JPH0227274Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a split type pipe joint that can sufficiently prevent pipes from being pulled out and pushed in.

In recent years, split-type mechanical pipe joints for the purpose of insulation, such as uninterrupted insulation pipe joints, have come into widespread use. This type of split pipe fitting is
Generally, an appropriate tube pull-out prevention mechanism is provided on the inner circumference near both axial ends of the split-type joint body to prevent the tube from being easily pulled out even if a force in the pull-out direction is applied to the tube. There is no mechanism to prevent the tube from being pushed in at all, so when a force in the pushing direction is applied to the tube, the tube is easily pushed in, causing the problem that both tubes come into contact with each other inside the fitting and fail to perform their insulating function. It was hot.

This invention was made in view of such problems,
The object of the present invention is to provide a split type pipe joint that can sufficiently prevent the pipe from being pulled out or pushed in.

That is, in order to achieve the above object, the split type pipe joint of the present invention includes a split type joint body having an electrically insulating layer on the inner circumferential surface surrounding the separated pipes, and a split type joint body having an electrically insulating layer on the inner circumferential surface surrounding the separated pipes, and a split type joint body having an electrically insulating layer on the inner circumferential surface surrounding the separated pipes, and a portion near both axial ends of the joint body. A truncated cone is fitted into a circumferential groove formed on the inner circumferential portion of the insulating layer, overlapping the inner surface of the electrically insulating layer therein, and the inner circumferential surface has a truncated cone tapering toward both ends in the axial direction. an annular biting effect member forming first and second tapered surfaces;
These biting bodies are disposed between the inner circumferential surfaces of the biting bodies and the tube, and when the tube moves in the drawing direction, they move together with the tube and bit into the tube by the first tapered surfaces of the biting bodies. When the tube moves in the pushing direction, the tube moves together with the tube and bites into the tube with the second tapered surface of the biting effecting body, so that it does not come into contact with the other tube that is separated. It is equipped with an annular bite body that restricts movement.

Hereinafter, the split type pipe joint of the present invention will be described in detail by way of examples.

FIG. 1 is a one-sided cutaway front view of an embodiment of the present invention, and FIG. 2 is a one-sided cutaway plan view of the same embodiment.

That is, in FIGS. 1 and 2, 1 is the joint upper half body 2
It is a split type joint main body consisting of a lower joint half body 3, and both side flange parts 4, 4 of the joint upper half body 2 and both side flange parts 5, 5 of the joint lower half body 3 are overlapped with each other and are secured by bolts 6. The parts are tightened and fixed. An electrically insulating layer 7 made of, for example, a plastic layer is adhered to the inner peripheral surfaces of the upper joint half 2 and the lower joint half 3, and the upper joint half 2
An opening 8 is formed in the center of the joint for inserting a hole saw for cutting the pipe, a magnet for removing cutting waste, etc., and a chamber 9 for cutting the pipe is formed in the center of the lower joint half body 3. .

A circumferential groove is formed in the inner peripheral part of the split joint body 1 near both ends in the axial direction, and an annular biting effector is formed in this groove, overlapping with the electrical insulating layer 7 inside the groove. 10 is held inside,
Furthermore, an annular biting body 11 is fitted into contact with the inner peripheral surface of this biting effecting body 10. The biting effecting body 10 is composed of an upper and lower halves of a ring as shown in FIG. A surface 12 and a second tapered surface 13 are respectively formed. In this embodiment, the biting body 11 is composed of an annular ball belt in which a plurality of balls 11a are arranged and held at equal intervals in a row as shown in FIG. It is said that it can be expanded freely. In the normal state, as shown in the fifth enlarged view, each ball 1
1a is in pressure contact with the flat surface portion between the first tapered surface 12 and the second tapered surface 13 on the inner peripheral surface of the biting effecting body 10, and the ball 11a is made of a soft tube A.
Biting into the surface of the hard material 1
It is configured so that it does not reach 0. The ball belt serving as the biting body 11 may be a ball belt in which a plurality of balls 11a are arranged and held in double rows in a staggered manner as shown in FIG. 4B.

As described above, the biting action body 10 and the biting body 1
An annular gasket 14 is fitted and held in the inner peripheral part of the joint body 1 closer to the center than the joint body 1, and is in close contact with the surface of the pipe A, and both side flange parts 5, 5 of the joint lower half body 3 of the joint body 1 A band-shaped gasket 15 is embedded in the gasket, and both ends thereof are in close contact with the annular gasket 14. Thus, the joint body 1 is kept airtight and no fluid leakage occurs.

16 is a removable plug that closes the opening 8;
17 is an O-ring provided on the plug 16 to improve airtightness.

The above-mentioned split-type uninterrupted insulation pipe fitting is for pipe A.
The required cut portions are cut into the annular gasket 14, the biting effect member 10, and the biting body 1 by the split type joint body 1.
After the bolt 6 is tightened to prevent fluid leakage, the opening 8 in the upper half of the joint is sealed.
Attach a leakage prevention shutter plate to the tube, cut the tube A with a hole saw inserted inside, separate it, and close the opening 8 with the plug 16 to electrically disconnect the tube A while it is still flowing. However, in this case, if no force is applied to the tube A in the pulling direction or the pushing direction, each ball 11a of the ball belt serving as the biting body 11 will be insulated from the tube A by the tightening force of the bolt 6. It only bites into the surface of tube A a little.
is not firmly fixed. However, tube A
When a force in the pulling direction is applied to the tube A and the tube A moves in the pulling direction, each ball 11a also slides along the first tapered surface 12 of the biting effecting body 10 and bites deeply into the surface of the tube A. Therefore, extraction of the tube A is strongly prevented.

Furthermore, when a force in the pushing direction is applied to the tube A, each ball 11a slides along the second tapered surface 13 of the biting effecting body 10 as the tube A moves, and deeply penetrates the surface of the tube A. Because of this, the pushing of tube A is also strongly prevented, and the tubes A and A that have been cut and separated are
This means that electrical insulation breakdown due to contact between the two can be effectively prevented.

As can be understood from the above explanation, the split-type pipe joint of the present invention includes a split-type joint body that has an electrically insulating layer on the inner circumferential surface that surrounds separated pipes, and a split-type joint body that has an electrically insulating layer on the inner circumferential surface that surrounds separated pipes, and an annular biting effecting body provided on the inner circumferential portion and having first and second tapered surfaces in the shape of a truncated cone tapering toward both ends in the axial direction on the inner circumferential surface; It is disposed between the inner circumferential surface of the body and the tube, moves together with the tube when the tube moves in the pulling direction, and bites into the tube with the first tapered surface of the biting action body to prevent the tube from coming off. an annular ring which moves together with the tube when the tube moves in the pushing direction and restricts the movement of the tube so that the second tapered surface of the biting action body bits into the tube and does not contact the other tube separated from the tube; By providing the biting body, even if a force is applied to the tube in either the pulling direction or the pushing direction, the biting body will cause the biting body to either one of the first and second tapered surfaces of the biting effecting body. It strongly bites into the surface of the tube, sufficiently preventing the tube from being pulled out or pushed in.
Therefore, it is possible to satisfactorily eliminate the disadvantages of the tubes coming off or coming into contact with each other and damaging the electrical insulation. Particularly, in the split type pipe joint of the present invention, the biting action body having the first and second tapered surfaces is located inside the circumferential groove formed on the inner circumference near both axial ends of the joint body. Since the biting body is fitted in an overlapping state with the inner surface of the electrically insulating layer, the biting body contacts the biting effecting body but does not contact the electrically insulating layer. Therefore, even when the tube is prevented from being pulled out or pushed in by the biting body, there is no chance that the electrical insulating layer will come into contact with the biting body and be damaged. The insulation is cut off due to damage to the electrical insulation layer due to contact with the biting body, and one of the tubes - the biting body -
This has the remarkable effect that no electrical circuit is formed that connects the joint body, the biting body, and the other tube partially or completely, and is extremely practical.

[Brief explanation of the drawing]

Fig. 1 is a front view with one side cut away of an embodiment of the present invention, Fig. 2 is a plan view with one side cut away of the same embodiment, Fig. 3 is a partially cutaway side view of the biting action body, and Fig. 4 A and B are respectively shown. FIG. 5 is a partially cutaway side view of the biting body, and is an enlarged view of the main part of FIG. 1. 1... Joint body, 7... Electrical insulation layer, 10...
Biting body, 11', 11... Biting body, 12
...first tapered surface, 13...second tapered surface,
A...Tube.

Claims (1)

[Claims for Utility Model Registration] A split type joint body having an electrically insulating layer on the inner peripheral surface surrounding separated pipes, and a circumferential joint body formed on the inner peripheral part near both ends of the joint body in the axial direction. The groove is fitted and retained in a state overlapping the inner surface of the electrical insulating layer inside the groove, and the inner circumferential surface has first and second tapered surfaces in the shape of a truncated cone that taper toward both ends in the axial direction. The formed annular biting effect members are disposed between the inner circumferential surfaces of these biting effect bodies and the tube, and move together with the tube when the tube moves in the drawing direction to cause the first biting effect body to The tapered surface bites into the tube to prevent the tube from coming off, and when the tube moves in the pushing direction, it moves together with the tube and bites into the tube and separates it by the second tapered surface of the biting action body. A split type pipe joint characterized by comprising an annular bite body that restricts the movement of the pipe so that it does not come into contact with the other pipe.