KR20180104922A - Pipe connection method and pipe connection apparatus - Google Patents

Abstract

Disclosed is a pipe connection method capable of reducing manufacturing costs. According to the present invention, the pipe connection method comprises: a step (a) of inserting the rear end part of a pipe to be connected into an expansion pipe part, which includes an expansion pipe section, and a changing section to connect the expansion pipe section and an unexpanded normal section on the front side of an expansion pipe; a step (b) of disposing a coupling tool to withdraw a swage ring, which is disposed to surround the outer circumference of the expansion pipe, on the rear side of the expansion pipe part to move the swage ring to a front side; and a step (c) of removing the coupling tool. In the step (b), the swage ring is moved to come in contact with and press a middle part excluding a rear introduction portion coming in contact with the swage ring only when the swage ring is introduced and a front unreached portion not in contact with the swage ring among the expansion pipe part, and the initial inner diameter of the swage ring before swaging is less than that of the expansion pipe section before swaging.

Description

TECHNICAL FIELD [0001] The present invention relates to a pipe connecting method,

The present invention relates to a pipe connecting method and a pipe connecting apparatus.

FIGS. 1A and 1B are cross-sectional views schematically showing the conventional pipe connecting apparatus before and after swaging.

1A and 1B, a conventional apparatus for connecting a pipe using a swaging principle includes a body 330 which cylindrically surrounds a certain region from the ends of the pipes 210 and 220, And swage rings 310 and 320 that linearly move along the longitudinal direction toward the center and guide the reduction of the outer diameter of the body.

The outer diameter of the body 330 is reduced due to the movement of the swaging rings 310 and 320 so that the gap between the inner surface of the body 330 and the outer surface of the pipes 210 and 220 is removed, (220) is firmly fixed to the body (330).

Conventional devices for connecting the pipes 210 and 220 using such a swaging principle have been commercialized in such a manner that the detailed shapes of the body and the ring are slightly different from each other while satisfying the two basic purposes of preventing fluid leakage and fixing the pipe .

The background technology of the present application is disclosed in Korean Patent Registration No. 1365539.

It is an object of the present invention to provide a pipe connecting device capable of reducing the weight and size and lowering the manufacturing cost through other forms of configuration and coupling methods while maintaining the advantages of the swaging method.

According to a first aspect of the present invention, there is provided a pipe connecting method comprising the steps of: (a) connecting a pipe section to an unshrouded general section, Inserting a rear end portion of the pipe to be connected in a pipe portion formed so as to include the connection pipe; (b) disposing a fastening tool for retracting the swaged ring disposed to surround the outer periphery of the expanding pipe at the rear of the expanded portion to move the swaged ring forward; And (c) removing the fastening tool, wherein the step (b) further comprises: a step of removing the fastening tool, Wherein the swaging ring moves the swaging ring so that the swaging ring is contacted and pressurized with respect to the intermediate portion excluding the reaching portion, and in the step (b), the initial inner diameter before swaging of the swaging ring is adjusted by swaging May be smaller than the initial initial diameter.

The above-described task solution is merely exemplary and should not be construed as limiting the present disclosure. In addition to the exemplary embodiments described above, there may be additional embodiments in the drawings and the detailed description of the invention.

According to the above-mentioned problem solving means of the present invention, by connecting the pipe to be connected and the pipe to be connected to each other in such a manner that the pipe to be connected is inserted into the pipe-expanding portion formed in the pipe expanding and the swaging ring presses the middle portion of the pipe- Can be provided at a length necessary to cover the middle portion of the bending portion so that a pipe connection portion having a simple shape and having advantages of swaged connection without additional raw material can be formed. As a result, the size of the pipe connecting device can be reduced and the structure can be simplified, so that the weight and the material can be considerably reduced, and the freedom of designing the piping structure can be further improved.

Further, in the prior art, only the friction between the swaging ring and the contact surface of the object with which the swaging ring is brought into contact with the swaging ring prevents deviation of the swaging ring. According to the above-mentioned problem solving means, So that the forwardly unreachable portion and the rearwardly introduced portion of the expanding portion can have a relatively larger outer diameter than the intermediate portion so that the limiting jaw that restricts the forward movement of the surrounding swaging ring, It can be automatically formed by swaging without a separate component.

In addition, according to the above-mentioned problem solving means of the present invention, the pipe connecting device having the advantage that the end time of each of the two pipes is swaged and interconnected by the forward movement of the swage ring, have.

Figs. 1A and 1B are cross-sectional views schematically showing a conventional pipe connecting device before and after swaging.
2 is a schematic flowchart for explaining a pipe connecting method according to an embodiment of the present invention.
3 is a schematic longitudinal sectional view showing a state before the swaging ring is moved forward in step S300 of the pipe connecting method according to an embodiment of the present invention. Sectional view showing that the roller dies are disposed inside the expanding pipe in order to illustrate step S100.
5 is a schematic longitudinal cross-sectional view illustrating that the roller dies are disposed inside the expanding pipe to explain the step S100 of the pipe connecting method according to one embodiment of the present invention.
6 is a schematic longitudinal sectional view and partially enlarged view showing the state after step S400 of the pipe connecting method according to the embodiment of the present invention.
FIG. 7 is a schematic longitudinal cross-sectional view illustrating a fastening tool according to another embodiment of the pipe connecting method according to an embodiment of the present invention, showing a state before the swaging ring is moved forward in step S300. FIG.
8 is a schematic vertical cross-sectional view illustrating the state before the swaging ring is moved forward in step S300 to explain another embodiment (sealing ring application) of the pipe connecting method according to the embodiment of the present invention .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, the same reference numbers are used throughout the specification to refer to the same or like parts.

Throughout this specification, when a part is referred to as being "connected" to another part, it is not limited to a case where it is "directly connected" but also includes the case where it is "electrically connected" do.

It will be appreciated that throughout the specification it will be understood that when a member is located on another member "top", "top", "under", "bottom" But also the case where there is another member between the two members as well as the case where they are in contact with each other.

Throughout this specification, when an element is referred to as "including " an element, it is understood that the element may include other elements as well, without departing from the other elements unless specifically stated otherwise.

