US1302914A - Pilot-light. - Google Patents

Description

N. 6,. GORE/xu.

PILOT LIGHT.

APPLICATION FILED luLYra. m1.

y mmgmh Patented May 6, 1919,

A TTOR/VEY r NITED sTATEs PATENT oEEIcE.

NELSON G. GOREAU, 0F NEW ORLEANS, LOUISIANA.

PILOT-LIGHT.

Tuscania.

Specification of Letters Patent.4

Patented May 6, 1919.

Application ledl. July 3, 1917. Serial o. 178,465.

Afor other purposes.

The principal objects of the invention are to reduce the liability of the pilot light to beextinguished; to. provide for a smaller and more economical pilot fiame; to provide a cleaner flame, that 1s one which has more perfect combustion and, therefore, does not foul the pilot burner, and to protect the pilot light from moisture.

I have found that the extinguishment of pilot lights of this class is vfrequently due not only to draftskbut to products of combustion accumulatlng in the combustion chamber, practically smothering the light' regardless of whether there is any appreciable draft of air or gas against the pilot light at the time. The present invention, therefore, seeks to protect the pilot light from being smothered by products of combustion as well asby drafts. This .is accomplished by placing the pilot light in a pocket and also by supplying pure air to the pilot light from an external source so that combustion may be supported at all times. -Acleaner flame in the pilot is permitted by this external air supply and also by novel features of the pilot burner proper.

rlhe invention provides means for carrying out the above-objects and also provides for a duplication of the pilot lights to insure lighting of the main burner even 'if one of the pilots is extinguished, and the invention further provides improved means of arranging the pilot lights in association with the main burner.

. The accompanying drawing shows one exemplifying embodiment of the invention, but after considering this it will be evident that the invention maybe embodied in .different forms, and I- do not limit myself to details except as claimed.

Figure 1 is a side elevation of a representative form of burner with two pilot lights applied thereto, one of the pilot lights and its ea connection being shown in section.

Fig. 2 is a top plan with the water shield omitted, and

Fig. 3 is a vertical section of a representative form of automatic water heater with the `invention applied thereto.

Fig. 3 shows a representative form of an automatic water heater having a combustion chamber 1, in the upper part of which is the heating coil 2. At the bottom of the combustion chamber is a pan 3 having a central opening l to accommodate the main burner 5, whose head 6 discharges flame in a (plurality of separate jets, annullarly arranged, below the baflie plate 21, which in the present invention serves the purpose of awater shield, as will later appear. The4 general organization of a water heater to which the present invention is especially adapted is more fully described in my appliczation, Serial No. 178,464, filed July 3, 191

yTo the main burner head one for more pilot lights P are secured. Each of these comprises a body 7 secured to the burner head by a screw 8. In the upper part of this body is formed a pocket 9, the opening 10 of which is substantially flush with the bottom of the main gas jets 6 and closely adjacent thereto. In the bottom ofthe pocket is screwed apburner tip 11 and the gas passage thereincommunicates with passage 12 leading downward through 'the body 7 and there communicating with a passage 13 leading to a T-connection 14:, which is employed when laplurality of pilots are used with one main burner or set of main burners. Gas is conveyed tothe stem 15 of the T-connection through any suitablepipe.' The amount of gas flowing through gas passage 13 to the burnertip 11 is controlled by a needle valve 16 suitably arranged in the lower part of the body 7 and easily accessible from below for the adjustment of the pilot. Removal of the needle valve permits the burner to be easily cleaned from below.

An air conduit 17 enters pocket 9 at one side near the bottom and this conduit communicates with an air tube V18 suitably se- 'cured to the pilot burner body 7 and extion chamber to a point Well below the pan 3, but evidently in other cases the air pipe may lead to any suitable point to insure that it Will receive fresh air.

The type of burner tip 11 which may b e employed may Vary considerably, but in a preferred construction one of the general type shown is insed, that is, one which has air-injecting lateral "passages 20. In this case the gas passage through the tip is also preferably of Venturi form that is, ithas a constricted point, land the lateral air passages 20 enter the gas passage at the point of greatest constriction.

.The baffle plate 21 forms a Water shield and is suitably mounted above the pilot lights, in this case upon the ktop of the main burner, and this shield prevents water of condensation formed Within the combustion chamber from drippinginto the pocket 10 and extinguishing the pilot.

When the needle valve 16 is properly adjusted, the pilot light burns with a small, economical blue flame which extends slightly above the top of the pocket 10. Economy and perfect combustion are promoted when an air-injecting burner tip as above described is employed. Fresh air is supplied through the pipe 18 in ample quantity to support combustionof the pilot flame, and, Where an air injectin burner isused, it will draw primary air rom this vexternal air supply through the lateral opening 20, and additional air will be furnished at the top of thegas passage to provide for c'omplete combustion. When a blue, perfect-combusjso tion pilot flame is provided for as described, the pilot flame may be made smaller than otherwise, using less gas and at the same time sooting of the burner or the pocket is avoided. When'the main burner 1s extinguished, in heaters df the type shown, a large amount of burned gases may remain in the combustion chllmber, and pilot lights as ordinarily7 constructed are frequently extinguished by the dscent of these burnt gases upon the pilot, practically smotherin it for want of fresh air. This is prevente in my Ainvention by the supply offresh air through pipe 18 to the pocket. The pocket also evidently prevents or greatly minimizes the liability to extinguish the pilot light by water of condensation reason or any drafts that may occur irrespective of the effect of products of combustion.

The location of the' il'ot li ht in a pocket ypermits 1t to be plac \of them is extinguished by unusally severe conditions, the amount of escaping gas until the main burner is again ignited is hardly noticeable either as a matter of 00st a matter of objectionable odor.

I claim l. The combination with a main burner, of a pocket adjacent thereto, a p1 ot or as burner tip Within the pocket provided with air-injecting openings, and means for supplyin' fresh air to the pocket.

2. said means comprises an air pipe communiame as claim 1', with the addition thateating with the p-ocket adjacent to the pilot gas tip and extending to a point remote from the main burner.

3. `The combination with a main gas burner of a pilot b urn'er adjacent thereto, a pocket substantially inclosing the pllot burner with the exception of an opening at the top to permit gas from the. main burner to come in contact with the pilot ame, and a shield above the pilot burner to prevent dropping upon the pilot burner. i

4. The combination with' a combustion chamber and a main gas burner therein of a lpilot burner located near themain burner,

a shield\substantially surrounding the pilot burner, a gas conduit leading-to the ilot burner andan air supply conduit. lea mg from a poitoutside the Icombustlon chamber to a point within said shield.

5. The combination .with a" main as burner of a pocket adjacent thereto, a pi ot ing to a 'point remote from the main burner.

NELSON G. -GoREAu

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