JP2008025819A - Joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint of one touch operation type capable of simply connecting a composite pipe without using such a special compressive fixture as a caulking type joint, while preventing a metal of the metal joint main body and a metal surface exposed on the end surface of the composite pipe from contacting each other when connecting the composite pipe. <P>SOLUTION: A cap nut 7 in which a fastening split ring 11 provided with claws 12 is fitted in advance is connected to the joint main body 1 having an outer cylinder part 5 which constitutes an annular groove 4 with this inner cylinder part 3 and the inner cylindrical part 3 in which an O ring 17 is fixed, and the composite pipe 6 having at least three layers structure in which a metal layer 6b composed of such metal materials as aluminum between synthetic resin layers 6a, 6a, is held tight and through a guide ring 15 passed through the inner cylinder part 3, is inserted into the annular groove 4 from the hexagon cap nut 7 side so that the claws 12 are eaten into the outer peripheral surface j of the composite pipe end part E and as a result, the one touch operation type metal made joint 24 is comprised to prevent the composite pipe 6 from coming-off. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a joint for connecting a resin pipe made of a synthetic resin material, and a joint for connecting a composite pipe having at least a three-layer structure in which a metal layer made of a metal material such as aluminum is sandwiched between synthetic resin layers. It is.

  At the time of plumbing for water supply and hot water supply, draw the water supply main pipe and the hot water supply main pipe from the hot water supply equipment indoors, connect the water supply main pipe and the hot water supply main pipe to the water supply pipe header and the water supply pipe header, As water supply pipes and hot water supply pipes connecting each of these headers to, for example, each stopcock located upstream of the hot water mixing tap in the bathroom, it is resistant to heat, such as crosslinked polyethylene or polybutene, and is not easily deformed and rusts. It is used by inserting a resin pipe with excellent durability such as no piercing through a bellows-like sheath tube, so that in the case of water leakage etc., the sheath tube is left as it is and both ends of the resin pipe are used. There is convenience in that the resin pipe can be taken out from the inside of the sheath tube and replaced by simply releasing the connection.

  A joint to which a resin pipe made of a synthetic resin material such as cross-linked polyethylene or polybutene is connected includes a cap nut in which a split ring provided with a claw is previously fitted, an inner cylinder portion to which an O-ring is attached, and an inner cylinder portion thereof. Resin by connecting to the joint body having an outer cylinder part that forms an annular groove with the cylinder part, and inserting the resin pipe into the annular groove from the cap nut side to bite the claw into the outer peripheral surface of the end part of the resin pipe This is a one-touch type metal joint that enables the pipe to be prevented from coming off.

  On the other hand, in addition to the joint to which the resin pipe is connected, a metal joint to which a composite pipe is connected is proposed in Patent Document 1 below. The composite pipe is made of a synthetic resin material such as crosslinked polyethylene or heat-resistant polyethylene and a metal material such as aluminum, and has, for example, a three-layer structure in which an aluminum metal layer is sandwiched between synthetic resin layers. And, in the metal joint described in the above-mentioned Patent Document 1, there is a special possibility that it may occur by connecting composite pipes that could not occur when using the above-mentioned resin pipe made of crosslinked polyethylene or polybutene. The problem is solved.

  That is, the metal joint described in Patent Document 1 is provided with a cylinder portion on which the composite pipe can be fitted on the joint body, and for fitting the composite pipe between the cylinder portion outside the cylinder portion. A metal thin core is provided so as to form an annular groove, an insulating sheet covering the bottom is provided at least at the bottom of the annular groove, and an end surface of the composite pipe fitted into the annular groove is in contact with the insulating sheet, It is configured so that the metal of the joint body and the metal layer exposed at the end face of the composite pipe do not come into contact with each other, and the metal of the joint body and the metal layer of the composite pipe are in contact, and For example, when water due to leakage exists between these metals, the metal with the higher equilibrium electrode potential is oxidized and corroded between the metal of the joint body and the metal layer of the composite pipe, and the metal layer travels through the metal layer. Current flows to the side Although there is a risk of falling into such a dangerous state, there is no metal-to-metal contact due to the insulating sheet, so that corrosion of the metal of the joint body and the metal layer of the composite pipe can be prevented, and the situation of falling into the dangerous state is avoided. It is something that can be done.

