US2131701A - Gas burner - Google Patents

Description

Sept. 27, 1938.

c. A. AC-HTERFELDT GAS BURNER Filed Dec. 6, 1937 INVENTOR ATTORNEY Patented Sept. 27, 138

PATENT OFFICE GAS BURNER Carl Alexis Achterfeldt, Dusseldorf, Germany Application Deoember c, 1937, Serial No.'178, 233 In Germany November 16, 1936 s alarms.

' burners used in heating parts to be welded have been provided with a gas-air mixture which was discharged out of a longitudinal slot or a number of separate nozzles dispersing the mixture through a longitudinal channel formed by material such as stones of fireproof or refractory composition so as to direct the gas-air mixture upon the welding seam in the workpiece. In such devices the heating flame, after its contact with the weld seam, has been exhausted directly into the air in a highly 'inefllcient and uneconomical manner. As a result such devices have only been suitable forgases having a high rate of ignition and a high burning temperature.

The present invention overcomes these difliculties by conserving the heated gases, preferably through which. the combustion gases escape after contacting thematerial to be welded. In this manner the heat is concentrated and the heated outlet channels, in addition to concentrating the gas, economize in the amount of gas necessary to produce a desired temperature and make it possible to obtain such temperature rapidly even when cheap qualitygases are used which nor: mally' produce a low temperature. Furthermore, the heat collecting elements may be so arranged as to extend beyond the combustion area and serve as preheaters for the work to be welded.

Another feature of the invention is that the device is simple in construction, readily assembled from materials which areavallable and low in cost.

Although the novel features which are believed to be characteristic of this invention will be particularly pointed out in the claims appended hereto, the invention itself, as to its objects and advantages, and the manner in which it may be carried out, may be better understood by referring to the following description taken in connection with the accompanying drawing forming a part .thereof, in which:

and also so as to adjust the size of the channels Fig. 1 is a front elevation of my improved burner;

Fig. 2 is a vertical cross section of my improved burner, taken along the line 2-=2 of Fig. 1;

Fig. 3 is a detail view of an element of the invention; and v Fig. 4 is a cross section on line fl4 of th ment shown in Fig.3-

In the following description and in the claims, various details will be identified by specific names for convenience, but they are intended to be as generic in their application as the art will permit.

The burner comprises basically a mixer pipe i into which combustion gases with a desired amount of air may be fed as by the'pipes 6. Burner nozzles 2 of any desirable type such as are adapted to the gases used, serve as combustion nozzles and direct the flame toward the parts to be welded. Burner "and collector elements 3 which form a channel l3, directing the gases discharged from the nozzles 2 against a work piece 4 may be adjustably mounted in. the path of the flame to limit the size of the combustion chamber e eleand predefine the heating area and the temperature to be reached or maintained. The collector elements 3 are held in proper spaced relation by any desired means such as adjustable angle irons or other well known devices.

In addition to the gas coming through the pipes 6 which may also have air mixed therewith, heated air in such volume asmaybe desired may be fed into the feeder pipes 6 from additional feeder pipes 'l which are preferably connected to preheaterst. The preheaters 8 obtain air from any desired source, not'here'shown, and are heated by the combustion gases which pass through the channel i3 formed by the elements 3 and channels informed by passagesbetween the elements 3 and additional-collecting elements 5 made of desirable fireproof or refractory n aterialan'd mounted in any suitable adjustable bracket. The collecting elements! may be adjustably mounted and so positioned against the work mater ial 4 that all of the gases escape. through the channels Ill, or spaced from the work piece 4 so as to provide additional outlet channels it. .It can be seenthat as the mixture of gases passes through the and 3 in relation to the channels ll formed between the workpiece-4 and the collecting elements 5.

To assure proper mixture of the gases in the mixer pipe I, baiiie plates 9 may be provided.

These bailles 8, in addition to mixing the gases, may aid in expelling them through the nozzles 2 into thechannel l 3 where they ignite.

