JPS6017593Y2 - Earthquake resistant pipe fittings - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an earthquake-resistant pipe joint.

As an earthquake-resistant pipe joint, a lock ring with a diameter-expanding force is fitted into an annular groove formed at a position farther back than the sealing material on the inner periphery of the socket, and a lock ring with a diameter-expanding force is fitted to the inner periphery of the lock ring from the back side in the pipe axis direction. A protrusion that can be fitted is provided on the outer periphery of the tip of the receptacle, and the receptacle is connected between the position where the protrusion engages the lock ring and the position where the tip of the receptacle engages with the stepped surface at the back end of the receptacle. The applicant has previously proposed a device that does not allow relative movement between the sockets, but prevents the sockets from separating from the sockets by engaging the protrusion with a lock ring.

However, in the above configuration, the radial thickness of the lock ring, that is, the cross-sectional height, is quite large, so linear operation when fitting the lock ring into the annular groove is difficult, and the lock ring is not plastically deformed. There is also a risk that it will not fit completely into the annular groove.

Furthermore, when fitting the lock ring, the lock ring is press-fitted along the seal seat surface formed on the inner periphery of the socket opening end that tapers toward the back of the socket. There are problems such as damage to the

It is also possible to make the lock ring thinner and increase the cross-sectional height of the protrusion on the outer periphery of the socket, but in that case, the sealing material and its backup ring can be passed over this protrusion and placed on the outer periphery of the socket. It becomes difficult to fit.

The present invention aims to provide an earthquake-resistant pipe joint that can solve these problems.

In order to achieve this objective distantly, the present invention includes a receptacle, a receptacle inserted into the receptacle, a protrusion protruding from the outer periphery of the tip of the receptacle, and an inner periphery of the opening end of the receptacle. A seal material is interposed between the seat surface and the outer periphery of the socket, and the seal material is placed in contact with the back side of the socket, and the outer periphery is tapered toward the back side of the socket. a backup ring formed with a conical tapered surface, and a diameter expanding urging force that engages with the conical tapered surface of the backup ring from the back side of the socket and whose outer circumferential portion is fitted into an annular groove formed on the inner periphery of the socket. a first lock ring that is fitted to the inner periphery of the socket so as to engage with the inner periphery of the first lock ring from the back side of the socket, and the protrusion is fitted on the inner periphery from the back side of the socket. a second lock ring having a diameter expansion biasing force that can be engaged from the inside, and a press ring that presses the sealing material toward the back of the socket and is composed of a pair of half bodies divided into two in the circumferential direction. It is equipped with the following.

With such a device, a first lock ring that fits into the annular groove on the inner periphery of the socket and a second lock ring that fits inside the inner periphery of the socket and engages with the first lock ring are provided. Since the protrusion on the outer periphery of the socket engages with the second lock ring, separation of the socket and socket can be reliably prevented even if the cross-sectional heights of the first and second lock rings are low. Since the cross-sectional height of the upper double-ended snap ring can be lowered, the cross-sectional modulus is reduced, so the diameter can be reduced easily, there is no fear of plastic deformation, and there is no damage to the seal seat surface during installation.

Further, since the second lock ring is configured to have a diameter expansion biasing force, it can easily fit over the protrusion and fit into the insertion port when joining the pipes.

Furthermore, since the push ring is divided into two in the circumferential direction, even if the protrusion of the socket is made high, the inner periphery of the push ring can be fitted close to the outer periphery of the socket, and as a result, the sealing material can be applied evenly. This means that it can be pressed.

In addition, since the backup ring is formed with a conical taper surface and engaged with the first lock ring, the first lock ring does not unexpectedly contract in diameter and come off from the annular groove.
A stable withdrawal prevention function can be obtained.

An embodiment of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a socket, on the inner periphery of the open end of the socket, there is formed a seal seating surface 2 that tapers toward the back of the socket, and an annular groove 3 is formed on the inner periphery of the socket at a slight interval on the back side. is formed, and a back end stepped surface 4 is formed at the innermost end of the socket at an appropriate distance from this annular groove 3.

