JP2015140902A - Pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe joint in which a resin pipe can be connected through single operation and the resin pipe can be positively inserted to a prescribed position while assuring an anti-high temperature performance, a resistance against hot water is being improved and the inserted state of the resin pipe is being confirmed from outside and then the resin pipe can be strongly connected.SOLUTION: A resin pipe 2 inserted into a clearance G between an inner cylinder 4 and an outer cylinder 5 arranged at a joint main body 3 is connected against pull-out prevention state by a lock ring 6, it is further tightly connected by a seal member 7 installed at an outer circumferential surface 4a of the inner cylinder 4, an insertion guide 10 having several resilient tongue pieces 32 at its outer circumference abutted against an end surface 2a when the resin pipe 2 is inserted to guide it is installed between the inner cylinder 4 and the outer cylinder 5 and at the same time a resin sleeve 8 for guiding the insertion guide 10 is installed inside the outer cylinder 5, and a storing part 20 for storing the resilient tongue pieces 32 of the insertion guide 10 is arranged near an interface between the sleeve 8 and the outer cylinder 5.

Description

  The present invention relates to a pipe joint for connecting a resin pipe such as a cross-linked polyethylene pipe or a polybutene pipe to a pipe for water supply or hot water supply in a residential facility with one touch.

  In recent years, water supply and hot water supply pipes for housing facilities have been mainly constructed using resin pipes such as cross-linked polyethylene pipes and polybutene pipes. When these pipes are connected, they can be connected simply by inserting them. A so-called one-touch type pipe joint is often used. In this case, in particular, the one-touch joint needs to prevent insufficient insertion at the time of construction in order to prevent water leakage, and a mechanism for confirming the completion of tube insertion is generally provided.

As this type of pipe joint, for example, the pipe joint of Patent Document 1 is disclosed. This one-touch joint consists of a metal joint body that serves as a water passage, an outer tube made of transparent resin that protects and guides the outer periphery of the pipe, a seal member that seals the inner diameter of the pipe, a lock ring that holds the pipe, a lid A resin cap serving as a member, and an insertion guide for smoothly inserting the tube by guiding it over the seal member when the tube is inserted are provided.
Due to the structure composed of these parts, this one-touch joint is provided so that the tube and the insertion guide can be seen through a resin outer cylinder so that the insertion degree can be confirmed visually. Furthermore, with this one-touch joint, a plurality of elastic tongue pieces are provided on the outer periphery of the insertion guide, and the completion of insertion can be confirmed by the sound generated when this tongue piece exceeds the protrusion provided on the inner diameter of the outer cylinder. It has become.

  On the other hand, the pipe joint of Patent Document 2 is a metal joint member as an instrument connecting part, a see-through cylinder that sees through the pipe and becomes a pressure-resistant part, a seal member that seals the outer periphery of the pipe, and straightens the insertion by correcting the pipe And an in-core for holding the tube, a lock ring for holding the tube, a spacer and a spacer ring, and a metal lid member including a cap nut for holding each member, and the lid member is screwed into the joint member. When the lid member is made of metal like this joint, a visual window for visually checking the insertion degree of the tube from the outside is opened in the lid member, and the operator can connect the inside through the fluoroscopic cylinder. In addition, when the work site is dark, it can be seen through the back of the window.

By the way, since high-temperature water also flows through these pipe joints during hot water supply, it is necessary to be able to confirm the pipe from the outside while avoiding the adverse effects of this high-temperature water. Therefore, for example, in Patent Document 1, the outer cylinder is made of a transparent resin, is lightweight, and can be inserted from the entire circumference side, while being able to confirm the insertion of the pipe from the entire circumference side, to a circulating water heater such as a heat pump water heater in which high-temperature water circulates. The use of is restricted. As a result, in this pipe joint, high temperature resistance is suppressed.
As a result, when a one-touch joint used in a circulating water heater is required to be used at a high temperature, a one-touch joint having a metal lid member that is resistant to high temperatures, such as the pipe joint of Patent Document 2, is provided. Often used.

JP 2012-52574 A Japanese Patent No. 4939686

However, when the outer cylinder and cap which are the see-through | perspective side of a pipe | tube are provided with resin like the former patent document 1, the characteristic in high temperature becomes easy to be inferior compared with the case where it is metal like patent document 2. In particular, transparent nylon is often used as a material for the outer cylinder due to the requirement for transparency, which reduces the strength when used in high temperature and humid environments, and the circulation system exposed to high temperatures for a long time. Use in water heaters is not suitable.
In this pipe joint, in addition to visual inspection from the outside, the elastic tongue on the outer periphery of the insertion guide climbs over the protrusion on the inner periphery of the outer cylinder, and the insertion is confirmed by the sound generated when the tongue hits the outer cylinder. However, since the outer cylinder is made of resin, it may not be possible to obtain a sufficient confirmation sound in a noisy work site or the like.

