JP5898850B2 - Pipe fitting - Google Patents

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 residential facilities and the like are mostly constructed using resin pipes such as cross-linked polyethylene pipes and polybutene pipes. Pipe fittings are often used. In addition to easy insertion of resin pipes, this type of pipe joint is also required to be able to confirm the pipe insertion (connection) state from the viewpoint of construction management and the like. Confirmation of the insertion state has been performed mainly by visual observation, but pipe joints that are easier to perceptually confirm to make piping work more efficient are known.

  As such a pipe joint, for example, a pipe joint of Patent Document 1 is known. This pipe joint has a tightening ring with a slit for tightening with a resilient tightening force, and a diameter expanding piece, and the diameter expanding piece resists the resilience of the tightening ring. The fastening ring is detachably held at the end of the slit so as to expand the diameter, and comes into contact with the tip of the pipe to be detached. When a pipe is inserted into this pipe joint, the fastening ring is reduced in diameter by its elastic force at the moment when the diameter-expanded piece is detached by the end of the pipe, and the pipe is tightened and a snapping sound is generated. . The worker can perceive the completion of the pipe insertion by the separation sound.

  The pipe joint of Document 2 is located on the outer periphery of the resin pipe, has a flange on the joint inlet side, a spring holder having a slit on the back side, a support ring inserted through the spring holder, and an inner periphery of the spring holder. It has a structure having a guide ring for restricting the falling of the wing and an extension spring held in a compressed state between the flange and the support ring. When a resin pipe is inserted into this pipe joint, the guide ring is detached from the spring holder by this insertion, the slit is reduced in diameter, and the support ring is detached from the spring holder, whereby the spring is extended and the water stop O-ring is interposed. The resin ring is held by pushing the lock ring into the tapered surface of the outer cylinder to reduce the diameter. At this time, an impact sound is generated with the extension of the spring, and the operator confirms the completion of tube insertion by perceiving this sound.

  The joint of Patent Document 3 has a protective cover in which a locking protrusion is formed on the outer peripheral surface of the tongue on the end side, and this protective cover is a locking groove provided on the inner peripheral surface inside the joint body. In the state in which the locking protrusion is locked, the joint body is accommodated. When the connecting pipe is inserted into the joint, the flange end comes into contact with a locking flange formed at the back end of the protective cover, and a force for moving the protective cover to the back side acts. At this time, the locking ridge is detached from the locking groove and moved to the collision sound generating groove formed on the inner peripheral side of the joint body, and the locking ridge is moved into the collision sound generating groove by the elastic restoring force of the tongue piece. A collision sound is generated when fitting.

In the pipe joint of Patent Document 4, a pipe guide ring is provided in an annular gap chamber into which a pipe to be connected is inserted, and the pipe to be connected is guided and guided by this pipe guide ring. In this pipe joint, the pipe guide ring is inserted from the outside of the gap chamber of the pipe joint and mounted at a predetermined position.
In the one-touch joint for resin pipes of Patent Document 5, an insertion guide for pipe guide is externally fitted to an inner cylinder portion in the joint body. The insertion ring is formed with a step portion on which a holding claw of a lock ring mounted in the joint body is temporarily attached. The insertion guide is inserted from the opening side of the joint body and temporarily attached at a predetermined position after the joint body is assembled, as in the same document 4.

Japanese Patent No. 3411546 JP 2003-106490 A JP 2007-177992 A JP 2008-291886 A JP 2010-2022 A

However, the pipe joint of Patent Document 1 has a structure in which the tightening ring fastens the pipe at the moment when the diameter-expanded piece is detached from the end of the pipe, and the pipe is restrained and inserted when tightened by the tightening ring. It has a structure to stop. For this reason, this pipe joint requires a space in which the diameter of the tightening ring is reduced, and the pipe joint has a large diameter.
Further, since this pipe joint is not provided with a part for guiding the pipe, there is a possibility that the sealing O-ring may be damaged by the insertion end of the pipe. In order to avoid this, if the crushing margin of the O-ring is reduced or bonded, the sealing performance by the O-ring may not be ensured.

  The pipe joint of the same document 2 generates impact sound by four parts of extension spring, spring holder, support ring, and guide ring. Therefore, the number of parts is large, the internal structure is complicated, and the production cost increases. It was.

  The joint of the same document 3 also requires a separate part that is a protective cover for pipe insertion detection, and further, it is necessary to provide a locking groove and a collision sound generating groove inside the joint body. It has a complicated structure with many parts such as separation. Furthermore, as in the same document 1, if the O-ring is easily damaged by the connecting pipe end, and the pipe end is in an obliquely cut state, the O-ring is partially pushed out of the groove by the pipe end. There was a risk of sticking out.