Further, in the present description, the longitudinal direction (longitudinal direction) of the pipe is defined as the longitudinal direction. For example, the 3 o'clock direction (right direction) may be forward and the 9 o'clock direction (left direction) may be rearward with reference to Fig. However, the longitudinal direction of the pipe does not depend only on the front-rear direction in the actual arrangement of the pipe. In other words, the pipe can be arranged in various directions (for example, up-down direction, diagonal direction, etc.) according to the need of the pipe arrangement as well as the longitudinal direction.

First, a pipe connecting method according to an embodiment of the present invention (hereinafter, referred to as " main pipe connecting method ") will be described.

Referring to FIG. 2, the present pipe connecting method may include a step (S100) of forming an expanded portion 211 in the expanding pipe 210. 3, in step S100, an expansion section 2111 including a change section 2112 for connecting the expansion section 2111 and the expansion section 2111 to a general section not yet expanded is provided on the front side of the expansion pipe 210, ). 6, the expanded portion 211 can be divided into a rear introduction portion 211b, an intermediate portion 211a, and a front unreachable portion 211c. Here, the intermediate portion 211a and the non-frontal reaching portion 211c may be referred to as portions included in the expanding section 2111. [ Also, referring to FIG. 6, at least a part of the rear introduction parts 211b may be included in the expansion section 2111. FIG. However, the rear introduction portion 211b may be a portion that is in contact with the swage ring 15 while being introduced, and a part of the rear introduction portion 211b may be a portion included in the change section 2112. [

In step S100, the bulging portion 211 may be formed by a roll forming method. Rolling dies are a kind of cold working method in which a roller die is used to press a surface (outer surface or inner surface) of an object such as a pipe while rotating the object relative to the dice to form an object. 4 and 5, in step S100, the front side of the expansion pipe 210 includes an outer body 91 (mold body) having a hole having an inner diameter corresponding to the outer diameter of the expansion section 2111, And the roller dies 92 disposed in the roller dies 92. As shown in Fig. 4 and 5, a plurality of roller dies 92 are provided inside the holes, and the holes can be extended and moved toward the inner circumferential surface while rotating. The expansion portion 211 (the expansion section 2111 and the change section 2112) of the expansion pipe 210 can be formed by the rolling process using the outer body 91 and the roller dice 92. [

The roller dice 92 may have an outer shape corresponding to the inner protruding portion 2111a so that the inner protruding portion 2111a is formed on the inner peripheral surface of the intermediate portion 211a. For example, in the case where the roller dice 92 has an outer peripheral shape as shown in Figs. 4 and 5 (an outer peripheral shape that forms a cross-section of protrusive and convex shapes repeatedly protruding and recessed along the longitudinal direction And the inner protruding portion 2111a may be formed in a shape corresponding to the depressed portion of the uneven shape (see FIG. 3). Through the rolling process using the roller dies 92, an inner protruding portion 2111a which is in contact with the connection target pipe 220 at the time of swaging can be formed on the inner peripheral surface of the intermediate portion 211a.

3, at step S100, the inner protruding portion 2111a of the expanded portion 211 formed by the rolling process is formed to have an outer diameter (in particular, a maximum outer diameter in consideration of the tolerance) of the pre- It is preferable that it is processed to have a larger inner diameter. In addition, the expansion pipe 210 applied in step S100 may have the same inner diameter or the same material as the connection pipe 220.

3, the inner protrusion 2111a may include a sealing protrusion that seals between the expanding pipe 210 and the connecting pipe 220 and resists axial force acting on the connecting pipe 220 have. For example, the sealing protrusion may be provided with an annular structure extending continuously along the circumferential direction. Also, a plurality of sealing-type protrusions may be provided at intervals along the longitudinal direction. 4 and 5, the roller dice 92 is formed by continuously extending (annularly-shaped) annularly extending along the circumferential direction, and continuously extending (annularly-shaped) And may have an outer shape formed alternately.

In addition, the sealing protrusions may be formed in such a way that when the defects are present on the outer circumferential surface of the pipe 220 to be connected, the gratings adjacent to the defects form a closed space in the local region and can resist the torsion together. Like protrusions that are repeatedly arranged along the circumferential direction on the inner circumferential surface of the protruding portion 211a (see Fig. 6). In other words, the sealing protrusion may be provided so as to protrude in a lattice form. Such a lattice shape may be provided in an axisymmetric structure, but is not limited thereto. In order to form such a lattice shape, at least one of various processing methods other than the rolling process and the rolling process through the various roller dies 92 can be applied (combined).

In addition, the inner projecting portion 2111a may include a torsion-resistant protrusion that is resistant to the torsion acting on the pipe 220 to be connected. Illustratively, the torsion-resistant protrusions may have a nulling shape (spline). In other words, the torsion-resistant protrusions have a shape in which a longitudinally elongated tooth shape (continuously extending in the longitudinal direction) is repeatedly arranged along the circumferential direction on the inner circumference of the expanding pipe 210 ). In other words, the inner protruding portion 2111a may be provided so as to have a tooth profile when the inner circumference of the longitudinal section of the longitudinally incised middle portion 211a of the expanded portion 211 of the expanding pipe 210 is viewed. Such a torsion-resistant protrusion may be formed to extend from the middle portion 211a of the pipe 210 to the front non-reaching portion 211c or the rearward introducing portion 211b. In this case, the outer shape of the roller dice 92 may be a tooth shape (outer gear shape) corresponding to the torsion-resistant protrusion. For example, the roller dice 92 may have a shape extending from the intermediate portion to the front end or the rear end and an elongated valley extending from the intermediate portion to the front end or the rear end alternately along the circumferential direction. Further, the torsion-resistant protrusion can be applied in combination with the above-described sealing-type protrusion. Alternatively, the inner protrusion 2111a may be formed in an annular shape having an oblique slope (an acute angle slope of less than 90 degrees with respect to the axial direction of the pipe 210, or an acute angle slope of less than 90 degrees with respect to the circumferential direction) By forming the lattice-like protrusion as described above, both of the sealing protrusion and the torsion-resistant protrusion can be performed.

