SU1518093A1 - Gas-oxygen torch - Google Patents

Abstract

The invention relates to thermal cutting and is intended for gas-oxygen mechanized cutting of steel blanks. The purpose of the invention is to improve the quality of the preparation of the combustible mixture. A cigar-shaped needle 13 is installed in the main channel 8 for supplying the combustible mixture. A mesh 12 is installed in the mixing chamber 5. The needle 13, by splitting a cylindrical flow into an annular stream, accelerates the mixture like a Laval nozzle and some turbulization. The flow vortices are absorbed by the net 12, with which the mixture is actively stirred. 2 Il.

Description

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The invention relates to thermal cutting, in particular to cutting torches for oxygen metal cutting, and can be used for mechanized cutting of steel billets, incl. high temperature, both acetylene and substitute gases can be used as combustible gas.

The purpose of the invention is to provide an improvement in the quality of the preparation of the combustible mixture.

FIG. 1 shows a cutter, a longitudinal section; in fig. 2 shows section A-A in FIG. one.

The cutter contains a Nlosa housing 1 with a main mouthpiece 2 for forming a cutting oxygen jet and a sleeve 3, which together form the channels 4 for the exit of the combustible space. The case I, the sleeve 2 and the sleeve 3 form an annular mixing chamber 5 to form a uniform mixture of preheating oxygen and combustible gas, which are fed through channels 6 and 7, respectively. Case 1 has two channels 8 and 9, made perpendicular to the axis of the main mouthpiece 2, into which the injectors 10 and 11 are installed and which are connected with channels 6 and 7. Channel 8 is cylindrical and communicated with the mixing chamber o, in which the grid 12 is installed, while in the channel 8 a cigar-shaped needle 13 is installed, and 9 is in communication with the nozzles 14 of the additional mouthpiece 15, vyu.shennogch) in the lower part of the housing 1. Do- 11o, 1nite, 1nuyu heating the cutting line. The nozzle 16 of the additional mouthpiece 15 is extended, replaceable and installed under the shaft to the axis of the main mouthpiece 2 and is intended for the advanced heating of the front cut edge. Ptutsers 17, 18 are screwed into the upper part of the housing 1, in which check valves 19, 20 and 1 pump 21, 1 are installed, connecting the cutter with rubber-fabric sleeves, through which respectively heated oxygen, combustible gas and cutting oxygen are fed into the cutter. The housing 1 has an opening 22 for fastening and adjusting the position of the cutter before cutting, as well as the plug 23.

The cutter works as follows. The cutting oxygen enters through the brush 21 into the channel of the main mouthpiece 2, where a jet forms, which flows to the metal being cut. Under-oxygen supply through the nozzle 17, pressing the check valve 19, flows through the channel 6 to the injector

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tori 10 and 11. Combustible gas through choke 18, pressing check valve 20, is fed into channel 7, from where it is injected into channels 8 and 9 by oxygen jets flowing out of injectors 10 and 11, resulting in a combustible mixture in channels 8 and 9 . Channel 8, which is injecting, is cylindrical and contains a cigar-shaped needle 13, which accelerates the flow of the mixture using the effect of the Lavel nozzle and breaks it against the net. At the same time, a cigar-shaped needle by dividing a cylindrical stream into an annular stream at the beginning of the channel improves its mixture formation due to compaction and some turbulization at the other end of the needle. The flow vortices formed in the channel are easily absorbed: by the mesh.

From channel 8, the mixture enters the mixing chamber 5, where with the help of grid 12 due to crushing of the jet, the formation of a homogeneous combustible mixture is completed, which through channels 4 expires on the metal being cut and forms the torch of the main mouthpiece 2. Combustible sms from channel 9, the passage through the nozzles 15 of the additional mouthpiece 16 is fed to the line along which the implementation is carried out. 1 cuts and performs its heating in advance.

If it is necessary to change the length and power of the flame, the main mouthpiece 2 is screwed into the cutter body 1, while adjusting the dynamic resistance to flow and the flow rate of the mixture. At the same time, the quality of the preparation of the mixing of oxygen and combustible gas changes in 1 of the burnt mixture, which makes it possible to obtain torches with the required properties (length and power) and to cut the blanks at a higher speed. In addition, the presence of the net makes it possible to completely eliminate the kickback.

Claims (1)

Invention Formula A gas-oxygen cutter comprising a housing, a main and additional channels with injectors for supplying fuel gas to the mixing chamber of the main mouthpiece and an additional flow control device, respectively, in order to improve the quality of the mixture preparation, the cutter is provided with a cigar-shaped needle installed in the main channel and mesh placed in the mixing chamber. turned 1