  JP 2004-125016 A

  However, in the joint to which the former resin pipe is connected, since the resin pipe is directly inserted (inserted) into the annular groove, the resin pipe hits the O-ring during insertion and the O-ring is crushed by the resin pipe. In addition, there is a risk that the rough end face of the resin pipe that has been cut may damage the O-ring or, in the worst case, the O-ring may be cut, and the resin pipe cannot be inserted at the end face by the split ring provided with the claws. There is a problem that it becomes difficult to insert the resin pipe into the annular groove.

  Moreover, since the joint described in the latter patent document 1 is a so-called caulking joint configured to compress and deform the outer surface of the thin core and connect the composite pipe to the joint body, A compression jig is required.

  A first object of the present invention is to provide a one-touch type joint that can prevent a situation in which, when a resin pipe is used, an O-ring is damaged when the resin pipe is inserted or it becomes difficult to insert. The second object of the present invention is to provide a caulking type joint while avoiding a situation in which the metal of the joint body and the metal layer exposed on the end face of the composite pipe come into contact with each other even when the composite pipe is connected. It is another object of the present invention to provide a one-touch type joint that can easily connect a composite pipe without using a dedicated compression jig.

  In order to achieve the first object, a joint according to the present invention includes a cap nut in which a split ring provided with a claw is fitted in advance with an inner cylinder part to which an O-ring is attached and the inner cylinder part. Connected to the joint body having an outer cylinder part forming an annular groove, a resin pipe made of a synthetic resin material such as cross-linked polyethylene or polybutene is inserted into the annular groove from the bag nut side, and the claw is placed on the outer periphery of the resin pipe end part. It is a one-touch type metal joint that enables the resin pipe to be prevented from coming off by biting into the surface, and the resin pipe is configured to be inserted into the annular groove via a guide ring inserted into the inner cylinder portion. Furthermore, the guide ring is formed in a curved surface or a tapered surface that is divergent so that the guide ring can pass through the split ring without damaging the O-ring. Are, moreover, the guide ring is characterized by having a pipe insertion annular groove the resin pipe end portion is formed to be inserted (claim 1).

  In order to achieve the second object, a joint according to the present invention includes a cap nut in which a split ring provided with a claw is inserted in advance, an inner cylinder portion to which an O-ring is attached, and the inner cylinder portion. A composite pipe having at least a three-layer structure in which a metal layer made of a metal material such as aluminum is sandwiched between synthetic resin layers is connected to the joint body having an outer cylindrical portion that forms an annular groove. A one-touch type metal joint that allows the composite pipe to be prevented from coming off by inserting the claw into the outer peripheral surface of the end of the composite pipe by inserting it into the annular groove from the cap nut side through the inserted guide ring. The guide ring has an annular pipe insertion groove formed so that the end of the composite pipe is inserted, and is provided in advance in the pipe insertion groove so that the end face of the composite pipe abuts. Pipe end surface is characterized by having an annular insulating packing which can prevent the direct contact with the guide ring (claim 2).

  In another aspect of the present invention, a composite pipe having at least a three-layer structure in which a metal layer made of a metal material such as aluminum is sandwiched between synthetic resin layers made of a synthetic resin material such as crosslinked polyethylene or heat-resistant polyethylene is connected. A one-touch type metal joint having a connecting portion at one end and an inner cylindrical portion extending from one end side toward the other end side inside the connecting portion, while the other from the connecting portion A joint body having an outer cylinder portion that extends shorter than the inner cylinder portion toward the end side and forms an annular groove with the inner cylinder portion, and has an external thread on the outer peripheral surface of the outer cylinder portion, and a downstream side In this order, a bag screw having a female screw portion formed with a female screw that is screwed into the male screw of the outer cylinder portion, an annular surface having an inner diameter shorter than the inner diameter of the female screw portion, and a pipe insertion hole portion with which the outer periphery of the composite pipe abuts. A split ring with a claw that is fitted in the cap nut in advance from the side of the female thread portion of the cap nut and disposed on the annular surface, and is inserted through the inner cylinder portion in advance, and is pushed into the composite pipe. And a guide ring that is inserted into the annular groove together with the composite pipe, and the inner cylinder portion has a plurality of upper and lower O-rings on the outer peripheral surface facing the composite pipe insertion hole portion and / or the annular surface. When the cap nut is connected to the joint body, an annular space for pipe insertion communicating with the annular groove is formed between the annular surface of the cap nut and the pipe insertion hole portion and the inner cylinder portion. In this state, when the composite pipe is inserted from the annular space into the annular groove of the joint body through the guide ring, the claw of the split ring bites into the outer peripheral surface of the composite pipe end. Further, the guide ring has an annular pipe insertion groove formed so that the end of the composite pipe is inserted therein, and is previously provided in the pipe insertion groove so that the end face of the composite pipe abuts. A joint having an annular insulating packing that is provided and can prevent the end face of the composite pipe from directly contacting the guide ring is provided.

