US3198238A

US3198238A - Sheet metal gas burner construction

Info

Publication number: US3198238A
Application number: US121015A
Authority: US
Inventors: Robert L Hughes
Original assignee: Carrier Corp
Current assignee: Carrier Corp
Priority date: 1961-06-30
Filing date: 1961-06-30
Publication date: 1965-08-03
Anticipated expiration: 1982-08-03

Description

Aug. 3, 1965 R. 1.. HUGHES 3,198,238

SHEET METAL GAS BURNER CONSTRUCTION Filed June 30. 1961 INVENTOR.

ROBERT L. HUGHES BY 2 g ATTORNEY.

United States Patent 3,198,238 SHEET METAL GAS BURNER CONSTRUCTION Robert L. Hughes, West Covina, Caiif assignor to (Zarrier Corporation, Syracuse, N.Y., a corporation of Delaware Filed June 30, 1%1, Ser. No. 121,615 1 Claim. (Cl. 158--1tl4) This invention relates broadly to gas burning equipment. More particularly, this invention pertains to constructions used for the purpose of mixing gaseous fuel and air to form a combustible mixture to be supplied to apparatus such as furnaces designed to heat air for use in residential homes.

Equipment of the kind under consideration is used to blend a mixture of air and a gaseous fuel to present a combustible product for ignition and fiow through a heat exchanger employed in a furnace for heating air. Burners of the kind under consideration utilize a mixing tube arranged in conjunction with a nozzle for supplying the gaseous fuel so that the energy in the gaseous fuel is used to induce a flow of air from the ambient into the tube in proportions designed to provide a mixture of the kind desired.

This invention has, for its chief object, the construction of a gas burner of the kind described wherein the parts constituting the burner are primarily sheet metal stampings that can be formed and assembled with the use of simple machine techniques leading to the production of a relatively inexpensive gas burning unit.

A second object of the invention is the provision of a gas burning unit formed from structural parts which lend themselves to simple machine operations, such as stamping and piercing and which may be made in high production quantity at relatively low cost.

Another object of the invention is the provision of a multi-unit gas burner constructed primarily of sheet metal stampings wherein novel means are included to provide lateral flow of an ignited combustible mixture of the kind required to assure ignition of each of the individual units of the burners under circumstances where a single pilot burner is employed.

A still funther object of the invention is the provision of a novel method of forming a multiple unit gas burner wherein adequate lateral flow of a portion of the output of a single burner is assured to provide ignition to other burners in the unit.

An additional object of the invention is the provision of an improved gas burner of the well known inshot or single port type wherein the combustible gas-air mixture emanates from a single port in the burner.

These and other objects of the invention are attained through the provision of a gas burner unit comprising a first plate member having portions deformed from its plane and a second plate member having a like configuration wherein the members are joined together with the planar portions of each in mutual engagement and the deformed portions confronting one another to provide passageways for the accommodation of air-gas mixtures suitable for combustion.

Other objects and features of the invention will be apparent upon a consideration of the ensuing specification and drawings wherein:

FIGURE 1 is a plan view, partly broken away, of a gas burner unit illustrating the invention;

FIGURE 2 is a fragmentary view in cross-section taken along lines II- II of FIGURE 1;

FIGURE 3 is a fragmentary end view taken along lines III-III on FIGURE 1, illustrating a feature of the invention;

FIGURE 4 is a side view of the unit illustrated in FIGURE 1; and

FIGURE 5 is a fragmentary view of the unit illustrating a step in the fabrication thereof.

Referring more particularly to the drawing wherein a multiple unit gas burner assembly is shown in order to more effectively illustrate certain features of the invention, it is contemplated that a gas burner assembly be formed from a relatively inexpensive material such as a sheet steel by simple stamping and forming operations. In this regard, it is to be noted that a stamping 10 of sheet metal is cut to a form sufficient to provide an assembly of three gas burning units. As pointed out above, the invention may be illustrated as it pertains .to a single gas burner unit. However, certain features of the invention relate to a multiple gas burner unit and it is for this reason that such has been chosen as an embodiment for illustration. The sheet metal material is preferably cold rolled steel and has a thickness of about After the sheet metal plate or stamping 10 has been cut to size, it is subjected to aforming operation with conventional punch and die equipment wherein one half of the gas burner construction is formed.

To this end, conventional punch and die equipment is employed to force material upwardly from the plane of the plate 1% and provide a deformation including spaced sections 11 having a first portion 12 extending inwardly of the edge of the sheet, provided with a constant crosssection of a semi-circular configurationv The portion 12 is referred to as the nozzle accommodating portion and surrounds a nozzle 35 connected to the gaseous fuel supply for the purpose of delivering gas under pressure to the burner.

