JPS6017590Y2 - Disengagement prevention pipe fitting - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a detachment prevention pipe joint.

To prevent separation between the receptacle and the socket, a lock ring is fitted into an annular groove formed on the inner surface of the receptacle, and a protrusion that can be secured to the lock ring is provided on the outer surface of the receptacle. The use of devices is already known.

In addition, there is already known a seismic-resistant pipe joint that uses the above-mentioned separation prevention device to allow relative movement within a certain range in the pipe axis direction between the socket and the insertion port, and has an earthquake-resistant function that prevents eventual separation. There is.

By the way, conventionally, the pipe body used for the breakaway prevention pipe fitting that has this seismic function and the pipe body used for the breakaway prevention pipe joint that restrains the relative movement between the socket and the inlet have to be manufactured separately, and the production and This required extra administrative costs and effort.

In view of the above-mentioned problems, the purpose of the present invention is to obtain a separation prevention pipe joint that restrains relative movement between a socket and an inlet by using a pipe body that is applied to a separation prevention pipe joint that has an earthquake-resistant function. .

For this reason, the present invention provides a socket, a socket inserted into the socket, and a sealing material interposed between the outwardly expanding sealing surface formed on the inner periphery of the opening end of the socket and the outer curved surface of the socket. A sealing material, a press ring that presses the sealing material toward the back of the socket, and a lock that is fitted and secured into an annular groove formed on the inner surface of the socket and located on the back of the socket from the sealing material seating surface. a ring, a protrusion provided on the outer surface of the socket that engages with the lock ring from the back side of the socket in the direction of the tube axis, and a protrusion that is interposed between the tip of the socket and the step surface on the back end of the inner surface of the socket and that engages the lock ring in the direction of the tube axis. It is equipped with a ring body to which an adjustment bolt is screwed on the direction-side surface.

With such a configuration, relative movement between the socket and the socket is achieved by the engagement between the lock ring and the protrusion and by the ring body having the adjustment bolt interposed between the socket tip and the stepped surface at the back end of the socket. can be restrained, and the pipe body for earthquake-resistant pipe joints can be used for this kind of detachment prevention pipe joint.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 is a socket, and 2 is a socket inserted into the socket 1.

A sealing material bearing surface 3 that tapers toward the back of the socket is formed on the inner periphery of the open end of the socket 1, and an appropriate gap is provided between the sealing material seating surface 3 and the outer surface of the socket 2 on the back side of the socket. It is continuous with the cylindrical inner surface 4 of the socket which is fitted externally.

This cylindrical inner surface 4 has a considerable length in the tube axis direction, and the back end of the socket is continuous with a step surface 5 at the back end of the socket that extends radially inward.

Reference numeral 6 denotes an annular groove formed in the vicinity of the sealing material seat surface 3 of the cylindrical inner surface 4, in which a lock ring 7 that can be expanded and contracted at one location in the circumferential direction is accommodated and engaged.

That is, the lock ring 7 is accommodated in the annular groove 6 in its diameter-expanded state, and its inner circumference fits into the outer surface of the insertion port 2 and its outer circumference engages with the annular groove 6 in its diameter-reduced state.

Reference numeral 7a denotes a locking member fitted into the split portion of the lock ring 7 to maintain its reduced diameter state.

Reference numeral 8 denotes a protrusion provided on the outer periphery at or near the tip of the socket 2, which engages with the lock ring 7 in the reduced diameter state in the tube axis direction from the back side of the socket, and prevents the insertion from the socket 1. Preventing the withdrawal of 2.

Reference numeral 9 denotes a sealing material consisting of a rubber ring interposed between the sealing material seat surface 3 and the outer surface of the socket 2, and a press ring 11 is attached to the outer side surface of the socket via an intermediate ring 10 that is divided into two parts in the circumferential direction. It is in contact.

This push ring 11 is pressed toward the back side of the socket 1 by a bolt 13 and a nut 14 screwed into a screw hole 12 formed in the end face of the socket 1.