  In this invention, a resin pipe made of a synthetic resin material such as cross-linked polyethylene or polybutene is configured to be inserted into an annular groove via a guide ring inserted through the inner cylinder portion, and the lower end surface of the guide ring is a curved surface, Or since it formed in the taper surface of the divergent shape, the situation where it becomes difficult to insert by the split ring provided with the nail | claw or the nail | claw provided when inserting the resin pipe can be prevented. That is, the end of the resin pipe is inserted into the pipe insertion groove formed in the guide ring, and the resin pipe advances to the insertion side with the guide ring attached, but the lower end surface of the guide ring is the O-ring in the middle The guide ring advances in a state where the O-ring is retracted while hitting and the diameter of the split ring is increased while the lower end surface of the guide ring hits the claw.

  Moreover, in this invention, the bag by which the split ring provided with the nail | claw was beforehand inserted by the joint main body which has the inner cylinder part to which the O-ring was attached, and the outer cylinder part which forms an annular groove with this inner cylinder part. With the nut connected, it is an easy one-touch operation to insert the end of the composite pipe from the side of the cap nut through the guide ring inserted into the inner cylinder part to the back of the annular groove. A composite pipe can be connected without using a dedicated compression jig. Then, by inserting the composite pipe into the annular groove from the cap nut side, the composite pipe can be prevented from returning due to the retaining action that the claw bites into the outer peripheral surface of the end of the composite pipe.

Further, in the present invention, before inserting the composite pipe, an annular insulating packing is provided in advance in the pipe insertion groove of the guide ring, and the composite pipe end surface where the metal layer is exposed comes into contact with the insulating packing. Since the insertion work of the composite pipe is started with the end inserted in the pipe insertion groove, the metal of the joint body and the metal layer exposed on the end face of the composite pipe come into contact in the connected state when the insertion is completed Of course, the situation where the metal of the guide ring and the exposed metal layer contact can also be avoided.
That is, in this invention, since the composite pipe end surface is positioned in the pipe insertion groove of the guide ring via the insulating packing, the composite pipe end surface is not brought into contact with the joint body by the insulating packing and the guide ring. In addition to partitioning, the end face of the composite pipe is partitioned by insulating packing so as not to contact the guide ring. For this reason, in the present invention, when the leaked water enters the pipe insertion groove of the guide ring in the use state, the composite pipe end face is in contact with the insulating packing, so that the water that has entered the composite pipe end face and the guide ring There is never a situation that exists between the end face of the composite pipe and the joint body, and there is a large equilibrium electrode potential due to the presence of water, the metal layer of the composite pipe, the metal of the joint body, the guide It is possible to reliably prevent any of the ring metals from being oxidized and corroded, and to avoid a situation in which a dangerous state occurs, for example, current flows through the metal layer to the water heater side. it can.

  In addition to the one-touch type used in the present invention and the caulking type described in the conventional example, a connection type of the joint of the composite pipe is conceivable, but a screw type that tightens a cap nut is also conceivable. In the case of this joint, when it is constructed at a place where the joint needs to be removed periodically, the torque management of the cap nut is necessary after construction. However, since the joint according to the present invention is a one-touch type joint that can be connected by simply inserting the composite pipe into the annular groove of the joint body, torque management of the cap nut is not required, and workability is improved compared to the screw-in type. Can be good.

  Embodiments of the present invention will be described below with reference to the drawings. The present invention is not limited thereby.

