Elbow connection for pneumatic conveying system

• US 4,995,645 A
• Filed: 02/20/1990
• Issued: 02/26/1991
• Est. Priority Date: 02/20/1990
• Status: Expired due to Fees

• Current Assignee: General Resource Corporation
• Original Assignee: General Resource Corporation
• Inventors: Pausch, Josef
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US07/481,596
• Time in Patent Office: 371 Days
• Field of Search: 285/179, 285/127, 285/176, 406/193, 406/195
• US Class Current: 285/179.1
• CPC Class Codes: B65G 53/523 Wear protection
• CPC Class Codes: F16L 43/00 Bends; Siphons with cleaning apertures F16L45/00
• CPC Class Codes: F16L 45/00 Pipe units with cleaning aperture and closure therefor

Abstract

An elbow connection for pneumatic conveying systems is provided. The elbow has an inlet opening, an outlet opening and a curved area of short radius extending therebetween. The section of the elbow between the inlet and outlet openings has a cross-sectional area that is substantially greater, at least 1.5:1, than the cross-sectional area of the inlet and outlet openings to reduce the wear of the elbow wall caused by the material conveyed therein.

Claims

1. An elbow for changing the direction of flow of material conveyed in conduits in a fluidic or pneumatic material handling conveyor, said elbow comprising:

(a) cylindrical inlet and outlet pipes each having a first end for connection to a conveyor conduit and a second interior end, and each having a continuous cylindrical wall defining an inlet opening in said inlet pipe and an outlet opening in said outlet pipe, said openings having a specific cross-section area;

(b) a generally frusto-conical inlet section and outlet section, each having a narrow end and a wider end, and a continuous frusto-conical wall therebetween, wherein said wall diverges to a region of maximum expansion at said wider end, the small end being continuous with said second interior end of the inlet and outlet pipes; and

(c) a chamber formed at the intersection of the respective wider ends of said frusto-conical inlet section and outlet section, said chamber having a cylindrical extension open to and in communication with said openings and axially aligned with said inlet opening and having an end wall projecting beyond the wider end of said outlet section, the cross-sectional area of said cylindrical extension being between 1.5 and 10 times the cross-sectional area of said inlet opening.

2. An elbow for changing the direction of flow of material conveyed in conduits in a fluidic or pneumatic handling conveyor, said elbow comprising:

(a) an inlet having a cylindrical inlet opening connected to a first expanded section away from said inlet opening, aligned along a first axis;

(b) an outlet having a cylindrical outlet opening connected to a second expanded section away from said outlet opening, aligned along a second axis which intersects said first axis;

(c) a cylindrical chamber section open to and in communication with said openings and aligned along said first axis and having cylindrical walls joining said first expanded section and said second expanded section, said cylindrical chamber having an end wall normal to said first axis and spaced away from said second expanded section;

said end wall having an access opening therethrough;

the cross-sectional area of said cylindrical chamber section being at least 1.5 to 10 times the cross-sectional area of said inlet opening and said outlet opening;

whereby the material conveyed in the conveyor undergoes a substantial reduction in velocity in said cylindrical chamber and undergoes a generally equal substantial increase in velocity on leaving said outlet opening.