KR102526125B1 - Nozzle cover, gas cutting crater and gas cutting torch - Google Patents

Abstract

A nozzle cover having improved heat dissipation by increasing the surface area of an outer circumferential surface, a gas cutting crater using the nozzle cover, and a gas cutting torch are provided.
The cover A has a hole 1 into which a nozzle 10 for ejecting cutting oxygen is inserted, and has a concave-convex portion 5 made of a plurality of concavities and convexities on its outer circumferential surface. The crater B is configured by inserting a nozzle 10 having a centrally disposed oxygen spraying hole and a preheating gas spraying groove disposed around the cut oxygen spraying hole into a hole 1 formed inside the cover A. do. The torch (C) has a cover (A) having a male screw part (7) disposed at the end of the outer circumferential surface, and the cover (A) is configured by fastening the female screw part (24) disposed at the end of the torch body (20). do.

Description

Nozzle cover, gas cutting crater and gas cutting torch}

The present invention relates to a nozzle cover having improved heat dissipation by increasing the surface area of the outer circumferential surface, a gas cutting crater using the nozzle cover, and a gas cutting torch.

Gas cutting preheats a material to be cut, such as a steel plate, by spraying preheating salt obtained by burning a mixture of fuel gas and preheating oxygen from a gas cutting crater, and spraying cutting oxygen to the sufficiently preheated material to be cut to burn the base material while spraying energy. This is achieved by removing the molten parent material or oxidation product by And it is possible to cut the material to be cut into a desired shape by moving the gas cutting crater in a desired direction while continuing gas cutting.

The fuel gas includes acetylene gas, liquefied petroleum gas, natural gas, ethylene gas, hydrogen gas, and the like, and gas cutting craters corresponding to each fuel gas are provided. For example, a gas cutting crater using acetylene gas as a fuel gas is configured by disposing a cutting oxygen injection hole formed in the center and a preheating gas injection hole formed around the cutting oxygen injection hole in one material.

A gas cutting crater using a gas selected from liquefied petroleum gas, natural gas, ethylene gas, and hydrogen gas as a fuel gas includes a nozzle and a nozzle having a cutting oxygen injection hole formed in the center and a slit for passing preheating gas on the outer circumference. It consists of an insert cover. In such a gas cutting crater, when a nozzle is inserted into a cover, a space is formed between the inner circumferential surface of the cover and the outer circumferential surface of the nozzle, and preheating gas in which fuel gas and preheating oxygen are mixed is injected from the slit through this space.

In particular, when piercing, which is a drilling process for a material to be cut, is performed using a gas cutting crater, during the time until the hole penetrates, spatter made of a molten base material or an oxidation product is ejected toward the gas cutting crater, and the temperature There is a problem that is attached to the raised gas cutting crater. In order to prevent the adhesion of this spatter, it is common to carry out piercing while keeping the height of the gas cutting crater from the material to be cut several times higher than the height at the time of gas cutting.

When piercing a steel plate using a gas cutting crater, the gas cutting crater is made to be spaced upward from the material to be cut, but in this case, the preheating efficiency of the material to be cut by preheating flame is lowered, There is a problem that the time required for piercing is taken as the preheating time increases.

In addition, since the gas cutting crater is maintained at a position higher than the height of the material to be cut during general cutting, it is necessary to bring the gas cutting crater close to the steel plate after the piercing is finished. When this operation is performed simply by bringing the gas cutting crater close to the material to be cut, the temperature of the base material around the hole decreases, making continuous gas cutting impossible. For this reason, when moving the gas cutting crater from the height at the time of piercing to the height at the time of gas cutting, it is necessary to keep the gas cutting to the material to be cut by driving the gas cutting crater. Therefore, excessive cutting is performed on the material to be cut, resulting in a problem that the yield is lowered.

An object of the present invention is to provide a nozzle cover having improved heat dissipation by increasing the surface area of the outer circumferential surface, a gas cutting crater using the nozzle cover, and a gas cutting torch.

In order to solve the above problems, a typical nozzle cover according to the present invention is a nozzle cover having a hole into which a nozzle for ejecting cut oxygen is inserted, and has a plurality of irregularities on the outer circumferential surface.

In addition, the gas cutting crater according to the present invention is configured by inserting a nozzle having a cutting oxygen spraying hole disposed at the center and a preheating gas spraying groove disposed around the cutting oxygen spraying hole into a hole formed inside the nozzle cover.

In addition, the gas cutting torch according to the present invention has the nozzle cover having a male screw portion disposed at the other end of the outer circumferential surface, and the nozzle cover is configured by fastening the female screw portion disposed at the end of the torch body.

