KR102283687B1 - Multiple pipe - Google Patents

Abstract

The present invention is to provide a multi-pipe having high durability, such as a substantially seamless pipe, by combining a plurality of joint pipes. According to an embodiment of the present invention, a multi-pipe comprises: a first pipe extending parallel to a central axis extending in a first direction; and a second pipe extending along the central axis, disposed inside the first pipe, and having a hollow portion defined therein. One or more recesses recessed from an inner circumferential surface of the first pipe and arranged in a spiral shape about the central axis are defined, and the second pipe includes one or more irregularities protruding from an outer circumferential surface, arranged in a spiral shape about the central axis, and arranged in the recess.

Description

MULTIPLE PIPE

The present invention relates to a multi-pipe, and more particularly, to a multi-pipe including a plurality of pipes having different diameters.

In general, an industrial pipe may be divided into a joint pipe having a joint portion and a seamless pipe having no joint portion according to a manufacturing method.

A typical example of the joint pipe is an ERW (Electric Resistance Welding) pipe. For example, the ERW pipe may be manufactured by bending a plate material into a hollow tube shape and then electric resistance welding the joint portion.

A seamless pipe refers to a pipe that has no seams. For example, the seamless pipe may be manufactured by applying heat to a round bar to form a hollow. Since the seamless pipe is manufactured by a non-welding method, it may have higher durability than a joint pipe.

For example, as a pipe through which a high-pressure fluid moves, a seamless pipe may be more suitable than an ERW pipe. However, there is a problem that the manufacturing cost of the seamless pipe is higher than that of the ERW pipe. In addition, the seamless pipe has a large variation in thickness for each part, and has disadvantages in that the surfaces of the inner and outer circumferential surfaces are not beautiful.

An object of the present invention is to provide a multi-pipe having high durability, such as a substantially seamless pipe, by combining a plurality of joint pipes.

The multi-pipe according to an embodiment of the present invention includes a first pipe extending parallel to a central axis extending in a first direction, and a first pipe extending along the central axis, disposed inside the first pipe, and having a hollow portion therein and a defined second pipe. One or more recesses recessed from the inner circumferential surface and arranged in a spiral shape about the central axis are defined in the first pipe, and the second pipe protrudes from the outer circumferential surface and arranged in a spiral shape about the central axis, wherein one or more irregularities disposed in the recess.

According to an embodiment of the present invention, a first welding portion extending parallel to the central axis may be defined in the first pipe, and a second welding portion extending parallel to the central axis may be defined in the second pipe. . When viewed from the first direction, the first welding portion and the second welding portion may be spaced apart in a circumferential direction.

According to an embodiment of the present invention, as the irregularities of the second pipe arranged in a spiral shape are arranged in the recess of the first pipe, the first pipe and the second pipe may be stably coupled to each other.

In addition, by arranging the first welded portion of the first pipe and the second welded portion of the second pipe to be spaced apart from each other in the circumferential direction, durability of the multi-pipe may be improved.

1 is a perspective view exemplarily showing a multi-pipe according to an embodiment of the present invention.
FIG. 2 is a view exemplarily illustrating the first pipe shown in FIG. 1 .
FIG. 3 is a view exemplarily illustrating the second pipe shown in FIG. 1 .
FIG. 4 is a view illustrating the multi-pipe shown in FIG. 1 as viewed from the first direction.
5 is a view exemplarily showing a multi-pipe according to an embodiment of the present invention.
6 is a view exemplarily showing a multi-pipe according to an embodiment of the present invention.
7 is a flowchart illustrating a method of manufacturing a multi-pipe according to an embodiment of the present invention.
8 and 9 are views for explaining the process described in FIG.

In this specification, when a component (or region, layer, portion, etc.) is referred to as being “on,” “connected to,” or “coupled with” another component, it is directly disposed/on the other component. It means that it can be connected/coupled or a third component can be placed between them.

Like reference numerals refer to like elements. In addition, in the drawings, thicknesses, ratios, and dimensions of components are exaggerated for effective description of technical content.

