JP2002147668A - In-core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-core capable of easily and surely finding a joint insufficiently inserted into a joint body of a pipe in the pressure inspection in the execution of work. SOLUTION: Seal rings 27a, 27b as sealing members are fitted in the joint body 18, and a clearance between an outer peripheral face of the pipe 11 and an inner peripheral face of the joint body 18 is sealed by the seal rings 27a, 27b in inserting the pipe 11 into the joint body 18. The in-core 13 is composed of a metallic cylindrical part 14 and an annular flange part 15 formed at its one end and outwardly extended to be perpendicular to the cylindrical part 14. An approximately square through-hole 16 in plane, is formed on one end of the cylindrical part 14, and the water flows out from the through hole 16 when the pipe 11 is insufficiently inserted into the joint body 18, whereby a defective can be easily and surely found.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for water pipes, hot water pipes, floor heating, road heating, and the like, and more particularly to an incore inserted into an end of the pipe.

[0002]

2. Description of the Related Art Generally, when a pipe made of a soft material such as a synthetic resin is inserted into a joint body,
An incore composed of a cylindrical portion and a flange at one end is inserted into the insertion end of the pipe. A seal ring as a seal member is fitted in the joint body, and when a pipe is inserted into the joint body, the seal ring seals a gap between the outer peripheral surface of the pipe and the inner peripheral surface of the joint body. ing. Conventionally, this type of incore prevents a pipe from deforming due to heat, pressure, or the like, from falling off from a joint, or preventing a liquid as a transport fluid from leaking from the joint.

[0003]

However, in this conventional incore, even in a joint where the end face of the pipe does not reach the seal ring, the flange portion of the incore inserted into the pipe has an inner peripheral surface of the joint body. Because it is engaged with
In the pressure inspection at the time of construction, it was not possible to find a joint having an insufficient depth of insertion of such a pipe into the joint body. When such a poorly inserted joint is used, there is a problem that the liquid is leaked from the joint due to the pressure of the liquid as the transport fluid being applied to the joint for a long time.

The present invention has been made by focusing on the problems existing in the prior art as described above. It is an object of the present invention to provide an incore that can easily and surely find a joint having an insufficient depth of insertion of a pipe into a joint body in a pressure test during construction.

[0005]

According to a first aspect of the present invention, there is provided an in-core having a tubular portion and a flange provided at one end thereof, wherein the in-core is inserted into an end of a pipe. The inserted pipe is inserted into the cylindrical joint body, and in this state, the outer peripheral surface of the pipe and the inner peripheral surface of the joint body are sealed by a seal member fitted into the joint body. An in-core configured to seal a liquid flowing in the joint body, wherein the cylindrical portion has a through hole at a position near a flange.

[0006] In the in-core according to the second aspect, the first aspect is the first aspect.
In the invention described in (1), the through hole is provided at a plurality of locations.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, the pipe 11 is made of polyolefin (cross-linked polyethylene,
Formed of a synthetic resin such as polybutene, etc.
Used for water supply piping. Also, the end face 1 of the pipe 11
2 is cut so as to be substantially perpendicular to the axis of the pipe 11.

As shown in FIG. 1 and FIG.
Is constituted by a cylindrical portion 14 made of a metal such as an alloy (brass, bronze, etc.), and an annular flange portion 15 extending outward at one end thereof so as to be orthogonal to the cylindrical portion 14. ing.

At one end of the cylindrical portion 14, a through hole 16 having a substantially square planar shape is provided. The outer peripheral surface of the flange portion 15 is formed with a first tapered surface 17 whose diameter decreases toward the outer end surface 31, and the pipe 11 in which the in-core 13 is inserted.
Can be easily inserted with reduced resistance to the inner peripheral surface of the joint body 18.

A second tapered surface 19 is formed on the outer peripheral surface of the other end of the cylindrical portion 14 so as to decrease in diameter toward the end.
The in-core 13 can be easily inserted into the pipe 11.

As shown in FIG. 1 and FIG.
Is composed of a substantially cylindrical main body 20 made of a metal such as an alloy (brass, bronze, etc.) and a substantially cylindrical push wheel 21 made of a metal such as an alloy (brass, bronze, etc.). A male screw portion 22 is formed on the outer peripheral surface of the base end portion of the main body 20,
It can be screwed into a pipe such as a water pipe. The push ring 21 has an insertion hole 23 for inserting the pipe 11.

As shown in FIG. 3, a contact surface 24 is provided in the main body 20 in an annular shape so as to be orthogonal to the axis of the main body 20. When the pipe 11 is inserted into the joint main body 18, the Is stopped at a predetermined position.

A first groove 25 and a second groove 26 are formed in the inner peripheral surface of the main body 20 in a circumferential direction from the inner part. A first seal ring 27a and a second seal ring 27b each having a circular cross section as a seal member are fitted in the first groove 25 and the second groove 26, respectively. When the pipe 11 is inserted into the joint body 18,
The outer peripheral surface of the pipe 11 is pressed to seal a gap between the outer peripheral surface of the pipe 11 and the inner peripheral surface of the main body 20.

As shown in FIGS. 1 and 3, a pair of lock rings 29 with a spacer 28 interposed therebetween are disposed in the main body 20. Then, the lock ring 29 is engaged with the outer peripheral surface of the pipe 11 inserted into the joint main body 18, so that the pipe 11 is retained and held in the joint main body 18.

Next, the in-core 1 configured as described above
The operation of No. 3 will be described. Now, after the pair of lock rings 29 with the spacer 28 interposed therebetween is inserted into the main body 20, the pressing ring 21 is tightened to the main body 20.

When the in-core 13 is inserted into the pipe 11, the other end of the cylindrical portion 14 is inserted into the end opening of the pipe 11 until the end face 12 of the pipe 11 comes into contact with the inner end face 30 of the flange 15. . Next, the end of the pipe 11 on which the in-core 13 is inserted is inserted into the joint body 18 from the insertion hole 23.

At this time, as shown in FIG. 4, when the outer end surface 31 of the flange portion 15 does not reach the contact surface 24 and is located between the second seal ring 27b and the lock ring 29, In the pressure test at the time of construction, the liquid as the transport fluid flows out from the through-hole 16 of the in-core 13 through the space between the inner end face 30 of the flange 15 and the end face 12 of the pipe 11 by the pressure, and the joint body 18 Leak from the tip of the

Therefore, by confirming whether or not there is such a leak, it is possible to confirm whether or not the pipe 11 is sufficiently inserted into the joint main body 18. According to the embodiment described in detail above, the following effects are exhibited.

In the in-core 13 of the present embodiment, a through hole 16 is provided at one end of the cylindrical portion 14. For this reason, in the pressure inspection at the time of construction, in a joint where the insertion depth of the pipe 11 into the joint main body 18 is insufficient, liquid leaks from the joint. Therefore, the pipe 11
A joint having an insufficient insertion depth into the joint main body 18 can be easily and reliably found.

In the in-core 13 of the present embodiment, the through hole 16 is in contact with the flange 15. Therefore, the liquid flows from the through hole 16 of the in-core 13 to the inner end surface 3 of the flange 15.
It can easily flow out between 0 and the end face 12 of the pipe 11.

In the in-core 13 of the present embodiment, the first tapered surface 17 of the flange portion 15 is formed so as to decrease in diameter toward the outer end surface 31. Therefore, the insertion resistance when inserting the pipe 11 in which the in-core 13 is inserted into the joint main body 18 can be reduced, and the pipe 11 can be reliably inserted. The second tapered surface 19 at the other end of the cylindrical portion 14 is formed so as to decrease in diameter toward the end. Therefore, the incore 13 is connected to the pipe 11
Can be easily interpolated.

The above-described embodiment can be modified as follows. The shape of the through-hole 16 may be changed to a substantially circular, elliptical or triangular shape in a plane. Also in the case of such a configuration, it is possible to easily and surely find a joint in which the insertion depth of the pipe 11 into the joint main body 18 is insufficient.

The through hole 16 may be provided in the cylindrical portion 14 at a position away from the flange portion 15. Also in the case of such a configuration, it is possible to easily and surely find a joint in which the insertion depth of the pipe 11 into the joint main body 18 is insufficient.

A plurality of the through holes 16 may be provided at one end of the cylindrical portion 14. Alternatively, the shape may be changed to a linear shape.
In the case of such a configuration, the joint body 18 of the pipe 11
It is possible to more easily and reliably find a joint whose insertion depth is insufficient.

When the end face 12 of the pipe 11 is cut obliquely with respect to the axis of the pipe 11,
The flange 1 is formed only on the protruding portion of the oblique end face 1.
5 comes into contact with the inner end surface 30. For this reason, in a portion other than the protruding portion, a gap is generated between the inner end surface 30 of the flange portion 15 and the end surface of the pipe 11. When the end of the pipe 11 is inserted into the joint body 18, the outer end surface 31 of the flange 15 does not reach the contact surface 24, and at least a portion other than the protruding portion of the end surface of the pipe 11 is in the second position. Seal ring 27
b, the second seal ring 27b
Does not press the outer peripheral surface of the pipe 11. For this reason, since the gap between the outer peripheral surface of the pipe 11 and the inner peripheral surface of the main body 20 is not sealed, the liquid leaks from the joint. In a joint using a conventional in-core, even in a joint having such an insufficient insertion depth, the flange 15 is engaged with the inner peripheral surface of the joint main body 18, so that it is found by a pressure test during construction. I couldn't do that. However, the in-core 1 of the present embodiment
3, in the pressure inspection during construction, the liquid flows out from the through hole 16 of the in-core 13 through the space between the inner end face 30 of the flange 15 and the end face of the pipe 11 due to the pressure, and the tip end of the joint body 18. Leak from Therefore, by confirming whether or not there is this leakage, it can be confirmed whether or not the entire outer peripheral surface of the pipe 11 has reached the second seal ring 27b.

As shown in FIG. 5, when the outer end surface 31 of the flange portion 15 does not reach the contact surface 24 and is located between the first seal ring 27a and the second seal ring 27b, In the pressure test during construction, the liquid as a transport fluid flows out from the through hole 16 of the in-core 13 through the space between the inner end face 30 of the flange 15 and the end face 12 of the pipe 11 due to the pressure. Further, when the pressure of the liquid is high, the sealing is insufficient with only one second seal ring 27b, the pressure of the liquid resists the pressing force of the second seal ring 27b against the outer peripheral surface of the pipe 11, and the liquid is pressed against the second seal ring. 27
It flows out between b and the outer peripheral surface of the pipe 11 and leaks out from the distal end portion of the joint body 18. Therefore, by checking whether or not there is this leakage, it is possible to check whether or not the seal is sufficient.

Next, the technical ideas that can be grasped from the embodiment will be described below. (1) The incore according to claim 1 or 2, wherein the through hole is in contact with the flange. According to this configuration, it is possible to easily and reliably find a joint having an insufficient depth of insertion of the pipe into the joint body.

(2) The in-core according to claim 1 or 2, wherein the through holes are provided at two opposing positions in the cylindrical portion. According to this configuration, it is possible to more easily and reliably find a joint with an insufficient depth of insertion of the pipe into the joint body.

(3) A joint body having a tubular shape, into which a pipe can be inserted, and a seal member fitted into the joint body are provided, and the pipe is prevented from being deformed inside the pipe. For this purpose, a joint having an incore inserted into an end portion thereof, the incore having a cylindrical portion and a flange portion provided at one end thereof, wherein the cylindrical portion is provided with a through hole at a position near the flange portion. According to this configuration, it is possible to provide a joint capable of easily and surely finding a joint in which the pipe is insufficiently inserted into the joint main body in a pressure test during construction.

(4) The above-mentioned (3) further comprising a regulating means which is disposed in the joint body and engages with the outer peripheral surface of the pipe inserted into the joint body to prevent the pipe from coming out of the joint body. The joint described in the above. According to this configuration, the pipe can be held in the joint body only by inserting the pipe into the joint body.

[0031]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, it is possible to easily and surely find a joint having an insufficient depth of insertion of the pipe into the joint main body in the pressure test during construction.

According to the invention described in claim 2, according to claim 1
In addition to the invention described in the above, in the pressure inspection at the time of construction, it is possible to more easily and surely find a joint with an insufficient depth of insertion of the pipe into the joint body.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a joint according to an embodiment.

FIG. 2 is a sectional view showing an incore.

FIG. 3 is a partially broken side view showing a state before a pipe is inserted into a joint main body.

FIG. 4 is a semi-longitudinal sectional view showing a joint in which an outer end surface of a flange portion of the in-core is located between a second seal ring and a lock ring.

FIG. 5 is a semi-longitudinal sectional view showing a joint in which an outer end surface of a flange portion of the incore is located between a first seal ring and a second seal ring.

[Explanation of symbols]

Reference numeral 11 denotes a pipe, 13 denotes an incore, 14 denotes a cylindrical portion, 15 denotes a flange portion, 16 denotes a through hole, 18 denotes a joint body, 27a denotes a first seal ring as a seal member, and 27b denotes a second seal ring as a seal member.

Claims (2)

[Claims] 1. A tubular body, comprising a flange provided at one end thereof, inserted into an end of the pipe, and the inserted pipe is inserted into a tubular joint body, and An in-core configured to seal a liquid flowing through the joint body between an outer peripheral surface of the pipe and an inner peripheral surface of the joint body by a seal member fitted in the joint body in a state, An in-core, wherein a through-hole is provided in a position near the flange in the cylindrical portion. 2. The in-core according to claim 1, wherein the through holes are provided at a plurality of locations.