RU2798136C1 - Device and method for manufacturing radiant tubes - Google Patents

Abstract

FIELD: heating devices.

SUBSTANCE: invention is related to a radiant tube device located in a heat treatment unit for performing heat treatment of a strip, and to a method for manufacturing the same. The radiant tube device contains a tube having an internal channel, the tube having a first continuous groove and a second continuous groove passing on the surface next to each other and spaced from each other at a predetermined distance, and in each continuous grove, both the first and second, separate grooves at a given height from the specified surface, are connected to each other in the longitudinal direction.

EFFECT: increase in the surface area of radiation heat radiation.

12 cl, 12 dwg

Description

FIELD OF THE INVENTION

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application claims priority under Korean Patent Application No. 10-2019-0169104 filed December 17, 2019 with the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

The present invention relates to a radiant tube device located in a heat treatment plant for a material to be heat treated, and to a method for manufacturing the same.

BACKGROUND OF THE INVENTION

Metal materials processed in various ways, such as casting, forging, rolling and extrusion, are heat treated at a certain temperature to achieve the desired strength and crystal size, or passed through a heat treatment furnace maintained at a certain temperature for surface treatment.

During heat treatment, metallic materials such as strips and plates can be oxidized by the oxygen present in the annealing furnace. To prevent the formation of oxides, heat treatment is used in an inert atmosphere, such as nitrogen or argon, or in a vacuum state. When heat treatment in an inert atmosphere or in a vacuum is required, an electrically powered heating element is sometimes used as a heat source, but for inexpensive heat treatment of mass products, the use of heat generated by burning gas with a burner is suitable. In this case, since the burner cannot be directly ignited in an inert atmosphere without oxygen to burn the gas, a radiant tube provided with a burner is used.

Even in a normal atmosphere, not an inert atmosphere, if the flame is directly sprayed, the strip may be heated unevenly and become discolored, so the flame generated by the burner is circulated in the radiant tube to heat the radiant tube, and the strip is indirectly heated by radiant heat emitted from the heated radiant tube. The radiant tube can be made by casting a tubular shape using casting, or by forming a plate material into a tubular shape and welding a curved tube and a straight tube to each other.

However, an attempt has been made to improve the thermal efficiency of the radiant tube by forming a protrusion of the negative electrode on the surface using centrifugal casting or by embossing polygons on the surface of the radiant tube.

However, since the height of the protrusion of the negative electrode cannot exceed the thickness of the surface of the radiant tube, there is a limit to the improvement in thermal efficiency. In addition, the polygon forming the specified relief is located so that one of its sides coincides with the side of the adjacent polygon, which limits the shape that can be made, and intermittent relief formation reduces the production capacity of a continuous relief that can be made per unit time. In addition, when one pattern forming a continuous pattern comes into contact with another pattern, the radiative heat radiating surface area decreases as much as the contact area decreases, so the increase in thermal efficiency is also limited, which is a problem.

SUMMARY OF THE INVENTION

TECHNICAL PURPOSE

The purpose of this invention is to provide a radiant tube device in which continuous reliefs, made parallel to other reliefs at a given distance from them, are applied to the surface of the radiant tube to increase the surface area of radiation heat radiation, and to provide a method for manufacturing such a device.

TECHNICAL SOLUTION

A radiant tube apparatus according to one aspect of the present invention comprises a tube having an internal channel, the tube having a first continuous pattern and a second continuous pattern extending side by side on a surface and spaced apart from each other by a predetermined distance, wherein in each continuous pattern, the first and second, single reliefs having a given height from the specified surface are connected to each other in the longitudinal direction.

The pipe may comprise straight flow sections extending in a straight line and a curved flow section connected to the ends of the straight flow sections such that the straight flow sections are parallel.

In the first continuous pattern, the first unit patterns containing the hypotenuse or the vertical side of the right triangle may be connected to each other to form a zigzag shape, and in the second continuous pattern, the second unit patterns formed by straight lines may be connected to each other to form a straight line. .

