US2129681A - Blowpipe nozzle - Google Patents

Description

"F. c. GEIBIG BLOWPIPE NOZZLE Filed May 18, 1954 Sept. 13, 1938.

l PL

INVENTOR FRANK ass/51s ATTORNEY Patented Sept. 13, 19 38 uurrso stares PATENT orFicE mesne assignments, to Union Carbide and Carbon Corporation, a corporation of New York Application May is;

' 3 Claims.

This invention relates to blowpipe nozzles and particularly to multiple flame, fluid-cooled nozzles.

Heretofore such nozzles have been cast and.

the passages for conducting gases and cooling fluid have been drilled in the nozzle. method of constructing the passages is relatively expensive and does not provide a sufficiently flexible arrangement of the passages for all types of nozzles, particularly for the multiple flame nozzles such as are used in welding machines, because the passages can be drilled only in straight lines and any change in thedirection of the gas is usually abrupt which causes irregular flow of the gas streams and in turn produces a poorly shaped flame.

In such multiple flame nozzles the flame producing gasesare distributed from thedistributing chamber to individual gas flame-forming passages. In some nozzles. it is impractical to locate the inlets of such drilled passagesin the distributing chamber so that the pressure of the gas delivered to said chamber will be exerted equally in all of said inlets and distribute the gases equally among the individual flame-forming passag es.

Where the cooling fluid passages and the gas passages are drilled in the nozzle, the greater portion of the volume of the nozzle is solid metal. That condition reduces the volume of cooling fluid which may be retained in the nozzle andcirculated freely about the gas passages and the nozzle block adjacent to the flames, and it also increases the thickness-of the metal which separates the gas passages from the cooling fluid passages and thereby reduces the cooling eificiency tribute gas uniformly among a plurality of gas jets and to convey the gas from a distributing chamber to thejets in a smooth uninterrupted flow. I

A further object of this invention is to provide an improved means for cooling the 'blowpipe noz zle and the gas passages therein.

The above objects and other novel features of this invention will be more clearly understood from the following description and accompanying drawing, in which:

Such a 1934, Serial No. 726,216 (Cl. iss er's) Fig. 1 is a rear end elevation view of a blowpipe nozzle embodying this invention;

Fig. 2 is a cross-sectional view on line 22 in Fig. 1, looking in the direction of the arrows; and

Figs. 3 and 4 are, respectively; cross-sectional views on lines 3-3 and i l in Fig. 2, looking in the direction of the arrows.

The principles of this invention are illustrated in the blowpipe nozzle N disclosed in the accompanying drawing.

The nozzle N comprises a nozzle block B having a set of preheating tips H and welding tips W connected thereto which are adapted to directa plurality of preheating and welding flames upon the work for preheating and fusing the portions of the metal to be welded together. Another tip P, supplied with a combustible gas mixture from a mixer M, is secured in'the rear end of the block B for protecting the rear portion of the puddle of weld metal from the air and for normalizing the weld. A combustible gas mixture such as a mixture of oxygen and acetylene is supplied to the preheating tips H and welding tips W from a gas mixer (not shown) which may be connectedto the inlet Lofa distributing chamber C in a distributor head D from which the gas is conducted through tubes T to the tips H and W. The tubes '1 and the block B are cooled by a cooling fluid which is circulated in a jacket J.

The distributor head D and the nozzle block B are made of a good heat-conducting material such as copper or an alloy thereof. The parts are preferably cast and machined to receive the parts cooperating therewith. Outlet passages It are boredthrough the bottom wall i i of the distributing chamber C substantially equally distant from the-center of the gas inlet I so that the velocity head of the gas entering the distributing chamber C will besubstantially equal in all of the outlets it and thereby cause the gas to be transferred through each of the outlets with equal velocity to each of tips H and W.

,In order to further assist in. distributing the gas uniformly among or with an equal velocity to the tips H and W and to facilitate smooth flow and uniform distribution of the gas stream within the chamber C, a dome or conical projection i2:

is formed in the bottom of the chamber to direct the gas smoothly to the outlet passages I'll, while preventing or limiting the formation of side or eddy currents.

The outlet passages ill in the distrlbutor'head D are counterbored to receive, the upper ends I struction of the gas passages. arrangement of the tips'or the flame-forming of the gas tubes T and the lower ends of the tubes T are received in counterboresof the passages i3 bored in the block B which receives the shanks M of the tips H and W. The tubes T may be silver soldered in the counterbores in the distributor head D and in the nozzle block B. i

As shown in Fig. 4, the outlet passages iii from the distributing chamber C are arranged on a single circle concentric with the inlet I, and as shown in Fig. 2, the tip passages iii in the nozzle block B are arranged in a-straight'line, and the respective passages it and iii in the distributor head D and the nozzle block B are inclined at an angle to each other.

In order to connect the non-aligned passages H3 and it so that the gas may be transferred from one to the other without producing objectionable eddy currents in the gas streams, the tubes are made of yieldable material such ascopper, or other suitable metal or alloy, which may be bent or flexed in the form .of smooth or streamline curves between the non-aligned passages without causing collapse of the tubes and while maintaining the original cross-sectional area of the passages therethrough. Such construction provides a relatively inexpensive means of ,forming smoothly curved gas passages anda flexible arrangement of the gas jets in respect to the outlet passages leading from the distributing chamber C, without complicating the con- For example, the

passages in the block B is not limited by the shape of the distributing chamber C because the individual tubes T may be bent to conform to the pattern of the tips selected, whether they be arranged in single-or double rows, or circles, or other configurations.

