CA1141650A - Blowpipe type of burner - Google Patents
Blowpipe type of burnerInfo
- Publication number
- CA1141650A CA1141650A CA000355902A CA355902A CA1141650A CA 1141650 A CA1141650 A CA 1141650A CA 000355902 A CA000355902 A CA 000355902A CA 355902 A CA355902 A CA 355902A CA 1141650 A CA1141650 A CA 1141650A
- Authority
- CA
- Canada
- Prior art keywords
- tubular member
- combustion
- forward end
- annular chamber
- open
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
- F23D14/52—Nozzles for torches; for blow-pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gas Burners (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A novel burner, e.g. for a gaseous fuel is provided herein. The burner includes a combustion nozzle housing having an axial gaseous fuel inlet and a plurality of radial combustion-supporting gas inlets and an axial nozzle. The burner also includes a novel self-cooling shield having a pair of spaced-apart inner and outer concentric unapertured tubular mem-bers secured to, and projecting from, the forward end of the nozzle housing, providing an axially extending annular chamber therebetween, the annular chamber having an open forward end and communicating with a radially extend-ing closed ended rear annular zone, the outer tubular member being open at its forward end, and closed at its rear end, and the inner tubular member being open at both its forward end and its rear end, the inner tubular member extending axially outwardly beyond the forward end of the outer tubular member, whereby cooling air is drawn in laminar flow into the annular chamber from the open end thereof to the rear annular zone and is expelled along with hot gaseous products of combustion through the inner tubular member. Thus cooling air is drawn in laminar flow into the annular chamber and is expelled along with the hot gaseous products of combustion through the inner tubular member. As well, preheated combustion-supporting gas (e.g. air) is admitted to the air inlets after passing rearwardly with-in the annular chamber. Thus the torch not only is a self-cooling, hand-held, propane torch, but also the combustion is more efficient because of the preheating of the air.
A novel burner, e.g. for a gaseous fuel is provided herein. The burner includes a combustion nozzle housing having an axial gaseous fuel inlet and a plurality of radial combustion-supporting gas inlets and an axial nozzle. The burner also includes a novel self-cooling shield having a pair of spaced-apart inner and outer concentric unapertured tubular mem-bers secured to, and projecting from, the forward end of the nozzle housing, providing an axially extending annular chamber therebetween, the annular chamber having an open forward end and communicating with a radially extend-ing closed ended rear annular zone, the outer tubular member being open at its forward end, and closed at its rear end, and the inner tubular member being open at both its forward end and its rear end, the inner tubular member extending axially outwardly beyond the forward end of the outer tubular member, whereby cooling air is drawn in laminar flow into the annular chamber from the open end thereof to the rear annular zone and is expelled along with hot gaseous products of combustion through the inner tubular member. Thus cooling air is drawn in laminar flow into the annular chamber and is expelled along with the hot gaseous products of combustion through the inner tubular member. As well, preheated combustion-supporting gas (e.g. air) is admitted to the air inlets after passing rearwardly with-in the annular chamber. Thus the torch not only is a self-cooling, hand-held, propane torch, but also the combustion is more efficient because of the preheating of the air.
Description
~1~165~
- This invention relates to hand-held welding torches.
More particularly, it relates to a hand-held, self-cooling, gas welding torch using, e.g. propane gas.
It is well known that hand-held torches which produce a flame for welding or other purposes become hot. It was prop-osed in the past to overcome this problem by providing a water-cooled sh-ield around~he flame. For example, in the burner taught by Canadian Patent No. 466,261 issued July 4, 195~ to J.M. Crowe, ` a water jacket extended throught the length of the burner body.
10 Also, Canadian Patent No. 876,526 issued July 27, 1971 to K.
Kunioka et al provided a multi-outlet oxygen-fuel blowing lance in which the oxygen blowing pipe was enveloped along its length by cooling water flowing in a cooling m~antle.
