US 4,522,716 A · Shower pipes for rotary drum filter

Abstract

A shower pipe for a rotary drum filter has a square cross-sectional shape defined by top, bottom and side walls. The sidewalls and a pair of lengthwise-extending continuous diffusion flanges depending from the bottom wall of the pipe stiffen the pipe against sag for placement at a 12 o'clock position spanning the filter drum. The pipe is formed of fiberglass reinforced plastic in two longitudinally-divided hollow sections in a pair of mirror image, trough-like molds. Each section has a pair of interconnection flanges for mating the sections together. The interconnection flanges extend normally to the sidewalls to stiffen the pipe when the bottom wall of the pipe is vertically-oriented for placing the pipe at at 9 o'clock position along one side of the filter drum. Glass rods are secured in the interior corners of the pipe to provide diagonal rigidity, for placing the pipe at, e.g., a 10-11 o'clock position between the top and side of the filter drum. Before assembly of the sections, funnel-shaped discharge holes are formed in two staggered rows in the bottom wall of the lower section. The outer surface of the bottom wall is molded so that the diffusion flanges can be precisely aligned tangentially with the outlet side of the discharge holes.

Claims19

Dependent claims

A shower pipe for a rotary drum filter comprising:

a rigid elongate pipe for spanning the length of a filter drum, said pipe being of rectangular cross section;
means defining a first row of spray holes extending in spaced apart relationship axially along said pipe, the holes extending through an outer wall of the pipe for discharging a first liquid spray line along the length of the pipe when said pipe is filled with a liquid under pressure;
means defining a second row of said spray holes extending in spaced apart relationship parallel to said first row, the second row being in the same quadrant of said pipe as the first row, for discharging a second liquid spray line along the length of the pipe and close to said first line;
and
a pair of diffusion flange means depending from the pipe, one flange means extending lengthwise of the pipe along each row of holes and joining the pipe adjacent to each said row, the pair of flange means being circumferentially closely spaced apart to diffuse said first and second liquid spray lines lengthwise of the pipe into two separate, circumferentially-spaced, but closely positioned, axially-diffused sprays of liquid which extend in the same direction from the pipe;
the spray holes in said second row being axially spaced between the holes of the first row so that the axially diffused sprays of liquid in the first spray line are axially spaced apart from one another but axially overlap the diffused sprays in the second spray line.

3 more elements

Dependencies are inferred from the claim text.

Shower pipes for rotary drum filter

Life of this patent

Shower pipes for rotary drum filter

Life of this patent

Abstract

Claims19