  On the other hand, in the same document 4, it is necessary to attach the pipe guide ring body so as to be inserted from the outside of the pipe joint, so that it is difficult to attach the pipe guide ring body to a predetermined position. There was a danger of. For this reason, even when this type of pipe guide ring is mounted inside for confirmation of tube insertion, there is a possibility that it will not be mounted at an appropriate position if it is inserted from the outside.

In the same document 5, similarly to the same document 4, since the insertion guide is inserted from the opening side of the joint body after assembly, there is a possibility that it is displaced from a predetermined position during temporary attachment.
Furthermore, there has been a demand for a technique for improving the efficiency of assembly of the entire joint, including the incorporation of an insertion guide.

  The present invention has been developed to solve the above-described problems, and the object of the present invention is to easily confirm the connection of the resin pipe with a simple internal structure by perception, and to seal after the resin pipe is connected. It is an object of the present invention to provide a pipe joint that can be easily inserted into a predetermined connection state and firmly connected without damaging the structure.

In order to achieve the above-mentioned object, the invention according to claim 1 is a resin pipe inserted into a gap between an inner cylinder and an outer cylinder provided in a joint body, connected in a pull-out preventing state by a lock ring, and A pipe joint hermetically connected by a seal member attached to the outer peripheral surface, wherein an insertion guide for guiding the resin pipe is attached between the inner and outer cylinders, and an elastic tongue piece is provided on the outer periphery of the insertion guide, A pipe joint in which the outer diameter of the piece is set larger than the inner diameter of the outer cylinder, and sound and vibration are generated when the elastic tongue piece is reduced in diameter and restored from the state where the elastic energy in the radial direction is stored. It is. The invention according to claim 2 is a seal member in which a resin pipe inserted in a gap between an inner cylinder and an outer cylinder provided in a joint body is connected in a pull-out preventing state with a lock ring, and is attached to an outer peripheral surface of the inner cylinder. A pipe joint for sealing connection, in which an insertion guide for guiding a resin pipe is mounted between the inner and outer cylinders, and a plurality of elastic tongue pieces are provided on the outer periphery of the insertion guide. It is a pipe joint that is set to be larger than the inner diameter, and has a concave housing part for generating sound and vibration with an elastic tongue piece at the inner diameter inner part of the outer cylinder.

According to a third aspect of the present invention, there is provided a pipe joint in which the insertion guide is mounted in a temporarily fixed state between a lock ring mounted on the opening side of the outer cylinder and a seal member provided at a position facing the lock ring. It is.

According to a fourth aspect of the present invention, there is provided a pipe joint in which an engaging convex portion provided at an end portion of the elastic tongue piece is engaged with an internal diameter convex portion provided at a starting end position of the concave storage portion of the outer cylinder.

In the invention according to claim 5 , a distance allowing oblique cutting of the resin tube is provided between the position of the locking convex portion of the elastic tongue piece and the entrance of the concave storage portion with the insertion guide reaching the depth of the joint. It is a pipe joint.

According to the invention according to claim 1 or 2 , when the resin tube is inserted, the elastic tongue pieces on the outer periphery of the insertion guide are restored by the elasticity at the moment when they hit the concave storage portion, and the inner surface of the concave storage portion is shocked. A sound / vibration can be generated by hitting a part, and the connection of the resin tube can be detected by hearing the sound at this time and perceiving the vibration by touch. For this reason, it is easy to confirm the insertion state of the resin pipe by a perception other than vision, and even if the construction environment is poor, such as when the joint is placed in a place where it is difficult to see directly, the auditory / tactile sensation is not affected by visual observation. Also, it is possible to reliably know the completion of the resin tube insertion. Since the insertion guide can be integrally formed with the elastic tongue piece, it can be provided in a simple internal structure without increasing the number of parts. The guide of the insertion guide prevents the end surface of the resin tube from damaging the sealing member, and the resin tube can be inserted to a predetermined position and firmly connected without impairing the sealing performance.

According to the invention of claim 3 , since the insertion guide can be held in a temporarily fixed state between the lock ring and the seal member, the pipe joint is temporarily arranged in a direction to insert the resin pipe downward. Even if the insertion tube is inserted, the insertion guide can reach the back only when the insertion of the resin tube is completely prevented to prevent the insertion guide from falling. It can also be easily determined by visual inspection.
Further, the insertion ring is temporarily assembled to the lock ring in advance, and in this state, the insertion ring is temporarily attached so as to dispose the insertion ring between the lock ring and the seal member. At the same time, it can be reliably disposed at a predetermined position, and the insertion ring can be firmly supported by the seal member and the lock ring to maintain this temporarily assembled state.

According to the invention of claim 4 , when the locking convex portion is hooked on the inner diameter convex portion, and the elastic tongue piece that is bent deeper by applying further insertion force from this state gets over the inner diameter convex portion This speeds up the generation of sound and vibrations, so that it is easy to detect the completion of insertion of the resin tube.

