Welding fume extractor

Patent metadata

Field	Value
Publication number	US-9821351-B2
Application number	US-201213610490-A
Country	US
Kind code	B2
Filing date	Sep 11, 2012
Priority date	Nov 11, 2011
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A fume extraction hood is designed to be positioned above a welding, cutting, or other metal-working location and to remove hot gases, smoke and fumes produced during these processes. The hood forms a box-like structure with an extractor rail structure disposed in an internal volume of the hood. The extractor rail structure comprises panels that force sharp turns in the gases, causing particulate matter to drop out of the gases both outside and inside the extractor rail. A primary path for gases accelerates and re-directs the gases entering into the extractor rail, and within the rail. The rail may form a dropout tray that can be removed for cleanout of collected particulate. The side and end rails of the hood may create a secondary path for gas not directly intaken into the extractor rail. This secondary path is re-directed towards the extractor rail, where gas is collected and particulate is forced to drop out as it joins the primary path.

First claim

The invention claimed is:

1. A fume extractor hood comprising:
a box-like structure having end rails, side rails and a cover, the box-like structure configured to at least partially enclose a volume over a process that generates fumes and particulate matter during operation; and
an extractor rail structure disposed in the volume and configured to draw fumes and particulate towards an inner space from which the fumes are conveyed to exhaust ductwork, the extractor rail structure comprising a side wall forcing a first turn of more than 90 degrees in all fumes drawn into the extractor rail structure to force dropout of at least some of the particulate matter, first and second lateral extensions extending outwardly from first and second sides of the side wall, forcing the fumes around the first and second lateral extensions into an inner passageway between the side wall and a deflector that accelerates the fumes entering the extractor rail structure, a base plate coupled to the deflector that in operation forces dropout of at least some of the particulate matter, a dropout tray below the base plate that in operation collects dropped out particulate matter, and gas entries forcing a second turn of more than 90 degrees in all fumes drawn into the extractor rail structure to force dropout of particulate matter entrained with the fumes into the inner passageway, wherein the fumes are forced to enter the extractor rail structure only through a passageway wherein the dropout tray is disposed below the inner passageway, beneath the base plate, for collecting particulate matter dropping out of the fumes due to the second turn, wherein the side wall comprises part of the dropout tray, and between the deflector and the base plate, and therefrom directly into the exhaust ductwork.

2. The hood of claim 1 , wherein the first and second lateral extensions extend horizontally.

3. The hood of claim 1 , wherein the dropout tray is removable for cleaning.

4. The hood of claim 1 , wherein the gas entries comprise apertures in fluid communication with the inner passageway.

5. The hood of claim 4 , wherein the apertures comprise slots formed in a lower portion of the side wall.

6. The hood of claim 1 , wherein the extractor rail structure is bilaterally symmetrical, comprising symmetric inner passageways, side walls, deflectors, and gas entries.

7. The hood of claim 1 , wherein the extractor rail structure is disposed at an approximate centerline of the box-like structure.

8. The hood of claim 1 , wherein at least one of the side and end rails comprises a re-directing shape that re-directs fumes not directly entering the extractor rail structure downwardly and back towards the extractor rail structure.

9. A fume extractor hood comprising:
a box-like structure having end rails, side rails and a cover, the box-like structure configured to at least partially enclose a volume over a process that generates fumes and particulate matter during operation; and
an extractor rail structure disposed in the volume and configured to draw fumes and particulate towards an inner space from which the fumes are conveyed to exhaust ductwork, the extractor rail structure comprising parallel first and second panels that force at least one first turn of more than 90 degrees in all fumes drawn into the extractor rail structure to force dropout of at least some of the particulate matter outside the extractor rail structure, a first lateral extension extending outwardly from the first panel, forcing the fumes around the first lateral extension, a base plate coupled to a deflector that in operation forces dropout of at least some of the particulate matter, a dropout tray below the base plate that in operation collects dropped out particulate matter, and at least one gas entry that forces at least one second turn of more than 90 degrees in all fumes drawn into the extractor rail structure to force dropout of particulate matter entrained with the fumes to a collection location within the extractor rail structure, wherein the dropout tray is disposed at the collection location, and beneath the base plate, collecting particulate matter dropping out of the fumes due to the second turn, wherein a side wall that contributes to the first and second turns comprises part of the dropout tray, and wherein the fumes are forced to enter the extractor rail structure only through a passageway between the deflector and the base plate, and therefrom directly into the exhaust ductwork.

10. The hood of claim 9 , wherein the dropout tray is removable for cleaning.

11. The hood of claim 9 , wherein the at least one gas entry comprises apertures in fluid communication with an inner passageway between the first and second turns.

12. The hood of claim 11 , wherein the apertures comprise slots formed in a lower portion of a side wall.

13. A fume extractor hood comprising:
a box-like structure having end rails, side rails and a cover, the box-like structure configured to at least partially enclose a volume over a process that generates fumes and particulate matter during operation; and
an extractor rail structure disposed in the volume and configured to draw fumes and particulate towards an inner space from which the fumes are conveyed to exhaust ductwork;
wherein the extractor rail structure comprises first and second side walls defining a primary fume path, the side walls being configured and disposed to force a plurality of turns of more than 90 degrees in all fumes drawn into the extractor rail structure to force dropout of at least some of the particulate matter outside and inside the extractor rail structure, first and second lateral extensions extending outwardly from first and second side walls, forcing the fumes around the first and second lateral extensions, a base plate coupled to one of the side walls that in operation forces dropout and of at least some of the particulate matter, and a dropout tray below the base plate that in operation collects dropped out particulate matter, wherein the dropout tray is disposed at a collection location, disposed beneath the base plate, collecting particulate matter dropping out of the fumes inside the extractor rail structure, wherein a side wall that contributes to the turns comprises part of the dropout tray, and wherein the fumes are forced to enter the extractor rail structure only through a passageway between one of the side walls and the base plate, and therefrom directly into the exhaust ductwork; and
wherein at least one of the side and end rails comprises a re-directing shape that re-directs fumes in a secondary fume path for fumes not directly entering the extractor rail structure downwardly and back towards the extractor rail structure.

Assignees

• Hammers Brian J
• Illinois Tool Works

Inventors

• Hammers Brian J

Classifications

• B07B7/086

  generated by the winding course of the gas stream · CPC title

• B08B15/02 Primary

  using chambers or hoods covering the area {(B08B15/002 takes precedence)} · CPC title