WO2000057093A1

WO2000057093A1 - Pipe joint and pipe body connected with the pipe joint

Info

Publication number: WO2000057093A1
Application number: PCT/JP2000/001753
Authority: WO
Inventors: Tadashi Hattori; Takamasa Hattori
Original assignee: Tadashi Hattori; Takamasa Hattori
Priority date: 1999-03-23
Filing date: 2000-03-22
Publication date: 2000-09-28
Also published as: JP3032200B1; CN1267804A; AU3325100A; TW420269U; KR20000062114A; JP2000274565A

Abstract

A pipe joint, comprising, in order to connect a pair of pipe bodies having an annular groove in their end part outer peripheral surface, a joint main body provided with a pair of annular projections which are installed on both pipe bodies so that the opening end surfaces of both pipe bodies cover the entire periphery of the joints facing each other and their top ends are fitted into the annular grooves in contact with the bottom part entire periphery of the annular grooves, and with an annular seal member which is installed between the inner peripheral surface between both annular projections of the joint main body and the end part outer peripheral surface of both pipe bodies and seals the joints; the joint main body comprising a plurality of arc members having connection holes drilled axially therethrough which are installed at both end parts in circumferential direction of the main body, wherein the end parts of the arc members in circumferential direction are overlapped with each other, a connection pin is fitted into both connection holes overlapped with each other, and a plurality of arc members are connected with the connection pin so as to form these members in an annular shape and installed on both pipe bodies, whereby, because the annular projection is fitted to the annular grooves, both connection holes are overlapped with each other and the connection pin is allowed to be fitted to the grooves and, when the connection pin is fitted to the grooves, it can be confirmed that the annular projections are fitted to both annular grooves.

Description

TECHNICAL FIELD The present invention relates to a pipe joint and a pipe connected by the pipe joint.

The present invention relates to a pipe joint having a configuration in which a plurality of arc-shaped members, such as a half-split and a three-split, are connected to each other by a connecting means when attached to a pipe to form an annular shape, and the pipe joint. The pipes are connected by a pipe. Background art

Conventionally, as this type of pipe joint, as shown in FIG. 20, a pair of pipe bodies 50, 50 having an annular groove 52 having a rectangular shape in cross section on an end outer peripheral surface 51, is connected. An annular ring detachably attached to the seam P via an annular seal member 54 so that the open end faces 59 of the two tubular bodies 50, 50 cover the seam P facing each other over the entire circumference. One having a joint body 53 is known. At both ends in the axial direction of the joint main body 53, there are formed annular projections 58 each of which fits into the annular groove 52 and whose tip abuts on the entire circumference of the flat bottom of the annular groove 52. .

The joint body 53 has a structure in which two half-shaped arc members 55, 55 are connected by bolts 56 and nuts 57, as shown in FIG. 21. Is formed. Specifically, flange portions are formed at both ends in the circumferential direction of the arc-shaped member 55, and through holes through which bolts 56 can be inserted are formed in the flange portions in a direction perpendicular to the axial direction. Has been established. Then, the two flange portions are joined, the bolt 56 penetrates the overlapped two through holes, the nut 57 is screwed into the bolt 56, and the two flange portions are fastened to each other. The arc-shaped members 55, 55 are connected to form an annular shape. However, since the bolt 56 is used as the connecting means, the diameter of the insertion hole is larger than that of the bolt 56. That is, due to the diameter difference between the through hole and the bolt 56, the mounting Sometimes, even when the annular projection 58 is not fitted in the annular groove 52, the bolt 56 can be passed through the through hole. Therefore, if the pipe is tightened as it is, the fluid may leak, or if the pressure inside the pipe rises suddenly due to a war hammer phenomenon or the like, the connected pipe body 50 will fall out of the pipe joint. It will also come off. In particular, when piping near a wall or the like, the wall side of the piping is difficult to see from the operator side, so that the annular projections 58 do not fit into the annular grooves 52 on the wall side, and fastening was frequently performed as it was. It is.

A configuration is also conceivable in which a through hole is drilled in the arc-shaped member 55 in the axial direction, and a bolt 56 is passed through the through hole and the bolt is fastened in the axial direction. Due to the diameter difference, the joint body 53 may be displaced so as to expand outward in the radial direction with an increase in the internal pressure of the fluid, which may cause fluid leakage.

