JP2003269666A - Pipe joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a joint work of a pipe in a short period of time and surely provide a sealing performance to a joint part of the pipe. <P>SOLUTION: The outer circumference of a spigot 10 is disposed with a seal material pushing ring 20 contacting a seal material 13 and a push ring 21 contacting the seal material pushing ring 20, and the outer circumference of the seal material pushing ring 20 is formed with a pushing ring tapered surface 22. The push ring 21 is provided with a circumferential division part, a bolt 29 and nut 18 circumferentially narrowing a space formed in the division part by fastening the division part, a claw part 24 being latched with a socket flange 19 by the contraction of the push ring 21 by the bolt 29 and nut 18, and a push ring tapered face 27 contacting with the pushing ring tapered face 22 by the contraction of the push ring 21. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint structure. 2. Description of the Related Art Conventionally, there is a joint structure as shown in FIG. 6 as one of the joint structures of pipes. As shown in FIG. 6, a receiving port 2 is formed at an end of one of the tubes 1, and a deep end face 3 is formed at a deep side of the receiving port 2. [0003] A tapered surface 6 that expands toward the opening side is formed on the opening side of the inner periphery of the receiving port 2. Also,
A plurality of screw holes 8 are formed in the end face 7 of the receiving port 2 in the axial direction at a constant interval in the circumferential direction. On the other hand, an insertion port 10 is formed at the end of the other pipe 9 and is inserted into the receiving port 2 to a predetermined position. On the outer periphery of the insertion port 10 on the opening side of the receiving port 2 with respect to the position of the lock ring 5, a backup ring 12 and an annular rubber sealing material 13 are arranged in the circumferential direction. Also, on the outer periphery of the other pipe 9 at a portion that does not enter the receiving port 2, an annular pressing ring 1 having the same outer diameter as the receiving port 2 is provided.
5 is provided, and a split ring 14 is arranged between the pressing ring 15 and the sealing material 13. A notch 15a is formed in a portion of the pressing ring 15 that comes into contact with the split ring 14 so as to match the shape of the split ring 14, so that the notch 15 can be stably contacted with the split ring 14. A plurality of round holes 16 corresponding to a plurality of screw holes 8 formed in the end face 7 of the receiving port 2 are formed in the pressing ring 15 so as to penetrate therethrough. One end of each of the plurality of bolts 17 is screwed and implanted into a corresponding one of the screw holes 8 formed in the end face 7 of the socket 2.
7, the respective round holes 16 in the pressing wheel 15 are fitted, and the other nuts 18
Are screwed together. The pressing ring 15 presses the split ring 14 toward the inner side of the socket 2 in the pipe axis direction by the tightening force of the bolt 17 and the nut 18, and the split ring 14 is arranged on the outer periphery of the insertion opening 10. Sealing material 13 and backup ring 1
2 is pressed toward the inner side of the receiving port 2 in the pipe axis direction, and the sealing material 13 is strongly pressed against the tapered surface 6 formed in the receiving port 2. Thereby, this pipe joint is provided with a sealing function. However, according to the conventional pipe joint structure, as described above, when the socket 2 and the insertion port 10 are joined, one end of the plurality of bolts 17 is required. Part 2
The screw 17 is screwed into each of the screw holes 8 formed in the end face 7, the respective round holes 16 in the pressing ring 15 are fitted to the respective bolts 17 in this state, and the respective nuts 18 are screwed into the other ends of the respective bolts 17. Matching work is required. As described above, since a plurality of bolts 17 are used for joining the pipes, much time is required for joining the pipes. Accordingly, an object of the present invention is to solve such a problem and to perform a joining operation of pipes in a short time and to surely provide a joint function of a pipe with a sealing function. In order to solve the above-mentioned problems, the invention according to claim 1 is characterized in that a flange is formed radially outward on an outer periphery of an end of a receiving port of one of the pipes. An insertion port of the other pipe is inserted into the receiving port, and an annular sealing material is disposed between the sealing material press-contact surface of the receiving port and the insertion port, and the outer peripheral of the insertion port can contact the sealing material. A contact ring, and a pressing ring that can contact the contact ring, and a first tapered surface having a diameter on an outer periphery of the contact ring on a side remote from the seal material, the diameter of which decreases as the distance from the seal material increases Is formed, the pressing ring is a dividing part that divides the pressing ring in the circumferential direction, and a tightening unit that can narrow the space