The nozzle cover according to the present invention (hereinafter, simply referred to as "cover") has a concavo-convex portion made of a plurality of concavo-convex portions on the outer circumferential surface, so that the surface area of the outer circumferential surface can be increased. Therefore, the heat dissipation area can be increased and the temperature rise at the time of gas cutting can be reduced.

As a result, spatter adhesion during piercing is reduced, and preheating and piercing can be performed in a state closer to the material to be cut than before. For this reason, the cover can be kept cleaner than before while achieving a reduction in preheating time.

In addition, the gas cutting crater according to the present invention (hereinafter simply referred to as "crater") is preheated by the inner circumferential surface of the cover and the outer circumferential surface of the nozzle when a nozzle having a cutting oxygen spraying hole and a preheating gas spraying groove is inserted into the cover. A space leading to the gas injection groove is formed. Because of this, not only the rise in temperature due to the increase in the heat dissipation area of the cover is reduced, but also it is cooled by the preheating gas flowing through the space during gas cutting, so that the rise in temperature can be further reduced.

Further, a gas cutting torch according to the present invention (hereinafter simply referred to as "torch") is configured by fastening a cover having a male threaded portion at an end portion to a female threaded portion formed at an end portion of a torch body. For this reason, since the cover can be sufficiently thick and the surface area of the outer circumferential surface can be increased, the temperature rise can be further reduced.

1 is a diagram explaining the configuration of a cover.
2 is a cross-sectional view explaining the configuration of the cover.
3 is a development view explaining the configuration of a crater in which a cover and a nozzle are assembled.
4 is a view explaining the configuration of a torch in which a cover and a torch body are assembled.
5 is a view explaining a state in which a torch, a cover, and a nozzle are assembled.
6 is a diagram illustrating another example of a cover.

Hereinafter, a cover according to the present invention, a crater using the cover, and a torch using the cover will be described. The cover according to the present invention has a concavo-convex portion made of a plurality of concavo-convex portions on the outer circumferential surface, so that the surface area of the outer circumferential surface is increased. In addition, a hole for inserting a nozzle for spraying cutting oxygen is formed inside, and it is possible to function as a crater by inserting a nozzle into the hole. In addition, by having a male screw portion screwed into the female screw of the torch body at the end, it becomes possible to configure the torch by functioning as a nut for attaching the nozzle to the torch body.

The size of the cover is not limited, and the same shape and dimensions as the crater cover of the cutting crater using liquefied petroleum gas (LPG), natural gas, ethylene gas, hydrogen gas, etc. (hereinafter, representatively referred to as "LPG") as fuel gas It doesn't matter. However, in order to realize more effective heat dissipation, it is preferable that the length is the same as that of the crater cover and the outer diameter is sufficiently larger than that of the crater cover.

The shape of the concavo-convex portion formed on the outer circumferential surface of the cover is not limited. For example, it is possible to form the concave-convex portion by alternately forming a plurality of grooves and a plurality of protrusions in the longitudinal direction of the cover, and also in the circumferential direction of the outer circumference. A plurality of grooves and a plurality of protrusions may be alternately formed and constituted. These irregularities can be formed by cutting grooves by machining, or can also be formed by rolling.

Therefore, the cross-sectional shape of the concavo-convex has a shape selected from shapes such as a triangular shape made of continuous straight lines, a rectangular shape, a trapezoidal shape, a trapezoidal shape, or a waveform shape made of continuous curves. In this way, by forming a plurality of irregularities on the cover, the area of the outer circumferential surface increases, and as a result, the heat dissipation area increases, making it possible to reduce the temperature rise of the cover.

In order to smoothly perform the operation of checking the preheating flame or checking the air flow of the injected cutting oxygen during the gas cutting operation, the end of the cover that ejects the cutting oxygen (hereinafter referred to as the “front end”) side is toward the front. It is preferable to be formed into a thin shape. Accordingly, the cover has a tapered portion formed on the front end side, and a concavo-convex portion is formed on the side of the other end (hereinafter referred to as "torch body side end") in succession to the tapered portion.

By forming a tapered portion with a tapered front at the front end of the cover, the concavo-convex portion having a groove formed in the longitudinal direction of the concave-convex portion is opened to the tapered portion at the distal end side of the groove. Further, the groove constituting the concavo-convex portion does not necessarily have to be open to the distal end side, and may be connected to the tapered portion via a partition wall.

When the groove constituting the concavo-convex portion is open in the tapered portion, processing for forming the concavo-convex portion is easy. In addition, when the groove is connected to the tapered portion through the partition wall, even when spatter or slag is ejected during the piercing operation, the possibility of them adhering to the groove is reduced.

