KR20190138217A - Metal pipe with socket and pipe connection structure using the same - Google Patents

Abstract

The present invention provides a metal tube in which a socket ring is joined with excellent strength by a non-welding method. The metal tube comprises: a first tube of metal provided with a socket main body having a socket body; and a socket ring bonded to the socket body by having a compression hole adhered to the outer circumferential surface of the socket body and a spike protruding from the inner circumferential surface of the compression hole and embedded in the outer circumference of the socket body. In addition, the present invention provides a structurally stable tube connection structure by using such a metal tube.

Description

Metal pipe with socket and pipe connection structure using same {METAL PIPE WITH SOCKET AND PIPE CONNECTION STRUCTURE USING THE SAME}

Embodiment of the present invention relates to a metal tube having a socket used for connecting the pipe and a pipe connection structure using the same.

In general, a tube made of a metal material, such as a steel pipe, which is manufactured in a mold using a mold, is disadvantageous in terms of manufacturability and economical efficiency, because it is difficult to form a socket for the interconnection at an end in a complicated shape. As a rule, the mechanical joint method is not available. And, according to this, even though the tube of the metal material such as steel pipe has excellent properties compared to the tube made of other materials (cast iron pipe, synthetic resin pipe, etc.) is not widely spread.

Korean Patent Publication No. 10-1037586 discloses a prior art for solving such a problem. In the prior art, a socket body is provided at an end of a first tube of two tubes to be connected to each other, an end of a second tube of two tubes to be connected to each other is inserted into an inside of the socket body, and a socket ring is formed at an outer circumference of the socket body. ), A sealing member is interposed between the socket body and the second pipe, a pressure wheel is mounted to the second pipe, and the pressure wheel and the socket ring are accessed by the pipe fastening mechanism, While the two pipes are bound together, the sealing member is kept airtight.

Such a prior art can provide a socket by a socket body and a socket ring, and thus can connect a metal tube such as a steel pipe by a mechanical joint method, but the socket ring is simply fitted to the outer circumference of the socket body. In addition, since the socket ring is not fixed to the socket body, the stability of the pipe connection may be drastically deteriorated due to the phenomenon in which the socket ring is disposed at an inappropriate position after the pipe connection or the socket ring is moved by an external force.

Republic of Korea Patent Publication No. 1992-0008570 (1992.10.01.) Republic of Korea Patent Publication No. 10-1037586 (2011.05.27.) Republic of Korea Patent Publication No. 10-1780411 (October 10, 2017)

Embodiments of the present invention are to provide a metal tube and a pipe connection structure that is structurally stable by using the metal tube, the socket ring is bonded to the excellent strength by a non-welding method to the socket body of the tube.

In addition, an embodiment of the present invention is to provide a metal pipe and a pipe connection structure using the same that can be quickly and easily joined pipe and the socket ring in a simple process.

In addition, an embodiment of the present invention is to provide a more advantageous metal tube and pipe connection structure using the same in terms of preventing separation of the pipe and the socket ring joined to each other.

The problem to be solved is not limited thereto, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

According to an embodiment of the invention, the first tube made of a metal material; A socket ring disposed on an outer periphery of at least one end of the first tube, the first tube having an inner diameter greater than an outer diameter of the second tube so that a second tube can be inserted into at least one end; A socket body having a socket body is provided, and the socket ring protrudes from an inner circumferential surface of the pressing hole and an inner circumferential surface of the socket body in close contact with the outer circumferential surface of the socket body, and at least one spike embedded in the outer circumference of the socket body. There may be provided a metal tube having a socket, which is attached to the socket body.

Here, the socket body may be provided with a main portion of the shape corresponding to the spike as the spike is embedded in the outer peripheral surface.

In addition, a hooking portion may be provided in a circumferential region of the crimping hole in the socket ring to catch a tube fastening mechanism of a binding means for engaging the first tube with the second tube.

In addition, the spike may be formed in a closed ring shape along the inner circumferential surface of the pressing hole.

In addition, the socket body may have a socket end extending in a taper shape extending outward from the tip of the socket body to form a sealing space between the second pipe. The socket ring may have a tapered surface corresponding to an outer circumferential surface of the socket end.

According to an embodiment of the invention, the first tube made of a metal material; A socket ring disposed on an outer periphery of at least one end of the first tube, the first tube having an inner diameter greater than an outer diameter of the second tube so that a second tube can be inserted into at least one end; And a socket body having a socket body, the socket ring having a crimping hole in which an inner circumferential surface is in close contact with an outer circumferential surface of the socket body and at least one spike protruding from the inner circumferential surface of the crimping hole to be embedded in the outer circumference of the socket body. The socket body may be provided with a taper for expanding the outer circumference toward the front end, and a taper corresponding to the taper of the socket body may be provided on the inner circumferential surface of the crimping hole.

According to an embodiment of the invention, the first tube made of a metal material; And a socket ring of a metal material disposed on an outer periphery of at least one end of the first tube, wherein the first tube has an inner diameter larger than that of the second tube so that a second tube can be inserted into at least one end thereof. A socket body having a large socket body is provided with expansion pipe processing, and the socket ring protrudes from the inner circumferential surface of the crimping hole and the at least one spike is projected from the inner circumferential surface of the crimping hole. Is provided with a socket, the socket body is provided with a metal tube with a socket, the socket body is provided with a recessed recessed portion of the inner circumferential surface of the pressing hole is in close contact with the outer peripheral surface by the expansion pipe processing; have. At this time, the engaging portion may be provided in the peripheral region of the crimping hole in the socket ring to catch the tube fastening mechanism of the fastening means for engaging the first tube with the second tube.

The expansion pipe forming the socket body by placing the socket ring on the outer periphery of the end (hereinafter referred to as a portion to be expanded) in the first pipe to form the socket body and inserting the expansion pipe mold into the portion to be expanded. can do.

Here, the socket body has a socket end extending in a tapered shape extending outward from the tip of the socket body to form a sealing space between the second pipe, the socket ring corresponds to the outer peripheral surface of the socket end It has a tapered surface, the socket end may be formed so that the outer peripheral surface corresponding to the tapered surface by the expansion pipe processing.

In addition, the socket body may be enlarged so that the cross-sectional size is constant or increased toward the tip by the expansion pipe processing.

According to an embodiment of the invention, the first tube made of a metal material; A socket ring disposed on an outer circumference of at least one end of the first pipe; And an opening / closing unit having a valve function for opening and closing a pipe of the first pipe or a filter having a filtration function for the fluid flowing along the pipe of the first pipe, wherein the first pipe includes at least A socket body having a socket body having an inner diameter larger than an outer diameter of the second tube is provided so that a second tube can be inserted at either end, and the socket ring has a compression hole in which an inner circumferential surface is in close contact with the outer circumferential surface of the socket body. A metal tube with a socket may be provided, which is attached to the socket body with at least one spike protruding from the inner circumferential surface of the pressing hole and embedded in the outer circumference of the socket body. At this time, the outer circumferential surface of the socket body is provided with a recessed portion corresponding to the spike as the spike is embedded, and in the peripheral region of the crimp hole in the socket ring to bind the first tube and the second tube. A locking portion may be provided to catch the pipe fastening mechanism of the binding means.

According to an embodiment of the present invention, there is provided an apparatus comprising: a first tube of metal provided with at least one end of a socket body having a socket body and a socket end extending in a tapered shape outwardly from a tip of the socket body; A second tube having one end inserted into the socket body; Disposed on an outer circumference of the socket body, the outer circumferential surface of the socket body has a compression hole in close contact with the inner circumference of the compression hole, and has at least one spike embedded in the outer circumference of the socket body and joined to the socket body; A socket ring having a tapered surface corresponding to an outer circumferential surface of the socket end; A sealing member inserted into a sealing space between the socket end and the second pipe; A pressure wheel mounted on an outer circumference of the second pipe and having a pressing surface for pressing the sealing member in the sealing space; And a pipe fastening mechanism for accessing the socket ring and the pressure wheel by tightening the bolt while the sealing member is caught by the locking portion of the socket ring and the locking portion of the pressure ring such that the sealing member is pressed by the pressing surface. Can be provided.

Means for solving the problems will become more specific and clear through the embodiments, drawings, and the like described below. In addition, in the following, various solutions other than the above-mentioned solutions may be further presented.

According to an embodiment of the present invention, a socket body having a socket body is provided at at least one end of a metal tube, and the socket ring constituting the socket together with the socket body has a crimping hole and a spike, and the crimping hole is a socket body. Since the spikes protrude from the inner circumferential surface of the crimping hole and are embedded in the outer circumference of the socket body, it is possible to provide the socket body with a metal tube in which the socket ring is firmly joined in an integrated structure.

Further, according to this, it is possible to join the socket ring in a non-welding manner to a metallic material pipe (for example, a steel pipe, etc.), which is difficult or difficult to directly form a socket having a complicated shape directly at the end according to the material characteristics. In addition, according to the socket ring connection, even in the case of steel pipes can be stably interconnected by a mechanical joint method instead of a welded joint, it can be economically connected to steel pipes of various sizes and shapes without damage to the inner and outer coatings In addition, the reliability of the pipe connection structure can be greatly improved.