“and/or” includes any combination of one or more that the associated configurations may define.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In addition, terms such as "below", "below", "above", "upper" and the like are used to describe the relationship of the components shown in the drawings. The above terms are relative concepts, and are described with reference to the directions indicated in the drawings.

Unless defined otherwise, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Also, terms such as terms defined in commonly used dictionaries should be construed as having a meaning consistent with their meaning in the context of the relevant art, and unless they are interpreted in an ideal or overly formal sense, they are explicitly defined herein do.

Terms such as “comprise” or “have” are intended to designate that a feature, number, step, action, component, part, or combination thereof described in the specification is present, and includes one or more other features, numbers, or steps. , it should be understood that it does not preclude the possibility of the existence or addition of , operation, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

multiple pipes

1 is a perspective view exemplarily showing a multi-pipe according to an embodiment of the present invention.

Referring to FIG. 1 , a multi-pipe 100 according to an embodiment of the present invention may have a tube shape. For example, the multi-pipe 100 may have a cylindrical shape extending in parallel with the central axis CX. The central axis CX is defined as an imaginary line parallel to the first direction DR1 and passes through the center of the multi-pipe 100 .

According to an embodiment of the present invention, a hollow portion 101 may be defined in the multi-pipe 100 . The hollow part 101 may extend parallel to the first direction DR1 . Both end portions of the hollow part 101 may be opened based on the first direction DR1 . Accordingly, the hollow part 101 may communicate with the outside.

According to an embodiment of the present invention, a fluid may flow in the hollow portion 101 of the multi-pipe 100 . For example, high-pressure gas or liquid may move in one direction through the hollow portion 101 of the multi-pipe 100 .

The multi-pipe 100 according to an embodiment of the present invention includes a plurality of pipes having different diameters. For example, the multi-pipe 100 includes a first pipe 110 and a second pipe 120 extending parallel to the central axis CX.

According to an embodiment of the present invention, the second pipe 120 may be disposed inside the first pipe 110 . For example, the first pipe 110 may surround the second pipe 120 in the second direction DR2 . In this specification, the second direction DR2 indicates a clockwise direction when viewed from the first direction DR1 and substantially defines a circumferential direction.

According to an embodiment of the present invention, the inner circumferential surface of the first pipe 110 may contact the outer circumferential surface of the second pipe 120 . The hollow portion 101 of the multi-pipe 100 may be substantially defined by an inner circumferential surface of the second pipe 120 .

According to an embodiment of the present invention, the first pipe 110 and the second pipe 120 may include different materials. For example, the first pipe 110 may include a first metal material, and the second pipe 120 may include a second metal material including a material different from the first metal material.

As a result, in the multi-pipe 100 according to the present invention, the material of the first pipe 110 disposed on the outside and the material of the second pipe 120 disposed on the inside can be freely selected according to the required design conditions. .

According to an embodiment of the present invention, the first pipe 110 and the second pipe 120 may be coupled to each other through a spiral-shaped coupling structure. Hereinafter, the coupling structure between the first pipe 110 and the second pipe 120 will be described in more detail.

FIG. 2 is a view exemplarily illustrating the first pipe shown in FIG. 1 . Specifically, FIG. 2(a) is a perspective view of the first pipe 110, and FIG. 2(b) shows the first pipe 110 as viewed from the first direction DR1.

Referring to FIG. 2A , one or more recesses 111 are defined in the first pipe 110 . The recess 111 may be defined in the inner circumferential surface 110_i of the first pipe 110 . Specifically, the recess 111 may be formed by being depressed from the inner circumferential surface 110_i of the first pipe 110 . The recess 111 may be disposed in a spiral direction with respect to the central axis CX.

As shown, a plurality of recesses 111 may be defined in the inner circumferential surface 110_i of the first pipe 110 . For example, four recesses 111 may be defined in the first pipe 110 . However, this is only an example, and the number of the recesses 111 is not limited to the illustrated bar.

According to an embodiment of the present invention, the recesses 111 may be disposed to be spaced apart from each other. For example, when viewed from the first direction DR1 , the recesses 111 may be spaced apart from each other at regular intervals along the circumferential direction (ie, the second direction DR2 ).

According to an embodiment of the present invention, a first welding portion 112 may be defined in the first pipe 110 . For example, the first pipe 110 may be an ERW (Electric Resistance Welding) pipe. The first welding portion 112 may be formed by electric resistance welding. The first welding portion 112 may extend parallel to the central axis CX.

For convenience of explanation, although the first welding part 112 is illustrated, in fact, the first welding part 112 may not be visually recognized by the user.

Referring to FIG. 2B , when viewed from the first direction DR1 , the recess 111 may have a trapezoidal shape. For example, the recess 111 may include a first wall 111_a, a second wall 111_b, and a third wall 111_c.

According to an embodiment of the present invention, the first wall 111_a and the second wall 111_b may extend from the inner circumferential surface 110_i toward the outer circumferential surface 110_o. The first wall 111_a and the second wall 111_b may face each other.

The third wall 111_c may be disposed between the first wall 111_a and the second wall 111_b. The third wall 111_c may be spaced apart from the central axis CX than the inner circumferential surface 110_i. The third wall 111_c may have a curved surface.

According to an embodiment of the present invention, the first angle α1 between the first wall 111_a and the third wall 111_c is the second angle α1 between the second wall 111_b and the third wall 111_c. α2) may be different. For example, the second angle α2 may be greater than the first angle α1 .

According to an embodiment of the present invention, the outer diameter of the first pipe 110 may be constant. For example, when viewed in the first direction DR1 , the distance from the central axis CX to the outer peripheral surface 110_o of the first pipe 110 may be constant.

According to an embodiment of the present disclosure, when viewed in the first direction DR1 , the distance from the central axis CX to the third wall 111_c is the outer peripheral surface of the first pipe 110 from the central axis CX. It is smaller than the distance to (110_o) (ie, the outer diameter of the first pipe 110), and the distance from the central axis CX to the inner circumferential surface 110_i of the first pipe 110 (ie, the first pipe 110) can be larger than the inner diameter of

According to an embodiment of the present invention, an angle between the recess 111 and the central axis CX may be greater than or equal to 10° and less than or equal to 30°. Preferably, an angle between the recess 111 and the central axis CX may be 20°. This will be described later.

FIG. 3 is a view exemplarily illustrating the second pipe shown in FIG. 1 . Specifically, FIG. 3A is a perspective view of the second pipe 120 , and FIG. 3B is a view of the second pipe 120 in the first direction DR1 .

Referring to FIG. 3A , one or more irregularities 121 are defined in the second pipe 120 . The unevenness 121 may be defined on the outer peripheral surface 120_o of the second pipe 120 . For example, the unevenness 121 may be formed to protrude from the outer peripheral surface 120_o of the first pipe 120 . The unevenness 121 may be disposed in a spiral direction with respect to the central axis CX.

As shown, a plurality of irregularities 121 may be defined on the outer circumferential surface 120_o of the second pipe 120 . For example, four irregularities 121 may be defined on the outer circumferential surface 120_o of the second pipe 120 . However, the number of irregularities 121 is not limited to the above-described bar.

According to an embodiment of the present invention, the irregularities 121 may be disposed to be spaced apart from each other. For example, when viewed from the first direction DR1 , the irregularities 121 may be spaced apart from each other at regular intervals along the circumferential direction (ie, the second direction DR2 ).

According to an embodiment of the present invention, a second welding portion 122 may be defined in the second pipe 120 . Like the first pipe 110 described above, the second pipe 120 may be an ERW pipe, and the second weld portion 122 may be formed by electric resistance welding.

According to an embodiment of the present invention, the second welding portion 122 may extend parallel to the central axis CX. Like the first welding part 112 , the second welding part 122 may not be visually recognized by the user.

