JP2019190655A - Pipe joint - Google Patents

Abstract

To provide a pipe joint having heat resistance and solvent resistance, and forming a transparent pipe insertion completion confirmation region.SOLUTION: A pipe joint is composed of an inner and outer double structure of an inner layer (11) of a transparent resin made of a heat resistant resin and an outer layer (13) of a transparent resin made of a solvent resistant resin, has a mark ring body (20) that is pushed by a tip surface (12) of a pipe (P) to be inserted and inserted into a hole (15) of a joint body (1), and is configured to be able to visually confirm from the outside (E) of the joint body that the mark ring (20) has reached an insertion completion confirmation region (G) of the joint body (1).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipe joint.

Conventionally, the present inventor has proposed a number of novel pipe joints. For example, a patent application has been filed for a pipe joint as shown in FIG. 5 (see Patent Document 1).
That is, as shown in FIG. 5, a metal joint body 62 having an insertion cylinder portion 70 inserted into the end portion of the pipe 61 to be connected and the pipe 61 externally fitted to the insertion cylinder portion 70. A C-shaped tightening ring 63 with slits for tightening the end portion with a resilient tightening force, and the diameter of the tightening ring 63 is increased against the resilient force of the tightening ring 63 The diameter-enlarging piece 64 that is removably inserted into the slit and clamped and abuts on the tip of the pipe 61 that is inserted, and the clamping ring that clamps the diameter-expanding piece 64 And a transparent cylindrical cover member 65 that surrounds the body 63 and is rotatably fitted to the joint body 62.

Japanese Patent No. 3843288

  The conventional pipe joint shown in FIG. 5 is manufactured and sold in large numbers in Japan, and is an excellent pipe joint that has no problem at all depending on the application, use environment, and conditions. It has turned out that there is.

For the cylindrical cover member 65, polysulfone (PSP) excellent in transparency, strength, heat resistance, and chemical resistance is used. Therefore, it is a pipe joint suitable not only for water supply but also for hot water supply. However, “paint” sprays on the cylindrical cover member 65 under conditions of use where the “adhesive” used at another location for pipe connection drops or the indoor coating is performed after the indoor piping work is completed. In some cases, it may adhere.
If the solvent (solvent) contained in the “adhesive” and “paint” adheres to the cylindrical cover member 65, a solvent crack will occur, which may cause a serious water leakage accident in the interior of the new building. It has been found.
Solvent cracks are similarly generated in all other resins such as PSU and PPSU that have heat resistance that can withstand hot water supply and have transparency, and a water leakage accident occurs in the room of a new building.

Further, since the pipe joint shown in FIG. 5 includes the insertion tube portion 70 having a large thickness and having a seal groove for fitting the seals 66, 66 closely contacting the inner peripheral surface 61A of the pipe 61 to be inserted. , decreased inner diameter D ₇₀ of the flow path is significantly greater fluid flow resistance, there is a problem that the pressure loss of the piping is increased.
Further, as the pipe 61 is inserted, the small diameter-expanding piece 64 is detached from the fastening ring body 63 and accommodated in the annular space 74, and the diameter-expanding piece after the separation is passed through the transparent cylindrical cover member 65. The operator or inspector visually confirms 64, but it is difficult to visually confirm in which position of the small-diameter expanded piece 64 exists in the annular space 74 extending 360 °. There was a point.
If the operator (inspector) rotates the cylindrical cover member 65 with his / her finger, the enlarged diameter piece 64 must be brought to the circumferential position where it is easy to see and visually checked, which is a cumbersome and difficult task. It was.

  Therefore, the present invention provides a joint body comprising a pipe insertion completion confirmation region comprising an inner and outer double structure of a transparent resin inner layer and a transparent resin outer layer, and the transparent resin inner layer is made of a heat resistant resin, and the transparent resin outer layer Is made of solvent-resistant resin, and has a mark ring that is pushed by the tip surface of the pipe to be inserted and inserted into the hole of the joint body, and the mark ring is completely inserted into the joint body It has been configured so that it can be visually confirmed from the outside of the joint body that the confirmation region has been reached.

According to the present invention, the inner layer of the pipe insertion completion confirmation region is made of a transparent resin material that can withstand the heat of hot water supply, and the outer layer of the pipe insertion completion confirmation region is resistant to adhesives and paints (solvent resistance By using a transparent resin material (provided), it was possible to form a pipe insertion completion confirmation region having the three characteristics of hot water resistance, solvent resistance, and transparency, which was conventionally considered impossible.
Moreover, the operator can inspect the mark ring body (and the most advanced part of the pipe such as milky white) from any 360 ° outside the joint body, and can prevent poor pipe connection.

It is a longitudinal cross-sectional view which shows the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows 2nd Embodiment. It is a longitudinal cross-sectional view which shows 3rd Embodiment. It is a figure which shows a retaining ring, Comprising: (A) is a cross-sectional side view, (B) is a front view. It is a longitudinal cross-sectional view which shows a prior art example.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
If it demonstrates from 1st Embodiment shown in FIG. 1, the left half of FIG. 1 is a pipe unconnected state, and the right half is a longitudinal cross-sectional view which shows a pipe insertion (connection) completion state.
P ₀ is a pipe to be connected, and the material is preferably a relatively soft resin such as PEX or PB. (Note that a relatively soft resin such as PE or crosslinked PE may be used.)

The pipe joint according to the present invention includes a retaining ring 5 made of a thin metal plate having a large number of teeth 3 that can bite into the outer peripheral surface 2 of the connected pipe P ₀ at the inner peripheral edge 4 (FIG. 4). reference). The retaining ring 5 is made of a highly rigid metal plate having a resilient force such as SUS material, and as shown in FIG. A large number of teeth 3 are formed by being bent in an inclined manner in the insertion direction A of ₀ .
As shown in the right half of FIG. 1, the teeth 3 of the stop ring 5, a pipe drawing blocking state bites into the outer circumferential surface 2 of the pipe P _0, while rotating the pipe P ₀ and integrally shaped, axial outside The pipe is prevented from being pulled out in the direction Y.

In FIG. 1, the joint body 1 is illustrated as a socket type, and is symmetrical with respect to the central line Lm in the axial direction. Structure.
In addition, an opaque cylindrical body 7 having an inner flange 7A is externally fitted and fixed to the left and right of the joint body 1 in the axial direction. This cylindrical body 7 is externally fixed in a slaughter manner by fitting an opaque resin excellent in solvent resistance such as PC (polycarbonate). The low corrugated corrugated portion 8 has a pull-out preventing function after forcibly fitting the opaque cylindrical body 7 to the joint body 1.

As is apparent from FIG. 1, the joint body 1 has an inner / outer double structure comprising a transparent resin inner layer 11 and a transparent resin outer layer 13, but an opaque cylindrical body 7 is fixed to each end in the axial direction, Only the space region formed between the inner ends 7B and 7B of the opaque cylindrical bodies 7 and 7 is transparent, and this space region is defined as a pipe insertion completion confirmation region G.
The operator or inspector can visually confirm from the outside E of the joint body 1 that the distal end surface 12 of the pipe P ₀ has been pushed into the transparent pipe insertion completion confirmation region G. A closed annular mark ring body 20 is provided.

In FIG. 1, reference numeral 9 denotes a thin metal cylindrical body integrally having an outer flange portion 9 </ b> A at the tip, and the outer flange portion 9 </ b> A of the cylindrical body 9 is used as the mark ring body 20.
That is, the outer peripheral surface of the outer flange portion 9A has a tapered surface 10 with a reduced diameter toward the tip, and the tapered surface 10 is made red, orange, yellow (by painting or coating), As the fluorescent color, a marker ring 20 that can be visually confirmed by an operator or an inspector from any 360 ° outside the pipe insertion completion confirmation region G is used. In addition, the most advanced part of the milky white pipe P ₀ can be visually confirmed from any direction of 360 °.

As described above, in the first embodiment shown in FIG. 1, the mark ring body 20 is composed of the outer flange portion 9A at the tip of the thin-walled metal cylinder 9, and extends into the hole of the pipe P ₀ from the tip to a small dimension. In the state where the thin metal cylinder 9 is tightly inserted (refer to the right half of FIG. 1), one part of the thin metal cylinder 9 that exhibits a reinforcing function to prevent the pipe P ₀ from deforming abnormally in diameter reduction. It is composed.
Moreover, as it is clear from FIG. 1, the seal 17, such as the two O-ring, in close contact with (inserted) the outer circumferential surface 2 of the pipe P _0. That is, the outer surface water sealing structure is adopted. A backup ring 14 for the seal 18 is interposed between the inner collar 7A of the opaque cylindrical body 7 and the outer end surface of the joint body 1. Further, the corners of the inner periphery and the outer end surface of the backup ring 14 are chamfered along the inclination of the tooth portion 3 of the retaining ring 5 described above.

As can be seen from FIG. 1, the seals 17, 18 are arranged at axial center positions other than the transparent insertion completion confirmation region G in the joint body 1. is doing. That is, in FIG. 1, the seals 17 and 18 are arranged in correspondence with the axial center position of the opaque cylindrical body 7.
As described above, the joint body 1 has an inner / outer double structure composed of the transparent resin inner layer 11 and the transparent resin outer layer 13, and is transparent throughout the axial direction when the opaque cylindrical body 7 is not fixed.
The inner layer 11 is made of a heat resistant resin that can withstand hot water supply. For example, polysulfone (PSU), polyphenylene sulfide (PPSU), polysulfone (PSP) and the like are suitable. On the other hand, the outer layer 13 is made of a solvent-resistant resin that is resistant to solvents. For example, polycarbonate (PC) is suitable. In particular, it is an essential condition that both the inner layer 11 and the outer layer 13 are “transparent”.
Then, two types of resins are laminated and integrated with each other by two-color injection molding.

By the way, if opaqueness is acceptable, a resin satisfying both heat resistance and solvent resistance has been conventionally present, and opaque polyphenylene sulfide (PPS) such as a gray color is known as a material for pipe joints.
However, under the condition that it must be "transparent", it can withstand hot water supply--withstands around 95 ° C--and simultaneously satisfies the heat resistance and solvent resistance that withstands solvents in adhesives and paints. There is no practical resin.

Therefore, in the pipe joint according to the present invention, the inner layer 11 made of a transparent and heat-resistant resin and the outer layer 13 made of a transparent and solvent-resistant resin are laminated and integrated with each other by two-color injection molding. For the first time, the joint body 1 satisfying the following three conditions was born.
Condition (i): Heat resistance (about 95 ° C) that can withstand hot water supply.
Condition (ii): Solvent resistance that does not cause cracking due to the solvent contained in the adhesive or paint when the adhesive or paint adheres from the outside.
Condition (iii): Transparency that allows visual confirmation from the outside E that the mark ring body 20 has reached the insertion completion confirmation region G is provided.

Next, the shape and structure of each part shown in FIG. 1 will be specifically described.
The joint body 1, the axial center position, has an inner flange portion 31 of substantially equal internal diameter to the inner diameter of the pipe P _0, the outer flange portion 9A of the metallic cylindrical member 9 has at the pipe P ₀ pushed by the person a stepped portion 32 in contact, the slope portion 33, the pipe tip inserted in a diameter portion 34 slightly larger than the outer diameter of the pipe P _0, the stepped portion 35 of the inner side seal 17 abuts the seal 17 , 18 and a seal groove bottom surface forming large diameter portion 36 into which the spacer 16 is fitted. Since this is a socket-type pipe joint, the joint body 1 can be easily pulled out after forming the hole-forming stepped core mold in the opposite axial direction.
Further, a seal groove that accommodates the seal 17, the spacer 16, and the seal 18 is formed by the stepped portion 35, the large diameter portion 36, and the backup ring 14.

Next, a second embodiment shown in FIG. 2 will be described. The metal cylinder 9 shown in FIG. 1 is omitted, and instead, the joint body 1 itself is integrally provided with a thin insertion cylinder 19.
The insertion cylinder part 19 of FIG. 2 and the metal cylinder body 9 of FIG. 1 are thin and have a significantly reduced thickness compared to the insertion cylinder part 70 of FIG. 5 showing the conventional example. The inner diameters D ₁₉ and D ₉ shown in FIG. 2 and FIG. 1 are larger than the inner diameter D ₇₀ of FIG. 5 of the conventional example, so that the passage resistance of hot water or water can be reduced. The reason why the inner diameters D ₁₉ and D ₉ can be sufficiently large is that the seals 66 and 66 provided in the insertion tube portion 70 of FIG. 5 are omitted, and the outer peripheral surface of the pipe P ₀ as shown in FIGS. This is because the positions of the seals 17 and 18 are changed so as to be in close contact with each other.

As shown in FIG. 2, the mark ring body 20 is formed of a closed annular ring 22 made of resin (or rubber), and has an inclined surface 22A on the outer periphery (reducing the diameter to the tip).
When the pipe P ₀ is inserted in the direction of arrow A, the inclined surface 22A of the mark ring body 20 (ring 22) elastically expands the diameters of the seals 18 and 17 so that the end of the pipe P ₀ passes smoothly. Demonstrate the guide function to guide to. In this respect, in FIG. 1, the tapered surface 10 of the outer flange portion 9A also exhibits a similar guide function.

Further, FIG. 2 shows a case where the opaque cylindrical body 7 is fused to the joint body 1 in an outer fitting shape. That is, it is free whether it is fixed by fitting as shown in FIG. 1 or fixed by fusion as shown in FIG.
In the second embodiment shown in FIG. 2, the same reference numerals as those in FIG. 1 have the same configuration, and the description of the configurations other than those described above will be omitted below.

  1 and 2, the opaque cylindrical body 7 is externally fitted (fixed) at a position in the axial direction other than the pipe insertion completion confirmation region G in the joint body 1. Although not shown in the drawings, it is possible to form the opaque cylindrical wall portion (opaque resin portion) in a position other than the insertion completion confirmation region G by integrating the joint body 1 by multicolor injection molding.

Next, FIG. 3 shows a third embodiment of the present invention. Compared with the second embodiment of FIG. 2, as is clear, the opaque cylindrical body 7 is formed of a thin metal plate such as stainless steel, and the retaining ring 24 of the retaining ring 5 is added to the tip, A plastic deformation is densely applied to the position in the axial (axial center) direction excluding the pipe insertion completion confirmation region G, and is fixed in an outer fitting shape.
For the other configurations, the same reference numerals as those in FIG.

  The present invention is not limited to the illustrated embodiment, and the design can be freely changed. In addition to the socket, an adapter having a connecting portion having another shape such as a screw at the other end, an elbow, or a cheese may be used. Furthermore, it is not limited to the retaining ring 5 illustrated in FIG. 4 but can be freely changed to various known retaining mechanisms.

As described above, the joint body 1, the pipe insertion completion confirmation region G made of inner and outer double structure of a transparent resin inner layer 11 and the transparent resin layer 13, comprising, furthermore, by the tip face 12 of the pipe P ₀ to be inserted It has a mark ring body 20 that is pushed in and inserted into the hole 15 of the joint body 1, and the joint body exterior E indicates that the mark ring body 20 has reached the insertion completion confirmation region G of the joint body 1. Therefore, the pipe insertion completion confirmation region G can be combined with transparent resins that maintain transparency under various severe use conditions, environments, and atmospheres. By the combination, it is possible to quickly and reliably inspect (inspect) whether the pipe P ₀ is inserted to the normal position by visually confirming the mark ring body 20 from any one of 360 ° from the joint body exterior E. . For example, polycarbonate (PC) has excellent solvent resistance and can be used in environments and atmospheres where adhesives and paint solvents adhere. However, it is not suitable for use under conditions of high internal fluid temperature. However, PSU, PPSU, and PSP can be used for hot water supply, but solvent cracks occur in the environment and atmosphere where the solvent adheres. The problem that the transparent pipe insertion completion confirmation region G cannot be formed only with the resin can be solved. Therefore, it is possible to prevent a serious accident such as water leakage from the hot water supply pipe (with the wall surface coating) in the room of the new building.

Moreover, since the opaque resin part was arrange | positioned in the axial center direction position other than the said insertion completion confirmation area | region G in the said coupling main body 1 in the pipe joint which concerns on this invention, an operator or an inspector can perform the insertion completion confirmation area | region G. Concentrate attention only on the situation and perform quick and reliable confirmation and inspection.
Further, since the opaque cylindrical body 7 is externally fitted at a position in the axial direction other than the insertion completion confirmation region G in the joint main body 1, the opaque cylindrical body 7 is attached to the joint main body by fitting or heat sealing. The opaque cylinder 7 allows the operator or inspector to concentrate his attention only on the insertion completion confirmation region G and perform quick and reliable confirmation and inspection.

  The transparent resin inner layer 11 is made of a heat-resistant resin, and the transparent resin outer layer 13 is made of a solvent-resistant resin and is laminated and integrated with each other by two-color injection molding. There is no air layer between 13 and it is highly transparent, and it is possible to check the completion of pipe insertion easily, quickly and reliably. In particular, the inner layer 11 has excellent heat resistance and can be used for hot water supply, and the outer layer 13 has excellent durability without causing solvent cracks even if an adhesive or paint solvent adheres to it. Can effectively prevent accidents caused by water leakage in new buildings (wooden).

Further, the mark ring member 20 is composed of an outer flange portion 9A projecting from the front end of the thin metallic cylindrical member 9, in the configuration of the pipe P ₀ is provided with a reinforcing function to prevent that condensation径異normal deformation Therefore, when it is pushed by the tip of the pipe P ₀ and is smoothly inserted into the joint body 1 with a stable posture, and when a large local external force in the diameter reducing direction of the retaining ring 5 acts on the pipe P ₀ , securely support, the pipe P ₀ is an accident such that pullout with that locally reduced径異normal deformation can be prevented.
Further, since the mark ring body 20 is composed of a closed annular ring 22 having an inclined surface 22A on the outer periphery, the guide at the time of inserting the pipe is prevented so that the corner portion of the end face of the pipe P ₀ does not damage the seals 18 and 17. It also serves as a (guidance) function, and is simple and inexpensive as a component.

Further, since the seals 17 and 18 that are in close contact with the outer peripheral surface 2 of the pipe P ₀ are disposed at positions other than the insertion completion confirmation region G in the joint body 1, the mark ring body 20 is visually confirmed. In addition, the wall portion of the inner / outer double structure in the pipe insertion completion confirmation region G can be placed very close to the mark ring body 20, which makes visual inspection easier and more reliable. Can be done.

DESCRIPTION OF SYMBOLS 1 Joint body 2 Outer peripheral surface 7 Opaque cylindrical body 9 Metal cylindrical body 9A Outer casing
11 Transparent resin inner layer
12 Tip surface
13 Transparent resin outer layer
15 hole
17, 18 seal
20 landmark ring
22 Closed ring
22A Inclined surface G Pipe insertion completion confirmation area P ₀ Connected pipe E External

Claims (1)

The joint body (1) has a pipe insertion completion confirmation region (G) composed of an inner / outer double structure of a transparent resin inner layer (11) and a transparent resin outer layer (13), and the transparent resin inner layer (11) is heat resistant. The transparent resin outer layer (13) is made of a solvent-resistant resin.
Furthermore, it has a mark ring body (20) inserted into the hole (15) of the joint body (1) by being pushed by the tip surface (12) of the pipe (P ₀ ) to be inserted,
A pipe joint characterized in that it can be visually confirmed from the outside (E) of the joint body that the mark ring (20) has reached the insertion completion confirmation region (G) of the joint body (1). .

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