According to the embodiment of the present invention, since the spike is formed into a closed ring shape and is totally embedded in the pipe, it is possible to ensure an improved bond strength with respect to the joint of the pipe and the socket ring.

According to an embodiment of the present invention, since the socket body includes a socket end formed in a tapered shape that extends outwardly at the tip of the socket body, and the socket ring has a tapered surface corresponding to the outer circumferential surface of the socket end, Since the detachment of the socket ring is prevented again by the locking action between the socket end and the socket ring, the joint state of the pipe and the socket ring can be more stably maintained.

Further, according to the embodiment of the present invention, since the taper is formed in the socket body to gradually enlarge the outer circumference of the socket body toward the tip end, and the taper of the shape corresponding to the taper of the socket body is formed on the inner circumferential surface of the crimping hole, It can strongly prevent separation of the pipe and the socket ring joined together.

According to an embodiment of the present invention, after arranging a socket ring in an outer peripheral region of at least one end of a metal material pipe, the end of the pipe is press-fitted into the expansion pipe, and the socket body having an enlarged shape at the corresponding end of the pipe is formed. The socket body is formed, the outer circumferential surface of the socket body is brought into close contact with the inner circumferential surface of the crimping hole, and spikes are formed on the outer circumferential surface of the socket body, so that the pipe and the socket ring can be joined in a simple process. Bonding strength to the joint of the socket ring can be significantly improved.

1 is a cross-sectional view showing a pipe connection structure according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of portion A of FIG. 1.
3 is a cross-sectional perspective view of the socket ring of FIGS. 1 and 2.
4 is a flowchart illustrating a method of manufacturing a metal tube having a socket of FIG. 1.
5 is a cross-sectional view showing an example of the first pipe and socket ring joining process of FIG.
6 is a cross-sectional view showing another example of the first pipe and socket ring bonding process of FIG.
7 is a graph showing the relationship between plastic deformation and elastic deformation occurring in the bonding process of FIGS. 5 and 6.
8 is a sectional view showing the main part of the pipe connection structure according to the second embodiment of the present invention.
9 is a perspective view of the socket ring of FIG. 8.
10 is a cross-sectional view showing the main part of the pipe connection structure according to the third embodiment of the present invention.
FIG. 11 is a cross-sectional perspective view of the socket ring of FIG. 10.
12 is a front view showing the main part of the pipe connection structure according to the fourth embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. For reference, in the drawings referred to describe the embodiments of the present invention, the size of the component, the thickness of the line, etc. may be somewhat exaggerated for convenience of understanding. In addition, the terms used to describe the embodiments of the present invention are mainly defined in consideration of functions in the present invention, and may vary according to intentions, customs, and the like of users and operators. Therefore, the terms should be interpreted based on the contents throughout the present specification.

1 is a cross-sectional view showing a pipe connection structure according to a first embodiment of the present invention. 2 is an enlarged view of a portion A of FIG. 1, and FIG. 3 shows the socket ring of FIGS. 1 and 2.

Referring to FIG. 1, reference numerals 10 and 20 denote one first tube to be connected to each other and the second tube to the other, and the pipe connection structure according to the first embodiment of the present invention is the first tube 10 and the first tube. The two pipes 20 are connected to each other by a mechanical joint method. In addition, for this purpose, the pipe connection structure according to the first embodiment of the present invention, the socket ring 30 constituting a part of the socket for the interconnection of the pipe, the sealing member 40 to maintain the airtight when the interconnection of the pipe ), Binding means (50) for maintaining the interconnection of the pipes.

According to the material, the first tube 10 is a tube made of a metal material including steel, iron, stainless steel, aluminum, Al, and the like. In the case of the second tube 20, such a metal tube may be used, or a non-metallic tube made of synthetic resin or the like may be used. Accordingly, the first tube 10 and the second tube 20 may be tubes of the same material or may be tubes of different materials.

Moreover, according to the form, the 1st pipe | tube 10 and the 2nd pipe | tube 20 may be a straight straight pipe | tube, or may be a release pipe | tube like a curved pipe | tube or a T-shaped pipe | tube. In addition, the cross section may be circular or polygonal, such as a square. The shape of the first tube 10 and the second tube 20 may be the same as or different from each other.

As shown in FIGS. 1 and 2, at least one end of the first tube 10 may be inserted into at least one end of the second tube 20 so that one end of the second tube 20 may be inserted. The socket body 11 having a larger inner diameter than the outer diameter of the insertion end of the 20 is provided, and the socket end 12 extending from the tip of the socket body 11 is provided at the tip of the socket body 11.

