JP2000283360A - Joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint hardly damaged even if external force such as torque is applied thereto. SOLUTION: This joint 1 connects the corresponding ends of adjacent long- sized members 5, 6 rotatably to each other. The joint 1 is provided with a first member 2 having a first connection part 2g to which the end of one long- sized member 5 is connected, and a partially spherical receiving recessed part 2c; and a second member 3 having a second connection part 3f to which the end of the other long-sized member 6 is connected, and a partially spherical fitting part 3b rotatably fitted into the receiving recessed part 2c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint for rotatably connecting corresponding ends of a long member such as a pipe.

[0002]

2. Description of the Related Art Conventionally, connection of pipes and the like buried underground is
Normally, male threads are formed in advance on the outer circumference at both ends of the pipe, and adjacent pipes are connected to each other using a tubular pipe joint having a pair of female threads on the inner circumference on both sides.

[0003]

However, in that case,
For example, if a torsional force is applied to the pipe joints through the pipes on both sides due to an earthquake, land subsidence, etc., the pipe joints and the ends of the pipes connected to them are easily damaged, and water leaks from the damaged part. There was a problem that accidents such as gas and gas leaks occurred.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a joint which is hardly damaged even when an external force such as a torsion force is applied. Therefore, the joint according to claim 1 of the present invention is a joint for rotatably connecting corresponding ends of adjacent long members, and a first connection to which the end of one long member is connected. Member, a first member having a partially spherical receiving recess, a second connecting portion to which an end of the other long member is connected, and a partially spherical member rotatably fitted in the receiving recess. And a second member having a fitting portion.

[0005] According to the above configuration, when a torsional force is applied to the joint portion via the long members on both sides due to an earthquake, land subsidence, or the like, the receiving recess of the first member and the fitting portion of the second member can be used. Between the joints and the torsional force, the joint portion and the end of the long member connected to the joint are less likely to be damaged by the torsional force.

[0006] A joint according to a second aspect is the joint according to the first aspect, wherein the long member is a tube.

According to a third aspect of the present invention, in the configuration of the second aspect, a ring groove is formed on a surface of the fitting portion, and O prevents passage of fluid between the receiving groove and the ring groove in the ring groove.
A ring is inserted.

According to a fourth aspect of the present invention, there is provided the joint according to any one of the first to third aspects, wherein the first and second connecting portions are screws.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the pipe joint 1 (joint) of the present embodiment includes, for example, a first member 2 and a second member 3 each made of metal or the like. The first member 2 and the second member 3 are fitted by fitting the partially spherical fitting portion 3b provided on the second member 3 into the partially spherical receiving recess 2c provided on the first member 2. They are rotatably connected to each other within a predetermined angle range A (see FIG. 4) around the reference position in FIG.

As shown in FIG. 2, the first member 2 has a cylindrical large-diameter portion 2a having an axis L1 indicated by an alternate long and short dash line as a central axis.
And a cylindrical small diameter portion 2b also having the axis L1 as a central axis.
Are integrally formed. And the large diameter portion 2a
A receiving concave portion 2 having a partial spherical shape with a radius D1 with a center O1 at a position slightly closer to the small diameter portion 2b than the intermediate portion in the axial direction.
c is formed. A tapered (frustoconical) hole 2d is formed from the receiving recess 2c toward the side opposite to the small-diameter portion 2b, with the axis L1 being the center and gradually increasing in diameter toward the side opposite to the small-diameter portion 2b. ing. In addition, the large diameter portion 2
a at the end of the receiving recess 2c on the small diameter portion 2b side in
A circular vertical surface 2e orthogonal to the axis L1 is formed.

The small diameter portion 2b is formed with a tapered hole 2f whose diameter gradually decreases toward the large diameter portion 2a.
Is provided with a tapered female screw 2g (first connection portion) on the inner peripheral surface of the. The hole 2f and the receiving recess 2c are formed in a hole 2 having a circular cross section whose diameter is reduced stepwise around the axis L1.
h. By the holes 2f and 2h, the receiving recess 2c, and the hole 2d, the entire first member 2 is moved along the axis L.
A hole (recess) penetrating in one direction is formed.

