JP3154881U - Pipe fitting - Google Patents

Abstract

In a pipe joint, it is possible to satisfy a fire resistance performance that has been increasingly demanded in recent years, and to withstand use in a ship. A joint body 2 in which insertion ports for pipe material 10 are provided at two locations on both ends, and a retainer 3 that is formed in a ring shape and arranged in a concentric manner and concentrically with each insertion port of the joint body 2; , A fastener 4 that presses the retainer 3 against the joint body 2, and a gasket 5 that is formed in a ring shape or a cylindrical shape and is sandwiched between the retainer 3 and the joint body 2. An annular pocket 15 for accommodating the gasket 5 is formed in the opening peripheral portion of the insertion port, and the retainer 3 has a pressing ring 25 that presses the gasket 5 in the annular pocket 15 and fits the protruding end into the annular pocket 15. In addition to being provided, a flameproof peripheral wall 26 is provided that is fitted around the end of the joint body 2 where the insertion port is provided in a substantially sliding contact state. [Selection] Figure 1

Description

  The present invention relates to a pipe joint particularly excellent in fire resistance.

As a pipe joint used for connecting pipe materials, one that allows stretchability and flexibility of the pipe material within a predetermined range is known (see, for example, Patent Document 1).
In this type of pipe joint, a ring-shaped packing and a retainer that holds the packing are provided at the tube insertion port with respect to the joint body that allows the pipe material to be fitted, and the retainer is arranged so as to surround the pipe material. The structure was provided with a plurality of bolts for pressing against the joint body.

  That is, when the retainer is pressed against the joint body by tightening the bolt, the packing is compressed in the axial direction between the retainer and the joint body, and the packing expands inward and outward in the radial direction by this action. Thus, the gap between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe material is sealed (sealed) by the packing.

JP 7-167361 A

In recent years, for pipe joints used in ships and the like, conditions required as performance (fire resistance performance) that can withstand high temperatures tend to be severe. For example, ISO 19921 and 19922 have been defined as requiring the performance to maintain a non-leakage state for 30 minutes or more in a high temperature environment of 800 ° C.
However, it has been the actual situation that conventional pipe joints having such fire resistance have not been developed yet. For this reason, in many pipe joints, the retainer pressing force decreases due to the thermal expansion of the bolt, that is, the axial compression force of the packing decreases, and the ability to seal the circumference between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe material There was a risk of lowering (sealability).

In addition, a flame may enter from the gap between the retainer and the joint body, and the packing itself may be directly exposed to the flame and cause thermal deterioration.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a fire-resistant pipe joint that satisfies the fire resistance performance that has been increasingly demanded in recent years and can withstand use in ships. .

In order to achieve the above object, the present invention has taken the following measures.
That is, the pipe joint according to the present invention is a ring-shaped joint provided with an insertion port through which pipe material is inserted in at least two places, and the insertion port is connected to each other, and a through hole through which the pipe material passes. A retainer that is arranged in a concentric manner and concentrically to each insertion port of the joint body, a fastener that presses the retainer to the joint body at a plurality of locations around the pipe material, and an outer peripheral surface of the pipe material. It is formed in a ring shape or a cylindrical shape provided with a close seal port, and has a gasket that is sandwiched and concentrically disposed between the retainer and the joint body.

The joint body is formed with an annular pocket for accommodating a gasket in the opening peripheral portion of the insertion port.
In addition, the retainer is provided with a pressing ring that axially presses a gasket that protrudes around the opening and is accommodated in the annular pocket of the joint body, and that fits the protruding end into the annular pocket. Further, the retainer is provided with a flameproof peripheral wall that is fitted around the end of the joint main body in a substantially slidable contact state.

  In addition, here, the end provided with the insertion port for the joint body and the flameproof peripheral wall are in a “substantially slidable contact state”. State (that is, meaning that it is not high-friction contact), state that is close enough not to touch (of course, relative movement is possible), and state that is not in contact but very close Including.