In any case, in a configuration in which the plurality of arc-shaped members 55 are connected by the bolts 56, fluid may leak due to a difference in diameter between the bolts 56 and the through holes. In view of the above, the present invention has been made in view of the above-mentioned conventional problems, and has an object to provide a pipe joint that can reliably connect both pipe bodies and reliably prevent fluid leakage from a seam. And Disclosure of the invention

According to the present invention, in order to connect a pair of pipes each having an annular groove on an end outer peripheral surface, both pipes are attached to both pipes so as to cover the entire seam where the open end faces of the pipes face each other, and A joint body having a pair of annular projections, the tips of which contact the entire circumference of the bottom of the annular groove and fit into the annular groove; an inner peripheral surface between both annular projections of the joint main body and an outer peripheral surface of end portions of both tubular bodies; And an annular seal member mounted between the two to seal the seam. The joint body includes a plurality of arc-shaped members each having a connection hole formed in the axial direction at both ends in the circumferential direction, and circumferential ends of the arc-shaped members are overlapped with each other. A connection pin is fitted into both of the connection holes provided, and a plurality of arc-shaped members are connected by the connection pin to form an annular shape and to be mounted on both pipes. When the annular projections fit into each other, the two connection holes overlap and the connection pin can be inserted.The insertion of the connection pins makes it possible to confirm that the annular projections are fitted into both annular grooves. I have.

In this pipe joint, a plurality of arc-shaped members are connected to each other and attached to both pipes as an annular joint body. However, since a connecting pin is inserted into a connecting hole, an annular protrusion is formed in each of the annular grooves. By correctly fitting the connecting holes, the two connecting holes are completely overlapped, and the connecting pins can be fitted into the two connecting holes. Therefore, the worker can confirm that the annular projection is correctly fitted into both annular grooves by the fitting of the connecting pin.

Then, when the pipe joint is installed, the joint is sealed by the annular seal member, the joint body covers the outer periphery thereof, and the tip of the annular projection is in contact with the entire circumference of the bottom of the annular groove. Fluid leakage is reliably prevented. In addition, since the connection bin is fitted along the axial direction, the connection state of the arc-shaped members is maintained by the connection pin even if the pressure inside the tube increases.

On the other hand, a flaw may be formed on the outer peripheral surface of the end of the pipe during piping work, etc. Even in such a case, the flaw along the axial direction of the pipe may cause leakage of fluid from the joint. In such a case, it is particularly preferable to form an annular pressing projection on the inner peripheral surface between the two annular projections. That is, the outer peripheral surface of the annular seal member is pressed to the inner peripheral side by the pressing protrusion, and the pressing force causes the annular seal member to more firmly contact the outer peripheral surface of the end portion of the tubular body, thereby deforming the annular seal member. It can enter the flaws and prevent leakage of fluid from the flaws. Therefore, when connecting the two pipes, there is no need to grind the outer peripheral surface of the end of the pipe with a paper file or the like, as in the conventional case, to remove the scratches.

It is also possible to provide a pressing protrusion on the outer peripheral surface of the annular seal member instead of providing the pressing protrusion on the joint body side.

In addition, by making the tip of the annular projection abutting on the entire circumference of the bottom of the annular groove a curved surface, even if both connected pipes are inclined, the tip of the annular projection follows the annular groove of the inclined pipe. The contact state is maintained, so that even if the tube vibrates due to an earthquake or the like, the leakage of fluid can be prevented more reliably, and the durability against vibration can be increased, compared to a flat end. You. Moreover, since the tip of the annular projection is a curved surface, it easily fits in the annular groove of the tube. As described above, the pipe joint according to the present invention has a configuration in which the connecting pin cannot be fitted unless the annular projections are completely fitted into both annular grooves. Therefore, there is no danger that the two pipes will be connected in a state where they do not fit, and the two pipes can be reliably connected and the leakage of the fluid can be prevented reliably and beforehand.

Further, a pipe body of the present invention is a pipe body connected by the pipe joint of the present invention, wherein an annular groove formed on an end outer peripheral surface is substantially V-shaped in cross section, and a bottom portion of the annular groove. Is formed in a curved shape or a flat shape.

When the pipe is connected by the pipe joint according to the present invention, since both side surfaces forming the annular groove are inclined surfaces, if a part of the annular projection fits into the annular groove, the remaining other part of the annular projection Can be easily fitted into the annular groove.

As described above, in the tubular body of the present invention, since the annular groove is substantially V-shaped in cross section, the annular projection of the pipe joint easily fits into the annular groove. Therefore, it is possible to prevent the fluid from leaking due to poor fitting of the annular projection.

Moreover, by forming the bottom portion into a curved surface or a flat shape, stress concentration of the pipe at the location where the annular groove is formed can be reduced, and the durability of the pipe can be increased.

Further, since the annular groove has a substantially V-shaped cross section, the annular groove can be accurately and easily formed even in a high-hardness pipe such as a stainless steel pipe or a titanium pipe. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side view of a pipe joint according to an embodiment of the present invention when viewed from an axial direction in a connected state of pipes.

FIG. 2 is a front view of the appearance.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is an enlarged view of a main part of FIG. Fig. 6 shows the main part of the joint body of the pipe joint, Fig. 6A is a side view, and Fig. 6B is a front view.

Fig. 7 shows an annular seal member used for the pipe joint, Fig. 7A is a cross-sectional view showing the whole, and Fig. 7B is an enlarged view of a Q section in Fig. 7A.

FIG. 8 is a cross-sectional view showing the connecting operation of the tubes.

FIG. 9 is a cross-sectional view showing the connecting operation of the tubes.

FIG. 10 is a cross-sectional view showing the connecting operation of the tubes.

FIG. 11 is a cross-sectional view showing a pipe connected by the pipe joint.

FIG. 12 is a cross-sectional view showing a pipe body of another embodiment connected by the pipe joint. FIG. 13 is a sectional view showing a pipe joint of another embodiment.

FIG. 14 is a sectional view of a principal part of the annular seal member used in the embodiment. FIG. 15 is a sectional view showing a pipe joint according to another embodiment.

FIG. 16 is a sectional view of a principal part of an annular seal member used for a pipe joint according to another embodiment.

FIG. 17 is a sectional view of a principal part of an annular seal member used for a pipe joint according to another embodiment.

FIG. 18 is a side view of the pipe joint of another embodiment viewed from the axial direction in a state where the pipes are connected.

FIG. 19 is a cross-sectional view taken along line DD of FIG.

FIG. 20 is a sectional view of a main part of a conventional pipe joint.

FIG. 21 is a side view of the joint body of the pipe joint as viewed from the axial direction. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, in one embodiment of the present invention, a joint body detachably mounted on the two pipes 1, 1 so as to connect the pair of pipes 1, 1 with their open end faces la facing each other. A pipe joint comprising: an annular seal member 3 mounted between the joint body 2 and the pipe body 1 to seal a seam P formed by facing open end faces la of the pipe body 1; The connection state of the pipe 1 connected by the pipe joint will be mainly described with reference to FIGS. 1 to 11.

First, the connected pipe 1 will be described. The pipe 1 is a relatively thick steel pipe or resin pipe, and as shown in FIG. 8, an annular groove 5 is formed on the outer peripheral surface 4 of the end over the entire circumference. The annular groove 5 is formed in a substantially V shape in cross section as shown in FIG. 5 and FIG. 11, and a bottom portion 5a thereof has a curved surface shape.

The opening angle of the annular groove 5 is set to approximately 90 degrees. That is, both side surfaces 5 b and 5 c forming the annular groove 5 are approximately 45 degrees with respect to the outer peripheral surface 4. Slope.

It is preferable that the opening angle S of the annular groove 5 is set to approximately 60 degrees to approximately 100 degrees. That is, it is preferable that the inclination angle of the both side surfaces 5 b and 5 c with respect to the outer peripheral surface 4 be set to approximately 40 degrees to approximately 60 degrees.

As shown in FIG. 12, the bottom 5a of the annular groove 5 may be flat. By making the bottom 5a curved or flat instead of sharp, the stress concentration at the location where the annular groove 5 is formed can be reduced, and the durability of the tube 1 is increased.

In order to cover and seal the entire outer periphery of the seam P, an annular sealing member 3 made of rubber is attached to the outer peripheral surfaces 4, 4 of the ends between the two annular grooves 5, 5, and the inner peripheral surface 6 is a pipe. The end of the body 1 contacts the outer peripheral surface 4. A stopper wall 7 protruding toward the center of the annular seal member 3 is provided substantially at the center of the inner peripheral surface 6 of the annular seal member 3 so as to be able to abut on the open end surface 1a of each tube 1 along the entire circumference. . Both side surfaces 8, 8 of the stopper wall 7 are in contact with the open end surfaces 1a, 1a of the tubular body, respectively.