In this manner, the inner protrusion 2111a can be provided in various forms taking into account sealing, axial resistance, torsional resistance, etc. For this purpose, the roller dice 92 may be formed by combining roller dies 92 having various peripheral shapes, Other processing methods other than processing can be applied or combined.

The inner projecting portion 2111a may be formed integrally with the same material as the other portions of the pipe 210. [ The inner projecting portion 2111a may be a strain hardening portion (work hardening portion) having a higher hardness than the other portions of the pipe 210. [ The strain hardened portion having such high hardness can be formed by work hardening by cold plastic working such as machining in the rolling process. Accordingly, the inner protruding portion 2111a can be a source for easily digging the outer circumferential surface of the connection target pipe 220 in a swaging process to be described later to provide a strong and reliable sealing force.

The inner projecting portion 2111a is formed in the intermediate portion 211a of the expanded portion 211 and the swage ring 15 swings the intermediate portion 211a so that the outer diameter of the front non- The outer diameter of the middle portion 211a may be smaller than the outer diameter of the rear introduction portion 211b. Referring to Fig. 6, the front unreached portion 211c and the rearwardly introduced portion 211b may protrude more radially outward (radially outward) than the intermediate portion 211a having the inner protruding portion 2111a. 6, the forward unreached portion 211c and the rearwardly directed portion 211b may also be provided so as to protrude inwardly to the same or similar level as the inner protruding portion 2111a. The inner projecting portion 2111a may be regarded as a portion formed relatively protruding by an inner depression recessed inwardly by a projection projected on the outer periphery of the roller dice 92 during rolling, And the rear introduction portion 211b are relatively protruded relative to the inner depression.

Also, as described above, the outer diameter of the expansion section 2111 may be limited to an appropriate dimension desired by the designer corresponding to the inner diameter of the hole of the outer body 91. For example, the hole of the outer body 91 may be a hollow cylindrical shape in which a portion where the expansion section 2111 of the expansion pipe 210 is formed may be inserted.

4, in step S100, the roller dice 92 is inserted into the hole of the outer body 91 so as to prevent the expansion section 2111 from expanding to an uneven thickness or being bent toward one side and being processed. And can be arranged at equal intervals along the circumferential direction (circumferential direction). Illustratively, referring to FIG. 4, three or more roller dies 92 may be disposed.

8, in step S100, the sealing ring 17 may be inserted into the inside of the bellows 211 after the bellows pipe 210 is expanded, corresponding to the intermediate part 211a. Such a sealing ring 17 may be a prefabricated construction through various known processing methods. In step S100, after the sealing ring 17 is inserted, the inner diameter of the end portion of the front unreached portion 211c of the expanded portion 211 is reduced so as to prevent the sealing ring 17 from being disengaged forward The process (a process of punching the end portion of the front unreached portion) can be performed. The end of the front unreached portion 211c can be formed so that its inner diameter is smaller than the outer diameter of the sealing ring 17 so as to prevent the forward disengagement of the sealing ring 17. [ The sealing ring disposing process in the step S100 may be performed in place of the inner protruding portion 2111a forming process described above, but the present invention is not limited thereto. As another example, step S100 may be performed in the direction of combining the arrangement of the sealing ring 17 and the formation of the inner protrusion 2111a together.

In the sealing ring disposing process, the expanding of the expanding pipe 210 can be performed by the above-mentioned rolling method. In the process of inserting the separately processed sealing ring 17, it is sufficient that the expanding portion 211 is sufficiently inserted so that the sealing ring 17 can be disposed between the pre-swelling portion 211 and the connection target pipe 220 Proliferation is desirable. For example, the expansion portion 211 may be enlarged so that the inner diameters of the ring inner projecting portions 171 and 172 of the sealing ring 17 can correspond to the inner diameters of the inner projecting portion 2111a of the above- .

However, the expansion method of the expansion pipe 210 is not limited to the above-mentioned rolling method, and various expansion methods may be applied as necessary. Further, in the sealing ring disposing process, the process of reducing the inner diameter of the end portion of the front unreached portion 211c of the expanding portion 211 can also be performed by various processing methods including a rolling process.

In this manner, the sealing ring 17 can be disposed inside the middle portion 211a of the tube portion 211 through the step S100. Ring inner protrusions 171 and 172 and ring outer protrusions 173 and 174 may be formed on the sealing ring 17.

Referring to FIG. 8, the ring inner projections 171 and 172 are inwardly protruded so as to at least partially dig an outer circumferential surface of the pipe 220 to be connected at the time of swaging. The ring inner projections 171 and 172 can be understood to have the same or similar construction as the inner projections 2111a described above.

The ring inner protrusions 171 and 172 may include inner sealing protrusions that seal between the sealing ring 17 and the connection target pipe 220 and resist axial force acting on the connection target pipe 220.

For example, referring to Fig. 8, the inner sealing protrusion may be provided with an annular structure (see 171 in Fig. 8) extending continuously along the circumferential direction. Further, a plurality of inner sealing-type protrusions may be provided at intervals along the longitudinal direction. In addition, the inner sealing protrusions may be formed in such a way that when the defects are present on the outer circumferential surface of the pipe 220 to be connected, the gratings adjacent to the defects form a closed space in the local region and can resist the torsion as well. Like protrusions that are repeatedly arranged along the circumferential direction on the inner circumferential surface of the base member 17.

In addition, the ring inner projections 171 and 172 may include inner torsion-resistant protrusions that resist the torsion acting on the pipe 220 to be connected.

For example, referring to reference numeral 172 in FIG. 8, the inner torsion resistive protrusion may have a nulling shape (spline). In other words, the inner torsion-resistant protruding portion has a shape in which a vertically elongated tooth shape (continuously extending in the longitudinal direction) is repeatedly arranged along the circumferential direction on the inner circumference of the sealing ring 17 Shape). 8, the inner torsion-resistant protrusions may be applied in combination with the above-described inner sealing-type protrusions.