Hereinafter, the cover A according to this embodiment will be described with reference to FIGS. 1 and 2 . The cover A according to this embodiment has an outer diameter sufficiently larger than the outer diameter of a crater cover (not shown) generally used for gas cutting. And, it is possible to exhibit a function as a fireball (B) by engaging with a nozzle, and it is possible to exhibit a function as a torch (C) by engaging with a torch body.

As shown in FIGS. 1 and 2 , inside the cover A, there is a hole 1 for inserting a nozzle (see FIG. 3 ) for ejecting cutting oxygen and a flow path for preheating gas following the hole 1. A distribution hole 2 is formed.

On the outer circumferential surface of the cover A, an uneven portion 5 composed of a plurality of rectangular grooves 5a and a plurality of protrusions 5b is formed. The number and width of the grooves 5a are not particularly limited, and are preferably set appropriately according to the specifications of the nozzle to be coupled.

In addition, a tapered portion 6 having a tapered front that decreases in diameter toward the tip portion is formed on the front end side of the cover A, and the taper portion 6 continues with the concave-convex portion 5. The taper angle of the tapered portion 6 is not particularly limited, and is preferably set appropriately in correspondence with the outer diameter of the concave-convex portion 5 or the outer diameter of the tip portion.

In this embodiment, the end of each groove 5a on the tapered portion 6 side is open to the taper portion 6.

At the end of the cover A on the opposite side to the tapered portion 6, a male thread portion 7 composed of a male thread 7a and an undercut 7b screwed into a female thread 24 formed in the torch body 20 to be described later is provided. is formed In addition, the end face 8 of the male screw portion 7 comes into contact with the end face 12f of the distribution member 12 constituting the spindle 11 of the nozzle 10 when forming the crater B described later, so that the corresponding nozzle ( 10) to the torch body 20.

At the end of the male threaded portion 7 of the concave-convex portion 5, two chamfered portions 9 formed in parallel at a site spaced apart from the male threaded portion 7 are formed, and the two chamfered portions 9 The cover (A) can be fastened to the torch body by hooking a spanner on.

In the cover A configured as described above, the surface area of the side wall portion composed of the groove 5a and the protrusion 5b of the concave-convex portion 5 is increased. In addition, as the surface area of the cover A is increased, an area receiving radiant heat from preheating flame or radiant heat from molten base material and oxidation products during gas cutting is also increased. However, it is mainly the surface of the tapered portion 6 that is greatly affected by radiant heat, and the surface of the concave-convex portion 5 can function as a heat dissipation surface to improve the heat dissipation effect.

As the surface area of the uneven portion 5 of the cover A increases, the heat dissipation effect is improved, and as a result, the temperature of the cover A can be reduced. For this reason, even if spatter generated by gas cutting to the material to be cut or piercing to the material to be cut adheres to the cover A, the possibility that the spatter is firmly fused is reduced.

In addition, the thickness of the cover A can be increased by making the outer diameter of the cover A larger than the outer diameter of the crater cover constituting a general gas cutting crater. As a result, the heat capacity of the cover A increases, so that the temperature rise due to radiant heat can be further reduced.

Next, the configuration of the crater B using the cover A according to the present embodiment will be described with reference to FIG. 3 . The crater B is constituted by assembling a cover A and a nozzle 10 inserted into a hole 1 of the cover A.

The nozzle 10 is composed of a spindle 11 and a distribution member 12, and is integrated by fastening the spindle 11 to the distribution member 12. Then, the front end 11a of the spindle 11 is inserted into the hole 1 formed inside the cover A, and the cover A and the nozzle 10 form the crater B.

In the spindle 11, a cutting oxygen ejection hole (not shown) is disposed in the center, and a plurality of slits 11b serving as ejection grooves for preheating gas composed of a mixed gas of fuel gas and preheated oxygen are provided on the tip 11a side of the outer circumferential surface. is formed In addition, a male screw is formed at the rear end 11c of the spindle 11, and is fastened to the distribution member 12 through the male screw.

The cutting oxygen ejection hole formed in the spindle 11 has a diameter set corresponding to the thickness of the material to be cut. Further, the width, depth and number of slits 11b are set in accordance with conditions such as the thickness of the material to be cut, the surface properties of the material to be cut, or the type of fuel gas.

The distribution member 12 has a distribution portion 12a formed in a tapered shape having a preset angle, and sheets 12b, 12c, and 12d are formed in the distribution portion 12a. A hole through which cutting oxygen is supplied is formed in the center of the distribution member 12 in the longitudinal direction (direction of the central axis), and the spindle 11 is inserted at the tip side (12e, right end side in FIG. 3) of the hole. A female screw to fasten is formed.

