JP2003307290A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint into which a resin pipe can be easily inserted by a single operation while the inserted pipe reliably exerts a draw-out preventing force and is connected in an extremely stable state, preventing the leak of water. <P>SOLUTION: A joint body 10 is constituted of a cylindrical joint member 11 and a lid member 12. Seal rings 17, 18 and lock rings 15, 16 for preventing the fall of an inserted pipe 13 are placed inside the joint body 10. The lock rings 15, 16 can rotate together with the inserted pipe 13. <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 to which a resin pipe widely used for water supply, hot water supply, cooling and heating systems, fire extinguishing equipment and the like can be connected with one touch.

[0002]

2. Description of the Related Art This resin pipe is widely applied to water supply, hot water supply, heating and cooling pipes in buildings, floor heating of detached houses, etc., and pipe fittings for connecting the resin pipes are pipes. It is indispensable that the connection work with the pipe is easy, while the function of preventing the pipe from coming off is reliable and there is no risk of water leakage.

Conventionally, as shown in FIG. 12 (a), between a pair of lock rings 3a and 3b, which are positioned and fixed by screwing a pressing body 2 into a joint body 1, a distance of 0.3 to 1.0 mm is provided. There is a joint in which a spacer 4 is interposed to prevent the resin pipe 5 from coming off (see, for example, Patent Document 1).

On the other hand, there is one in which a projection is provided in the vicinity of the tips of a plurality of claws facing the front side in the insertion direction of the pipe (see, for example, Patent Document 2). Further, there is one in which a notch portion is formed at both ends of a restriction piece provided on a lock ring so as to correspond to the depth of biting into the pipe (see, for example, Patent Document 3), and further, an inner edge that bites into the pipe is provided. There is a lock ring that is chamfered in a portion that restricts the bite (see, for example, Patent Document 4).

[0005]

[Patent Document 1] Japanese Patent No. 3165109

[Patent Document 2] Japanese Patent No. 2685105

[Patent Document 3] Japanese Patent No. 2945653

[Patent Document 4] Japanese Patent No. 2920146

[0006]

However, the invention described in Patent Document 1 is related to the pair of lock rings 3a and 3a.
b is the receiving surface 1a in the joint body 1 due to the tip of the pressing body 2.
Since it is positioned and fixed so as not to move in the axial direction and the circumferential direction on the upper side, as shown in FIGS. 13 (a) and 13 (b), when the pipe 5 is inserted, the claws 6a of the lock rings 3a, 3b,
Since only 6b is deformed, the pipe must be inserted against the elastic force of the claw, and the insertion force becomes large, making it difficult to insert the pipe. Moreover, when the inserted pipe 5 rotates, the outer periphery of the pipe 5 may be damaged in the circumferential direction, and the pipe 5 may be cut from that portion.

In particular, since the resin pipe 5 is affected by elongation, the deformation method is different between the lock ring 3b on the pipe insertion port side and the lock ring 3a on the back side.
As shown in (b), since the extension of the pipe 5 is larger on the insertion port side, the deformation amount of the lock ring 3b following the extension is inevitably larger. As a result, as shown in FIG. 12C, the amount of bite of the lock ring 3b on the insertion opening side into the pipe 5 is always excessive, and the pipe 5 may be cut from that portion. In this case, if the number of lock rings is increased and the amount of individual deformation is reduced and this point is solved, it becomes extremely difficult to insert the pipe.

The inventions described in Patent Document 2 and Patent Document 3 are intended to limit the bite into the pipe by the shape of the lock ring, but in reality, the lock plate is a metal thin plate. However, there are variations in the effect of preventing the soft resin pipe from digging into the soft resin pipe, and the biting occurs at the restriction site, which may result in cutting of the pipe. Of these, in the invention of Patent Document 3,
By forming a slit between each claw, it is intended to allow the expansion of each claw at the time of inserting the pipe to smoothly insert the pipe, but in reality, the slit alone may not be sufficient, In some cases, the pipe had to be inserted into the fitting with a strong force to force the pawl to spread.

Further, according to the invention described in Patent Document 4, the chamfering to the inner end edge that bites into the resin pipe is effective for scratches at the time of inserting the pipe, but the chamfering is limited to the part that limits the biting. However, as in the case of the above example, the effect varies, and as a result, there is a risk of cutting into the resin pipe and cutting the pipe.

The present invention was developed in order to solve the problems of conventional one-touch pipe joints. The purpose of the present invention is to allow the lock ring and the inserted pipe to rotate together and to twist the pipe. In addition, the insertion pipe can be easily inserted with one touch.On the other hand, the inserted pipe is surely exerted withdrawal blocking force and is connected in an extremely stable state, and water leakage is prevented. There is no need to worry about providing a pipe joint.

[0011]

In order to achieve the above object, the invention according to claim 1 constitutes a joint main body with a tubular joint member and a lid member, and a seal ring and an insertion pipe are provided in the joint main body. This is a pipe joint in which a lock ring for retaining is attached, and the lock ring is arranged so as to be rotatable together with the insertion pipe.

The invention according to claim 2 is a pipe joint in which the ring portion of the lock ring is inclined 3 to 7 degrees with respect to the direction orthogonal to the central axis of the joint body, and the invention according to claim 3 is the lock ring. This is a pipe joint in which a retaining claw is formed to project in an inclined shape on the inner circumference of the ring portion, and a separation portion is provided between the ring portion of the lock ring and a mounting portion in the joint body.

According to a fourth aspect of the present invention, a joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body.
The ring portion of the lock ring is inclined 3 to 7 degrees with respect to the direction orthogonal to the central axis of the joint body, and the holding claws formed in the inner circumference of the ring portion to be inclined are further inclined with respect to the ring portion. Is a pipe joint in which insertion of the pipe is easy and a pullout preventing force of the pipe is obtained.

According to a fifth aspect of the present invention, a joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body.
The amount of the bite of the holding claw formed to project obliquely on the inner circumference of the ring portion of the lock ring is set to the pipe thickness cross-sectional area of 35
It is a pipe joint which is -50%.

According to a sixth aspect of the present invention, a joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body.
This is a pipe joint in which a retaining claw that is formed so as to project in an inclined shape is provided on the inner circumference of the ring portion of the lock ring so that the entire retaining claw does not bite into the pipe even when the retaining claw stands up.

According to a seventh aspect of the present invention, a joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body.
A pipe joint having a lock ring configured such that the holding claw side portions are in contact with each other in the standing process of the holding claw protrudingly formed on the inner circumference of the ring portion of the lock ring, and the inclination angle of the holding claw is held, The invention according to claim 8 is a pipe joint in which a pipe biting portion is formed on both sides of a holding claw.

According to a ninth aspect of the present invention, a lock ring and a seal ring for preventing a pipe from coming off are mounted in a joint body composed of a tubular joint member and a lid member, and an angle for regulating the deformation angle of the lock ring is set. This is a pipe joint in which the restriction portion is provided integrally or separately in the joint body.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment for connecting a resin pipe to a pipe joint according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing an example of a pipe joint according to the present invention, FIG. 2 is an exploded perspective view of the same, and FIG. 3 is a partial sectional view showing a state in which a resin pipe is connected to the pipe joint. is there. In the figure, 10 is a joint body made of metal such as brass or bronze, and the joint body 10 in this example includes a male screw 11a of a tubular joint member 11 and a female of a tubular lid member (nut or cap) 12. The screw 12a is screwed together, and the end of the joint member 11 is provided with a male screw portion 11b (or female screw or other connecting portion) for connecting with a header, a connecting member or a pipe (not shown). ing. The lid member 12 is not limited to the cap structure described above and may be a bush having an external thread. In this case, the bush is screwed into the joint member to form the joint body. A confirmation window 27 is formed on the outer peripheral surface of the lid member 12.

The resin pipe 13 for connecting to the joint body 10 is a pipe formed of a resin material such as cross-linked polyethylene or polybutene. When connecting the pipe 13 to the joint body 10, the tip of the resin pipe 13 is connected. Insert the core ring 14 made of metal such as bronze into the insertion part,
The biting amount of the lock rings 15 and 16 and the sealability of the seal ring 17 or 18 which will be described later are maintained. A flange 14a is formed at the tip of the core ring 14, and a tapered surface 14b is formed to protect the end of the resin pipe 13 and to allow the pipe 13 to be inserted into the joint body 1 smoothly. There is. The pipe 13 may be made of copper instead of resin.

2, in the lock rings 15 and 16 formed of stainless steel or the like, the ring portion 19 is inclined at 3 to 5 degrees with respect to the direction orthogonal to the central axis of the joint body. As shown in FIG. 7, it is bent and formed so as to incline toward the annular spacer 26 side by about 5 degrees. By inclining the ring portion 19, the ring portion 19
Since the contact area with the parts such as the joint body 10 that comes into contact with the contact ring is reduced and the frictional resistance is reduced, the lock ring 1
It becomes easy for 5 and 16 to rotate. Therefore, in the joint body 10 composed of the joint member 11 and the lid member 12, the insertion pipe 13 and the lock rings 15 and 16 are provided so as to rotate together.

When the inclination angle of the ring portion is smaller than 3 degrees, when the fluid pressure is applied to the pipe 13 connected to the joint body 10, a pulling force is applied to the pipe 13, and the lock ring 15 is pulled by the force. , 16 are pressed against the components such as the joint body 10 to increase the contact area with the components such as the joint body 10 and increase the frictional resistance, so that it is difficult to rotate the lock rings 15 and 16.
On the other hand, when the angle is greater than 7 degrees, the holding claw 20 described later is used.
The contact angle of the pipe with the pipe 13 becomes shallow, and when the pulling force is applied to the pipe 13, there is a possibility that the pipe 13 cannot be reliably held. If the holding claw 20 is lengthened in order to solve this, the depth of biting into the pipe 13 due to standing up may become deep, and the pipe 13 may be easily cut. Therefore, the inclination angle of the ring portion may be in the range of 3 to 7 degrees, but 5 to 7 degrees is more desirable as described above in order to ensure the rotatability of the lock rings 15 and 16.