Further, as another example, the ring inner protrusions 171 and 172 may be formed in an annular shape having an oblique slope, or may be formed as a lattice protrusion as described above, thereby performing both the inner sealing protrusion and the inner torsion resistor protrusion As shown in FIG. The ring inner protrusions 171 and 172 can be provided in various forms considering sealing, axial resistance, torsional resistance and the like. For the provision of the sealing ring 17 having the ring inner protrusions 171 and 172, A variety of processing methods including rolling may be applied or combined.

8, the ring outer projections 173 and 174 are configured to project outward so as to at least partially dig an inner circumferential surface of the intermediate portion 211a of the expanded portion 211 during the swaging.

The ring outer protrusions 173 and 174 may include an outer sealing protrusion that seals between the expanding pipe 210 and the sealing ring 17 and resists axial force acting on the expanding pipe 210.

For example, referring to Fig. 8, the outer sealing protrusion may be provided with an annular structure (see reference numeral 173 in Fig. 8) extending continuously along the circumferential direction. Also, a plurality of outer sealing-type protrusions may be provided at intervals along the longitudinal direction. In addition, the outer sealing-like protrusion may be formed by a sealing ring (not shown) such that when the defect is present on the inner circumferential surface of the bellows pipe 210, the grids adjacent to the defect form a closed space in the local region and resist resistance against torsion 17, which are repeatedly arranged along the circumferential direction.

In addition, the ring outer projections 173, 174 may include an outer torsion-resistant protrusion that resists against the torsion acting on the tube 210.

For example, referring to reference numeral 174 in FIG. 8, the outer torsion-resistant protrusion may have a nulling shape (spline). In other words, the outer torsion-resistant protruding portion has a shape in which a longitudinally elongated tooth shape (continuously extending in the longitudinal direction) is repeatedly arranged along the circumferential direction on the outer periphery of the sealing ring 17 Shape). 8, the outer torsion-resistant protrusions may be applied in combination with the above-described outer sealing-type protrusions.

In another example, the ring outer projections 173 and 174 may be formed in an annular shape having an oblique slope, or may be formed as a grid-like projection as described above, thereby performing both the outer sealing projection and the outer torsion-resistant projection As shown in FIG. Thus, the ring outer projections 173 and 174 can be provided in various forms considering sealing, axial force resistance, torsional resistance, and the like, and for the provision of the sealing ring 17 having such ring outer projections 173 and 174 A variety of processing methods including rolling may be applied or combined.

The maximum thickness of the sealing ring 17 may be larger than half the value obtained by subtracting the outer diameter of the connection target pipe 220 from the inner diameter of the expansion pipe 211 after the swaging. In other words, the maximum thickness of the sealing ring 17 may be larger than a value obtained by subtracting the outer radius after the swaging deformation of the connection target pipe 220 from the inner radius after the swaging deformation of the expansion portion 211. That is, the maximum thickness of the sealing ring 17 can be set to be larger than the size of the space between the inner periphery of the post-deformation expanded portion 211 by the swaging and the outer periphery of the connection target pipe 220. 8, the maximum thickness of the sealing ring 17 may mean the maximum thickness between the ring inner protrusions 171, 172 and the ring outer protrusions 173, 174. Accordingly, the sealing ring 17, which is set to a thickness larger than the size (width) of the interposed space, is closely adhered to each other through the plastic deformation between the expansion pipe 211 and the connection target pipe 220 during swaging, Can be exercised.

The sealing ring 17 is formed on the inner circumferential surface of the expanded portion 211 in the space between the expanded portion 211 and the connected target pipe 220 in the process of plastic deformation of the expanded portion 211, (Sealing) structure while piercing the pipe 220 to be connected to the connection pipe 220, and at the same time, it is permanently disposed between the pipe portion 211 and the pipe 220 to be connected.

Further, the sealing ring 17 can be manufactured to have a relatively high hardness (surface hardness) than the material of the pipe 210 and the pipe 220 to be connected. The sealing ring 17 can be made of a material having a corrosion resistance comparable to that of the expanding pipe 210 and the pipe 220 to be connected. Alternatively, the sealing ring 17 may be made of the same material as the expanding pipe 210 and the connection target pipe 220, but may be made of a material having a relatively higher relative quality than the materials of the expanding pipe 210 and the connecting pipe 220 through heat treatment or special surface treatment. (Surface hardness).

Accordingly, the sealing ring 17 pierces the outer circumferential surface of the expanding pipe 210 and the inner circumferential surface of the connection target pipe 220 to a negligible depth to secure an excellent sealing ability, and at the same time, External force (external force by a fastening tool to be described later) can be reduced. That is, the sealing ring 17 is formed so that it can be pierced at a depth deeper than the depth of the surface defect existing in the outer peripheral surface of the pipe 210 and the inner peripheral surface of the pipe 220 to be connected The material having a surface hardness relatively higher than the material of the pipe 210, the pipe 210 to be connected and the pipe 220 to be connected and an inner and outer projecting amount larger than the depth of the expected surface defect. The protruding configuration of the ring inner projecting portions 171 and 172 and the ring outer projecting portions 173 and 174 of the sealing ring 17 may be a protruding configuration of a sharp protruding shape (for example, tip end) As shown in FIG.

For reference, the description of the ring inner projections 171 and 172 of the sealing ring 17 may be applied equally or similarly to applicable ones of the inner projections 2111a described above.

8, a sealing ring 17 is provided between the rear end of the sealing ring 17 and the change section 2112, and between the front end of the sealing ring 17 and the end of the front unreached portion 211c, A stopper ring 19 may be disposed to guide the intermediate portion 211a in a position corresponding to the intermediate portion 211a. 6) and the position corresponding to the front unreachable portion 211c (the right partial enlarged view of FIG. 6), the stopper ring 19 is located at a position corresponding to the rearward introducing portion 211b (Refer to FIG. Further, the sealing ring 17 may be provided in a form (standard) capable of being disposed between these stopper rings 19. [ Further, the stopper rings 19 disposed on both sides of the front and rear sides may be provided to be relatively thicker than the thickness of the sealing ring 17 (the thickness between the ring inner projecting portion and the ring outer projecting portion). For reference, the middle portion 211a, the rear introduction portion 211b, and the front unreached portion 211c can be understood in consideration of the contents shown in the first half of the drawings and the description of the entire specification in this connection.