As shown in FIGS. 1A and 1B, the annular seal member 3 has an annular wall 10 on the inner peripheral surface 6 and both side surfaces 8 and 8 of the stopper wall 7, respectively. An annular recess 11 adjacent to the annular wall 10 is formed. More specifically, the annular wall 10 of the inner peripheral surface 6 is formed symmetrically at two locations on both sides of the stopper wall 7 around the stopper wall 7. Further, considering the prevention of fluid leakage from the outer peripheral surface 4 at the end of the tubular body 1 and the ease with which the annular sealing member 3 can be attached to the tubular body 1, the annular wall 10 of the inner peripheral surface 6 has Is axially inside (Stopper wall 7 side) It is formed in a substantially triangular shape in cross section inclined toward the side. The recessed portion 11 is adjacent to the inside of each annular wall 10, and when the annular sealing member 3 is attached to the tubular body 1, the recessed portion 11 is closed. It becomes the escape part of. That is, the recess 11 is also formed in a substantially triangular cross section so that the tip of each annular wall 10 enters the recess 11 inside the ring wall 10 at the time of mounting.

In addition, an annular wall 10 and a recess 11 of the same shape are formed on both sides 8 of the stopper wall 7, one at a time. The annular wall 10 of the stopper wall 7 has its tip inclined toward the center of the annular seal member 3 from the viewpoint of preventing fluid leakage from the opening end face 1a. The depression 11 is adjacent to the inner peripheral side of the annular wall 1 °. When the annular seal member 3 is mounted, as shown in FIG. 5, the annular wall 10 of the inner peripheral surface 6 comes into contact with the outer peripheral surface 4 of the end of the tubular body 1, and the annular wall 1 of the side surface 8 of the stopper wall 7. Numeral 0 is in contact with the open end face 1a of the tubular body 1 and enters each of the adjacent recesses 11. Incidentally, the annular wall 10 and the recessed portion 11 of the stopper wall Ί have an effect of preventing corrosion of the opening end face 1 a of the tubular body 1.

The joint body 2 is mounted on the outer peripheral side of the annular seal member 3, and the joint body 2 is mounted so as to cover the annular seal member 3 over the entire circumference. In addition, annular projections 12 that fit into the annular grooves 5 are provided on both ends of the joint body 2 in the axial direction. Note that the diameter at the tip of the annular projection 12 and the diameter at the bottom 5a of the annular groove 5 are substantially equal. The distal end of the annular projection 12 has a curved surface so as to contact the entire periphery of the bottom 5 a of the annular groove 5 and engage with the curved surface of the bottom 5 a of the annular groove 5. Further, between the two annular projections 12, 12, there is formed an annular recess 13 which is depressed toward the outer peripheral side. The annular sealing member 3 is located between the annular concave portion 13 and the outer peripheral surfaces 4, 4 of the end portions of the tubular bodies 1, 1, and the inner peripheral surface 14 of the annular concave portion 13 is the outer periphery of the annular sealing member 3. Close contact with surface 15 On the inner peripheral surface 14 of the annular concave portion 13, a pair of small semicircular annular pressing protrusions 16 for pressing the outer peripheral surface 15 of the annular seal member 3 toward the tube 1 side are provided. Is provided. Each pressing projection 16 is provided at a position corresponding to the annular wall 1 ° of the inner peripheral surface 6 of the annular sealing member 3. The joint body 2 will be described in more detail. As shown in FIGS. 1, 2, and 9, the joint body 2 is divided into three equally-divided (120 degree-divided) triangular arc members 17. And three connecting pins 18 as connecting means for connecting the arc-shaped members 17 to each other.

Each of the arc-shaped members 1 それぞれ has substantially the same shape as a whole, and the inner peripheral surfaces of the arc-shaped members 17 have the same radius as each other. As shown in FIGS. 6A and 6B, one end of the arc-shaped member 17 in the circumferential direction is a male convex portion 19 whose central portion in the width direction (axial direction) protrudes toward the distal end. The other end in the circumferential direction of 17 is a female concave portion 20 whose both ends in the width direction protrude toward the distal end so that the male convex portion 19 is engaged with the center.