According to the invention of claim 5 , even when the resin tube is obliquely cut, all the plurality of elastic tongues displaced in the length direction of the insertion guide deformed by inclining along the end surface of the resin tube are all concave. It is possible to guide to the storage portion, and it is possible to prevent a part of the elastic tongue pieces from being guided, to ensure a large sound / vibration, and to easily detect the completion of the resin tube insertion. Further, in addition to the oblique cutting of the resin tube, all the elastic tongue pieces can be securely stored in the concave storage portion while allowing an error in the insertion degree of the insertion guide.

1 is a half-sectional view showing an embodiment of a pipe joint according to the present invention. FIG. 2 is a half-sectional view showing a state where a resin pipe is inserted into the pipe joint of FIG. 1. FIG. 6 is a half-sectional view showing an insertion guide. It is an exploded view which shows the state before insertion guide mounting | wearing. It is the front view which showed the integration state of the semi-assembly. It is an enlarged front view which shows the state before the assembly | attachment of the pipe joint of this invention. It is an enlarged front view which shows the state after the assembly | attachment of the pipe joint of this invention. (A) is a perspective view of an insertion guide. (B) is a front view of an insertion guide. (C) is AA sectional drawing of (b). It is the principal part expanded sectional view which showed the latching state of the nail | claw part. It is an expanded sectional view showing the insertion start state of a resin pipe. It is an expanded sectional view which shows the state which inserted the resin pipe | tube further from the state of FIG. It is an expanded sectional view which shows the state which inserted the resin pipe | tube further from the state of FIG. It is an expanded sectional view which shows the state which inserted the resin pipe | tube further from the state of FIG. It is an expanded sectional view showing the state where insertion of a resin pipe was completed. It is an expanded sectional view which shows the state which inserted the resin pipe of the diagonal cut. It is a principal part expanded sectional view which showed other 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. FIG. 1 is a half-sectional view showing an embodiment of a pipe joint according to the present invention. FIG. 2 shows a state in which a resin pipe is inserted, and FIG. A cross-sectional view is shown.

  In the figure, a pipe joint main body 1 according to the present invention can be connected, for example, with a resin pipe 2 for water supply / hot water supply being prevented from coming off, a joint main body 5 provided with an inner cylinder 3 and an outer cylinder 4, and a cap. 6, a lock ring 7, and a seal member 8, and an insertion guide 10 is mounted in the pipe joint body 1. As the resin tube 2, for example, a tube such as a cross-linked polyethylene tube or a polybutene tube can be used. In addition, various resin tubes such as a metal reinforced polyethylene tube, or a metal such as a copper tube can be used. It is also possible to connect tubes.

  The inner cylinder 3 is integrally formed in the joint body 5 in the present embodiment, the outer cylinder 4 is attached to the joint body 5, and a gap G is formed between the inner cylinder 3 and the outer cylinder 4, The resin pipe 2 is inserted into the gap G. The joint body 5 is formed in a cylindrical shape from a highly rigid resin such as a metal such as a copper alloy or PPS (polyphenylene sulfide resin), and has a flow passage port 11 for water passage. The inner cylinder 3 is provided on the side of the joint body 5 to which the resin tube 2 is connected and has an appropriate outer diameter corresponding to the inner diameter of the resin tube 2. The inner cylinder 3 may be attached to the joint body as a separate part.

  A mounting groove 12 is formed in the outer peripheral surface 3a of the inner cylinder 3, and a sealing member 8 made of a rubber O-ring such as EPDM is mounted in the mounting groove 12. With this structure, the pipe joint main body 1 is a one-touch joint having an inner peripheral seal structure in which the inner periphery of the resin pipe 2 is hermetically sealed with a seal member 8 attached to the outer peripheral surface 3 a of the inner cylinder 3. The mounting grooves 12 are formed at two locations, that is, the opening side from which the resin pipe 2 of the joint body 5 is pulled out, and the insertion side of the resin pipe 2 from the opening side. , 8 are mounted. Accordingly, the seal member 8 is disposed at a position facing the lock ring 7.

  An uneven engaging portion 14 is formed on the outer periphery of the joint body 5, and the outer cylinder 4 is attached to the engaging portion 14. A male screw portion 16 is provided on the other side of the joint body 5 with respect to the inner cylinder 3, and a header, a connecting member, or other external piping (not shown) can be connected to the male screw portion 16. The joint body 5 may have, for example, a cheese shape or an elbow shape other than the linear shape as illustrated.

  The outer cylinder 4 is provided with a resin such as amorphous nylon or PPSU (polyphenylsulfone resin) in a transparent or translucent manner, and the resin tube 2 and the insertion guide 10 are inserted from the outside of the outer cylinder 4. Can be seen through.