In the first continuous pattern, the first unit patterns having two sides with a predetermined included angle may be connected in the longitudinal direction to form a sawtooth shape, and in the second continuous pattern, the second unit patterns formed in a straight line may be connected to each other to form straight line.

In each continuous pattern, the first and second, the unit patterns containing the hypotenuse or the vertical side of the right triangle can be connected to each other in the longitudinal direction to form a zigzag shape, while the centers of the unit patterns forming the second continuous pattern can be shifted in parallel by a given distance in the longitudinal direction from the centers of the single reliefs forming the first continuous relief.

In each continuous pattern, first and second, unit patterns having two sides with a given included angle can be connected in the longitudinal direction to form a sawtooth shape, while the centers of the unit patterns forming the second continuous pattern can be shifted in parallel by a given distance in longitudinal direction from the centers of single reliefs forming the first continuous relief.

In the first continuous pattern, the first unit patterns having three sides connected vertically on the inside and one side connected vertically on the outside can be connected in the longitudinal direction to form a concave-convex shape, and in the second continuous pattern, the second unit patterns reliefs formed from straight lines can be connected in the longitudinal direction to form a straight line.

In each continuous relief, first and second, unit reliefs containing three vertically connected sides on the inside and one side vertically connected on the outside can be connected in the longitudinal direction to form a concave-convex shape.

In the first continuous pattern, the first unit patterns having three sides connected vertically on the inside and one side connected vertically on the outside can be connected in the longitudinal direction to form a concave-convex shape, and in the second continuous pattern, the second unit patterns , having three sides connected vertically on the inner side, may be arranged so that they enter the bulge on the inner side of the specified first unit relief with a given interval, and may be discontinuously arranged so that they extend in the longitudinal direction.

In the first continuous pattern, the first unit patterns having three sides connected vertically on the inside and one side connected vertically on the outside can be connected in the longitudinal direction to form a concave-convex shape, and in the second continuous pattern, the second unit patterns reliefs having a first straight line and a second straight line vertically connected to said first straight line may be positioned so that they enter the bulge from the inside of said first unit relief with a predetermined interval, and connected so that they extend in a longitudinal direction.

In a method for manufacturing a radiant tube device according to another aspect of the present invention, a radiant tube device according to any one of paragraphs. 1-10 are produced by printing a first continuous pattern and a second continuous pattern, passing side by side and spaced from each other by a predetermined interval, on the surface of a pipe having an internal channel by 3D modeling.

In a method for manufacturing a radiant tube device according to another aspect of the present invention, a radiant tube device according to any one of paragraphs. 1-10 are made by welding a first continuous pattern and a second continuous pattern, passing next to each other and spaced from each other by a predetermined interval, on the surface of a pipe having an internal channel, using any type of welding from the following: cold metal transfer, tungsten welding electrode in an inert gas environment and welding with a metal electrode in an inert gas environment.

ADVANTAGES

A radiant tube device capable of increasing the efficiency of heat treatment in an annealing furnace by increasing the efficiency of radiant heat, and a method for its manufacture are proposed.

DESCRIPTION OF THE DRAWINGS

Fig. 1 is a view illustrating heat treatment of a strip passing through the interior of a heat treatment apparatus according to an exemplary embodiment;

Fig. 2 is a view illustrating an example in which the strip is heat treated with radiant heat emitted from the radiant tube apparatus shown in FIG. 1;

Fig. 3 is a view showing in detail the arrangement of the radiant tube shown in FIG. 1;

Fig. 4 is a view showing an exemplary embodiment of a zigzag pattern located on the surface of the radiant tube shown in FIG. 1;

Fig. 5 is a photograph illustrating the zigzag pattern shown in FIG. 4;

Fig. 6 is a view showing an exemplary sawtooth pattern located on the surface of the radiant tube shown in FIG. 1;

