Patent Publication Number: US-3874841-A

Title: Gas burner

Description:
United States Patent Ferlin Apr. 1, 1975 GAS BURNER 3.806.306 4/1974 Duperow et a]. 431/193 a Inventor: wimam J Ferlin. Detroit Mich. 3.8-2.982 7/1974 Duperow 431/193 [73] Assignce: Lincoln Brass Works, Inc., Detroit, Primary Examiner-Edward G. Favors Mich. Attorney. Agent, or Firm-Barnes, Kisselle, Raisch &amp; 1221 Filed: Apr. 19. 1974 Chme [2i] Appl. No.: 462,374 [57] ABSTRACT A conical inverted funnel shaped baffle positioned [52] U5. CI. 431/193, 126/39 E above h central inlet f a g s burner (l) fle ts in- 151] 1111. C1. F24: 3/10 Coming fuel 8 toward flash-ubwharge-and ignition 158 Field of Search 431/191. 192. 193. 194; P g in a side wall of the burner and (2) e y fuel 12 /39 E gas en route to the main burner ports by throttling a central portion of the gas flow and diverting periph- [56] References Cig d eral portions of the gas flow around the lower edge UNITED STATES PATENTS of 2.562.505 1/1951 Mucllcr 431/191 x 11 Claims, 3 Drawing Figures (ms BURNER This imention relates generally to gas burners of the t pe used in domestic gas ranges and more particularly to gas burners of the type wherein the burner body comprises a base with a cup inverted over it. An end of the cup defines the top of the burner body and the side wall of the cup is apertured to form a ring of burner ports adjacent the burner top.  
  The side wall of the burner body is also provided with porting through which gas issues into a flash tube which conducts the gas to a pilot flame at which ignition oc curs. lgnition flashes back to this porting and is carried up to the burner ports by one or more carry-up ports in the side wall above the flash-tubc-ehargc-and ignition porting.  
  it is conventional in this type burner to provide a gas inlet opening at a central location in the burner base to facilitate uniform distribution of the incoming gas to the burner ports. When the burner is turned on, the gas issuing from the inlet quickly reaches the burner ports and considerable of the gas issues through the burner ports before it is ignited. When the gas does ignite, a flame momentarily is formed which extends an unusual distance outwardly and upwardly from the burner.  
 Thereafter the flame quickly shrinks to its normal size. This initial outward puff of the flame upon ignition is referred to in the art as roll out&#34;.  
  In the conventional burner of the type under consideration. this roll out is regarded as excessive and dangerous in that it is capable of igniting such human appurtenances as negligees. sleeves, hair of a child. or the like.  
  The object of the present ivention is to provide a relatively simple, inexpensive burner structure of the type discussed which is improved to reduce the extent of &#34;roll out&#34; to safe proportions. One form of the invention is shown in the accompanying drawings.  
  FIG. 1 is a fragmentary view partly in elevation and partly in section illustrating a gas range equipped with a burner according to the present invention.  
  FIG. 2 is an enlarged scale sectional view on line 22 of FIG. 1.  
  FIG. 3 is a fragmentary elevational view in the direction of arrows 3-3 of FIG. 2.  
  Shown in the drawings is a gas range having a top l2 with an opening 14. A drip pan or aeration pain 16 is supported within opening 14 by means of a flange [8 on the pan engaged with range top 12. A grate 20 is supported on flange l8 and centered within pan [6 by lugs 22. The range has a pilot burner 24 disposed within a shield 26. A pilot flame 27 burns in the pilot burner.  
  A flash tube 28 extends between pilot burner 24 and each of a number of gas burners as is conventional. Only one gas burner 30 is illustrated and this burner embodies the present invention. Flash tube 28 has an end 32 adjacent burner 30 and an end 34 adjacent pilot flame 27. Burner 30 and flash tube 28 are supported by a bracket 38 with the burner disposed within a central aeration opening 40 in pan l6.  
  Burner 30 has a body 42 defined in part by a bottom or base plate 44 and in part by an inverted closed center cup 46 which delines a top 48 and a side wall 50. Base 44 has a gas inlet opening 52 and in the structure illustrated the downstream end portion 54 of a mixing tube 56 is secured within opening 52 by suitable means such as crimping. or a fused metal connection.  
 fill  
  Side wall 50 is apertured to provide a ring of burner ports 60 just below top 48, one or more flash-tubecharge-and ignition ports 62 in a lower portion of the burner body and one or more carry-up ports 64 be tween porting 62 and burner ports 60. Side wall 50 is formed with a shoulder 66 below burner ports 60 to protect flames F from drafts of air flowing upwardly around the burner.  
  lnlet 52 is substantially centered in bottom 44 and with respect to top 48 of the burner body. In accordance with the invention a baffle 68 is provided within the chamber 70 defined by bottom plate 44 and cup 46. Baffle 68 has generally the form of an inverted funnel with a lower edge 72. and upward opening 74 and a sloped intermediate wall 76. In the illustrated form of the invention wall 76 is generally conical and upward opening 74 is defined by a substantially cylindrical tubular portion 78 which adjoins wall 76.  
  Baffle 68 is supported by legs 80 which adjoin wall 76 and extend downwardly along the slant height of the cone defined by wall 76. The lower ends of the legs adjoin a common ring 82 which is clamped against bot tom plate 44 by a shoulder 84 in side wall 50 of cup 46. Below shoulder 84 side wall 50 continues in a depending skirt 86 which is lanced and deformed inwardly under plate 44 at a plurality of circumferentially distributed locations to secure cup 46. ring 82 and base plate 44 in assembled relation. The illustrated form of the invention has three legs 80 uniformly distributed around the center of baffle 68.  
