US2840151A

US2840151A - Gas burner of multi section port construction

Info

Publication number: US2840151A
Application number: US532537A
Authority: US
Inventors: Francis B Jackson
Original assignee: Combustion Engineering Inc
Current assignee: Combustion Engineering Inc
Priority date: 1955-09-06
Filing date: 1955-09-06
Publication date: 1958-06-24
Anticipated expiration: 1975-06-24

Description

June 1958 F. B. JACKSON 2,840,151,

GAS BURNER OF MULTI SECTION PORT CONSTRUCTION Filed Sept. 6, 1955 INVENTOR FRANCIS B. JACKSON BY 2 ATTORNEY United States atent 2,840,151 GAS BURNER F MULTISECTION PORT CONSTRUCTION 7 Francis B. Jackson, Chattanooga, Tenn., assignor to Combustion Engineering, Inc, New York,'N. Y., a corporation of Delaware Application September 6, 1955,'Serial No. 532,537 3 Claims. (Cl. 158-114) This invention relates to gasburners and has specific reference to such a burner fabricated of individual port sections (preferably formed of pressed aluminized steel) secured together into an integral structure.

This novel burner organization has special application in (but is not restricted to) the gas-fired house heating unit disclosed in U. S. Patent No. 2,700,505 issued January 25, 1955, to A. C. Jackson under the fitleof House Heating Unit and Automatic Control, Therefor. In heating unitsof this type wherein several burners of varying capacities are employed, it is essential, ,in order to meet competition, that the burners be extremely economical to manufacture yet highly efficient and durable in operation. The novel burner herein disclosed meets these requirements with an extremely high degree of satisfaction.

It is the general object of this invention .to provide .a'

gas burner that is very low .in first cost, readily adaptable to manufacturing processes, and yet highly efficient and durable in operation.

A further object is to .provide agas burner fabricated entirely of pressed aluminized sheet steel that has individual port sections which may be built up as desired to obtain a necessary burner capacity. V

Another object-of the inventionis to provide a gas burner that is equipped with corrosion resisting reinforcements at the port areas.

Other and further objects of the invention will become apparent to those skilled'in the art as the description hereof proceeds.

With the aforementioned objects in view, the invention comprises an arrangement, construction and combination of the elements ofthe gas burner in such a manner .as to attain the results desired-as hereafter more'particularly set forth 'in the following detailed description of an illustrative embodiment; said embodiment being shown by the accompanying drawings wherein:

Fig. l is a longitudinal sectional-view of the novel burner organizationdisclosing the interconnection of the individual port sections and the disposition of the helical battle within the port sections.

Fig. 2 is a sectional view taken along 2--2 of Fig. 1.

Fig. 3 is a plan view of a number of the individual port sections of the burner taken generally along line 33 of Fig. l.

Fig. 4 is an enlarged view of the edge portion enclosed within'circular line 4 in Fig. 1.

. Referring to the drawings wherein like reference characters are used throughout to designate like elements the novel burner is made up ,of a plurality of individual port sections rigidly secured together to .form an integral structure. Each of these sections has a generally V-shaped transverse section (Fig. 2) and is made up of two parallel, pressed steel walls 12 having their outer edges bent toward each other to define a chamber intermediate the wall. The lower or side edges 14 of the walls of each section arein overlying relation with one of these edges .crimped over the other in a fluid tight manner as clearly shown inFigs. land 3. The top edges 16 are maintained in spaced relation to define an elongated slot 18 of restricted area relative to that of'the chamber for the passage ofan air-gasmixture from the interior of :the chamber.

In accordance with the invention the top edges 16 are formed by adding excess material 17 which is folded over, as indicated in Fig. 4. Accordingly the upper end parts of the Walls '12 defining the port area 18 include coated portions 9 of the wall 12, rather than the exposed sheared edge as is the case in prior art designs.

To assist in maintaining the proper spacing between folded edges 16 and to give rigidity to the structure these edges are provided with inwardly formed portions 19 that are held together by bending the clip 21 formed on one of the portions over the rim of the other portion.