  On the other hand, in the latter Patent Document 2, by making the lid member made of metal, the high temperature resistance is improved as compared with the case of Patent Document 1, but it is necessary to use a see-through cylinder for seeing from the outside as a pressure-resistant component. Occurs. For this reason, the see-through cylinder is made of, for example, a resin such as PPSU (polyphenylsulfone). In this case, although it has high strength and low water absorption, hydrolysis is less likely to occur, but PPSU is provided with PPSU. In such a case, it becomes translucent and difficult to see from the outside. In addition, since the see-through cylinder is confirmed through the window of the lid member, the window may be hidden depending on the way (orientation) of the piping, which makes the viewing more difficult.

  The present invention has been developed to solve the above-mentioned problems, and the object of the present invention is a pipe joint that can connect a resin pipe with one touch, ensuring high-temperature resistance and resistance to high-temperature water. It is an object of the present invention to provide a pipe joint that can be securely inserted and securely connected to a predetermined position while confirming the insertion state of the resin pipe from outside.

  In order to achieve the above-described object, the invention according to claim 1 is directed to connecting a resin pipe inserted into a gap between an inner cylinder and an outer cylinder provided in a joint body in a pull-out preventing state with a lock ring, and A pipe joint that is hermetically connected by a seal member attached to the surface, and is provided with a plurality of elastic tongue pieces on the outer periphery between the inner and outer cylinders that contact the resin pipe end surface when guiding the resin pipe when the resin pipe is inserted. A pipe joint that is fitted with a guide, and a resin sleeve that guides the insertion guide is attached to the inside of the outer cylinder, and a storage portion is provided in the vicinity of the boundary between the sleeve and the outer cylinder to store the elastic tongue of the insertion guide. It is.

  The invention according to claim 2 is a pipe joint in which an outer cylinder is formed of a resin harder than a metal or a sleeve, and a storage portion is provided on the inner peripheral side of the outer cylinder.

  The invention according to claim 3 is a pipe joint in which a projection portion on which an elastic tongue piece can ride is provided in the vicinity of the boundary with the outer cylinder on the inner periphery of the sleeve.

  The invention according to claim 4 is a pipe joint in which an arc portion is provided on the guide side inner diameter for guiding the sleeve insertion guide.

  The invention according to claim 5 is a pipe joint in which the outer cylinder and the sleeve are positioned and fixed by the concave-convex fitting portion.

  According to a sixth aspect of the present invention, the outer cylinder is provided with a confirmation window through which the inner cylinder side can be seen through the sleeve, and a stepped portion that avoids contact with the inner circumference of the outer cylinder on the outer periphery of the sleeve near the confirmation window. Is a pipe joint provided with a reduced diameter portion that is smaller than the inner circumference of the outer cylinder.

  The invention according to claim 7 is a pipe joint in which an outer cylinder and an inner cylinder are loosely fitted via a retaining ring, and a confirmation window of the outer cylinder is provided to be rotatable with respect to the inner cylinder.

  According to the first aspect of the present invention, there is provided a pipe joint in which a resin pipe is guided between an inner cylinder and an outer cylinder by an insertion guide, and the resin pipe can be connected with one touch via a lock ring. By mounting the resin sleeve on the inside of the outer cylinder, this sleeve can be formed of a material different from that of the outer cylinder, and a storage portion for the elastic tongue of the insertion guide can be provided in the vicinity of these boundaries. . For this reason, the outer cylinder is formed of a material having higher heat resistance than the sleeve to ensure high temperature resistance, and resistance to high temperature water can be improved. Since it is possible to provide all of them with heat-resistant materials, it is possible to provide a pipe joint that can sufficiently withstand use at high temperatures by improving the overall high temperature resistance. By providing the outer cylinder with a material different from the sleeve, it becomes easier to grasp the elastic tongue piece in the storage part with a sound and a click feeling, and confirming the insertion state of the resin tube from the outside to a predetermined position It can be inserted and firmly connected.