The male convex portion 19 and the female concave portion 20 are formed with connecting holes 21 into which the connecting pins 18 can be fitted in the axial direction. The male convex portion 19 of one arc-shaped member 17 engages with the female concave portion 20 of the other arc-shaped member 17 so that the circumferential ends of both arc-shaped members 17, 17 are the same. Are superimposed. Then, the connecting pin 18 is axially fitted into the overlapping connecting holes 21, 21, so that the three arc-shaped members 17, 17, 17 are connected to each other at a total of three places. An annular joint body 2 is formed. Further, when the three arc-shaped members 17, 17, 17 are connected in an annular shape, the annular protrusion 12, the pressing protrusion 16, and the like also each have an annular shape. Reference numeral 22 shown in FIG. 1 is an insertion hole into which the engaging pin 24 is inserted when the arc-shaped member 17 is connected in a ring shape, as shown in FIG.

The main part of the arcuate member 17 is formed by molding, and the connection hole 21 and the insertion hole 22 are processed after molding.

Two of the three connecting pins 18 have the same shape, and both ends in the axial direction are formed in a trumpet shape as shown in FIG. Is prevented. The cross section taken along line CC in FIG. 1 is the same as the cross section taken along line BB. As shown in FIGS. 3 and 5, one end of the remaining connection pin 18 is formed in a trumpet shape like the other connection pin 18 and has a cutout at the other end. A retaining ring 23 that can be expanded and contracted is attached. The retaining ring 23 prevents the coupling ring 21 from being pulled out. The connecting pin 18 with the retaining ring 23 attached is as shown in FIG. It is inserted at the time of mounting.

Next, the operation of connecting the pair of pipes 1, 1 will be described.

First, the ends of the other arc-shaped member 17 on the side without the insertion hole 22 are unevenly engaged with both ends in the circumferential direction of one arc-shaped member 17 without the insertion hole 22, respectively. By fitting the connecting pins 18 respectively, the three arc-shaped members 17, 17, 17 are connected in a line. After the fitting, the front end of the connecting pin 18 is formed into a trumpet shape by caulking or the like to prevent the connecting pin 18 from coming out of the connecting hole 21. As described above, two of the three connection points require work such as caulking of the connection pin 18. Therefore, it is preferable to perform the connection work in a factory or the like in advance, not at the piping site. Accordingly, the following pipe connection work can be performed using the joint body 2 in a state where only one connection is not made at the piping site. Since the connecting pin 18 is fitted in the axial direction, the arc-shaped members 17 can rotate relative to each other with the connecting pin 18 as a support shaft.

Then, as shown in FIG. 8, the annular seal member 3 is attached to one of the tubes 1 from the opening side, and the other tube 1 is inserted into the opposite side of the annular seal member 3 to face both the tubes 1, 1. Then, the above-mentioned chain-shaped joint body 2 is mounted.

The mounting work of the joint body 2 is performed, for example, as follows. That is, as shown in Fig. 9, the central arc-shaped member 17 is brought into contact with the lower side of the tube 1, and the other two arc-shaped members 17 and 17 are directed inward from both sides of the tube 1. By rotating, the male convex portion 19 of one arc-shaped member 17 is engaged with the female concave portion 20 of the other arc-shaped member 17 so that the two connection holes 21 1 and 21 are overlapped. As shown in Fig. 10, a joint body connecting jig for sandwiching the two arc-shaped members 17 and 17 to overlap the connecting holes 21 and 21 as shown in Fig. 10 includes the joining operation of the connecting holes 21 and 21. Tool 25 can be used.

The joint body connecting jig 25 has a pair of holding pieces 26, 26 opened in a V-shape. The holding piece 26 has an insertion hole into which the above-described engaging pin 24 can be inserted. 27 are each formed. Then, the engaging pins 24 are inserted into the insertion holes 22 and 27 of both the holding piece 26 and the arc-shaped member 17 to connect the holding pieces 26 and the arc-shaped member 17 to each other. Rotate 8 to increase the amount of screwing into the bolt 30 to bring both holding pieces 26 and 26 closer together. Then, the two arc-shaped members 17, 17 are closed to each other by the two holding pieces 26, 26 so as to close them, and the two connection holes 21, 21 are completely overlapped.

As described above, since the joint body 2 has a configuration in which the plurality of arc-shaped members 17 are connected to form an annular shape by fitting the connection pins 18, the use of such a joint body connection jig 25 is possible. Workability is improved. In addition, the annular projections 12 are completely fitted into the annular grooves 5, 5, and the ends thereof abut on the entire periphery of the bottom 5a. Since the pipe 1 is configured to be fitted, even if the roundness of the tubular body 1 is poor, there is an advantage that it is automatically corrected at the time of mounting by the annular projection 12 of the joint body 2.