Each of the walls 12 of each port section is formed with an outwardly projecting circular portion or rim 20 having an opening 22 provided .therein. When the several sections 10 that makeup a complete burner are in assembled relation circular portions 20 of adjacent walls of adjacent sections are in abutting relation and are secured together in a fluid tight manner by crimping the edge forming opening 22 in one wall over the edge forming the opening in the immediate adjacent wall, as clearly shown in Fig. 1.

The opening 22 formed in the endmost Wall of one of the end sections is sealed by sheet. metal member 24, held Within said opening by a force 'fit, while the opening in the endmost wall of the other section is connected to inlet duct 26 in a fluid tight manner; the extremity of the duct being crimped over the edge of the opening for this purpose.

Positioned Within port sections 10 and extending through the openings 22 is a suitable bafile 28, illustratively shown as a helical plate, effective to give an even velocity distribution to each of the portsections of the air-gas mixture entering the assemblage of sections through inlet duct 26.

During operation of this novel burner an air-gas mixture enters the assemblage of port section 10 through inlet duct 26. This mixture receives a swirling motion .by baffle 28 which evenly distributes it to each of the chambers defined by the port sections. The mixture .then passes from each of said chambers through slots 18 at a substantially uniform velocity, immediately thereafter mixes with secondary air, and burns with a short even flame. a

In fabricating the burner it is unnecessary that the numerous joints be Welded since, with the pressures at which these burners operate, an entirely satisfactory seal is obtainable with the crimped type of joint disclosed. It is thus evident that this burner is readily adaptable to relatively inexpensive manufacturing processes and can be produced extremely rapidly at a very low cost.

During the manufacture of this burner, the

port sections

10 and 12 are first stamped from aluminized sheet steel. A preferred material is aluminized steel type 1, special killed and oiled. These

section plates

10 and 12 are joined together centrally at 22 in Fig. 1 and the required number of section assemblages are secured together at 14 and 21, .followingplacement of a distribution baflie 28 in the port assemblage plus attachment of air-gas mixing tube 26 to one end thereof and of end plate 24 to the other assemblage end.

in former designs these burner parts were fabricated of carbon steel and after being assembled were aluminized both inside and out by precleaning and then dipping into a bath of molten aluminum While at a temperature of 1400 F. I

Experience has shown however, that it is very ditficult tomaintain uniformity of temperature of the metal parts while preparing for dipping. This will cause inequality in the aluminum coating. Furthermore it causes difiiculty in maintaining the elongated opening 18 .at a uniform and predetermined width throughout the length thereof. Such facturing.

irregularity of opening is undesirable since it changes the shape and uniformity of the flame. In order to correct these faults in earlier burner designs, that require dipping .in an aluminum bath, additional hand labor must be performed whichadds considerably to the cost of manu- In a burner designed and constructed in accordance .with the present invention the above disadvantages have been entirely eliminated by utilizing aluminized sheet steel and in addition by providing the burner port area with reinforcements 17 which not only add strength to edge ,16, exposed to highest operational temperatures, but which above all provides this uppermost edgeportion a 19 with protection against possible corrosive action by condensation drippage. h V 7 By building the burnerof individual port sections great fiexibility in capacity is provided since the capacity of a with outwardly projecting cylindrical portions 20 the major portion of said adjacent walls 12 are spaced from one another providing a passage through which secondary air is admitted to both sides of elongated slots 18. This allows an eflicient and immediate mixing of the secondary I air with the air-gas mixture, passing through the elongated slots, permitting'faster combustion of the gas and lowering of the over all flame height. Moreover, the new construction shown lowers the temperature of the complete burner by reason of secondary air admission to both; ,4 sides of the burner and by further reason of the reflective qualities of the aluminized surface.

