US2933133A

US2933133A - Double hypodermic needle type pilot burner

Info

Publication number: US2933133A
Application number: US543101A
Authority: US
Inventors: Leslie F Vixler
Original assignee: Patrol Valve Co
Current assignee: Patrol Valve Co
Priority date: 1955-10-27
Filing date: 1955-10-27
Publication date: 1960-04-19
Anticipated expiration: 1977-04-19

Description

April 19, 1960 L. F. VIXLER DOUBLE HYPODERMIC NEEDLE TYPE PILOT BURNER Filed 001,. 27, 1955 [NV EN TOR. 5.52 /5 1'? Wu 6/? BY 4mm 6 TI'ORNEY DOUBLE HYPODERMIC NEEDLE TYPE PILOT BURNER Leslie F. Vixler, Rocky River, Ohio, assignor to The Patrol Valve Company, Cleveland, Ohio Application October 27, 1955, Serial No. 543,101 '5 Claims. (Cl. 158-115) This invention relates to lighters for .gas burners, such as are used on gas cooking ranges or other gaseous fuel appliances, more specifically it relates to automatic lighters, employing a low-input constantly-burning pilot burner adapted to be used independently of, or in conjunction with a flash tube construction, for causing the ignition of a fuel burner, in a well known manner.

This invention relates to a low-input pilot burner employing an hypodermic needle of the general type of pilot burner disclosed in my co-pending application, Serial No. 524,966, filed July 28, 1955.

The problem in providing low-input pilot burners operating-on a B.t.u. input rating within the range of 50 to 100 B.t.u. per hour, or less, is to provide a stable pilot burner, either when disposed adjacent range burners for direct burner ignition, or when disposed at a distance from range burners and connected therewith by flash mechanisms which produce concussion waves in the flash tubes having a tendency to pull out or extinguish the pilot flame.

I have discovered that by using two hypodermicneedle type pilot burners, disposed as disclosed herein,

providing impinging flames, used independently of orin conjunction with a flame stabilizing wire, an exceptionally :stable pilot flame is produced, which is stable and sub- Estantiall-y unafifected by the concussion waves .and drafts :inherent in flash tube mechanism operating from a central pilot burner.

Therefore, an object of this invention is to provide 'Gther objects'of the invention are to provide a low input pilot burner, adapted to be manufactured at a relatively low cost, which m be used with various types "of ga'sesand'burners, and which may be readily installed and removed, and which is simple and reliable in oper- These and other "objects will be apparent during the course of the following specification.

"In the drawings forming a part of this specification:

Fig. l is atop view of a gas cooking range with ',parts broken away,illustrating a centrally disposed pilot burner;

Fig. 2 is a side view of a range burner and my pilot burner disposed in close proximity to the range burner for direct burner ignition;

Fig. '3 'is an enlarged broken sectional view of the pilot burner shown in Fig. 2, drawn to a larger scale; Fig. 4 illustrates a range burner, a modified form of 'pilotburn'e'r' disposed at ,sonie'distance from the range burner, and associated flash tube mechanism;

Fig. 5 *is'an enlarged broken sectional view of the -pilot burner shown Fig. 4, while atent 3.11%

'23 with the tapered surfaces other.

Fig. 5a illustrates a central header used with the form "of invention illustrated in Fig. 2.

In the drawings the numeral 10 refers to the top plate of a gaseous fuel cooking range, showing a centrally disposed pilot burner and having suitable apertures for accommodating a plurality of range burners 11, supplied with fuel from a supply pipe or manifold 12 through Bunsen tubes 1d, the flow of gas from the manifold 12 being controlled by individual valves 14, in a well known manner. A pilot burner may be disposed in close proximity to each range burner for direct ignition action, as illustrated in Fig. 2, or it may be centrally disposed between the range burners and operatively connected to the individual range burners by flash mechanism as illustrated in Fig. 4. I