A concave storage portion 20 for generating sound and vibration by being struck by the elastic force of an elastic tongue piece 35 to be described later is formed at the inner diameter back portion of the outer cylinder 4. It is formed with a length W in the pipe joint axial direction. The length W is formed such that the place where the locking convex portion 38 of the elastic tongue 35 is located farther than the entrance 20a of the concave storage portion 20 with the insertion guide 10 reaching the depth of the joint, Accordingly, a distance (space) L that allows the resin tube 2 to be obliquely cut can be formed between the position of the locking convex portion 38 and the entrance of the concave storage portion 20. This distance L is set to a length that allows an amount of deviation Δ of the resin tube described later.
On the entrance 20a side of the concave storage portion 20, a bowl-shaped inner diameter convex portion 21 having a diameter smaller than the inner diameter of the inner peripheral surface 4a of the outer cylinder 4 is formed in an annular shape. It is formed in the joint back part side rather than the position of the end surface 2a of the resin pipe at the time of insertion completion when inserted in the joint main body 1.

  An engagement portion 22 that can be snap-fitted to the engagement portion 14 of the joint main body 5 is provided at an attachment position of the outer cylinder 4 on the inner peripheral side of the joint main body 5. Is provided with a concave and convex engaging stepped portion 23. The outer cylinder 4 is integrated with the joint main body 5 by snap fitting of the engaging portions 14 and 22, and after the fitting, the outer cylinder 4 and the joint main body 5 are in a state where they can rotate with each other. Although not shown in the drawing, the inner diameter of the outer periphery side of the outer cylinder 4 is set to be approximately the same as the outer diameter of the insertion guide 10. An inwardly tapered surface 25 and an R surface 26 that gently connects to the tapered surface 25 are formed on the inner periphery of the outer cylinder 4 on the inlet side.

  The cap 6 is formed in a cap shape with a resin such as polyacetal having a higher tensile elastic modulus than that of the outer cylinder 4. On the inner peripheral side of the cap 6, an engagement step portion 27 that can be snap-fitted to the engagement step portion 23 of the outer cylinder 4 is formed. The cap 6 is attached to the opening side of the outer cylinder 4 by snap fitting of the engaging step portions 23 and 27, and after the attachment, the cap 6 and the outer cylinder 4 can rotate relative to each other. An annular protrusion 28 protruding in the inner circumferential direction is formed on the end side of the cap 6, and the lock ring 7 is prevented from coming out by the annular protrusion 28 after the outer cylinder 4 is mounted. The cap 6 can also be formed of a material having transparency.

  The lock ring 7 is formed in a substantially annular shape from stainless steel or the like, and has an annular portion 30 and a claw portion 31 on the inner diameter side of the annular portion 30. The claw portion 31 is bent from the annular portion 30 at a predetermined inclination angle and can be locked to the surface of the resin tube 2. The lock ring 7 is mounted in a gap 32 formed between the opening side of the outer cylinder 4 and the inner peripheral portion of the cap 6, and the claw portion 31 is configured to smoothly insert the resin tube 2 by the claw portion 31. The resin tube 2 is locked, and when a pulling load is applied to the resin tube 2, the resin tube 2 can be quickly connected in a pull-out preventing state by exhibiting a pull-in preventing force.

  The insertion guide 10 in FIG. 3 is provided to guide the resin pipe 2 in the pipe joint main body 1 and is attached to the gap G between the inner cylinder 3 and the outer cylinder 4. The insertion guide 10 is made of, for example, a hard resin such as polyacetal having elasticity, and a plurality of elastic tongue pieces 35 and tapered surface portions 36 are provided on the outer periphery thereof.

  The elastic tongue pieces 35 are formed at, for example, four intervals with respect to the insertion guide 10 and protrude outwardly from the outer peripheral portion of the insertion guide 10 so as to be bowed, and are larger than the inner diameter of the outer cylinder 4. It is set to a dimension that is the same as or slightly larger than the inner diameter of the concave housing portion 20 provided in the inner portion of the outer cylinder 4. A locking projection 38 is formed at the end of the elastic tongue piece 35, and the locking projection 38 can be locked to the inner diameter projection 21 provided at the starting end position of the concave storage portion 20. When the insertion guide 10 is pushed by the resin tube 2 to move in the back direction in the gap G and the locking projection 38 is locked to the inner diameter projection 21, elastic energy is stored in the elastic tongue piece 35. It is like that. The elastic tongue piece 35 has a size that can be stored in the concave storage portion 20. The tapered surface portion 36 is formed on the outer periphery near the rear end of the insertion guide 10 so as to be inclined at a predetermined angle from the insertion direction of the insertion guide 10.