Reference numeral 5 denotes a socket flange which projects from the outer periphery of the open end of the socket 1, and has insertion holes 6 for fastening T-shaped bolts drilled at a plurality of locations in the circumferential direction of the socket flange.

Reference numeral 7 indicates a socket inserted into the receptacle 1, and numeral 8 indicates a protrusion protruding from the outer periphery of the tip of the socket, and the protrusion 8 is formed by welding a ring.

Reference numeral 9 denotes a sealing material interposed between the seal seat surface 2 and the outer periphery of the insertion lower, and 10 denotes a press ring 10 that is disposed externally on the insertion lower so as to face the socket flange 5.

An insertion hole 11 is bored in the press ring 10 in correspondence with the insertion hole 6 of the socket flange 5, and a T-bolt 12 and a nut 13 for fastening are inserted across both the insertion holes 6 and 11 to secure the socket flange. By fastening the press ring 10 to the press ring 10, the sealing material 9 is pressed toward the back of the socket to maintain airtightness between the socket and the socket.

Reference numeral 14 denotes a backup ring that comes into contact with the end surface of the sealing material 9 on the back side of the socket to prevent the sealing material 9 from moving to the back side of the socket, and is configured in one piece in the circumferential direction and has a diameter reduction. It is fitted onto the insertion lower by force, and a conical tapered surface 15 is formed on its outer periphery, which tapers toward the back side of the socket.

Further, the divided portion of the backup ring 14 is inclined in the circumferential direction to prevent the sealing material 9 from protruding into the divided portion.

Reference numeral 16 denotes a first lock ring whose outer circumferential portion is fitted into and secured to the annular groove 3 on the inner circumference of the socket 2, which is divided into one piece in the circumferential direction and is pressed against the bottom of the annular groove by its diameter expansion biasing force. .

The inner periphery of the end of the first lock ring 16 on the socket opening side is
A tapered surface 17 that engages with the conical tapered surface 15 of the backup ring 14 and corresponds to the conical tapered surface 15.
is formed.

Reference numeral 18 denotes a second lock ring split in the circumferential direction and fitted into the inner periphery of the socket 1 in a press-contact state by its diameter expansion biasing force, the outer periphery of which is attached to the inner periphery of the first lock ring 16. The protrusion 8 of the insertion lower can be engaged with the inner peripheral portion from the back side of the socket.

゛As shown in Fig. 2, the press ring 10 is divided into two halves in the circumferential direction and consists of a pair of halves 20a and 20b, and the connecting portion of both halves is a thin overlapping portion 21a that overlaps in the tube axis direction. ,
21b, and the insertion hole 11 is bored through the overlapping portions 21a and 21b.

By dividing into two in this way, even if the protrusion 8 is made high, the press ring 10 can be fitted externally so that the inner periphery is located close to the outer periphery of the socket, and the sealing material 9 can be evenly pressed, and the divided portion can be easily connected.

Further, a split end portion 16a of the first lock ring 16,
As shown in FIG. 3, a cutout recess 19 for engagement with a diameter reduction device is provided on the side surface of the socket 16b on the side of the socket opening.

In the above configuration, when a force that causes the socket 1 and the insertion lower to move relative to each other is applied, the protrusion 8 of the insertion lower engages with the second lock ring 18, or the tip of the insertion lower moves to the back of the socket. Relative movement between the two is allowed until they engage with the end step surface 4, during which time airtightness is maintained by the sealing material 9.

When the insertion lower is removed from the socket 1, the protrusion 8 of the insertion lower engages with the second lock ring 18, and this second lock ring 18 is received via the first lock ring 17. Mouth 1
By engaging with the annular groove 3, the socket 1 and the insertion lower engage with each other and are prevented from being pulled out.

Also, the first lock ring 16 is the backup ring 1.
Since it is engaged with the conical tapered surface 15 of No. 4, it will not unexpectedly contract in diameter and come off from the annular groove 3, and the detachment prevention function can be stably obtained.

