JPH02203097A - Separation preventing pipe joint - Google Patents

Abstract

PURPOSE:To facilitate connection work by providing in the internal periphery of a pipe accepting port a grooved part forming a tapered surface while inserting a lock piece and an elastic ring and forming an insertion port protrusive part in the point end periphery of an insertion port. CONSTITUTION:In the case of a pipe joint inserting into an accepting port 1 of one pipe and insertion port 2 of the other pipe, a grooved part, having a tapered surface 7 contracting a contour, is formed in the groove part 6 provided in the internal periphery of the accepting port 1. The grooved part 6 inserts a lock piece 14 with the peripheral part able to come into contact with the tapered surface 7 and an elastic ring 15 arranged in a more interior side of the accepting port 1 than the lock piece 14 while forcing it to be press attached to the tapered surface 7. And the insertion port 2 provides in its point end periphery an insertion port protrusive part 13 press spreading the lock piece 14 while engaging with it. As the result, connecting work can be performed easily further with no use of a particular jig.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a detachment prevention pipe joint.

Conventional technology Conventionally, the socket of one pipe was inserted into the socket of the other pipe, and an annular sealing material was compressed between the inner peripheral surface of the opening end of the socket and the outer peripheral surface of the socket. , so-called mechanical joints have been proposed. In such a mechanical joint, a lock ring is fitted into a groove formed on the inner peripheral surface of the socket, and a backup ring that engages with the lock ring backs up the end of the sealing material on the back side of the socket. Further, a socket protrusion is formed on the outer periphery of the tip of the socket, and the socket protrusion engages with the lock ring to prevent separation between the socket sockets.

Problems to be Solved by the Invention When joining the receptacle and socket of a mechanical joint with such a detachment prevention structure to each other, there are problems due to its structure.

First, insert the socket inside the socket, and then use the gap between the socket and the socket to fit the lock ring into the groove.
It is necessary to install a backup ring. When fitting the lock ring into the groove, use a suitable jig to reduce the diameter of the lock ring to near the outer circumferential surface of the insertion hole.
It is necessary to pass through the gap between the sockets and sockets while maintaining this reduced diameter state, and then release the reduced diameter state at the groove location and expand the diameter toward this groove.This makes joining work extremely difficult. There are problems in that it requires a lot of effort and requires the use of special jigs.

SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide a mechanical type separation-preventing pipe joint that can be easily joined without using a special jig.

Means for Solving the Problems In order to achieve the above object, the present invention forms a groove on the inner periphery of the socket, and the inner periphery of the groove on the opening end of the socket gradually contracts toward the opening end of the socket. forming a tapered surface having a diameter, and forming a tapered surface in the groove portion;
A plurality of lock pieces are arranged in the circumferential direction, and a lock piece whose outer peripheral part can come into contact with the tapered surface, and a lock piece is arranged on the back side of the socket than the lock piece, and the lock piece is pressed toward the opening end of the socket. and an elastic ring whose outer periphery is crimped to the tapered surface, and is locked onto the outer periphery of the tip of the socket against the pressing force of the elastic ring when the socket is inserted into the socket. It is possible to pass through the position of this lock piece by pushing the piece outward and expanding, and also has a socket protrusion that engages with the lock piece when an extraction force is applied between the socket sockets. .

Function In such a configuration, when joining the joint,
First, an elastic ring is fitted into the groove of the socket, and then a plurality of lock pieces are placed in the groove, and each lock piece is held in the groove by the pressing force of the elastic ring. When the socket is inserted into the socket in this state, the socket protrusion passes through the position of the lock piece by pushing and expanding the lock piece outwardly against the pressing force of the elastic ring. After the socket protrusion has passed, the lock piece is pressed against the tapered surface by the elastic ring, and is pressed inward by the action of this tapered surface, and is pressed against the outer peripheral surface of the socket.

When an ejection force is applied between the socket and the socket, the socket protrusion engages with the lock piece. At this time, the lock piece is held in the groove, so the socket cannot be pulled out any further from the socket. Prevented. Even if a stronger extraction force is exerted, the lock piece is pressed against the outer surface of the socket with even greater force due to the action of the tapered surface, so a reliable detachment prevention function is maintained.

Embodiment In FIGS. 1 and 2, a socket 1 is formed at the end of one tube, and an insertion port 2 that can be inserted into the socket 1 is formed at the end of the other tube. has been done. A flange 3 is formed on the outer periphery of the open end of the socket 1, and a sealing material pressure contact surface 4 whose diameter gradually decreases toward the back of the socket is formed on the inner periphery of this open end. An annular backup portion 5 having a smaller diameter than the sealing material pressing surface 4 is formed at a position continuous with the sealing material pressing surface 4 .

An annular groove portion 6 is formed on the back side of the socket than the backup portion 5. On the inner periphery of the groove 6 on the side of the opening end of the socket, there is a tapered surface 7 whose diameter gradually decreases toward the opening end of the socket.
is formed. Further, a side surface 8 on the opening end side is formed in a portion continuous with the tapered surface 7, and a side surface 9 on the back side is formed on the opposite side of this side surface 8.

A second tapered surface 10 whose diameter gradually increases toward the back side of the socket and a rear end surface 11 continuing from the second tapered surface 10 are formed in a portion deeper than the groove 6.

The insertion port 2 is formed with a tapered tip outer peripheral surface 12, and an annular insertion port protrusion 13 having a larger diameter than the tube body is formed following the tip outer peripheral surface 12.

