JPH09144962A - Seal structure of fluid pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly perform insertion of an inserting port without using any jig by providing the tip on a seal ring, bringing the tip in contact with a stopper part when the inserting port is inserted into a socket part, and extending the diameter of the seal part. SOLUTION: A seal ring 3 is previously mounted on the inner circumference of a socket part 10 of a coupling main body 1, the inside diameter of a seal part 31 of the seal ring 3 is a little smaller than the outside diameter of a second fluid pipe 2, and the seal ring 3 tends to move together with the second fluid pipe 2 toward the innermost part of the socket part 10. Since the seal part 31 is expanded outward in the radial direction and the diameter of it is extended by compressive load after the tip 32 of the seal ring 3 is brought into contact with a stopper part 11, the compression margin of the seal part 31 is decreased. Therefore, the second fluid pipe 2 can be smoothly inserted without using any jig for pipe insertion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pipe sealing structure for sealing fluid pipes such as water pipes and gas pipes.

[0002]

2. Description of the Related Art As a sealing structure for a fluid pipe, three types shown in FIG. 9 are widely used. FIG.
In the A-type and K-type sealing structures of (a) and (b), since the seal ring 100 is smaller than the outer diameter of the insertion opening 101 by several mm or more, the inner diameter of the seal ring 100 is expanded to the insertion opening 101. Must be worn. In addition, the push ring 102 pushes the seal ring 100 into the socket 103,
Since it is necessary to press the entire inner and outer circumferences of the seal ring 100 against the receiving portion 103 and the insertion portion 101, the bolt 1
It is necessary to tighten 04 with a large tightening torque, and torque management is also necessary to obtain the desired sealing performance. Further, since the seal ring 100 is compressed and deformed by a large force, an external force applied to the fluid pipe becomes large, which is not preferable as a sealing structure for a fluid pipe having low strength such as a vinyl chloride pipe or an asbestos pipe.

On the other hand, the T-shaped seal structure shown in FIG.
After attaching the seal ring 100 to the receiving portion 103 in advance,
Since the insertion opening 101 is inserted into the receiving opening 103, the above-described problems of the A type and the K type do not occur. However, in T type, in order to obtain sufficient sealing performance, the seal ring 1
Since the compression allowance of 00 is sufficiently large, the insertion port 10
Since the resistance at the time of inserting 1 into the receiving portion 103 is large, a jig for inserting a tube is required.

As described above, the conventional seal structure has a drawback that the workability is poor, such as the need for torque management or the use of a jig.

The present invention has been made in view of the above circumstances, and its main object is to provide a seal structure for a fluid pipe which can improve workability.

[0006]

The structure of the present invention will be described with reference to FIGS. 2 and 3 showing the first embodiment. According to the present invention, the insertion portion 20 of the second fluid pipe 2 is inserted into the receiving portion 10 of the first fluid pipe 1, and two fluid pipes are provided by the seal ring 3 interposed between the two fluid pipes 1 and 2. The present invention relates to a fluid pipe sealing structure for sealing between the first and second parts. The present invention is provided with the push ring 4 that pushes the seal ring 3 toward the back of the receiving portion 10. The receiving portion 10 is provided with a stopper portion 11 that protrudes inward at the back of the receiving portion 10, and a tapered surface 14 formed at a position apart from the stopper portion 11. The seal ring 3 is pushed by the push wheel 4 toward the inner side of the receiving portion 10 to seal between the inner peripheral surface of the receiving portion 10 and the outer peripheral surface of the insertion portion 20.
And has an inner diameter larger than the inner diameter of the seal portion 31 and the outer diameter of the insertion portion 20, and when the insertion portion 20 is inserted into the receiving portion 10, the stopper portion 11 comes into contact with the seal portion 31 to receive it. The tip portion 32 that suppresses the movement of the mouth portion 10 to the back is provided. The tapered surface 14 of the receiving portion 10 and the sealing portion 3
A gap 15a is provided between the seal portion 31 and the seal portion 31 so that the seal portion 31 escapes radially outward when the insertion portion 20 is inserted into the receiving portion 10.