Referring to FIG. 3B , when viewed from the first direction DR1 , the unevenness 121 may have a shape corresponding to the recess 111 (refer to FIG. 2 ). For example, the unevenness 121 may have a trapezoidal shape. The unevenness 121 may include a first surface 121_a, a second surface 121_b, and a third surface 131_c.

The first surface 121_a and the second surface 121_b may protrude from the outer peripheral surface 120_o. The first surface 121_a and the second surface 121_b may be opposite to each other.

The third surface 121_c may be disposed between the first surface 121_a and the second surface 121_b. The third surface 121_c may be spaced apart from the central axis CX than the outer peripheral surface 120_o. The third surface 121_c may be a curved surface.

According to an embodiment of the present invention, the third angle α3 formed by the first surface 121_a and the third surface 121_c is the fourth angle (α3) formed by the second surface 121_b and the third surface 121_c. α4) may be different. For example, the fourth angle α4 may be greater than the third angle α3 . The third angle α3 may be equal to the first angle α1, and the fourth angle α4 may be equal to the second angle α2 (refer to FIG. 2(b) ).

According to an embodiment of the present invention, the inner diameter of the second pipe 120 may be constant. For example, when viewed in the first direction DR1 , the distance from the central axis CX to the inner circumferential surface 110_i of the second pipe 120 may be constant.

According to an embodiment of the present invention, an angle between the unevenness 121 and the central axis CX may be greater than or equal to 10° and less than or equal to 30°. Preferably, the angle between the unevenness 121 and the central axis CX may be 20°.

FIG. 4 is a view illustrating the multi-pipe shown in FIG. 1 as viewed from the first direction.

Referring to FIG. 4 , each of the irregularities 121 of the second pipe 120 may be disposed on the corresponding recess 111 of the first pipe 110 . Specifically, the first surface 121_a of the concavo-convex 121 is disposed on the first wall 111_a of the recess 111, and the second surface 121_b is disposed on the second wall 111_b, The third surface 121_c may be disposed on the third wall 111_c.

According to an embodiment of the present invention, the first pipe 110 may be fixed to the second pipe 120 by coupling between the plurality of recesses 111 and the irregularities 121 . For example, when an axial force parallel to the first direction DR1 is applied to the multi-pipe 100 , the axial force causes the first pipe 110 to move integrally with the second pipe 120 , and the second pipe may not be separated from 120 .

In addition, as described above, in this embodiment, the recess 111 and the concavo-convex 121 are designed to form an angle in the range of 10° to 30° with the central axis CX, the first pipe 110 and the second The coupling force between the pipes 120 can be maximized.

If the angle between the recess 111 and the concavo-convex 121 with the central axis CX is less than 10°, the coupling force between the first pipe 110 and the second pipe 120 may be weakened. Conversely, when the angle between the recess 111 and the concavo-convex 121 with the central axis CX is greater than 30°, it is difficult to form the recess 111 on the inner circumferential surface 110_i of the first pipe 110 . can get

According to an embodiment of the present invention, the first welded portion 112 of the first pipe 110 may be spaced apart from the second welded portion 122 of the second pipe 120 in the second direction DR2 . Specifically, with respect to the central axis CX, the angle β formed between the first welding part 112 and the second welding part 122 may be greater than 0° and smaller than 360°.

According to an embodiment of the present invention, by arranging the first welding portion 112 and the second welding portion 122 to be intentionally spaced apart in the circumferential direction, the rigidity of the first welding portion 112 of the first pipe 110 is improved. The non-welded portion of the second pipe 120 is reinforced, and the non-welded portion of the first pipe 110 reinforces the rigidity of the second welded portion 122 of the second pipe 120, so that the multi-pipe 100 is high. can have durability.

In the following description, a description of the same configuration as that of the above-described embodiment will be omitted, and a configuration with a difference will be mainly described.

5 is a view exemplarily showing a multi-pipe according to an embodiment of the present invention.