Asis shown in Fig. 1, the heat and gas collectlug elements 3 and 5 may extend beyond the combustion area. These may then serve as preheaters not only for-the pipes 8, but for the work to be welded.

In operation, the gases for ignition may be turned on and allowed to burn either with or without any working 01' the device. As the gases start to burn, it they are relatively low combustion gases, the temperature within the area defined by the collector elements 3 and .5 may be below the weldlng'temperature of the work to be welded. However, as they burn, the air in the preheaters 8 will be heated with consequent preheating of the gases of combustion. Furthermore, the collecting elements 3 will be heated and consequently the temperature of the combustion chamber defined by the elements 3 and 5 will he raised. It can thus be seen that gases which ordinarily would not produce a sufilcient temperature for welding maybe superheated to produce efi'ective welding temperature.

By prolonging the elements I and 5 beyond the combustion area, preheating chambers may be formed. Thus, the workto be welded may be preheated so that where it reaches the welding area it willbe very near its fusion point and its introduction into the combustion zone will not lower the temperature thereof substantially. Furthermore, such preheated chambers may aid materially in raising the temperature in the com bustion chamber above the temperature norm attainable.

As the elements 5 are movable, once the desired temperature within the combustion area is reached, it may be -maintained as by moving the elements 5 away from the work 4, the channels it will exhaust the desired amount of gas and prevent overheating.

While certain novel features of the invention have been disclosed and arepointed out in the annexed claims, it will be understood that various omissions, substitutions and changes may be made by those skilled in the art without departing irom the spirit of the invention. v

Having thus described and ascertained my invention I declare that what I .claim is:

1. A gas burner for flame welding, comprising a gas mixture pipe, means for supplying a combustible gas to said pipe, a plurality of discharge nozzles in said pipe. adlustable heat resistant elements adjacent said discharge nozzles defining. a longitudinal slot, said discharge nozzles adapted to discharge said mixture between said elements, additional heat resisting elements spaced from said first elements and adapted in cooperation with said first elements and a piece of mabustion chamber into which said burner discharge nozzles protrude, said gas accumulator elements defining channels therebetween adapted to exhaust the burned gases ifrom said burner discharge nozzles, preheating P pes located in the exhaust path of said gases and pipes connecting said preheating pipes to said mixer pipe.

3. A burner for welding, comprising a mixer chamber, gas inlet pipes thereto; air inlet pipes connected therewith, burner discharge nozzles therein, heat and gas accumulating elements adjacent the end of said burner discharge nozzles adiustably mounted with respect thereto to form an elongate combustion chamber, additional heat and gas accumulator elements adjustably mounted and spaced from said first elements to form a heat and gas accumulating chamber, chaniigls between said elementsadapted to exhaust e gases, said elements and said chamber extending beyond the area occupied by said burner discharge nozzles, preheater pipes located adjacent said heat accumulating elements and in the path of the exhaust channels formed between said elements, said preheater pipes connected to said gas inlet pipes.

4. A burner for welding, comprising an air-gas mixture pipe, a discharge nozzle therefor, gas

accumulating elements, air conducting pipes connected at one end to said mixture pipe and at the other end to a preheating pipe, said gas accumulating elements arranged to direct said accumulated gases upon said preheating pipe.

' 5. A burner for welding, comprising a combustion gas mixer pipe, gas inlet pipes connected thereto, air inlet pipes connected therewith, baiiles in said mixer pipes adapted to aid in mixing said air and gas, burner discharge nozzles in said mixer pipe, elongate heat resisting and accumulating elements-adjacent said burner discharge nozzles Iorming a combustion chamber, a second set oi heat resisting and accumulating elements spaced from said first elements to a heat'accumulating chamber, the spaces between said elements adapted to exhaust the gases from said chambers, preheated pipes adjacent said elements in the path of said exhaust pipesconnecting said preheater pipes and said air inlet pipes, all oi said accumulator elements extending beyond said combustion chamber forming a preheater chamber. I

CARL ALEXIS ACH'IERFEIDT.

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