公开(公告)号：US3831755A

公开(公告)日：1974-08-27

申请号：US15740671

申请日：1971-06-28

Applicant: ECODYNE CORP

Inventor： GOODMAN B ,  WEIS F ,  MIKKELSON K

IPC: B01D24/46 ,  B01D24/48 ,  B01D35/12 ,  B01D23/24

CPC classification number: B01D35/12 ,  B01D24/12 ,  B01D24/4631 ,  B01D24/4869

Abstract: An improved apparatus for the cleaning of filter beds of a filtration apparatus which comprises a plurality of filter units, each of the units having an upper influent zone, a filter bed, and a lower filtrate zone, and including means for pumping liquid from all of the filtrate zones at a given pumping rate. In accordance with the invention, during the service cycle, liquid is pumped by the pump means from the filtrate zones to service, so that it passes through the filter bed in a downflow direction. When one of the filter units requires backwashing, the pump means is employed to pump liquid simultaneously from the filtrate zones of a majority of the filter units, so that the backwash rate is greater than the normal downflow rate through the filter unit. As an alternative to backwashing a minority of the filter unit with liquid from the majority of the units, or in addition thereto, the increased backwashing rate can be provided by increasing the pumping rate beyond the given rate during the backwashing by using booster pump means.

Abstract translation: 一种用于清洁过滤装置的过滤床的改进装置，其包括多个过滤器单元，每个单元具有上流体区，过滤床和下滤液区，并且包括用于从全部 滤液区域以给定的泵送速率。 根据本发明，在使用周期期间，液体被泵送装置从滤液区域泵送到服务中，使得其沿下流方向通过过滤床。 当其中一个过滤单元需要反冲洗时，泵装置同时从大部分过滤器单元的滤液区泵送液体，使得反冲洗流量大于通过过滤器单元的正常下降流速。 作为将来自大多数单元或另外的液体的少量过滤单元反冲洗的替代方案，可以通过使用增压泵装置在反冲洗期间通过增加超过给定速率的泵送速率来提供增加的反洗速率。