  The insertion guide 10 has a mounting recess 40 formed on the outer periphery thereof by an elastic tongue piece 35, a tapered surface portion 36, and an outer peripheral portion 37 positioned therebetween. The insertion guide 10 is inserted into the lock ring 7 from the guide surface 41 side, which will be described later, so that the elastic tongue 35 is raised and returned after tilting, and the claw portion 31 of the lock ring 7 is fitted in the mounting recess 40. In addition, it is mounted between the lock ring 7 and the seal member 8 in a temporarily fixed state. By this temporary fixing, the insertion guide 10 is prevented from falling off the pipe joint body 1.

  When the insertion guide 10 is mounted, in FIG. 4, the insertion guide 10 and the lock ring 7 are temporarily assembled together while the claw portion 31 is fitted into the mounting recess 40, and the cap is shown as indicated by an arrow. 6 is attached so as to be inserted into the annular projection 28 side from the fitting side with the outer cylinder 4. Furthermore, the outer cylinder 4 is press-fitted into the cap 6 in this state via the engagement step portions 23 and 27 by snap fitting, thereby being incorporated into a so-called semi-assembly state as shown in FIG. In this state, a gap x greater than the plate thickness of the lock ring 7 is provided between the outer cylinder 4 and the annular protrusion 28. Thereby, the insertion guide 10 temporarily assembled with the lock ring 7 is arranged in a state in which it can move slightly in the axial direction. The elastic tongue piece 35 is not in contact with the tapered surface 25 of the outer cylinder 4.

With respect to this temporarily assembled state, as shown in FIG. 6, the joint main body 5 is press-fitted so as to snap-fit the engaging portions 14 and 22, and these are integrated. At this time, since the seal member 8 mounted on the joint body 5 is assembled while pushing the insertion guide 10 while making strong contact with the insertion guide 10, it is necessary to firmly support the insertion guide 10 with the lock ring 7.
Therefore, the insertion guide 10 is provided with a mounting recess 40 for fitting with the lock ring 7 described above. The insertion guide 10 can be inserted into the lock ring 7 from the guide surface 41 side with respect to the mounting recess 40, and the elastic tongue piece 35 is tilted during this insertion process, and is returned in the reverse direction. The omission is prevented.

  Specifically, it is locked to the mounting recess 40 formed by the end portion 35a of the elastic tongue 35 and the tapered surface portion 36 of the insertion guide 10 shown in FIGS. 8 (a), 8 (b), and 8 (c). When the claw portion 31 of the ring 7 is locked, the above-described one-way strong fitting can be performed. At this time, as a desirable relationship between the shape of the lock ring 7 and the mounting recess 40, as shown in FIG. 9, the depth D of the mounting recess 40 in the removal preventing direction is sufficiently large with respect to the thickness T of the lock ring 7, For example, the depth D is set to 2 to 3 times the plate thickness of the lock ring 7. If the depth D exceeds three times, the elastic tongue 35 may not be tilted sufficiently, and there is a possibility that the locking operation with the lock ring 7 or the movement of the insertion guide 10 during insertion of the resin tube 2 may be hindered. is there. Furthermore, it is important to make the angle θ between the lock ring 7 and the mounting recess 40 in the thickness direction smaller than 90 °. By doing so, even when an axial force is applied to the elastic tongue 35 with respect to the lock ring 7, the claw portion 31 is prevented from coming out of the mounting recess 40, and thus the lock ring 7 of the insertion guide 10 is prevented. The temporary assembly strength with respect to can be maintained strongly. When the angle θ is larger than 90 °, the lock ring 7 tends to slip and disengage from the elastic tongue 35 with respect to the same axial force.

And after these integration, it will be in the state of FIG. As described above, the lock ring 7 and the insertion guide 10 are preliminarily assembled and mounted from the inside of the cap 6, so that the movement of the insertion guide 10 toward the inside of the joint during assembly of the joint can be restricted. The ring 7, the insertion guide 10, and the seal member 8 can be arranged at appropriate positions.
More specifically, the claw portion 31 of the lock ring 7 inclined in the resin tube insertion direction is engaged with the elastic tongue piece 35 inclined in the resin tube insertion direction on the outer periphery of the insertion guide 10. The insertion guide 10 at the time of joint assembly can be supported by utilizing the wedge action of the temporary assembly of the lock ring 7, and “dynamic frictional force between the insertion guide and the seal member” <“temporary assembly between the insertion guide and the lock ring” Due to the relationship of “stopping force”, the temporarily assembled state can be maintained against the frictional force when pressing the seal member 8.

