游端到下游端的管状结构。 备用压力的大小根据设定点控制器根据备用压力的实际值来控制，设定点控制器用于抵消与期望压力的任何偏差。 设定点控制器控制控制阀的流通截面，该控制阀将加压的惰性气体接纳到位于管状地层下游端下游的区域，并且还压力增加点的下游 测量。