1 to 5 show one embodiment of the present invention. FIG. 1A shows a guide ring including a composite pipe and an annular pipe insertion groove provided with an annular insulating packing against which the composite pipe end face abuts. FIG. 1B and FIG. Respectively show a plan view and a cross-sectional view of the insulating packing. 2-4 has shown the connection procedure of a composite pipe and a coupling. FIG. 5 is a sectional view of the split ring provided with the claws.
1 to 5, reference numeral 1 denotes a joint body made of metal (for example, made of a copper alloy not containing lead). The joint body 1 has a male screw portion 2 (an example of a connecting portion) at the downstream end, and an inner cylinder portion 3 extending from the downstream end side toward the upstream end side inside the male screw portion 2. The outer cylindrical portion 5 has an outer cylindrical portion 5 that extends from the male screw portion 2 toward the upstream end side and forms an annular groove 4 with the inner cylindrical portion 3. It has an external thread m. For example, an upstream connection portion of a water heater is connected to the male screw portion 2.
Reference numeral 6 denotes a composite pipe having a three-layer structure, for example, inserted into the annular groove 4. The composite pipe 6 is made of a synthetic resin material that is resistant to heat, such as crosslinked polyethylene or heat-resistant polyethylene, hardly deforms, and does not rust, and a metal material such as aluminum. In this embodiment, the composite pipe 6 has an aluminum metal layer 6b sandwiched between synthetic resin layers 6a and 6a.
Reference numeral 7 denotes a metal cap nut, which has an internal thread portion 8 formed with an internal thread n to be engaged with an external thread m of the outer cylinder portion 5 sequentially from the downstream side, and an annular surface having an inner diameter shorter than the inner diameter of the internal thread portion 8. 9 and a composite pipe insertion hole 10 with which the outer periphery j of the composite pipe 6 abuts.
11 is a split ring provided with a plurality of claws 12, and is made of, for example, stainless steel. The split ring 11 has a spring property, and is fitted into the cap nut 7 from the female screw portion 8 side of the cap nut 7 and disposed on the annular surface 9. The split ring 11 has a plurality of claws 12 formed in a sawtooth shape on one side F of a thin stainless steel plate having a rectangular shape that is horizontally long when viewed from the front, and the plurality of claws 12 are located on the inner peripheral surface. Thus, it is rounded into a ring shape so as to wrap the stainless plate. In this embodiment, the downward projecting inclination angle with respect to the one surface F of the stainless steel plate of the claw 12 protrudingly formed on the one surface F of the stainless steel plate is set to 45 °. A large number of the claws 12 are provided in the horizontal direction of the stainless steel plate and vertically, for example, in two rows. And when fitting the said split ring 11 in the cap nut 7 beforehand from the internal thread part 8 side, it is preferable to carry out, shrink | contracting the split ring 11 to radial direction.
In the above configuration, when the cap nut 7 is connected to the joint body 1, the composite pipe is inserted into the annular groove 4 between the annular surface 9 of the cap nut 7 and the composite pipe insertion hole 10 and the inner cylinder portion 3. An annular space S is formed. When the composite pipe 6 is inserted into the annular groove 4 through the annular space S, the numerous claws 12 of the split ring 11 bite into the outer peripheral surface j of the composite pipe 6, thereby connecting the composite pipe 6 to the joint body. 1 can be securely connected.
Further, the inner cylinder portion 3 has a plurality of upper and lower O-ring grooves 14 on the outer peripheral surface t facing the composite pipe insertion hole portion 10 or the annular surface 9, and an O-ring 17 is fitted into the O-ring groove 14. Yes. The O-ring 17 is a member for watertightly sealing the inner surface i when the composite pipe 6 is inserted.
Further, the joint body 1 has a horizontal hole 18 having a small diameter and a circular shape in plan view at a portion where the annular groove 4 is located. The number of the horizontal holes 18 may be one or plural. The horizontal hole 18 is configured to protrude outwardly from the horizontal hole 18 by a guide ring (sleeve) 15 made of metal such as stainless steel or synthetic resin that moves until it is pushed by the composite pipe 6 and comes into contact with the bottom 4 a of the annular groove 4. A means for indicating the end of the inserted insertion operation is provided. This means includes a fitting member 22 including a cylindrical portion 20 and a conical portion 21 having a size to be fitted into the horizontal hole 18, and a disc-shaped cap member 23. The fitting member 22 and the cap member 23 are made of synthetic resin. As shown in FIG. 2, the fitting member 22 is fitted into the horizontal hole 18 so that the conical portion 21 is positioned in the annular groove 4, and the fitting member 22 is capped by fitting the cap member 23 into the horizontal hole 18. Covered with a member 23. A joint body (male adapter body) 1, a cap nut 7, a split ring (spring ring) 11 with claws 12, a guide ring (sleeve) 15, a fitting member 22 and a cap member 23 are used for a one-touch type composite pipe. A metal joint 24 is mainly configured.
The composite pipe 6 is configured to be inserted into the annular groove 4 via a guide ring 15 inserted through the inner cylinder portion 3. That is, the guide ring 15 is a member that guides when the composite pipe 6 is inserted, and the lower end surface 16 does not damage the O-ring (rubber ring) 17. In order to make it easy to pass through, it is formed on a gently curved curved surface. Further, the lower end surface 16 may be formed as a divergent tapered surface. Specifically, an O-ring (rubber ring) 17 in which the inner side surface portion (inner edge surface portion) 16a of the lower end surface 16 of the guide ring 15 is fitted in the O-ring groove 14 protrudes in a chevron shape. It is formed on a curved surface that is gently curved so as not to damage. In other words, the guide ring 15 is a member that retracts the O-ring 17 by the curved surface 16 at the tip and expands the diameter of the split ring 11. Further, the inner side surface portion (inner edge surface) 16a of the lower end surface 16 may be formed in a taper surface having a divergent shape so as not to damage the O-ring 17. Further, the outer surface portion (outer edge surface) 16b of the lower end surface 16 is also formed in a gently curved curved surface or a divergent tapered surface, so that the pawl 12 of the guide ring 15 can be easily passed. That is, when the composite pipe 6 is directly inserted without using the guide ring 15, the composite pipe 6 hits the O-ring 17 in the annular space S, and the O-ring 17 is crushed by the composite pipe 6. This is because the composite pipe end face 6c damages the O-ring 17 or cuts it in the worst case. Further, when the composite pipe 6 is directly inserted without using the guide ring 15, the composite pipe 6 is stopped at the composite pipe end surface 6 c by the split ring 11 in the annular space S, and thereafter, the composite pipe 6 may not be inserted into the annular groove 4. is there.

