US 2252320 A
Description (OCR text may contain errors)
AugflZ., '1 l-ll. G. ll-lUGI-.iEjY l j 2,252,320 MULTIJETfToRc'H CONSTRUCTION I Filed Feb. 128., 1939 ATTORNEY tatente'd Aug. 12, 1941 UNITED STATES PATENT OFFICE Howard G. Hughey,
Bloomiield, N. I., assigner to Air Reduction iCompany,
York, N.. Y., a corporation of `New York Application February 18, 1939, Serial No. 257,070
c claims. (ci. iss-27.41 Fig. 1 is a vertical view, partly in section, ci?
This invention relates to improvements in the construction ci Oxy-fuel gas torches which have a number o f oriilces supplied with gas from a common distributing chamber.
In order to distribute the gas to the different orifices evenly and thus obtain flames of substantially the same of the jet passages,- it has been proposed'that the distributing chamber be made with a cross` section that decreases as it extends away from the gas inlet passage.
The gas for all of the flames passes along the inlet end of the distributing chamber.l Some of the gas flows from the 4chamber through each of the'iet passages, however, so'that the volume of size and intensity trom allgas flowing in the distributing chamber just ahead of the last passage is only a fraction of `that which ilows through the inlet end of the chamber.- f In a Vten-llame tip, for example, the end portion of the distributing chamber that supplies gas to the last jet passage only, has a gas flow equal to only ten per cent. o! the gas flow in the other end of the distributing passage. By making the cross-section of. the distributing chamber between successive Jet passages substantially proportional to the volume of gas owing in that partl of the chamber, the velocity of the gas ilow in the chamber past each of the jet passages is equalized, withthe result that substantially the same static pressure head is obtained.
at each'passage and the gas discharged from each orifice is the same.
In its broadest aspects this invention has for its object the providing of an improved multipleflame torch,vbut a more specific object of the invention is to provide a simpler and more economical torch construction by which the desired change -in cross-section ofthe gasl distributing chamber is obtained.
In accordance. with one feature of this invention v the distributing chamber is made by closing a channel of uniform depth with of varying thicknessthat causes the cross-section o! the chamber to change throughout its length.
Another feature of the invention be pointed out as the hereof:
. relates to the y construction of tapered distributing chambers.
a multi-jet torch embodying thisinvention.
Figs. 2 and 3 are bottom and end views, re-A spectively, of the torch shown in Fig. l. A Figs. 4 and 5 are sectional views on the lines 4-4 and 5 5, respectively, of Fig. 1. i v
Fig. 6 is a vertical view, partly in section, showing a modiiled form of the invention for use in heating curved surfaces.
Fig. 'l is a fragmentary view showing aportion of the lace o'f the torch of Fig. 6.
, Figs. 8 and 9 are sectional views on the lines B--il and 9 9, respectively, of Fig. 6.'A
Fig. 10 is a vertical sectional view through another modified form of the invention.
Fig. 11 is a section on the line l|- I I of Fig. 10.
Figs. 1-5 show a heating tip comprising an elongated block 50 which is made with a channel 5| in its bottom face. there is Aa longitudinal gas passage 52 extending along the entire length of the block 50. The ends of the longitudinal gas passage 52 are closed `by plugs 53. A gas inlet opening 55 through the top of the block 5licommunicates with the longitudinal passage 52 midway betweenv the ends of the block. There is a connecting passage 58 near each end of the block, between the longiinto the channel 5l along that these end walls of the chamber 51 be integral parts of the insert 58.
and advantages of the The channel 5I has a shoulder 5| against which a corresponding shoulder on the insert 58 abuts.
The insert `58 is held in place by hard solder applied along the lines 52 where the lfaces ol the insert 58 and block 50 come together. 'The plugs 53 at the ends of the longitudinal gas passage 52 are preferably soldered to the block 50 in the same/manner.
With the exception of its endportions 59, the
" insert sa doesnot completely mi any part of the channel 51 above the shoulder 6I, and the amount that the Vinsert 58 does extend into that part of fthe channel above the shoulder 6I varies along the length of the distributing chamber 51.
The insert 58 is a wall ol varying thickness, along one side of the chamber,51, that gives the vchamber diilerent Vcross-sectional areas at different points along lits length.
Above the channel 5l Jet passages 64 extend through the insert 58. The cross-section of the distributing chamber 5I is greatest at the ends oi' the chamber adjacent the end jet passages 64. As the chamber 51 extends away i'rom the connecting passages 58 throughwhtch gas is supplied to the chamber, its cross-section decreases and reaches a minimum over the jet passages at the middle of the torch. 'I'he cross-section of the chamber is preferably proportional to the volume of gas flowing at different regions along its length.