As shown in FIG. 7, the holding claw 20 has a predetermined inclination angle on the inner circumference of the ring portion 19 more than the ring portion 19 (the initial bending angle of the lock ring in this example is 45 degrees).
It is provided so as to form a protrusion so as to facilitate the insertion of the pipe, and to obtain a pull-out preventing force of the pipe. When the pipe is pulled out, the holding claw 20 bites into the outer peripheral surface of the pipe 13 I'm trying to regulate the retention of. As shown in FIG. 5, each holding claw 20 has a slit 20a and a recess 20b formed at the center thereof.
By forming b, even if the holding claw 20 stands up, the entire holding claw 20 does not bite into the pipe. Further, by forming the concave portion 20b, the pipe biting portion 20c is formed at two locations along both sides of the holding claw 20. As described above, the lock rings 15 and 16 in this example do not have a portion for limiting the bite into the pipe 13 due to the shape of the lock rings.

The biting portions 20c may be provided at three or more locations on the tip of each holding claw 20, and when the biting portions 20c are provided at a plurality of locations as described above, the biting portions 20c are formed thinly. The contact surface pressure between the holding claw 20 and the pipe 13 becomes high, and it is easy to bite into not only a relatively hard pipe such as a polyethylene pipe but also a relatively soft pipe 13 such as a polybutene pipe.
Further, since the points when the holding claw 20 holds the pipe 13 increase, the pipe 13 can be held reliably. If the tip of the biting portion 20c is formed into a rounded shape with a small radius, when the pipe 13 is inserted into the joint body 10, the pipe 1
3 There is no danger of damaging the outer circumference.

When the pipe 13 is inserted, the holding claws 20 are expanded by the slits 20a as the pipe 13 is inserted, and the inclination angle thereof becomes large. Together with the inclination of the ring portion 19 and the spacing portion 24 described later, the lock ring for the pipe is inserted. Of the pipe 13 to the joint body 10
Can be smoothly inserted. On the other hand, when the pulling force is applied to the pipe 13 after the pipe is inserted, the holding claws 20 are slightly spread out at the time of molding the lock ring as will be described later. In the process of becoming shallow, the side portions 20d of the adjacent holding claws 20 come into contact with each other. Even if the holding claw 20 tries to stand up further due to the pulling-out force of the pipe 13, the holding claws 20 regulate each other by narrowing the slit 20a between the holding claws 20 and the standing up is suppressed. Therefore, the holding claw 20
The two bites 20c and 20c are substantially integrated with each other without causing a sharp decrease in the contact angle with the pipe 13,
Can hold a pipe. Thus, in the process of standing up each holding claw 20, the side portion 20d of each holding claw 20 is formed.
Are contacted with each other and the inclination angle of the holding claw 20 is held to obtain a pipe joint having a sufficient pipe holding force. The side portion 20d of the holding claw 20 and the biting portion 20
Since the side portion 20d can be secured long by sharing the side portion of c, the side portion 20d and the biting portion 20c can be accurately formed at the time of molding the lock ring.

More preferably, the side portions 20d are arranged such that, when pulling force is applied to the pipe 13, the holding claws 20 are erected so that the holding claws 20 contact each other after the pipe biting part 20c bites into the pipe 13. As shown in FIG. 5, it is preferable to form the holding claw 20 from the tip of the pipe biting portion 20c toward a ring portion 19 from a position slightly away from the ring portion. Further, by forming the biting parts 20c on both sides of the holding claw 20, the side parts 20d of the holding claw 20 are formed.
In this case, since the area becomes large, the ratio of the holding claws becomes large at the time of drawing and bending, and as a result, the slit 20
It is possible to make a smaller.

In FIG. 5, when the holding claws 20 of the lock rings 15 and 16 are erected in the same horizontal direction as the ring portion 19, the amount of bite of the holding claw 20 in the pipe is 35 to 35 of the wall thickness sectional area of the pipe 13. It is set to 50%, which makes it difficult for the pipe 13 to break even when an excessive pipe drawing force is applied.

Here, the case of molding the lock ring will be described. FIG. 8A shows a state in which the lock ring is processed and formed into a flat shape. Further, in FIG. 8B, the holding claw is bent by bending. The solid line portion shows the shape when the holding claw is bent by drawing bending, and the holding claw is slightly expanded by the drawing bending, and the holding claw is inclined and formed at about 45 degrees. Specifically, the holding claw is stretched by applying a squeeze using a press machine, and has a shape that spreads in the circumferential direction, and accordingly, the slit width becomes slightly narrow. Therefore, when pulling force is applied to the pipe 13, the holding claw 2
Before 0 is completely erected, the slit width becomes zero as shown in FIG. 8C, and the holding claw side surfaces 20d come into contact with each other. Even if the holding claws 20 try to stand up further from this state, the holding claws 20 interfere with each other to prevent standing up, so that the bending angle is maintained and the pipe 13 can be prevented from coming off. The angle α at this time is preferably processed so as to be held at 10 to 20 degrees, and more preferably processed so as to be held at 12 to 20 degrees.