Fig. 7 is a view showing another exemplary embodiment of the zigzag pattern located on the surface of the radiant tube shown in FIG. 1;

Fig. 8 is a view showing another exemplary sawtooth pattern located on the surface of the radiant tube shown in FIG. 1;

Fig. 9 is a view showing an exemplary embodiment of a concave-convex relief disposed on the surface of the radiant tube shown in FIG. 1;

Fig. 10 is a view showing another exemplary embodiment of a concave-convex pattern located on the surface of the radiant tube shown in FIG. 1;

Fig. 11 is a view showing another exemplary embodiment of a concave-convex relief disposed on the surface of the radiant tube shown in FIG. 1;

Fig. 12 is a view showing another exemplary embodiment of a concave-convex relief disposed on the surface of the radiant tube shown in FIG. 1.

MODES FOR CARRYING OUT THE INVENTION

Hereinafter, exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which like reference numerals designate like elements, although the exemplary embodiments differ and unnecessary description thereof is omitted. In the following description, the use of words such as "module", "part", or "single" used to refer to elements is provided only to facilitate the explanation of the present invention, without having any significant meaning in itself. In describing the present invention, if a detailed explanation of a relevant known function or construction is deemed to be unnecessarily distracting from the gist of the present invention, such explanation is omitted but will be understood by those skilled in the art. The accompanying drawings of the present invention are intended to provide an understanding of the present invention and should not be construed as limiting. In addition, the present invention is not limited to the specific form described, but includes all modifications, equivalents and substitutions without deviating from the scope and spirit of the present invention.

It should be understood that although the terms "first", "second", etc. may be used in this document. to describe the various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

It should be understood that when one element is referred to as "connected to" or "engaged with" another element, it may be connected directly to the other element, or be directly engaged with the other element, or may be connected to or in engagement with the other element. meshing with it when there is another element between them. However, it should be understood that when one element is referred to as being "directly connected to" or "in direct engagement with" another element, it may be connected to or engaged with the other element without the other element in between.

It is also to be understood that the terms "comprises" or "has" as used herein indicate the presence of the indicated features, steps, operations, components, parts, or combinations thereof, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

On FIG. 1 is a view illustrating the heat treatment of a strip passing through the interior of a heat treatment apparatus according to an exemplary embodiment of the invention, FIG. 2 is a view illustrating an example in which a strip is heat treated by radiant heat emitted from the radiant tube apparatus shown in FIG. 1 in FIG. 3 is a view showing in detail the arrangement of the radiant tube shown in FIG. 1 and in Fig. 4-12 are views showing various exemplary continuous patterns located on the surface of the radiant tube shown in FIG. 1.

As shown in FIG. 1, the radiant tube device 100 heats the metal material (strip, hereinafter referred to as "strip") S passing through the heat treatment furnace 1 maintained at a certain temperature to treat the surface. The radiant tube device 100 can be installed in the furnace 1, but is not limited to this, and can be installed in various other heat treatment facilities.

As shown in FIG. 2, a flame generated by a combustion nozzle (not shown) circulates inside the device 100 to heat it, and the strip S is heated indirectly by radiant heat radiated from the heated device 100. Here, the combustion nozzle atomizes and combusts gas, liquid or powder fuel for heating device 100. For example, a burner for combustion includes, without limitation, a burner and may contain various combustion means that can be installed in device 100. Strip S is a metal material processed in various ways, such as casting, forging, rolling, extrusion, and may include, for example, a steel plate.

As shown in FIG. 3, the device 100 includes a tube 110 having an internal passage through which the heat generated by the flame passes. When the tube 110 is heated by the flame generated therein, radiant heat is radiated to the outside to heat the low-temperature strip S. Thus, oxidation of the strip S is prevented.

