US2144894A - Pilot burner arrangement - Google Patents

Description

Jan. 242 1939. T E, PHARES 2,144,894

PILOT BURNER ARRANGEMENT Filedv March 27, 193s PHE Patented Jan. 24, 1939 PATENT oEFIcE PILOT BURNER ARRANGEMENT Thomas Esta Phares, Shelbyville, Ind., assigner to Chambers Corporation, Shelbyville, Ind., a

corporation of Indiana Application March 27, 1936, Serial No. 71,113

1 Claim.

My invention relates to pilot lights used on gas-burning equipment, such as gas-ranges, and particularly to a pilot-light arrangement of the explosion type. In this type of pilot-light, a supply of gas from the burner is mixed with air to form an explosive mixture and conveyed through a tube to the pilot burner. When the explosive mixture reaches the pilot burner, the gas within the tube explodes and creates a. flame which serves to ignite the burner.

I have found that equipment of this kind now available, while it may be satisfactory for gas of one of the three kinds no-w being used (natural, artificial, and bottled) will not operate satisfactorily with gases of other kinds due largely to the difference in proportions necessary to create an explosive mixture. It is the object of my invention to apply to pilot-light equipment of the explosive type means which will adapt the equipment for use in connection with burners burning different kinds of gas.

In carrying out my invention, I provide means for varying the eiective area of the opening through which air is admitted to the explosion tube. In the preferred form of my invention, where a jet of gas enters the explosion tube through an opening in the lower wall thereof and serves also to induce a flow of air through such opening, my invention conveniently takes the form of a sleeve which surrounds the explosion tube and which by longitudinal adjustment thereon varies the effective size of the opening in the wall of the tube.

The accompanying drawing illustrates my invention: Fig. 1 is a plan View of a portion of a gas range showing a single burner and the pilotlight equipment associated therewith; Fig. 2 is a fragmental view similar to Fig. 1 with parts of the explosion tube broken away to show in horizontal section; and Fig. 3 is a vertical section on the line 3-3 of Fig. 2.

In the gas range, a portion of which is shown in Fig. 1, the main burners are supplied with gas from amanifold I0. Only one burner I I is shown in Fig. l, but it will be understood that any desired number of burners may be embodied, each being supplied with gas from the manifold I under control of a valve I2.

Also supplied with gas from the manifold I0 is a pilot burner I3, the supply of gas to which may be regulated by a valve I4.

The pilot burner I3 is conveniently centrally located with respect to the burners of the stove, and an explosion tube extends from each of such burners to a point adjacent the pilot burner. As

indicated in the drawing, each explosion tube is formed of two telescoping parts I5 and I6 in order that the tube may readily be adapted to ranges of different dimensions. Near its outer end, each of the tube-parts I6 is provided with a downwardly projecting boss I1 the lo-wer end of which is conical in shape to conform to a tapered hole provided in the upper wall of the associated burner II. Thus, the outer end of each of the explosion tubes is supported on its associated burner, while the inner end receives support from the housing usually provided for the pilot burner.

Both ends of each explosion tube are open; and, in addition, the tube-part I6 is provided in its lower surface with an opening I8 the outer end of which is located adjacent the boss II. The boss II is provided with a downwardly opening recess with which there communicates a discharge port I9 adapted to direct from the burner I I a jet of gas which rises obliquely upwardly toward the opening I8.

The construction as so far described is old. In operation, the pilot burner burns continually. When any of the valves I2 is opened, gas is supplied tothe associated burner II. On its way to the burner II, this gas becomes mixed with sufcient primary air to produce a satisfactorily combustible mixture which is too rich in gas tobe explosive. Some of the combustible mixture of gas and air is discharged through the port I9 and rises through the opening I8 into the interior of the explosion tube. The jet of gas emerging from the port I9 induces an inward flow of air through the opening I8, the opening I8 being of such a size that the amount of air admitted will create an explosive mixture within the explosion tube. When this explosive mixture lls the explosion tube and emerges from the inner end thereof adjacent the pilot burner I3, it is ignited; and, when the resultant burst of flame emerges from the outer end of the explosion tube, it ignites the gas emerging from the ports of the burner II.

I nd that in order for a device oi this kind to operate satisfactorily the effective area of the opening I8 will differ materially with the type of gas used. To render the pilot-burner equipment adaptable for use with gases of different kinds, I therefore provide means for adjusting the eiective size of the opening I8.

In the device illustrated in the drawing, the means employed for varying the size of the opening I8 takes the form of a sleeve 28 which surrounds the tube-part I6 and is longitudinally adjustablethereon. To aid in deecting gas and air into the explosion tube, the lower Wall of the sleeve 2D, at its outer end, may be bent downwardly to provide an inwardly and upwardly sloping tongue 2 I, as indicated in Fig. 3.

It will be apparent that by longitudinal adjustment of the sleeve 20 upon the tube I6 the effective area of the opening I8 may be regulated to Vary the amount of air whichis admitted into the explosion tube with gas from the port I9. It thus becomes possible to produce in the explosion tube and explosive mixture of gas and air, irrespective of the type of gas supplied to the burner I I. For gases in which the explosive mixture is relatively lean, the sleeve 20 is moved inwardly to increase the eiective area of the opening I8 thus increasing the quantity of air which enters the explosion tube with the gas. If the gas supplied to the burner I I is one which requires a relatively small quantity of air to produce an explosive mixture, the sleeve 20 is moved outwardly to decrease the effective area of the opening I8 and to decrease correspondingly the amount of air which enters the explosion tube: with the gas.

- I claim as my invention:

In combination, a main gas burner and a pilot burner remote therefrom, said main burner being provided in its upper wall with an auxiliary port, an explosive ignition tube extending from said main burner to said pilot burner and having in its lower wall adjacent said auxiliary port an opening for admission of gas from said port and of air, and a. sleeve slidable upon said explosion tube to Vary the effective size of said opening, the lower wall of said sleeve extending obliquely downward toward said port.

THOMAS ESTA PHARES.

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