The broken line portion in FIG. 8 (b) shows the shape when the holding claw is simply bent by a normal bending process. In this case, the bending of the holding claw widens the slit width. When the pulling force is applied to the pipe to erect the holding claw, the slit width disappears when the holding claw is completely upright and the bending angle of the holding claw disappears.
Not desirable. 8 (a), 8 (b) and 8
In (c), BB line, CC line, and DD line, respectively.
A cross-sectional view taken along the line is shown on the left side.

By using the lock rings 15 and 16, the pipe 13 can be held regardless of whether it is a polyethylene pipe or a polybutene pipe. In general, polyethylene pipes are relatively hard and the metal lock ring claws easily bite, while polybutene pipes are relatively soft and elastic, and a claw with a low contact surface pressure with the pipe will escape from the outer surface of the pipe. Although it is a material that does not easily bite, the contact surface pressure of the claw against the pipe is reduced like the lock ring of the shape that has the arc-shaped protrusion with a large radius at the center of the tip of each claw shown in the prior art, and the polybutene There is no risk of insufficient bite into the pipe or disconnection of the pipe when pulling force is applied to the pipe.
Can be held securely. In this way, there is no need to newly provide a separate lock ring exclusively for polybutene pipes, and it is a lock ring that can be used for both polyethylene pipes and polybutene pipes, and the number of parts increases and the management man-hours increase and the cost increases. There is no. In addition, there is no fear that a lock ring for different types of pipes will be erroneously assembled when the pipe joint body is assembled.

The plurality of lock rings 15 and 16 (two in this example) are mounted on a mounting portion 22 in the joint body with a spacer ring 21 formed of metal or resin interposed between the ring portions 19. is doing. In this example, the thickness of the spacer ring 21 is preferably 0.7 to 1.5 mm, and when the thickness of the spacer ring 21 is 0.5 mm or less,
Each lock ring 15 and 16 behaves in substantially the same manner, and all the claws stand up at once, leading to breakage of the pipe, which is not desirable. In the embodiment described later, the spacer ring thickness 21 is 1.0 to
A favorable result was obtained at 1.5 mm.

The mounting portion 22 in the present embodiment is a transparent or transparent member having a stepped portion 12b provided on the inner peripheral side of the lid member 12 and a pressure resistance, cold heat resistance, hydrolysis resistance and chlorine resistance fitted to the lid member 12. Annular spacer 2 provided at the end of the semitransparent transparent tube 25
Between 6 and 6. At least the mounting surface 2 of the mounting portion 22
3 is provided between the ring portion 19 and the ring portion 19, and
In (a), the separation distance A between the lock ring 15 and the step portion 12b in the axial direction of the joint body of the mounting portion 22 is set to 0.1.
~ 0.8 mm. As a result, the lock ring 15
Can be inclined by the distance A, and the pipe can be inserted smoothly. Further, since there is the separation distance A, the lock rings 15 and 16 can rotate in the joint body.
Therefore, in the joint body 10 composed of the joint member 11 and the lid member 12, the insertion pipe 13 and the lock ring 15,
It is provided so as to be co-rotatable with 16. If the separation distance A is larger than 0.8 mm, the outer peripheral side of the ring portion 19 inclines toward the joint member 11 when a pulling force is applied to the pipe 13, and the holding claw 20 with respect to the pipe 13 is inclined. Since the contact angle becomes shallow, it may not be possible to sufficiently hold the pipe.

It is also possible to prevent the co-rotation of the pipe 13 by inclining only the ring portion 19 of the lock ring without providing the separating portion 24. In this case, the ring portion 19 is inclined at an appropriate angle. The contact area with the parts such as the joint body 10 that comes into contact with the ring portion is reduced, and the friction resistance is reduced, so that the lock ring is easily rotated.

The angle regulating portion 28 is provided integrally with or separately from the joint body 10 and regulates the deformation angle of the lock ring 15. In this example, in FIG. 4, the angle restricting portion 28 integrally provided on the lid member 12 is integrally provided. The angle restricting portion 28 may be provided in the joint body 10 integrally or separately, and is not limited to the above example. When the pulling force acts on the pipe 13, the inclination angle of the angle regulation unit 28 is
Since the deformation amount of the lock ring 15 mounted on the pipe insertion port side is less than the deformation amount of the lock ring 16 on the far side, these two lock rings are prevented from contacting each other. The inclination angle of the holding claw 20 is set to be equal to or smaller than that. In this example, with respect to the initial bending angle of 45 degrees of the holding claw 20 of the lock ring 15, the angle restricting portion 28 is in an angle range of more than 0 degree and 40 degrees or less, corresponding to the nominal diameter of the joint or the like. Is set. Further, the angle restricting portion 28 can hold the pipe by the lock ring without breaking the pipe by decreasing the angle as the nominal diameter of the joint increases.