Accordingly, when the swage ring 15 is moved to the intermediate portion 211a and swaging is performed with respect to the intermediate portion 211a in the step S300 to be described later, the rearward introduction portion 211b and the frontwardly unreachable portion 211c, Since the stopper ring 19 disposed in each of them has a relatively thicker thickness than the sealing ring 17, the rearward introduction portion 211b and the frontward unreachable portion 211c are relatively larger in outer diameter than the middle portion 211a And to make a significant contribution to being saved. In other words, selective swaging for the intermediate portion 211a of the swage ring 15 and setting of the thickness of the stopper ring 19 disposed in each of the rearward introduction portion 211b and the front unreached portion 211c are organic It is possible to maximize the role of the limiting jaws of each of the rear introduction portion 211b and the front non-reaching portion 211c.

Meanwhile, the present pipe connecting method includes a step (S200) of inserting the rear end of the pipe 220 to be connected in the pipe expanding portion 211. 3 shows that the swage ring 15 is connected to the expansion part 211 through step S300 to be described later in a state where the rear end of the connection target pipe 220 is inserted into the expansion part 211 by performing step S200 Fig.

3, the present pipe connecting method includes disposing a fastening tool 2 for towing a swage ring 15 disposed to surround the outer periphery of an expanded pipe 210 at the rear of the expanded portion 211, And moving the ring 15 forward (S300).

The swage ring 15 may be disposed in advance to surround the outer circumference of the pipe 210 at a position behind the position at which the pipe portion 211 is to be formed before the step S300. By way of example, the arrangement of the swaging ring 15 can be made before the step S100 before the expanding pipe 210 is expanded, but it is not limited thereto and can be performed at various times as required. As another example, the swage ring 15 is introduced between the steps S100 and S300 through the rear end of the expanding pipe 210 so as to surround the outer periphery of the expanding pipe 210, And may be arranged around the outer periphery of the expansion pipe 210 at the rear of the expected formation position.

3 and 6, in the above-described step S300, the rear introduction portion 211b and the swage ring 15, which are in contact with each other only at the time of introduction of the swage ring 15 in the expansion portion 211, The swaging ring 15 is moved so that the swaging ring 15 is contacted and pressed against the intermediate portion 211a excluding the front unreached portion 211c which is not in contact with the intermediate portion 211a.

The initial inner diameter before swaging (the maximum inner diameter before swaging of the swage ring 15) of the swage ring 15 is set to be smaller than the initial outer diameter before swaging of the expansion section 2111 (particularly, the middle portion 211a) . According to this setting, in accordance with the forward movement of the swaging ring 15, the expansion portion 211 of the expansion pipe 210 can be swaged at S300.

Illustratively, referring to FIG. 6, the middle portion 211a of the widening section 2111 may be deformed in a direction in which the outer diameter is reduced by swaging in step S300. At least a part of the inner circumferential surface of the intermediate portion 211a is brought into contact with the outer circumferential surface of the rear end portion of the connecting pipe 220 by the swaging of the swage ring 15 which deforms the intermediate portion 211a in the direction in which the outer diameter is reduced, It is possible to pressurize. According to this swaging deformation, the middle portion 211a can have an outer diameter smaller than that of the rear introduction portion 211b and the front unreached portion 211c. That is, the rearward-insertion portion 211b and the front-unreached portion 211c may have a larger outer diameter than the middle portion 211a.

Specifically, the rear introduction portion 211b is deformed in the direction in which the outer diameter is reduced by the swaging, and at least a part of the rear introduction portion 211b is elastically deformed after passing through the swage ring 15, 15, it can be deformed in a direction in which the outer diameter is relatively larger than that of the intermediate portion 211a. When the swage ring 15 having an inner diameter smaller than the outer diameter of the rear introduction portion 211b is moved forward while pressing the outer peripheral surface (surface) of the rear introduction portion 211b under a predetermined pressure, A pulling force for pulling the outer peripheral surface forward can be applied to the outer peripheral surface (surface) side of the swage ring 211b by the frictional force with the inner peripheral surface of the swage ring 15, and the pull- A predetermined deformation (lifting up) in the direction of the sheet can be made. The rearward introduction portion 211b can be made relatively larger in outer diameter than the swaged-deformed intermediate portion 211a by one or more of the above-mentioned two actions. The thickness and the material of the rear introduction portion 211b are at least partially deformed or recovered after passing the swage ring 15 or the outer circumferential surface side is pulled at least partially forward in accordance with the movement of the swage ring 15, It is preferable that the outer diameter is set in a direction in which the outer diameter can be relatively larger than that of the outer diameter portion 211a.

As described above, the rear introduction portion 211b can prevent the backward departure of the swage ring 15 by an outer diameter relatively larger than the intermediate portion 211a. On the other hand, the front unreachable portion 211c can naturally have a relatively large outer diameter as compared with the middle portion 211a since the swage ring 15 presses only the middle portion 211a. That is, the rearward introduction portion 211b and the frontwardly unreachable portion 211c can prevent the backward departure and the forward departure of the swage ring 211 through an outer diameter relatively larger than the intermediate portion 211a after the swaging . Each of the rearward introduction portion 211b and the frontwardly unreachable portion 211c may serve as a limiting limiter that restricts the swing ring 15 from moving forward and backward after step S300.

Unlike the intermediate portion 211a, the inner depression and the inner protrusion 2111a are not formed in the rearward introduction portion 211b and the frontwardly unreachable portion 211c as described above, The average thickness or the minimum thickness (the thickness between the outer surface and the inner depression in the case of the middle portion 211a) is relatively large. In view of this thickness, the rear introduction portion 211b and the front unreachable portion 211c are formed so that the outer diameter of the swage ring 15 becomes larger than that of the middle portion 211a after the swaging, It is possible to serve as a restricting jig for preventing dislocation to the front or rear.

The initial thickness before swaging of the swaging ring 15 is larger than the initial thickness before swaging of the intermediate portion 211a so that the intermediate portion 211a at the time of swaging has a greater deformation amount than the swaging ring 15 .

