Impact reducer for drainage stacks

Patent metadata

Field	Value
Publication number	US-11021858-B2
Application number	US-201916386408-A
Country	US
Kind code	B2
Filing date	Apr 17, 2019
Priority date	Apr 17, 2019
Publication date	Jun 1, 2021
Grant date	Jun 1, 2021

Abstract

An impact reducer for drainage stacks includes a first pipe section with a first internal passage having at least five alternating bends along its longitudinal axis, a bypass vent in a second pipe section having a second internal passage parallel to the longitudinal axis and a clean out plug in a third pipe section having a third internal passage at a radial angle with the longitudinal axis. First and second end fittings are located on the impact reducer for connecting the device to a drainage pipe. The impact reducer adjusts the turbulent flow of water falling in the drainage stack, converting the turbulent flow to laminar flow before the lower bend fitting of the drainage stack, which protects the lower bend fitting from impact shock.

First claim

The invention claimed is:

1. An impact reducer for drainage stacks, comprising:
a longitudinal axis, a first end and a second end;
a first internal passage parallel to the longitudinal axis, the first internal passage having at least five alternating bends extending between the first end and the second end;
a second internal passage parallel to the longitudinal axis, wherein a first opening to the second internal passage is connected to the first internal passage at the first end and a second opening to the second internal passage is connected to the first internal passage at the second end, the second internal passage configured to form a bypass vent which transfers air from the second end of the first internal passage to the first end of the first internal passage;
a third internal passage connected to the first internal passage at a radial angle with the longitudinal axis;
an outer housing forming an interior cavity which includes the first, second and third internal passages, wherein a clean out plug connected to the third internal passage extends through the outer housing;
a threaded cover removably connected to the clean out plug;
noise absorbing insulation which fills the cavity between the outer housing and the internal passages;
a first end fitting located at the first end; and
a second end fitting located at the second end.

2. The impact reducer for drainage stacks of claim 1 , wherein each bend represents a change of at least 90 degrees with respect to the longitudinal axis of the first internal passage.

3. The impact reducer for drainage stacks of claim 1 , wherein the impact reducer is installed within a drainage stack before a curve at the bottom of the drainage stack.

4. The impact reducer of claim 1 , wherein the clean out plug has male threads and the threaded cover has female threads.

5. The impact reducer of claim 1 , wherein the first end fitting and the second end fitting are slip end fittings.

6. The impact reducer of claim 1 , wherein:
the first internal passage has a diameter, d,
the second internal passage has a diameter equal to about 0.43d;
the first opening between the first internal passage and the second internal passage is about 65d; and
the second opening between the first internal passage and the second internal passage is about 0.85d.

7. The impact reducer for drainage stacks of claim 6 , wherein the at least five alternating bends include a first bend, a second bend, a third bend, a fourth bend and a fifth bend;
the first bend located between the first end fitting and the second bend, wherein the first bend represents a change of 135 degrees with respect to the longitudinal axis of the first internal passage and extends in a first direction;
the second bend located between the first bend and the third bend, wherein the second bend represents a change of 90 degrees with respect to the longitudinal axis of the first internal passage and extends in a second direction opposite the first direction;
the third bend located between the second bend and the fourth bend, wherein the third bend represents a change of 90 degrees with respect to the longitudinal axis of the first internal passage and extends in the first direction;
the fourth bend located between the third bend and the fifth bend, wherein the fourth bend represents a change of 90 degrees with respect to the longitudinal axis of the first internal passage and extends in the second direction; and
the fifth bend located between the fourth bend and the second end fitting, wherein the fifth bend represents a change of 135 degrees with respect to the longitudinal axis of the first internal passage and extends in the direction of the longitudinal axis.

8. The impact reducer of claim 7 , wherein:
the first internal passage has a diameter, d, and
the distance between the second bend and the fourth bend is about 2.6d.

9. The impact reducer of claim 7 , wherein a distance between the first and second bend, the second and third bend, the third and fourth bend and the fourth and fifth bend is two to four times an inner diameter of the first internal passage.

10. The impact reducer of claim 7 , wherein:
the second internal passage extends above the first opening; and
the second internal passage extends at an angle towards the second opening, wherein the angle is in the range of 20 degrees.

11. The impact reducer of claim 7 , wherein the clean out plug is located between second bend and the third bend.

12. The impact reducer of claim 7 , wherein the clean out plug is located between third bend and the fourth bend.

13. A method for reducing the impact of turbulent, falling water upon a bend fitting at a downstream end of a drainage stack, comprising:
installing an impact reducer on the drainage stack above the bend fitting, the impact reducer having an outer housing forming an interior cavity having a first end and a second end, the interior cavity including:
a first internal passage having at least five alternating bends extending between the first end and the second end, wherein the at least five alternating bends include a first bend, a second bend, a third bend, a fourth bend and a fifth bend,
a second internal passage parallel to the first internal passage, wherein a first opening to the second internal passage is connected to the first internal passage at the first end and a second opening to the second internal passage is connected to the first internal passage at the second end, wherein the second internal passage is configured to form a bypass vent which transfers air from the second end of the first internal passage to the first end of the first internal passage,
a third internal passage connected to the first internal passage at a radial angle to the first internal passage, the third internal passage extending through the outer housing and configured to form a clean out plug on the outer housing, and
noise reducing insulation filling the cavity between the outer housing and the internal passages;
wherein passing the turbulent, falling water through the impact reducer reduces momentum and kinetic energy of the falling water, converting the turbulent flow of the water to a laminar flow, and forcing-air in the impact reducer into the bypass vent.

14. A method of manufacturing an impact reducer, comprising:
machining two halves of a split metal block to form a mold of the impact reducer, the mold including:
a housing having a cavity including first, second and third internal passages;
the first internal passage having at least five alternating bends along a longitudinal axis of each metal block, wherein the at least five alternating bends include a first bend, a second bend, a third bend, a fourth bend and a fifth bend;
the first bend located between a first end of the housing and the second bend, wherein the first bend represents a change of 135 degrees with respect to the longitudinal axis of the first internal passage and extends in a first direction;
the second bend located between the first bend and the third bend, wherein the second bend represents a change of 90 degrees with respect to the longitudinal axis of the first internal passage and extends in a second direction opposite the first direction;
the third bend located between the second bend and the fourth bend, wherein the third bend represents a change of 90 degrees with respect to the longitudinal axis of the first internal passage and extends in the first direction;
the fourth bend located between the third bend and the fifth bend, wherein the fourth bend represents a change of 90 degrees with respect to the longitudinal axis of the first internal pass

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Jamil Rehan

Classifications

• F16L55/07

  Arrangement or mounting of devices, e.g. valves, for venting or aerating or draining (apparatus for draining F16T) · CPC title

• E03C1/122 Primary

  Pipe-line systems for waste water in building (pipe-line systems in general F17D) · CPC title

• F16L43/00

  Bends; Siphons (with cleaning apertures F16L45/00) · CPC title

• F16L55/02736 Primary

  using transversal baffles defining a tortuous path · CPC title

• F16L45/00

  Pipe units with cleaning aperture and closure therefor · CPC title