Although the see-through tube 25 is arranged between the outer peripheral surface of the pipe 13 and the inner peripheral surface of the joint body 10, the joint body 1
The end portion of the female screw 12a of the lid member 12 forming 0 and the male screw base portion of the joint body 10 are brought into contact with each other to prevent the lid member 12 from being screwed in more than necessary.
The tightening force due to is not applied. Lid member 12
A step portion 12c is provided on the base plate, and the annular spacer 26 is locked to the step portion 12c to securely secure the lock ring mounting portion.

Next, the operation of the above embodiment will be described. 2 and 3, the engaging surface 11 of the joint member 11
When the seal ring 18 is attached to the corner portion of c and the transparent tube 25 is inserted into the joint member 11, the engaging portion 25a of the transparent tube 25 is formed.
Is engaged with the engagement surface 11c of the joint member 11, and the seal ring 18 is attached to the attachment step 25b to hermetically seal the see-through cylinder 25 and the joint member 11 in the liquid contact portion. Next, the seal ring 17 is attached to the attachment portion 25c formed at the rear end of the see-through tube 25.

On the other hand, two lock rings 15 and 16 are mounted on the mounting portion 22 of the lid member 12 via a spacer ring 21, and an annular spacer is further provided between the lock ring 16 and the seal ring 17. 26, and the lid member 12
The internal thread 12a is screwed onto the external thread 11a of the joint member 11 to form the joint body 10.

When the resin pipe 13 is connected to the joint body 10, the core ring 14 is fitted from the tip of the pipe 13, and the collar portion 14a of the core ring 14 has the pipe 1
It fits in the state located in the end surface of 3. This resin pipe 1
3 is inserted from the pipe insertion port 29 of the lid member 12, the lock ring 15 is inserted in the initial state shown in FIG.
Is arranged in a state of being separated from the step portion 12b by a distance A, and the ring portion 19 is inclined at an angle of about 5 degrees, and the holding claw 20 of the lock ring 15 is arranged with respect to the ring portion 19. Since it has an angle of about 45 degrees,
The holding claws 20 contact the outer circumference of the pipe at an angle of about 50 degrees in total. This structure is the same for the lock ring 16. Next, as shown in FIG. 7B, the lock ring 15 is further inclined within the range of the distance A. In the same figure (c), the pipe is easily inserted while the lock ring 16 is also tilted. Since the lock rings 15 and 16 are easily inserted in this way and have the same angle, the pipes can be easily inserted without the lock rings 15 and 16 overlapping each other. In this case, the lock rings 15 and 16 are rotatable in the circumferential direction and are provided so as to follow the twist of the pipe and the like.

Since the seating surfaces of the ring portions 19 of the lock rings 15 and 16 have an inclination angle of 3 to 7 degrees, the contact area is small, and the pipe 13 and the lock rings 15 and 16 are easily rotated together. The pipe 13 can be firmly held. Further, even when there is no separation distance A, in the ring portion 19, the contact portion between the step portion 12b and the spacer ring 21 is reduced, the lock rings 15 and 16 can rotate, and can follow the twist of the pipe. Further, by providing the separation distance A as described above, the lock ring 15 can be rotated more easily, and the inclination degree can be increased to facilitate the pipe insertion.

Next, as shown in FIG. 3, when the pipe 13 is inserted until it abuts on the pipe abutment surface 25d provided on the inner peripheral surface of the see-through cylinder 25, the lock rings 15 and 16 bite into the outer peripheral surface of the pipe 13. While being prevented from coming off, the outer peripheral surface of the pipe 13 and the inner peripheral surface of the see-through tube 25 are reliably hermetically sealed by the seal ring 17. At this time, the holding claws 20 of the lock rings 15 and 16 have the concave portion 2 at the center thereof.
Since 0b is deeply formed, the biting parts 20 at both ends are
Cut into the pipe 13 from c.

In the pipe joint using the lock ring, the area where the biting portion bites into the pipe gradually increases as the holding claw rises due to the pulling force applied to the pipe, but in this example, the biting portion 20c is thickened. By forming a plate shape with a constant thickness and a trapezoidal shape with a shallow angle, it is possible to suppress the amount of increase in bite, and to maintain a state in which the contact surface pressure between the holding claw 20 and the pipe 13 is high. Can be facilitated. Therefore, the biting area is rapidly increased and the holding claw 20 rises and the pipe 13
It is possible to suppress a phenomenon in which the contact surface pressure with and to make it difficult to bite.