The thickness and the material of the swaging ring 15 are such that deformation of the swaging seesaw ring 15 is mainly (mostly) in the elastic region and at least part of the deformation of the intermediate portion 211a is in the plastic region Can be set.

For example, if the material of the swage ring 15 and the pipe 210 is the same, if the swage ring 15 is set to be significantly thicker than the middle portion 211a of the pipe 210, The amount of deformation of the swaging seesaw ring 15 of the intermediate portion 21 can be much smaller than the deformation amount of the intermediate portion 211a. For such a small amount of deformation, the deformation in the elastic region can be made, so that the swage ring 15 can be elastically deformed. On the other hand, the intermediate portion 211a of the expanding pipe 210 having a deformation amount relatively larger than the deformation amount of the swaging ring 15 may be subjected to plastic deformation at least a part of which deviates from the elastic region. If plastic deformation of the middle portion 211a of the pipe 210 is induced by such thickness and material setting, the airtightness and fixability between the pipe 210 and the pipe 220 can be secured with higher performance . The thickness of the swage ring 15 is preferably set to be equal to or greater than the sum of the thickness of the expanding pipe 210 and the thickness of the pipe 220 to be connected.

In step S300, the inner protruding portion 2111a formed on the inner peripheral surface of the intermediate portion 211a can be deformed at least partially by pressing the outer peripheral surface of the pipe 220 to be connected. Also, the connection target pipe 220 can be deformed by the pressing of the inner projecting portion 2111a. Accordingly, the inner protruding portion 2111a can be coupled to the connection target pipe 220 in a form of piercing the outer peripheral surface of the connection target pipe 220. In the case of the sealing protrusion described above, when the swage of the swage ring 15 is fastened in the form of piercing the outer circumferential surface of the connection target pipe 220, the airtightness between the expansion pipe 210 and the connection target pipe 220 becomes more hermetic Can be sealed.

In addition, the sealing protruding portion, which is a lattice-like protrusion, has a structure in which, when there is a defect on the surface of the pipe 220 to be connected, neighboring (adjacent) lattices of the defect portion form a closed (closed) space of the local region, It is possible to prevent the torsion of the light emitting diode 220. Specifically, when the sealing protrusions are provided in the form of a lattice, each lattice acts as a kind of partition wall separating the region inside the lattice from the region outside the lattice, which is advantageous in that the leakage preventing ability can be expected to be higher. That is, when the sealing is performed in the form of a lattice, the leakage from the defect portion can be restricted only within a predetermined lattice region and further leakage outside the lattice region concerned can be blocked. In addition, the lattice shape can also serve to resist the torsion applied to the pipe as well as to resist the axial force applied to the pipe in its structure.

In addition, the torsion-resistant protrusion can contact or press the connection target pipe 220 in step S300. With this torsion-resistant protruding portion, an effective resistance structure can be provided against the bending deformation moment applied to the pipe.

Further, when the torsion-resistant protrusion is formed in an annular shape having an oblique slope or is formed as a lattice-like protrusion, the role of the sealing-type protrusion and the torsion-resistant protrusion (sealing role, resistance to axial external force component, Resistance to components, etc.) can be performed.

For reference, the fastening tool 2 disposed in the step S300 is brought into contact with the rear end surface of the swage ring 15 (see Fig. 3), or is brought into contact with the outer circumferential surface of the swage ring 15 Unit 21 and a front support unit 22 that contacts the front end surface of the expansion pipe 210. [ 7, by way of example, when the traction unit 21 contacts the outer circumferential surface of the swage ring 15, the outer circumferential surface of the swage ring 15 is provided with a depression 152 May be formed.

The tightening tool 2 also includes a drive unit that provides an axial compression force by a driving force and a driving force that relatively move the traction unit 21 toward the front support unit 22 side so that the swage ring 15 is pulled . For example, the drive unit can relatively pull the traction unit 21 relative to the front support unit 22 to move them closer to each other. Since various driving devices such as a driving unit (actuator) using hydraulic pressure may be applied to such a driving unit, a more detailed description will be omitted.

A rounded portion 151 having a convex curved surface may be formed under the front end of the swage ring 15. The introduction of the swage ring 15 to the rear introduction portion 211b by the round processing portion 151 can be smoothly and easily performed. 6, a part of the outer circumferential surface of the front unreachable portion 211c may be provided in such a form that the outer diameter gradually increases in a state of being in contact with the round processing portion 151 by the round processing portion 151, Accordingly, the frictional resistance due to the contact can be organically combined in the role of the limiting jaw of the forwardly unreachable portion 211c.

The round processing portion 151 of the swage ring 15 is moved in the direction in which the rearward introduction portion 211b of the expanded portion 211 is pulled out It is preferable that the degree of such expansion deformation is made in the elastic region of the swaging ring 15. [ This expansion causes the truncated truncated conformation to gently contact the inclined outer surface (transition section 2112) of the tube section 211 so that the introduction for the forward traction of the swage ring 15 is less friction It can be guided to be smoothly carried with the resistance.

6, a rear end round portion having a convex curved surface similar to the round processing portion 151 (front end round processing portion) may be formed on the lower side of the rear end of the swage ring 15. By this rear end round processing unit, the shape of the restriction jaw of the rear introduction portion 211b that protrudes outward relative to the intermediate portion 211a can be more effectively formed. Specifically, part of the outer circumferential surface of the rear introduction portion 211b may be provided in such a shape that the outer diameter gradually increases in a state of being in contact with the rear end round processing portion. Thus, in the role of the restriction jaw of the rear introduction portion 211b, Friction resistance due to contact can be organically combined.

In addition, the present pipe connecting method includes a step of removing the fastening tool 2.

As described above, in the pipe connecting method, the front side of the expanded pipe 210, into which the swage ring 15 is inserted in advance, is expanded by the rolling process, which is one type of plastic working, May be inserted into the expansion portion 211 and then provided with a permanent pipe connection which pressurizes and connects the swage ring 15 to the swage ring 15. [ In addition, the pipe connection method can be extended to various types of pipe connection fittings, such as a bent pipe or a T-shaped accessory.