  Since the temporary assembly of the insertion guide 10 and the lock ring 7 is strengthened in this manner, the insertion guide 10 and the lock ring 7 in the temporarily assembled state can be assembled into the pipe joint body 1. For this reason, positioning is difficult due to excessive insertion of the insertion guide, for example, when the pipe fitting body is assembled first, and the insertion guide is inserted into the pipe fitting main body at a predetermined position. It becomes easy to attach the insertion guide 10 to the pipe joint main body 1. The insertion guide 10 is held at an appropriate position by the lock ring 7 and the seal member 8 supported on the side surface of the annular protrusion 28 of the cap 6.

  Furthermore, if the insertion guide 10 and the lock ring 7 are temporarily fixed according to the above-described positional relationship, the positional relationship between the insertion guide 10 and the seal member 8 can be changed. For example, when the resin tube 2 is not connected, the claw portion 31 of the lock ring 7 may be positioned so as to face the vicinity of the rear position on the tube insertion side of the seal member 8. It is also possible to mount with an increased number of lock rings 7, in which case the insertion guide is temporarily fixed to the lock ring 7 arranged on the most entrance side, and a spacer ring (not shown) or the like is attached from above. What is necessary is just to mount | wear with what attached another lock ring temporarily through the cap 6. Also in this case, the insertion guide 10 can be mounted at a predetermined position of the pipe joint main body as in the case where there is one lock ring.

  On the inner peripheral side of the insertion guide 10, an arcuate guide surface 41 for guiding the seal member 8 and a cylindrical pressure contact surface 42 are formed following the guide surface 41, and the guide surface is followed by the guide surface 42. An annular protrusion 43 is formed on the other end side of 41 so as to protrude toward the inner diameter side. The annular protrusion 43 is gently connected by an inclined surface portion 44 formed between the pressure contact surface 42 and the inner diameter of the annular protrusion 43 is substantially the same as the inner diameter of the resin tube 2 although not shown. It is set to a slightly smaller diameter. The inner diameter of the pressure contact surface 42 is smaller than the outer diameter of the seal member 8 and larger than the inner diameter of the resin tube 2. By making the inner diameter larger than the inner diameter of the annular protrusion 43, the pressure contact surface 42 The crushing allowance of the seal member 8 is set to be smaller than the crushing allowance by the annular protrusion 43. Therefore, the seal member 8 is gently inserted into the gap G without receiving a large load from the pressure contact surface 42. The inclined surface portion 44 of the insertion guide 10 may be either a tapered surface or a rounded surface.

The contact portion of the insertion guide 10 with the seal member 8 includes a guide surface 41 that first comes into contact with the seal member 8, a pressure contact surface 42 that presses the seal member 8, and an annular protrusion 43 that can be pressed more strongly than the pressure contact surface 42. It consists of three stages.
In the case of forming these surfaces of the guide surface 41, the pressure contact surface 42, and the annular projection 43, for example, the crushing margin of the seal member 8 is usually designed to be about 15% to 30%. In consideration of the dimensional tolerance at the time of manufacturing the seal member 8, it is desirable that the seal member 8 is formed with a predetermined dimension after setting a large crushing margin of about 30%.

  Here, when an insertion guide having a general shape is formed, in order to be able to insert the resin tube without damaging the O-ring in accordance with the standard for designing the O-ring, for example, It is necessary to provide a chamfer defined in JIS B 2401 or the like on the inner periphery of the tip. Therefore, originally, it is desirable to use the resin tube for insertion after chamfering the inner periphery of the tip after cutting the resin tube, but from the viewpoint of improving the work efficiency of the piping work site, It is usually difficult to make a smooth chamfer that satisfies the standard, and when a new bevel occurs in this chamfering process, the bevel is sandwiched between the seal surface and the seal member. It may be a factor that hinders sealing performance. For this reason, at work sites, in order to avoid the occurrence of whiskering and the like, the resin tube is cut with a dedicated cutter or the like, and the resin tube is used as it is for connection.

Therefore, in the present embodiment, the insertion guide 10 is provided in the above-described three-stage configuration, and is formed in a dimension that can exhibit a predetermined crushing allowance, thereby ensuring high sealing performance by the seal member 8. However, the resin pipe 2 can be easily inserted and connected. Thus, when the resin pipe 2 is inserted, the insertion guide 10 guides the resin pipe 2 in the gap G between the inner cylinder 3 and the outer cylinder 4 while pressing the seal member 8 in the inner diameter direction. It is possible to connect to.
When the insertion of the resin pipe 2 is completed, the pipe joint main body 1 generates sound and vibration by the elastic tongue piece 35 having an enlarged diameter colliding with the concave storage portion 20 of the outer cylinder 4 by its elastic force. ing.

Next, the operation when the resin pipe 2 is inserted into the pipe joint body 1 configured as described above will be described.
FIG. 10 shows a state where the insertion of the resin pipe 2 is started and the resin pipe end surface 2a comes into contact with the insertion guide 10 attached to the pipe joint body 1 in a temporarily fixed state. At this time, the seal member 8 on the inlet side is compressed by the pressure contact surface 42 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 8 and is automatically aligned with respect to the axis of the pipe joint, thereby preventing misalignment with the end surface 2a of the resin pipe 2.