  According to the second aspect of the present invention, the outer tongue serving as the storage portion for the elastic tongue on the outer periphery of the insertion guide is formed of a metal or a resin harder than the resin sleeve, thereby improving the high temperature resistance and the elastic tongue. When the inner diameter of the sleeve is reduced and then released and the inner wall of the housing is struck, the sound caused by contact with the hard material increases, and this impact sound is confirmed even at work sites where the surrounding work noise is loud. It becomes easier to check the completion of the connection by increasing the click feeling. Thus, the resin pipe can be connected while being securely inserted to a predetermined position.

  According to the invention according to claim 3, when the insertion of the resin tube proceeds and the insertion guide reaches the projection, the elastic tongue on the outer periphery of the insertion guide is reduced in diameter by the projection and the elasticity is improved. A clearer impact sound and click feeling can be generated to make it easy to confirm the completion of insertion.

  According to the fourth aspect of the present invention, the elastic tongue piece on the outer periphery of the insertion guide can be smoothly guided between the inner and outer cylinders by the circular arc portion of the sleeve guide side inner diameter, and the elastic tongue piece can be smoothly and smoothly inserted with a low risk of damage. A resin tube can be easily connected.

  According to the fifth aspect of the present invention, the position of the sleeve in the insertion direction is fixed by positioning and fixing the outer cylinder and the sleeve by the concave-convex fitting portion, and when the resin pipe is inserted, the sleeve moves to move the lock ring. Smooth insertion is possible by preventing obstruction.

  According to the invention which concerns on Claim 6, it can insert reliably to a predetermined position, confirming the insertion state of the resin pipe visually through a sleeve from a confirmation window, and the step part or reduced diameter part provided in the outer periphery of the sleeve When this sleeve is press-fitted into the outer cylinder, it is mounted to the position of the confirmation window without touching the protruding part such as burrs, and the outer periphery of the sleeve is secured to prevent the outer circumference of the sleeve from being damaged. Visibility from can be improved.

  According to the invention of claim 7, by providing the inner cylinder and the outer cylinder in the union structure via the retaining ring, the confirmation window is located at a position where it is difficult to visually observe the resin pipe such as a dark work site or a narrow installation space. Even in the case where the resin tube is present, the resin tube insertion state can be easily visually recognized from the confirmation window by rotating the confirmation tube of the outer cylinder to a position where the resin tube is visible.

It is the longitudinal cross-sectional view which showed 1st Embodiment of the pipe joint in this invention. It is a perspective view of the pipe joint of FIG. FIG. 2 is an exploded perspective view of the pipe joint of FIG. 1. It is a partially expanded sectional view which shows the insertion start state of a resin pipe. It is a partially expanded sectional view which shows the state which inserted the resin pipe | tube from the state of FIG. It is a partially expanded sectional view which shows the state which insertion of the resin pipe was completed. It is principal part sectional drawing which showed 2nd Embodiment of the pipe joint in this invention.

Hereinafter, embodiments of a pipe joint according to the present invention will be described in detail with reference to the drawings. 1 is a longitudinal sectional view of the first embodiment of the pipe joint of the present invention, FIG. 2 is a perspective view of the pipe joint of FIG. 1, and FIG. 3 is an exploded perspective view of the pipe joint of FIG. ing.
In FIG. 1, a pipe joint (hereinafter referred to as a pipe main body 1) in the present invention can be connected to a resin pipe for water supply / hot water supply in a state of being prevented from coming off with one touch, for example. 3, the joint body 3, the inner cylinder 4, the outer cylinder 5, the lock ring 6, the seal member 7, the sleeve 8, and the C-shaped retaining ring 9 are provided, and the insertion guide 10 is provided in the pipe joint body 1. Installed.

  In FIG. 1, a pipe joint main body 1 has a so-called inner peripheral seal structure that seals the inner peripheral side of a resin pipe 2, and is attached to the inner cylinder 4 provided on the joint main body 3 and the joint main body 3. The resin pipe 2 is inserted into a gap G formed between the outer cylinder 5 and the outer cylinder 5. The resin tube 2 inserted into the gap G is connected to the pull-out preventing state by the lock ring 6 and hermetically connected by the seal member 7 attached to the inner cylinder 4. The resin pipe 2 connected to the pipe joint main body 1 is made of, for example, a pipe such as a crosslinked polyethylene pipe or a polybutene pipe, and in addition to these, various resin pipes such as a metal reinforced polyethylene pipe, or copper It is also possible to connect a metal tube such as a tube.