When inserting the second fluid pipe 2 into the first fluid pipe 1, the insertion portion 20 is inserted into the receiving portion 10 with the seal ring 3 already attached to the inner periphery of the receiving portion 10. To do. In this respect, the connection structure is similar to that of the conventional T type, but the push ring 4
As shown in FIG. 3, since the seal portion 31 is pushed by the push ring 4 along the tapered surface 14 to achieve the seal, the inner diameter of the seal portion 31 in FIG.
Even if the value is close to the outer diameter of 0, a sufficient sealing function can be exhibited. On the other hand, at the time of the insertion, the seal portion 31 of the seal ring 3 tries to move toward the back of the receiving portion 10 together with the insertion portion 20, but the tip portion 32 of the seal ring 3 moves toward the receiving portion 10. Since the seal portion 31 abuts on the stopper portion 11 and expands in the radial direction by the compressive load, the compression margin of the seal portion 31 decreases, so that the insertion opening 20 can be smoothly inserted with a small force. can do.

According to the second aspect of the present invention, a guide surface 11a is formed near the stopper portion 11, the diameter of which becomes smaller toward the stopper portion 11, and when the seal ring 3 is pushed in by the push ring 4 as shown in FIG. In addition, the tip 32 has the guide surface 1
By being guided by 1a and bending inward, the insertion portion 20
Is pressed against the outer peripheral surface to seal between the two fluid pipes 1, 2.

According to the second aspect of the invention, the push wheel 4 shown in FIG.
When a large compressive load is applied to the seal ring 3 in the pipe axis direction C by the, the tip 32 is bent inward by being guided by the guide surface 11a as shown in FIG. Therefore, the tip 32 is
The two fluid pipes 1 and 2 are sealed by being pressed against the stopper portion 11 and the outer peripheral surface of the insertion opening 20. On the other hand, the seal portion 31 is pushed into the inside, and thus is brought into pressure contact with the tapered surface 14 and the insertion portion 20 so that the two fluid pipes 1, 2.
Seal between the two. Therefore, two-stage sealing can be achieved, and unlike the conventional A-type and K-type, the entire inner and outer circumferences of the seal ring 3 are covered with the receiving portion 10 and the insertion portion 20.
Since the pressure wheel 4 is not pressed against, it is possible to reduce the force with which the push wheel 4 is pushed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a joint J to which the present invention is applied.
The joint J is composed of a joint body 1, a seal ring 3, a push ring 4, a taper bolt 5 and a stopper 6 that form a first fluid pipe. As shown in this figure, the main joint J is a state in which a seal ring 3, a push ring 4, a stopper 6 and the like are set in the joint main body 1, and the insertion opening 20 of the second fluid pipe 2 shown by the alternate long and short dash line in FIG. Can be inserted.

For example, two taper bolts 5 are screwed in the radial direction of the joint body 1, and a conical portion 50 at the tip thereof is provided.
Is used to push the rear end surface 40 of the push wheel 4. The push ring 4 pushes the seal ring 3 toward the inner side of the receiving portion 10 of the joint body 1, and as shown in FIG. 4, is entirely formed in an annular shape. An outwardly projecting portion 41 that slightly projects outward in the radial direction is formed in a portion of the push wheel 4 that contacts the taper bolt 5 over a part in the circumferential direction.

The seal ring 3 shown in FIG. 2 has a central seal portion 31 in the pipe axial direction C and a distal end portion 32 on the inner side of the joint body 1.
On the side opposite to the tip end portion 32, the pressed portion 33 that comes into contact with and is pushed by the push wheel 4 is integrally formed, and the whole is formed in an annular shape. The seal portion 31 is, for example, the first seal surface 3 having an arc-shaped cross section that comes into contact with the inner peripheral surface of the receiving portion 10.
It is formed in an O-ring shape having 1a (FIG. 5D) and a second seal surface 31b (FIG. 5D) having an arc-shaped cross section that contacts the outer peripheral surface of the insertion opening 20. On the other hand, the tip 32
Are formed so as to project from the seal portion 31 toward the back of the joint body 1.

The receiving part 10 has a circular ring-shaped stopper part 11 which projects inward in the inner part of the receiving part 10 over the entire circumference.
With the first, second and third accommodation spaces 13,
15 and 16 are formed. The first accommodation space 13 is formed from the stopper portion 11 toward the opening end portion 12 of the receiving portion 10, and accommodates the tip end portion 32 of the seal ring 3. The second accommodating space 15 is formed on the inner peripheral side of the tapered surface 14 that is continuous with the first accommodating space 13 and has a diameter that increases toward the opening end portion 12, and accommodates part or all of the seal portion 31. A gap 15a is provided between the seal portion 31 and the tapered surface 14. The third accommodation space 16 is connected to the second accommodation space 15 and accommodates the pressed portion 33 of the seal ring 3 and the push wheel 4. The receiving portion 10 forming the third accommodation space 16 is provided with a step portion 17, and in the piping state of FIG. 3, the outward protruding portion 41 of the push wheel 4 closely faces the step portion 17 and faces the step portion 17. ing.