  When the resin tube 2 is inserted from this state, the annular protrusion 43 presses the seal member 8 along with the insertion of the resin tube 2, so that the insertion guide 10 is strongly pressed against the end surface 2 a of the resin tube 2. Move to the inside. Further, when the resin pipe 2 is inserted into the pipe joint body 1, the back seal member 8 comes into contact with the guide surface 41 of the insertion guide 10. At this time, since the press contact surface 42 formed so as to follow the guide surface 41 gently is set so as to press the seal member 8 loosely, the seal member 8 is easily guided to the press contact surface 42.

  Subsequently, the elastic tongue piece 35 and the locking projection 38 come into contact with the tapered surface 25 of the outer cylinder 4, and along the R surface 26 formed following the tapered surface 25 as the resin tube 2 is inserted. These are stored in the gap G while being deformed. At this time, the insertion guide 10 continues to press into the seal member 8 and moves into the pipe joint body 1 to insert the resin pipe 2 up to the state shown in FIG.

  Then, as shown in FIG. 12, when the annular protrusion 43 comes into contact with the inner seal member 8, the insertion guide 10 is pressed by the end surface 2 a of the resin pipe 2 and moves into the pipe joint body 1. At this time, the elastic tongue 35 is reduced in diameter by the inner peripheral surface 4a of the outer cylinder 4, and elastic energy in the radial direction is stored, and the inner portion of the pipe joint body 1 is in a state of being strongly pressed against the inner peripheral surface 4a. In order to move in the direction, even if the pipe joint body 1 is arranged in a direction in which the resin pipe 2 is inserted in the direction of gravity, the insertion guide 10 gets over the seal ring 8 on the back side. It is prevented from falling off the resin pipe end face 2a due to gravity and falling to the back side of the pipe joint body 1.

  FIG. 13 shows a state where the resin tube 2 is further inserted and the locking convex portion 38 of the insertion guide 10 reaches the inner diameter convex portion 21 of the outer cylinder 4. At this time, the insertion guide 10 is further moved by locking at least one locking projection 38 of the four locking projections 38 to the inner diameter projection 21 of the outer cylinder 4. Be regulated. When the insertion of the resin tube 2 is continued from this state, the insertion guide 10 is pressed by the resin tube 2 and moves slightly in the insertion direction of the resin tube 2 while maintaining the above-mentioned locked state. As a result, the remaining locking protrusions 38 are locked to the inner diameter protrusion 21.

  If the insertion of the resin tube 2 is further continued in this engaged state, the operator tries to insert the resin tube 2 with a stronger force because the movement of the insertion guide 10 is restricted. At this time, the locking projection 38 is bent and deformed toward the center so as to get over the inner diameter projection 21, and the insertion guide 10 moves while elastic energy is stored in the elastic tongue 35. At this time, the insertion load slightly increases. It will be in the state.

  When the insertion is continued from this state and the locking projection 38 gets over the inner diameter projection 21, the insertion load is reduced at that moment, and each released locking projection 38 is expanded by the stored elastic energy. The diameter is restored and restored to the original state or a slightly reduced diameter state. At this time, vibration / sound is generated by the impact projection 38 colliding with the concave accommodating portion 20 in an impact manner. In this case, it suffices that at least sound is generated, and vibration is generated. At this time, the insertion guide 10 vigorously moves to the joint back side, so that the elastic tongue pieces 35 are expanded at the same time, and sound (vibration) can be effectively generated.

  In addition, since the internal diameter convex part 21 has the internal diameter smaller than the inner peripheral surface 4a of an outer cylinder, it has the function to further reduce the diameter of the elastic tongue piece 35 and to increase the elastic energy of radial direction. In a pipe joint that requires only this function, the engagement state of the locking convex portion 38 and the inner diameter convex portion 21 is not required, and the inner diameter convex portion 21 is inclined or curved from the inner peripheral surface 4a of the outer cylinder. And the elastic tongue piece 35 may be smoothly reduced in diameter.

  FIG. 14 shows a state where the insertion of the resin tube 2 is completed. At this time, the locking convex portion 38 is stored in the concave storage portion 20. In this case, when the insertion guide 10 reaches the depth of the joint, a distance L that allows the resin tube 2 to be obliquely cut between the position of the locking convex portion 38 of the elastic tongue 35 and the entrance 20a of the concave storage portion 20 is set. Therefore, even when an obliquely cut resin tube 50, which will be described later, is connected by this distance L, a shift in the length direction of the end surface 50a can be absorbed and the locking convex portion 38 can be securely stored in the concave storage portion 20. . Moreover, since the space L is formed between the locking projections 38 when the locking projections 38 collide with the concave storage portion 20 by providing the distance L, a collision sound by the locking projections 38 is generated by these space portions. It is possible to reverberate, and a collision sound (vibration) can be generated more greatly.