  The joint body 3 is formed in a cylindrical shape with a hard resin having high rigidity such as a metal such as a copper alloy or a filler-filled PPS (polyphenylene sulfide resin), and is appropriately formed on the connection side of the resin tube 2 according to the inner diameter thereof. An inner cylinder 4 having an outer diameter is provided integrally. The inner cylinder 4 may be mounted as a separate component from the joint body 3.

Mounting grooves 11 and 11 are formed at two locations on the opening side of the outer peripheral surface 4a of the inner cylinder 4, and each mounting groove 11 has a rubber seal member such as FKM (fluoro rubber) or EPDM (ethylene propylene rubber). 7 is attached, and the inner periphery of the resin tube 2 can be hermetically sealed by the seal member 7. An arcuate portion 12 is formed on the outer diameter side of the seal member 7 so that the surface pressure with the resin tube 2 is increased by the arcuate portion 12 and the sealing performance is improved. The seal member 7 is disposed at a position substantially opposite to the lock ring 6.
An annular recess 13 for mounting a retaining ring 9 for attaching the outer cylinder 5 is formed at a predetermined position of the inner cylinder 4, and an annular taper is formed on the outlet side of the outer cylinder 5 of the inner cylinder 4 following the annular recess 13. A portion 14 is formed.

  A male screw 15 is formed on the other side of the joint main body 3 with respect to the inner cylinder 4, and a header, a connecting member, or other external piping (not shown) is connected to the joint main body 3 via the male screw 15. ing. A water passage port 16 is formed inside the joint body 3. The joint body 3 may have a shape other than the linear shape as shown in the figure, and may be provided in, for example, a cheese shape or an elbow shape.

  The outer cylinder 5 is formed in a cylindrical shape with a hard resin having higher heat resistance than a metal such as a copper alloy or a filler-containing PPS, and a storage portion 20 described later is provided on the inner peripheral side of the outer cylinder. . At a predetermined position of the outer cylinder 5, a confirmation window 21 through which the inner cylinder 4 side can be viewed through the sleeve 8 is provided. The confirmation window 21 may be located at a position where only the resin tube 2 can be seen, but it is more preferable that the confirmation window 21 is provided at a position where the resin tube 2 after insertion and the vicinity of the end of the insertion guide 10 can be seen.

  A tapered portion is provided on the opening side of the outer cylinder 5, and further, an enlarged diameter portion 22 is provided following the tapered portion, and a mounting recess 23 and a mounting groove 24 are continuously formed on the inner periphery of the enlarged diameter portion 22. The A lock ring 6 and a spacer 25 are provided in the mounting recess 23, and a lid member 26 is provided in the mounting groove 24 so as to be mountable. A circumferentially concave mounting portion 27 is formed on the back side of the mounting recess 23, and the sleeve 8 is provided in the mounting portion 27 so as to be mountable.

  An annular groove 28 is formed at a position of the outer cylinder 5 facing the annular recess 13 of the inner cylinder 4 described above, and a wire material having a substantially circular cross section is formed between the annular recess 28 and the annular recess 13 in a C shape. The formed metal retaining ring 9 is attached. The outer cylinder 5 and the inner cylinder 4 are connected in a loosely fitted state via a retaining ring 9 so that the outer cylinder 5 can be rotated with respect to the inner cylinder 4. An annular tapered surface 29 is formed following the annular recessed groove 28 at a position of the outer cylinder 5 facing the annular tapered portion 14 of the inner cylinder 4.

  As shown in FIG. 1, an insertion guide 10 is mounted in the gap G between the integrated inner cylinder 4 and outer cylinder 5. The insertion guide 10 contacts the resin tube end surface 2a when the resin tube 2 is inserted, and guides the resin tube 2. For example, the insertion guide 10 is provided with a snap fit resin such as POM (polyacetal) and the like. An arcuate portion 30 is formed on the peripheral tip side, a locking end 31 is formed on the inner peripheral rear end side, and an elastic tongue piece 32 is formed on the outer peripheral side.

  The arcuate portion 30 is provided in a curved shape that can easily guide the seal member 7, and a cylindrical surface 33 for press-contacting the seal member 7 is formed following the arcuate portion 30. The inner diameter of the cylindrical surface 33 is an intermediate dimension between the outer diameter of the seal member 7 and the inner diameter of the resin tube 2, and is larger than the inner diameter of the locking end 31. Thereby, the crushing margin of the sealing member 7 by the cylindrical surface 33 is set smaller than that by the locking end 31, and the sealing member 7 is inserted between the insertion guide 10 and the resin tube 2 without receiving a large load from the cylindrical surface 33. It can be inserted smoothly into the gap G.

  The locking end 31 is formed in a protruding shape capable of locking the seal member 7 following the cylindrical surface 33, and the inner diameter of the locking end 31 is substantially the same as or slightly smaller than the inner diameter of the resin tube 2. Is provided. Thus, the contact portion of the insertion guide 10 with the seal member 7 is stronger than the arcuate portion 30 that first contacts the seal member 7, the cylindrical surface 33 that presses the seal member 7, and the cylindrical surface 33. It is comprised by the surface of three steps of the latching end 31 which press-contacts the sealing member 7. FIG.

  The elastic tongues 32 on the outer periphery of the insertion guide 10 are formed at equal intervals so as to protrude outwardly from the outer peripheral portion of the insertion guide 10 in a plurality of places, for example, four locations, and are larger than the inner diameter of the sleeve 8. The outer diameter is the same as or slightly larger than the inner diameter of 20. The elastic tongue 32 is provided in a size that can be stored in the storage portion 20, and a locking projection 34 is formed projectingly at the end thereof. A lock ring 6 can be attached to the side of the elastic tongue 32 that contacts the resin tube 2. When the lock ring 6 is attached, a claw portion 35 of the lock ring 6 to be described later engages inside the elastic tongue 32. Thus, the insertion guide 10 is temporarily fixed to the lock ring 6.

  The sleeve 8 is made of a highly transparent resin such as transparent nylon, and a convex-concave fitting portion 40 is formed in an annular shape on the outer peripheral side thereof. The concave / convex fitting portion 40 can be fitted into a concave / convex concave / convex fitting portion 41 formed in an annular shape at the position inside the outer cylinder 5, and by fitting these concave / convex fitting portions 40, 41, the outer cylinder 5 is mounted on the inner side of the outer cylinder 5 in a state where it is positioned at least in the axial direction of the joint. The insertion guide 10 and the resin tube 2 guided by the insertion guide 10 are guided and inserted into the gap G through the sleeve 8. Although not shown, a concave / convex fitting portion may be provided on the outer peripheral side of the sleeve 8, and a concave / convex fitting portion for fitting to the concave / convex fitting portion may be provided inside the outer cylinder.

  In the vicinity of the boundary between the inner periphery of the sleeve 8 and the outer cylinder 5, an annular protrusion 42 is formed in a hook shape, and an elastic tongue piece 32 of the insertion guide 10 is provided on the protrusion 42 so as to ride on. ing. When the insertion guide 10 is pushed by the resin tube 2 and moves in the back direction in the gap G, and the locking projection 34 of the elastic tongue 32 reaches the projection 42, the elastic tongue 32 rises in the radial direction. The elastic energy is stored in the outer diameter direction.

  A circular arc portion 43 is formed on the guide side inner diameter for guiding the insertion guide 10 of the sleeve 8. When the insertion of the insertion guide 10 is started, the resin tube 2 is guided while guiding the insertion guide 10 through the arc portion 43. Can be inserted.

As shown in FIGS. 4 to 6, the outer diameter of the sleeve 8 in the vicinity of the confirmation window 21 is provided with a reduced diameter portion 44 having a diameter slightly smaller than the inner diameter of the outer cylinder 5. The contact between the sleeve 8 and the inner periphery of the outer cylinder 5 is avoided by the portion 44. In the present embodiment, the reduced diameter portion 44 is provided, but the sleeve 8 may be any one that avoids contact with the outer cylinder 5 in the vicinity of the confirmation window, and other than providing the reduced diameter portion 44, for example, the outer periphery of the sleeve You may make it provide a level | step-difference part in a part of.
In the vicinity of the boundary between the sleeve 8 and the outer cylinder 5, a storage portion 20 capable of storing the elastic tongue 32 is provided. The storage portion 20 is provided with a slightly enlarged diameter on the inner periphery of the outer cylinder 5 described above.

  In FIG. 3, the lock ring 6 is formed in a substantially annular shape from stainless steel or the like, and has an annular portion 50 and a claw portion 35 on the inner diameter side of the annular portion 50. The claw portion 35 is bent from the annular portion 50 at a predetermined inclination angle, and is provided on the surface of the resin tube 2 so as to be locked. The lock ring 6 is mounted in the mounting recess 23 described above, and the resin tube 2 is smoothly inserted by the claw portion 35, and the claw portion 35 is locked to the resin tube 2, whereby a pulling load is applied to the resin tube 2. Even in such a case, the resin tube 2 is prevented from coming off by exhibiting a pull-out preventing force. The lock ring 6 is rotatable even after the resin tube 2 is inserted.