Further, considering the deformation 11 of the plate in terms of the configuration of the portion thereof extending axially from portion 12, it will be observed that portion 14 resembles one half of a frustum of a cone, note FIGURE 5. The succeeding portion 16 of the formed sheet, forms one half of a venturi-type configuration. Section 18 is integrally connected to section 16, forming a transition from the venturi-shaped section 16 to a section 24) of constant semi-circular cross-section extending .to the edge of the plate. Section 18' extends between adjacent units and connects adjacent sections 18 in the manner shown in FIGURE 1. Section 22 connects adjacent sections 20 and is elevated only slightly above the plane of the plate 10.

Once the deformation described has been accomplished the plate 10 is subjected to a piercing and trimming operation for the purpose of forming openings 24 in sections 14 and removing the portions of section 22 indicated in FIGURE 1. Openings '24 provide passages for the flow, by induction, of primary air to the gas supplied through nozzle 36.

In order to form the assembly illustrated, one of the plates 10, formed, pierced and trimmed in the manner described, is superimposed over a second plate 16, also formed, pierced and trimmed in the manner described with the undersurface of each in contact with the undersurface of the other so that the flat sections adjacent each burner are in contact with one another. The plates 10 are then welded, preferably at the points indicated by reference numeral 28 so as to provide an assembly defining three symmetrical passageway-s it), each similar in shape, for the flow of a gas-air mixture to the edge 30 of the plate where a suitable pilot burner 31 is located. To complete the assembly a flame retainer member 32 having a cylindrical body 32' and integrally formed circumferentially spaced radially extending ribs 34 is inserted in the part of the passageway defined by confronting sections 20. If desired, the outer edges 30 may be rolled in to assist in the retention of member 32 in the assembly. Thus gas-air mixtures flow through the open- Patented Aug. 3, 1965.

ing defined by the inner surface of flame retainer 32 and the openings defined by ribs 34 and the plate members.

In tthe opening 35, defined by the confronting sections 22, there is provided a flat insert 36 arranged, as shown in FIGURE 3, between two ribs 34 to provide two separate lateral paths between retainers 32 assembled in adjacent burners. The sections 22 are deformed as illustrated by dimples 33 to secure the inserts against relative movement in relation to the plates 18 as well as retainer members 32. With the construction described, suitable lateral paths are provided for the purpose of assuring ignition of gas-air mixtures flowing through burners remote from pilot burner 31.

With the construction described there is provided a single port burner assembly having satisfactory primary air supply and lateral paths for flow of gas-air mixtures to meet any carry-over requirement imposed on burner constructions. The flame retainer 32 functions to assure favorable flame propagation by preventing flash-back and preventing flame lift-011, that is the tendency of the portion of the flame emanating from the main burner port to flow radially from the burner, in the manner known to those skilled in the art. The construction illustrated may be employed to provide a single burner (in which case inserts 36 would be unnnecessary) or any number of burners. The burner assembly may be mounted, to project horizontally, into a heat exchanger with conventional fastening means.

Considering the operation of the burner, valve means, not shown, are situated to supply gas under pressu-re from a source such as a municipal gas main to the burner through the nozzle 36. The flow of high velocity gas from the nozzle induces primary air to mix therewith through openings 24. The resulting mixture flows through the passageway 40 and is ignited by the pilot burner in the conventional manner. Secondary air is induced by the flame to blend with the gas-primary air mixture to provide desirable flame characteristics. Ignition of gas-air mixtures in burners remote from the pilot is accomplished by lateral flow of ignited gas-air mixtures from the burner served by the pilot.

While I have described a preferred embodiment of my invention it will be understood the invention is not limited thereto but may be otherwise embodied within the scope of the following claim.

I claim:

A gas burner comprising a first plate member having spaced portions extending across the width thereof and deformed outwardly thereof, said first plate member having an additional portion deformed outwardly thereof, said additional portion communicating with the spaced portions extending across the width thereof, a second plate member deformed in the same manner as the first plate, said plate members being united with the planar areas of each in mutual engagement and the deformed portions confronting one another to form passageways extending the width of the members and connected by a cross passage of a configuration determined by the deformation, flame retention members arranged in said passageways, and an insert positioned in said cross passage, portions of the plates defining the cross passage being depressed into tight intimate engagement with said insert to prevent relative movement between the plate and the insert.

References Cited by the Examiner UNITED STATES PATENTS 1,278,037 9/18 Shanklin 158-106 1,942,397 1/34 Cuyler 158-115 X 2,309,469 1/43 Marcuse 29-428 2,469,499 5/49 Dresen 158-116 X 2,533,143 12/50 Scharbau et al. 158-104 2,537,542 1/51 Norman 158-116 2,782,842 2/57 Halfmann et al 158-116 2,875,820 3/59 Nesbitt 158-115 2,884,998 5/59 Taylor 158-116 2,949,667 8/60 Cameron et al. 29-428 3,002,552 10/61 Griffln 158-116 3,099,312 7/63 Radley et al. 158-106 JAMES W. WESTHAVER, Primary Examiner.

FREDERICK L. MATTESON, 1a., MEYER PERLIN,

Examiners.