The pipe 110 may include straight flow sections 111a and 111b: 111 extending in a straight line and a curved flow section 113 connected to the ends of the straight sections 111a and 111b: 111 such that the straight sections 111a and 111b: 111 are parallel to each other to form U-shaped. For example, tube 110 may be U-shaped or W-shaped depending on the size and heating temperature of the strip S, but is not limited to this.

Pipe 110 has continuous reliefs formed on its outer surface. In this case, the surface area for radiation heat radiation is increased, thereby increasing the efficiency of radiation heat. As the height of the continuous pattern increases, the surface area increases, thereby increasing the efficiency of the radiant heat, but the optimum height can be set depending on the location of the device 100 or the distance to other nearby facilities.

As shown in FIG. 4-12, the continuous pattern includes a first continuous pattern 300 and a second continuous pattern 400 that are spaced apart and extend adjacent to each other. In particular, the first continuous pattern 300 and the second continuous pattern 400 are independent patterns that do not touch each other and do not have common component sides, but are spaced apart from each other and extend close to each other.

Each relief, first 300 and second 400, can be made by joining single reliefs having a predetermined height from the outer surface of the pipe 110 in the longitudinal direction. For example, a continuous pattern can be 3D printed by additive manufacturing (hereinafter referred to as “3D printing”), such as directional energy deposition, cold transfer welding, tungsten inert gas welding, metal inert gas welding, etc. .d.

On FIG. 4A is a view illustrating a first unit relief 310 containing either the hypotenuse or the vertical side of a right triangle, FIG. 4B is a view illustrating a second unit relief 410 containing a straight line, and FIG. 4C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are connected in the longitudinal direction to form a zigzag shape, and second continuous patterns 400 in which the second unit patterns 410 are connected in the longitudinal direction to form a straight line.

As shown in FIG. 3, the first continuous patterns 300 and the second continuous patterns 400 shown in FIG. 4C may be provided on the outer surface of pipe 110. For example, when the continuous pattern shown in FIG. 3 is formed on the outer surface of the pipe 110 by cold transfer welding, the height of the continuous pattern can be 3 mm or more, and the height-to-thickness ratio of the continuous pattern can be 1.0 or more, thereby improving the efficiency of radiant heat. In particular, when welding under conditions where the diameter of the welding wire may be 0.6 mm or more and 1.5 mm or less, the welding current may be 70 A or more, the welding voltage may be 8 V or more and 12 V or less, the distance between the contact tip and the work surface can be 10mm or more and 40mm or less, and the welding speed can be 0.3m/min or more and 0.7m/min or less, the height of the continuous pattern can be 3mm or more, and the ratio of height to thickness of the continuous pattern may be 1.0 or more. In addition, the first continuous pattern 300 and the second continuous pattern 400 are not limited to cold transfer welding, but are performed by various types of welding such as tungsten inert gas welding or metal inert gas welding.

For example, with regard to the execution of the first continuous pattern 300 and the second continuous pattern 400 shown in FIG. 4 and 5, by printing 44 pairs of single patterns on a single device 100 with a height of 3.34 mm, the radiant heat efficiency is improved by 13.38% compared to the radiant tube device 100 on which nothing is printed. Compared with an 8.6% improvement in the radiant heat efficiency of the honeycomb pattern compared to the radiant tube device 100 on which nothing is printed under the same conditions, the improvement in the radiant heat of the first continuous pattern 300 and the second continuous pattern 400 is significant. .

In addition, the first continuous pattern 300 and the second continuous pattern 400 shown in FIG. 4 and 5 may be made in contact with each other. Thus, the point of the first continuous pattern 300 adjacent to the second continuous pattern 400 can be configured to be directly connected to the second continuous pattern 400. 400 is improved by 12.2% compared to the radiant tube device 100 in which nothing is printed.

