JPH071071B2 - Detachment prevention fitting - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a separation prevention fitting.

2. Description of the Related Art Conventionally, the insertion opening of the other pipe is inserted into the receiving opening of one pipe, and the annular sealing material is compressed between the inner peripheral surface of the opening end of the receiving opening and the outer peripheral surface of the insertion opening. So-called mechanical joints have been proposed. In such a mechanical joint, a lock ring is fitted in a groove formed on the inner peripheral surface of the receiving opening, and a backup ring engaging with the lock ring backs up the end of the sealing material on the inner side of the receiving opening. Further, an insertion opening projection is formed on the outer periphery of the tip of the insertion opening, and the insertion opening projection engages with the lock ring to prevent separation between the receiving insertion openings.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention When joining the receiving opening and the insertion opening of a mechanical joint having such a separation prevention structure to each other, due to the structure, first, the insertion opening and the receiving opening are first inserted, and then the receiving opening is inserted. It is necessary to fit the lock ring into the groove and install the backup ring by using the gap between the insert and the insertion slot. When fitting the lock ring into the groove, reduce the diameter of this lock ring to the vicinity of the outer peripheral surface of the insertion slot with an appropriate jig, and pass through the gap between the receiving slot while maintaining this reduced diameter state, Then, it is necessary to release the reduced diameter state at the position of the groove portion and expand the diameter toward this groove portion. Therefore, there is a problem that the joining work requires a great deal of labor and a special jig must be used.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a mechanical type disconnection prevention 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 portion on the inner circumference of a receiving opening, and gradually shrinks toward the receiving opening opening end on the inner circumference of the receiving opening end side of the groove portion. A taper surface that forms a diameter is formed, and in the groove portion, a plurality of lock pieces are arranged in the circumferential direction, and an outer peripheral portion of the taper surface is in contact with the lock piece. A notch for accommodating the outer edge portion of the lock piece on the back side of the receptacle is formed on the inner periphery of the lock piece, and the lock piece is held inward in the radial direction and on the opening end side of the receptacle. An elastic ring that presses the outer peripheral portion of the elastic ring against the tapered surface is inserted, and a gap is formed between the outer periphery of the elastic ring and the bottom of the groove portion. The elastic ring when inserting the mouth into the mouth By pushing and expanding the lock piece to the outer peripheral side against the pressing force, it is possible to pass through the position of this lock piece and at the same time, the insertion protrusion that engages with the lock piece when the ejection force acts between the insertion opening. Part is formed.

Action In such a structure, when joining the joint,
First, the elastic ring is fitted into the groove portion of the receiving port, and subsequently, the plurality of lock pieces are arranged in the groove portion, and each lock piece is held in the groove portion by the pressing force of the elastic ring. When the insertion opening is inserted into the receiving opening in this state, the insertion opening projection pushes the lock piece toward the outer peripheral side against the pressing force of the elastic ring, thereby passing through the position of the lock piece. At this time, since a gap is formed between the outer periphery of the elastic ring and the bottom of the groove, the elastic ring is expanded so as to fill this gap,
Therefore, the push-out of the lock piece to the outer peripheral side by the insertion opening projection can be favorably performed without any trouble. After the protrusion of the insertion opening has passed, the lock piece is pressed against the tapered surface by the elastic ring, and is pressed toward the inner peripheral side by the action of the tapered surface to be crimped to the outer peripheral surface of the insertion opening.

When the ejection force acts between the receiving opening and the insertion opening, the insertion opening protrusion engages with the lock piece. At this time, since the lock piece is held in the groove, the insertion opening is prevented from slipping out of the receiving opening. Even if a stronger ejection force is exerted, the lock piece is pressed against the outer surface of the insertion opening by the action of the taper surface, so that the reliable separation preventing function is maintained.

Embodiment In FIGS. 1 and 2, a receiving opening 1 is formed at one end of the tube, and an insertion opening 2 insertable into the receiving opening 1 is formed at the end of the other tube. Has been done. A flange 3 is formed on the outer circumference of the opening end of the receiving opening 1, and a sealing material pressure contact surface 4 is formed on the inner circumference of the opening end, the diameter of which is gradually reduced toward the rear side of the receiving opening. An annular backup portion 5 having a diameter smaller than that of the seal material pressure contact surface 4 is formed at a position continuous with the seal material pressure contact surface 4.

An annular groove portion 6 is formed on the back side of the receptacle with respect to the backup portion 5. At the inner periphery of the groove portion 6 on the side of the receiving opening end, a taper surface 7 is gradually reduced in diameter toward the receiving opening end.
Are formed. Further, a side surface 8 on the opening end side is formed in a portion continuous with the tapered surface 7, and a back side surface 9 is formed on the opposite side of the side surface 8.

A second taper surface 10 that gradually expands in diameter toward the rear side of the receiving port is provided in a portion farther from the groove portion 6, and the second taper surface.
A rear end face 11 continuing from 10 is formed.

A tapered tip outer peripheral surface 12 is formed on the insertion opening 2, and an annular insertion projection 13 having a diameter larger than that of the tubular body portion is formed subsequent to the tip outer peripheral surface 12.

A plurality of lock pieces 14 and an annular elastic ring 15 are fitted in the groove portion 6 in the circumferential direction. Lock piece 14
As shown in FIG. 2, adjacent ones are arranged with a proper gap 16 therebetween, and an outer taper surface 17 capable of contacting the taper surface 7 of the groove 6 is formed on the outer periphery of the receiving opening end side. Has been done. In addition, an inner tapered surface 18 that can come into contact with the outer peripheral surface 12 of the distal end of the insertion opening 2 is provided on the inner periphery of the lock piece 14 on the opening side of the receiving opening.
Are formed. The elastic ring 15 is arranged on the inner side and the outer side in the radial direction of the lock piece 14, and
A notch 19 is formed on the inner periphery of the groove 6 so as to be capable of contacting the inner side surface 9 of the groove 6 and for accommodating the outer edge of the lock piece 14 on the inner side of the receiving port. A gap 23 is formed between the outer circumference of the elastic ring 15 and the bottom of the groove 6.

An annular rubber seal material 20 is disposed between the seal material pressure contact surface 4 and the outer surface of the insertion port 2. This sealing material 20
It is pressed by a push wheel 22 fixed to the flange 3 of the receiving port 1 by the T-head bolt 21, and thereby compressed between the receiving port insertion ports.

In such a configuration, when the receiving opening 1 and the insertion opening 2 are connected to each other, the elastic ring 15 is first fitted into the groove portion 6 and brought into contact with the side surface 9 on the back side. Next, each lock piece 14 is fitted in the groove portion 6 and engaged with the cutout portion 19 of the elastic ring 15, and the outer tapered surface 17 thereof 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,
As a result, the groove 6 is retained.

In this state, when the insertion port 2 is inserted into the receiving port 1, the insertion port 2
The outer peripheral surface 12 of the tip of the abuts against the inner tapered surface 18 of the lock piece 14. Then, as shown in FIG. 3, the lock piece 14 is spread outwardly against the pressing force of the elastic ring 15,
As a result, the insertion protrusion 13 can pass through this position. At this time, a gap is formed between the outer circumference of the elastic ring 15 and the bottom of the groove portion 6.
Since 23 is formed, the elastic ring 15 expands so as to fill the gap 23 as shown in FIG. For this reason, the push-out of the lock piece 14 to the outer peripheral side by the insertion opening projection 13 can be favorably performed without any trouble. After passing through the insertion opening projection 13, the lock piece 14 is pushed back to the inner peripheral side by the action of the elastic ring 15. In addition, from FIG.
If the inner tapered surface 18 is formed on the lock piece 14 as shown in FIG. 3, the above-described pushing and expanding action can be easily performed.
Even if the inner tapered surface is not formed as shown in the figure, the insertion opening 2
It is possible to perform the expanding operation only by the outer peripheral surface 12 of the tip of the.

When the insertion protrusion 13 passes, the lock piece 14 becomes an elastic ring.
By the action of the taper surface 7 based on the pressing force of 15, the inner surface is pressed again and the outer surface of the insertion slot 2 is crimped as shown in FIG.