With such a configuration, the gasket is completely housed in the annular pocket of the joint body, and is pressed (compressed in the axial direction) by the retainer pressing ring in this state. In addition, in the joint body, the end portion where the insertion port is provided is surrounded by a flameproof peripheral wall provided in the retainer.
For these reasons, the gasket is not directly exposed to the flame from the outside of the joint body. Moreover, it is in the state shielded as much as possible from the high temperature environment. Therefore, it is possible to satisfy the fire resistance performance that has been increasingly demanded in recent years, and it can withstand use on ships.

The fastener includes a stud bolt planted in parallel with the axial direction of the pipe material at a position around the insertion port of the joint body and on the inner peripheral side from the flameproof peripheral wall of the retainer, and the stud bolt On the other hand, it is good to form with the nut screwed together by the part which penetrated the said retainer.
If it does in this way, exposure will also be suppressed as much as possible as a fastener, and the extension accompanying thermal expansion will be prevented as much as possible. Therefore, the pressing state of the retainer against the joint body is not lowered, and the reduction of the axial compression force of the gasket is prevented. Thereby, it is also prevented as much as possible that the ability (sealing performance) of the gasket to seal the circumference between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe material is reduced.

The annular pocket of the joint body is preferably formed as a straight hole concentric with the pipe material in a region where the protruding end of the pressing ring in the retainer is inserted at least while pressing the gasket.
In this case, even if the pressing state of the retainer against the joint body changes due to insufficient tightening of the fastener or imbalance of tightening, the inner peripheral surface of the annular pocket in the joint body and the outer periphery of the pressing ring in the retainer It is possible to prevent a gap such as a distortion from occurring between the surface and the periphery. For this reason, the ability of the gasket to seal the circumference between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe member (sealability) is also prevented from being lowered.

  According to the pipe joint which concerns on this invention, fireproof performance can be improved compared with the conventional pipe joint.

It is the sectional side view which showed 1st Embodiment of the pipe joint which concerns on this invention. It is the figure which showed the retainer from the AA arrow direction of FIG. It is the sectional side view which showed 2nd Embodiment of the pipe joint which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of a pipe joint 1 according to the present invention. The pipe joint 1 includes a joint body 2, a retainer 3 arranged in a superposed manner on the joint body 2, a fastener 4 for pressing the retainer 3 against the joint body 2, and the interior of the joint body 2. And a gasket 5 to be loaded.

The joint body 2 is formed in a short cylindrical shape having an inner diameter that can be fitted to the pipe material 10 to be connected, and the tube ports formed at both ends thereof are differences for inserting the pipe material 10 respectively. Used as a slot.
In the joint main body 2 of the first embodiment, a pair of end ring bodies 13 arranged at both ends, and a middle tube body 14 that connects between the end ring bodies 13 on both sides, respectively, have an inner peripheral surface and What is connected by fillet welding from both sides of the outer peripheral surface is shown. The middle tube body 14 is a straight tube. An insertion port is formed for each of the end ring bodies 13 on both sides, and the insertion ports on both sides are communicated with each other via the inside of the middle tube body 14.

  An annular pocket 15 is formed in the joint body 2 in such a state that the opening peripheral portion (inner peripheral surface) of the insertion port is enlarged, and the gasket 5 is accommodated in the annular pocket 15. It has become. The gasket 5 is formed in a ring shape or a cylindrical shape provided with a seal port 20 that surrounds the outer peripheral surface of the tube material 10 and comes into contact with the seal, and the gasket 5 is accommodated in the annular pocket 15. However, it goes without saying that the insertion port of the joint body 2 is maintained as it is as the seal port 20 of the gasket 5.

The annular pocket 15 is formed to have a straight hole 16 concentric with the pipe material 10 and a tapered hole 17 whose diameter is reduced toward the back as the joint body 2, and the straight hole 16 side is inserted. It is arranged near the opening end of the mouth.
The retainer 3 is formed in a ring shape provided with a through hole 21 through which the pipe material 10 is passed, and is arranged in a polymerized manner and concentrically with each insertion port of the joint body 2. Since the joint body 2 is provided with two insertion ports, a pair (two) of the retainers 3 are also provided.

The retainer 3 is provided with a pressing ring 25 that projects from the surface facing the joint body 2 so as to surround the passage 21. The pressing ring 25 is adapted to fit the protruding end into the straight hole 16 of the annular pocket 15 while pressing the gasket 5 housed in the annular pocket 15 of the joint body 2 in the axial direction.
The pressing ring 25 is formed with a constant outer diameter, and keeps non-contact with the straight hole 16 of the annular pocket 15 in sliding contact with or extremely close to the inner peripheral surface (a small clearance). It is supposed to be.

An annular tip surface of the pressing ring 25 is inclined at a gentle angle in a direction that is recessed in a funnel shape from the outer peripheral edge to the inner peripheral edge. Therefore, when the gasket 5 is pressed in the axial direction by the pressing ring 25, the gasket 5 is prevented from expanding radially outward or causing deformation such as turning over.
In addition, the retainer 3 is provided with a flameproof peripheral wall 26 that fits around the end portion where the insertion port is provided (the outer peripheral portion of the end ring 13). The flameproof peripheral wall 26 is a wall that protrudes while maintaining a constant inner diameter while forming an annular shape (endless in the circumferential direction) concentric with the passage 21, and an inner peripheral surface thereof is an end of the joint body 2. It is in the state which contacts the part outer peripheral surface lightly within the range which can be slid.

In addition, the inner peripheral surface of the flameproof peripheral wall 26 may be close to the extent that it does not contact the end outer peripheral surface of the joint body 2 or may be in a very close state without contact.
The fasteners 4 are provided at a plurality of locations in the circumferential direction evenly around the pipe material 10. In FIG. 2, there are 8 places (45 ° intervals), but the specific number of arrangements is not particularly limited as long as the condition of 3 places or more is satisfied. In the first embodiment, it is parallel to the axial direction of the pipe material 10 at a position around the insertion port (outer peripheral side) of the joint body 2 and on the inner peripheral side of the flameproof peripheral wall 26 of the retainer 3. The stud bolt 30 planted in this manner, and a nut 31 screwed into a portion of the stud bolt 30 penetrating the retainer 3 are formed.

  Therefore, the joint body 2 is formed with a bolt hole 33 for screwing the stud bolt 30 around the insertion port (near the outer periphery of the end face of the end ring 13). A bolt through hole 34 for penetrating the stud bolt 30 is formed. The bolt hole 33 may be a hole without a female screw, and the stud bolt 30 may be press-fitted or fixed by welding.

The stud bolt 30 has a length that allows the nut 31 to be screwed into a portion of the retainer 3 (the gasket 5 accommodated in the annular pocket 15 is pressed) that has penetrated the bolt through hole 34. It is necessary to.
In addition, the stud bolt 30 is preferably not too long (so that the bolt end does not protrude excessively from the nut 31 when the nut 31 is tightened). Thereby, the possibility that the stud bolt 30 is exposed to a flame or a high temperature environment is suppressed as much as possible, and thermal expansion does not occur. However, if the stud bolt 30 is made of a material that hardly causes thermal expansion (for example, chromium-based metal, stainless steel, titanium, etc.), these are not particularly important conditions.

  As described above, the gasket 5 is formed in a ring shape or a cylindrical shape in which the seal port 20 for passing the pipe material 10 is provided, and is sandwiched between the retainer 3 and the joint body 2 and is concentrically disposed. Is done. Since the annular pocket 15 formed in the joint body 2 has the straight hole 16 and the taper hole 17, the straight pipe portion 35 corresponding to the straight hole 16 and the taper hole 17 are also used as the gasket 5. It is preferable to have a tapered taper pipe portion 36 corresponding to the above.

The gasket 5 is also preferably formed of nitrile rubber (NBR) or the like with additives adjusted so as to be a material excellent in flame retardancy and heat resistance.
In the pipe joint 1 of the present invention having such a configuration, the gasket 5 is completely stored in the annular pocket 15 of the joint body 2 and is pressed (shafted) by the pressing ring 25 of the retainer 3 in this state. Compressed in the direction). Moreover, in the joint body 2, the end portion where the insertion port is provided is surrounded by a flameproof peripheral wall 26 provided in the retainer 3.

Therefore, the gasket 5 is not directly exposed to the flame from the outside of the joint body 2. Moreover, it is in the state shielded as much as possible from the high temperature environment.
Further, if the stud bolt 30 is used for the fastener 4, the exposure can be suppressed as much as possible, so that extension due to thermal expansion can be prevented as much as possible, and the pressing state of the retainer 3 against the joint body 2 can be reduced. It can be prevented. Therefore, the axial compression force of the gasket 5 is prevented from being reduced, and the ability of the gasket 5 to seal the circumference between the inner peripheral surface of the joint body 2 and the outer peripheral surface of the pipe member 10 (sealability) is also reduced. It can be prevented as much as possible.

As a result, the ability to maintain a non-leakage state in a high temperature environment of 800 ° C. for 30 minutes or more is obtained, and the fire resistance performance (for example, ISO 199921 and 199922, etc.) that is increasingly demanded in recent years is satisfied. Can do. Therefore, it can withstand use on ships.
[Others]
The present invention is not limited to the above-described embodiment, and can be appropriately changed according to the embodiment.

  For example, FIG. 3 is a second embodiment of the pipe joint 1 according to the present invention, and in this second embodiment, the joint body 2 is formed by being bent at the center in the longitudinal direction. . The bent portion is formed by the middle tube body 14. Therefore, in order to produce a joint body 2 having different bending angles or different lengths (distance between the end ring bodies 13), various types of intermediate tube bodies 14 are prepared for production. It will be a good thing.

Note that the bent state may be a curved curve such as a so-called elbow type in addition to a linear curve that exhibits a “<” shape.
Moreover, although illustration is abbreviate | omitted, as long as the coupling main body 2 has the insertion port of the pipe material 10 in at least two places, depending on the case, it increases the number of insertion ports and is comprised as a three-way coupling or a four-way coupling. You may let them.

  The joint body 2 can also be formed by integrating the end ring body 13 and the middle tube body 14.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 3 Retainer 4 Fastener 5 Gasket 10 Pipe material 15 Annular pocket 20 Sealing port 21 Through-hole 25 Press ring 26 Flameproof peripheral wall 30 Stud bolt 31 Nut

Claims (3)

A joint body (2) in which insertion ports for inserting the pipe material (10) are provided in at least two places, and the insertion ports are interconnected;
A retainer (3) which is formed in a ring shape provided with a through hole (21) through which the pipe member (10) is passed and is arranged in a concentric manner and concentrically to each insertion port of the joint body (2);
A fastener (4) for pressing the retainer (3) against the joint body (2) at a plurality of locations around the pipe (10);
It is formed in a ring shape or a cylindrical shape provided with a sealing port (20) that surrounds the outer peripheral surface of the pipe material (10) and is sandwiched between the retainer (3) and the joint body (2) and is concentric. A gasket (5) disposed on the
The joint body (2) is formed with an annular pocket (15) for accommodating the gasket (5) in the opening periphery of the insertion port,
The retainer (3) projects in the annular pocket (15) while axially pressing the gasket (5) that protrudes around the opening (21) and is accommodated in the annular pocket (15) of the joint body (2). There is provided a pressure ring (25) for fitting the protruding end to the side, and a flameproof peripheral wall (26) that fits around the end of the joint body (2) where the insertion port is provided in a substantially sliding contact state. A pipe joint characterized by being provided. The fastener (4) is arranged in the axial direction of the pipe (10) at a position around the insertion port of the joint body (2) and on the inner peripheral side of the flameproof peripheral wall (26) of the retainer (3). It is formed by a stud bolt (30) planted in parallel and a nut (31) screwed into a portion of the stud bolt (30) penetrating the retainer (3). The pipe joint according to claim 1. The annular pocket (15) of the joint body (2) is concentric with the pipe material (10) in a region where the protruding end of the pressing ring (25) in the retainer (3) is fitted at least while pressing the gasket (5). The pipe joint according to claim 1 or 2, wherein the pipe joint is formed as a straight hole.

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