US1093495A - Blowpipe. - Google Patents

Description

and MATTHEW STEEL,

- MATTHEW STEEL, SR, Ania MATTHEW STEEL; JR.,ZOF eosroi'arn, mamas.

Z'BLOWPIPE.

y Specification of Letters Patent. Patent d A Application filed May 25, E1912.- Serial No. 699,784.

To all whom it may concern. I i

' Be it known that we,-MArrHEw STEEL, Sr.,' Jr.,' subjects of the King of Great'Britain and Ireland,-resi'ding at Gosforth, land, England, (have invented certain .new and useful Improvements in Blowpipes and wedo hereby declare the following to be a full, clear, and exact description of the in vent-ion, such as will enablefiot hers skilled in the art to which it appertains to make and use the same.

- This invent-ion relates to improvements in I p1pe burners which or connected with blow are thereby adapted to be used with can bureters, the object in View being to produce the Bunsen or blow pipe flame of various grades of intensity in temperature and ex- 1 11' tent or character of flame from carbureted 2'0 1 I air and petrol gas.

In describing ourinvention we will refer to the drawing accompanying this specification in which Figure 1 is a side'elevation of a burner constructed according to our invention. Fig. 21s a sectionalview of the nozzle, and- Fig's; 3, 4 and 5' aredetail views of disks adapted to. be used within the nozzle, Fig. 6 is a sectional View of a modified form of cone shaped nozzle burner.

Behind the burner nozzle a we providetwo pipes-b b converging into one at 6 whereby the combustible gas such as carbureted air or petrol gas supplied through one, say 6 is mixed with and driven forward b'y air supplied throughthe other say b the v-isio'n being madcby united pipe 6 being about the same in bore as ch of the pipes converging into it and the h all furtherintermixture of blast air and self. At a short distance beyond this union of thetwo pipes 7 6 say equal to two or three diameters; the united pipe 6 enters or communicates with the chamber,- within the nozzle a'which chamber may convenient-1y take the form illustrated in Fig. 2 or in some cases the form illustrated .in Fig. 6. Propipe b b bureted air or petrolgas through pipe 6 and blast airthroughpipe 6 for the purposes required as hereinafter explained, the internal formation-and arrangement of the nozzle chamber'lismost important it being an essential condition for attaining the proper in the county of Northumberthat. outside air ably the larger so said. chamber a nion taking place so near to the nozzle cocks 0 0 one on each to regulate the-supply of car-J flame that the outside air is drawn inwardly through, the orifice of the nozzle into the chamber where the combustion "takes place and therefore in a state of combustion. In the absence of some restriction of the volume of carbureted air combustion cham r m the nozzle orifices would be so filled up with the escaping gases would not be drawn in; (Z is a disk for effecting this restriction by dividing oil the combustion chamber a from the mixing chamber a and thenecessaryreetriction may be effected by a central hole (l Fig. 3 perforated through the aforesaid'disk d adjusted in area the nozzle orifice, the latter being considerthat while carbureted air or petrol gas is discharged into the chamber a as-mixed with blast air in chamber a? in a suflicient volume to support a blow pipe flame, air is drawn in and down or along the in a, sufficient quantity for the purpose of supporting internal combustion. But a still better result is attained by following the arrangement of holes shown in Fig. 4 that is with a tier'or circle of holes provided in the disk around a central hole,

leaving an outer annular blank space hetweenthe circle of holes and the nozzle wall and an inner annular blank space between the circle of holes and the central hole, each I annular space being about equal in width to the diameter of the holes or about one fourth of the radius in a 2% inch diameter nozzle, or the Figs, 3 and' l may be taken as drawn to scale and. taken as examples are found to give good results, especially Fig. 4 when using carbureted air or 'petrol gas which is otherwise difii'ult to retain in a state of flame which can be applied from the nozzle in the manner poses. In j'conjun'ction with such an ar-" rangement-of holes in'the diskiit is found that a good position for the disk (Z, is that shown in Fig. 2 or about one inch within the nozzle as measured from the orifice thereof.

