JPH0139987Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to a conductive pipe joint.

Prior Art In conduits through which electrical wires such as telephone lines are passed, conductive pipes such as cast iron pipes are used to prevent harmful induced currents from being generated in the internal wires. It is also necessary that one pipe and the other pipe in the pipe joint are electrically connected to each other. For this reason, in the conventional technique shown in Utility Application No. 59-97835, as shown in FIGS. , the heel portion 4 of this sealing material 3
A device in which a conductive chip 5 is integrally formed to cover the outer surface of the device has been proposed. The conductive chip 5 is brought into pressure contact with the inner surface of the socket 1 and the outer surface of the socket 2 as the sealing material 3 is compressed, thereby establishing electrical continuity between the socket and the socket.

However, in such a conventional configuration, if water floods up to just before the sealing material 3 in the socket 1 when the conduit is buried underground, there is a risk that the conductive chip 5 will be corroded by the water flooding. There is a problem with this.

Problems to be Solved by the Invention The present invention attempts to prevent corrosion of conductive chips due to water intrusion.

Means for Solving the Problems The present invention forms a socket at one end of a conductive pipe, and a socket inserted into the socket at the other end of another conductive pipe. forming an annular sealing material pressing surface on the inner surface of the socket, press-fitting an annular first sealing material between the sealing material pressing surface and the outer surface of the socket; a plurality of circumferentially conductive chips are integrally formed with the first sealing material to cover the outer surface of the heel portion of the sealing material and to provide electrical conduction between the sealing material pressure contact surface and the outer surface of the insertion port; There is a second annular ring between the sealing material pressure contact surface and the outer surface of the socket on the side closer to the opening end of the socket than the material.
The sealing material is press-fitted.

Effect According to the above configuration, the second sealing material can prevent water from entering from outside the tube toward the first sealing material, and therefore can prevent this water from coming into contact with the conductive chip. This makes it possible to prevent corrosion.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In FIG. 1, 11 is a socket formed at one end of a conductive tube, and 12 is a socket formed at the other end of another conductive tube connected to the tube. These pipes are manufactured by centrifugal casting using ductile cast iron. On the inner surface of the socket 11, in order from the open end, there is an inner flange 13 and a sealing material pressure contact surface 15 having an annular projection 14 in the tube axis direction.
is formed.

Between the sealing material pressure contact surface 15 and the socket outer surface 16, there is an annular first sealing material 17 that engages with the annular projection 14, and a first sealing material 17 located closer to the socket opening end than the first sealing material 17. An annular second sealing material 18 is press-fitted therein. As shown in FIGS. 2a and 2b, the first sealing material 17 has a heel portion 19 formed of hard rubber to engage with the annular protrusion 14 and positioning the sealing material 17, and a heel portion 19 that is subjected to compressive deformation. In order to perform a sealing function, the valve part 20 is formed integrally with a valve part 20 made of soft rubber. At a plurality of positions in the circumferential direction of the heel portion 19, conductive chips 21 made of copper are provided, which cover the outer surface of the heel portion 19 and contact the sealing material pressure contact surface 15 and the outer surface 16 of the socket.
are integrally formed.

The second sealing material 18 is arranged between the first sealing material 17 and the inner flange 13. The second sealing material 18 is made of rubber having a hardness comparable to that of the valve portion 20 of the first sealing material 17, and as shown in FIG. It has a heel part 22 which is held between the pipes, and a fin part 23 in the radial direction of the tube. The fin portion 23 is formed thin, so that the socket 1 of the socket 12
When inserted into the tube 1, the tube is deformed in the tube axis direction, and the elastic force based on this deformation brings it into close contact with the outer surface 16 of the insertion port, thereby exerting the desired sealing function. Moreover, since it is thin, the resistance during insertion of the socket 12 can be reduced, and dimensional tolerances of the socket 12 can be easily accommodated.

Note that although the first sealing material 17 and the second sealing material 18 are shown as separate bodies in the above, a structure in which both the sealing materials 17 and 18 are bonded together with an adhesive or the like and integrated is also possible. Good too.

In such a configuration, when joining the joint part, the first and second sealing materials 1 are inserted into the socket 11.
It is only necessary to insert the socket 12 with the parts 7 and 18 left in place, and the work can be done easily.

By inserting the insertion port 12, the first sealant 17 is compressed between the sealing material pressure contact surface 15 and the outer surface 16 of the insertion port, and the joint portion is sealed. At the same time, the conductive chip 21 is pressed against the sealing material pressure contact surface 15 and the outer surface 16 of the receptacle, thereby establishing electrical continuity between the receptacles. Note that the part that the chip 21 comes into contact with is
For continuity, it is necessary to leave it unpainted or coated with conductive paint.

When the receptacle 12 is inserted, the second sealing material 18 is also compressed, and the space between the receptacles on the receptacle opening end side than the first sealing material 17 is sealed. This can prevent water from entering the first sealing material 17 from outside the tube, and can prevent corrosion of the conductive chip 21.

Figures 4a and 4b show another embodiment of the present invention. That is, in the case shown in FIGS. 1 and 3 described above, the second seal material 18 is applied not only between the seal material pressure contact surface 15 and the outer surface 16 of the socket, but also between the inner surface of the inner flange 13 and the outer surface of the socket. 16, but the second sealing material 18 in this example is configured to be press-fitting only between the sealing material pressure contact surface 15 and the outer surface 16 of the insertion port. This arrangement has the disadvantage that the fin portion 23 is shorter than those shown in FIGS. 1 and 3, but has the advantage that the cross-sectional shape of the sealing material 18 can be simplified.

Effects of the Device As described above, according to the present invention, the action of the second sealing material can prevent water from entering the first sealing material from outside the pipe, thereby preventing this water from coming into contact with the conductive chip. Therefore, it is possible to prevent corrosion of conductive chips.

[Brief explanation of drawings]

Figure 1 is a sectional view of one embodiment of the present invention, Figures 2a and b are detailed views of the first sealing material, and Figure 3 is the second sealing material.
FIGS. 4a and 4b are sectional views of another embodiment of the present invention, and FIGS. 5a and 5b are sectional views of a conventional example. DESCRIPTION OF SYMBOLS 11...Socket, 12...Socket, 15...Seal material pressure contact surface, 16...Socket outer surface, 17...First seal material, 18...Second seal material, 21...Conductive chip , 22... heel part, 23... fin part.

Claims (1)

[Claims for Utility Model Registration] A socket is formed at one end of a conductive pipe, and an insertion port inserted into the socket is formed at the other end of another conductive pipe. , forming an annular seal material pressure contact surface on the inner surface of the socket, press-fitting an annular first seal material between the seal material pressure contact surface and the outer surface of the insertion port; A plurality of circumferential conductive chips are integrally formed with the first sealing material to cover the outer surface of the heel portion and provide conduction between the sealing material pressure contact surface and the outer surface of the insertion port, A ring-shaped second
A conductive pipe joint characterized by having a pressure-fitted sealing material.