RU2000021C1 - Cutter for oxygenic cutting of metal - Google Patents

Abstract

SUMMARY OF THE INVENTION: The cutter includes a mouthpiece formed by interconnecting a stepped confuser 1 and a diffuser 4. A transverse gap is made between them and extends to the periphery of the annular gap. The central channel 2 of the variable mouthpiece serves to supply cutting oxygen. The annular cavity 5 located concentrically to the channel is connected to the central channel by openings 6. The sleeve 3 is fixed to the mouthpiece and forms an annular channel with it for the passage of the heating mixture. The openings 6 for connecting the central channel 2 with the annular cavity 5 are made through, staggered and located in the cross section of the confuser 1 at the transition channel 2 to its last stage. 2 ill.

Description

The invention relates to oxygen cutting of metal.

The purpose of the invention is to simplify the cutting device and increase its productivity and cut quality.

In FIG. 1 shows a cutter, a longitudinal section; in FIG. 2 is a section AA in FIG. 1.

The cutting torch for oxygen cutting of metal consists of a mouthpiece formed by interconnecting a stepped confuser 1 and a diffuser 4, between which there is a transverse slit widening from the periphery. The central channel 2 of the variable mouthpiece serves to supply cutting oxygen.

The annular cavity 5 is located around the confuser 1 concentrically to the channel and is connected to the last through holes 6, which have a stepped shape and are located in the cross section of the confuser

1 about the place of transition of the channel to its last stage and, in addition, is associated with a transverse slot in the place of its largest section

The sleeve 3 is attached to the mouthpiece and forms with it an annular channel for the passage of the heating mixture.

Cutter for oxygen cutting of metal works as follows.

A combustible mixture enters the annular channel, which feeds the heating flame. A stream of cutting oxygen is fed into the central channel 2 of the mouthpiece. Before the last stage of the central channel 2 of the confuser 1, part of the oxygen is led through stepwise through holes b to the annular cavity. Since from space 6 they are located tangentially to the central channel 2, and a gas rotary ring is formed in the annular cavity 5

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The direction of rotation of the ring (clockwise or counterclockwise) is provided by the mutual arrangement of the holes 6. If their position is reversed relative to the original one, for example, shown in the drawing, the direction of rotation of the gas ring in the annular cavity 5 will be reversed. In some cases, this is of fundamental importance. It is known that in the process of metal combustion, slags (grats) are formed which are blown out from the gas jet treatment zone and contaminate the surface to be treated. When cutting a metal with a swirling jet, depending on the direction of rotation of the gas jet, the resulting slag is thrown into one or another

side of the cut line, i.e. this protects the slag (burr) from cutting the part.

From the annular cavity 5, rotational oxygen flows through the annular gap between the confuser 1 and the diffuser 4 tangentially to the main flow of cutting oxygen and again enters the central channel 2.

By twisting the gas stream already densified as much as possible by confuser 1, enveloping it evenly around the entire perimeter, the rotating gas ring, without destroying the formed stream, further compacts and contributes to its 5 energy indicators (compactness and range). As a result, the speed and quality of the cut is improved.

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Claims (1)

SUMMARY OF THE INVENTION An oxy-fuel cutting torch for a metal, comprising a mouthpiece with a central channel of variable cross-section for supplying oxygen, a concentric annular cavity located concentrically with the holes, and a sleeve fixed to the mouthpiece and forming an annular channel for passage of the heating mixture characterized in that the mouthpiece is made of connected between each other a step confuser and a diffuser, between which there is a transverse slit widening to the periphery, while the holes for communicating the central channel with the annular cavity are made through, stepped and are located in the cross section of the confuser at the channel transition point to its last stage, and the annular cavity is located around the confuser and is associated with the transverse gap in the place of its largest section. 1 Figl FIG. 2.