US 1048716 A
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APPLICATION FILED rL'B.19, 1912.
Patented Dec. 31, 1912.
INA ArNT IP Jam H-MARTIHDALE ATTEJT W State of Ohio,
UNITED STATES PATENT OFFICE- JOHN H. MARTINDALE, OF LAKEWOOD, OHIO, ASSIGNOR 0F ONE-HALF -TO EDWARD G. GILBERT, OF LAKEWOOD, OHIO.
To all whom it may concern:
Be it known that I, JOHN H. MARTINDALE, a citizen of the United States, residing at Lakewood, in the county of Cuyahoga and have invented certain new and useful Improvements in Gas-Burners, of which the following is a specification.
My invention relates to a gas burner, and the invention comprises the construction and arrangement of parts substantially as hereinafter described and more particularly pointed out in the claims.
The object of the invention is embodied in the means substantially as herein shown, whereby a perfect mixture of air and gas and perfect combustion can be maintained at one point while separate supply of the air and gas and control thereof is at a distant point. I
The device is particularly designed to mix the air and gas in a uniform ahd thorough manner and in proportionate predetermined quantities with unvarying certainty, forcing both the air and gas into the mixer and burner under fixed pressures and under control of separate valves, which, however,- are to be jointly operative.
In the accompanying drawings, Figure 1 is a plan view of a set of my improved devices connected by pipes to an air and gas-distributingmanifold. Fig. 2 is a sectional view, ona larger scale, of a single mixer and burner with the manifold and connecting pipes and valves, the pipes being broken to bring the parts into close relations. Fig. 3 is a sectional view of one of the valves which are 1n duplicate but of different sizes.
My invention is of especial value for brick kilns using gas as a fuel and wherein the gas burners are bricked in or covered or otherwise inaccessibly located and the s pply "of air and gas and the control ereof necessarily placed at a distant point, say fifty feet, more or less, away from the burners. The combined burners and mixers /2 may be of any number and are variously placed in the kiln, Fig. 1 showing an arbitrary arrangement of the burners to convey this idea and to. illustrate that necessity often compels the use of different lengths of air pipes 3 and gas pipes 3 to connect the burner with a source of air and gas supply, which is through a manifold 4 having a central division ,wall 5 to provide separate air and gas chambers 6 and 7 respectively Patented Dec. 31, 1912. serial No. 678,620.
therein. Intake of air and gas into said chamber is by pipes 8 and 9 at the ends of manifold 4. Burner 2 is preferably constructed with an offset 10 to receive pipe 3, the longer portion of mixer-body 11 of the device having a pipe 12 extending therethrough from -end suitable distance at its outer end to provide a discharge or burner nipple 14 for the mixed air and gas, and specifically speaking, the nipple 14 is the burner. proper of the device and may obviously be of other form than of the blow-pipe type as shown. Pipe 12 is closed at its ends to the interior of the mixer-body 11, but otherwise open thereto through a series of small perforations 15 which are located at equal distances apart spirally around the pipe within mixerbody 11. This spiral arrangement of openings is deemed important to obtain a thorough and uniform mixing of the air and gas. Thus, it is well understood that it is a difficult matter to thoroughly mix air and gas in absolutely fixed proportions and uniformly changing conditions, particularly when the flow and pressure thereof is controlled from a distant point. However, by having openings 15 spirally arranged, the air will pass into the line of gas at a series of radial points successively located one in advance of each other, whereby the air will, in a to endand projecting a for protracted operations and under sense, streak along with the gas and be thoroughly commingled therewith and uniformly distributed therethrough by the time the full length of the pipe covered by said openings is traversed by the gas. This distance may be approximately a foot for a three-fourths inch gas pipe, and the desired result is further induced by definitely fixing the proportions of air and gas to be mixed. This is accomplished in the present instance by a plug 16 having an opening 17 of the requislte diameter centrally therethrough, and which plug 16 is interposed between pipe 12 and pipe 3 withinboss 18 on mixer-body 11. The number of openings 15 in pipe 12 is more or less dependent upon the size of opening 17 in plug 16 and to the richness of the gas, and in practice the right amount of air to that of gas is obtained by analyzing the gas and then fixing the number of air openings to be used so as to obtain the proper mixture.
In the nature of things, the amount of 1 valve is manipulated by a key air used must exceed the amount of gas and for this reason pipe 3 is much larger than pipe 3, and the valves 18 and 19 for the air and gas pipes 3 and 3, respectively, are also of a size and character to proper tionately control the flow of each.- Moveover, as fixed and predetermined portions of air and gas are taken care of by the burners it is desirable to control the flow of air and gas simultaneously and in the same proportionate degree. This I accomplishby uniting the respective plugs of the two valves 18 and 19'by a sleeve 20 which compels common rotation when the upper Each air and gas valve-plug is therefore also provided With two or more cross-passages 20 and Q1 of different diameters, whereby the flow of air and gas may be positively regulated in different degree by a full opening of either one or the other of passage 20 and 21, said. passages being angularly-related to admit of one being open while the other remains closed. The plug openings in valve 19 are proportionately smaller th an the openings in the plug of valve 18. Each burner and mixer 2 has two pipes and two valves as described, with the valves preferably located adjacent to the manifold L where anyone set or all of the valves may be turned on or off at will the manifold l being located in any desired and convenient place, although generally distant f1()l' tll6 burners. The air and gas is forc d to the burners under pressure, and fi'v l0 eight ounces pressure is generally suflieient for all purposes. The air pressure may sligl'itly exceed that of the gas, or be approximately equal thereto to assure a free and full discharge of the perfect cox-nbustible mixture at the mouth of the nipple l t. With this device I do not have to de pend upon the uncertainties of a stack for a draft and supply of air, and the air may be taken into the manifold from an outside source where the air is pure and fresh and with consequent better results atthe burner.
\Vhat I claimis: v 1. A burner and mixer comprising a hollow body having an offset and an air supply pipe leading thereto, a gas-supply pipe extending through said body and projected thcrefronr at one end and having a series of air-intake openings longitudinally thereof, and a removable plug for said gas pipehaving a gas-intake opening therethrough.
2. A burner andmixer comprising a hollow body having separate air and gas pipes leading thereto, 'a pipe extending through said body having a series of ipirally arranged openings and pro ected fronrsaid body at one end and connected with said gas pipe at the other end and. provided with a reduced gas passage for intake of gas.
In testin'iony whereof I afiix my signature in presence of two witnesses. Y
JOl'lN l-l'. MARTINDALE.
lVllllCSS'CS R. B. Mosnn,
F. C. Mossux.-