In this example, the pipe insertion port 29 of the lid member 12 is not provided with a seal member for hermetically sealing the gap between the lid member 12 and the outer periphery of the pipe 13, that is, the pipe 1
When 3 is inserted into the joint body 10, first the lock ring 15
It is a structure that comes into contact with. Therefore, the operator who inserts the pipe can confirm whether or not the pipe 13 is inserted until it reaches the lock ring 15 with this feeling of contact, and there is no erroneous recognition as compared with the joint having a structure that first comes into contact with the seal member when the pipe is inserted. A reliable pipe insertion can be performed.

Resin pipe 13 inserted in the joint body 10
Can be visually observed from the outside through a transparent or translucent transparent tube 25 through a confirmation window 27 formed on the outer peripheral surface of the lid member 12 of the joint body 10. After the confirmation of the attachment of the resin pipe 13 to the joint body 10 through the confirmation window 27, when a fluid such as cold water or hot water is caused to flow through the pipe 13, the fluid becomes a gap between the transparent tube 25 and the outer circumference of the pipe 13, and the transparent tube 25. Although they enter the gaps of the joint member 11, they are sealed by the seal rings 17 and 18, so that the fluid does not leak from the confirmation window 27 provided in the lid member 12 to the outside of the pipe joint.

As shown in FIG. 4A, when a pulling force acts on the pipe 13 in the arrow direction, the lock rings 15 and 16 are
The ring portion 19 is pulled vertically toward the step portion 12b, the distance A in FIG. 6 is zero, and the holding claw 20 is about 4 mm.
It contacts the outer circumference of the pipe at an angle of 5 degrees. Then, FIG. 4 (b)
At this time, the holding claws 20 of the lock rings 15 and 16 for preventing the pipe 13 from coming off and gradually standing up, and eventually,
Even when the holding claw 20 of the lock ring 15 is most erected, the amount of biting of the holding claw 20 into the pipe 13 is 35 to 50% of the wall thickness cross-sectional area of the pipe 13, and the pipe 13 is Since the thickness is ensured to be more than half, there is no fear that the pipe 13 will be broken unexpectedly. At this time,
The concave portion 20b of the holding claw 20 is deeply formed so as not to bite into the pipe 13 at all, and the holding claw 20 is entirely formed in the pipe 13.
I'm trying not to get into the
The initial wall thickness can be partially ensured, and the breakage of the pipe 13 can be further suppressed.

In the process of raising the holding claws 20, the holding claws 2 are provided by using the lock rings 15 and 16 which contact the side portions 20d of the respective holding claws 20 and regulate the standing of each other.
The inclination angle can be held in a state in which the standing of the whole 0 is suppressed, the holding claw 20 can be prevented from standing further, and the holding force of the pipe 13 can be maintained, and the pipe is reliably prevented from breaking. be able to. Furthermore, the pipe biting part 2
Since 0c is formed on both sides of the holding claw 20, it is possible to immediately follow the narrowing of the slit 20a and suppress the standing of the holding claw 20 from the initial stage of the standing claw 20. Can be prevented. Also, the side portion 20d
The area of can be taken large, and by drawing and bending,
This area can be increased to make the slit 20a narrower, and the side portion 20d when the holding claw 20 stands up.
Can be surely contacted from the beginning.

As in the present embodiment, each holding claw 20
By narrowing the pipe biting portion 20c along the side portion 20d, the biting into the pipe 13 is ensured and the slit 20a is formed by the contact of the holding claw 20.
The pipe biting portions 20c adjacent to each other via the can hold the pipe 13 integrally, and a sufficient pipe holding force can be secured. Further, since the holding claw 20 of the lock ring abuts on the angle restricting portion 28 provided integrally with or inside the joint body 10, the holding claw 2 for the pipe 13 is provided.
The bite prevention force of 0 can be enhanced and the pipe 13 can be reliably prevented from breaking.

Since the lock rings 15 and 16 can rotate together with the pipe 13, as shown in FIG.
Under normal conditions, it does not hinder the lock ring,
In the conventional structure, as shown in FIG. 11 (b), when the pipe is bent, the lock ring undergoes partial deformation, and the force applied to the lock ring varies depending on the position. However, according to this example, since the angle regulating portion 28 is provided,
As shown in FIG. 11 (c), the lock rings 15 and 16 do not locally change, and it is possible to reliably prevent the lock rings from coming off.

Since the lock ring 15 on the front side reliably receives a part of the pull-out force of the pipe 13, the force applied to the lock ring 16 at the back can be reduced, the deformation amount of the holding claw 20 can be suppressed, and the pipe 13 can be suppressed. The bite angle to the pipe 13 is shallow, the spring force is maintained, and the force for gripping the pipe 13 becomes large.
Further, since the movement amount of the pipe 13 is also suppressed, there is no influence on the sealing property with the seal ring 17 and the like.

[0049]

EXAMPLES An example of the implementation of the pipe joint of the present invention will be specifically described. The joint size in this example is 13A, and the initial bending angle of the holding claw of the lock ring is 45 degrees.

