JPS639829Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to split-type insulating joints including continuous insulating joints.

[Conventional technology]

Including permanent insulating joints used when cutting existing glass pipes while gas is still flowing and insulating them electrically, taking out branch pipes, or cutting pipes using bypass construction methods, etc. Split type insulating joints are often used as pipe joints, in which pipes are joined by joining a pair of joint members that are split in one direction.

A conventional split-type insulating joint has a plastic electrical insulation sheet and an end gasket housed in the tube-contacting inner circumference of a split-type pipe joint body consisting of a pair of joint members divided in the axial direction. It was a split press ring bolted to both ends of the pipe joint body, and the end gasket was tightened to the pipe.

[Problem that the invention attempts to solve]

Such conventional split-type insulation joints are unsafe because they do not have a special mechanism to prevent pipes from coming out, and because electrical insulation is achieved by incorporating an electrical insulation sheet, special work is required for electrical insulation. There were drawbacks such as the need for

The present invention was developed to eliminate these drawbacks; no special work is required for electrical insulation, and electrical insulation can be achieved reliably by simply assembling it.
Another object of the present invention is to provide a split-type insulating joint that can reliably prevent pipes from being pulled out and is highly safe.

[Means for solving problems]

In order to achieve the above object, the split insulated joint of the present invention is a split insulated joint which is formed by joining a pair of axially split joint members with a gasket inserted between the joint members to enclose the joint portion of the pipes to be joined, and in this split insulated joint, an electrical insulating layer is applied to the inner circumferential surfaces of each of the pair of joint members, end gaskets are accommodated in the enlarged openings at both ends of each of the joint members, and split press rings having grooves recessed radially outward on the inner circumferential surfaces are bolted to both ends of the pair of joint members,
A tube slip-out prevention mechanism is disposed in the groove of the split press ring via a split electrically insulating sleeve that fits along the groove-shaped surface, and this tube slip-out prevention mechanism has a split metal retaining ring having a tapered surface on its inner surface that gradually expands in diameter toward the coupling member, and a metal biting member that is disposed between the tapered surface of the split retaining ring and the tube and bites into the tube by penetrating deep into the tapered surface, and the split retaining ring is fitted into the groove of the split press ring via the split electrically insulating sleeve.

〔Example〕

Hereinafter, an explanation will be given based on an example in which the split type insulation joint according to the present invention is adopted as a continuous insulation joint.

In the figure, 1 is a gas pipe, 2 is a pipe joint body, and the pipe joint body 2 consists of an upper half member 3 and a lower half member 4, which are a pair of joint members divided in the axial direction. - Joined with nuts.
An electrically insulating layer, such as a plastic layer 5, of a required thickness is coated on the inner circumferential surface of the pipe joint body 2, that is, on the inner surfaces of the upper and lower half members 3, 4. In addition, a tube cutting cutter insertion hole 6 is provided in the center of the upper half member 3.
A tube cutting chamber 7 is provided in the center of the lower half member 4. In addition, side gaskets 8 are inserted into the flange joints of the upper and lower half members 3 and 4, and
End gaskets 9 are housed in tapered enlarged openings provided at both ends of the upper and lower half members 3 and 4. With this structure, the pipe joint main body 2 can embrace the joint portion of the pipe 1 to be connected with the flange joint portion sealed.