  The spacer 25 is formed in an annular shape that can be mounted in the mounting recess 23 by a metal material or a hard resin. The lid member 26 is formed in the shape of a retaining ring that can be mounted in the mounting groove 24 by a metal material having high strength and springiness, such as a stainless material. The lid member 26 can be reduced in diameter. When the pipe joint main body 1 is assembled, the lid member 26 is reduced in diameter with an appropriate jig and fitted into the mounting groove 24. The spacer 25 and the lid member 26 are provided to hold each component mounted in the outer cylinder 5 inside, and when the water pressure is applied or a load is applied in the pulling direction, the internal component is pulled out. Plays a role in preventing.

Then, the case where the pipe joint mentioned above is assembled is demonstrated.
As shown in FIG. 1, first, the seal member 7 is first attached to each attachment groove 11 of the inner cylinder 4, and the retaining ring 9 is attached to the annular groove 13.
On the other hand, the sleeve 8 is inserted into the inner periphery of the outer cylinder 5, and the convex / concave fitting portion 40 formed on the outer periphery of the sleeve 8 is fitted into the concave / concave fitting portion 41 of the outer cylinder 5. In this manner, the sleeve 8 is inserted into the outer cylinder 5 in a positioned state.

  When the sleeve 8 is inserted, when the end portion reaches the confirmation window 21 of the outer cylinder 5, the diameter-reduced portion 44 provided on the sleeve 8 allows smooth movement without contacting the protruding portion such as the edge of the confirmation window 21. Insertion becomes possible. This reliably prevents the sleeve 8 from being inserted and the outer periphery of the sleeve from being damaged. The same function is exhibited when a step portion is provided in the vicinity of the confirmation window 21 of the sleeve 8 instead of the reduced diameter portion 44.

  In this case, the sleeve 8 is inserted into the inner periphery of the outer cylinder 5 without being press-fitted by forming the outer periphery of the sleeve 8 substantially the same as the inner periphery. Since the concave and convex fitting portions 40 and 41 are set to be fitted when the sleeve 8 approaches the completion of insertion, the insertion is completed when the concave and convex fitting portions 40 and 41 are fitted. In this state, there is a slight gap (not shown) between the tip of the sleeve 8 in FIG. 4 and the stepped portion 46 provided on the inner periphery of the outer cylinder 5. The sleeve 8 is positioned and fixed in a state in which movement of the joint in the axial direction is prevented, and can be rotated by fitting the concave and convex fitting portions 40 and 41. Accordingly, the sleeve 8 is set so as not to receive a pressing force from the outer cylinder 5.

  A state in which the retaining ring 9 is fitted into the annular groove 28 by using a tool such as a hand press on the outer cylinder 5 to which the sleeve 8 described above is attached or a hand press or the like on the inner cylinder 4 to which the retaining ring 9 is attached. Until the outer cylinder 5 and the inner cylinder 4 are loosely fitted. At the time of this insertion, the retaining ring 9 is reduced in diameter by the annular tapered surface 45 formed on the inner diameter of the outer cylinder 5, so that the outer cylinder 5 can be inserted into the inner cylinder 5 without using a jig or the like for reducing the diameter of the retaining ring 9. The fitting is completed only by inserting the cylinder 4 in the axial direction.

  A lock ring 6 in which the mounting guide 10 is mounted (temporarily fixed) from the opening side of the integrated inner cylinder 4 and outer cylinder 5 is attached to the mounting recess 23, and a spacer 25 is mounted in the mounting recess 23 from above. If the cover member 26 is fitted in the mounting groove 24 while reducing the diameter of the lid member 26 in this state, the internal components are prevented from being detached by the lid member 24 and the assembly of the pipe joint body 1 is completed.

Next, the operation and action when the resin pipe 2 is inserted into the pipe joint body 1 will be described.
FIG. 1 shows a state in which the resin tube 2 is started to be inserted, and shows a moment when the resin tube end surface 2 a comes into contact with the insertion guide 10. At this time, the seal member 7 on the inlet side is compressed by the cylindrical surface 33 of the insertion guide 10 to be slightly looser than a predetermined crushing allowance. Therefore, the insertion guide 10 is supported by the outer diameter of the seal member 7 and is automatically aligned with respect to the axis of the pipe joint body 1.