In addition, since the rotation preventing pin 31 is inserted into the two holding pieces 26 and 26 substantially parallel to the bolt 30, the holding pieces 26 are rotated by the bolt 30 as a center, so that the holding pieces 26 are connected to each other. The connection work is facilitated without any phase shift. In addition, a spring 32 is interposed between the holding pieces 26, 26, and the springs 32 urge the holding pieces 26, 26 in the separating direction. Can operate 2 8

Then, the last connecting pin 18 can be fitted only when the two connecting holes 21 and 21 are completely overlapped. After the fitting, attach a retaining ring 23 to the tip as shown in FIG.

As described above, since the connecting pin 18 is fitted, the operator can confirm the state when the annular projection 12 is not partially fitted in the annular groove 5 and the two pipes 1, 1 are connected. It is possible to prevent fluid leakage due to failure.

In particular, since the tip of the annular projection 12 is a curved surface, the annular projection 12 can be smoothly fitted into the annular groove 5. Moreover, since the annular groove 5 is also formed in a substantially V-shape in cross section and both side surfaces are inclined surfaces, even if the annular protrusion 12 and the annular groove 5 are relatively positioned in the axial direction, If a part of the annular projection 12 fits into the annular groove 5, the remaining other part of the annular projection 12 can be easily fitted into the annular groove 5.

Furthermore, since the annular groove 5 is formed in a substantially V shape in cross section, even if the joint main body 2 is relatively slightly displaced after being mounted on the tubular body 1, it is easily corrected automatically. Furthermore, in the connected state, the annular wall 10 is also in a state of being inserted into the recessed portion 11, so that reliable sealing characteristics can be obtained. In particular, since the stopper wall 7 of the annular seal member 3 abuts both opening end faces la, la, the sealing property of the joint P is further enhanced, and the corrosion of the opening end face 1a can be prevented.

Moreover, since the pressing projection 16 of the joint body 2 presses the outer peripheral surface 15 of the annular seal member 3 toward the tubular body 1, even if the outer peripheral surface 4 of the end of the tubular body 1 is flawed in the axial direction, The annular wall 10 of the inner peripheral surface 6 is elastically deformed by the pressing force of the pressing projection 16 and enters the flaw, so that leakage of fluid from the flaw can be reliably prevented. In particular, since the pressing protrusion 16 is provided on the outer peripheral side corresponding to the annular wall 10, the pressing force by the pressing protrusion 16 effectively acts on the annular wall 10. In the present embodiment, the pressing projection 16 is provided on the joint body 2 side, but it is also possible to provide the pressing projection on the outer peripheral surface 15 of the annular seal member 3. In this way, the connecting operation of the two pipes 1 and 1 is completed. However, in the connected state, the ends of the annular projections 12 of the joint body 2 are curved, so that the two pipes 1 and 1 are connected by an earthquake or the like. Even if the joint body 2 is tilted with the fulcrum as a fulcrum, or vibrates in a direction perpendicular to the axial direction, the tip of the annular projection 12 always contacts the entire circumference of the bottom 5a of the annular groove 5 following the inclination. I can connect. Therefore, the so-called flexibility of the two pipes 1, 1 at the seam P is increased, and the durability against an earthquake or the like can be further improved as compared with a pipe having a flat tip.

In addition, the joint structure according to the present invention is not limited to the type of the tube 1, and can be used for connecting an elbow pipe as shown in FIG. 8 to a T-shaped pipe as shown in FIG. It can be used for connection of various pipes 1 such as a thin stainless steel pipe as shown in FIG. 15 and an inner lining treatment as shown in FIG. In the thin-walled tubular body 1 as shown in FIG. 15, the annular groove 5 can be formed not by cutting but by radially expanding or reducing the diameter. That is, the tube according to the present invention includes a T-shaped tube and the like in addition to the straight tube, and includes not only a thick-walled tube but also a thin-walled tube.

In general, when forming an annular groove in a thin-walled tube, a processing method in which the tube is partially plastically deformed by pressing a tool against the outer peripheral surface, that is, a so-called grooving process is employed. Used. Therefore, in the case of a steel pipe having a relatively low hardness, for example, a groove can be easily formed even in an annular groove having a rectangular cross section. However, in the case of pipes of high hardness such as stainless steel pipes and titanium pipes, an extremely high pressing force is required, and in stainless steel pipes, the high pressing force causes corrosion near the annular groove after processing. May occur. Moreover, both sides in the axial direction from the annular groove are warped outward, and the diameter of the opening end face is particularly large or irregular in many cases.

