JPS5950289A - Pipe joint - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipe joint used for connecting pipes for transporting fuel gas. It is something.

The pipe joint used to connect the fuel gas piping includes a threaded connection type pipe joint and a pipe joint body that engages with a thread pre-engraved on the pipe, and a press ring that engages with the pipe joint body.
A mechanical device comprising one or more gaskets inserted into the space formed by the inner surface of the pipe joint body and the outer periphery of the pipe, and an annular member such as a retainer or a retaining ring that holds a retainer or a member for preventing pipe removal. However, when the above-mentioned mechanical connection type pipe joints are connected to indoor gas piping, the annular member such as the retainer or the retaining ring that holds the retainer to prevent the pipe from being pulled out may be burnt out in the event of a fire. Gas leakage may cause secondary disasters.

As a conventional technology to prevent the above problems,
Publication No. 7-6863 describes a pipe joint in which a refractory airtight filler is provided between the right circular circumferential surface of the press ring and the outer circumferential surface of the tube body.

However, in the above-mentioned conventional technology, even if the refractory airtight filler interposed between the right circular circumferential surface of the press ring and the outer circumferential surface of the tube body is tightened through the press ring, it is not pressed against the outer circumferential surface of the tube body, so it is not airtight at room temperature. The performance was low, and the airtight performance was also weakened when the fireproof airtight filler expanded during a fire.

To explain this in further detail, Figure 1 shows the
This shows the mechanical joint described in Japanese Patent No. 863, in which a refractory airtight filler 9 is provided between the right circular circumferential surface 11 of the pusher 2 and the outer periphery of the pipe 3. Therefore, the packing 4 and ring 5 provided between the pipe joint body 1 and the pipe 3 are tightened by the threaded part 8 at the press ring 2, and by tightening the press ring 2, the packing 4 is compressed and the 41i structure exhibits airtightness. It has become.

In addition, by tightening the press ring 2, the retaining member 7 provided on the taper part lO of the inner circumferential surface of the press ring 2 can be inserted into the pipe 3). Since there is a parallel portion 11 on the inner surface of the pipe 3, a gap is actually created between the refractory airtight filling member 9 and the outer circumferential surface of the pipe 3, thereby eliminating airtightness. Further, even when the fireproof airtight filler 9 expands in the event of a fire, there is a large gap between the outer peripheral surface of the tube 3 and the parallel portion 11 of the inner surface of the press ring 2, so that the filling rate is weakened.

The present invention eliminates the drawbacks of the prior art, improves the airtight performance at room temperature, and provides a fire-resistant airtight filler in the event of a fire;
The purpose of this is to improve the airtight performance when the pipe is covered with a steel sheet.

The present invention forms a taper that becomes smaller in diameter toward the inner side of the push ring on the inner circumferential surface of the end of the push ring of the mechanical connection type pipe joint on the side of the joint body, so that the refractory airtight filler tapers as it tightens the push ring. - It is compressed along the lines to provide good airtight performance at room temperature) Also, in the event of a fire, the filling rate when the fireproof airtight filling material expands can be increased, preventing gas leakage even if other combustible materials are burned down. This is so that it can be prevented.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 2 shows a mechanical joint in which a tapered part 10 is formed on the inner circumferential surface of the end of the press ring 2 on the side of the joint body 1, and the taper part 10 becomes smaller in diameter toward the inside of the press ring 2, and a refractory airtight filler 9 is provided therein. An embodiment of the invention is shown.

The function of compressing the gasket 4 to provide airtightness is the same as that of the structure shown in FIG. 1 above.

Then, in order to compress the packing 4, the push ring 2 is attached to the threaded portion 8.
When tightened, the refractory airtight filler 9 is pressed by the ring 5 and compressed along the tapered part 10 of the inner peripheral surface of the press ring 2, maintaining airtightness even at room temperature. The refractory airtight filler 9 is compressed in the inner peripheral surface tapered part 10, and the refractory airtight filler 9 escapes to the small diameter side of the inner peripheral surface taper part 10. It is pushed toward the smaller diameter side and firmly pressed against the outer surface of the tube 3, thereby producing a pull-out prevention function. Further, the same effect can be obtained when the removal preventing member 7 is embedded in the refractory airtight filler 9.

Furthermore, even when the fireproof airtight filler 9 expands in the event of a fire, since it is pressed against the pipe 3 from the beginning, the filling rate will not be weakened, and a high degree of fire resistance can be achieved.

As described above, the present invention can strongly exhibit airtight performance both at room temperature and in the event of a fire, and its value in terms of social safety is extremely large.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional mechanical joint, and FIG. 2 is a sectional view showing an embodiment of the present invention. l: Pipe joint body, 2: Pressed candy, 3: Pipe, 4: Packing, 5
: Ring, 7: Ring, 8: Threaded part, 9: Fireproof airtight filler, 10: Part of taper on inner peripheral surface of press ring

Claims (1)

[Claims] It includes a pipe joint body, a push ring that engages with the pipe joint body, and one or more annular members inserted into a space formed by the inner surface of the pipe joint body and the outer periphery of the pipe, and the annular member has at least a packing ring. , In a pipe joint that is a fireproof airtight filling material for a ring and a material to prevent pipe removal f■, a part of the taper that becomes smaller in diameter toward the inside of the push ring is formed on the inner circumferential surface of the end of the push ring on the side of the joint body. A pipe master who is characterized by the fact that he