Reference numeral 15 denotes a backup ring of a sealing material interposed between the sealing material 9 and the lock ring 7.

The length of the cylindrical inner surface 4 is determined by the distance between the side surface of the annular groove 6 on the back side of the socket and the step surface 5 at the back end of the socket, and the distance between the engagement surface of the protrusion 8 with the lock ring 7 and the socket. The distance is set to be the sum of the distance between the two tips 2a and the allowable relative movement distance between the sockets and the sockets.

Therefore, when the protrusion 8 and the lock ring 7 are engaged,
A gap corresponding to the permissible relative movement distance between the socket sockets is created between the socket tip 2a and the stepped surface 5 at the rear end of the socket.

Reference numeral 16 denotes a ring body disposed in this gap, and a plurality of adjustment bolts 17 for length adjustment are screwed in the circumferential direction on the side surface of the ring body on the back side of the socket.

When joining the above configuration, the ring body 16 with the length of the adjustment bolt 17 adjusted is inserted into the deep part of the socket 1, and the lock ring 7 is accommodated in the annular groove 6 in an enlarged diameter state. On the other hand, press ring 11 is placed on the outer surface of insertion port 2. The sealing material 9 and backup ring 15 are kept in storage.

Next, the insertion port 2 is inserted into the socket 1, and the diameter of the lock ring 7 is reduced through the gap between the sealing material seat surface 3 and the outer surface of the insertion port 2, and the reduced diameter state is maintained by the locking member 7a. Next, the backup ring 15 and the sealing material 9 are pushed in, the intermediate ring 10 is brought into contact with the side surface of the sealing material 9, the pressing ring 11 is brought into contact with this intermediate ring 10, and the pressing ring 11 is brought into contact with the intermediate ring 10.
Fasten with bolts 13 and nuts 14.

Then, the sealing material 9 is compressed by the pressing force of the press ring 11, and the desired sealing pressure is generated to obtain a reliable seal. The socket 1 of the socket 2 is blocked by the engagement of the part 8.
Movement toward the back side is prevented because the receptacle tip 2a and the receptacle rear end stepped surface 5 engage with each other via the ring body 16 and the adjustment bolt 17, and the receptacles 1 and 2 are prevented from moving relative to each other. It is engaged and fixed to prevent it from happening.

According to the detachment prevention pipe joint of the present invention, as is clear from the above explanation, the lock ring and the protrusion engage with each other, and the intermediate part has an adjustment bolt interposed between the tip of the socket and the step surface at the back end of the socket. Relative movement between the socket and the insertion port can be restrained by the ring body, and the pipe body for earthquake-resistant pipe joints can be used in this type of separation prevention pipe joint.

[Brief explanation of the drawing]

The drawing is a longitudinal side view showing an embodiment of the present invention. 1... socket, 2... insertion, 3...
...Seal material bearing surface, 5...Socket back end stepped surface, 6.
...Annular groove, 7...Lock ring, end...
... Protrusion, 9 ... Seal material, 10 ...
...Middle ring, 11...Press ring, 16...
...Ring body, 17...Adjustment bolt.

Claims (1)

[Scope of utility model registration request] a socket, a socket inserted into the socket, a sealing material interposed between the outwardly expanding sealing material seat formed on the inner periphery of the opening end of the socket and the outer peripheral surface of the socket; A press ring that presses the sealing material toward the back of the socket, a lock ring that is fitted into and engaged with an annular groove formed on the inner surface of the socket and located on the back of the socket from the sealing material seating surface, and a socket. A protrusion that is provided on the outer surface and engages with the lock ring from the back side of the socket in the tube axis direction, and a protrusion that is interposed between the tip of the socket and the step surface on the back end of the inside of the socket and adjusts between the tube axis direction and the side surface. A detachment prevention pipe joint characterized by comprising a ring body into which a bolt is threaded.