Apparatus for controlling liquid level in a knot drainer

Details Apparatus for controlling liquid level in a knot drainer Apparatus for controlling liquid level in a knot drainer

1995-02-28

1997-03-11

Lamb, Brenda A.

Paper making and fiber liberation

Apparatus

Slurry supply conditioning or condition maintaining

162252, D21H 2300

Patent

active

056097298

ABSTRACT:
A screen aperture blinding prevention and liquid overflow prevention and level control apparatus for a knot drainer senses liquid level within the knot drainer and compares the sensed level to a setpoint level. Differences in the two levels generate control signals of appropriate magnitude and direction, and those control signals are transmitted to a valve whose degree of responsiveness and openness is adjusted to change the outflow rate of accepts liquor from the accepts chamber of the rejects separator. In addition, passive level control is provided in the discharge line for establishing accept flooded screen apertures regardless of variations of inflow and outflow rates during operation while active level control to create accept flow rate greater than, less than, or equal to inlet flow rate is provided by the combination of siphonic loop, barometric leg and control values for accepts outflow and for backwash nozzle flow. Continuous flow of fiber and liquid through separating screen apertures is appropriately supervised by monitoring accepts chamber pressure.

REFERENCES:
patent: 2463526 (1949-03-01), Dickson
patent: 4317731 (1982-03-01), Roberts, Jr. et al.
patent: 4343708 (1982-08-01), Rantanen et al.
patent: 4407718 (1983-10-01), Pollock
patent: 5104553 (1992-04-01), Lorenz et al.
patent: 5143220 (1992-09-01), Young et al.

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