An auxiliary concave-convex 113' and an auxiliary recess 123' may be defined in the multi-pipe 100' according to an embodiment of the present invention. Specifically, the auxiliary concavo-convex 113 ′ may protrude from the inner circumferential surface 110_i ′ of the first pipe 110 ′. One or more auxiliary irregularities 113 ′ may be defined, and may be defined near an end of the first pipe 110 ′.

The auxiliary recess 123 ′ may be recessed from the outer circumferential surface 120_o ′ of the second pipe 120 ′. One or more auxiliary recesses 123' may be defined, and may be defined near an end of the second pipe 120'.

According to an embodiment of the present invention, the auxiliary concavo-convex 113' may be disposed on the auxiliary recess 123' to reinforce the coupling force between the first pipe 110' and the second pipe 120'. there is.

6 is a view exemplarily showing a multi-pipe according to an embodiment of the present invention.

The multi-pipe 100 ″ according to an embodiment of the present invention may include a first pipe 110 ″ and a second pipe 120 ″ extending in the first direction DR1 . A plurality of irregularities 111 ″ protruding from the inner circumferential surface 110_i″ may be defined in the first pipe 110 ″. A plurality of recesses 121 ″ recessed from the outer circumferential surface 120_o″ may be defined in the second pipe 120 ″.

According to an embodiment of the present invention, the irregularities 111'' may be spaced apart from each other in the second direction DR2, and each of the irregularities 111'' spirals around the central axis CX. can be placed. The recesses 121 ″ may be spaced apart from each other in the second direction DR2 , and each of the recesses 121 ″ may be disposed in a spiral direction with respect to the central axis CX.

According to an embodiment of the present invention, each of the irregularities 111 ″ is disposed on the corresponding recess 121 ″, so that the first pipe 110 ″ is connected to the second pipe 120 ″. can be fixed.

Multi-pipe manufacturing method

7 is a flowchart illustrating a method of manufacturing a multi-pipe according to an embodiment of the present invention. 8 and 9 are views for explaining the process described in FIG.

7 and 8 , in step S1 , the first preliminary pipe 110_a is prepared. The first preliminary pipe 110_A may be manufactured by pultrusion molding the pipe PI.

In a state in which the plug 11 is inserted into the pipe PI, one side of the pipe PI is inserted into the die 12 . The pipe PI may become the first preliminary pipe 110_a as it passes through the die 12 .

The recess 111 of the first preliminary pipe 110_a may be formed by the spiral protrusion 13_a formed on the surface of the bearing 13 as the bearing 13 coupled to the plug 11 rotates. there is.

Step S2 prepares a second preliminary pipe. The outer diameter of the second preliminary pipe may be smaller than the inner diameter of the first preliminary pipe. For example, the second preliminary pipe may be manufactured by pultrusion molding the pipe PI shown in FIG. 8( a ). In this case, the bearing arranged on the plug can be removed.

7 and 9 , in step S3 , the second preliminary pipe 120_a is disposed inside the first preliminary pipe 110_a. Since the outer diameter of the second preliminary pipe 120_a is smaller than the inner diameter of the first preliminary pipe 110_a, a predetermined gap may be formed between the first preliminary pipe 110_a and the second preliminary pipe 120_a.

Step S4 manufactures the first pipe 110 and the second pipe 120 . For example, the first pipe 110 and the second pipe 120 may be manufactured by simultaneously pultruding the first preliminary pipe 110_a and the second preliminary pipe 120_a.

Specifically, in a state in which the plug 11-1 is inserted into the second preliminary pipe 120_a, the first preliminary pipe 110_a and the second preliminary pipe 120_a are inserted into the die 12-1. Each of the first preliminary pipe 110_a and the second preliminary pipe 120_a may be reduced in diameter while passing through the die 12 - 1 to become the first pipe 110 and the second pipe 120 .

In step S4, irregularities corresponding to the recesses of the first pipe 110 are formed on the outer circumferential surface of the second pipe 120, and thus the multi-pipe 100 shown in FIGS. 1 and 4 will be manufactured. can

Although it has been described with reference to the above embodiments, those skilled in the art can understand the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below.