formed in the dividing part in the circumferential direction by tightening the dividing part; By the fastening means A claw portion, which can be engaged with the flange by reducing the diameter of the pressing ring by narrowing the space formed in the divided portion in the circumferential direction, and a space formed in the divided portion by the fastening means. And a second tapered surface that contacts the first tapered surface and presses the seal material toward the seal material pressure contact surface via the contact ring by being reduced in diameter in a direction to reduce the diameter of the press wheel. Have [0010] According to this configuration, the space formed in the divided portion is narrowed in the circumferential direction by tightening the divided portion by the tightening means, and the entire diameter of the pressing wheel is reduced, so that the claw portion of the pressing wheel is positioned at the socket. The second tapered surface of the pressing ring can be brought into contact with the first tapered surface of the contact ring. Further, when the divided portion of the press ring in this state is further strongly tightened by the tightening means, and the space formed in the divided portion is narrowed in the circumferential direction, the diameter of the press wheel is further reduced from this state. And the first tapered surface of the contact ring tend to shift from each other along the first and second tapered surfaces. However, since the claw portion of the pressing ring is engaged with the flange at the receiving port, the pressing ring cannot be displaced with respect to the contact ring. , The sealing material is shifted while being pressed over its entire circumference. Therefore, since the sealing material is pressed against the sealing material pressing surface by the contact ring, the sealing function can be reliably provided to the joint portion of the pipe. Further, as described above, only by reducing the diameter of the pressing wheel by the tightening means, the tightening force generated by the tightening means is transmitted to the contact ring, and the sealing material is transmitted over the entire circumference by the contact ring to which the tightening force is transmitted. Therefore, the sealing function can be reliably provided to the joint portion of the pipe with a small number of fastening means depending only on the number of the divided portions, and the joining operation of the pipe can be performed in a short time. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe joint structure according to an embodiment of the present invention will be described with reference to FIGS. The term reduced diameter used in this specification refers to a pressing ring having a divided portion in the circumferential direction arranged so as to form a space at the divided portion, and when the divided portion is tightened, the pressing ring itself is substantially formed. When the space is simply narrowed so that the inner diameter does not become smaller without being deformed, or when the divided part of the pressed wheel arranged in the same way as above is deformed so that the pressed wheel narrows this space in the circumferential direction This means that the inner diameter of the pressing wheel itself becomes smaller. FIG. 1 is a sectional view in the pipe axis direction showing a joint structure of a pipe according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of a pressing ring used in FIG. FIG.
FIG. 2 is a sectional view in the tube axis direction showing a state in which a nut is further tightened in FIG. 1. In the embodiment,
The same components as those already described in the conventional pipe joint structure are denoted by the same reference numerals as those used in FIG. 6, and the detailed description thereof will be omitted. As shown in FIGS. 1 and 3, a flange is formed radially outward on an outer periphery of an end of a receiving port 2 of one of the pipes 1 constituting a joint structure of a pipe according to an embodiment of the present invention. A receiving flange 19 is formed. Insertion 1 in socket 2
0 is inserted, and an annular sealing material 13 is provided between the tapered surface 6, which is a sealing material pressing surface of the receiving port 2, and the insertion opening 10.
The seal member pressing ring 20 which is a contact ring capable of contacting the seal member 13 and the pressing ring 21 which can contact the seal member press ring 20 are arranged on the outer periphery of the insertion opening 10. The sealing material pressing ring 20 is
In order to facilitate the arrangement on the outer periphery of the peripheral part, the peripheral part may be formed in a shape having a divided part in the circumferential direction, for example, one divided part in the circumferential direction. A pressing ring tapered surface 22 which is a first tapered surface whose diameter becomes smaller as the distance from the sealing material 13 increases is formed in a portion of the outer periphery of the sealing material pressing ring 20 farther from the sealing material 13. . As shown in FIGS. 1 to 3, the pressing wheel 21 is divided into two parts 23a and 23b for dividing the pressing wheel 21 into two in the circumferential direction.