As shown in FIG. 4, an engaged projection 18 that projects inward is formed at the open end 12 of the receiving portion 10. The engaged projection 18 has a notch 18a that is partially cut out in the circumferential direction, and the outward projection 41 of the push wheel 4 is fitted to the notch 18a so that the push wheel 4 is fixed to the joint body 1.
Insert inside of.

The seal portion 31 of the seal ring 3 shown in FIG.
By being pushed from the second accommodation space 15 toward the first accommodation space 13 by the push wheel 4, the tapered surface 14 of the receiving portion 10 is pushed.
And to contact the outer peripheral surface of the insertion opening 20 to seal between the two pipes 1 and 2. The inner diameter of the seal portion 31 is
It is set to a value slightly smaller than the outer diameter of the insertion portion 20. The outer diameter of the seal portion 31 is set to a value larger than that of the largest diameter portion of the tapered surface 13a of the first housing space 13. The taper surface 13a on the back side and the taper surface 14 described above are connected to each other, and the taper surface 1 on the back side is formed.
3a has a gentler slope.

The tip portion 32 of the seal ring 3 has an inner diameter larger than the inner diameter of the seal portion 31 and the outer diameter of the insertion portion 20, and is the same as the tapered surface 13a of the first accommodation space 13 of the receiving portion 10. It has an outer peripheral surface 32a having a gap therebetween. When the insertion portion 20 is inserted into the receiving portion 10, the tip portion 32 comes into contact with the stopper portion 11 and suppresses the movement of the seal portion 31 into the receiving portion 10. On the other hand, the tip 3
As shown in FIG. 3, when the seal ring 3 is pushed in by the push ring 4, the guide surface 2 is pressed against the stopper portion 11 and has a circular arc-shaped guide surface 1 formed in the vicinity of the stopper portion 11.
1a is guided inward in the radial direction and falls inward to insert portion 20.
The two pipes 1 and 2 are sealed by being pressed against the outer peripheral surface of the pipe.

The retaining member 6 shown in FIG. 1 has an engaging portion 60 that engages with the engaged projection 18 and an engaging element 61 that fits into the outer periphery of the second fluid pipe 2 in two parts. Cage, assembly bolt 6
A well-known structure for preventing the second fluid pipe 2 from coming out by tightening 2 is provided.

Next, a method of connecting the joint body 1 and the second fluid pipe 2 will be described. First, in the factory,
The seal ring 3, the push ring 4, the taper bolt 5 and the stopper 6 are assembled to the joint body 1 to assemble the joint J.
At this time, the taper bolt 5 is screwed loosely. At the construction site, the assembled joint J is inserted into the second fluid pipe 2 or the second fluid pipe 2 is inserted into the joint J. At this time, the seal ring 3 is preliminarily attached to the inner periphery of the receiving portion 10 of the joint body 1 of FIG. 2, and the inner diameter of the seal portion 31 of the seal ring 3 is larger than the outer diameter of the second fluid pipe 2. Is also slightly smaller, the seal ring 3 is the second fluid pipe 2.
At the same time, it tries to move toward the back of the mouthpiece 10. However, the tip portion 32 of the seal ring 3 comes into contact with the stopper portion 11, and the seal portion 31 expands radially outward due to the compressive load and expands in diameter, so that the compression margin of the seal portion 31 becomes small. Therefore, unlike the conventional T type, the second fluid pipe 2 can be smoothly inserted without using a pipe insertion jig.

After inserting the second fluid pipe 2, when the taper bolt 5 is screwed by hand until it comes into contact with the end face of the boss 19 in FIG.
The push wheel 4 is pushed inward by the conical portion 50 of the taper bolt 5. As a result, the seal ring 3 is compressed in the tube axial direction C, the seal portion 31 is deformed so as to be bulged outward in the radial direction and then bulged inward, and the tip portion 32 is also deformed.
Is guided by the guide surface 11a and bends inward. Therefore, the tip portion 32 is pressed against the stopper portion 11 and also pressed against the outer peripheral surface of the insertion portion 20 to seal between the two pipes 1 and 2.

On the other hand, the seal portion 31 swells inward and outward in the radial direction and is pushed from the second accommodation space 15 toward the first accommodation space 13 as described above, whereby the tapered surface 1 is formed.
4 and the insertion port 20 are pressed to seal between the two pipes 1 and 2. As described above, in this joint J, two stages of sealing can be achieved, and unlike the conventional A type and K type, since the tip portion 32 is bent inward to achieve sealing, a large pushing force is required. Surface pressure can be generated, and therefore, the axial force of the taper bolt 5 that pushes the push wheel 4 is reduced. Therefore, the tightening torque of the taper bolt 5 becomes smaller as the taper bolt 5 is screwed in by hand. In particular, if the taper bolt 5 is brought into contact with the boss 19 as in this embodiment, torque management becomes unnecessary.

As described above, the present joint J has the seal ring 3
Need not be expanded in the radial direction and attached to the pipe, and the second fluid pipe 2 can be smoothly inserted into the joint J without using a jig, and the tightening torque of the taper bolt 5 is small. Moreover, since torque management is unnecessary, workability is significantly improved. On the other hand, since the seal can be achieved not only by the seal portion 31 but also by the tip portion 32,
Sufficient water tightness is obtained. Moreover, since the contact area between the seal ring 3 and the second fluid pipe 2 is small, the external force applied to the second fluid pipe 2 is smaller than that of the A-type and K-type, so that it is suitable for vinyl chloride pipes and asbestos pipes, which are weak in strength. It can be preferably used.

Further, in the present joint J, since the tip end portion 32 of the seal ring 3 contacts the stopper portion 11 and the insertion opening portion 20 for sealing, the portion where the pressure is applied after passing water is the stopper portion 11 in FIG. And a small range A between the outer peripheral surface of the insertion opening 20 and the outer peripheral surface of the insertion opening 20. That is, the pressure of the fluid does not work in the entire first accommodation space 13 of the receiving portion 10. Therefore, the push wheel 4 can be downsized, and the number of the taper bolts 5 supporting the push wheel 4 can be reduced.

If the push wheel 4 is not provided with the outward projection 41 shown in FIG. 4, the push wheel 4 tries to rotate in the direction of the arrow B about the axis L of the two taper bolts 5 in the receptacle 10. To do. However, in the present embodiment, the push wheel 4 is provided with the outwardly projecting portion 41, and the outwardly projecting portion 41 is used as the receiving portion 10 of FIG.
Since they are close to and face the stepped portion 17 of the presser wheel 4 even if the pusher wheel 4 is supported by the two taper bolts 5,
There is no possibility of rotation within 0.

By the way, in the present embodiment, the tip portion 32 of the seal ring 3 has a function of sealing, but the invention of claim 1 does not necessarily require such a function.

Further, in the first embodiment, the seal ring 3
Although the seal portion 31 of FIG. 6 has an O-ring shape, the seal portion 31 does not need to have an O-ring shape in the present invention.
Second sealing surface 31b having a corrugated and arcuate cross section as shown in FIG.
May be used.

Further, although the pressed portion 33 is provided in the first embodiment, in the present invention, the tip portion 32 is provided as shown in FIG.
The seal ring 3 may be configured by the seal portion 31 and the seal portion 31.

Further, in the first embodiment, the push wheel 4 of FIG. 1 is mounted inside the receiving portion 10, but in the present invention, as shown in FIG. 8, the push wheel 4 of K type or A type is mounted. The structure may be. Further, it is not necessary to push the push wheel 4 with the taper bolt 5 (FIG. 1), and the push wheel 4 can be used with the tightening bolt 5A as shown in FIG.
You may push in. Further, the number of the taper bolts 5 in FIG. 3 is not limited to two. Further, in the first embodiment, the taper bolt 5 contacts the boss 19 and the push wheel 4
Although the pushing amount of the pushing wheel 4 is regulated, the outward protrusion 41 of the pushing wheel 4 may be in contact with the step portion 17 to regulate the pushing amount of the pushing wheel 4.