The insertion end of the second pipe 20 is inserted into the socket body 11. The socket end 12 is formed in a tapered shape that gradually opens outward toward the end, thereby forming a ring-shaped sealing space between the socket end 12 and the insertion end of the second tube 20 inserted into the socket body 11. . The socket body 11 and the socket end 12 constitute a socket body, and the socket body (see reference numerals 11 and 12) together with the socket ring 30 constitute a socket.

1 to 3, the socket ring 30 is disposed on the outer circumference of the socket body (see reference numerals 11 and 12). The socket ring 30 includes a ring body 30A and a singular or plural spikes 30B. The socket ring 30 is made of a metal or non-metal material and is manufactured by molding at a time by using a mold so that the ring body 30A and the spike 30B are integrally formed.

The ring main body 30A is in close contact with the outer circumferential surface of the socket body 11 in the first tube 10 at the central portion thereof, and the crimping hole 31 for pressing the socket body 11 penetrates. And the spike 30B protrudes toward the center part from the inner peripheral surface of the crimping hole 31, and is firmly lodged in the outer peripheral surface of the socket body 11. Thus, the socket ring 30 is firmly bonded to the outer circumferential surface of the socket body 11 of the first tube 10.

Here, according to the configuration in which the inner circumferential surface of the crimping hole 31 is in close contact with the outer circumferential surface of the socket body 11, since the socket body 11 is crimped by the crimping hole 31, the joined socket ring 30 is joined. It is possible to prevent the phenomenon of being beaten due to the eccentric load, and thus the socket ring 30 can be bonded to the socket body 11 with further improved strength.

In addition, according to the configuration in which the spike 30B is embedded in the outer circumferential surface of the socket body 11, since the socket body 11 and the socket ring 30 are structurally coupled, the compression holes closely contact the outer circumferential surface of the socket body 11. By the combined action with (31), it is possible to further increase the bonding strength to the junction of the first tube 10 and the socket ring 30.

The spike 30B is formed in a closed ring shape along the inner circumferential direction of the crimping hole 31 and is entirely embedded in the socket body 11 along the outer circumferential direction. According to this shape, since the contact area of the spike 30B with respect to the outer peripheral surface of the socket body 11 is greatly increased, the bonding strength to the joint portion of the first tube 10 and the socket ring 30 can be further improved. Can be. Of course, if the number of spikes 30B provided is increased, the bonding strength to the joint is further enhanced.

Such a spike 30B may be formed to have a pointed portion including the tip so as to be easily embedded in the outer circumferential surface of the socket body 11. In addition, the spike 30B may be formed so that the protruding length and width are constant. And, if the cross-sectional shape of the socket body 11 is circular, the spike 30B may be formed in a closed circular shape (closed circular shape) corresponding to the shape of the socket body 11.

As the spike 30B formed in the closed ring shape is pinched on the outer circumferential surface of the socket body 11, a recess 13 having a shape corresponding to the shape of the spike 30B is formed. That is, the concave recess 13 is formed in a ring shape along the outer circumferential direction of the socket body 11. Of course, the recess 13 is in close contact with the embedded spike 30B.

Referring to FIG. 3, the ring body 30A has a tapered surface 32 corresponding to the tapered outer circumferential surface of the socket end 12. The tapered surface 32 may be formed as an inner circumferential surface of the hole extending from the crimping hole 31. The socket end 12 and the tapered surface 32 of the shape corresponding to the shape that is open toward the end toward the end is separated from at least one of the first tube 10 and the socket ring 30 (see FIG. 1). As a reference, when the external force acts on the first pipe and the socket ring on the right), it contacts each other, so that the complex action of the pressing and closing action of the pressing hole 31 and the pressing action of the spike 30B is applied. As a result, the separation and separation of the first tube 10 and the socket ring 30 are strongly inhibited, thereby stably maintaining the bonding state between the first tube 10 and the socket ring 30.

Sealing member 40 is made of an airtight material (rubber, etc.). As shown in FIG. 1, the sealing member 40 is inserted into a sealing space between the socket end 12 and the insertion end of the second tube 20.

The binding means 50 is a first pipe connected to the outer circumference of the socket body 11 by binding the first pipe 10 to which the socket ring 30 is joined and the second pipe 20 inserted into the socket body 11. (10) to prevent separation of the second tube (20). As shown in FIG. 1, the binding means 50 includes a tube ring mechanism 52 and 53 for fastening the pressure ring 51 fitted on the outer circumference of the second tube 20, the socket ring 30, and the pressure ring 51. ) And a position fixing mechanism 54 for fixing the position of the pressure wheel 51 with respect to the second tube 20.

