JPH018836Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial Application Field" This invention relates to a high-pressure, high-speed cutting nozzle suitable for gas cutting of thick steel plates of approximately 100 to 500 mm.

"Prior Art" Prior to the invention of the present invention, the inventors of the present invention
We proposed a high-pressure, high-speed cutting crater with the structure shown in b (Utility Model Application No. 169134/1983). What is indicated by the reference numeral 1 in the figure is a cut oxygen hole. The internal shape of the cut oxygen hole 1 is a divergent shape with the oxygen jetting tip opened at an appropriate angle, and the inner surface has a smooth precision finish. A first annular recess 2 is provided around the opening 1a of the cut oxygen hole 1 with a protrusion 1b in between, and the bottom of the first recess 2 has a first preheating gas hole 2a and a small annular opening. The first hole has holes arranged in an annular manner.
A preheating oxygen hole 2b is provided adjacently. The outer edge tip 2c of the first recess is the protrusion 1 around the oxygen hole 1.
b, and from the tip 2c of this outer edge, the bottom of a second recess 3 having a predetermined width is provided in an annular shape in a direction substantially perpendicular to the outer edge. A section 3a is provided.
At the bottom of the second recess 3, there are provided a second preheating gas hole 3b consisting of annularly arranged small holes, and a second annular preheating oxygen hole 3c adjacent to the outer periphery of the second preheating gas hole 3b.

This high-pressure, high-speed cutting nozzle is formed by three blocks, A and C, which are indicated by diagonal lines in Figure 1a. This is what I did. And between A, Robrock and B, Hublock, there is a spacer 4 as appropriate...
Annular holes 3c and 2a are formed by providing annular holes 3c and 2a.
Further, the small holes 3b and 2b in which the small holes are arranged in an annular manner are bored in the rob lock.

According to the above configuration, high-pressure cutting oxygen is ejected from the divergent-shaped cutting oxygen hole 1 at an extremely high speed. At this time, the outer periphery of the ejected flow is a heating flame formed by forcibly mixing the preheated gas and preheated oxygen ejected from the first preheated gas hole 2a and the first preheated oxygen hole 2b in the first recess 2 outside the tip of the respective crater. burns as. If this is called the heating flame group A, the outer periphery of the heating flame group A is such that the preheating gas and preheating oxygen ejected from the second preheating gas hole 3b and the second preheating oxygen hole 3c are in the second recess 3 outside the tip of the respective crater. , surrounded by group B of heated flames that undergo forced mixed combustion.

"Problems to be Solved by the Invention" By the way, the present inventors subsequently put the above-mentioned conventional product into practical use and conducted various studies, and found that there were the following problems to be solved.

That is, in the case of the above-mentioned conventional product, each gas and each oxygen to form a heating flame are supplied to the first and second recesses 2 and 3 of the crater, and are forcibly mixed and combusted. Due to the heating effect, the protruding outer edge 3a of the second recess 3 at the crater opening is heated, and the outer peripheral tip 2c of the first recess 2 is also heated. Therefore, over time, the outer edge 3a and the outer peripheral tip 2c become overheated, and the crater itself is also abnormally heated due to heat conduction, making the flame apt to become unstable.

This idea was made in view of the above circumstances,
To provide a high-pressure, high-speed cutting nozzle that can obtain a stable flame over a long period of time without blowing out the flame or overheating the nozzle even when a relatively large amount of preheated gas and preheated oxygen flows through the nozzle. The purpose is to

"Means for Solving the Problem" This invention is such that the bottoms of the first recess and the second recess are located on almost the same horizontal plane, and the tip of the cut oxygen hole and the side walls of the first recess and the second recess are located on the same horizontal plane. It is characterized by being configured so that the tips are located on the same horizontal plane.

"Operation" According to the above configuration, the first
The recessed portion and the second recessed portion constituting heating flame group B are left as they are.