On FIG. 6A is a view illustrating a first unit relief 310 having two sides with a predetermined included angle of 9°, FIG. 6B is a view illustrating a second unit relief 410 containing a straight line, and FIG. 6C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are joined in the longitudinal direction to form a sawtooth shape, and second continuous patterns 400 in which the second unit patterns 410 are joined in the longitudinal direction to form a straight line. Here, the predetermined included angle 0° can be set to an arbitrary angle greater than 0° and less than 180°, which is also applicable in the following description.

On FIG. 7A is a view illustrating a first unit relief 310 containing either the hypotenuse or the vertical side of a right triangle, FIG. 7B is a view illustrating a second unit pattern 410 that contains either the hypotenuse or the vertical side of a right triangle and whose center is moved parallel by a predetermined distance d in the longitudinal direction from the center of the first unit pattern 310, and FIG. 7C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are joined in the longitudinal direction to form a zigzag shape, and second continuous patterns 400 in which the second unit patterns 410 are joined in the longitudinal direction to form a zigzag shape. For example, the predetermined distance d may be specified to be less than the horizontal spacing between the first unit pattern 310 and the second unit pattern 410, which is also equally applicable in the following description.

On FIG. 8A is a view illustrating a first unit relief 310 containing two sides with a predetermined included angle of 8°, FIG. 8B is a view illustrating a second unit pattern 410 that has two sides with a predetermined included angle of 0° and whose center is offset parallel by a predetermined distance d in the longitudinal direction from the center of the first unit pattern 310, and FIG. 8C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are longitudinally joined to form a sawtooth shape, and second continuous patterns 400 in which the second single pattern patterns 410 are longitudinally joined to form a sawtooth shape.

On FIG. 9A is a view illustrating a first unit relief 310 having three sides joined vertically on the inside and one side joined vertically on the outside, FIG. 9B is a view illustrating a second unit relief 410 containing a straight line, and FIG. 9C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are connected to each other in the longitudinal direction to form a concave convex shape, and second continuous patterns 400 in which the second unit patterns 410 are connected to each other in the longitudinal direction to form straight line.

On FIG. 10A and FIG. 10B are views illustrating a first unit pattern 310 and a second unit pattern 410 in which one of the four quadrilateral sides extends vertically to the outside of the other adjacent side, respectively, and FIG. 10C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are connected to each other in the longitudinal direction to form a concave-convex shape, and second continuous patterns 400 in which the second unit patterns 410 are connected to each other in the longitudinal direction to form concave-convex shape.

On FIG. 11A is a view illustrating a first unit relief 310 having three vertically connected sides on the inside and one side vertically connected on the outside, FIG. 11B is a view illustrating a second unit relief 410 having three sides connected vertically to an inner side, and FIG. 11C is a view illustrating the first continuous patterns 300 in which the first unit patterns 310 are connected to each other in the longitudinal direction to form a concave-convex shape, and the second continuous patterns 400 are printed in which the second unit patterns 410 are discontinuously spaced at a predetermined interval. so that they enter the first continuous relief 300 from the inside of the convex portion. In this case, the second unit patterns 410 may be positioned to extend at a predetermined interval within a distance where the second unit pattern 410 is not in contact with the inner side of the convex portion of the first continuous pattern 300.

On FIG. 12A is a view illustrating a first unit relief 310 having three vertically connected sides on the inside and one side vertically connected on the outside, FIG. 12B is a view illustrating a second unit relief 410 comprising a first straight line 411 and a second straight line 413 connected vertically to an arbitrary location on the first straight line 411, and FIG. 12C is a view illustrating first continuous patterns 300 in which the first unit patterns 310 are joined to each other in the longitudinal direction to form a concave-convex shape, and second continuous patterns 400 are printed in which the second straight line 413 is positioned to enter from at a predetermined interval from the inside of the convex part of the first continuous relief 300, and which are connected to each other in the longitudinal direction. In this case, the second straight line 413 of the second single pattern 410 may be positioned so that it extends at a predetermined interval within a distance in which the second straight line 413 is not in contact with the inner side of the convex portion of the first continuous pattern 300.