Here, the pipe fastening mechanisms 52 and 53 are configured to access the socket ring 30 and the pressure ring 51 by bolting. The pressing ring 51 has a pressing surface for pressing the sealing member 40 against the sealing space when the bolt is tightened by the pipe fastening mechanisms 52 and 53. According to the pressing action of the pressing surface of the pressure wheel 51, the sealing member 40 is accommodated in the sealing space in the press-fit state.

Pipe fastening mechanism (52, 53) is composed of a plurality of fastening bolts 52 and fastening nuts 53 which are screwed together. The fastening bolts 52 are fastened to the catching portions 33 of which the bolt heads constitute the socket ring 30, respectively. The pressing wheel 51 has through holes through which the bolt bodies of the fastening bolts 52 pass, respectively. The through holes may be spaced apart from each other along the circumferential direction with respect to the center of the pressure ring 51. The fastening nuts 53 are respectively coupled to the bolt bodies of the fastening bolts 52 passing through the through holes of the pressure wheel 51 while being caught by the locking portion 33.

Interlocking of the fastening bolts 52 and the fastening nuts 53 may not be a bolt head of the fastening bolts 52, but the fastening nuts 53 may be caught by the catching part 33. The locking portion 33 is provided in the peripheral region of the crimping hole 31. For example, the locking portion 33 may be configured to have a stepped portion formed along the outer circumferential side on the outer circumferential side of the ring body 30A, and the fastening bolts 52 may pass through the outer circumferential side of the ring body 30A. It may consist of a formed hole and a peripheral portion of the hole.

The position fixing mechanism 54 is composed of a plurality of spike bolts. The spike bolts 54 are screwed in a state in which they are radially disposed on the pressing wheels 51, respectively, and are spaced apart or approached with respect to the outer circumferential surface of the second pipe 20 in the rotational direction. Of course, when the spike bolts 54 approach the outer circumferential surface of the push wheel 51, the push wheel 51 is fixed in position. The spike bolts 54 may be disposed between the through holes of the pressure ring 51, respectively.

According to the first embodiment of the present invention configured as described above, the socket ring 30 in the socket body 11 of the first tube 10 has excellent strength due to the crimp hole 31, the spike 30B, and the like. A metal tube joined in an integral structure is provided.

A metal tube having a socket composed of a socket ring 30 joined to at least one end of the first tube 10 and the first tube 10 includes both the first tube 10 and the socket ring 30 In the case of the metal material, the socket body 11 having a relatively enlarged cross section is formed in the first pipe 10 due to the primary expansion pipe processing, and the outer side of the socket body 11 is formed by the secondary expansion pipe processing. It can be manufactured through a socket ring joining process to form a socket end (12). 4 to 6 illustrate a method of manufacturing a metal tube having a socket.

4 and 5, first, a first tube 10 of metal material and a socket ring 30 of metal material are prepared. At this time, the prepared first tube 10 may be manufactured such that the cross-sectional size is generally constant. The prepared socket ring 30 is made to include the ring main body 30A and the spike 30B, and is provided with the crimping hole 31, the taper surface 32, and the locking part 33, and also the spike 30B. ) Is formed in a closed ring shape. The crimping hole 31 and the spike 30B have a large minimum in comparison with the maximum outer diameter of the portion (hereinafter referred to as the portion to be enlarged) that will form the socket body (see reference numerals 11 and 12) in the prepared first tube 10. It is formed to have an inner diameter.

Next, as shown in Figure 5 (A), the socket ring 30 is fitted to the outer circumference of the portion to be expanded in the first tube (10). At this time, the socket ring 30 may be disposed so that the center of the pressing hole 33 coincides with the portion to be expanded of the first tube 10.

Next, as shown in (B) of FIG. 5, the expansion pipe 100 having a shape corresponding to the socket body 11 and the socket end 12 is a predetermined speed to the portion to be expanded in the first pipe 10. And pressure. Then, the portion to be expanded of the first tube 10 is uniformly enlarged generally in the radial direction by the first expansion region 101 of the front portion formed to correspond to the socket body 11 in the expansion mold 100. The primary expansion is made first, and after the primary expansion, the expansion pipe 100 gradually becomes outward toward the end by the second expansion area 102 behind the first expansion area 101 formed to correspond to the socket end 12. As a result, the second expansion is uniformly performed. At this time, according to the primary expansion pipe, a socket body 11 having a relatively enlarged cross section is formed at a portion to be expanded in the pipe member 10. And, according to the secondary expansion, the socket end 12 which is gradually opened outward is formed at the front end of the socket body 11.

Here, the formed socket body 11, the outer peripheral surface is in close contact with the inner circumferential surface of the crimping hole 31 without a gap, and also the recessed portion 12 in which the spike 30B is embedded as the spike 30B is strongly penetrated into the outer circumferential surface Is formed. The formed socket end 12 has an outer circumferential surface facing the tapered surface 32. Of course, the recessed part 12 is formed in the shape corresponding to the spike 30B.

Next, the inserted expansion mold 100 is moved in the opposite direction and separated from the first pipe 10. Then, a metal tube in which the socket ring 30 is firmly joined to the socket body 11 constituting the socket body (see reference numerals 11 and 12) in the first tube 10 in an integral structure is provided.

On the other hand, although the cross-sectional size of the socket body 11 formed by expansion pipe processing is shown in FIG. 5 and the like, the socket body 11 may have an enlarged shape so that the cross-sectional size gradually increases toward the tip. That is, as shown in FIG. 6, the socket body (using the expansion mold 100 having the first expansion region 101 having a shape corresponding to the socket body 11 that gradually increases in cross-sectional size toward the tip end thereof). 11) can be formed. Then, since the socket body 11 has a taper of a predetermined angle (a), and the pressing hole 31 also has a taper formed to correspond to the taper of the socket body 11, the first tube 10 joined to each other and The socket ring 30 can be strongly prevented from detaching due to external force.

Considering the bonding strength of the first pipe 10 and the socket ring 30, the outer diameter of the socket body 11 is kept larger than the inner diameter of the crimping hole 31 before expansion, and the crimping hole ( 31) the plastic deformation is smaller than the socket body 11, it is preferable that the inner diameter is maintained in a state smaller than the outer diameter of the socket body (11). Therefore, a plastic metal material having a relatively small elastic region and a small modulus of elasticity is advantageous as the material of the first tube 10, and the elastic region is relatively large as the material of the socket ring 30, which is expanded by expansion. It may be advantageous for the metal material to be later restored to or substantially close to the original. For example, if the first pipe 10 is applied to the steel pipe, the socket ring 30 is made of cast iron material, after expansion pipe processing, the socket body 11 is crimped with a larger force by the pressing hole 31 Thus, it is possible to provide a joint having an improved joint strength.

Steel and cast iron are basically the same iron, but differ in terms of carbon content. Cast iron has higher carbon content than steel, so it has higher elastic strength and higher yield strength than steel.

FIG. 7 is a graph showing a relationship between plastic deformation and elastic deformation generated when the pipe is applied as the first pipe 10 and the socket ring 30 is made of cast iron. As shown in FIG. 7, since the first pipe 10, which is a steel pipe, and the socket ring 30, which is a cast iron material, have different carbon contents, deformation amounts are different from each other.

The crimping hole 31 of the socket ring 30 is disposed on the outer circumference of the portion to be expanded in the first pipe 10, and the expansion mold 100 is inserted into the portion to be expanded to enlarge the outer diameter of the portion to be expanded to Dmax. Next, when the expansion pipe mold 100 is removed, the portion to be expanded of the first pipe 10 has an outer diameter Dp deformed along a blue line, and the crimping hole 31 of the socket ring 30 has an inner diameter Dr. It is deformed along the red line. The inclination of the red line in the graph is larger than that of the blue line because the elastic strength of the socket ring 30 made of cast iron material is larger than that of the first pipe 10, which is a steel pipe. The broken point in the blue line represents the yield strength of the first pipe 10, which is a steel pipe. The red line is not broken because the yield strength of the cast iron socket ring 30 is higher than the maximum force shown in the graph.

Before expanding the pipe, the portion outside diameter Dp1 to be expanded in the first pipe 10 is smaller than the inner diameter Dr of the pressing hole 31, and the portion to be expanded is inserted into the pressing hole 31. Since the outer diameter Dp2 of the socket body 11 is larger than the inner diameter Dr of the crimping hole 31, the outer circumferential surface of the socket body 11 is crimped by the crimping hole 31, and the spike 30B is formed on the outer circumferential surface. Gets stuck. The first pipe 10 and the socket ring 30 joined by expansion pipe processing continuously push each other by the residual stress after the expansion of the outer circumferential surface of the socket body 11 and the inner circumferential surface of the crimping hole 31 close to each other. It has an integrated structure.

As described, the material properties of the first tube 10 and the socket ring 30 serves as an important factor that affects the joining of the first tube 10 and the socket ring 30 by expansion processing. In addition, structural variables such as thickness in the first tube 10 or the socket ring 30 are also factors that affect the elastic strength and the yield strength, such as the thickness of the first tube 10 or the socket ring 30. By modifying the structural shape, it is possible to appropriately supplement the material properties of the first pipe 10 or the socket ring 30 required for expansion pipe processing.

In the metal tube having the socket provided by the first embodiment of the present invention, the joint strength of the joint was tested as follows to confirm the superiority of the joint of the first tube 10 and the socket ring 30.

As the first pipe 10, a steel pipe having a thickness of 150 A and a thickness of 4.6 mm was used, and the socket ring 30 made of cast iron was joined to the steel pipe by expansion pipe processing (using expansion pipe mold). Then, a load was applied to the joined steel pipe and the socket ring 30 in a direction separated from each other using a jig. As shown in Table 1, the spike 30B and the socket end 12 conditions were different from each other, but the rest was performed under the same conditions.

As a result, the joint of the steel pipe and the socket ring 30 was released in 6.5 tons in test 1, 15.3 tons in test 2, 25 tons in test 3, and 40 tons in test 4, respectively.

According to the test 1, it turns out that the joining strength is shown only if the spike 30B, the socket end 12, the outer peripheral surface of a steel pipe, and the inner peripheral surface of the crimping hole 31 closely contact each other and crimp each other. According to the test 2 to 4, it can be seen that the upward adjustment of the bonding strength is made depending on whether the spike 30B or the socket end 12 is applied, the protruding length of the spike 30B, the length of the socket end 12, or the like. Bar strength can be raised to the required level.

TABLE 1

8 is a cross-sectional view showing the main part of the pipe connection structure according to the second embodiment of the present invention, Figure 9 is a perspective view showing the socket ring of FIG. As shown in Figs. 8 and 9, the second embodiment of the present invention, in comparison with the first embodiment of the present invention, has a ring in the socket ring 30 with respect to all other configurations and functions being the same. Only the point where the elastic provision part 34 which has the groove structure in the outer peripheral surface of the main body 30A is formed in singular or plural is different.

The elastic provision part 34 serves to lower the elastic modulus of the socket ring 30, and is disposed on the outer circumference of the crimping hole 31 to expand the tube using an expansion mold (see reference numeral 100 in FIGS. 5 and 6). Increasing the elastic deformation amount of the socket ring 30 during processing. The elastic provision part 34 may be provided at a uniform interval along the outer circumferential direction of the socket ring 30 so that the expansion of the inner circumferential surface of the pressing hole 31 is more uniform during expansion pipe processing.

FIG. 10 is a sectional view showing a main part of a pipe connection structure according to a third embodiment of the present invention, and FIG. 11 is a sectional perspective view showing the socket ring of FIG. As shown in Figures 10 and 11, the pipe connection structure according to the third embodiment of the present invention, when compared with the first or second embodiment of the present invention, the other configuration and its action are all For the same, only the point that further includes a configuration for preventing the paired fastening bolts 52 to rotate together in the same direction in the process of tightening or loosening the fastening nuts 53 are different.

To this end, the locking portion 33 provided in the socket ring 30, has a locking step 35 is formed on the stepped to the bolt head of the fastening bolts 52 and the engaging surface of the stepped step. At this time, the stepped portion of the locking portion 33 is formed along the outer circumferential direction of the ring body 30A, and the side on which the bolt heads of the fastening bolts 52 are engaged is the locking surface. The locking groove 35 is formed along the locking surface to have an annular structure. The bolt heads of the fastening bolts 52 are formed with locking protrusions 52-1 inserted into the locking grooves 35, respectively.

According to the third embodiment of the present invention, when the fastening nuts 52 are coupled to the fastening bolts 52 with the locking protrusion 52-1 inserted into the locking groove 35, the fastening nut ( The fastening bolts 52 may be prevented from being rotated together with the fastening nuts 53 due to the locking action of the locking protrusions 52-1 with respect to the locking grooves 35 when the 53 is loosened or retightened.

12 is a front view showing the main part of the pipe connection structure according to the fourth embodiment of the present invention. As shown in FIG. 12, the fourth embodiment of the present invention has the first conduit 10 having the same configuration and operation as those of the first to third embodiments. The only difference is that the apparatus further includes an opening and closing unit 60 having a valve body for opening and closing a pipe. That is, to illustrate that the opening and closing unit 60 having a valve function can be applied, according to the operation direction of the handle (handle) constituting the opening and closing unit 60, the pipeline of the first pipe 10 by the valve body It can be open or closed.

On the other hand, depending on the implementation conditions, instead of the opening / closing unit 60, a filter or the like to be replaced after being used for a certain period of time may be disposed in the pipeline of the first tube 10. When the filter is applied, foreign matter contained in the fluid may be removed by filtering the fluid flowing along the pipeline of the first pipe 10.

The present invention has been described above, but the present invention is not limited to the disclosed embodiments and the accompanying drawings, and may be variously modified by those skilled in the art without departing from the technical spirit of the present invention. In addition, the technical idea described in the embodiments of the present invention may be implemented independently, or two or more may be implemented in combination with each other.

10: first tube
11: expansion tube
12: main part
13: pipe chin
20: second tube
30: socket ring
30A: Ring Body
31: pressing hole
32: tapered surface
33: locking part
34: elastic provision part
35: hanging groove
30B: Spike
40: sealing member
50: binding means
60: opening and closing unit
100: expansion mold

Claims (9)

A first tube of metal; A socket ring disposed on an outer circumference of at least one end of the first tube,
The first tube is provided with a socket body having a socket body having an inner diameter larger than the outer diameter of the second tube so that the second tube can be inserted into at least one end thereof,
The socket ring is bonded to the socket body by having a compression hole in which the inner circumference is in close contact with the outer circumference of the socket body and at least one spike protruding from the inner circumference of the compression hole and being embedded in the outer circumference of the socket body.
The outer periphery of the socket body is provided with a recessed in the spike,
In the peripheral area of the crimping hole in the socket ring is provided with a locking portion for engaging the tube fastening mechanism of the binding means for engaging the first tube with the second tube,
Metal tube with socket. The method according to claim 1,
The spike is formed in the form of a closed ring (closed ring) along the inner peripheral surface of the pressing hole,
Metal tube with socket. The method according to claim 1 or 2,
The socket body has a socket end extending in a tapered shape extending outward from the tip of the socket body to form a sealing space between the second tube and
Metal tube with socket. A first tube of metal; A socket ring of metal disposed on an outer periphery of at least one end of the first tube,
The first tube is provided with a socket body having a socket body having an inner diameter larger than the outer diameter of the second tube so that the second tube can be inserted into at least one end thereof.
The socket ring is bonded to the socket body by having a compression hole in which the inner circumference is in close contact with the outer circumference of the socket body and at least one spike protruding from the inner circumference of the compression hole and being embedded in the outer circumference of the socket body.
The socket body is provided with a recessed part in which the inner peripheral surface of the crimping hole is in close contact with the outer peripheral surface by the expansion pipe processing, and the spike is embedded to embed the spike.
In the peripheral area of the crimping hole in the socket ring is provided with a locking portion for engaging the tube fastening mechanism of the binding means for engaging the first tube with the second tube,
Metal tube with socket. The method according to claim 4,
In the expansion pipe processing, the socket body is disposed on an outer circumference of an end (hereinafter, referred to as a portion to be expanded) in the first pipe to form the socket body, and the expansion pipe is inserted into the expansion portion to form the socket body. doing,
Tube with socket. The method according to claim 4 or 5,
The socket body has a socket end extending in a tapered shape extending outward from the tip of the socket body to form a sealing space between the second pipe,
The socket end is formed by the expansion processing,
Metal tube with socket. The method according to claim 4 or 5,
The socket body is enlarged to have a constant cross-sectional size or to increase toward the end by the expansion pipe,
Metal tube with socket. A first tube of metal; A socket ring disposed on an outer circumference of at least one end of the first pipe; It includes an opening and closing unit having a valve function for opening and closing the pipe of the first pipe or a filter having a filtration function for the fluid flowing along the pipe,
The first tube is provided with a socket body having a socket body having an inner diameter larger than the outer diameter of the second tube so that the second tube can be inserted into at least one end thereof,
The socket ring is bonded to the socket body by having a compression hole in which the inner circumference is in close contact with the outer circumference of the socket body and at least one spike protruding from the inner circumference of the compression hole and being embedded in the outer circumference of the socket body.
The outer periphery of the socket body is provided with a recessed in the spike,
In the peripheral area of the crimping hole in the socket ring is provided with a locking portion for engaging the tube fastening mechanism of the binding means for engaging the first tube with the second tube,
Metal tube with socket. A first tube of metal provided with at least one end of the socket body and a socket body having a socket end extending in a tapered shape outwardly from the tip of the socket body;
A second tube having one end inserted into the socket body;
It is disposed on the outer circumference of the socket body, and has a pressing hole in which the inner circumferential surface is in close contact with the outer circumferential surface of the socket body; A socket ring having a tapered surface corresponding to an outer circumferential surface of the socket end;
A sealing member inserted into a sealing space between the socket end and the second pipe;
A pressure wheel mounted on an outer circumference of the second pipe and provided with a pressing surface for pressing the sealing member in the sealing space;
And a pipe fastening mechanism for accessing the socket ring and the pressure wheel by tightening the bolt in a state where the sealing member is caught by the locking portion of the socket ring and the locking portion of the pressure ring such that the sealing member is pressed by the pressing surface.
Pipe connection structure.

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