The graph shown in FIG. 9 is an example showing the relationship between the stroke of the pipe and the tensile force in the crosslinked polyethylene pipe (PEX pipe), and the graph shown in FIG. 10 is the polybutene pipe (PB pipe). 2) is an example showing the relationship between the stroke of the pipe in FIG. In both figures,
The solid line shows that the pipe stretched and no pipe rupture occurred at the lock ring biting part when the pipe pulling force was applied, which is indicated by a double circle. The broken line indicates that the pipe stretched when the pipe was pulled out, but the pipe broke at the lock ring biting portion, and this is indicated by a circle. The chain line indicates that the pipe did not stretch when the pipe was pulled out, but it had a strength to reach the yield point of the pipe material, and the pipe broke at the lock ring biting part,
This is indicated by a triangle. In the table, the mark X indicates that the pipe broke at the lock ring bite portion without reaching the yield point of the pipe material.

[0051]

[Table 1]

Table 1 shows that the joint size is 13 A (pipe 13
The cross-sectional area of A is about 98 square millimeters), and the initial bending angle of the holding claw of the lock ring is 45 degrees. In this example, there is no angle restriction part, and the material of the pipe is a crosslinked polyethylene pipe and the result is a polybutene pipe. According to the result of this experiment, the holding claw 2 to the pipe 13
When the bite amount of 0 is less than 30%, the gripping force of the pipe 13 is reduced and the pipe comes out of the lock ring.
On the other hand, the amount of the holding claw 20 biting into the pipe 13 is 55%
Above that, the pipe will break without stretching.
Therefore, when the holding claws 20 of the lock rings 15 and 16 are erected in the same horizontal direction as the ring portion 19, the amount of bite of the holding claws 20 in the pipe is 35 to 35 of the thickness cross-sectional area of the pipe 13.
50% is preferable and 40 to 50% is most preferable.

[0053]

[Table 2]

Table 2 shows that the joint size is 13 A, and the angle regulating value of the angle regulating portion 28 is divided into seven types from 0 degree to 30 degree, and the test is performed, and the thickness of the spacer ring 21 is 0.5 mm. 0mm, 1.2mm, 1.5mm 4
I went into different types. As a result, as is clear from the table, the angle regulating portion 28 with respect to the thickness of the spacer ring 21 is
Is 1 when the spacer thickness is 1.0 to 1.5 mm.
Good tensile performance of the pipe 13 could be obtained when the pipe 13 was provided at an angle of 0 to 15 degrees. Also, joint size 16A,
In the test of 20A or the like, good results were obtained even when the angle regulation value was set to 5 to 10 degrees, so that the regulation value of the angle regulation section 28 was larger than 0 degree, and it was mounted on the pipe insertion port 29 side. If the initial refraction angle of the holding claw 20 of the lock ring 15 is smaller, the effect will be more exerted.

[0055]

[Table 3]

Table 3 shows that the separation distance A is 0.2 to 1.2 when the joint size is 13 A and the angle regulation value is 30 degrees.
The tensile performance and the insertability of the pipe were tested by changing the above.
The tensile performance is preferably 0.2 to 0.6 mm, and the insertability is good except for 0.2 mm. Overall, it is considered that 0.4 to 0.6 is preferable. In addition, the insertability in Table 3 shows that the pipe could not be inserted into the joint.
The double circle indicates that the pipe could be inserted without applying excessive force.

[0057]

As is apparent from the above, according to the invention of claim 1, the seal ring and the lock ring for preventing the insertion pipe from coming off are mounted in the joint body, and the lock ring is used together with the insertion pipe. Since it is installed so that it can rotate, it can follow the twist of the insertion pipe reliably, and the inserted pipe is surely exerted withdrawal blocking force, connected securely in an extremely stable state, and there is no risk of water leakage. No pipe fitting can be obtained.

According to the second aspect of the present invention, the lock ring and the insertion pipe can be easily rotated together to further prevent the twisting of the pipe, and the pipe can be securely held even if the holding claw is not provided. There is no danger of disconnecting.

According to the third aspect of the present invention, the lock ring is provided with the holding claw protrudingly formed on the inner circumference of the ring part, and the separating part is provided between the mounting surface of the joint body facing the ring part and the ring part. Therefore, the lock ring can be rotated to reliably follow the twist of the insertion pipe, and the pipe can be easily inserted into the pipe joint, while the inserted pipe is reliably prevented from being pulled out. , A stable connection state is maintained.

According to the invention of claim 4, the pipe can be easily inserted into the pipe joint, and at the time of pulling out the pipe, the entire lock ring stands up by the inclination angle of the seat surface and the holding claw of the lock ring bends. Since the pipe is held by the corner, the pipe can be securely held without breaking.

According to the invention of claim 5, when the holding claw of the lock ring is erected in the same horizontal direction as the ring portion, the amount of bite of the holding claw by the pipe is 35 of the pipe thickness cross-sectional area.
Since it is configured to be 50% or more, since the wall thickness of the pipe is secured to be more than half, the breakage of the pipe at the biting portion of the lock ring is reliably prevented, while the pulling-out preventing force of the pipe is improved.

According to the invention of claim 6, it is possible to surely prevent breakage of the pipe, and further, by forming the recessed portion into a rounded shape, bite into the pipe little by little to prevent excessive bite. There is nothing to do.

According to the invention of claim 7, when the pulling force is applied, the pulling force can be exerted while maintaining the holding force of the pipe to prevent the pipe from breaking.
According to the invention of claim 8, the pipe joint is capable of suppressing the standing of the holding claws and maintaining the holding force from the initial stage when the pulling force to the pipe is generated.

According to the ninth aspect of the present invention, even if an excessive tensile force is applied to the pipe, the pipe is reliably prevented from breaking, and the lock ring on the back side keeps a shallow biting angle to the pipe. The gripping force of is increased.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a pipe joint according to the present invention.

FIG. 2 is an exploded perspective view showing the pipe joint of FIG. 1 separately.

FIG. 3 is a partial cross-sectional view showing the pipe joint of FIG.

4 (a) and 4 (b) are explanatory views showing a pull-out force of a pipe and a deformation amount of a lock ring in the present invention.

FIG. 5 is a partial explanatory view showing the amount of bite into the pipe when the holding claws of the lock ring of the present invention are completely erected.

6 (a), (b) and (c) are explanatory views showing a pipe inserting step of the pipe joint of the present invention.

FIG. 7 is a partially enlarged view of FIG. 6 (a).

8A, 8B, and 8C are explanatory views of the state of the lock ring. (A) is a state in which the lock ring is processed and formed into a flat shape. (B) is a state in which the holding claw is bent by bending. (C) is a state in which the slit width is zero.

FIG. 9 is a graph showing a comparative example of tensile test data of pipes in a pipe joint of a cross-linked polyethylene pipe (PEX pipe).

FIG. 10 is a graph showing a comparative example of tensile test data of pipes in a polybutene pipe (PB pipe) pipe joint.

11 (a), (b) and (c) are explanatory views for explaining a relationship between a pipe and a lock ring.

12 (a), (b), and (c) are explanatory views showing a pull-out force of a pipe and a deformation amount of a lock ring in a conventional example.

13 (a) and 13 (b) are explanatory views showing a pipe insertion state of a pipe joint in a conventional example.

[Explanation of symbols]

10 Joint body 11 Joint members 12 Lid member 13 pipes 15,16 Lock ring 17,18 Seal ring 19 Ring part 20 holding claws 20b recess 20c bite part 21 Spacer ring 22 Mounting part 23 Mounting surface 24 Spacer 28 Angle restriction unit

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshio Hashioka             2040 Nagasaka-Kamijo, Nagasaka-machi, Kitakoma-gun, Yamanashi Prefecture             Kitz Nagasaka factory F-term (reference) 3H015 FA06 JA02                 3J106 AA06 AB01 BD01 EA03 ED13                       EE01

Claims (9)

[Claims] 1. A joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body, and the lock ring can rotate together with the insertion pipe. A pipe joint characterized by being placed in. 2. The pipe joint according to claim 1, wherein the ring portion of the lock ring is inclined 3 to 7 degrees with respect to the direction orthogonal to the central axis of the joint body. 3. A holding claw protrudingly formed on the inner circumference of the ring portion of the lock ring, and a separating portion is provided between the ring portion of the lock ring and a mounting portion in the joint body. The pipe fitting described in. 4. A joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body, and the ring portion of the lock ring is attached to the joint body. The pipe can be easily inserted by inclining it by 3 to 7 degrees with respect to the direction orthogonal to the central axis, and further by inclining the retaining claws protrudingly formed on the inner periphery of the ring portion with respect to the ring portion, A pipe joint characterized in that a pull-out preventing force is obtained. 5. A joint main body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint main body, and an inclined shape is formed on the inner circumference of the ring portion of the lock ring. A pipe joint characterized in that the amount of bite of the holding claw protrudingly formed into the pipe is 35% to 50% of the pipe wall thickness cross-sectional area. 6. A joint body is composed of a tubular joint member and a lid member, a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body, and an inclined shape is formed on the inner circumference of the ring portion of the lock ring. A pipe joint characterized in that a concave portion is provided on a holding claw that is formed so as to project so that the entire holding claw does not bite into the pipe even when the holding claw stands up. 7. A joint body is composed of a tubular joint member and a lid member, and a seal ring and a lock ring for preventing the insertion pipe from coming off are mounted in the joint body, and a protrusion is formed on the inner circumference of the ring portion of the lock ring. A pipe joint, characterized in that it has a lock ring configured such that side portions of the holding claws come into contact with each other in the process of standing up the holding claws and hold the inclination angle of the holding claws. 8. The pipe joint according to claim 7, wherein pipe holding portions are formed on both sides of the holding claw. 9. A joint main body composed of a tubular joint member and a lid member, in which a lock ring and a seal ring for retaining a pipe are mounted, and an angle regulating portion for regulating a deformation angle of the lock ring is provided in the joint main body. A pipe joint, characterized in that it is provided inside or separately.