JPH11344170A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint excellent in sealing performance and workability. SOLUTION: In a pipe joint sealed and fixed through an annular sealing material 15 by inserting an inserting port pipe 12a into a receiving port pipe 12b, in the case that the external peripheral part of the sealing material 15 is fitted to the receiving port pipe 12b, a lubricative thermal fusing layer 17 is formed at least on the slidable contact surface in the internal circumferential part of the sealing material 15 abutting against the inserting port pipe 12a. In the case that the internal circumferential part of the sealing material 15 is fitted to the inserting port pipe 12a, the lubricative thermal fusing layer 17 is formed at least on the slidable contact surface in the external peripheral part of the sealing member 15 abutting against the receiving port pipe 12b. The lubricative thermal fusing layer 17 is formed by thermally fusing powder type or sheet type polyolefin resin on the slidable contact surface of the sealing material 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to metal, plastic,
Alternatively, the present invention relates to a pipe joint used for piping of concrete pipes.

[0002]

2. Description of the Related Art Conventionally, in plumbing work for sewerage, for example, FIG.
As shown in FIG. 1, a method of connecting the ends of pipes 6 such as a PVC pipe or a fume pipe by a pipe joint 1 having a socket having a reduced diameter is often used. The pipe joint 1 is provided with a sealing material 3 fitted in a concave groove 2 engraved along the circumferential direction on the inner periphery of a socket socket into which the end of the pipe 6 is inserted.
Thus, the outer peripheral surface of the end of the pipe 6 is sealed and fixed. The sealing material 3 is made of a synthetic rubber material, and is formed by integrally molding a cylindrical portion 3a fitted into the concave groove 2 and a funnel-shaped seal lip portion 3b on the inner peripheral side of the cylindrical portion 3a. . Therefore, the end of the pipe 6 inserted into the pipe joint 1 has the seal lip 3
b is sealed and fixed.

[0003]

However, although the seal lip portion 3b has a large bending rigidity when it is closely attached to the pipe 6, the sealing lip portion 3b has a high sealing performance and a high water stopping performance.
The insertion resistance at the end of the pipe 6 was increased, resulting in poor workability. As a countermeasure, a non-hardening lubricant Lb such as grease is applied to the outer peripheral surface of the end of the pipe 6 and the sliding surface of the seal lip portion 3b as shown in FIG. Was reduced. However, in outdoor construction such as burial of sewer pipes, there is a problem that dust, sand, and the like easily adhere to the adhesive lubricant Lb, which significantly impairs the sealing performance and the water stopping property. Then, an object of the present invention is to provide a pipe joint excellent in sealing performance and workability in view of such conventional problems.

[0004]

In order to achieve the above object, according to the present invention, as shown in FIGS. 1 to 11, the outlet pipes 11a, 12a and 13a are connected to the receiving pipes 11b and 1b.
2b, 13b are inserted into the annular sealing material 14, 1
Pipe joints 11, 1 sealed and fixed via 5, 16
2 and 13, the sealing materials 14, 15, 16
Are provided on the outer periphery thereof at the receiving pipes 11b, 12b,
13b, the sealing members 14, 1
5, 16 at least the outlet pipe 11a, 12a,
A lubricating heat-sealing layer 17 is formed on the sliding surface of the inner peripheral portion that abuts on the inner peripheral portion 13a, or the sealing materials 14, 15, 16 are attached to the spigot pipes 11a, 12a, 1
3a, the sealing members 14, 15,
16, at least the receiving pipes 11b, 12b, 13
b, a lubricating heat-sealing layer 17 is formed on a sliding contact surface at an outer peripheral portion in contact with the sealing member 14, 15, and the lubricating heat-sealing layer 17 is made of a powdery or sheet-like polyolefin resin.
It is formed by fusing to 16 sliding contact surfaces.

In addition, the sealing materials 14, 15, 16
Is made of synthetic rubber or a thermoplastic elastomer, and the fitting side to the pipe has cylindrical portions 14a, 15a, 16a.
And a funnel-shaped seal lip portion 14 is formed on the inner peripheral side thereof.
b, 15b, and 16b are integrally formed, or a pipe whose fitting side to the pipe is formed in a substantially brim-like shape, or an O-ring 35 whose cross-sectional shape at the fitting side to the pipe is A bifurcated portion 35a is formed and a small lip 35
b.

Further, a fitting groove 28 extending in a circumferential direction is formed in a portion of the spigot pipe or the receiving pipe where the sealing materials 14, 15, 16 are fitted, or a cylindrical fitting surface 29 is provided. And a locking projection 30 or a step-like enlarged portion is formed. Further, the lubricating heat fusion layer,
It is formed to a thickness of 10 μm to 100 μm.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 3 show a first embodiment of the present invention. In each of the pipe joints 11, 12, and 13, a spigot pipe 11a, 12a, 13a has a different shape of a receiving pipe 11b, 12b, 13b. Each sealing material 1 which is inserted between
4, 15 and 16 are made of synthetic rubber or thermoplastic elastomer, and all of them are receiving pipes 11b, 12b,
A cylindrical portion 14a, 15a, 16a fitted to 13b;
Funnel-shaped seal lip 14 formed on the inner peripheral side
b, 15b, and 16b are substantially common in that they are integrally formed. And each sealing material 14, 1
The lubricating heat-sealing layers 17 are formed on the inner peripheral portions, that is, the sliding contact surfaces, of the seal lip portions 14b, 15b, and 16b, which are in contact with the ends of the spigot pipes 11a, 12a, and 13a, respectively. I have.

The lubricating heat-sealing layer 17 is made of a powdery or sheet-like polyolefin resin.
4, 15 and 16 are heat-sealed to a thickness of 10 μm to 100 μm. The lubricating heat-sealing layer 17 may be a sheet-like film having a uniform thickness, or a film having an uneven shape. The lubricating heat sealing layer 17 is preferably made of, for example, Miberon XM220 (trade name, manufactured by Mitsui Petrochemical Co., Ltd.) (molecular weight: 2,000,000 or more, average particle size: 25 μm to 30 μm).
m) the above-mentioned sealing material 14, 1
After adhering to the sliding surfaces of 5 and 16, 10
The coating was heated for more than one minute and fused to form a coating having a thickness of 10 μm to 100 μm.

Accordingly, the insertion force of the ends of the spigot pipes 11a, 12a, 13a into the seal lip portions 14b, 15b, 16b having the lubricating heat-sealing layer 17 formed on the sliding contact surface is 20 kg or less. A small value is actually measured, and it can be seen that the insertion resistance of the conventional pipe joint shown in FIG. 12 is far less than that of the insertion force of 100 kg or more, and the sealing performance and workability are excellent.

Next, the form of each receiving pipe will be described. That is, as shown in FIG.
A fitting groove 18 along the circumferential direction for fitting the cylindrical portion 14a of the sealing material 14 is formed in the inner periphery of the receiving pipe 11b into which the pipe is inserted. Also, as shown in FIG.
A receiving pipe 12b into which the outlet pipe 12a is inserted.
A cylindrical fitting surface 19a for fitting the cylindrical portion 14a of the sealing material 14 and a locking projection 19b are formed on the inner periphery of the housing. Also, as shown in FIG.
In the receiving pipe 13b into which a is inserted, a step-shaped enlarged portion 20 for fitting the cylindrical portion 14a of the sealing material 14 is formed on the inner periphery.

FIGS. 4 to 6 show a second embodiment of the present invention. Each of the pipe joints 21, 22, 23 has a receiving pipe 2 into which a spigot pipe 21a, 22a, 23a is inserted.
1b, 22b, and 23b, each of the sealing materials 24, 25, and 26 is made of synthetic rubber or a thermoplastic elastomer. They are common in that they are formed. When the sealing members 24, 25 and 26 are inserted, a sliding heat sealing layer 27 is formed on a sliding contact surface which comes into contact with a mating pipe, and the sliding heat sealing layer 27 is formed in the first embodiment. As in the case of the example, a powdery or sheet-like polyolefin resin is thermally fused to the sliding surfaces of the sealing materials 24, 25 and 26, so that the insertion resistance is reduced.

Next, the sealing materials 24, 25,
The form of the spigot or receiving pipe to which 26 is attached will be described. That is, as shown in FIG. 4, the sealing material 24 is fitted in the fitting groove 2 which is recessed along the circumferential direction in the spigot pipe 21a.
5, and a sealing material 25 is fitted to the end of the pipe comprising the cylindrical fitting surface 29 and the locking projection 30 of the spigot pipe 21a, as shown in FIG. As shown in FIG.
B is fitted in a fitting groove 31 which is recessed in the inner surface along the circumferential direction.

FIGS. 7 and 8 show a third embodiment of the present invention. FIG. 7 shows a fitting groove 33 formed in the inner surface of a receiving pipe 32b along a circumferential direction as a sealing material. An O-ring 34a having a substantially oval cross section is fitted, and the spigot pipe 32a is inserted into the O-ring 34a. FIG. 8 shows an O-ring 34b having a substantially oval cross section as a sealing material fitted into a plurality of fitting grooves 36 formed in the outer surface of the spigot pipe 35a along the circumferential direction. It is inserted into the inner surface of the ring 37. That is, the present embodiment is common in that all the sealing materials are O-rings. Then, on the sliding contact surfaces of the O-rings 34a and 34b, a lubricating heat sealing layer 38 similar to that of the first and second embodiments is formed to reduce the insertion resistance.

FIGS. 9 and 10 show a modified example of the spigot pipe 35a.
The O-rings 34c, 34d having the sliding heat-fused layer 38 formed on the sliding surfaces are fitted in the fitting grooves 39, 40. The materials of the pipe joints in the various forms of the first to third embodiments are all made of iron, plastic, concrete, and porcelain, and are mainly applied to sewer pipes, but can also be applied to water pipes. FIG. 11 shows a modification of the O-ring type sealing material. The sealing material 42 has a bifurcated portion 42a having a cross-sectional shape formed on the side to be fitted in the fitting groove, and has a semicircular small lip on its outer periphery. 42b, and the small lip 4
On the sliding contact surface 2b, a lubricating heat sealing layer 38 similar to the above is formed.

[0015]

As described above, according to the pipe joint of the present invention, the spigot pipe is inserted into the receiving pipe and sealed and fixed via an annular sealing material. A lubricating heat-sealable layer is formed on a sliding contact surface of an inner peripheral portion in contact with the sealing member; Therefore, even in a construction site under bad environmental conditions where dust is easily generated, dust and sand are likely to adhere to the lubricant Lb having adhesiveness as in the related art, which significantly impairs the sealing property and the water stopping property. There are no disadvantages, and the slip resistance at the end of the pipe can be significantly reduced by the lubricating heat-sealing layer, and the lubricating heat-sealing layer is formed at a desired position with a relatively uniform thickness. There is a feature that can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a pipe joint and a pipe connected to the pipe joint according to a first embodiment of the present invention;

FIG. 2 is a sectional view showing another embodiment of the embodiment.

FIG. 3 is a sectional view showing another embodiment of the above.

FIG. 4 is a cross-sectional view showing a pipe joint and a pipe connected to the pipe joint according to a second embodiment of the present invention;

FIG. 5 is a sectional view showing another aspect of the embodiment.

FIG. 6 is a sectional view showing another embodiment of the above.

FIG. 7 is a sectional view showing a pipe joint and a pipe connected thereto according to a third embodiment of the present invention.

FIG. 8 is a sectional view showing another aspect of the embodiment.

FIG. 9 is a sectional view showing another embodiment of the same pipe alone.

FIG. 10 is a sectional view showing another embodiment of the same pipe alone.

FIG. 11 is a cross-sectional view showing another mode of the same O-ring only.

FIG. 12 is a cross-sectional view of a conventional pipe joint and a pipe connected to the pipe joint, partially cut away.

FIG. 13 is a sectional view showing another embodiment of the above.

[Explanation of symbols]

11, 12, 13 Pipe joints 17, 27, 3
8 Lubricant heat sealing layer 11a, 12a, 13a Spout pipe 18, 28, 3
1 Fitting grooves 11b, 12b, 13b Receiving pipe 14, 15, 16 Sealing material

Claims (4)

[Claims] In a pipe joint in which a spigot pipe is inserted into a receiving pipe and is sealed and fixed via an annular sealing material, when the sealing material is fitted to the receiving pipe at an outer peripheral portion thereof, When a slippery heat-sealing layer is formed on at least a sliding contact surface of an inner peripheral portion of the sealing material that abuts on the spigot pipe, or the sealing material is fitted to the spigot pipe at an inner peripheral portion thereof. A lubricating heat-sealing layer is formed on at least a sliding contact surface of an outer peripheral portion of the sealing material in contact with the receiving pipe, and the lubricating heat-sealing layer is formed of a powdery or sheet-like polyolefin resin. A pipe joint characterized by being thermally fused to a sliding surface of a sealing material. 2. The sealing material is made of synthetic rubber or thermoplastic elastomer, and is formed by integrally forming a cylindrical portion on the side fitted to the pipe and a funnel-shaped sealing lip on the inner peripheral side thereof. Or an O-ring whose fitting side to the pipe is formed in a substantially brim-like shape, or an O-ring whose cross-sectional shape at the fitting side to the pipe is formed into a bifurcated portion and a small lip is formed on the outer periphery thereof. 2. The pipe joint according to claim 1, wherein the pipe joint is formed by projecting. 3. A fitting groove extending in the circumferential direction is formed in a portion of the spigot pipe or the receiving pipe where the sealing material is fitted, or a cylindrical fitting surface and a locking projection are formed. The pipe joint according to claim 1, wherein a step-shaped enlarged portion is formed. 4. The lubricating heat-sealing layer has a thickness of 10 μm to 100 μm.
The pipe joint according to claim 1, wherein the pipe joint is formed to have a thickness of: