JPH02163592A - Pipe joint - Google Patents

Abstract

PURPOSE:To confirm the position of the edge part of a connection pipe in the perfectly connected state by forming a connection pipe insertion confirming hole for confirming the position of the edge part of the connection pipe on the flange part of a tightening member. CONSTITUTION:A pair of connection pipe insertion confirming holes 31c which penetrate in the radial direction through a flange part 31 are formed on the flange part 31 of a tightening member 30. Since the hole 31c is formed at the symmetrical positions, setting the center axis of the flange part 31 interposed, if a connection pipe 60 is inserted into the flange part 31, the edge part of the pipe 60 can be recognized from outside through the hole 31c. Therefore, the connection pipe 60 is inserted into the gap between the tightening part 33 of the tightening member 30 and the guide part 11 of a joint body 10, until the top edge contacts the edge surfaces 12b of the tool engagement part 12 of the body 10, and at this time, the insertion of the edge part of the pipe 60 into the flange 31 is confirmed through the hole 31c, and then a cap nut 50 is revolved, and screw-fed, and the part between the inner peripheral surface of the pipe 60 and the outer peripheral surface of the guide part 11 is sealed in liquidtight form by a sealing member 20. In this case, the position of the edge part of the pipe 60 is confirmed through the hole 31c.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pipe joint used when joining pipe materials such as hot water pipes and water supply pipes.

(Prior art) Pipe joints used when piping hot water supply pipes and water supply pipes using synthetic resin pipes or composite pipes in which the inner circumferential surface or both the inner and outer circumferential surfaces of metal pipes are coated with synthetic resin are not practical. 1986. -22
It is disclosed in Japanese Patent No. 991.

The pipe fitting is on the - side as shown in FIG.

It has a joint body 70 provided with a cylindrical connecting part 73 that is connected to equipment such as a valve or other pipe joints. A cylindrical guide part 72 that fits into the end of the connecting pipe 60 is provided on the other side of the joint body 70, and a hexagonal outer surface is provided between the guide part 72 and the connecting part 73. A nut portion 74 is provided. The nut portion 74 has a cylindrical tightening member 80.
A connecting portion 81 with a hexagonal inner surface provided at the base end is fitted onto the outside and fixed.

The outer surface of the connecting portion 81 has a hexagonal shape so that a tightening tool such as a spanner can be engaged therewith. The tightening member 80 has a tightening portion 82 connected to the connecting portion 81 and externally fitted onto the guide portion 72 of the joint body 70 at a predetermined interval. The outer diameter of the connecting portion 82 is smaller than the outer diameter of the three connecting portions 81, and a groove is provided on the outer circumferential surface of the proximal end thereof. Extending slits are formed at appropriate intervals in the circumferential direction, so that the diameter of the tip can be reduced.The tightening is accomplished by screwing a cap nut 90 into the threaded groove of the portion 82. , by tightening the bag nand 90, the tightening i=j
The diameter of the distal end of the bent portion 82 is reduced.

In this pipe joint, the connecting part 73 of the joint body 70 is attached to a predetermined part such as a valve, and the one bag nut 90 is loosened.
The end of the connecting pipe 60 is inserted between the T & J portion 82.

Each time the four-bag nand 90 is rotated and tightened, the diameter of the tip that goes into the tightening member 80 is reduced, and the connecting pipe 60 is attached to the outer peripheral surface of the guide part 72 that goes into the joint body. The seal member 100 in the groove 72a is pressed. As a result, the connecting pipe 60 and the guide portion 7 of the joint body 70
2 and the clamping part 82 of the clamping member 80 to prevent it from coming out, and the sealing member 100 provides a fluid-tight seal between the guide part 72 of the joint body 70 and the connecting pipe 60. Ru.

(Problems to be Solved by the Invention) In the conventional pipe joint having such a configuration, the connecting pipe 60 is sufficiently connected between the guide portion 72 of the joint body 70 and the fastening portion 82 of the tightening member 80. It is necessary to tighten the cap nut 90 in the inserted state. For this reason, a connection tube insertion confirmation hole 82a is provided at the proximal end of the tightening portion 82 of the normal line opening member 80, passing through the wall surface of the tightening portion 82. When the connecting tube 60 is inserted, the insertion state of the connecting tube 60 is confirmed through the connecting tube insertion confirmation hole 82a provided in the portion 82 for tightening. However, since the connecting tube insertion confirmation hole 82a is provided at the proximal end of the tightening portion 82, when the cap nut 90 is screwed into the portion 82 to some extent, the connection tube insertion confirmation hole 82a is tightened by the cap nut 90. 82a is covered and the cap nut 90 is completely tightened, the end position of the connecting pipe 60 is
11 will not be recognized. The connecting pipe 60 may move in the direction of removal even when the five-cap nut 90 is screwed in, and if the connecting pipe 60 is tightened with the cap nut 90 without being securely inserted into the tightening portion 82, the When a water flow test or the like is performed, there is a risk that the connecting pipe 60 may come off from the pipe joint.

If such a connecting pipe 60 is disconnected from the piping inside a building, interior materials such as the indoor ceiling, walls, and floors may become dirty due to water leakage.
It takes a lot of time and money to repair.

The present invention is intended to solve the above-mentioned conventional problems, and its purpose is to provide a pipe joint in which the end position of a connecting pipe can be confirmed in a state where the connecting pipe is completely connected.

(Means for Solving the Problems) The pipe joint of the present invention includes a cylindrical guide part that is fitted into a connecting pipe to be connected, and a cylindrical guide part that is connected to the proximal end of the guide part and that is not tightened on the outer peripheral surface. A cylindrical joint body that has a tool engaging part that engages with a tool, and a cylindrical shape that is fitted concentrically with a gap in which a connecting pipe is inserted into the guide part of the joint body, and whose tip part can be reduced in diameter. The tightening part is connected to the proximal end of the part, and the tightening part is connected to the proximal end of the part, and the end of the connecting pipe inserted into the part is located inside the part, and the tool engagement part of the joint body is tightened. A tightening member having a flange portion connected to the joint portion, and a compression member fitted onto the tightening portion to reduce the diameter of a distal end portion of the tightening member. The above-mentioned tightening is characterized in that the flange portion of the member is provided with a connecting tube insertion confirmation hole for confirming the end position of the connecting tube, thereby achieving the above object.

(Example) The present invention will be described below with reference to Examples.

The pipe joint of the present invention has two cylindrical joint bodies 10, as shown in FIG. The joint main body 1o has a cylindrical guide portion 11 in one example portion in the axial direction.

The outer diameter of the guide portion 11 is set to be slightly smaller than the inner diameter of the connection pipe 6o so that the guide portion 11 can be fitted into the connection pipe 6o to be connected. 1 on the outer peripheral surface near the tip of the guide portion 11.
An annular groove 11a is provided in the circumferential direction over the entire circumference. An annular seal member 2o made of an elastic material such as rubber is fitted into the groove 11a.

The joint body 10 has a tool engaging portion 12 having a larger outer diameter than the guide portion 11 on the proximal end side of the guide portion 11 .

The outer peripheral surface of the tool engaging portion 12 has an octagonal shape, for example, so that a tightening tool such as a spanner can be locked therein. As shown in FIG. 2, the outer circumferential surface Q of the tool engaging portion 12 is
A pair of concave portions 12a are provided at two axially symmetrical positions of the tool engaging portion 12.
and 12a are provided.

Each of the concave portions 12.3 opens at the end surface of the tool engaging portion 12 on the guide portion II side, and the inner peripheral edge thereof has an arc shape. The depth of each concave portion 12a is set such that the bottom surface thereof is located on the side of the guide portion 11 side. Except for the part 12a.

A concave groove 12c having an arcuate bottom surface is provided concentrically with the guide portion 11.

A connecting part 13 connected to a device such as a valve or another pipe joint is connected to the tool engaging part 12 of the joint body 10 on the side opposite to the guide part 11 . The connecting portion 13 is concentric with the tool engaging portion 12, has a smaller outer diameter than the tool engaging portion 12, and has a threaded portion of a device or other pipe joint to be connected on its outer peripheral surface. A screw groove 13a into which the screw is screwed is provided.

A cylindrical tightening member 30 is concentrically connected to the tool engaging portion 12 of the joint body 10 so as to fit the guide portion 11 outwardly. A flange portion 31 having a relatively short axial length is connected to the proximal end side of the flange portion 33. The outer circumferential surface of the flange portion 31 has a The flange portion 31 has an octagonal shape that is in contact with the outer circumferential surface of the engaging portion 12.
The guide portion 11 is in contact with the end surface 12b of the guide portion 11 example. The end surface 31a of the flange portion 31 has a tool engaging portion 1.
A pair of protrusions 32 and 32 are provided in a protruding manner to fit into a recessed portion 12a that opens on the end surface 12b of the second protrusion. By fitting each protrusion 32 into each concave portion 12a, the entire member 30 is fitted concentrically into the guide portion 11 of the joint body 10 with a predetermined gap between the lines.

Each protrusion 32 is fitted into each concave portion 12a, and a concave groove 32a that is continuous with a concave groove 12c formed on the outer circumferential surface of the tool engaging portion 12 is provided on the outer circumferential surface of the protrusion 32. A metal slit ring 40 that is partially divided in the circumferential direction is fitted into the concave grooves 1.2c and 32a, and each protrusion 32 of the -J member 30 is This prevents the joint body 10 from coming off the concave portion 1.2B.

The tightening portion 33 of the tightening member 30 is the tightening portion 33 of the fitting body 1
It has a cylindrical shape that is fitted onto the outer circumferential surface of the guide part 11 of 0 with a predetermined gap therebetween, and the inside of the part 33 communicates with a through hole passing through the flange part 31 for tightening. There is. A connecting pipe is inserted into the tightening part 33, and the end face of the connecting pipe 60 comes into contact with the end face 12b of the tool engaging part 12 of the joint body 10, and the end of the connecting pipe 60 forms a flange part. It is located within 31. The tip of the tightening portion 33 is formed in the groove 1.1.1 provided on the outer peripheral surface of the guide portion 11 of the joint body 10. a, and the tip thereof has a plurality of notches 3 extending in the axial direction.
3a are arranged at appropriate intervals in the circumferential direction. With each notch 33a, the tip of the tightening portion 33 can be reduced in diameter by a radial reduction force applied from the outside. A threaded groove 33b is provided on the outer circumferential surface of the tightening portion 33, except for the tip portion where the cutout portion 33a is formed.

As shown in FIG. 3, the flange portion 31 of the tightening member 30 is provided with a pair of connecting tube insertion holes 31c that pass through the flange portion 31 in the radial direction.

Each connecting tube insertion confirmation hole 31c is provided at a symmetrical position with the central axis of the flange portion 31 in between, and therefore, when a connecting tube 60 is inserted into one flange portion 31, the end of the connecting tube can be visually confirmed from the outside through the connecting tube insertion confirmation hole 31c.

A cap nut 50 as a compression member is screwed into the tightening &J portion 33 of the tightening member 30. The bag nut 5o is.

It has a rectangular tube shape with a cylindrical space inside, and on one side of its inner circumferential surface, there is a screw groove 33b provided on the outer circumferential surface of the tightening part 3B of the member 30. A thread groove 51 is formed. The center portion of the inner circumferential surface of the cap nut 50 that is continuous with the thread groove 51 is a tapered surface 52 that gradually reduces in diameter as it moves away from the thread groove 51. The tapered surface 52 contacts the tip of the tightening portion 33 (the tightening member 3o has a notch portion 33a).
Reduce the diameter of the tip. The inner circumferential surface 53 of the side opposite to the threaded groove 51 of the bag 50 is continuous with the tapered surface 52 and has a constant inner diameter. The outer diameter of the connecting pipe 60 is set to be slightly larger than the outer diameter of the connecting pipe 60 that is fitted onto the outer diameter of the connecting pipe 60.

The joint body 10. Tightening part 30 and bag yl
・50 is 1 Usually molded from synthetic resin.

The pipe joint of the present invention having such a configuration is used in the following manner.

When connecting the pipe joint of the present invention to a device such as a valve or another pipe joint, the connecting portion 13 of the joint body 10 is screwed into the threaded portion of the device or other pipe joint to be connected. This screwing is performed by engaging and rotating a tool such as a wrench (t1: l) on the outer peripheral surface of the tool engaging portion 12 of the joint body 10. The tool engaging portion 12 is integrated with the connecting portion 13. Since the tool engaging portion 12 rotates, the connecting portion 13 also rotates integrally with the tool engaging portion 12, so that the threaded groove 1.3a on the outer peripheral surface of the connecting portion 13 is screwed into a predetermined threaded portion. At this time, since the outer circumferential surface of the flange portion 31 of the tightening member 30 adjacent to the tool engaging portion 12 has a short axial length and is approximately flush with the outer circumferential surface of the tool engaging portion, During tightening, since the tool is not engaged only with this flange portion 31, the tool does not directly apply rotational torque only to the flange portion 31.As a result, the tightening is performed only on the member 30. Although the joint rotates integrally with the joint body 10, no rotational force or torque is applied by a tool during tightening, so there is no risk of damage.

When connecting the connecting pipe 60 to a pipe joint connected to a device, etc., tighten the member 30 using the thread groove 3 on the outer circumferential surface of the part 33.
3b is loosely screwed into the threaded groove 51 of the cap nut 50, and the cap nut 50 is inserted into the gap between the tightening portion 33 of the tightening member 30 and the guide portion 11 of the joint body 10. The tube 60 is inserted until its tip abuts the end surface 12b of the tool engaging portion 12 of the joint body 10. At this time, the connecting pipe 6
It is confirmed by the connecting pipe insertion confirmation hole 31c provided in the flange part 31 that the end of the 0 is inserted into the flange part 31 of the t&:1 member 30.

In this state, the seven-bag nut 50 is rotated and the nut 50 is threaded toward the tightening part 33 so that it approaches the flange part 31 of the tightening member 30.

When the cap nut 50 is screw-feeded, the tapered surface 52 formed at the center of the inner circumferential surface of the cap nut 50 tightens at the portion 33.
touches the tip of the After the tapered surface 52 comes into contact with the tip of the tightening section 33, if the bag nand 50 is further rotated and fed in the same direction, the tip of the tightening section 33 provided with the notch 33a will be tapered. The diameter is reduced by the surface 52. As a result, the tip of part 33 is tightened.

As shown in FIG. 4, the outer circumferential surface of the connecting tube 60 is pressed inward over its entire circumference, deforming a portion of the connecting tube 60 and recessing it into a concave shape.

The recessed part of the connecting pipe 60 is the guide part 11 of the joint body 10.
The groove 1 is provided on the outer circumferential surface of the groove B and is fitted into the groove 11a.
It is press-fitted to a sealing member 20 disposed within La. As a result, the connecting pipe 60 is held between the guide part 11 of the joint body 10 and the fastener part 33 of the fastening member 30, and is prevented from being pulled out from between the guide part 11 and the fastener part 33. , simultaneously 1
The sealing member 20 provides a fluid-tight seal between the inner peripheral surface of the connecting pipe 60 and the outer peripheral surface of the guide portion 11 .

The bag naso I-50 is screwed in by engaging the outer peripheral surface of the bag with a tool such as a snowman. The bag nut 5
0 indicates that the tightening is done at the end surface 31b of the 30th flange section 31.
It is pushed in until it touches the. At this time, the flange portion 3
1 is exposed, the end position of the connecting tube 60 can be confirmed through the connecting tube insertion confirmation hole 31c provided in the flange portion 31 at any stage of screwing in the cap nut 50. It is possible.

As the cap nut 50 is screwed in, the tightening is part + A'30.
When tightened, torque is applied, but the protrusion 32 protruding from the flange portion 31 fits into the recess 12a formed in the tool engaging portion 12 of the joint body 10 and is integrated with the joint body 10. Therefore, there is no risk that the member 30 will rotate following the tightening of the two-bag nand 50.

Furthermore, if the cap nut 50 is screwed in excessively, a force is generated that tries to separate the locking member 30 from the joint body 10, but the tightening is caused by the engagement between the protrusion 32 of the member 30 and the tool of the joint body 1o. Since the sling 1-ring 4o is interposed between the joint part 12, there is no risk that the member 3o will move toward the bag nut 1-50 during tightening. Even if the member 30 is tightened, the position of the tip of the part 33 does not shift from the position facing the groove 11a provided on the outer circumferential surface of the guide part 11 of the joint body 10, so that the connection pipe 60 can be tightened. Separation and seal failure between the connecting pipe 60 and the guide portion 11 do not occur.

Although the above embodiment describes a straight pipe type pipe joint, the present invention can also be applied to other pipe joints such as an elbow type,
It can also be applied to cheese type pipe joints and the like.

Further, in the above embodiment, two connecting tube insertion confirmation holes are provided, but one or three or more connecting tube insertion confirmation holes may be provided. Furthermore, in order to make it easier to see the end of the connecting tube from the connecting tube insertion confirmation hole, it is also possible to form the fastening member with a resin of a different color from the outer surface of the connecting tube.

(Effects of the Invention) In this way, the pipe joint of the present invention is such that the end of the connecting pipe inserted between the guide part of the joint body and the clamping part of the clamping member is This can be confirmed by the connecting pipe insertion confirmation hole provided in the flange. Moreover, since there is no risk that the connecting pipe insertion confirmation hole will be covered by the compression member,
By using the compression member, it can be confirmed at any time that the indirect pile pipe has been inserted to a predetermined position until the connecting pipe is completely connected to the joint body.

Sat-time] R1 former r Yaetsutomo- FIG. 1 is a sectional view showing an embodiment of the pipe joint of the present invention.

Figure 2 is a cross-sectional view taken along line -II in Figure 1, Figure 3 is a cross-sectional view taken along line ■-■ in Figure 1, and Figure 4 is a cross-sectional view for explaining the operation of the pipe joint in Figure 1. FIG. 5 is a sectional view of a conventional pipe joint.

DESCRIPTION OF SYMBOLS 10... Joint body, 11... Guide part, 12... Tool engaging part 13... Connection part, 20... Seal member, 3
0... Tightening is a member.

31...Flange part, 31c...Connecting pipe insertion confirmation hole, 32...Protrusion, 33...Tightening part, 40...Slit ring, 50...Cap nut (compression member), 60
...Connecting pipe.

2.

Claims (1)

[Claims] 1. A joint body having a cylindrical guide part that is fitted into a connecting pipe to be connected, and a tool engaging part that is connected to the proximal end of the guide part and whose outer peripheral surface is engaged with a tightening tool, and the joint body. a cylindrical tightening section that is fitted concentrically with a gap in which the connecting tube is inserted into the guide section of the guide section and whose distal end can be reduced in diameter; The end of the connecting pipe to be inserted into the clamping part is located inside the clamping member, and the clamping member has a flange part connected to the tool engaging part of the joint body, and the front end of the clamping part of the clamping member is compressed. a compression member externally fitted onto the tightening portion to increase the diameter thereof, and a connecting tube insertion confirmation hole for confirming the end position of the connecting tube is provided in the flange portion of the tightening member. pipe fittings.