The mixer M for the protectingtip P is supplied with oxygen and a combustible gas, such as acetylene, through tubes I5 and I6, respectively connected to the rear end of the nozzle block B.-

Thegases are mixed in the mixer throat i! to form the combustible mixture which is delivered to the protecting tip P.

The walls of the gas conducting tubes T are preferably made of relatively thin copper or other good heat-conducting material and are enclosed. in the jacket J which comprises the bottom wall II of the distributor head D, the top wall l8 of the block B, and a sheet metal piece l9 silversoldered .or otherwise connected with a fluidtight joint to the outer walls 20 and 2| of the distributor head D and the block B, respectively.

The cooling fluid is supplied to the jacket J through an inlet tube 22 which extends through a bore in the rear end of the block B and delivers the cooling fluid adjacent to the top wall i8 of the nozzle block B near its rear end where it is subjected to its greatest amount of heat The cooling fluid is conducted away from the top of the cooling jacket J by an outlet tube 23 which extends through a bore in the rear end of the block B and upward to the top of the jacket where it is provided with an inlet opening 24 which receives the cooling fluid from the jacket J. It will be noted that this,construction provides an efllcient cooling system, since the walls of the tubes T are made of relatively thin, good heatconducting material about which a relatively large volume of water is freely circulated in intimate contact therewith and with the nozzle block B.

In order that the gas passages i3 and ill in the block B and distributor head D may be maintained at a suitable temperature by the cooling fluid, grooves or channels 25 and 26 are formed in each of these members adjacent to the side and end margins of the top wall iii of the block B and the outer margins of the bottom wall ll of the distributor head D. The block B is also 5 provided with a passage 27 which extends between the grooves 25 on opposite sides of the vblock B and underneath the mixer throat ii for preventing the gases which flow therethrough to the protecting tip P from being overheated. 10

The gas inlet tubes 55, it for the mixer M and the inlet and'outlet tubes 22, 23 for cooling fluid extend upward from the rear end of the block B parallel with each other and are enclosed in a casing 28 which is secured to the block B. 15 While one embodiment of this invention is shown and described herein it will be understood that changes in the details may be made without departing from the scope of the invention as described in the appended claims. Certain features disclosed but not claimed herein form the subject matter of the copending applications of J. H. Bucknam, Serial No. 718,474 and Serial No. 728,133.

I claim: 2

l. A blowpipe nozzle comprising a nozzle block having a row of gas passages extending therethrough; said nozzle block having grooves formed therein, one on each side of said row. of gas passages; a header having a gas distributing 30 chamber therein; said distributing chamber having an inlet thereto and outlets therefrom; tubes connecting said outlets in said distributing chamber to said passages in said nozzle block; a cooling fluid jacket enclosing said tubes; said jacket 35 comprising, the bottom wall of. said header, the top wall of said nozzle block and a metal. wall secured to said header and the outer wall of said grooves in said nozzle block; said block having a pair of bores extending through its rear wall; a cooling fluid inlet tube extending through one bore of said pair and adapted to discharge cooling fluid into said jacket adjacent to the top wall of r the nozzle block; a cooling fluid outlet tube extending through the other bore of said pair into said jacket and having an opening adjacent to the top of said jacket; a mixer within the nozzle block, gas supply tubes for said mixer extending alongside said cooling fluid tubes; and a sheath secured to said block and enclosing said gas supply and inlet and outlet cooling fluid tubes.

2 A blowpipe nozzle comprising a nozzle block having a row of laterally aligned gas passages extending therethrough; a header having a gas dls- 55 tributing chamber therein; said distributing chamber having an inlet thereto and outlets therefrom; tubes of yieldabl'e material connecting said outlets in said distributing chamber to said passages in said nozzle block; a cooling fluid jacket enclosing said tubes; said nozzle block having a gas mixer in its rear end and having channels for cooling fluid on each side oisaid er and extending lengthwise of said block 11 opposite sides of said row of gas passages} 65 said block having a bore for cooling fluid extend- "ing between said channels and beneath said mixer; said block having a pair of bores exten ing through its rear wall, one on each side 0 a said mixer; a cooling fluid inlet tube extending through one bore of said pair of bores and adapted to discharge cooling fluid into said jacket adjacent to the top wall of said nozzle block; and

a cooling fluid outlet tube *extending through the other bore of said pair of bores into said jacket and having an inlet opening adjacent to the top of said jacket.

3. A blowpipe nozzle comprising a nozzle block having a row of gas passages extending therethrough; a header having a gas distributing chamber therein; said distributing chamber having an inlet thereto and outlets therefrom; tubes connecting said outlets in said distributing chamber to said passages in said nozzle block; a cooling fluid jacket enclosing said tubes; said nozzle block having a gas mixer in its rear end and having channels for cooling fluid on each side of said mixer and extending lengthwise of said block on opposite sides of said row of passages,

through the other bore of said pair of bores into 10 said jacket and having an inlet opening adjacent to the top of said jacket. 1

FRANK C. GEIBIG.

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