However, when the annular groove 5 is substantially V-shaped in cross section as described above, there is an advantage that the pressing force at the time of the groove processing is small, corrosion after the processing is prevented, and accurate groove processing can be performed. .

On the other hand, in order to connect the inner lining treated tube 1 as shown in Fig. 13, in general, in order to prevent the opening end surface 1a from being corroded, an anticorrosion core made of synthetic resin is generally placed over the opening and attached. . However, as shown in FIGS. 13 and 14, the end of the stopper wall 7 of the annular seal member 3 extends in both axial directions, and the extended portion 29 contacts the inner peripheral surface of the tube 1. The contact makes the anticorrosion core unnecessary.

As described above, the design of the annular seal member 3 can be appropriately changed according to the purpose and the like, and the shape and the number of the annular wall 10 and the concave portion 11 can also be changed. In addition, a configuration in which the stopper wall 7 is not provided with the annular wall 10 as shown in FIG. 16 or a configuration in which the stopper wall 7 itself is not provided can be adopted. Member 3 can also be used.

Further, as described above, for connecting the inner lining treated pipe 1, the amount of protrusion of the stopper wall 7 is made substantially equal to the wall thickness of the pipe 1 as shown in FIG. The portion may be slightly tapered and thick, and the above-mentioned extended portion 29 may be omitted. In addition, the number and shape of the arc-shaped members 17 (for example, the shape of the tip of the annular projection 12) can be appropriately changed in design.

For example, as shown in FIG. 18 and FIG. 19, the joint body 2 may be composed of six arcuate members 17 in a six-part shape. Further, as a means for preventing the connection pin 18 from coming out of the connection hole 21, one end as described above may be formed in a trumpet shape, or Various configurations other than mounting the retaining ring 23 can be adopted. Since a radial force acts on the connecting pin 18, the connecting pin 18 can be adhered as shown in FIG. 19 to prevent the connecting pin 18 from coming off.

It should be noted that the thickness of the tubular body 1 is also thickened only at the ends, and the thickness is adjusted so that the bottom 5 a of the annular groove 5 is substantially flush with the outer peripheral surface of the other portion of the tubular body 1. It is effective from the viewpoint of securing.

Claims

The scope of the claims

1. Open end faces (la, la) of both pipes (1, 1, 1) face each other to connect a pair of pipes (1, 1, 1) having an annular groove (5) on the outer peripheral surface (4) of the ends. Is attached to both pipes (1, 1) so as to cover the joint (P) over the entire circumference, and the end of the pipe (1, 1) contacts the entire circumference of the bottom (5 a) of the annular groove (5). ), A joint body (2) having an annular protrusion (12) fitted therein, and an inner peripheral surface (14) between the annular protrusions (12, 12) of the joint body (2). An annular sealing member (3) mounted between the outer peripheral surfaces (4, 4) of the two pipes (1, 1) to seal the joint (P);

The joint body (2) includes a plurality of arc-shaped members (17) each having a connection hole (21) formed in the axial direction at both ends in the circumferential direction, and the arc-shaped member (17). The circumferential ends of are overlapped with each other, and the connecting pin (18) is fitted into the two overlapping connecting holes (21, 21), and the connecting pin (18) is used to form a plurality of arcs. The members (17) are connected to each other to form an annular shape and to be attached to both pipes (1, 1).

When the annular projections (12) are fitted into the annular grooves (5, 5), the connecting holes (21, 21) are overlapped, and the connecting pin (18) can be fitted. 8) The fitting is characterized in that it is possible to confirm that the annular projections (12, 12) are fitted into both annular grooves (5, 5) by the fitting of the fittings.

2. An annular pressing projection (16) is formed on the inner peripheral surface (14) between the two annular projections (12, 12) or on the outer peripheral surface (15) of the annular sealing member (3). The pipe joint according to claim 1, wherein

3. The pipe joint according to claim 1, wherein a tip of the annular projection (12) is a curved surface.

4. A pipe connected by the pipe joint according to any one of claims 1 to 3, wherein an annular groove (5) formed in an outer peripheral surface (4) of the end is substantially V-shaped in cross section. A tubular body characterized in that a bottom (5a) of the annular groove (5) is formed in a curved surface or a flat shape.