Paper pulp pressure screen

Abstract

A paper pulp pressure apparatus includes a body casing having a pipe member and a leg member. The leg member extends diagonally from the pipe member. The pipe member includes an input end for receiving unfiltered fluid and an output end for outputting filtered fluid. The leg member includes a basket for receiving the unfiltered fluid from the input end. The basket includes a cavity which receives a rotor. The leg member includes a drain outlet which is in fluid communication with the cavity of the basket so as to receive contaminants from the unfiltered fluid unable to pass through a filtering media included in the basket.

What is claimed is: 
     
         1 . A paper pulp pressure apparatus comprising:
 a body casing having a pipe member and a leg member which extends diagonally from the pipe member at an angle, the pipe member including an input end for receiving unfiltered fluid and an output end for outputting filtered fluid, the leg member including a basket for receiving the unfiltered fluid from the input end, the basket having a cavity therein which receives a rotor and the leg member having a drain outlet attached thereto and in fluid communication with the cavity of the basket so as to receive contaminants from the unfiltered fluid unable to pass through a filtering media included in the basket.   
     
     
         2 . The apparatus of  claim 1 , further comprising a motor and gearbox assembly which turns the rotor received within the basket to keep the basket clear of contaminants and maintain a consistent flow out of filtered fluid. 
     
     
         3 . The apparatus of  claim 1 , wherein the angle of the leg member relative to the pipe member is determined based on desirable basket dimensions, desired flow rate and installation considerations. 
     
     
         4 . The apparatus of  claim 1 , wherein the drain outlet is configured for use with a continuous rejecting screen or with an intermittent rejecting screen. 
     
     
         5 . The apparatus of  claim 4 , wherein the drain outlet is continuously open with the continuous rejecting screen. 
     
     
         6 . The apparatus of  claim 4 , wherein the drain outlet includes one or more valves that may be selectively opened with the intermittent rejecting screen. 
     
     
         7 . The apparatus of  claim 5 , wherein a flow meter is used to maintain an appropriate flow rate of contaminants with the continuous rejecting screen. 
     
     
         8 . The apparatus of  claim 6 , wherein the one or more valves remain closed for a duration to maintain an appropriate flow rate of contaminants with the intermittent rejecting screen. 
     
     
         9 . The apparatus of  claim 1 , wherein the body casing is attached to an inline pipe which receives a flow of unfiltered fluid. 
     
     
         10 . The apparatus of  claim 9 , wherein the input end of the pipe member includes an input flange and the input flange is attached to a corresponding flange of the inline pipe. 
     
     
         11 . The apparatus of  claim 9 , wherein the output end includes an output flange and the output flange is attached to a corresponding flange of the inline pipe. 
     
     
         12 . The apparatus of  claim 9 , wherein the body casing is shaped to direct a flow of the unfiltered fluid directly into, and towards the bottom of, the basket. 
     
     
         13 . The apparatus of  claim 1 , wherein the basket includes a fluid opening into the drain outlet where the drain outlet receives contaminants too large to pass through the filtering media. 
     
     
         14 . The apparatus of  claim 1 , wherein the filtering media is a wire screen. 
     
     
         15 . The apparatus of  claim 1 , wherein the fluid is pulp slurry 
     
     
         16 . A multi-stage paper pulp pressure screen apparatus comprising:
 a first stage paper pulp pressure screen, a second stage paper pulp pressure screen, a third stage paper pulp pressure screen and a fourth stage paper pulp pressure screen, wherein each paper pulp pressure screen includes:
 a body casing having a pipe member and a leg member which extends diagonally from the pipe member at an angle, the pipe member including an input end for receiving unfiltered fluid and an output end for outputting filtered fluid, the leg member including a basket for receiving the unfiltered fluid from the input end, the basket having a cavity therein which receives a rotor and the leg member having a drain outlet attached thereto and in fluid communication with the cavity of the basket so as to receive contaminants from the unfiltered fluid unable to pass through a filtering media included in the basket. 
   
     
     
         17 . The apparatus of  claim 16 , wherein each higher stage paper pulp pressure screen further filters the contaminants received from the drain outlet of a prior lower stage paper pulp pressure screen.