It will be understood that various modifications and variations of the invention are possible. In addition, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, and all technical ideas within the scope of the following claims and their equivalents should be construed as being included in the scope of the present invention. .

100: multi-pipe 110: first pipe
111: recess 112: first weld
120: second pipe 121: irregularities
122: second welding part

Claims (8)

a first pipe extending parallel to a central axis extending in a first direction; and
and a second pipe extending along the central axis, disposed inside the first pipe, and having a hollow portion defined therein,
One or more recesses recessed from the inner circumferential surface of the first pipe and arranged in a spiral shape about the central axis are defined;
The second pipe includes one or more irregularities protruding from the outer circumferential surface, arranged in a spiral shape about the central axis, and arranged in the recess,
the recess comprises a first wall, a second wall opposite the first wall, and a third wall disposed between the first wall and the second wall;
The unevenness is disposed between the first face and the second face corresponding to the first face corresponding to the first wall, the second face corresponding to the second wall and facing the first face, and the third wall corresponding to the first face. comprising a third side,
A second angle between the second wall and the third wall is greater than a first angle between the first wall and the third wall,
A third angle formed by the first surface and the third surface is the same as the first angle, and a fourth angle formed by the second surface and the third surface is the same as the second angle. According to claim 1,
When viewed from the first direction, the distance from the central axis to the outer peripheral surface of the first pipe is constant,
When viewed from the first direction, the distance from the central axis to the inner peripheral surface of the second pipe is a constant multi-pipe. According to claim 1,
The recess is provided in plurality,
When viewed from a first direction, the multiple pipe recesses are spaced apart from each other at regular intervals along the circumferential direction. 4. The method of claim 3,
The irregularities are provided in plurality,
A multi-pipe, each of the irregularities being disposed in corresponding recesses. According to claim 1,
A first weld extending parallel to the central axis is defined in the first pipe,
A second weld extending parallel to the central axis is defined in the second pipe,
When viewed from the first direction, the multi-pipe is spaced apart from the first welding portion and the second welding portion in the circumferential direction. delete a first pipe extending parallel to a central axis extending in a first direction;
a second pipe extending along the central axis, disposed inside the first pipe, and having a hollow portion defined therein;
one or more irregularities protruding from the inner circumferential surface of the first pipe and arranged in a spiral shape about the central axis; and
at least one recess recessed from the outer circumferential surface of the second pipe and arranged in a spiral shape about the central axis;
the recess comprises a first wall, a second wall opposite the first wall, and a third wall disposed between the first wall and the second wall;
The unevenness is disposed between the first face and the second face corresponding to the first face corresponding to the first wall, the second face corresponding to the second wall and facing the first face, and the third wall corresponding to the first face. comprising a third side,
A second angle between the second wall and the third wall is greater than a first angle between the first wall and the third wall,
A third angle formed by the first surface and the third surface is the same as the first angle, and a fourth angle formed by the second surface and the third surface is the same as the second angle. preparing a first preliminary pipe including one or more recesses formed on an inner circumferential surface in a spiral direction with respect to a central axis extending in a first direction;
preparing a second preliminary pipe having an outer diameter smaller than the inner diameter of the first preliminary pipe and extending along the central axis;
disposing the second preliminary pipe inside the first preliminary pipe; and
manufacturing the first pipe and the second pipe by simultaneously pultruding the first preliminary pipe and the second preliminary pipe;
One or more spiral-shaped irregularities corresponding to the recesses are formed on the outer circumferential surface of the second pipe by the pultrusion molding,
the recess comprises a first wall, a second wall opposite the first wall, and a third wall disposed between the first wall and the second wall;
The unevenness is disposed between the first face and the second face corresponding to the first face corresponding to the first wall, the second face corresponding to the second wall and facing the first face, and the third wall corresponding to the first face. comprising a third side,
A second angle between the second wall and the third wall is greater than a first angle between the first wall and the third wall,
A third angle formed by the first surface and the third surface is the same as the first angle, and a fourth angle formed by the second surface and the third surface is the same as the second angle.

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