Liquid purification or separation – Flow – fluid pressure or material level – responsive – Diverse sensing means
Patent
1989-02-21
1990-07-31
Jones, W. Gary
Liquid purification or separation
Flow, fluid pressure or material level, responsive
Diverse sensing means
210134, 210137, 210138, 210143, 210145, 210147, 210387, 210400, B01D 33044, B01D 3382, B01D 3370
Patent
active
049448706
ABSTRACT:
An automatic filtration dewatering system includes a cover to which a filtration raw liquid supply pipe and a pressure air supply pipe are connected. A plate having a filter medium support and a filtrate exhaust pipe is selectively closed by a cover with a pneumatic cylinder vertically moving said cover. Filter medium moving rollers are provided on both sides of the cover and plate, and a sheet-like long filter medium is stretched over said rollers for movement a predetermined distance per one step of filtration. The improvement in the system comprises a control device functioning to: (1) operate the pneumatic cylinder just after receiving a starting signal to close the cover and said plate, (2) supply raw liquid after the closed condition is detected and a predetermined closed time elapses to start filtration, (3) stopping supply of raw liquid at the earlier time either when pressure of said raw liquid in said cover has reached a predetermined value or a predetermined filtration time has elapsed, (4) supplying pressurized air into the cover, (5) stopping supply of pressurized air when air pressure in said cover is lower than a predetermined value after a predetermined filtrate discharging time has elapsed, (6) operating the pneumatic cylinder to separate the cover from the plate, and (7) detecting a separate position of the cover by means of a limit switch to generate a signal for starting movement of the filter medium.
REFERENCES:
patent: 2867326 (1959-01-01), Hirs
patent: 3731808 (1973-05-01), Rickert
patent: 4233157 (1980-11-01), Miller
patent: 4477350 (1984-10-01), Brandt et al.
Iriyama Yasunori
Osuga Jouichiro
Yagishita Aisaburo
Jones W. Gary
Kabushiki Kaisha Yagishita
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