In addition, according to the above description, the present piping connection method can be applied to a single swage (swage pipe) to two pipes (the pipe 210 and the pipe 220 to be connected) cut in consideration of the overlapped length of the pipes- ) Ring 15 as shown in Fig.

In addition, the present pipe connection method can optionally use an insert for structural reinforcement (for example, when applied to a flexible pipe such as copper (Cu)). For reference, the insert is disposed inside the connection target pipe 220 and supports the connection target pipe 220 in the radial direction, and may be provided in a ring shape, for example. An outer protrusion that contacts the inner circumferential surface of the connection target pipe 220 when swaging the swage ring 15 may be formed on the outer circumferential surface of the insert. The outer projecting portion may be formed at a position corresponding to the longitudinal direction (longitudinal direction) of the pipe and the inner projecting portion 2111a of the above-described pipe 210. [ For example, when one of the plurality of inner protruding portions 2111a is deformed by swaging of the swage ring 15 to press the outer peripheral surface of the middle portion 211a of the expanding pipe 210, May be configured to support the pipe against the pressure at a position corresponding to any one of the inner projections of the inner peripheral surface of the connection target pipe 220. [ The outer projecting portion is formed continuously (for example, in an annular shape) along the periphery to support the connection target pipe 220, so that the connection target pipe 220 and the insert can be sealed.

The joint of the pipe 210 and the pipe 220 to be connected is connected to the swaged ring 15 inserted before the pipe 210 is expanded, To the intermediate portion 211a of the bulging portion 211. As shown in Fig.

In addition, according to the above description, the present pipe connecting method can have the advantage of forming the tube portion 211 without additional raw material, while having the advantages of the swaged type connection. Accordingly, the present pipe connecting method can ultimately have an advantage that the connection portion of the same performance can be formed with a considerably small material and weight.

In addition, according to the above description, the inner projecting portion 2111a is subjected to work hardening (occurs) due to the influence of the cold plastic working during the rolling process of the expanding portion 211, And the connection target pipe 220 may be provided with protrusions having a stiffer strength. Accordingly, the inner protrusion 2111a in the swaging process can more easily dig an outer circumferential surface of the pipe 220 to be connected, thereby providing a more robust and reliable sealing force.

Further, according to the above description, the present pipe connecting method is advantageous in that the swaging ring 15 satisfies all of the required functional properties thereof, but also has a very simple shape and a minimum length necessary to cover a part of the bending portion 211 , And can be provided with very low cost.

Hereinafter, a pipe connecting apparatus (hereinafter referred to as a "main pipe connecting apparatus") according to an embodiment of the present invention will be described. However, the pipe connecting device shares the same or corresponding technical features and configuration as the above-described pipe connecting method. Therefore, the description overlapping with the contents described in connection with the present pipe connection method will be simplified or omitted, and the same reference numerals will be used for the same or similar components.

The present pipe connecting device includes an expanding pipe (210). An expanding portion 211 is formed on the front side of the expanding pipe 210. The expanding section 211 includes a change section 2112 for connecting the expansion section 2111 and the expansion section 2111 with the unfolded general section. In addition, the rear end of the connection target pipe 220 is inserted into the expansion portion 211.

In addition, the present pipe connecting device includes a swage ring 15 that surrounds and exposes the shunt section 2111. The contact and the pressurization of the swage ring 15 are carried out in such a manner that the backward introduction portion 211b which is contacted only at the time of introducing the swage ring 15 in the expansion portion 211 and the backward introduction portion 211b which is in contact with the swage ring 15 And the intermediate portion 211a except for the portion 211c.

The initial inner diameter before swaging of the swaging ring 15 is smaller than the initial outer diameter before swaging of the swelling section 2111. The rearward introduction portion 211b and the frontwardly unreachable portion 211c have outer diameters relatively larger than the middle portion 211a by swaging of the swage ring 15 that deforms the intermediate portion 211a in the direction in which the outer diameter is reduced Can be large. The rearward introducing portion 211b and the front unreachable portion 211c can prevent the backward departure and forward departure of the swage ring 15 by an outer diameter relatively larger than the intermediate portion 211a after the swaging.

The initial thickness before swaging of the swaging ring 15 may be greater than the initial thickness before swaging of the middle portion 211a so that the intermediate portion 211a at the time of swaging has a larger deformation amount than the swaging ring 15 . The thickness and the material of the swaging ring 15 are such that the deformation of the swaging seesaw ring 15 is made in the elastic region and at least a part of the deformation of the intermediate portion 211a can be made in the firing region, Lt; / RTI >

The thickness and the material of the rear introduction portion 211b are at least partially deformed or recovered after passing the swage ring 15 or the outer circumferential surface side is pulled at least partially forward in accordance with the movement of the swage ring 15, Can be set to a thickness and a material that can have an outer diameter relatively larger than that of the outer surface 211a. As described above, the rearward introduction portion 211b can prevent the backward departure of the swage ring 15 by an outer diameter relatively larger than the intermediate portion 211a.

A rounded portion 151 having a convex curved surface may be formed under the front end of the swage ring 15. The maximum inner diameter before swaging of the round processing section 151 may be larger than the initial outer diameter before swaging of the expansion section 2111. [ With this maximum inner diameter setting, the introduction of the swaging ring 15 can be made smoother.

An inner protruding portion 2111a which is in contact with the connection target pipe 220 at the time of swaging may be formed on the inner peripheral surface of the intermediate portion 211a. The inner projecting portion 2111a is integrally formed with the same material as the other portions of the expanding pipe 210 (the portion other than the inner projecting portion 2111a of the expanding pipe 210, for example, the adjacent portion of the inner projecting portion 2111a) And may be a strain hardening portion having a higher hardness than the other portions of the pipe 210. Such a strain hardening portion can be formed by work hardening by cold plastic working. Also, the expanding portion 211 may be formed by a roll forming method.

A sealing ring 17 interposed between the intermediate portion 211a and the connection target pipe 220 may be disposed inside the intermediate portion 211a. The sealing ring 17 may have ring inner protrusions 171, 172 and ring outer protrusions 173, 174. The ring inner protrusions 171 and 172 protrude inwardly so as to at least partially dig an outer peripheral surface of the pipe 220 to be connected at the time of swaging. Further, the ring outer projecting portions 173 and 174 are configured to project outward so as to at least partially dig an inner peripheral surface of the intermediate portion 211a at the time of swaging. At this time, the end of the front unreached portion 211c may be set to have an inner diameter smaller than the outer diameter of the sealing ring 17 so as to prevent the forward disengagement of the sealing ring 17.