A plurality of lock pieces 14 and an annular elastic ring 15 are fitted into the groove 6 in the circumferential direction. As shown in FIG. 2, the lock pieces 14 are arranged with a suitable gap 16 between adjacent ones, and the outer periphery of the socket opening end has an outer taper that can come into contact with the tapered surface 7 of the groove 6. Surface 17
is formed. Further, an inner tapered surface 18 that can come into contact with the outer circumferential surface 12 of the distal end of the socket 2 is formed on the inner periphery of the lock piece 14 on the side of the opening end of the socket. The elastic ring 15 is
A notch 19 is formed on the inner periphery of the lock piece 14 so as to be able to contact the side surface 9 on the back side of the groove 6 and to accommodate the outer edge of the lock piece 14 on the back side of the socket.

An annular rubber sealing material 20 is disposed between the sealing material pressure contact surface 4 and the outer surface of the insertion port 2. This sealing material 20
is pressed by a push shaft 22 fixed to the flange 3 of the socket 1 by a single-head bolt 21, and is thereby compressed between the socket sockets.

In such a configuration, when connecting the receptacle 1 and the receptacle 2 to each other, the elastic ring 15 is first fitted into the groove 6 and brought into contact with the inner side surface 9. Next, each lock piece 14
is fitted into the groove 6 and engaged with the notch 19 of the elastic ring 15, and its outer tapered surface 17 is brought into contact with the tapered surface 7. Then, each lock piece 14 is pressed against the tapered surface 7 and the side surface 8 on the opening side by the elastic action of the elastic ring 15, and thereby is held in the groove 6.

When inserting the socket 2 into the socket 1 in this state, the socket 2
The outer peripheral surface 12 of the tip is the inner tapered surface 1 of the lock piece 14
8, and as shown in FIG. 3, the lock piece 14 is pushed outward and expanded outwardly against the pressing force of the elastic ring 15, thereby allowing the socket protrusion 13 to pass through this position. Note that if the lock piece 14 is formed with an inner tapered surface 18 as shown in FIGS. 1 to 3, the above-mentioned pushing and spreading action can be easily performed, but if the inner tapered surface 18 is formed on the lock piece 14 as shown in FIG. Also, it is possible to perform the pushing and spreading operation using only the outer circumferential surface 12 of the tip end of the socket 2.

When the socket protrusion 13 passes, the lock piece 14 is pressed inward again by the action of the tapered surface 7 based on the pressing force of the elastic ring 15, and is pressed against the outer peripheral surface of the socket 2 as shown in FIG. be done.

Next, a sealing material 20 is fitted between the socket sockets, and when this sealing material 20 is pressed with the single-headed bolt 21 and push shaft 22,
This sealing material 20 is compressed between the push shaft 22 and the backup portion 5, thereby sealing the space between the socket and the socket.

When an ejection force is applied between the socket sockets, the socket protrusion 13 engages with the lock piece 14 held in the groove 6 as shown in FIG. 5, so that separation between the socket sockets is prevented. . If a stronger extraction force is applied from this state, the tapered surface 7
Due to this action, the lock piece 14 is pressed against the outer surface of the socket 2 with even greater force. Therefore, the engagement between the lock piece 14 and the socket protrusion 13 becomes strong, and a reliable detachment prevention function is maintained.

As is clear from FIG. 5 and FIG. 1, the tip of the socket 2 is movable in the tube axis direction between the lock piece 14 and the inner end surface 11 of the socket 1, and therefore the joint can be expanded and contracted within this range. is possible. Further, as shown in FIG. 1, the joint can be bent within a range until the socket protrusion 13 contacts the second tapered surface 10. Therefore, this pipe fitting is
It is particularly suitable for use as an earthquake-resistant pipe joint.

When disassembling the joint, insert a bar or plate into the gap between the socket 1 and the socket 2 to remove the lock piece 14.
The lock piece 14 and the socket protrusion 13 can be disengaged from each other by being pushed toward the back side of the socket and towards the outer circumference, and the socket 2 can be pulled out from the socket 1.

Effects of the Invention As described above, according to the present invention, the desired detachment prevention function can be obtained by simply inserting the socket into the socket with the lock piece held in the groove of the socket in advance. , easily and without using special jigs,
Able to perform joining work.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the main parts of a detachment prevention pipe joint according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the main parts of the pipe joint, and Fig. 3 is a cross-sectional view of the main parts of the pipe joint according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of another example of the lock piece, and FIG. 5 is a vertical cross-sectional view of the main part of the pipe joint to explain the separation prevention function. . 1...Socket, 2...Socket, 6...Groove, 7...
Tapered surface. 13... Socket protrusion, 14... Lock piece, 15...
...Elastic ring. Agent Yoshihiro Morimoto Figure 2

Claims (1)

[Scope of Claims] 1. A pipe joint configured by inserting the socket of one pipe into the socket of the other pipe, wherein a groove is formed on the inner periphery of the socket, and a groove in the groove is formed. A tapered surface that gradually reduces in diameter toward the opening end of the socket is formed on the inner periphery of the opening end of the socket, and a plurality of grooves are arranged in the circumferential direction in the groove, and the outer periphery can come into contact with the tapered surface. a lock piece, and an elastic ring that is arranged on the back side of the socket from the lock piece and presses the lock piece toward the opening end of the socket so that its outer peripheral part is pressed against the tapered surface. It is possible to pass through the position of the lock piece by pushing the lock piece outward toward the outer periphery of the tip of the socket against the pressing force of the elastic ring when inserting the socket into the socket. A detachment prevention pipe joint, further comprising a socket protrusion that engages with the lock piece when an extraction force is applied between the socket sockets.