: i. The arrows in Fig. 2are intended to show how the currents of air. pass inwardly in a direction contrary 1to the outcoming mixture of gas'and air issuing in streamslthrou'gh the disk (Z. and the orifice of the nozzle; the outv,

streams and the nozzle wall and thereby heated and superheated and consequently exthe opposite direction to the (50 carbureted air or petrol gas which is leaving the chamber in or etrol gas passing into the in relation to the area of required for blow pipe pur side air being drawn in between the said i pended, thus giving additional or increased pressure and lntensity to the flame issuing from the interior of the nozzle or combustion chamber.

The relative total area of the holes in the disk d being correctly adjusted to the area of the orifice of the nozzle and to the capacity of' the combustion chamber the flame discharged from the burner will extend from 3 to 18 inches inlength as required according to the force with which the mixture of air and gas is blown in. If the tendency is for the flame toshow white the supply ofair is too little in proportion to the supply of gas;

if the tendency isfor the flame to go out the supply of gas is too little, and the adjustment in either case is' made by turning the cooks 0 0 I The nozzle or enlargement a is preferably made in parts a a and a so that the combustion chamber-part a may be screwed into ations in this respect are not'transmitted in their full eflect to the flame which would be the result inthe absence of such a chamher even to the extent in the-case of pedal bellows of blowing the flame out. A further advantage of such a space is that a wire gauze or closely perforated disk e Fig. 5 can be inserted between the primary disk at Fig. 3 or a and the nozzle inlet to prevent back firing which may sometimes occur as already indicated and is accompanied with a report of an undesirable character although other wise harmless. Subject to these drawbacks the nozzle may in some cases take the form' shown' in. Fig. 6 whichis useful on a small type of burner. In this modification a mixing' chamber is dispensed with and the pipe b communicates directly through a central hole into the conical shaped combustion chamber a, it being understood that the areas of the inlet hole like that in Fig. 3 bear a proper relation to the nozzle .orlfice for-effecting the induction of outside air as already described with reference to the nozzle illustrated in Fig. 2. In conclusion it should be understood that although this rev lation of the areas is that the inlet area to the combustion chamber be less than that of nozzle orifice, the nozzle orifice must neverthel'ess not be too large and the relative areas as taken from the drawing may be used as a criterion of what is suitable. It must also be understood that the mixing chamber a which is shown in Fig. 2 in what-we believe to be a very suitable form for the purposes of our invention may be modified considerably with various results or even be dispensed with entirely as shown inFig. 6, and

that anythingapproaching a generally per'- forated disk between the mixing and the combustion chamber will not do. w

Having thus described our invention, what we desire to claim and secure by Letters Pat ent in the United States is c 1. A blow-pipe burner comprising in, combination a combustion chamber forwardly converging, a llllXlIlg chamber behind the combustion chamber, a disk between the two,

said disk being provided with a central aperture and with a'series of apertures surround ng said central aperture, and radially about equidistant from said'central aperture I and the" periphery of said disk, whereby, when a combustible mixture of air and carburetedair is ignited within the combustion chamber, the streams of burning gas'are directed toward, each other and away from the walls ofsaid coinbustion chamberQ 2. A blow-pipe burner comprising in combination a tapered combustion chamber converging to a dischargeorifice, a mixing chamber behind the combustion chamber, a

disk between the two, said diskbeing providedwith a central aperture of less area than and coaxial with the discharge orifice.

there being an annular space equal at least in width to the width of the diameter of the disk aperture, surrounding said aperture,

whereby a combustible mixture of air and carbureted air, ignited 11158116. combustlon chamber is directed away from the walls of said combustion chamber, by ncoming drafts of cooling; air. I

In testimony whereof, we affixpur signa tures, in presence of two witnesses.

v i MATTHEW fiTEEL, JUNIOR.

- Witnesses;

H. W. METoAwE,

.Reenn MoLLoY.

MATTHEW STEEL, sEN1oR.--

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