Furthermore, the lock ring is connected to the first lock ring 16 and the second lock ring.
Since the lock ring 18 is made up of two lock rings 18, each of the lock rings 18 has a low cross-sectional height and a small section modulus, so it is easy to elastically reduce the diameter, and there is no fear of plastic deformation.

Furthermore, there is no risk of damaging the sealing material seating surface 2 when these lock rings 16, 18 are attached.

To connect the socket 1 and the insertion lower, fit the sealing material 9 and the backup ring 14 on the outer periphery of the insertion lower beyond the protrusion 8, loosely fit the first and second lock rings 16 and 18, and then This insertion lower is inserted into the socket 1.

Next, the second lock ring 18 is press-fitted along the seal seat surface 2 through the gap between the two and placed at a position further back than the annular groove 3 on the inner periphery of the socket 1, and then the first lock ring 16 is inserted into the receiving part. Press fit into the inner periphery of the mouth 1 along the seal seating surface 2 and fit into the annular groove 3, then insert the backup ring 14 and sealing material 9 into the gap, and fit the push ring 10 around the outer periphery of the insertion lower. The connection is completed by fastening the press ring and the socket flange 5 using T-shaped bolts 12.

According to the earthquake-resistant pipe joint of the present invention, as is clear from the above description, there is a first lock ring that fits into the annular groove on the inner periphery of the socket, and a lock ring that fits inside the inner periphery of the socket and engages with the first lock ring. A matching second lock ring is provided so that the protrusion on the outer periphery of the socket
Since the first and second lock rings are engaged with each other,
Even if the cross-sectional height of the lock ring is low, it is possible to reliably prevent separation of the receptacle and insertion port, and by lowering the cross-sectional height of the double-end lock ring, the cross-sectional modulus is reduced, so the diameter can be reduced easily. There is no fear of plastic deformation, and there is no damage to the seal seating surface during installation.

Further, since the second lock ring is configured to have a diameter expansion biasing force, it can easily fit over the protrusion and fit into the insertion port when joining the pipes.

Furthermore, since the push ring is divided into two in the circumferential direction, even if the protrusion of the socket is made high, the inner periphery of the push ring can be fitted close to the outer periphery of the socket, and as a result, the sealing material can be applied evenly. This means that it can be pressed.

In addition, since the backup ring is formed with a conical taper surface and engaged with the first lock ring, the first lock ring does not shrink in diameter and come out of the annular groove.
Detachment prevention function can be stably obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, FIG. 1 is a longitudinal sectional view, FIG. 2 is a longitudinal sectional view of the push ring at different positions, and FIG.
shows the structure of the split end of the lock ring, a is a front view,
b is a plan view. 1...Socket, 2...Seal seat, 3.
...Annular groove, 4...Socket back end stepped surface, 7.
...Insertion port, 8...Protrusion, 9...
Seal material, 10...Press ring, 14...Backup ring, 15...Conical tapered surface, 1
6...First lock ring, 18...
Second lock ring.

Claims (1)

[Scope of utility model registration request] A receptacle, a receptacle inserted into the receptacle, a protrusion protruding from the outer periphery of the tip of the receptacle, a recessed seal seat formed on the inner periphery of the opening end of the receptacle, and the receptacle. a sealing material interposed between the outer periphery of the mouth; a backup ring disposed in contact with the back side of the socket of the sealing material and having a conical tapered surface tapered toward the back side of the socket on the outer periphery; a first lock ring having a diameter expansion biasing force that engages with the conical tapered surface of the backup ring from the back side of the socket and whose outer peripheral portion fits into and engages with an annular groove formed on the inner periphery of the socket; The lock ring is fitted onto the inner periphery of the socket so as to engage with the inner periphery of the lock ring from the back side of the socket, and has a diameter expanding biasing force on the inner periphery that allows the protrusion to be secured from the back side of the socket. 1. An earthquake-resistant pipe joint comprising: a second lock ring; and a press ring that presses the sealing material toward the back of the socket.