The provision of air chambers around the burner nozzle has also been suggested~ For èxample, Canadian Patent No. 954,787 issued September 17, 1974 to W.E. Troyer disclosed a welding gun nozzle in which a fume-extracting chamber was formed concentric with a conventional nozzle. Such chamber had its orifice so designed as to draw in fumes from a region laterally outward from the nozzle. The patented welding gun provided included a nozzle for usè in operations where smoke or fumes are created. The noz-zle had a first member having an end which may be placed in the region where smoke or fumes are created. The 2i~st member in-cluded a first passageway therethrough. A second member was pro-vided which was coaxial with and surrounded the first member and was spaced radially therefrom along an axis to define a chamber therebetween into which smoke or fumes may be drawn. The second member had an end spaced from the end of the first member along the axis. Means were positioned between the end of the first , ~
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- This invention relates to hand-held welding torches.
More particularly, it relates to a hand-held, self-cooling, gas welding torch using, e.g. propane gas.
It is well known that hand-held torches which produce a flame for welding or other purposes become hot. It was prop-osed in the past to overcome this problem by providing a water-cooled sh-ield around~he flame. For example, in the burner taught by Canadian Patent No. 466,261 issued July 4, 195~ to J.M. Crowe, ` a water jacket extended throught the length of the burner body.
10 Also, Canadian Patent No. 876,526 issued July 27, 1971 to K.
Kunioka et al provided a multi-outlet oxygen-fuel blowing lance in which the oxygen blowing pipe was enveloped along its length by cooling water flowing in a cooling m~antle.
The provision of air chambers around the burner nozzle has also been suggested~ For èxample, Canadian Patent No. 954,787 issued September 17, 1974 to W.E. Troyer disclosed a welding gun nozzle in which a fume-extracting chamber was formed concentric with a conventional nozzle. Such chamber had its orifice so designed as to draw in fumes from a region laterally outward from the nozzle. The patented welding gun provided included a nozzle for usè in operations where smoke or fumes are created. The noz-zle had a first member having an end which may be placed in the region where smoke or fumes are created. The 2i~st member in-cluded a first passageway therethrough. A second member was pro-vided which was coaxial with and surrounded the first member and was spaced radially therefrom along an axis to define a chamber therebetween into which smoke or fumes may be drawn. The second member had an end spaced from the end of the first member along the axis. Means were positioned between the end of the first , ~
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member and which extended outwardly from the first member a distance substantially equal to the distance o~ radial spacing of the second member. That means provided a substantially continuous opening forming the sole interconnection from external of the nozzle to the chamber. Means were also provided for con-necting the chamber to a source of negative pressure whereby air flow into the opening~would remove smoke or fumes from a region laterally outwardly of such opening.
While the patentee did teach that his welding gun also includes means for cooling a welding gun employing the fume-ex-tracting nozzle which allows a welding gun and those hoses used to be made of smaller and lighter material and yet have the long life, such means were not self-operating. The means did require a source of vacuum. ~hile it was stated that, along with the fumes, the nozzle also drew in ambient air in large quantities, and as a result, the nozzle was sald actually to operate at cooler temperatures than conventional nozzles, the burning characteristics were not improved.
An object therefore, of one aspect of this invention is to provide a new improved gas hand torch which is self-cooling without the addition of external sources of cooling fluid.
An object of another aspect of this invention is to provide such a torch in which the cooling air is also used as ~` the combustion supporting gas.
By one broad aspect of this invention, a gas fuel burner is provided including a combustion nozzle housing having an axial gaseous fuel inlet and a plurali~y of radial combustion-supporting gas inlets and an axial nozzle, the burner including a self-cooling shield comprising: a pair of spaced-apart inner and outer concentric unapertured tubular members secured to, and projecting from, the forward end of the nozzle housing, providing an axially extending annular chamber there-between, said annular chamber having an open forward end and communicating with a radially extending closed ended rear annular zone, the outer tubular member being open at its forward end, and closed at its rear end, and the inner tubular member being open at both its forward end and its rear end, the inner tubular member extending axially outwardly beyond the forward end of the outer tubular member, whereby cooling air is drawn in laminar flow into the annular chamber from the open end thereof to the rear annular zone and is expelled along with hot gaseous products of combustion through the inner tubular memoer.
By one variant thereof, the burner includes means for admitting preheated combustion-supporting gas to the combustion-supporting-gas inlets after passing rearwardly via the axial annular chamber to the rear annular 7one . .
By a variation thereof, the burner includes a disc-like baffle se-cured to the housing an aligned at the rear end of the inner tubular member;
whereby to provide an annu]ar entry to the inner tubular member from the cylindrical chamber.