The characteristic configuration of the present invention will be described below.
The guide ring 15 is formed of a bottomed ring main body, and has an annular pipe insertion groove 26 formed on the upper surface side of the ring main body so that the end E of the composite pipe 6 is inserted, and a lower end surface of the guide ring 15 Reference numeral 16 denotes a gently curved curved surface so as not to damage the O-ring (rubber ring) 17 and to facilitate the advancement of the guide ring 15. The guide ring 15 has an annular insulating packing 27 which is provided in advance in the pipe insertion groove 26 so that the composite pipe end surface E abuts and can prevent the composite pipe end surface E from coming into direct contact with the guide ring 15. . The insulating packing 27 has a rectangular cross section and is attached to the inner surface tip of the guide ring 15 (the lower end surface side of the pipe insertion groove 26).

Thus, the one-touch type metal joint 24 is assembled at the factory shipment stage.
That is, while the split ring 11 with the claw 12 is incorporated into the annular surface 9 of the cap nut 7, the fitting member 22 and the cap member 23 are fitted into the lateral holes 18 of the joint body 1, as shown in FIG. Further, the cap nut 7 and the joint body 1 are connected so that the upper surface q of the composite pipe insertion hole portion 10 and the upper surface p of the inner cylinder portion 3 are substantially flush, and the insulating packing 27 is placed in the pipe insertion groove 26. The one-touch type metal joint 24 is shipped from the factory in a state in which the stored guide ring 15 is fitted in the annular space S between the composite pipe insertion hole 10 and the inner cylinder 3 in advance. Thus, the position of the guide ring 15 and the split ring 11 is fixed when the cap nut 7 and the joint body 1 are connected. Further, the cap nut 7 is connected to the joint body 1 without applying an adhesive or the like to return.
Therefore, at the construction site, the operator inserts both the guide ring 15 and the composite pipe 6 into the annular groove 4 in this order through the annular space S of the metal joint 24 with the metal joint 24 in hand. The composite pipe 6 can be simply connected without using a dedicated compression jig as in the caulking type joint.
That is, in this invention, as shown in FIG. 2, the operator starts the composite pipe insertion operation while inserting the composite pipe 6 into the guide ring 15 via the pipe insertion groove 26. While the composite pipe end face 6a hits the insulating packing 27 in the pipe insertion groove 26, the composite pipe 6 advances to the back in the annular space S with the guide ring 15 attached, and as shown in FIG. While retracting and expanding the split ring 11, the annular space S advances to the annular groove 4. At this time, when the guide ring 15 passes through, the O-ring 17 comes into close contact with the inner surface i of the composite pipe and has a water-tight sealing property. Further, when the guide ring 15 passes through, the split ring 11 returns to its spring property, and the plurality of claws 12 of the split ring 11 prevent the composite pipe 6 from returning (preventing to come off). Further, the split ring 11 compresses the composite pipe 6 by the force of the spring, and improves the sealing performance of the inner cylinder portion 3 and the O-ring 17 and the composite pipe inner surface i. Further, when the composite pipe 6 is advanced to the back, as shown in FIG. 4, the guide ring 15 comes into contact with the annular groove 4 while the curved surface 15 c of the guide ring 15 hits the conical surface 30 of the conical portion 21 by the insertion force of the guide ring 15. Along the bottom surface 4 a of the annular groove 4. Then, when the fitting member 22 slides on the guide ring 15 through the curved surface 15c and the conical surface 30, the fitting member 22 moves together with the cap member 23 in the lateral hole 18 in the outward direction (C direction). The cap member 23 jumps out from 18 and falls. The fall of the cap member 23 becomes a standard for the end of the composite pipe insertion operation. The fitting member 22 and the cap member 23 are preferably colored differently. This is because the operator can easily confirm that the cap member 23 pops out.
Further, before inserting the composite pipe 6, an annular insulating packing 27 is provided in advance in the pipe insertion groove 26 of the guide ring 11, and the composite pipe end surface 6 c where the metal layer 6 b is exposed abuts the insulating packing 27. Since the composite pipe 6 starts to be inserted with the composite pipe end E engaged with the pipe insertion groove 26, the metal of the joint body 1 and the composite pipe end surface 6c are connected in the connected state when the insertion is completed. Of course, the situation where the exposed metal layer 6b comes into contact can be avoided, and the situation where the metal of the guide ring 11 and the exposed metal layer 6b come into contact can also be avoided.