Figs. 6-9 show a modified form of the invention for heating convex curved surfaces, and in the case of the torch illustrated, cylindrical surfaces. The torch includes two block segments 68, each with a channel 61 in its inside face. The
channels 61 are of uniform depth, and they are filled by a number of orifice blocks 68, there being three such blocks in the torch shown in Fig. 6, so that the middle block 68 extends across the juncture of the block segments 66, and holds the block segments together.
The parts are connected by hard solder. The orifice blocks are originally made with grooves in their side faces, and when the parts of the torch are first assembled, wires of hard solder 10 are inserted into these groves and the torch heated sumciently to fuse the solder and cause it to adhere to the parts.
' A narrow'channel 1| cut in the middle wall of the channel'61 starts near the lower end of each of the block segments 66 and increases in depth progressively until it reaches its maximum depth at the mid-portion of the torch. When the orice blocks 5B are in place and connected with the block segm"ents 66, they cover the narrow channels 1I andrform with those channels a distributing chamber 13 which progressivelyl decreases in -cross-section as it extends away from a central gas inlet passage 14. Gas discharges from the chamber 13 through jet passages'15 in the orifice blocks 68.
' Figs. 10 and l1 show,a torch tip in which an elongated block 40 vhas a large central recess closed by a cover plate 42 that has an insert extension 43 on its inside face. The insert extension 43 reaches to the far side of the recess and divides the recess into a longitudinal gas passage 44 and a distributing chamber 45.
The insert extension has a top surface parallel with the top wall of the central recess so that the cross-sectionof the longitudinal gas passage 44 is uniform throughout the length of the passage 44. The bottom surface of the insert 43 is not parallel with the lower wall of the recess, however, but is angular and slopes toward the center of the lower wall so that the gas distributing chamber 45 is o f minimum cross-section near its mid-portion and progressively increases in l cross-section toward both ends.
The insert extension 43 is shorter than the recess vin the torch block and leaves a-clearance 46 at both ends through which gas flows from the passage 44 to the ends of the chamber 45. Gas
.'ilows from the 'chamber 45 through jet passages 41 that open through the bottom face of the tip. The variation in the cross-sectional area is `preferably proportional to thefchange in the volume of gas flowing at the diierent regions along the length of the chamber 45.
Several embodiments of the invention have been illustrated and described, but the invention is not limited to these embodiments, and some features of the invention may be used without others.
1. In a heating torch comprising an elongated block tip in which is a recess open along a side extending lengthwise of the block, a cover member closing the open side of said recess and forming with said recess a gas distributing chamber, a plurality of jet passages opening into said chamber at spaced points along its length and through winch gas from said chamber is discharged through oricesin the face of the tip, and a gas inlet passage opening into'the distributing chamber, said cover member having a portion of varying thickness along its -length located along a side of the chamber and reducing the open cross-section of the chamber progressively along the length of said chamber as the chamber extends away from the inlet passage. l
2. A heating torch comprising an elongated block having a channel in its bottom face, a gas inlet leading into said channel, and walls closing the ends and bottom of said channel to form a distributing chamber, the bottom wall comprising an insert that varies in thickness along its length to reduce the cross-section of the distributing chamber as it extends away from the gas inlet, and iiame jet passages opening through the insert.
3. A heating torch including an elongated block with a recess in one side and jet passage extending through the bottom wall of the recess and the bottom face of the block, a gas inlet conduit opening into the top of the recess, a cover plate on the side of the blockclosing the recess and forming an enclosed space within the torch, and an extension on the inside face of the cover plate dividing the enclosed space into an upper longitudinal gas passage into which said gas inlet conduit opens, and a lower gas distributing chamber into which the jet passages open, said extension terminating short of the ends of the recess, to leave the upper passage and lower chamber in communication.
4. A torch for heating curved surfaces, said torch including two arcuate blocks connected together to'form a continuous arc, channels in the faces of said blocks, the channel in each block being of increased depth as it approaches the other block, a gas inlet conduit that supplies gas to both channels in the region where the blocks meet, and a plurality of orice blocks partially filling the channels and forming with said channels gas distributing chambers that decrease in cross-sectional area as they extend away from the inlet conduit.
-` 5. An larcuate heating torch comprising two members including a block with a channel in its bottom face, and an insert tting within the channel and forming with said channel a distributing chamber, one of said members being of variable cross-section so that the walls of the distributing chamber converge along the vlength of the chamber, a gas supply conduit sage through'which gas enters the chamber, and
the cross-sectionalarea of the chamber at each of. the jet passages approximately proportional to the' volume-of gas ilowingat that polnt,the improvement which comprises a. composite block tip including two sections that are connected together and one of which includes a recess that i 2,252,32o I V3 forms. when-covered -by the other'section, Vthe parallelism so as Vto obtain the tapered crossl Section ot -said distributing chamber.
' --HQWARD G. HUGHEY.