  When the resin tube 2 is inserted from this state and the resin tube 2 passes through the lock ring 6 and the insertion guide 10 reaches the arc portion 43 on the inner periphery of the sleeve 8, the elastic tongue 32 is guided by the arc portion 43. While being gradually reduced in diameter, the insertion guide 10 starts to ride up while pressing the front seal member 7 by the arcuate portion 30 on the inner periphery. Since the inner diameter of the cylindrical surface 33 is smaller than the outer diameter of the seal member 7 and larger than the inner diameter of the resin tube 2, the insertion guide 10 is smoothly inserted. When the locking end 31 of the insertion guide 10 reaches the seal member 7, the locking end 31 compresses while pressing the seal member 7, thereby reducing the force required for insertion and inserting the insertion guide without applying unnecessary force. 10 gets over the seal member 7 on the near side. Further, when the resin tube 2 is inserted from the state shown in FIG. 4, the insertion tube 10 gets over the seal member 7 on the back side as well, so that the resin tube 2 can be easily inserted.

  When the insertion is advanced to the state of FIG. 5, the insertion guide 10 is in a state immediately before reaching the protrusion 42 on the inner periphery of the sleeve 8. When further inserted from this state, the elastic tongue piece 32 rides on the protruding portion 42, and the elastic tongue piece 32 is reduced in diameter in the inner circumferential direction by the protruding portion 42. At this time, since the insertion load temporarily increases, the operator can grasp that the insertion is almost completed.

  In FIG. 6, when the elastic tongue piece 32 gets over the protrusion 42, the insertion load is reduced at that moment, and the opened elastic tongue piece 32 is expanded by the elastic energy stored in the reduced diameter, and the original load is reduced. The state is restored to a state where the diameter is slightly reduced. For this reason, sound and vibration (click feeling) generate | occur | produces when the latching convex part 34 strikes the inner wall of the accommodating part 20 shockingly. At that time, since the outer cylinder 5 constituting the storage unit 20 is formed of metal or hard resin, sound and click feeling increase, and it is easy to understand the completion of insertion of the resin tube 2. In addition, since the insertion guide 10 is vigorously moved to the back side of the joint body 3, the elastic tongue pieces 32 are increased in diameter at the same time, and sound and click feeling are effectively generated. After the insertion of the resin tube 2 is completed, the distal end side of the insertion guide 10 abuts the inside of the inner cylinder 4 and the elastic tongue piece 32 is inserted into a predetermined position in a state where the elastic tongue piece 32 is engaged with the storage portion 20.

  After the resin tube 2 is inserted, the resin tube 2 and the insertion guide 10 can be visually recognized from the confirmation window 21 through the sleeve 8. In addition, since the inner cylinder 4 and the outer cylinder 5 are fitted in a union structure via the retaining ring 9, a position where the confirmation window 21 can be viewed by rotating the outer cylinder 5 with respect to the inner cylinder 4. The insertion state of the resin tube 2 can be confirmed through the confirmation window 21. Therefore, the resin tube 2 can be reliably inserted and connected to a predetermined position.

  When a tensile load such as water pressure is applied after the outer cylinder 5 and the inner cylinder 4 are assembled, the retaining ring 9 is pressed against the annular taper portion 14 of the inner cylinder 4 as shown by a two-dot chain line in FIG. Since the taper angle of the portion 14 is deformed in the diameter increasing direction indicated by the arrow, there is no possibility that the outer cylinder 5 and the inner cylinder 4 come off.

  In the case of the pipe joint body 1 having the above-described structure, even if the sleeve 8 is omitted, it has a function as a joint. However, when the insertion guide 10 is used in this state, the insertion guide 10 passes through the confirmation window 21. If the elastic tongue 32 is caught on the confirmation window 21, the insertion may be incomplete. In order to prevent this, it is necessary to provide the sleeve 8 in the case of the insertion guide 10 having the elastic tongue 32. In addition, when the insertion confirmation is performed only by sound and click feeling, the confirmation window 21 can be omitted, and at this time, the elastic tongue 32 is not caught by the confirmation window.

  As described above, in the pipe joint according to the embodiment of the present invention, the insertion guide 10 is mounted between the inner cylinder 4 and the outer cylinder 5, and the resin sleeve 8 that guides the insertion guide 10 is attached to the outer cylinder 5. A storage portion having a smaller inner diameter than the outer diameter of the elastic tongue 32 while accommodating a plurality of elastic tongues 32 provided on the outer periphery of the insertion guide 10 near the boundary between the sleeve 8 and the outer cylinder 5. 20, the outer cylinder 5 can be provided with a material excellent in characteristics at high temperatures, for example, a material such as metal or a resin harder than the sleeve 8, so that the high temperature resistance can be improved. Since the resin tube 2 can be visually confirmed from the confirmation window 20, the sound at the time of the collision of the elastic tongue 32 to the outer cylinder 5 can be heard, and the click feeling can be confirmed by the tactile sense of the hand. The insertion state can be grasped from the outside.