FIG. 6 shows another embodiment of the present invention relating to a joint 24 ′ to which a resin pipe 6 ′ made of a synthetic resin material such as crosslinked polyethylene or polybutene is connected. 6, the same reference numerals as those shown in FIGS. 1 to 5 are the same or equivalent.
In FIG. 6, the joint 24 ′ to which the resin pipe 6 ′ made of a synthetic resin material such as the cross-linked polyethylene or polybutene of this embodiment is connected is a bag in which the split ring 11 provided with the claws 12 is fitted in advance. The nut 7 is connected to the joint body 1 having the inner cylinder part 3 to which the O-ring 17 is attached and the outer cylinder part 5 forming the annular groove 4 with the inner cylinder part 3, and the resin pipe 6 'is connected to the cap nut. This is a one-touch type metal joint that allows the resin pipe 6 ′ to be prevented from coming off by being inserted into the annular groove 4 from the side and biting the claw 12 into the outer peripheral surface j of the resin pipe end E.
Further, the resin pipe 6 ′ is configured to be inserted into the annular groove 4 through a guide ring (sleeve) 15 made of a metal such as stainless steel or a synthetic resin inserted into the inner cylinder portion 3. The guide ring 15 has a lower end surface 16 which is formed in a curved surface or a tapered surface which is divergent so that it can pass through the split ring 11 without damaging the O-ring 17. The guide ring 15 has an annular pipe insertion groove 26 formed so that the resin pipe end E is inserted.

  Thus, the resin pipe 6 ′ made of a synthetic resin material such as cross-linked polyethylene or polybutene is configured to be inserted into the annular groove 4 through the guide ring 15 inserted through the inner cylinder portion 3. Since the end surface 16 is formed in a curved surface or a tapered surface that is divergent, it is possible to prevent a situation in which the O-ring 17 is damaged when the resin pipe 6 ′ is inserted or it is difficult to insert the resin ring 6 with the claw 12 by the split ring 11. . That is, the resin pipe end portion E is inserted into the pipe insertion groove 26 formed in the guide ring 15 and the resin pipe 6 ′ moves to the insertion side with the guide ring 15 mounted. The guide ring 17 is in a state in which the O-ring 17 is retracted without damaging the O-ring 17 while the lower end surface 16 of the guide ring 15 is in contact with the O-ring 17, and the guide ring 15 is Thus, the passage of the split ring 11 is smoothly performed without being blocked by 11.