A split press ring 1 having a substantially L-shaped cross section is provided at both ends of the pipe joint body 2, that is, at each end of the upper and lower half members 3 and 4.
0 are each fixed by bolts 11, and the end gasket 9 is tightened into the widened portions at both ends of the joint body 2 via an insulating retainer 12 by means of the split push ring 10. In addition, this split press ring 1
A groove recessed in the radially outward direction is formed in the inner circumferential portion of the groove. A pipe retaining mechanism 14 is disposed in this groove via a split electrically insulating sleeve 13 that extends along the groove-shaped surface. The pipe removal prevention mechanism 14 includes a split-type retaining ring 15 made of metal and having a tapered surface that gradually increases in diameter toward the split-type pipe joint body 2, that is, the upper and lower half members 3 and 4, on the inner peripheral surface. , a metal biting member 16' that is disposed between the tapered surface of the split retaining ring 15 and the gas pipe 1 and bites into the outer circumference of the gas pipe 1 by penetrating deep into the tapered surface. The split retaining ring 15 is fitted into the groove of the split press ring 10 via the split electrical insulating sleeve 13. In addition,
The steel ball serving as the biting member 16' is attached to a rubber ring 1.
6, a plurality of them are embedded and held at predetermined intervals. Therefore, if the gas pipe 1 is subjected to a pulling force in the direction of detachment due to an earthquake or ground subsidence, the biting member 16' moves together with the gas pipe 1 in the direction of detachment, and the split metal retaining ring The biting member 1 penetrates into the depths of the tapered surface of
6' bites into the outer periphery of the gas pipe 1 to prevent the gas pipe 1 from coming off.

In this case, even if a relatively large pulling force is applied to the gas pipe 1, the split electrical insulating sleeve 13 will not be damaged, and the biting member 16' will bite into the gas pipe 1 as desired. Reliably prevents it from slipping out. That is, when the biting member 16' is brought into direct contact with the split-type electrical insulating sleeve 13, the biting member 16' bites into the split-type electrically insulating sleeve 13 side, and the biting into the gas pipe 1 becomes insufficient. ,
The ability to prevent the gas pipe 1 from coming off is significantly reduced. Furthermore, if it bites into the split type electrical insulating sleeve 13, the sleeve 13 will be damaged, and depending on the pulling force of the gas pipe 1, the biting member 16' will reach the groove surface of the split type push ring 10, destroying the electrical insulation. This will result in a situation where you will be exposed. On the other hand, when the metal split retaining ring 15 is fitted into the groove of the split press ring 10 via the split electrical insulating sleeve 13, the biting member 16' fits into the split metal retaining ring 15. Therefore, biting in the radial direction is prevented, and the retaining ring 1
5, the biting member 16' steadily bites into the gas pipe 1. Further, the split type electrical insulating sleeve 13 is not subjected to the local pressing force of the biting member 16' due to the split type retaining ring 15, but is supported by the entire portion disposed in the groove of the press ring 10. Therefore, even if a large pulling force is applied to the gas pipe 1 (and even if this pulling force occurs repeatedly), the gas pipe can be reliably prevented from being pulled out, and the electrical insulation will not be destroyed.

Note that the end gasket 9, retainer 12, and rubber ring 16 have slits 9a, 12a, and 16a, respectively, as shown in FIGS. 4 to 6, for example.
It can be opened and closed through the

Moreover, as shown in FIG. 8, for example, the joint body 2
A rubber ring 18 is provided around the bolt insertion hole 17 on the flange 4a of the lower half member 4, so that, for example, a bolt 19 inserted from below can be held by frictional force without falling out.

Further, as shown in FIG. 9, for example, the upper part of the side gasket 8 is narrow, and a required gap is provided in the groove 20 of the flange 4a of the lower half member 4 that accommodates the side gasket 8. Therefore, there is no protrusion from the groove 20, and there is no risk of damage to the protruding portion during clamping. At the same time, regardless of the diameter of the gas pipe 1, the fitting surface of the pipe joint body 2 is provided with a slight gap c so as to contact the parallel inner surface of the main body and eliminate bending of the pipe.

Furthermore, in order to assist the sealing effect of the end gasket 9, an annular groove 21 is provided on the inner circumferential surface of the pipe fitting body 2 on the center side of the end. An auxiliary gasket 22 shown in FIG. 1 is loaded as necessary.
The auxiliary gasket 22 is, for example, of a split type, with a mating portion having a fitting and sealing structure, and an inner circumferential surface, that is, a sealing surface for the gas pipe 1, having a two-stage chevron shape.

With such a configuration, when the gas pipe 1 is insulated without interruption, the required cutting portion of the gas pipe 1 can be connected to the gaskets 8 and 9 and the pipe extractor from the top and bottom using the split pipe joint body 2. If the gas pipe 1 is cut with a cutter (not shown) inserted into the cutter insertion hole 6 for cutting the pipe, and then the hole 6 is closed with a plug or the like 23, the gas pipe 1 can be placed in a flowing state. It can be electrically insulated as it is.

In the above embodiment, the biting member 16' of the pipe removal prevention mechanism 14 is made of a steel ball, but various modifications can be made, such as using a biting member having a biting edge and a square cross section. Of course.

In addition, although the above-mentioned embodiment shows an example in which the present invention is applied to a continuous insulation joint, the present invention can also be applied to a split-type insulation joint that is simply a joint that does not have a pipe cutting cutter insertion hole, etc. It goes without saying that the present invention can be applied not only to the horizontally arranged gas pipe 1 as shown in the embodiment, but also to vertically arranged gas pipes, and to pipes other than gas pipes.

[Functions and effects of the invention]

As is clear from the above explanation, according to the split type insulating joint according to the present invention, an electrically insulating layer, such as a plastic layer, is coated on the inner circumferential surfaces of a pair of joint members, so that it is not necessary to use an electrically insulating sheet as in the conventional method. Electrical insulation can be ensured simply by assembling the pipe joint body, without the need for extra work to assemble the pipe fittings.

In addition, a split metal retaining ring with a tapered inner surface is inserted through a split electrical insulating sleeve into the groove formed in the inner periphery of the push ring for tightening the end gasket at both ends of the pipe fitting body. Since the biting member is placed between the tapered surface of the split retaining ring and the pipe, even if a relatively large pull-out force is applied to the pipe, the split metal retaining ring will not disturb the pipe. The biting member bits into the pipe without damaging the split electrical insulating sleeve and effectively prevents the pipe from being pulled out. For this reason, when the pipe is a gas pipe, safety can be dramatically improved compared to conventional pipes, and damage to the split electrical insulating sleeve caused by the biting member is prevented, resulting in a stable state over a long period of time. can ensure electrical insulation.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a front view partially shown in section, Fig. 2 is a side view partially shown in section, and Fig. 3 is a plan view partially shown in section. , FIGS. 4 to 6 are half sectional views showing the component structure, FIG. 7 is a side view of the same, FIGS. 8 and 9 are sectional views showing the partial structure, and FIG. 10 is the component structure. The front view and FIG. 11 are side views partially shown in cross section. 2...Pipe joint body, 5...Electric insulation layer, 9...
End gasket, 10... Split press ring, 11...
Bolt, 13... Split type insulation sleeve, 14...
Pipe removal prevention mechanism, 15...Split type retaining ring, 1
6'... Biting member.

Claims (1)

[Claims for Utility Model Registration] By joining a pair of joint members divided in the axial direction by inserting a gasket into the joining part,
In a split-type insulated joint that covers the joint portion of pipes to be joined, an electrically insulating layer is applied to each inner circumferential surface of the pair of joint members, and end portions are attached to the enlarged openings at both ends of each joint member. A split press ring that accommodates a gasket and has a groove recessed in the radially outward direction on its inner circumference is bolted to both ends of the pair of joint members, and a split press ring that accommodates a gasket and has a groove recessed in the radially outward direction is bolted to each end of the pair of joint members, and a split press ring that accommodates a gasket is attached to the groove of the split press ring along the groove-shaped surface. A tube pull-out prevention mechanism is arranged through a shaped electrically insulating sleeve, and this tube pull-out prevention mechanism is made of a metal split-type retainer having a tapered surface that gradually expands in diameter toward the joint member on its inner circumferential surface. a ring, and a metal biting member that bites into the tube by penetrating deep into the tapered surface disposed between the tapered surface of the split retaining ring and the tube; A split-type insulating joint, characterized in that a split-type retaining ring is fitted into a groove of a split-type push ring via the split-type electrically insulating sleeve.