Further, in the first embodiment, after the seal ring 3 is attached to the receiving portion 10 in advance, the insertion portion 20 is inserted into the receiving portion 10. However, like the A type and the K type, Part 10
It is also within the scope of the present invention to employ a construction method in which the seal ring 3 is inserted into the receiving portion 10 and then pushed after the insertion portion 20 is inserted into the receiving portion 10. Further, in the present invention, the retaining member 6 is not always necessary and may be provided as necessary, and various structures such as a push screw type can be adopted as the structure.

[0029]

As described above, according to the present invention,
When the tip portion is provided on the seal ring, the tip portion abuts the stopper portion of the receiving portion when the insertion portion is inserted into the receiving portion, the seal portion expands in diameter, and after the insertion portion is inserted, Since the seal ring is pressed by pressing the seal ring with the push ring and the seal portion is pushed in, the compression margin of the seal portion is extremely small when the insertion portion is inserted. Therefore, unlike the T type, a jig is not required. The insertion part can be smoothly inserted.
Therefore, the workability is improved.

Further, when the seal ring is pushed in by the push ring, the tip portion comes into pressure contact with the stopper portion and also falls inward and comes into pressure contact with the outer peripheral surface of the insertion opening portion. Since it can be sealed at two places, it exhibits a high sealing function. On the other hand, unlike the A-type and K-type, since the tip portion is bent to achieve sealing, it is sufficient to press the push ring with a small force, so that the tightening torque of the bolt is reduced and the workability is remarkably improved.

[Brief description of the drawings]

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

FIG. 2 is a vertical cross-sectional view showing the structure of a receiving portion when a second fluid pipe is inserted.

FIG. 3 is a vertical cross-sectional view showing a structure of a receiving portion in a piped state.

FIG. 4 is an exploded perspective view showing a receiving portion, a seal ring, a push ring, and the like.

5A is a front view of the seal ring, FIG. 5B is a rear view of the same, FIG. 5C is a plan view of the same (left side view, right side view or bottom view), and FIG. It is a dd line sectional view.

FIG. 6 is a sectional view showing a third embodiment of the seal ring.

FIG. 7 is a sectional view showing a fourth embodiment of the seal ring.

FIG. 8 is a sectional view of an essential part showing a fourth embodiment.

FIG. 9 is a cross-sectional view showing a conventional general seal structure.

[Explanation of symbols]

 1: Joint body (first fluid pipe) 10: Receptacle portion 11: Stopper portion 11a: Guide surface 12: Opening end portion 13a: Tapered surface 14: Tapered surface 15a: Gap 2: Second fluid pipe 20: Insertion portion 3: seal ring 31: seal portion 31a: first seal surface 31b: second seal surface 32: tip portion 4: push ring

Claims (3)

[Claims] 1. A fluid which inserts an insertion portion of a second fluid pipe into a reception portion of a first fluid pipe and seals between the two fluid pipes by a seal ring interposed between the two fluid pipes. A sealing structure for a pipe, wherein a push ring that pushes the seal ring toward the back of the receiving portion is provided, and the receiving portion includes a stopper portion that protrudes inward at the back of the receiving portion, and the stopper. And a taper surface which is formed at a position separated from the portion and is close to the outer peripheral surface of the seal ring, and the seal ring is pushed toward the back of the receiving portion by the push ring, thereby A seal part for sealing between the inner peripheral surface and the outer peripheral surface of the insertion part, and an inner diameter larger than the inner diameter of this seal part and the outer diameter of the insertion part,
A tip end portion that prevents the seal portion from moving to the inside of the receiving portion by contacting the stopper portion when the insertion portion is inserted into the receiving portion, and a tapered surface of the receiving portion. A seal structure for a fluid pipe, wherein a gap is provided between the seal part and the seal part so that the seal part escapes radially outward when the insert part is inserted into the receiving part. 2. The guide surface according to claim 1, wherein a guide surface is formed in the vicinity of the stopper portion, the diameter of which decreases as it approaches the stopper portion, and the tip portion is formed when the seal ring is pushed by the push ring. In addition, a fluid pipe sealing structure for guiding between the two fluid pipes by being pressed against the outer peripheral surface of the insertion port by being guided by the guide surface and bending inward. 3. The seal portion according to claim 1, wherein the seal portion has a first seal surface having an arcuate cross section that contacts the inner peripheral surface of the receiving portion, and a cross section circle that contacts the outer peripheral surface of the insertion portion. A sealing structure for a fluid pipe having an arc-shaped second sealing surface.