In fabricating, the burner. pressed steel, aluminized, killed and oiled before fabrication of the burner assembly,

is preferably employed because ofits relatively low cost ability of the burner to withstanding the deteriorative effect ,of'hig'h temperatures and to resist corrosion are greatly increased over that of any heretofore known comparable burner.

While a preferred embodiment of the gas burner has been illustrated and described it is to be understood that such is, merely illustrative and not restrictive ,and that variations and, modifications may be made therein without departing from the spirit and scope of the invention.

It is therefore to be understood that the invention is not limited to the precise details set forth but includes'such changes and alterations as fall within the purview thereof.

What is claimed is: 0'

l. A gas burner fabn'cated entirely of sheet steel that is aluminized prior to burner assembly and comprising a unit madeup of a plurality of similar, aligned, juxtaposed, fluidlycenterconnected sections arranged in accordian fashion, an, inlet duct connectedito one of the endmost sections, each of said sections including a pair of generally V-shaped, parallel, aluminized sheet metal walls having their edges bent toward each other thereby forming a chamber with .theedges of said walls forming the top of the:Vbeing spaced to form a slot for the egress of gas and the remaining edges being secured together in a fluid tight manner and the edge of the wall portions forming the slot being raw unprotected steel, said slotforming edges being folded over away from said slot to 4 form a rounded edged rim surrounding said slot, said sections being disposed with their walls parallel to one another with adjacent walls of adjacent sections and the end wall to which the inlet ductis secured having aligned openings, an outwardly raised rim formed about each of said openings, withthe rims formed on adjacent walls of adjacent sections being secured together, and bafile means positioned withinisaid unit and extending through the alignedlop eningsoperable to evenly distribute tocach of the sections the'gas entering the unit through the inlet duct.

2. A gas burner of the type described comprising a plurality of sections disposed in parallel spaced apart planes and having a common transverse axis, each of said sections including a pair of generally triangular-shaped walls of sheetmetal' coated with a protective metal prior to burner fabrication facing one another outwardly dished and secured together along two of the edges of the triangle by crimping the edge of one wall over the edge of the other thereby formingachamber between the walls, the third edge of the triangle being spaced to form an elongated slot of restricted section relative to that of the chamber for the egress of a gaseous fuel from the chamber, said third slot-forming edge being of .raw unprotected'steel and folded over away from said slot more than 90 degrees to form a rounded edged rim defining said slot, each of 'sa'id'walls having an outwardly raised surface located centrally intermediate said two edges and adjacent the apex formed by the juncture of said two edges with this surface ofadjacent sections being in abutting relation thereby spacing the major portion of adjacent walls of adjacent sections from each other providing'a passage for the free flow of air, said abutting surfaces having aligned openings formed therein with the rim of one opening crimped over the rim of the adjacent opening, one of the endmost walls having an inlet opening,

an inlet duct coaxial with said openings and having its downstream end crimped over the rim of the opening in said endmost wall, and baffle means extending through said aligned openings and operative to evenly distribute the fuel to the several sections. v

3. A gas burner comprising in combination a plurality .of sheet metal sections coated with aprotective coating prior to fabrication and disposed in parallel spaced apart planes, each of said sections including a pair of sheet metal plates facing one another and dished .to form a chamber therebetween, these plates being secured together along all but a portion of their perimetrical edgesby crimping the edge of one plate over the edge of the other,

said portions of said edges being spaced to forma slot for the egress of gaseous fuel from the chamber with thc wall portions forming the slots being reversely bent so that they extend away from the extreme edge of the slots and with the edge of these wall portions being raw metal,

an inlet duct connected to one of the endmost plates, adjacent plates of adjacent sections being spaced with the sections being in communication with eachfother through openings in said adjacent plates with the openings being in alignment, an outwardly raised rim formed about at least one of the openings in said adjacent plates with said adjacent plates being secured together by having the rim of one opening crimped over that of the other,

and balfie means extending through said aligned openings and operative .to evenly distribute the fuel to the several sections.

' References Cited in the file of this patent UNITED STATES PATENTS