On the other hand, as shown in FIG.
Is a cylindrical portion 3a having a cylindrical shape with an axis L2 indicated by a dashed line as a central axis, a fitting portion 3b having a partial spherical shape with a radius D2 around a point O2 located on the axis L2, and an axis L.
2, a connecting portion 3c for connecting the cylindrical portion 3a and the fitting portion 3b to each other. The radius D2 of the spherical portion of the fitting portion 3b is set to be equal to or slightly smaller than the radius D1 of the spherical portion of the receiving recess 2c. Note that a circular distal surface 3d orthogonal to the axis L2 is formed at the distal end position of the fitting portion 3b.

In the cylindrical portion 3a, the axis L2 is centered,
Tapered hole 3e whose diameter gradually decreases toward the connecting portion 3c
Is formed on the inner peripheral surface of the hole 3e.
(Second connection part) is formed. Also, a circular hole 3g centered on the axis L2 is provided in the connecting portion 3c and the fitting portion 3b.
Are formed. The holes 3e and 3g are aligned with the axis L2.
Are centered on each other and are communicated with each other by holes 3h having a circular cross section whose diameter gradually decreases. The above holes 3e, 3h and 3g
Thereby, a hole (recess) penetrating the entire second member 3 in the direction of the axis L2 is formed. Note that an annular ring groove 3i is formed on the surface of the fitting portion 3b along a circumference centered on the point O2, and the O-ring 4 is formed in the ring groove 3i.
Are fitted.

When the fitting portion 3b of the second member 3 is fitted into the receiving recess 2c of the first member 2 at the time of assembling the pipe joint 1, for example, the first member 2 must include the axis L1 in advance. The first member 2 is joined and integrated by welding or the like in a state where it is divided into two by a flat surface, and the fitting part 3b is fitted in each receiving recess 2c of the two pieces. can do. In this manner, in a state where the fitting portion 3b is fitted in the receiving recess 2c, the center O1 of the spherical portion of the receiving recess 2c matches the center O2 of the spherical portion of the fitting portion 3b (see FIG. 1). (Point O), the first member 2 and the second member 3 are rotatable within a predetermined angle range (within the range of the angle A in FIG. 4). It should be noted that the fitting portion 3b is fitted in the recess 2c, and the axes L1 and L2 of the first and second members 2 and 3 are substantially aligned with each other. Tip surface 3d of second member 3
A predetermined gap B is formed between them.

Using the pipe joint 1, for example,
When connecting the pair of pipes 5 and 6 (long members), as shown in FIG. 1, for example, a tapered male screw 5 a provided at one end of one pipe 5 is connected to a tapered female screw 2 g of the first member 2. While being connected by screwing, the tapered male screw 6a provided on the other pipe 6 is screwed into the tapered female screw 3f of the second member 3 and connected. By using the tapered female screws 2g and 3f and the tapered male screws 5a and 6a, a strong connection state can be obtained.

In the above connection state, the feed path 5b in the pipe 5
Are the hole 2h in the first member 2, the receiving recess 2c, the second member 3
It communicates with the feed path 6b in the pipe 6 through the holes 3g and 3h. In addition, since the O-ring 4 is disposed between the outer peripheral surface of the fitting portion 3b and the receiving recess 2c, sufficient liquid-tightness or air-tightness is ensured, and the fluid supplied through the pipes 5, 6 ( Liquid such as water, gas, etc.)
The problem of leaking from the gap between c and c is unlikely to occur.

Although not specifically shown, the pipes 5 and 6 and the pipe joint 1 are usually buried in the ground, in which case the adjacent pipes 5 and 6 are usually arranged on substantially the same straight line L. It is buried in the posture that was done. And in this embodiment,
After burial, a pair of pipes 5, due to factors such as earthquake and land subsidence,
6, in other words, the first and second members 2, 3 of the pipe joint 1.
Even when a torsional force is generated between the first and second members 2 and 3 as shown in FIG. 4, relative rotation occurs according to the torsional force. The ends of the connected pipes 5 and 6 are hardly damaged. Therefore, pipes 5, 6
Leakage of a fluid such as water or gas fed through the inside is less likely to occur.

The receiving recess 2c of the first member 2 and the second
Since the fitting portion 3b of the member 3 is formed in a partially spherical shape, the rotation between the first and second members 2 and 3 can occur in the vertical direction, the horizontal direction, and any oblique direction. . The maximum allowable rotation angle A generated when the outer periphery of the connecting portion 3c of the second member 3 is rotated to a position where it contacts the tapered hole 2d of the first member 2 is, for example, a value of several degrees to about 20 degrees. (Approximately 10 ° in the case of the drawing), but is not limited to this range. As is apparent from FIG. 4, when the relative rotation occurs up to the maximum allowable rotation angle A, the distal end face 3d of the second member 3 becomes the vertical surface 2e of the first member 2.
And the distal end surface 3d and the vertical surface 2e do not interfere with each other within the allowable rotation angle.

FIG. 5 shows a second embodiment of the present invention. This embodiment is a combination of the rotary type pipe joint 1 and the telescopic type pipe joint 7 described above. The pipe joint 1 shown in FIG. 5 is different from that of the above-described embodiment in that the first and second connection portions are not tapered female threads, but are ordinary female threads 2.
i, 3j and the cylindrical part 3 of the second member 3
The difference is only that a large-diameter portion 3k is formed at the end of “a”. The other portions are denoted by the same reference numerals, and redundant description will be omitted.

On the other hand, the telescopic pipe joint 7 includes a cylindrical inner cylinder member 8 and a cylindrical outer cylinder member 9 into which a part of the inner cylinder member 8 is slidably fitted. I have. A male screw 8a is formed on the outer periphery of one end of the inner cylinder member 8. The male screw 8a is detachably screwed to the female screw 3j of the second member 3 of the pipe joint 1, whereby the pipe joints 1 and 7 are connected to each other.

The outer diameter D3 of the inner cylinder member 8 is made smaller than the inner diameter D4 of the outer cylinder member 9, whereby a radial gap is formed between the outer periphery of the inner cylinder member 8 and the inner periphery of the outer cylinder member 9. Is formed. The other end of the inner cylindrical member 8 has an inner diameter D4 of the outer cylindrical member 9.
A large diameter portion 8b having an outer diameter substantially equal to that of the outer cylindrical member 9 is formed, while a small diameter portion 9a having an inner diameter approximately equal to the outer diameter D3 of the inner cylindrical member 8 is formed at one end of the outer cylindrical member 9.
The large-diameter portion 8b and the small-diameter portion 9a serve to prevent the inner cylinder member 8 from coming off from the outer cylinder member 9.

The large-diameter portion 8b of the inner cylindrical member 8 is provided with, for example, a pair of front and rear ring grooves 8c. Liquid-tightness or air-tightness is secured between the outer periphery of the tubular member 8 and the inner periphery of the outer tubular member 9. Further, a female screw 9 b is formed on the inner periphery of the other end of the outer cylinder member 9.

Using the pipe joints 1 and 7, the
When connecting a pair of pipes, as shown in FIG. 5, in a state where the pipe joints 1 and 7 are connected to each other, an end of one pipe (not shown) is screwed into the female screw 2i of the pipe joint 1 and connected, and the other pipe is connected. May be screwed into the female screw 9b of the pipe joint 7 for connection.

In this way, when a torsional force is generated between a pair of adjacent pipes, it is possible to cope with the rotation between the first and second members 2 and 3 in the pipe joint 1, and the pipe can be disposed in the longitudinal direction. When a tensile or compressive force is generated, the pipe joint 7
Can be handled by sliding (relative movement in the axial direction) between the inner cylinder member 8 and the outer cylinder member 9. Therefore, even if a longitudinal pulling force or a compressive force is generated due to an earthquake or the like,
Piping and pipe joints 1 and 7 are less likely to be damaged.

It should be noted that in the above description, the first
Although the pair of pipes 5 and 6 are arranged and connected in substantially the same straight line, for example, when it is necessary to connect the adjacent pipes 5 and 6 in an inclined manner, the first and second pipes 1 and 2 in the pipe joint 1 are required. By appropriately adjusting the angle between the members 2 and 3, such an inclined connection can be easily performed. Further, in the above-described embodiment, the pipe joint for connecting the pipes has been described. However, the present invention is applicable not only to the pipe joint but also to a joint for connecting a solid rod-shaped member having no feed passage therein. It is applicable, and it is possible to connect these rod-shaped members rotatably (or freely expandable and contractible). The long members such as pipes and rod-shaped members are not buried in the ground, but may be provided on the ground or in a building.

[0026]

A joint for rotatably connecting corresponding ends of adjacent elongated members according to claim 1 of the present invention,
A first connecting portion to which an end of one long member is connected, a first member having a partially spherical receiving concave portion, and a second connecting portion to which an end of the other long member is connected, A second fitting portion having a partially spherical fitting portion rotatably fitted in the receiving recess.
When a torsional force is applied to the joint portion due to an earthquake or the like, the receiving recess of the first member and the second
Since the rotation corresponding to the torsion force occurs between the member and the fitting portion, damage to the joint portion due to the torsion force is less likely to occur.

Since both the receiving concave portion and the fitting portion are formed in a spherical shape, the receiving concave portion and the fitting portion can be moved in any direction between the first member and the second member, such as a vertical direction, a horizontal direction, or an arbitrary oblique direction. Rotation can occur, and damage to joints and ends of long members can be effectively suppressed even when a torsional force due to an earthquake or the like is applied in any direction.

In the joint according to the second aspect of the present invention, in the structure of the first aspect, since the long member is a tube, damage to the joint is less likely to occur as described above, and as a result, the joint is fed through the tube. Leakage accidents of liquids such as water and various fluids such as gas are less likely to occur.

According to a third aspect of the present invention, in the structure of the second aspect, a ring groove is formed on the surface of the fitting portion, and the passage of fluid between the receiving recess and the ring groove is prevented in the ring groove. Since the O-ring is inserted, leakage of fluid from the gap between the receiving recess and the fitting portion in a steady state in which no impact such as an earthquake is applied is less likely to occur.

According to a fourth aspect of the present invention, in the structure of any one of the first to third aspects, since the first and second connecting portions are screws (female or male), the end portion of the long member to be connected. By forming a corresponding screw (male screw or female screw) on the outer periphery of the joint in advance, it is possible to easily connect the long member to the joint by screw joining.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a state where pipes are connected to each other using a pipe joint according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a first member of the pipe joint.

FIG. 3 is a longitudinal sectional view showing a second member of the pipe joint.

FIG. 4 is a schematic side view showing a state where rotation has occurred between first and second members of the pipe joint;

FIG. 5 is a schematic side view showing a pipe joint according to a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 pipe joint (joint) 2 first member 2c receiving recess 2g tapered female screw (screw: first connection part) 3 second member 3b fitting part 3f taper female screw (screw: second connection part) 3i ring groove 4 O-ring

Claims (4)

[Claims] 1. A joint for rotatably connecting corresponding ends of adjacent elongated members, wherein the first connecting portion is connected to an end of one of the elongated members, and has a partially spherical shape. A first member having a receiving recess, a second connecting portion to which an end of the other long member is connected, and a partially spherical fitting portion rotatably fitted to the receiving recess. A joint comprising a second member. 2. The joint according to claim 1, wherein said elongated member is a tube. 3. A ring groove is formed on a surface of the fitting portion, and an O-ring is inserted into the ring groove to prevent passage of a fluid between the receiving groove and the receiving groove. 2. The joint according to 2. 4. The joint according to claim 1, wherein said first and second connection portions are screws.