公开(公告)号：US3357566A

公开(公告)日：1967-12-12

申请号：US37699164

申请日：1964-06-22

Applicant: ZURN IND INC

Inventor： SCHMID JOHN H ,  ZENTIS RAMON J

IPC: B01D29/00 ,  B01D29/11 ,  B01D35/02

CPC classification number: B01D29/118 ,  B01D29/54 ,  B01D29/682 ,  B01D35/02 ,  B01D2201/082 ,  B01D2201/287

公开(公告)号：US3574509A

公开(公告)日：1971-04-13

申请号：US3574509D

申请日：1969-02-14

Applicant: ZURN IND INC

Inventor： ZENTIS RAMON J ,  GOODE JOHN R ,  DURSO DONALD F ,  SCHMID JOHN H

IPC: B01D29/23 ,  B01D29/38

CPC classification number: B01D29/23 ,  B01D29/60 ,  B01D29/606 ,  B01D29/682 ,  B01D2201/0407 ,  B01D2201/287

Abstract: A filter for liquid and a control. The filter element is made up of two concentric perforated cylinders which restrain a very fine wire mesh between them, this assembly being supported in a hollow body. Liquid is fed into the inside of the filter element and flows to an outlet, by way of the perforations, through the mesh. The perforations form cavities which serve as reservoirs on the inside of the mesh. A backwash arm is rotated about an axis at the center of the filter element. The backwash arm has a slot defined by shaped members which sealingly sweep over the inner periphery of the filter element. Thus, debris which accumulates in the perforations is washed back through the slot in the arm and to a waste system by the impetus of the pressure on the downstream side of the filter element. The control is made to actuate the backwash arm at a rate of speed such that it will make a sweep around the inner periphery of the filter element only as required to clean the mesh and maintain flow. This is accomplished by a circuit that senses the fluid pressure drop across the filter. The motor which drives the backwash arm can be driven continuously or intermittently in response to this pressure drop to keep the cavities from filling with debris beyond a predetermined amount. A positive displacement device is connected to the outlet of the backwash arm, to meter the amount of backwash fluid. An interrupter is provided to stop this backwash device as the arm passes over unperforated spots in the filter element.

公开(公告)号：US3256995A

公开(公告)日：1966-06-21

申请号：US29289663

申请日：1963-07-05

Applicant: ZURN IND INC

Inventor： SCHMID JOHN H ,  ZENTIS RAMON J

IPC: B01D29/07

CPC classification number: B01D29/071 ,  B01D29/232 ,  B01D29/682 ,  B01D29/688 ,  B01D2201/287