US3016950A

US3016950A - Gas burners

Info

Publication number: US3016950A
Application number: US698282A
Authority: US
Inventors: Herbert G Smith
Original assignee: American Air Filter Co Inc
Current assignee: American Air Filter Co Inc
Priority date: 1957-11-22
Filing date: 1957-11-22
Publication date: 1962-01-16
Anticipated expiration: 1979-01-16

Description

Jan. 16, 1962 H. G. SMITH GAS BURNERS Filed Nov. 22. 195'? FIG] FIG.5

INVENTOR HERBERT G. SMITH FIG.6

ATTORNEX United Estates. Patent i) 3,016,950 GAS BURNERS Herbert G. Smith, Moline, Ili., assignor to American Air Filter Company, Inc., Louisville, Ky., a corporation of Delaware Filed Nov. 22, 1957, Ser. No. 698,282 7 Claims. (or. 158-116) This invention relates to gas burners and more particularly to gas burners of the type wherein one or more inserts are positioned in an elongated slot of a burner housing to break up the slot into a plurality of gas ports or outlets.

One object of the present invention is the provision of a gas burner insert which is of relatively simple construction and inexpensive to manufacture.

Another object is to provide an insert which insures uniformly spaced gas outlets for promoting uniform combustion.

A further object is the provision of an insert which resists clogging and is easy to clean.

A still further object is to provide an insert which may be used singly in a relatively narrow burner slot and is suited for use in multiples in wider slots.

The individual insert of my invention may be briefly described as comprising two members: a ladder-like grid, and a separator adapted to be enclosed within the grid when the grid is folded along its longitudinal center line. The folded grid and separator cooperate with the contacting inner faces of the burner slot to provide a plurality of uniform passageways through which the gas passes upwardly from the burner plenum to the combustion zone at the outlet of the passageways.

The invention is illustrated in the accompanying drawing wherein: I 7

FIGURE 1 is a partly broken side elevational view of a burner housing with an insert mounted in the elongated outlet slot of the housing;

FIGURE 2 is a broken perspective view illustrating the ladder-like grid in plane form;

FIGURE 3 is a broken perspective view of the insert formed by folding the grid over the separator;

FIGURE 4 is a Vertical sectional view of the upper portion of a burner adapted to accommodate a single insert, this view being taken along the line 4-4 of FIGURE 1;

FIGURE 5 is a vertical sectional view corresponding to one taken along the lines 5-5 of FIGURE 4;

FIGURE 6 is a fragmentary top view of a burner housing adapted to accommodate two inserts and an intervening separator; and,

FIGURE 7 is a vertical sectional view taken along the line 7--7 of FIGURE 6.

Referring to the drawing, a plenum generally designated 1 and connected to receive a combustible mixture of gas is defined by a front and

rear wall

2 and 3 respectively, a bottom wall 4 provided with a gas inlet, and end walls 5 and 6. The burner housing may be of any conventional construction such as separate members joined together or may be cast as a sin le unit.

Each insert is made from a folded ladder-like grid 3 (shown in plane form in FIGURE 2) and a separator 9 adapted to be enclosed within the folded grid. The grid 8 is an elongate, generally rectangular sheet of heat and corrosion resistant material such as stainless steel and is stamped or otherwise worked to form a series of transversely extending rungs 10 terminating at each end in a pair of longitudinally extending rails 11. Each of the four corners of the grid is provided with a notch 12 which serves to properly position the insert when mounted in the burner slot.

The separator 9 is a fiat member of substantially the 'ice same length as the grid 8 and a width somewhat less than half the length of the rungs when the grid is in plane form. Thus, when the grid is folded, the end portions of the individual slots or cutouts bounded by the rungs and rails will lie in a plane below the lower edge of the separator enclosed within the folded grid. It may be noted from the drawing that the longitudinal edges of the separator 9 are slightly rounded, this being desirable mainly along the upper edge to insure that the rounded edge may be seated firmly against the rounded inner surface of the rung bight.

The grid 8 is folded along its longitudinal center line to form an inverted, somewhat rakelil-:e member with each rung 1! assuming a U-shaped contour. The separator 9 is disposed within the folded grid so that the separator upper edge seats firmly against the biglit of the rungs, this resulting in the separator lower edge extending along a line spaced somewhat above the juncture of the rungs and rails. The folded grid and separator may be secured together by spot welding through opposing portions of a single rung and the intermediate separator, or the grid may be folded to the extent that the separator is frictionally held within the rungs.

The structure of the insert as described results in the separator and rungs cooperating to define the three sides of each of a plurality of vertically extending passageways i3 obtained when the insert is positioned in the burner slot. The space between the lower longitudinal edge of the separator and the upper longitudinal edges of the rails serves as an inlet for gas to how from the plenum i to these passageways. As will be apparent, the number of passageways provided by each insert is double the number of cutouts or openings provided in the grid 8 in its plane form.

Referring now to FIGURES 4 and 5, the upper portion of the

side walls

2 and 3 of the burner housing define the I opposing faces of the elongated slot which receives the insert. As shown, the slot defining portion of the walls are relatively thicker so that the slot width corresponds with the thickness of the insert while obtaining a plenum width which is greater than the slot width. The inner faces of the thickened wall portions contact the outer faces of the rungs when the insert is mounted in the slot and thereby serve as the fourth side of eachof the vertical passageways 13 through which gas flows upwardly to the point of combustion from the burner plenum. It will be apparent that gas flowing into the passageways from the plenum 1 flows thereinto from both between and outside the rails 11.

The inserts are supported in the slot by seating the horizontal edge of each notch 12 and the end portion of separator lower edge on the horizontal edge of an upwardly open cut-out portion provided centrally in each of the end walls 5 and 6. The depth of the end wall notches is such that when the insert is mounted in the housing, the bight portion of the rungs projects above the upper edges of the

walls

2 and 3. The insert is secured in position by inverted L-shaped members 14 which are fastened to the end walls by means of a screw 15 or the like, the members 14 extending upwardly along the outer surface of the end walls, and then inwardly over the top of the insert for a short distance. The portion of member 14 which overlies the end of the inserts is raised to accommodate the upwardly projecting bight portion of the insert end. The members 14 serve also to prevent the escape of any gas through the cut-outs in the end walls.

The insert of my invention lends itself readily to being used in multiples in relatively wide burner slots. In this connection, FIGURES 6 and 7 illustrate two inserts arranged within a single slot and separated by an intermediate separator 9. The separator positioned between the inserts in such an arrangement is dimensionally the same as the separators which are within the folded grid. This results in a uniformity of transverse spacing between the vertical passageways 13. This arrangement also permits replacement of a single insert or separator if required for any reason.

Having described my invention, I claim:

1. A gas burner insert comprising: a ladder-shaped grid of uniform thickness throughout and including longitudinally-spaced rungs and longitudinally-extending opposite side rails, folded along its longitudinal center line to form said rungs thereof into U-shaped contours, said opposite side rails of said grid extending along the lower end of said rungs to define, between adjacent rungs on each side, the lower end of a series of vertically disposed passageways; and, a single separator member disposed within said folded grid with the lower edge of said separator member being spaced above the lower end of said vertically disposed passageways to define therebetween an inlet for the flow of gas into each of said passageways.

2. The insert of claim 1 wherein said separator memher is frictionally secured within said folded grid.

3. The insert of claim 1 wherein said separator memher is a substantially flat strip having its upper edge contacting the bight portions of said rungs.

4. A gas burner assembly comprising: a burner housing having an elongated slot in which a plurality of gas burner inserts are received in side-by-side relationship; said plurality of gas burner inserts being as specified in claim 1; and, an additional single separator member disposed between each set of adjacent inserts, said additional separator having its lower edge spaced above the lower end of said vertically extending passageways of said inserts.

5. In a gas burner assembly, the combination, comprising: a gas burner insert comprising a ladder-shaped grid of uniform thickness throughout and including a series oflongitudinally-spaced rungs and longitudinallyextending opposite side rails, folded along its longitudinal center line to form an integral element having said series of rungs bent into U-shaped contour and said side rails disposed along the bottom ends of said rungs to define the lower end of a series of vertically disposed gas passageways, and a single separator member within said folded grid with the lower edge of said separator member spaced above the lower end of said vertically disposed gas passageways and a burner housing including a pair of longitudinal walls having opposed inner faces defining an elongated slot receiving said gas burner insert, said opposed inner faces having a vertical dimension substantially equal to the vertical dimension of said separator member whereby gas may flow into said vertically disposed gas passageways from between and outside the side rails.

6. The gas burner assembly of claim 5 wherein: said burner housing includes end walls having centrally dis posed rectangular openings receiving the ends of said insert, the vertical dimension of said openings being sub stantially equal to the vertical dimension of said separator member; and said folded grid includes notches in the lower corner of both ends thereof, said notches extending upwardly to the lower edge of said separator member.

7. The gas burner assembly of claim 6 including: a plurality of said gas burner inserts mounted in side-byside spaced relationship; and, an additional single separater member disposed between each set of adjacent inserts.

References Cited in the file of this patent UNITED STATES PATENTS 2,252,305 Puschner et al. Aug. 12, 1941 2,428,274 Flynn et al. Sept. 30, 1947 2,470,880 Zimbelman et al. May 24, 1949 2,588,895 Tavcner Mar. 11, 1952 2,855,032 Hahn Oct. 7, 1958 FOREIGN PATENTS 565,470 Germany Dec. 1, 1932