A plurality of holes through which preheating oxygen is supplied are formed between the seats 12b and 12c, and a plurality of holes through which fuel gas is supplied are also formed between the seats 12c and 12d. In addition, a gas mixing section in which a hole through which preheating oxygen is supplied and a hole through which fuel gas is supplied intersect is formed inside the distribution member 12, and the supplied preheated oxygen and fuel gas become a mixed gas in the gas mixing section, It is ejected from the end face of the distal end side 12e and is supplied to the outer circumferential surface of the spindle 11.

The end face 12f of the spindle 11 side of the distribution part 12a is in contact with the end face 8 of the cover A, and the male screw 7 of the cover A is connected to the female screw 24 of the torch body 20. It becomes the surface on which the pressing force acts when tightening.

In the crater B configured by inserting the nozzle 10 into the hole 1 of the cover A, as shown in FIG. 5, the mixed gas flow path between the inner circumferential surface of the cover A and the outer circumferential surface of the spindle 11 (13) is composed. Therefore, while performing gas cutting of the material to be cut by the crater B, the cover A is cooled by the mixed gas flowing through the flow path 13 . For this reason, as the heat dissipation area of the concave-convex portion 5 formed on the outer circumferential surface of the cover A increases, cooling can be performed with good efficiency, thereby reducing the temperature rise of the crater B.

In addition, in the above-described embodiment, the nozzle 10 is configured in a chip mixing method in which preheated oxygen and fuel gas are mixed with the distribution member 12, but a method in which a flow path through which the mixed gas flows is formed between the cover and the nozzle Of the cooking zones, for example, even a torch mixing cooking zone can be used.

Next, the configuration of the torch (C) using the cover (A) according to the present embodiment will be described according to FIG. The torch (C) is configured by assembling the cover (A) and the torch body (20).

The torch body 20 can use a generally used medium pressure torch as it is. That is, the head 21 is disposed at one end of the torch body 20, and the distribution member 22 is disposed at the other end. The head 21 and the distribution member 22 are connected via a cut oxygen pipe 23, a preheating oxygen pipe (not shown), and fuel gas.

When the head 21 is mounted on the nozzle 10 through the cover A, cutting oxygen, preheating oxygen, and fuel gas are independently supplied to the nozzle 10. Therefore, a female screw 24 is formed at the end of the head 21 of the torch body 20. And it is configured to fasten or separate the male screw 7 formed in the cover (A).

On the inner surface of the head 21, sheets 25a, 25b and 25c are formed with the same taper as the dispensing portion 12a of the distributing member 12 formed in the nozzle 10. A groove 26a is formed between the sheets 25a and 25b, and a groove 26b is formed between the sheets 25b and 25c. In addition, a hole 27 is formed in the center of the head 21, and the hole 27 is open to the sheet 25a. The cut oxygen pipe 23 is connected to the hole 27, the preheating oxygen pipe is connected to the groove 26a, and the fuel gas pipe is connected to the groove 26b.

A cutting oxygen passage, a preheating oxygen passage, and a fuel gas passage (not shown) are independently formed in the distribution member 22, and a needle valve 28 is disposed in each passage. And it is comprised so that the flow rate of each gas can be adjusted by individually opening and closing each needle valve.

The torch (C) configured as described above is composed of a combination of the cover (A) and the torch body 20, and the specifications of the nozzle 10 are not limited. For example, a nozzle for gas cutting a thin plate, a nozzle with a small diameter cutting oxygen outlet, or a nozzle for gas cutting a thick plate, a nozzle with a large cutting oxygen outlet, etc. It is possible to select and use a nozzle 10 having a cut oxygen ejection hole having an optimal diameter corresponding to the thickness of the material.

And, as shown in FIG. 5, the nozzle 10 is inserted into the hole 1 of the cover A to configure the crater B, and the male screw 7 of the cover A is screwed into the female screw of the head 21. By fastening to (24), the crater (B) can be mounted on the torch body (20). At this time, the sheet 12b of the distribution member 12 of the nozzle 10 is press-contacted with the sheet 25a formed on the head 21 of the torch body 20, and the sheet 12c is pressed against the sheet 25b. It is press-contacted, and the seat 12d is press-contacted with the seat 25c, so that the supplied gas can be prevented from leaking.