A sealing ring 17 is provided between the rear end of the sealing ring 17 and the change section 2112 and between the front end of the sealing ring 17 and the end of the front unreached portion 211c, And a stopper ring 19 for guiding a corresponding position.

In addition, the pipe connecting device may include a pipe 220 to be connected. In addition, the present pipe connecting device may include an insert disposed inside the connected pipe 220 to support the pipe, if necessary.

It will be understood by those of ordinary skill in the art that the foregoing description of the embodiments is for illustrative purposes and that those skilled in the art can easily modify the invention without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

210: pipe for expansion
211:
2111: Extension section
2112: Change interval
2111a: inner protrusion
211a: middle portion
211b:
211c: front unreachable portion
220: Connection target pipe
2: Fastening tool
21: Towing unit
22: front support unit
15: Sweezy ring
151: Round processing unit
152: depression
17: Sealing ring
171, 172: ring inner protrusion
173, 174: ring outer protrusion
19: Stopper ring
91: outer body
92: roller dice

Claims (17)

In the pipe connecting method,
(a) inserting a rear end portion of a pipe to be connected into an expansion portion formed to include an expansion section on the front side of the expansion pipe and a change section connecting the expansion section with the unfolded general section;
(b) disposing a fastening tool for retracting the swaged ring disposed to surround the outer periphery of the expanding pipe at the rear of the expanded portion to move the swaged ring forward; And
(c) removing the fastening tool,
Wherein the step (b) includes the steps of: (a) contacting the swaging ring with the sweep ring; Moving the swage ring so that pressurization is performed,
Wherein the initial inner diameter before swaging of the swaging ring in the step (b) is smaller than the initial outer diameter before swaging of the sweeping interval. The method according to claim 1,
Further comprising the step of: (d) forming the expansion portion in the expansion pipe by a rolling method before the step (a). 3. The method of claim 2,
Wherein in the step (d), the front side of the expanding pipe is interposed between an outer body formed with a hole having an inner diameter corresponding to the outer diameter of the expanding section, and a roller dice disposed inside the hole. The method of claim 3,
Wherein the roller dice has an outer shape corresponding to the inner protrusion so that an inner protrusion is formed on an inner circumferential surface of the intermediate portion. 3. The method of claim 2,
In the step (d), after the expansion pipe is expanded, a sealing ring is inserted into the inside of the expansion portion corresponding to the intermediate portion, and then the end of the front unreached portion prevents the sealing ring from being forwardly released The inner diameter of which is reduced. In the pipe connecting device,
An expansion pipe having an expansion section and a expansion section including a change section connecting the expansion section with the unfolded general section, the expansion pipe having a rear end of the connection target pipe inserted into the expansion section; And
And a swaging ring surrounding and urging the expanding section,
The contact and the pressurization of the swage ring are made with respect to an intermediate portion except for a rear introduction portion which is contacted only at the time of introduction of the swage ring and a forward unreached portion at which the swage ring is not contacted,
Wherein the initial inner diameter before swaging of the swaging ring is smaller than the initial outer diameter before swaging of the sweeping ring. The method according to claim 6,
Wherein the rearward introduction portion and the frontwardly unreached portion have a larger outer diameter than the middle portion by swaging of the swage ring that deforms the intermediate portion in the direction in which the outer diameter is reduced. 8. The method of claim 7,
Wherein the rearwardly introduced portion and the non-frontwardly-arriving portion prevent the rearward departure and forward departure of the swage ring by an outer diameter relatively larger than the intermediate portion after swaging. The method according to claim 6,
Wherein the pre-swaging initial thickness of the swaging ring is greater than the pre-swaging initial thickness of the intermediate portion such that the intermediate portion has a greater deformation amount during swaging than the swaging ring. 10. The method of claim 9,
Wherein the thickness and material of the swaging ring is set to a thickness and a material such that deformation of the swaging ring in the swaging zone is made in the elastic region and at least a part of the deformation of the intermediate section is made in the firing zone. Pipe connection. The method according to claim 6,
The thickness and the material of the rearward introduction portion are at least partially deformed or recovered after passing the swaging ring or the outer circumferential surface side thereof is pulled at least partially forward in accordance with the movement of the swage ring, Is set to a thickness and a material which can be increased,
Wherein the rearward introduction portion prevents backward deviation of the swage ring by an outer diameter relatively larger than the middle portion. The method according to claim 6,
A rounded portion of a convex curved surface is formed below the front end of the swage ring,
And the maximum inner diameter before swaging of the round processing section is larger than the initial outer diameter before swaging of the expansion section. The method according to claim 6,
An inner projecting portion contacting the pipe to be connected upon swaging is formed on the inner peripheral surface of the intermediate portion,
Wherein the inner protrusion is integrally formed of the same material as the other portions of the pipe, and is a strain hardening portion having a higher hardness than the other portions of the pipe. 14. The method of claim 13,
Wherein the strain hardening portion is formed by work hardening by cold plastic working. The method according to claim 6,
And a sealing ring disposed between the intermediate portion and the connection target pipe is disposed inside the intermediate portion, the sealing ring having a ring inner projection and a ring outer projection,
The ring inner protrusion is inwardly protruded so as to at least partially dig an outer circumferential surface of the connection target pipe at the time of swaging,
Wherein said ring outer projection is outwardly protruded to at least partially dig an inner circumferential surface of said intermediate portion upon swaging. 16. The method of claim 15,
And an end of the front unreached portion has an inner diameter smaller than an outer diameter of the sealing ring so as to prevent the forward disengagement of the sealing ring. 16. The method of claim 15,
Wherein a stopper ring is arranged in each of a space between the rear end of the sealing ring and the change section and between the front end of the sealing ring and the end of the front unreached portion so that the sealing ring is positioned corresponding to the middle portion. Pipe connection.

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