Next, fit the sealing material 20 between the receiving and inserting ports, and insert the T-head bolt 21
When the sealing material 20 is pressed by the pressing wheel 22 and the pressing wheel 22, the sealing material 20 is compressed between the pressing wheel 22 and the backup portion 5, thereby sealing the space between the receiving openings.

When the ejection force is exerted between the receiving and inserting openings, the inserting opening projection 13 engages with the lock piece 14 held in the groove 6 as shown in FIG. . When a stronger ejection force is applied from this state, the lock piece 14 is pressed against the outer surface of the insertion slot 2 by a larger force by the action of the tapered surface 7. Therefore, the lock piece 14 and the insertion protrusion
The engagement with 13 is strengthened, and the reliable function of preventing separation is maintained.

As is clear from FIG. 5 and FIG. 1, the distal end portion of the insertion opening 2 is movable in the pipe axis direction between the lock piece 14 and the rear end surface 11 of the receiving opening 1. Therefore, the joint in this range is Can be expanded and contracted. In addition, as shown in FIG.
The joint can be bent within a range in which 13 hits the second tapered surface 10. Therefore, this pipe joint is particularly suitable for use as an earthquake-resistant pipe joint.

When disassembling the joint, push the lock piece 14 toward the inner and outer sides of the receiving port by inserting a rod or plate into the gap between the receiving port 1 and the insertion port 2, The engagement between the lock piece 14 and the insertion opening projection 13 may be released, and the insertion opening 2 may be pulled out from the receiving opening 1.

EFFECTS OF THE INVENTION As described above, according to the present invention, simply inserting the insertion slot into the receptacle while holding the lock piece in the groove of the receptacle in advance causes the insertion protrusion to resist the elastic force of the elastic ring. Then, the lock piece can be pushed and expanded to enter the receiving port back side of this lock piece, and at that time, since a gap is formed between the outer periphery of the elastic ring and the bottom of the groove, the elastic ring The diameter of the lock piece is enlarged so as to fill this gap, and therefore the push-out of the lock piece to the outer peripheral side by the insertion opening projection can be performed satisfactorily without any hindrance. Since it can be pushed back to the inner peripheral side as it is, and the desired detachment preventing function can be obtained, the joining work can be performed easily and without using a special jig.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of a separation prevention pipe joint according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of the pipe joint, and FIG. 3 is a view for explaining a joint joining work. FIG. 4 is a vertical cross-sectional view of the main part of the pipe joint, 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 for explaining the separation prevention function. . 1 ... Receptacle, 2 ... Insert, 6 ... Groove, 7 ... Tapered surface, 13 ... Insert protrusion, 14 ... Lock piece, 15 ... Elastic ring.

Claims (1)

[Claims] 1. A pipe joint constructed by inserting the insertion opening of the other tube into the inside of the receiving opening of one pipe, wherein a groove is formed inside the receiving opening, and the receiving opening end of the groove is formed. On the inner circumference of the side, a taper surface that gradually decreases in diameter toward the receiving opening end is formed, and a plurality of circumferentially arranged lock pieces are provided in the groove portion, and a lock piece that can contact the taper surface, and this lock. The lock piece is arranged on the inner side and the outer side in the radial direction with respect to the piece, and a cutout portion for accommodating the outer edge portion of the lock piece on the inner side of the mouth is formed on the inner circumference, and the lock piece is arranged in the radial direction. An elastic ring, which is held inward and pressed toward the receiving opening end side to press its outer peripheral portion against the tapered surface, is inserted, and a gap is formed between the outer peripheral portion of the elastic ring and the bottom of the groove portion. Then, insert the insertion opening into the receiving opening at the outer periphery of the tip of the insertion opening. The lock piece can pass through the position of the elastic ring by pushing and expanding the lock piece toward the outer peripheral side against the pressing force of the elastic ring, and the lock piece is acted when the ejection force is applied between the receiving and inserting ports. A disconnection prevention pipe joint, characterized in that an insertion port protrusion that engages with the pipe is formed.