  Since the pipe joint body 1 has an inner peripheral seal structure, it is not necessary to provide the sleeve 8 with a resin material having pressure resistance. By forming the sleeve 8 with a resin material having transparency, it is easily visible from the outside. Become.

In FIG. 7, 2nd Embodiment of the pipe joint of this invention is shown. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the pipe joint main body 60 of this embodiment, when the sleeve 8 is inserted and fixed to the outer cylinder 5, a predetermined position of the outer cylinder 5 is set so that the tip of the sleeve 8 can be positioned at the opening portion of the confirmation window 21. A confirmation window 21 is formed.
Thereby, the insertion guide 10 after completion of the insertion of the resin tube 2 can be visually recognized directly from the confirmation window 21. For this reason, for example, the insertion guide 10 is molded with a material colored in a color that is easily visible from the outside such as red, or the insertion guide 10 after molding is colored with a color that is easily visible, so that the insertion guide 10 is easily visible from the outside. Become.

  The embodiment of the pipe joint according to the present invention has been described in detail above, but the present invention is not limited to the description of the embodiment, and departs from the spirit of the invention described in the claims of the present invention. Various changes can be made without departing from the scope.

  Accordingly, various types of pipe joints having a structure in which a resin pipe is inserted into the gap between the inner cylinder and the outer cylinder provided in the joint body and the resin pipe is sealed and connected with a seal member while preventing the resin pipe from being pulled out. For example, an outer cylinder can be integrally formed on the joint body, and the inner cylinder provided separately can be fixed to the joint body by an appropriate fixing means such as fitting. In addition, it is possible to make changes such as increasing the lock ring to enhance the resin tube removal prevention effect.

DESCRIPTION OF SYMBOLS 1 Pipe fitting main body 2 Resin pipe 2a End surface 3 Joint main body 4 Inner cylinder 4a Outer peripheral surface 5 Outer cylinder 6 Lock ring 7 Sealing member 8 Sleeve 9 Retaining ring 10 Insertion guide 20 Storage part 21 Confirmation window 32 Elastic tongue piece 40, 41 Concavity and convexity fitting Joint part 42 Projection part 43 Arc part 44 Reduced diameter part G Gap

Claims (7)

  This is a pipe joint in which a resin pipe inserted into a gap between an inner cylinder and an outer cylinder provided in a joint body is connected to a pull-out preventing state with a lock ring and hermetically connected with a seal member attached to the outer peripheral surface of the inner cylinder. In addition, an insertion guide provided with a plurality of elastic tongue pieces on the outer periphery that contacts the resin tube end surface and guides the resin tube is inserted between the inner and outer cylinders, and the insertion guide is guided. A pipe joint, wherein a resin sleeve is mounted on the inner side of the outer cylinder, and an accommodating portion for accommodating an elastic tongue piece of the insertion guide is provided in the vicinity of the boundary between the sleeve and the outer cylinder.   The pipe joint according to claim 1, wherein the outer cylinder is formed of a metal or a resin harder than the sleeve, and the storage portion is provided on an inner peripheral side of the outer cylinder.   The pipe joint according to claim 1 or 2, wherein a protrusion capable of riding on the elastic tongue piece is provided in the vicinity of a boundary between the inner periphery of the sleeve and the outer cylinder.   The pipe joint according to any one of claims 1 to 3, wherein an arc portion is provided on a guide-side inner diameter for guiding the insertion guide of the sleeve.   The pipe joint according to any one of claims 1 to 4, wherein the outer cylinder and the sleeve are positioned and fixed by an uneven fitting portion.   The outer cylinder is provided with a confirmation window through which the inner cylinder side can be seen through the sleeve, and a stepped portion that avoids contact with the inner circumference of the outer cylinder on the outer periphery of the sleeve in the vicinity of the confirmation window. The pipe joint according to any one of claims 1 to 5, further comprising a reduced diameter portion that is smaller than the inner circumference of the outer cylinder.   The pipe joint according to claim 6, wherein the outer cylinder and the inner cylinder are loosely fitted via a retaining ring, and a confirmation window of the outer cylinder is provided to be rotatable with respect to the inner cylinder.

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