  Baffle 68 is substantially centered with respect to inlet 52 and burner top 48. Lower edge 72 of the baffle is positioned above flash-tube-charge-and ignition porting 62. Lower edge 72 has a diameter which is greater than that of the actual inlet; namely, downstream end 54 of mixing tube 56. Upward opening 74 in the baffle has a diameter which is smaller than that of fuel gas inlet 54. The upper end of tubular portion 78 of the baffle is spaced below burner top 48.  
  In use it will be assumed initially that burner 30 is turned off. When suitable valving (not shown) is actuated. fuel gas flows through mixing tube 56 and through downstream end 54 thereof into chamber 70. The gas flows upwardly and impinges upon baffle 68. A central portion of the gas flow passes through the relatively small diameter upward opening 74 which serves as a throttle to delay the flow of gas en route to burner ports 6&#34;. When the gas issues from opening 74 it impinges on burner top 48 and is spread out to flow uniformly toward ports 60. Peripheral portions of the gas flow impinging on baffle 68 are deflected around lower edge 72 which delays this flow of gas en route to ports 60. Lower edge 72 also serves to distribute this flow substantially uniformly to ports 60.  
  The gas flow impeding and deflecting effect of the baffle promotes relatively quick issuance of gas through flash-tube-charge-and ignition ports 62 and into flash tube 28 through opening 32. The gas flows through flash tube 28 and opening 34 therein to pilot flame 27 where it is ignited. Ignition flashes back through tube 28 to porting 62 and then upwardly via carry-up ports 64 to main burner ports 60. The fuel gas by that time issuing through ports 60 is ignited.  
  Baffle 68 thus delays issuance of gas through ports 60 and hastens issuance of gas through porting 62. This results in a decrease in the amount of gas issuing from ports 60 prior to ignition so that when ignition does occur the initial puff or roll out of tlame from the burner is reduced to safe proportions. As in conventional burners, after the initial roll out the flames quickly shrink to normal size as represented at F.  
  Baffle 68 including outlet tube 78. legs 80 and ring 82. advantageously comprises a single stamping of metal such as aluminum. The structure is very inexpensive. The metal of which it is made can be very thin since wall 76 and legs 80 extend along the slant height of a cone and legs 80 adjoin common ring 82 providing the structure with inherent rigidity. This structural strength facilitates handling without damage prior to and during assembly as well as durability in use.  
  While in the illustrated form of the invention baffle 68 is supported by legs in turn supported by bottom plate 44. other means could be employed for positioning and supporting the baffle without departing from the present invention. Similarly, different numbers of supporting legs 80 could be utilized and they could be differently positioned.  
  The width dimension of legs 80 measured in a direction peripheral of edge 72 is preferably kept small to minimize obstruction of the gas flow from inlet 54 to burner ports 60 other than by baffle 68. In a typical burner 30 edge 72 has a circumference of slightly over three inches while the combined widths of legs 80 is about (L75 inch.  
  In some burners it may not be necessary to utilize outlet tube 78. ln such a burner. upward opening 74 would be provided simply at the upper terminus of sloped wall 76. With this construction the entire baffle may be moved upward upwardly to a certain extent and wall 76 might be extended along its slant height to obtain proper positioning of its lower edge 72.  
 I claim;  
  l. in a gas burner having a chamber defined by a bottom having a fuel gas inlet. a top and a side wall apertured to provide burner ports and llash-tube-charge and ignition porting, improved structure which comprises.  
 said inlet having a location which is substantially centered with respect to said bottom and top.  
 means providing a baffle in said chamber between and substantially centered with respect to said bottom and top.  
 said baffle having generally the shape of an inverted funnel with a lower edge. an upward opening and a wall therebetween. said lower edge having a diameter greater than that of said inlet and being located above said flash tubechargeand ignition porting.  
 said upward opening having a diameter smaller than that of said inlet and being spaced below said chamber top.  
 said funnel wall being contoured to effect deflection of fuel gas entering said chamber toward said flash tube-charge-and ignition porting.  
  2. The structure defined in claim 1 wherein said funnel wall is substantially conical.  
  3. The structure defined in claim 2 wherein said baffle has a generally cylindrical tubular portion adjoining said funnel wall which defines said upward opening.  
  4. The structure defined in claim 1 wherein said baffle is supported within said chamber by leg means connected with said funnel wall and extending downwardly from said lower edge into supported relation with said chamber bottom.  
  5. The structure defined in claim 4 wherein said leg means comprises a plurality of legs substantially uniformly distributed with respect to the center of said baffle.  
  6. The structure defined in claim 5 wherein there are three of said legs.  
 7. The structure defined in claim 6 wherein said legs have lower end portions which are connected with acommon ring engaged against said chamber bottom.  
  8. The structure defined in claim 7 wherein said baffle. legs and ring are formed integrally of a single piece of metal.  
  9. The structure defined in claim 4 wherein said funnel wall is substantially conical and said leg means extend substantially along the slant height of the cone.  
  10. The structure defined in claim 9 wherrein said leg means comprises three legs disposed substantially uniformly around the center of said cone.  
 said legs having lower end portions which adjoin a common ring engaged against said chamber bottom,  
 said baffle having a generally cylindrical tubular portion adjoining and extending upwardly from said funnel wall which defines said upward opening. said tubular portion. funnel wall. legs and ring being formed integrally of a single piece of metal.  
  I 1. The structure defined in claim 6 wherein said legs have a combined extent measured peripherally of said lower edge which is no greater than one-fourth of the peripheral dimension of said lower edge.