  (A) is an exploded perspective view showing a guide ring provided with an annular pipe insertion groove provided with an annular insulating packing against which the composite pipe and the end face of the composite pipe abut according to one embodiment of the present invention. . (B) is a top view of the insulation packing in the said embodiment. (C) is sectional drawing of the insulation packing in the said embodiment.   It is composition explanatory drawing which shows the state of a connection start with the composite pipe in the said embodiment.   It is composition explanatory drawing which shows the state in the middle of the connection with the composite pipe in the said embodiment.   It is composition explanatory drawing which shows the state after completion of a connection with the composite pipe in the said embodiment.   It is sectional drawing of the guide ring in the said embodiment.   It is composition explanatory drawing which shows the state after the completion of the connection with the resin pipe in other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint main body 3 Inner cylinder part 4 Annular groove 5 Outer cylinder part 6 Composite pipe 6a Synthetic resin layer 6b Metal layer 6c Composite pipe end surface 7 Cap nut 11 Split ring 12 Claw 15 Guide ring 17 O-ring 24 Metal joint 26 Pipe insertion groove 27 Insulation packing E Composite pipe end j Outer peripheral surface

Claims (3)

A cap nut in which a split ring provided with a claw is fitted in advance is connected to a joint body having an inner cylinder part to which an O-ring is attached and an outer cylinder part that forms an annular groove with the inner cylinder part, One-touch type that enables the resin pipe to be prevented from coming off by inserting a resin pipe made of a synthetic resin material such as polyethylene or polybutene into the annular groove from the cap nut side and biting the claw into the outer peripheral surface of the resin pipe end. Metal fittings of
The resin pipe is configured to be inserted into the annular groove through a guide ring that is inserted into the inner cylinder portion, and the guide ring can pass through the split ring without damaging the O-ring. As described above, the lower end surface is formed into a curved surface or a taper surface having a divergent shape, and the guide ring has an annular pipe insertion groove formed so that the end portion of the resin pipe is inserted. A joint characterized by Connecting a cap nut in which a split ring with a claw is inserted into a fitting main body having an inner cylinder part to which an O-ring is attached and an outer cylinder part forming an annular groove with the inner cylinder part; A composite pipe having at least a three-layer structure in which a metal layer made of a metal material such as aluminum is sandwiched between synthetic resin layers is inserted into the annular groove from the cap nut side through a guide ring inserted into the inner cylinder portion. A one-touch type metal joint that enables the composite pipe to be prevented from coming off by biting the claw into the outer peripheral surface of the composite pipe end,
The guide ring has an annular pipe insertion groove formed so that the end of the composite pipe is inserted, and is provided in advance in the pipe insertion groove so that the end face of the composite pipe comes into contact with the end face of the composite pipe. A joint having an annular insulating packing capable of preventing direct contact with the seal. A one-touch type metal joint for connecting a composite pipe having at least a three-layer structure in which a metal layer made of a metal material such as aluminum is sandwiched between synthetic resin layers made of a synthetic resin material such as crosslinked polyethylene or heat-resistant polyethylene. ,
One end has a connecting portion, and the inside of the connecting portion has an inner cylinder portion extending from one end side toward the other end side, while the connecting portion is directed toward the other end side than the inner cylinder portion. A joint body having an outer cylinder portion that is short and extends to form an annular groove with the inner cylinder portion, and has a male screw on the outer peripheral surface of the outer cylinder portion,
In order from the downstream side, it has a female thread part formed with a female thread that is screwed into the male thread of the outer cylinder part, an annular surface having an inner diameter shorter than the inner diameter of the female thread part, and a pipe insertion hole part with which the outer periphery of the composite pipe abuts A cap nut,
A split ring with a claw that is fitted in the cap nut in advance from the side of the female screw portion of the cap nut and disposed on the annular surface;
A guide ring that is inserted through the inner cylinder portion in advance and inserted into the annular groove together with the composite pipe while being pushed by the composite pipe;
The inner cylinder portion has a plurality of upper and lower O-rings on the outer peripheral surface facing the composite pipe insertion hole portion and / or the annular surface, and when the cap nut is connected to the joint body, An annular space for pipe insertion communicating with the annular groove is formed between the annular surface and the pipe insertion hole and the inner cylinder portion. In this state, the composite pipe is connected to the annular space via a guide ring. When inserted into the annular groove of the joint body from, the claw of the split ring is configured to bite into the outer peripheral surface of the composite pipe end,
Further, the guide ring has an annular pipe insertion groove formed so that the composite pipe end portion is inserted, and is provided in advance in the pipe insertion groove so that the composite pipe end face comes into contact with the composite pipe end face. A joint comprising an annular insulating packing capable of preventing direct contact with the guide ring.

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