And a claw portion 24 that can engage with the receiving flange 19;
The press ring taper surface 27 which is a second taper surface which is continuous with the claw portion 24 via the connection portion 28 and can contact the press ring taper surface 22 of the seal member press ring 20.
A pair of press ring flanges 25 and a pair of press ring flanges 25 for each of the divided parts 23a and 23b formed in the vicinity of the divided parts 23a and 23b and extending in the tube axis direction from the end face of the press ring 21 farther from the socket 2; The bolt 2 is a fastening means that is capable of narrowing the space 26 formed in the divided portions 23a and 23b in the circumferential direction by tightening the divided portions 23a and 23b through a round hole 25a formed in
9 and a nut 18. Using the pressing wheel 21 having such a configuration, FIG.
As shown by the phantom line, the pressing ring 21 is fitted to the joint portion of the pipe such that the claw portion 24 of the pressing ring 21 can engage with the receiving flange 19. At this time, a space 26 is formed by the respective divided portions 23a and 23b. The bolt 2 is inserted into the round hole 25a formed in the pressing ring flange 25.
9 and screw the nut 18 to this bolt 29.
The divisions 23a and 23b are tightened. And the pressing wheel 21
Is substantially reduced, the space 26 formed in the divided portions 23a and 23b is simply narrowed in the circumferential direction to reduce the diameter of the pressing wheel 21. Thereafter, the claw portion 24 of the pressing ring 21 is engaged with the receiving flange 19 of the receiving port 2, and the pressing ring tapered surface 27 of the pressing ring 21 is brought into contact with the pressing ring tapered surface 22 of the sealing material pressing ring 20. At this time, the divided portion 2 of the pressing wheel 21 in this state is
3a and 23b are further strongly tightened by bolts 29 and nuts 18, and the space 2 formed in the divided portions 23a and 23b is
6 in the circumferential direction, as shown in FIG.
When the diameter of 1 is reduced from the state shown by the imaginary line to the state shown by the solid line, the pressing contact taper surface 27 of the pressing ring 21 and the pressing ring taper surface 22 of the sealing material pressing ring 20 already contact each other. The pressing ring taper surface 27 or the pressing ring taper surface 22 tends to shift from each other. However, since the claw portion 24 of the pressing ring 21 is engaged with the receiving flange 19 of the receiving port 2, the pressing ring 21 cannot be displaced from the sealing material pressing ring 20. With respect to the pressing wheel 21 toward the tapered surface 6 in the socket 2 in the pipe axis direction.
The sealing material 13 is shifted while being pressed over the entire circumference. Therefore, the sealing material 13 is the sealing material pressing ring 2
Since it is pressed against the tapered surface 6 by 0, a sealing function can be reliably provided to the joint portion of the pipe. Also, as described above, the dividing parts 23a, 23b
Only by reducing the diameter of the pressing ring 21 with a small number of bolts 29 and nuts 18 corresponding to
8 can be transmitted to the sealing material pressing ring 20 and the sealing material 13 can be pressed over the entire circumference by the sealing material pressing ring 20 to which the tightening force has been transmitted. 29 and nut 18
Thus, the sealing function can be reliably provided to the joint portion of the pipe, and the joining operation of the pipe can be performed in a short time. Further, instead of the pressing wheel 21 shown in FIGS. 1 to 3, a pressing wheel 30 as shown in FIGS. 4 and 5 can be used. This pressing wheel 30 is, as shown in the figure,
At a plurality of positions at a certain interval in the circumferential direction in 1,
The structure is such that a digging portion 31 is formed in the tube axis direction such that the claw portion 24 and the pressing wheel taper surface 27 have the same thickness as the connecting portion 28. In order to form a joint portion of a pipe using the pressing ring 30 thus configured, the nut 18 is screwed to the bolt 29 passing through the round hole 25a of the pressing ring flange 25, and the divided sections 23a, 23b Tighten. At this time, since the stealing part 31 is formed in the pressing wheel 30,
When the divided portions 23a and 23b are further tightened from the state where the press ring taper surface 27 is in contact with the press ring taper surface 22, the press ring 30 can be easily deformed in the direction in which the inner diameter becomes smaller and its diameter can be reduced. Therefore, the sealing member pressing ring 20 can be pressed firmly toward the inner side of the receiving port 2 in the tube axis direction. As described above, according to the present invention, the space formed in the divided portion is narrowed in the circumferential direction by tightening the divided portion by the tightening means, and the entire diameter of the pressed wheel is reduced. Hook the claw on the flange at the socket,
Further, the second tapered surface of the pressing ring can be brought into contact with the first tapered surface of the contact ring. Furthermore, by tightening the divided portion of the pressing wheel in this state more strongly by the tightening means, and narrowing the space formed in the divided portion in the circumferential direction,
When the pressing ring is further reduced in diameter from this state, the second tapered surface of the pressing ring and the first tapered surface of the contact ring, which are already in contact, are shifted from each other along the first and second tapered surfaces. To try. However, since the claw portion of the pressing ring is engaged with the flange at the receiving port, the pressing ring cannot be displaced with respect to the contact ring, and the contact ring presses the sealing material at the receiving port in the pipe axis direction with respect to the pressing ring. , The sealing material is shifted while being pressed over its entire circumference. Therefore, since the sealing material is pressed against the sealing material pressing surface by the contact ring, the sealing function can be reliably provided to the joint portion of the pipe. Further, as described above, only by reducing the diameter of the pressing ring by the tightening means, the tightening force generated by the tightening means is transmitted to the contact ring, and the sealing material is transmitted by the contact ring to which the tightening force has been transmitted. Because it can be pressed over the entire circumference, it is possible to reliably provide a sealing function to the joint portion of the pipe with a small number of fastening means depending only on the number of divided parts, and to perform the joining work of the pipe in a short time Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view in the pipe axis direction showing a pipe joint structure according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the pressing wheel in FIG. FIG. 3 is a sectional view in the tube axis direction showing a state where a nut is further tightened in FIG. 1; FIG. 4 is a front view of a pressing wheel having a different shape from the pressing wheel shown in FIGS. FIG. 5 is an exploded perspective view of the pressing wheel in FIG. FIG. 6 is a sectional view in the pipe axis direction showing an example of a joint structure having a seismic function in a conventional technique. [Description of Signs] 1 One pipe 2 Reception port 6 Tapered surface 9 The other pipe 10 Insertion port 13 Seal material 18 Nut 19 Reception flange 20 Seal material pressing ring 21 Press ring 22 Press ring taper surface 23a, 23b Dividing part 24 Claw Part 26 Space 27 Pressing taper surface 29 Bolt

Claims (1)

Claims: 1. A flange is formed radially outward on an outer periphery of an end of a receiving port of one pipe, and an insertion port of the other pipe is inserted into the receiving port. An annular sealing material is arranged between the sealing material pressing surface at the mouth and the insertion opening, and a contact ring that can contact the sealing material and a pressing ring that can contact the contact ring are arranged around the insertion opening. A first tapered surface having a diameter decreasing as the distance from the seal material increases, at a portion of the outer periphery of the contact ring that is farther from the seal material, and the pressing ring divides the pressing ring in a circumferential direction. A dividing part, a tightening means capable of narrowing a space formed in the divided part in the circumferential direction by tightening the divided part, and a space formed in the divided part by the tightening means in a circumferential direction. The pressing wheel is reduced in diameter The first taper is formed by making the claw portion capable of engaging with the flange by being tightened, and the space formed in the divided portion being narrowed in the circumferential direction by the tightening means to reduce the diameter of the pressing ring. A second tapered surface that contacts the surface and presses the sealing material toward the sealing material pressing surface via the contact ring.