While exemplary embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements are contemplated by those skilled in the art to which the present invention pertains.

Claims (12)

1. A radiant tube device comprising a tube having an internal channel, wherein the tube has a first continuous relief and a second continuous relief passing on the surface next to each other and spaced from each other by a predetermined distance, and in each continuous relief, the first and second, single reliefs having a given height from the specified surface are connected to each other in the longitudinal direction. 2. The device according to claim. 1, in which the pipe contains straight flow sections, passing in a straight line, and a curved flow section connected to the ends of the straight flow sections so that the straight flow sections are parallel. 3. The device according to claim 1, wherein in the first continuous pattern, the first unit patterns containing the hypotenuse or the vertical side of the right triangle are connected to each other to form a zigzag shape, and in the second continuous pattern, the second unit patterns formed by straight lines are connected to each other. with a friend to form a straight line. 4. The device according to claim 1, in which in the first continuous relief the first single reliefs containing two sides with a given included angle are connected in the longitudinal direction with the formation of a sawtooth shape, and in the second continuous relief the second single reliefs formed in the form of a straight line, connected to each other to form a straight line. 5. The device according to claim 1, in which in each continuous relief, the first and second, single reliefs containing the hypotenuse or the vertical side of a right triangle are connected to each other in the longitudinal direction to form a zigzag shape, while the centers of the single reliefs forming the second continuous relief, shifted parallel to a predetermined distance in the longitudinal direction from the centers of single reliefs, forming the first continuous relief. 6. The device according to claim 1, in which in each continuous relief, first and second, single reliefs having two sides with a given included angle are connected in the longitudinal direction to form a sawtooth shape, while the centers of the single reliefs forming the second continuous relief, displaced in parallel by a predetermined distance in the longitudinal direction from the centers of the single reliefs forming the first continuous relief. 7. The device according to claim 1, wherein in the first continuous pattern, the first unit patterns having three sides connected vertically on the inside and one side connected vertically on the outside are connected in the longitudinal direction to form a concave-convex shape. , and in the second continuous pattern, second unit patterns formed from straight lines are connected in the longitudinal direction to form a straight line. 8. The apparatus of claim. 1, in which in each continuous relief, the first and second, unit reliefs containing three sides connected vertically on the inside, and one side connected vertically on the outside, are connected in the longitudinal direction with the formation concave-convex shape. 9. The apparatus of claim 1, wherein in the first continuous pattern, the first unit patterns, having three sides connected vertically on the inside and one side connected vertically on the outside, are connected in the longitudinal direction to form a concave-convex shape. , and in the second continuous relief, the second unit reliefs, having three sides connected vertically from the inside, are located so that they enter the bulge from the inside of the specified first unit relief with a predetermined interval, and discontinuously arranged so that they pass in the longitudinal direction. 10. The apparatus of claim 1, wherein in the first continuous pattern, the first unit patterns, having three sides connected vertically on the inside and one side connected vertically on the outside, are connected in the longitudinal direction to form a concave-convex shape. , and in the second continuous relief, the second unit reliefs, having the first straight line and the second straight line connected vertically with the specified first straight line, are located so that they enter the bulge from the inside of the specified first unit relief with a given interval, and are connected so that they run in the longitudinal direction. 11. A method of manufacturing a radiant tube device according to any one of paragraphs. 1-10 by printing a first continuous pattern and a second continuous pattern extending side by side and spaced from each other by a predetermined interval on the surface of a pipe having an internal channel by 3D modeling. 12. A method of manufacturing a radiant tube device according to any one of paragraphs. 1-10 by welding a first continuous pattern and a second continuous pattern, passing next to each other and separated from each other by a predetermined interval, on the surface of a pipe having an internal channel, using any type of welding from the following: cold metal transfer, tungsten electrode welding in an inert gas environment and welding with a metal electrode in an inert gas environment.

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