Generally, the jet flow of oxygen ejected from the cutting oxygen hole, which affects the cutting effect, is influenced by the heating power and length of the heating flame surrounding it.
In this invention, heating flame B is further placed around heating flame group A.
The presence of groups further enhances this effect.
That is, the combustion speed of the heating flame group A is increased by the heating flame group B, so that even if a relatively large amount of fuel gas and preheated oxygen are passed through, the flame will not blow out, the heating power will be high, and the flame will be long. , which can promote the elongation of the cutting oxygen jet flow and increase the cutting effect. Furthermore, since the first recess and the second recess are located on the same horizontal plane, the crater opening is not heated more than necessary, and the flame does not become unstable.

This invention will be explained in detail below using examples.

``Embodiment'' FIG. 1 shows an embodiment of this invention, and parts in common with those in FIG. 2a are given the same reference numerals to simplify the explanation. In the figure, reference numeral 10 indicates the first recess forming the heating flame group A, and reference numeral 11 indicates the first recess forming the heating flame group A.
indicates the second recess forming the heating flame group B. These first recesses 10 and second recesses 1
Both open ends of the cut oxygen hole 1 are located on the same horizontal plane as the open end of the cut oxygen hole 1, and are located on the same horizontal plane as the open end of the cut oxygen hole 1.
The bottoms of the recesses 11 are located on the same horizontal plane parallel to the opening end. As in the conventional case, a first preheating gas hole 2a and a first preheating oxygen hole 2b are opened in the first recess 10, and a first preheating gas hole 2a and a first preheating oxygen hole 2b are opened in the first recess 10.
1 has a second preheating gas hole 3b and a second preheating oxygen hole 3c open therein.

According to the above configuration, the first recess 10 and the second recess 11 are annular recesses drawn inward from the tip of the crater, so that these first recesses 10
The heating flames A group and B group formed by the second recess 11 interact with each other, and the A group is not blown out after being ignited due to the influence of the B group. In addition, since the first recess 10 and the second recess 11 are located on the same horizontal plane, the crater opening is not heated more than necessary, and as a result,
It is possible to obtain a stable flame over a long period of time without causing the crater to become overheated over time.

In the above embodiment, the first preheating gas hole and the second preheating oxygen hole were formed by providing spacers between the blocks C and B and between the blocks C and B, but spacers were formed on the outer peripheral surface of each block or between the blocks C and B. The grooves may be formed by providing cut grooves parallel to the longitudinal direction on the inner circumferential surface and closely fitting each block. According to this configuration, the shape of the cut groove can be easily changed into various shapes, thereby making it possible to easily form gas holes or oxygen holes with various cross-sectional shapes. Alternatively, the blocks may not be integrated, but may be divided as appropriate and integrated by fitting these parts together. With this configuration, both the first preheated oxygen hole and the second preheated gas hole formed in the block can be easily obtained by forming the cut grooves as described above.

"Effect of the invention" As explained above, the high-pressure, high-speed cutting nozzle according to this invention can perform stable and powerful combustion without flame blowout even when the flow rates of fuel gas and preheated oxygen are increased. , the heating power is strong, and the heating flame is also extended, which promotes the effect of the cutting oxygen jet flow and enhances the cutting effect. Furthermore, since the crater does not become overheated over time, a stable flame can be obtained over a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing an embodiment of this invention.
Figures 2a and 2b show a conventional high-pressure, high-speed cutting nozzle, where a is a side sectional view and b is a bottom view of the opening. DESCRIPTION OF SYMBOLS 1... Cutting oxygen hole, 2a... First preheating gas hole, 2b... First preheating oxygen hole, 3b... Second preheating gas hole, 3c... Second preheating oxygen hole, 10...
...first recess, 11...second recess.

Claims (1)

[Scope of utility model registration request] A divergent-shaped cut oxygen hole provided in the center, an annular first recess that surrounds the cut oxygen hole and whose outer edge is in the same horizontal plane as the tip of the cut oxygen hole, and an annular first recess that opens at the bottom of the first recess. The annular first preheating gas hole and the first preheating oxygen hole formed in A high-pressure, high-speed cutting crater comprising a second recess having a substantially horizontal annular bottom, and a second preheating gas hole and a second preheating oxygen hole arranged in an annular manner so as to open at the bottom of the second recess. .