Therefore, by opening and closing the needle valve 28 of the distribution member 22 provided in the torch body 20, it is possible to supply preheated oxygen and fuel gas to the crater B and blow them out as a mixed gas. Then, it is possible to ignite the ejected mixed gas to form preheating flame, and preheat the material to be cut by the preheating flame. After the material to be cut is sufficiently preheated, piercing and cutting of the material to be cut can be performed by supplying cutting oxygen and ejecting it from the cutting oxygen ejection hole of the crater B.

While preheating the material to be cut, radiant heat by preheating flame acts on the cover A. In addition, while cutting the material to be cut, radiant heat by preheating flame and radiant heat by melting oxide act on the cover A, and there is a possibility that sputtered spatter may adhere to it. However, the mixed gas flowing through the passage 13 formed between the cover A and the spindle 11 of the nozzle 10 exerts a cooling action on the cover A, thereby reducing the temperature rise of the cover A. there is. For this reason, it becomes possible to reduce the adhesion of spatter to the cover A.

Therefore, when performing piercing on the material to be cut, it becomes possible to bring the cover A closer, and it is possible to shorten the preheating time.

The present inventors set the length to the same dimensions as the cap of a conventional crater using LPG as fuel gas, the outer diameter of the uneven portion 5 is about 30 mm, the width is about 2 mm, and the groove 5a is about 2 mm in depth. A piercing experiment was conducted by manufacturing a cover (A) in which 24 were formed. In the experiment, the preheating time was measured at a height at which the adhesion of the spatter to the cover A when pierced was almost the same as that of the conventional gas cutting crater.

When the thickness of the material to be cut is 70 mm, preheating is performed by setting the height to about 50 mm in the conventional gas cutting crater, and the preheating time until the piercing starts is about 60 seconds. In the case of using the above-described cover, it became possible to approach the height to 6 to 10 mm, and the preheating time was 20 to 30 seconds. At this time, the attachment of the spatter to the cover A is almost similar to the attachment of the spatter to the conventional gas cutting crater.

Next, another example of the cover A will be described according to FIG. 6 . In the drawings, the same reference numerals are given to the same parts and parts having the same functions as those of the above-described embodiment, and descriptions thereof are omitted.

As shown in the figure, the concavo-convex portion 5 and the tapered portion 6 are connected via a partition wall 30. That is, at the end of the groove 5a constituting the concave-convex portion 5 on the side of the tapered portion 6, a raised portion 5c open to the outer circumferential surface constituting the concave-convex portion 5 is formed, and the raised portion ( 5c) and the tapered portion 6 are constituted by partition walls 30.

Therefore, the groove 5a of the concavo-convex portion 5 is not opened to the taper portion 6 but blocked by the partition wall 30. For this reason, the concavo-convex portion 5 is protected from radiant heat at the time of preheating or cutting the material to be cut by the partition wall 30, and it is possible to further improve heat dissipation. In addition, spatter scattered during piercing can be blocked by the barrier rib 30, so that spatter attached to the concave-convex portion 5 can be reduced.

For this reason, it becomes possible to keep the cover A in a cleaner state than before, and it becomes possible to contribute to maintenance of cutting performance and extension of life.

The cover (A) according to the present invention can be used not only for nozzles of a chip mixing method but also for nozzles of a torch mixing method.

A cover
B Crater
C torch
1 hole
2 distribution holes
5 uneven part
5a home
5b overhang
5c rise
6 taper part
7 male thread
7a male thread
7b undercut
8 section
9 2 chamfers
10 nozzle
11 spindle
11a tip
11b slit
11c rear end
12 distribution member
12a distribution section
12b to 12d sheets
12e tip side
12f section
13 distribution route
20 torch body
21 heads
22 distribution member
23 Cutting Oxygen Tubing
24 female thread
25a to 25c seat
26a, 26b home
27 holes
28 needle valve
30 bulkhead

Claims (5)

A nozzle cover having a hole for inserting a nozzle for ejecting cutting oxygen therein,
outer surface,
A taper portion whose diameter decreases toward the end side for ejecting cutting oxygen from a nozzle inserted into a hole formed therein, and
Has a concave-convex portion made of a plurality of concavities and convexities disposed on the other end side of the tapered portion;
A nozzle cover, characterized in that the plurality of concavo-convex portions disposed on the concave-convex portion are connected to the tapered portion through a partition wall. delete delete A gas cutting crater characterized in that a nozzle having a cutting oxygen spraying hole arranged at the center and a preheating gas spraying groove arranged around the cutting oxygen spraying hole is inserted into the hole formed inside the nozzle cover according to claim 1. It has a nozzle cover according to claim 1 having a male screw portion disposed on the other end of the outer peripheral surface,
Gas cutting torch, characterized in that configured by fastening the nozzle cover to the female screw portion disposed at the end of the torch body.

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