The pilot burner 15 illustrated in Figs. 2 and 3 comprises two parallel thin elongated pilot burner tubes 16 in the general form of hypodermic needles, preferably made from hypodermic needle tubing, and suitably fabricated from a ferritic type of stainless steel, the sizes generally used being in the range of 16 gauge (.065" OD. x .099" wall) to 26 gauge (.013" OD. x .04" wall). The inner ends of each pair of pilot burner tubes 16 are disposed at the end of a pilot gas tube 17 receiving gas from a central header 18, suitably sup ported centrally of the range top 11, and supplied with fuel through tube-19 from the gas manifold 12, while a regulating valve 20 controls the flow of gas from the manifold 12 to the supply tube 19. A retaining nut -21'-forms1a closure orsupport member internally threaded at its lower end, where it is mounted on cooperating threads on thewend of gas supply tube 17, and is provided with two vertical bores 21a receiving the inner ends of pilot burner tubes 16, and retains them in fixed position. A small vertically extending nichrome flame stabilizing wire 22, usually having a diameter of .013" to .030", is disposed between each pair of pilot burner tubes 16 and is axially aligned with the axis of the pilot gas tube 17. The outer ends of the vpilot burner tubes or needles 16 are inwardly tapered as indicated at disposed. opposite each The foregoing structure is adapted to directly ignite range burner 11 without the use of flash tube mechanism, said burners 11 being mounted on the end of Bunsen tubes '13 and retained thereon by a bayonet locking means 26. A tower or stack 27, is provided for to the burner ports 25, thestack 27 being provided with range burner to the central pilot burners.

and an ignition port 33 intermediate to the top and bottom of the stack 27, the flow of gas from the Bunsen tube 13 to the tower 27 being through extension tube 30.

Figs. 1 and 4 iliustratethe use of my double hypodermic needle type of pilot burner at considerable distance from the range burners, usually one constantly burning pilot burner being disposed centrally of the range top, while flash tube mechanism operatively connects each My pilot burner is especially useful for this type of flash tube ignition, from a central pilot, as its flame stability is such, that normally it is virtually unaffected by the flash or concussion of the ignition.

In this form of the invention 1 illustratesimiiarrange burners 11, having ports 25, secured to the'end'of Bunsen retainedina pilot bumer housing 24, as s'hownin Pig.

4. In this embodiment of the invention the hypodermic pilot burner 15a, suitably supported and disposed centrally of the range top 11, comprises two hypodermic needles 16a receiving gas through "pilot tube 19 and having their outer ends reversely bent and disposed towards each other, while a flame stabilizing wire 22a, disposed between each pair of pilot burner needles 16a, provides a feature, whereby once the pilot burner is lighted, the wire 22a glows red, serving as a readily discernible means indicating that the burner is ignited, and also assures rapid ignition of the cold gases as they emerge from the pilot burner, thus enabling the pilot to operate on a substantially lower B.t.u. input than otherwise wouldbe possible.

For certain uses it may not be necessary to use the flame stabilizing wire 22a and such construction is within the contemplated scope of my invention. The disposition and arrangement of the

pilot burners

16 and 16a is i such, that a single flame is produced by the coalescing of the two flames at each pair of hypodermic needle ends, forming a relatively flat flame pattern indicated by the letter F in the drawing.

When the pilot burner 15 is located adjacent the range burner 11, as shown in Figs'. 2 and 3, upon operating a valve 14, gas passes through an associated Bunsen tube 13 to a cooperating range burner 11, while a small volume of such" gas passing through extension tube 30, be-

' comes ignited at the ignition port,33 by the flame at.

the pilot burner 15, the flash flame then travels up the flash slot 28 to the flash tip 29 disposed in close proximity to the main burner 11, and ignites it, as is well known in the art.

The operation of the embodiment of the invention illustrated in Figs. 4 and 5 is quite similar to that described for Figs. 2 and 3, except that flash tube mechanism 32 is interposed between the tower 27 and the pilot burner 15a, to conduct the raw gas from the Bunsen tube 13 to the pilot burner 15a, where it is ignited by the nism.

It is believed that by using two or more small pilot burner tubes, positioned and arranged in such manner that the resultant flames impinge one upon the other, a verystable flame is produced, due to the stabilizing influence of one flame on the other. By adding a flame stabilizing wire between the two flames, a-filament type of pilot burner is produced. Once the pilot burners are ignited, the flame stabilizing wire glows red, thus providing means for rapid ignition of the cool gases as they emerge from the pilot burner.

It will be apparent to those skilled in the art that the present embodiment of the invention is illustrative only and that the invention may be variously changed, used or modified without departing from the spirit of the invention or sacrificing the advantages thereof.

I claim:

1. A pilot lighter device comprising, a pair of spaced vertically extending gas tubes disposed in parallel relation to each other and fluidly connected to a source of gas at their lower ends, said tubes being formed of relatively thin-wall tubing having an outside diameter approximately within the range of .065" to .018, having an inside diameter approximately within the range of .047" to ..010" and having fine upwardly directed axial ports at their upper ends, said tubes being separated -a downwardly projecting portion, spaced at relatively by a distance approximating three times the diameter of said tubes.

2. A pilot lighter device comprising, a pair of spaced vertically extending gas tubes disposed in parallel relation to each other, separated by a distance corresponding to three times the outside diameter of said tubes and fluidly connected to a source 'of gas at their lower ends, said tubes being formed of relatively thin-walltnbing having an outside diameter approximately within the range of .065" to .018", having an inside diameter approximately within the range of .047" to .010" and having fine upwardly directed axial ports at their upper ends, and an upwardly projecting flame stabilizing wire having a diameter within the range of .013" to .030" disposed midway between said tubes, disposed in the same plane thereof and extending to at least the top margins of said tubes but not more than six times the outside diameter of the tubes above that margin, thereby providing a' single flame surrounding said wire and ports.

3.'A pilot burner device comprising, a plurality of spaced vertically extending gas supply tubes having inside and outside diameters as stated in claim 2 disposed in parallel relation to each other, said tubes being in fluid communication with a gas supply at their lower ends, the upper end portion of each tube being bent over forming short distance from each vertical tube portion and extending downwardly therefrom a relatively short distance in parallel relation thereto, said bent over portions being directed toward each other and provided with relatively small diameter downwardly-directed burner ports at their lower ends, the distance between said burner ports being such that a single low-input stabilized flame is produced around said ports and the area therebetween.

4. A pilot burner device comprising, a pair of vertically projecting parallel disposed gas supply tubes of uniform diameter, having an outside diameter substantially within the range of .065" to .018 and having an inside diameter approximately within the range of .047" to .010, connected to a source of gas at their lower ends, said tubes being spaced apart a distance corresponding to six to eight times the diameter of said tubes, the upper end portion of each tube being bent over forming a downwardly projecting portion spaced from the vertical tube portion by a distance corresponding approximately to twicethe diameter of the tube, said downwardly projecting portion extending downwardly from the top' portion of the tube in parallel relation thereto a distance corresponding to approximately two to three times the diameter of said tube, said bent over portions being directed toward each other, and provided with fine downwardly-directed burner ports at their lower ends, for the purposes described.

5. A pilot burner device comprising, a pair of vertically projecting parallel disposed gas supply tubes, having an outside diameter substantially within the range of ,.065" to .018 and having an inside diameter approximately within the range of .047" to .010, connected to a source of gas at their lower ends, said tubes being spaced apart a distance corresponding to six to eight times the diameter of said tubes, the upper'end portion of each tube being bent over forming a downwardly projecting portion spaced from the vertical tube portion by "a distance corresponding approximately to twice the diameter of the tube, said downwardly projecting portion extending downwardly from the top portion of the tube in parallel relation thereto, a distance corresponding to approximately two to three times the diameter of said tube, said bent over portions being directed toward each other and disposed in the same plane, and provided with fine downwardlydirected burner ports at their lower ends, and an upwardly projecting flame stabilizing wire, having a] diameter within the range of .013" to .030" disposed midwaybetween said pair of tubes in parallel relation thereto and extending at least to the top portions of said tubes, whereby a single r 5 6 stabilized low-input flame is produced surrounding said 1,198,006 Chance Sept. 12, 1916 wire and said tube ports. 2,143,841 Byrne J an. 17, 1939 2,319,676 Guelson May 18, 1943 References Cited in the file of this patent 2,379,5 4 Hobson July 3, 1945 5 2,470,881 Zimbelman May 24, 1949 UNITED STATES PATENTS 84,768 Russel Dec. 8, 1868 FOREIGN PATENTS 266,888 Requa Oct. 31, 1882 266,939 Germany Nov. 4, 1913