JP2003287176A - Tube coupling - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tube coupling having the function capable of absorbing a twist, a bend, and the extension-contraction of a pipe. <P>SOLUTION: A coupling body 1 is divided into first and second two cylindrical bodies 2 and 3 mutually slidably fitted in the shaft direction and the peripheral direction, and connecting members 6 and 7 are fixed to end parts of the respective cylindrical bodies 2 and 3 by interposing a directly connecting ring 4 and a sealant 5 for sealing a fitting place in the fitting place of these cylindrical bodies 2 and 3. The directly connecting ring 4 is arranged by straddling annular grooves 21 and 31 respectively formed on the inner peripheral side of the first cylindrical body 2 and the outer peripheral side of the second cylindrical body 3. A groove width of the annular groove 31 of the second cylindrical body 3 is wider than a groove width of the annular groove 21 of the first cylindrical body 2. A flexible pipe 8 can be connected to the connecting members. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint, and more particularly to a pipe joint having a function of absorbing a twist of a pipe line connecting the pipe joint or a twist or expansion of a flexible pipe line connecting the pipe joint. Regarding

[0002]

2. Description of the Related Art For example, in a water pipe for handling relatively high-pressure water such as a water pipe of a fire extinguishing facility, a flexible pipe joint is interposed in the middle of the pipe, and the bending of the pipe is absorbed by the action of the flexible pipe joint. I was trying to let it.
This flexible pipe joint is a bellows-type flexible short pipe having a connecting member such as a flange connected to both ends thereof, and the flexibility of the flexible short pipe absorbs bending of the conduit.

[0003]

However, although the above-mentioned conventional flexible pipe joint works effectively for the flexible short pipe to absorb the bending of the pipe line, it does not absorb the twisting or expansion and contraction of the pipe line. It was impossible to do so, and when the pipe was twisted or expanded or contracted due to an earthquake or the like, the pipe was easily damaged. In addition, the torsional stress may remain at the connecting point of the pipeline during the pipe construction.

The present invention has been made in view of the above circumstances, and it is possible to prevent the situation where the twisting stress remains in the pipeline after the pipe construction, and also in the event of an earthquake or An object of the present invention is to provide a pipe joint capable of absorbing the twist even when the pipe line is twisted due to a water hammer action such as when high-pressure water flows in at once. Also,
INDUSTRIAL APPLICABILITY The present invention is a pipe capable of absorbing twisting, stretching, and bending even when the pipeline is twisted, stretched, or bent, such as during an earthquake or when a water hammer action of high-pressure water occurs. The purpose is to provide a joint.

[0005]

The pipe joint according to the present invention comprises:
The tubular joint main body is divided into two first and second tubular bodies that are fitted so as to be slidable in the circumferential direction, and the circumferential sliding is allowed at the fitting portions of these tubular bodies. A direct coupling ring for preventing the two tubular bodies from being pulled out and a sealing material for sealing the fitting portion thereof are interposed, and a coupling member coupled to the counterpart member is fixed to the end portion of each tubular body. In the pipe joint of this configuration, when twist occurs in the mating members respectively connected to the connecting member of the first tubular body and the connecting member of the second tubular body,
The twist is absorbed by the relative sliding rotation of the first cylinder and the second cylinder.

In the present invention, annular grooves of equal width are formed in an overlapping manner on the inner peripheral side of the first cylindrical body and the outer peripheral side of the second cylindrical body at the above-mentioned fitting portions, and these annular grooves are formed in an overlapping manner. The direct coupling ring is arranged straddlingly, and the diameter of the direct coupling ring is elastically contractible, and the annular groove on the side of the second cylinder is formed to a depth capable of accommodating the entire diameter of the reduced direct coupling ring. Is desirable. According to this, when the first tubular body and the second tubular body are fitted together, the direct coupling ring is placed at the location where the annular groove of the second tubular body is formed, and from that state, the first tubular body is moved to the second tubular body. When the first cylinder shrinks the diameter of the direct coupling ring and rides on the direct coupling ring as it is fitted into the tubular body, when the annular groove of the first tubular body overlaps the annular groove of the second tubular body. The diameter of the direct coupling ring is increased and the direct coupling ring is disposed at a position straddling the annular groove of the first tubular body and the annular groove of the second tubular body. Therefore, only by fitting the first cylinder body and the second cylinder body, both cylinder bodies are connected so as not to come off.

In another pipe joint according to the present invention, a tubular joint body is divided into two first and second tubular bodies fitted to each other so as to be slidable in the axial direction and the circumferential direction. A sealing material for sealing the fitting portion is interposed at the fitting portion of the cylinder body, and a coupling member connected to the counterpart member is fixed to the end portion of each cylinder body, and the fitting is performed. An annular groove is formed on each of the inner peripheral side of the first cylindrical body and the outer peripheral side of the second cylindrical body at a location, and the groove width of the annular groove of the second cylindrical body is larger than the groove width of the annular groove of the first cylindrical body. A direct coupling ring is provided which is wide and straddles the annular grooves to prevent the two cylinders from being pulled out. In this case, the direct coupling ring can be elastically reduced in diameter, and a groove-shaped recess for accommodating the elastically reduced diameter direct coupling ring is provided at one axial end of the annular groove of the second tubular body. desirable.

In the pipe joint of this construction, when twist occurs in the mating members respectively connected to the connecting member of the first tubular body and the connecting member of the second tubular body, the twisting occurs in the first tubular body and the second tubular body.
It is absorbed by the relative sliding rotation with the cylindrical body.

Further, when at least one of the mating members connected to each of the connecting members of the first and second cylinders expands and contracts, the direct coupling ring is held in the annular groove of the first cylinder. As it moves together with the first cylinder and slides in the annular groove of the second cylinder in the axial direction, expansion and contraction of the counterpart member is caused by relative movement of the first cylinder and the second cylinder in the axial direction. Be absorbed.

Further, the direct coupling ring can be elastically contracted, and a groove-shaped recess for accommodating the elastically contracted direct coupling ring is provided at one axial end of the annular groove of the second tubular body. Then, when the first cylinder and the second cylinder are fitted together, the direct coupling ring is placed at the position where the groove-shaped recess of the second cylinder is formed, and from that state, the first cylinder is moved to the second cylinder. As the first cylinder rides on the direct coupling ring as it is fitted into the tubular body, the diameter of the direct coupling ring is reduced and stored in the groove-shaped recess, and then the first cylindrical body is fitted into the groove-shaped recess of the second tubular body. When the annular grooves of the first tubular body overlap, the diameter of the direct coupling ring is expanded and the direct coupling ring is arranged at a position straddling the annular groove of the first tubular body and the annular groove of the second tubular body. Therefore, only by fitting the first cylinder body and the second cylinder body, both cylinder bodies are connected so as not to come off.

In the present invention, it is desirable that the connecting member fixed to the end of the first cylinder or the second cylinder can connect the flexible pipe. According to this, since the twist and the expansion and contraction are absorbed by the pipe joint and the bending and the expansion and contraction are absorbed by the flexible pipe, the twist resistance, the bending resistance, and the expansion and contraction resistance are improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first pipe joint according to the present invention.
It is the side view which showed a part of embodiment by the cross section. In this pipe joint A, a cylindrical joint main body 1 is divided into first and second two tubular bodies 2 and 3 which are fitted so as to be slidable in the circumferential direction (slidingly rotatable). A direct coupling ring 4 that allows sliding in the circumferential direction to prevent the two cylinders 2 and 3 from slipping off and a sealing material 5 that seals the fitting parts are interposed at the fitting positions of the cylinders 2 and 3. Has been done. Also, each of the cylinders 2,
At the end of 3, connecting members 6 and 7 made of flanges that are connected to the counterpart member are fixed by welding.

The direct coupling ring 4 has a truncated circular shape in which one portion in the circumferential direction is cut off, and the diameter can be reduced and the diameter can be increased against the elasticity of itself. Then, as shown in a partially enlarged manner in FIG. 1, the direct coupling ring 4 has an inner peripheral side of the first cylindrical body 2 and an outer peripheral side of the second cylindrical body 3 at a fitting position of the two cylindrical bodies 2 and 3. It is arranged so as to straddle annular grooves 21 and 31 of equal width formed in an overlapping manner on the sides. Also, the second
The annular groove on the side of the cylindrical body 3 is formed to a depth capable of accommodating the entire diameter-reduced direct coupling ring.

In this pipe joint A, the first cylinder 2 and the second cylinder 3 are relatively slidably rotatable. Therefore, when twist occurs in the counterpart member (not shown) connected to the connecting member 6 of the first tubular body 2 and the connecting member 7 of the second tubular body 3, respectively,
The twist is absorbed by the relative sliding rotation of the first cylinder 2 and the second cylinder 3.

Further, since the diameter of the direct coupling ring 4 can be elastically reduced and the annular groove 31 on the side of the second tubular body 3 is formed to a depth capable of accommodating the entire diameter of the direct coupling ring 4 whose diameter has been reduced, When the first tubular body 2 and the second tubular body 3 are fitted together, the direct coupling ring 4 is placed at the location where the annular groove 31 of the second tubular body 3 is formed,
When the first tubular body 2 is fitted into the second tubular body 3 from that state, the first tubular body 2 reduces the diameter of the direct coupling ring 4 and rides on the direct coupling ring 4, and the second tubular body 3 First in the annular groove 31
When the annular grooves 21 of the tubular body 2 overlap, the diameter of the direct coupling ring 4 expands and is arranged at a position straddling the annular groove 21 of the first tubular body 2 and the annular groove 31 of the second tubular body 3. . Therefore, there is an advantage that the first cylinder 2 and the second cylinder 3 are simply fitted together, and the two cylinders 2 and 3 are connected so as not to come off.

FIG. 2 is a side view showing a part of a second embodiment of the pipe joint according to the present invention in cross section. In this pipe joint A, a cylindrical joint main body 1 is fitted with a circumferentially slidable (slidingly rotatable) two first and second tubular bodies 2, 3
Is divided into two parts, and at the fitting points of those cylinders 2 and 3,
A direct coupling ring 4 which allows sliding in the circumferential direction and prevents the two cylinders 2 and 3 from coming off, and a sealing material 5 for sealing the fitting position.
With respect to the point where and are interposed, and the point that the connecting members 6 and 7 that are flanges that are connected to the counterpart member are fixed by welding to the ends of the respective cylinders 2 and 3 in FIG. This is similar to the case of the first embodiment described. Also, FIG.
As shown in a partially enlarged view in FIG.
The inner peripheral side of the first tubular body 2 and the second tubular body
A point that the direct coupling ring 4 is disposed so as to straddle the annular grooves 21 and 31 that are formed so as to overlap with the outer peripheral side of the cylindrical body 3, and that the direct coupling ring 4 is cut away at one location in the circumferential direction. The same applies to the fact that the diameter is reduced and the diameter can be increased against the elasticity of itself.

In this pipe joint A, the first cylinder 2 and the second cylinder 3 are relatively slidably rotatable. Therefore, when twist occurs in the counterpart member (not shown) connected to the connecting member 6 of the first tubular body 2 and the connecting member 7 of the second tubular body 3, respectively,
The twist is absorbed by the relative sliding rotation of the first cylinder 2 and the second cylinder 3.

Further, when at least one of the mating members (not shown) connected to each of the connecting members 6 and 7 of the first and second cylindrical bodies 2 and 3 expands and contracts, the direct coupling ring 4 becomes While being held in the annular groove 21 of the first tubular body 2, it moves together with the first tubular body 2 and slides in the annular groove 31 of the second tubular body 3 in the axial direction. It is absorbed by the relative movement of the body 2 and the second cylindrical body 3 in the axial direction.

Further, the direct coupling ring 4 can be elastically reduced in diameter, and one end portion in the axial direction of the annular groove 31 of the second tubular body 3 is provided with a groove-shaped recess 32 for accommodating the elastically reduced diameter direct coupling ring. Therefore, when the first tubular body 2 and the second tubular body 3 are fitted together, the direct coupling ring 4 is placed at the location where the groove-shaped recess 32 of the second tubular body 3 is formed, and from that state When the first tubular body 2 is fitted into the second tubular body 3, the first tubular body 2 rides on the direct coupling ring 4 to reduce the diameter of the direct coupling ring 4 to be housed in the groove-shaped recess 32. After that, when the annular groove 21 of the first tubular body 2 overlaps the groove-shaped recess 32 of the second tubular body 3, the diameter of the direct coupling ring 4 is expanded and the annular groove 21 and the second tubular body 2 of the first tubular body 2 are expanded. Body 3
It is arranged at a position straddling the annular groove 31 of. for that reason,
By simply fitting the first cylinder 2 and the second cylinder 3 together, the two cylinders 2 and 3 are connected so as not to come off.

In each of the embodiments shown in FIGS. 1 and 2, each of the connecting members 6 and 7 of the first cylinder 2 and the second cylinder 3 is a flange, but these connecting members 6 and 7 are illustrated. 7 may be a connecting element other than the flange. The first in FIG.
A third embodiment is shown in which a nipple is adopted as the connecting member 6 of the tubular body 2 and a flange is adopted as the connecting member 7 of the second tubular body 3. Although the embodiment of FIG. 3 is an example in which the connecting member 6 made of the flange of the embodiment of FIG. 2 is replaced with a nipple, this point replaces the connecting member 6 of the flange of the embodiment of FIG. 1 with a nipple. It is also possible.

FIG. 4 shows an example in which the pipe joint A described in FIG. 2 is connected to both ends of the flexible pipe 8. The flexible pipe 8 is provided with flanges 81 and 82 at both ends thereof, one flange 81 is connected to the connecting member 7 which is a flange of the pipe joint A on one side, and the other flange 82 is a flange of the pipe joint A on the other side. Is connected to the connecting member 6. Further, the other connecting members 6 and 7 of the pipe joint A on one side and the pipe joint A on the other side are connected to a fixed object (for example, fixed pipe).

According to this example, the pipe joints A, A on both sides are
Twisting and expansion and contraction are absorbed by the flexible tube 8, and bending and expansion and contraction are absorbed by the flexible tube 8. Therefore, a pipe line having excellent twist resistance, bending resistance, and expansion and contraction resistance is formed.

FIG. 5 is a side view showing a part of the flexible tube 8 with its main part cut away. As shown in the same figure, in this flexible tube 8, the end of the metal flexible tube 83 having an uneven tube wall is joined to the end of the sleeve 84 by welding.
A straight tube portion 85 slidably and rotatably attached to the sleeve 84
Is slidably and rotatably fitted, and the sleeve 84
And the flange portion 86 of the straight pipe portion 85 between the flange 87.
Is held. In addition, a seal material 88 for sealing the fitting portion and a direct coupling ring 89 for preventing the sleeve 84 and the straight pipe portion 85 from coming off are interposed at the fitting portion of the sleeve 84 and the straight pipe portion 85. . further,
The flexible tube 83 is covered with a protective jacket 80. Therefore, the sleeve 84 and the straight tube portion 85 relatively slide and rotate, so that the flexible tube 8 itself exhibits an action of absorbing the twist. Therefore, in the pipe line shown in FIG. 4, in addition to the twists and expansions and contractions being absorbed by the respective pipe joints A, A connected to both ends of the flexible pipe 8, the flexible pipes 8 also absorb the bends, expansions and contractions. Therefore, it is extremely excellent in twist resistance, bending resistance, and stretch resistance.

[0024]

As described above, since the pipe joint according to claim 1 or 2 exhibits the action of absorbing the twist, the twisting stress remains in the pipeline after the pipe construction. Even when the pipe line is twisted in the event of an earthquake or when the water hammer action of high-pressure water occurs, it has a beneficial effect of absorbing the twist.

In addition, the pipe joint according to claim 3 or claim 4, when an earthquake or a water hammer action of high-pressure water occurs,
Even when the pipe is twisted or expanded, it exerts a beneficial effect of absorbing the twist or expansion.

Further, the pipe joint according to the fifth aspect not only absorbs the twist and expansion when the pipe is twisted or expanded, but also absorbs the bending and expansion of the pipe due to the action of the flexible pipe. It also comes to exert the function to do.

[Brief description of drawings]

FIG. 1 is a side view showing a cross section of a part of a first embodiment of a pipe joint according to the present invention.

FIG. 2 is a side view showing a cross section of a part of a second embodiment of a pipe joint according to the present invention.

FIG. 3 is a side view showing a cross section of a part of a third embodiment of a pipe joint according to the present invention.

FIG. 4 is a schematic side view illustrating a usage state of the pipe joint A described in FIG.

FIG. 5 is a side view showing a partial cutaway of a main part of a flexible tube 8.

[Explanation of symbols]

A fitting 1 Joint body 2 First cylinder 3 Second cylinder 4 direct connection ring 5 Seal material 6,7 Connection member 8 flexible tubes 21,31 annular groove 32 groove-shaped recess

Claims (5)

[Claims] 1. A tubular joint body is divided into two first and second tubular bodies fitted so as to be slidable in the circumferential direction, and the circumferential sliding is provided at the fitting points of these tubular bodies. A direct coupling ring that allows movement and prevents the two tubular bodies from being pulled out and a sealing material that seals the fitting portion are interposed, and a coupling member that is coupled to the counterpart member is provided at the end of each tubular body. A pipe joint characterized by being fixed. 2. The inner peripheral side of the first tubular body and the second tubular body at the fitting portion.
An annular groove of equal width is formed on the outer peripheral side of the tubular body so as to overlap each other, and the direct coupling ring is arranged across the annular grooves, and the direct coupling ring is elastically contractible. The pipe joint according to claim 1, wherein the annular groove on the side of the second tubular body is formed to a depth capable of accommodating the entire diameter-reduced direct coupling ring. 3. A tubular joint main body is divided into two first and second tubular bodies fitted to each other so as to be slidable in the axial direction and the circumferential direction, and at the fitting positions of these tubular bodies. A sealing material for sealing the fitting portion is interposed, a connecting member that is connected to the counterpart member is fixed to the end portion of each tubular body, and the inside of the first tubular body is fixed at the fitting portion. An annular groove is formed on each of the peripheral side and the outer peripheral side of the second cylindrical body, and the groove width of the annular groove of the second cylindrical body is wider than the groove width of the annular groove of the first cylindrical body. A pipe joint that is provided with a direct coupling ring that straddles the annular groove of 1 to prevent the two tubular bodies from coming off. 4. The direct coupling ring is capable of elastic diameter reduction,
The pipe joint according to claim 3, wherein a groove-shaped recess for accommodating the directly connected ring having a reduced diameter is provided at one end portion of the annular groove of the second cylindrical body in the axial direction. 5. The flexible pipe can be connected by a connecting member fixed to an end of the first cylinder or the second cylinder.
To the pipe joint according to claim 4.