In the accompanying drawings.
Figure 1 is a central longitudinal section through one embodiment of the torch of this invention; and Figure 2 is a section through the line II-II of Figure 1.
As seen in the drawings, the conventional hand-held torch 10 in-cludes a cylindrical housing 11 provided with a disc-like front baffle 12 having a central aperture 13 therein. Within the housing ll!is a nozzle body 14 having an axial gas inlet port 15 leading through an axial inlet aperture 16 to the mixing ~i :, .
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chamber 17. The gas, e.g., butane, is mixed with air entering through a plurality of radial air inlet ports 19 in the housing 11 connecting with a plurality of radial inlet ports 20 in the nozzle body.
Secured to the nozzle housing 11 is an outer cylin-drical tubular member or shield 21 having an open forward end 22 closed off by a reak end wall 23 which is secured to the nozzle housing 11 at a central aperture 24 by suitable means, e.g., welding. An inner cylindrical concentric tubular member or shield 25 having an open forward end 26 and an annular open rear end 27 spaced from the disc-like baffle 12 is secured to the outer shield 21 by means of a plurality of longitudinally extending braces 28, and to the disc-like baffle 12 by a plur-ality of bracing connections 29. An annular chamber 30 is thus provided between the outer tubular shield 21 and the inner tub-ular shiëld 25. In addition, a rear cylindrical chamber 31 is . provided leading from the annular chamber 30 to the radial air inlet ports 19 and to the annular open rear end 27.
In operation, the air for combustion and for cooling 20 is drawn in via the annular chamber 30. The air thus simultan- -eously provides a cooler outer wall of the -outer tubular shield ' 21 and becomes heated to augment the combustion of the propane gas. A portion of the drawn-in air is also expelled through ~"
annular end 27 as an annular gaseous shield 32 between the outer wall of the inner tubular shield 25 and the central flame 33. In this way, a self-cooling hand-held propane torch is provided in which the combustion is more efficient because of the preheating of the combustion-supporting air.
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member and which extended outwardly from the first member a distance substantially equal to the distance o~ radial spacing of the second member. That means provided a substantially continuous opening forming the sole interconnection from external of the nozzle to the chamber. Means were also provided for con-necting the chamber to a source of negative pressure whereby air flow into the opening~would remove smoke or fumes from a region laterally outwardly of such opening.
While the patentee did teach that his welding gun also includes means for cooling a welding gun employing the fume-ex-tracting nozzle which allows a welding gun and those hoses used to be made of smaller and lighter material and yet have the long life, such means were not self-operating. The means did require a source of vacuum. ~hile it was stated that, along with the fumes, the nozzle also drew in ambient air in large quantities, and as a result, the nozzle was sald actually to operate at cooler temperatures than conventional nozzles, the burning characteristics were not improved.
An object therefore, of one aspect of this invention is to provide a new improved gas hand torch which is self-cooling without the addition of external sources of cooling fluid.
An object of another aspect of this invention is to provide such a torch in which the cooling air is also used as ~` the combustion supporting gas.
By one broad aspect of this invention, a gas fuel burner is provided including a combustion nozzle housing having an axial gaseous fuel inlet and a plurali~y of radial combustion-supporting gas inlets and an axial nozzle, the burner including a self-cooling shield comprising: a pair of spaced-apart inner and outer concentric unapertured tubular members secured to, and projecting from, the forward end of the nozzle housing, providing an axially extending annular chamber there-between, said annular chamber having an open forward end and communicating with a radially extending closed ended rear annular zone, the outer tubular member being open at its forward end, and closed at its rear end, and the inner tubular member being open at both its forward end and its rear end, the inner tubular member extending axially outwardly beyond the forward end of the outer tubular member, whereby cooling air is drawn in laminar flow into the annular chamber from the open end thereof to the rear annular zone and is expelled along with hot gaseous products of combustion through the inner tubular memoer.
By one variant thereof, the burner includes means for admitting preheated combustion-supporting gas to the combustion-supporting-gas inlets after passing rearwardly via the axial annular chamber to the rear annular 7one . .
By a variation thereof, the burner includes a disc-like baffle se-cured to the housing an aligned at the rear end of the inner tubular member;
whereby to provide an annu]ar entry to the inner tubular member from the cylindrical chamber.
In the accompanying drawings.
Figure 1 is a central longitudinal section through one embodiment of the torch of this invention; and Figure 2 is a section through the line II-II of Figure 1.
As seen in the drawings, the conventional hand-held torch 10 in-cludes a cylindrical housing 11 provided with a disc-like front baffle 12 having a central aperture 13 therein. Within the housing ll!is a nozzle body 14 having an axial gas inlet port 15 leading through an axial inlet aperture 16 to the mixing ~i :, .
' ' ` ~ ' , 6~
chamber 17. The gas, e.g., butane, is mixed with air entering through a plurality of radial air inlet ports 19 in the housing 11 connecting with a plurality of radial inlet ports 20 in the nozzle body.
Secured to the nozzle housing 11 is an outer cylin-drical tubular member or shield 21 having an open forward end 22 closed off by a reak end wall 23 which is secured to the nozzle housing 11 at a central aperture 24 by suitable means, e.g., welding. An inner cylindrical concentric tubular member or shield 25 having an open forward end 26 and an annular open rear end 27 spaced from the disc-like baffle 12 is secured to the outer shield 21 by means of a plurality of longitudinally extending braces 28, and to the disc-like baffle 12 by a plur-ality of bracing connections 29. An annular chamber 30 is thus provided between the outer tubular shield 21 and the inner tub-ular shiëld 25. In addition, a rear cylindrical chamber 31 is . provided leading from the annular chamber 30 to the radial air inlet ports 19 and to the annular open rear end 27.
In operation, the air for combustion and for cooling 20 is drawn in via the annular chamber 30. The air thus simultan- -eously provides a cooler outer wall of the -outer tubular shield ' 21 and becomes heated to augment the combustion of the propane gas. A portion of the drawn-in air is also expelled through ~"
annular end 27 as an annular gaseous shield 32 between the outer wall of the inner tubular shield 25 and the central flame 33. In this way, a self-cooling hand-held propane torch is provided in which the combustion is more efficient because of the preheating of the combustion-supporting air.
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Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A burner including a combustion nozzle housing having an axial gaseous fuel inlet and a plurality of radial combustion-supporting-gas inlets and an axial nozzle, the burner including a self-cooling shield comprising: a pair of spaced-apart inner and outer concentric unapertured tubular members secured to, and projecting from, the forward end of said nozzle housing, providing an axially extending annular chamber there-between, said annular chamber having an open forward end and communicating with a radially extending closed ended rear annular zone, the outer said tubular member being open at its forward end, and closed at its rear end, and the inner said tubular member being open at both its forward end and its rear end, the inner said tubular member extending axially outwardly beyond the forward end of said outer tubular member, whereby cooling air is drawn in laminar flow into said annular chamber from the open end thereof to said rear annular zone and is expelled along with hot gaseous products of com-bustion through said inner tubular member.
2. The burner of claim 1 including means for admitting preheated combustion-supporting gas to said combustion-supporting-gas inlets after passing rearwardly via said axial annular chamber to said rear annular zone.
3. The burner of claim 2 including a disc-like baffle secured to said housing and aligned at the rear end of said inner tubular member;
whereby to provide an annular entry to from said rear annular zone to said inner tubular member.
whereby to provide an annular entry to from said rear annular zone to said inner tubular member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000355902A CA1141650A (en) | 1980-07-10 | 1980-07-10 | Blowpipe type of burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000355902A CA1141650A (en) | 1980-07-10 | 1980-07-10 | Blowpipe type of burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1141650A true CA1141650A (en) | 1983-02-22 |
Family
ID=4117391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000355902A Expired CA1141650A (en) | 1980-07-10 | 1980-07-10 | Blowpipe type of burner |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1141650A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492384A1 (en) * | 1990-12-22 | 1992-07-01 | OSU-MASCHINENBAU GmbH | Nozzle for device and method for high-speed flame spraying |
-
1980
- 1980-07-10 CA CA000355902A patent/CA1141650A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492384A1 (en) * | 1990-12-22 | 1992-07-01 | OSU-MASCHINENBAU GmbH | Nozzle for device and method for high-speed flame spraying |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |