JPH0253673B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coupling device for stainless steel pipes,
In particular, the present invention relates to a joint device in which stainless steel pipes to be joined are watertightly joined at a joint portion and are configured to have a degree of freedom.

[Conventional technology and problems]

Conventionally, the main methods for joining stainless steel pipes are as follows.

How to weld butt pipe ends.

A method in which flanges with threaded holes are fixed at both pipe ends, the flanges are butted together, a mounting bolt is inserted into the threaded hole, and the bolt is tightened with a nut.

A method of using a joint pipe, forming a female thread on the inner periphery thereof, and screwing a male thread formed on the outer periphery of the end of the stainless steel pipe to be joined into the female thread.

A method is known in which a joint pipe is used and the end of a stainless steel pipe to be joined is inserted into the inner periphery of the joint pipe via a packing.

However, in any of the above joint devices, the joint portion is firmly and integrally joined. Therefore, if force is applied in the axial, bending, or rotational direction to the ends of the stainless steel pipes that are being joined, this joint may be damaged or a gap may be created in the joint, allowing water to leak from there. There are problems such as the occurrence of

In addition, in the above-mentioned coupling device, since the coupling pipe and the end of the stainless steel pipe are inserted with almost no gap, there is almost no freedom in the bending direction of the pipe end, and there is no need to properly prevent the pipe from slipping out. It does not have a mechanism, and no special consideration has been given to the packing structure to prevent water leakage.

As mentioned above, conventional coupling devices are not designed to allow the pipe end to move in response to forces acting on the pipe end from various directions, and
There were also problems with sealing properties.

[Means for solving problems]

The present invention proposes a stainless steel pipe joint created to solve these problems.

The present invention provides a stainless steel pipe fitting device in which each pipe end of the stainless steel pipes to be joined to each other is inserted into sockets provided on both sides of the joint, in which a predetermined width l ₁ is provided in the middle part of the joint pipes. At the same time, the tip of the pipe end of the stainless steel pipe inserted from the socket of the joint pipe is locked to the stepped parts formed at both ends of this diameter reduced part, and the pipe end is A gap is formed between the outer periphery of the section and the socket in which the pipe end can move freely, and a part of each socket is bulged outward between the stepped part and the pipe end of the joint pipe to accommodate the packing. A packing having a substantially V-shaped cross section perpendicular to the circumferential direction is stored in each packing storage part, and the inner peripheral tip of the V-shape is directed toward the tip of the pipe end of the stainless steel pipe. An annular member is integrally provided at the end of the joint pipe, an arcuate locking member is provided in an annular recess formed on the inner periphery of the annular member, and the locking member is made of stainless steel. The locking member is configured to be engaged with a concave groove on the outer periphery of the end of the steel pipe with a gap therebetween, and to be able to press the locking member from the outside by a screw threaded into the annular member.

Further, the present invention reduces the diameter by a predetermined width in the middle part of the joint pipe, and increases the diameter by a predetermined width _l2 from the pipe end of the joint pipe toward the step portions formed at both ends of the diameter-reduced part. to form a packing storage part, and the tip of the pipe end of the stainless steel pipe inserted from the pipe end of the joint pipe is locked to the step part, and each of the packing storage parts has a section approximately perpendicular to the circumferential direction. A V-shaped packing is housed, and the V-shaped inner peripheral tip is arranged toward the tip of the pipe end of the stainless steel pipe, and an annular member is integrally attached to the pipe end of the diameter-enlarged joint pipe. An arc-shaped locking member is disposed in an annular recess formed on the inner periphery of the annular member, and the locking member is engaged with a groove on the outer periphery of the end of the stainless steel pipe. The locking member is configured to be able to be pressed by a screw threaded into the locking member.

[Effect]

In the above structure, the ends of the stainless steel pipes inserted into the sockets of the joint pipe are fitted and joined with a gap between them, so in this joint pipe, the ends of the stainless steel pipes are connected to each other with a gap. It also has a degree of freedom in the direction of rotation and the direction of bending.

Moreover, even with such movement of the pipe end in the joint pipe, water leakage does not occur due to the pointed inner circumferential tip of the packing having a V-shaped cross section. Furthermore, the present invention has an arc-shaped locking member disposed inside an annular member provided integrally with the joint pipe, and engages with a groove on the outer periphery of the pipe end via a gap.
It is possible to reliably prevent each tube end from being disengaged from the joint pipe while maintaining the movability of the stainless steel pipe relative to the joint pipe.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a first embodiment of the present invention.

In the figure, 1 and 1 are two stainless steel pipes to be joined to each other (hereinafter simply referred to as steel pipes),
2 is an end of each steel pipe 1, 3 is a joint pipe for joining each steel pipe 1, and 4 is a socket of this joint pipe 3.

As shown in the figure, the pipe end 2 of this steel pipe 1 is
is inserted into the inner side of the socket 4 of the joint pipe 3 with a gap S sufficient to allow the pipe end 2 to be movable.

Further, the joint pipe 3 has a diameter-reduced portion 7 having an appropriate width l ₁ approximately in the center, and has a reduced-diameter pipe wall, and a step portion 5 is formed at the end of the portion 7 so that the joint pipe 3 can be joined to each other. The pipe tip 6 of the steel pipe 1 is in contact with the stepped portion 5.

Furthermore, by molding a part of the socket 4 of the joint pipe 3 outward, a packing storage part 8 is formed inside the socket 4, and the packing storage part 8 is made of an elastic material such as rubber. Annular packing 9
is stored.

This packing 9 has a cross section perpendicular to the circumferential direction.
The gasket 9 has a substantially V-shape, and the pointed inner circumferential distal end 10 of the packing 9 is disposed toward the pipe distal end 6 of the steel pipe 1 and comes into pressure contact with the outer circumference of the steel pipe 1. ing.

In this first embodiment, the pipe ends 2 of the respective steel pipes 1 to be joined to each other are inserted into the socket 4 of the joint pipe 3 with a gap S therebetween, and the pipe tips 6 are brought into contact with the stepped part 5. There is.

In addition, the packing storage part 8 is attached to the joint pipe 3 in this way.
In order to form the step portion 6, a diameter expanding means and a diameter reducing means using an arbitrary mold are used.

Furthermore, in the above-mentioned joint pipe 3, in order to reliably prevent the pipe end 2 of the steel pipe 1 from disengaging from the joint pipe 3, a locking member 19 shown in FIG.
In the figure, reference numeral 11 denotes an annular member fixed to the end of the joint pipe 3. An annular recess 13 is formed on the inner periphery of the annular member 11, and an elastic locking member 14, such as an arc-shaped split ring, is fitted into the annular recess 13. .

This elastic locking member 14 has a spring property in the direction of diameter expansion and is in contact with the bottom of the annular recess 13 . Further, on the outer diameter side of this annular recess 13, an annular member 1 is provided.
A screw hole 15 is formed through the peripheral wall of the annular member 11, and a plurality of screw holes 15 are formed at appropriate intervals in the circumferential direction of the annular member 11.

On the other hand, on the outer periphery of the tube end 2 of the steel pipe 1, a groove 18 is formed in the circumferential direction so that the inner circumferential edge of the elastic locking member 14 can be engaged with a gap therebetween.

Therefore, according to this locking means 19, the gap S is formed in the annular member 11, and the pipe end 2 of the steel pipe 1 is closed.
Insert it and turn the setscrew 16 to tighten it.
The diameter of the arc-shaped elastic locking member 14 is reduced by the tip of the set screw 16, and the inner peripheral edge of the elastic locking member 14 is connected to the steel pipe 1.
Fits into the concave groove 18 of the tube end 2 by an appropriate size.
Therefore, there is a slight gap between the annular locking member 14 and the bottom of the groove 18.

By providing the locking means 19, when a certain force in the axial direction is applied to the tube end 2, the elastic locking member 14 engages with the edge of the groove 18, and the steel tube 1 is released from the annular member 11. It does not move in the direction of unfitting or in the opposite direction. Moreover, the degree of freedom of the pipe end 2 of the steel pipe 1 is maintained due to the gap between the annular member 11 and the groove bottom of the groove 18.

According to the first embodiment, when the water pressure in the joint pipe 3 is applied to the inner peripheral tip of the V-shaped packing 9, the both ends of the V-shaped packing 9 act to expand in the packing housing 8, Fluid such as water flowing inside the steel pipe 1 does not leak. Moreover, due to the existence of the gap S, the tube end portion 2 of each steel tube 1 is rotatable relative to the joint tube 3, and the tube end portion 2 of each steel tube 1 is rotatable in a direction away from the axis of the joint tube 3 with the tube tip portion 6 as a fulcrum. Each steel pipe 1 is configured to be movable in the bending direction.

Furthermore, since the elastic locking member 14 is fitted into the groove 18, the steel pipe 1 is prevented from moving in the axial direction below a predetermined axial force. When the above force is applied in the axial direction, the inner edge of the elastic locking member 14
Since the steel pipe 1 moves in the axial direction while destroying both side edges of the steel pipe 8 and crushing the peripheral wall of the steel pipe 1, the joint pipe 3 is not destroyed. For this purpose,
The fitting dimension of the elastic locking member 14 into the groove may be set appropriately.

Next, FIG. 3 shows a second embodiment of the present invention.

In the joint pipe 3 shown as the second embodiment, a stepped part 5 is formed at the end of the reduced diameter part 7 located in the middle, and the pipe end 4a of the joint pipe 3 is
A gasket 9 having a V-shaped cross section is housed in a gasket housing portion 8 formed on the side of which the diameter is expanded over a range of _l2 . And the joint pipe 3 whose diameter has been expanded
One end of the annular member 11 is inserted into the inside of the tube end 4a and fixed by welding. The other configurations are the same as in the first embodiment.

Therefore, according to the configuration of this second embodiment,
By inserting the pipe end 2 of the steel pipe 1 into the socket 4 of the joint pipe 3 and tightening the set screw 16, the steel pipe 1
is prevented from being disengaged from the joint pipe 3, watertightness is reliably maintained, and the degree of freedom relative to the joint pipe 3 is also maintained.

〔Effect of the invention〕

According to the joint device of the present invention having the above configuration, the stainless steel pipes to be joined via the joint pipe have a gap formed between the pipe ends and the joint pipe, and a V-shape. The pointed inner circumferential tip of the gasket, which has a shaped cross section, is disposed toward the tube tip.

Therefore, in this joint device, the degree of freedom is maintained in the tube end, and the tube end is movable in the rotating direction and bending direction. When a range of forces is applied, this joint can be prevented from rupturing and fluid leaking therefrom. Moreover, even though this joint part has such a degree of freedom, watertightness is reliably maintained by the packing.

Furthermore, as a locking means, a locking member is disposed inside an annular member provided integrally with the joint pipe, and this locking member is engaged with a groove on the outer periphery of the stainless steel pipe through a gap. Therefore, the stainless steel pipe can maintain the above-mentioned degree of freedom relative to the joint pipe, and can reliably prevent the stainless steel pipe from being unfitted from the joint pipe. Moreover, when an axial force of a certain level or more is applied, the locking member destroys the side edges of the groove, allowing the stainless steel pipe to move in the axial direction, and the joint pipe is not destroyed. Furthermore, the locking means made of the annular member and the locking member can be easily attached to the joint pipe, which has the effect of facilitating maintenance and management of the joint location.

[Brief explanation of drawings]

The drawings show embodiments of the present invention; FIG. 1 is a sectional view of the first embodiment of the joint device according to the invention, FIG. 2 is a sectional view of the locking means, and FIG. 3 is a sectional view of the second embodiment. It is a diagram. 1...Stainless steel pipe, 2...Pipe end, 3...
…Joint pipe, 4…Socket, 8…Packing storage section,
9...Packing, 10...Inner peripheral tip, 11...
Annular member, 14...locking member, 16...set screw, 18...concave groove, S...gap.

Claims (1)

[Scope of Claims] 1. In a stainless steel pipe coupling device in which each pipe end of stainless steel pipes to be joined to each other is inserted into sockets on both sides of the joint pipe, a predetermined width is provided in the middle part of the joint pipe. l A reduced diameter part is formed over ₁ , and the tip of the pipe end of the stainless steel pipe inserted from the socket of the joint pipe is locked in the stepped parts formed at both ends of this reduced diameter part, and A gap is formed between the outer periphery of the pipe end and the socket so that the pipe end can move freely, and a part of each socket bulges outward between the stepped part and the pipe end of the joint pipe. A packing storage part is formed, and each packing storage part stores a packing whose cross section perpendicular to the circumferential direction is approximately V-shaped, and the V-shaped inner peripheral tip is connected to the tip of the pipe end of the stainless steel pipe. an annular member is integrally provided at the pipe end of the joint pipe, and an arcuate locking member is disposed in an annular recess formed on the inner periphery of the annular member. is engaged with a groove on the outer periphery of the pipe end of the stainless steel pipe with a gap therebetween, and the locking member is configured to be pressable by a screw threaded into the annular member. fitting device. 2. In a stainless steel pipe fitting device in which each end of the stainless steel pipes to be joined to each other is inserted into sockets on both sides of the joint pipe, a reduced diameter part is installed in the middle of the joint pipe over a predetermined width. At the same time, the diameter is expanded by a predetermined width l ₂ from the pipe end of the joint pipe toward the step portions formed at both ends of the diameter-reduced part to form a packing storage part, and from the pipe end of the joint pipe The tip of the pipe end of the inserted stainless steel pipe is locked to the step part, and a packing having a substantially V-shaped cross section perpendicular to the circumferential direction is stored in each of the packing storage parts,
In addition, the V-shaped inner circumferential tip is arranged toward the tip of the pipe end of the stainless steel pipe, an annular member is integrally provided at the pipe end of the diameter-enlarged joint pipe, and the inner circumference of the annular member is An arc-shaped locking member was disposed in the formed annular recess, and this locking member was engaged with a groove on the outer periphery of the end of the stainless steel pipe with a gap, and was screwed into the annular member. A stainless steel pipe coupling device, characterized in that the locking member can be pressed from the outside with a screw.