US1750616A - Burner for natural gas - Google Patents

Description

March 11, 1930. WQ cEQY 1,750,616

' mURuEfi'FFoR NATURAL GAS F1195 j Jan. 10, 1929 I INVENTUR PIN ATTORNEY Patented Mar. 11, 1930 UNITED STATES Ufdl [SHI'CI PATENT OFFICE PHILIP W. MCCOY, OF TOLEDO, OHIO, ASSIGNOR TO THE SURFACE COMBUSTION COM- PANY, INQ, OF TOLEDO, OHIO, A CORPORATION OF NEW YORK BURNER FOR NATURAL GAS Application filed January 10, 1929. Serial No. 331,541.

This invention relates to improvements in gas burners and more particularly to gas burners adapted to burn premixed natural gas and air.

The invention has for its object to provide a burner of the character indicated which shall not back-fire through the burner feed passages into the mixture supply manifold regardless of how low the turn-down may be and which shall not blow ofl at the tip when the burner is operating at maximum capacity regardless of such factors as would ordinarily cause the flame to blow off.

Referring to the drawings wherein the preferred embodiment of the invention is illustrated Fig. 1 is an axial section through the burner;

Fig. 2 is a bottom plan view thereof; and

Fig. 3 is a radial cross section through the burner.

In the drawings, 10 indicates a cylindrical plug surrounded by and supported in a tubular body 12 in a manner to form an annular feed passage 14 for the mixture to be burned. One end of the body 12 is exteriorly threaded as at 16 to permit the burner to be screwed into a manifold not shown. The plug 10 extends into a relatively shallow well or pit of considerably greater diameter than the bore in which the plug 10 is positioned. Projecting radially from the top of the plug 10 is a flange or baflle 20, the rim thereof being in spaced relation with respect to the sides and bottom of the well whereby an open path is formed between the feed passage 14 and the well 18. The underside of the baffle 20 is preferably concave as at 22 and the bottom of the well preferably slopes upwardly and outwardly from the feed passage 14 as indicated at 24.

The plug is maintained in concentrically spaced relation with respect to the bore of the body 12 in any suitable manner as by means of spacer wires 26 which extend in parallelism with the axis of the plug. To facilitate assemblage of the parts, the wires are preferably bent into U form, the bottom of the U being disposed across the bottom of the plug and the plug forced into the bore of the member 12 as will be readily understood. Instead of using wires for the purpose aforesaid, there may be provided either on the plug or on the interior of the bore radially extending ribs 26 arranged in parallelism with the axis of the plug as will be readily understood. The feed passage 14 is made sufiiciently small to prevent back flash or flame propagation therethrough un der any conditions of operation of the burner. A cross pin 28 is preferably provided to prevent any possibility of relative axial displacement between the plug and the member 12.

Both the plug and the body 12 are preferably formed of a resisting alloy in order to more effectually withstand the high temperatures produced by the burning of the gaseous mixture.

The mode of operation of the burner is substantially as follows: The natural gas and air are premixed in any suitable manner by apparatus not shown and the mixture delivered under pressure to the inlet of the burner below the plug 10. The mixture enters the annular passage 14 and impinges against the underside of the baffle 20. The curvature of the baffle directs the mixture impinging thereagainst toward the sloping floor of the pit with the result that sufficiently violent swirling and agitation is set up in the mixture, to cause the mixture to completely fill the pit instead of leaving the pit in the form of a tube as it otherwise would. The result is that when the mixture is ignited the flame tends to hug the burner tip even though the differential pressure between the atmosphere and the mixture leaving the feed passage 14 is relatively great. Blow-off of the flame is therefore practically impossible under any conditions of operation. Back-flash cannot occur because the size of the passage 14 is too small to permit flame propagation therethrough.

The mixture of fuel gas and air is such that a substantially perfect mixture is produced. That is to say, the air and gas are so proportioned that there is suflicient air for complete combustion. Such mixtures burn with a vary short bluish flame and unless the burner is properly designed, will blow-off at the slightest provocation. The present,burner is susceptible of operation over a relatively great range of turn-down and there is not the slightest tendency for the flame to blow off even though the mixture supply should be suddenly increased.

As previously stated, the burner finds its special utility with preformed mixtures of air and natural gas.

What is claimed is:

l. A gas burner for premixed gas comprising a cylindrical plug, a tubular body within which said plug is supported in close concentrically spaced relation to provide an annular feed passage for emitting a thin annular sheet of the gaseous mixture to be burned, a radial battle on said plug against which the annular sheet impinges upon issuing from said feed passage, and a relatively shallow well within which said battle is positioned in spaced relation with respect to the sides and bottom of the well.

2. A gas burner for premixed gas comprising a cylindrical plug, a tubular body within which said plug is supported in close concentrically spaced relation to provide an annular feed passage for emitting a thin annular sheet of the gaseous mixture to be burned, a radial battle on said plug against which the annular sheet impinges upon issuing from said feed passage, and a relatively shallow well within which said bafile is positioned in spaced relation with respect to the sides and bottom of the well, the underside of the baflie having a shallow recess.

3. A gas burner for premixed gas comprising a cylindrical plug, a tubular body within which said plug is supported in concentrically spaced relation to provide an annular feed passage for the gaseous mixture to be burned, a radial battle on said plug against which the mixture impinges upon issuing from said feed passage, and a relatively shallow well within which said battle is positioned in spaced relation with respect to the sides and bottom of the well, the underside of the baflie being concaved.

4. A gas burner for premixed gas comprising a cylindrical plug, a tubular body within which said plug is supported in concentrically spaced relation to provide an annular feed passage for the gaseous mixture to be burned, a radial battle on said plug against which the mixture impinges upon issuing from said feed passage, and a relatively shallow well within which said bathe is positioned in spaced rela tion with respect to the sides and bottom of the well, the cylindrical portion of the plug continuing an appreciable distance into the well, the bottom of the well sloping upwardly and outwardly from beneath said baifie.

5. A gas burner for premixed gas comprising a. cylindrical plug, a tubular body with in which said plug is supported in concentrically spaced relation to provide an annular feed passage for the gaseous mixture to be burned, a radial battle on said plug against which the mixture impinges upon issuing from said feed passage, and a relatively shallow well within which said battle is positioned in spaced relation with respect to the sides and bottom of the well, the bottom of the well sloping upwardly and outwardly from beneath said battle, and the underside of said battle being curved outwardly and downward ly so as to tend to direct the impinging mixtulfi downwardly against the bottom of the we 6. A gas burner for premixed gas comprising a tubular body which for a portion of its length has a bore of one diameter and for another portion thereof has a bore of lesser diameter, a cylindrical plug positioned within the smaller bore in concentrically spaced relation to provide an annular feed passage for feeding a thin annular sheet of the mixture to be burned, said cylindrical plug projecting an appreciable distance into the larger bore, a radial battle on the end of said projecting portion of the plug, said baflle being spaced from its surrounding walls to establish a flow passage for the mixture from said feed passage to the space above the baflle.

In'testimony whereof I affix my signature.

PHILIP 7M. MCCOY.

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