  FIG. 15 shows a state in which an obliquely cut resin pipe 50 whose end face 50a is not cut perpendicular to the pipe axis is inserted into the pipe joint main body 1. In the figure, the resin pipe 50 has a dimensional difference due to a deviation amount Δ in the pipe axis direction between the upper end face side and the lower end face side. When the resin pipe 50 is inserted into the pipe joint body 1, The lower end surface side is inserted in advance.

  However, at this time, since the annular protrusion 43 is caught by the seal member 8 and pressed against the seal member 8 at the lower end side, the resin tube 50 comes into contact with the insertion guide 10, and the insertion guide 10 is in contact with the resin tube 50. The pressed state is maintained. At this time, since the insertion guide 10 is deformed along the end surface 50a and maintained in the deformed state at the upper end surface side inserted with a delay of Δ, the insertion is performed in the same manner as the lower end surface side. A state in which the guide 10 is pressed by the resin pipe 50 is ensured.

  Even when the resin tube 50 is further pushed in, the state where the resin tube 50 is pressed against the insertion guide 10 is always maintained in the same manner as described above until the annular protrusion 43 completely gets over the seal member 8. The insertion guide 10 and the end surface 50a are prevented from separating. Accordingly, even when the obliquely cut resin tube 50 is inserted, the edge portion of the end surface 50a is prevented from coming into contact with the seal member 8 until the end surface 50a completely passes through the seal member 8. 8 is prevented from being sandwiched between the insertion guide 10 and the end surface 50a or from being damaged by the end surface 50a. After the resin pipe 50 is connected, the shift convex portion 38 is accommodated in the concave accommodating portion 20 by allowing the shift amount Δ by the distance L described above.

  On the other hand, when the deviation amount Δ is not within the allowable range, the locking convex portion 38 that does not reach the concave accommodating portion 20 is generated, and the generation of sound is insufficient, so that connection to the operator is insufficient. Can be recognized.

When an insertion guide without an annular protrusion, for example, an insertion guide with a straight inner periphery is used, the insertion guide is pressed against the seal member when inserting a resin tube that is obliquely cut. When trying to get over, the entire seal member is pressed in the insertion direction of the resin tube, so a gap is created between the insertion guide and the end surface of the resin tube on the side inserted late in the joint, The edge portion of the end face of the resin pipe is in direct contact with the seal member. At that time, since the sealing member has already entered the inner surface of the resin tube on the side of the resin tube inserted in advance, the sealing member is squeezed out of its mounting groove on the side of being inserted later, It becomes easy to get caught in the edge part of a resin pipe. Therefore, the seal member protrudes from between the inner cylinder and the resin tube or is damaged at the edge portion of the resin tube, leading to water leakage.
On the other hand, as described above, the pipe joint according to the present invention can keep the insertion guide 10 and the resin pipe end face in contact with each other by the annular protrusion 43, so that the mounting state of the seal member 8 in the mounting groove 12 is maintained. Thus, it is possible to reliably prevent water leakage.

  In the pipe joint of the present invention, as described above, the insertion guide 10 that guides the resin pipe 2 is mounted in the gap G between the inner cylinder 3 and the outer cylinder 4, and a plurality of elastic tongue pieces 35 are provided on the outer periphery of the insertion guide 10. The outer tongue 4 is set to have an outer diameter larger than the inner diameter of the outer cylinder 4, and a concave storage portion 20 for generating sound and vibration is formed in the inner diameter deep part of the outer cylinder 4 by the elastic tongue 35. Therefore, the resin guide 2 is guided by the insertion guide 10 without damaging the seal member 8 without newly adding parts other than the insertion guide 10 to the inside of the pipe joint body 1 or complicating the internal structure. The resin tube 2 can be securely inserted up to a predetermined position without sealing, and the sealing performance by the seal member 8 can be ensured. When the insertion of the resin tube 2 is completed, sound and vibration are generated, so that the sound at this time can be heard. , By perceiving vibration by touch You can confirm the completion easily.

  In addition, the latching convex portion 38 provided at the end of the elastic tongue piece 35 is latched to the inner diameter convex portion 21 provided at the starting end position of the concave storage portion 20 of the outer cylinder 4 to store the elastic energy of the elastic tongue piece. Therefore, the elastic energy stored can be increased by bending the elastic tongue 35 deeper, and the sound and vibration when the locking projection 38 collides with the concave storage portion 20 can be increased. Completion of insertion of the resin tube 2 can be detected reliably.

In FIG. 16, other embodiment of the pipe joint in 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.
The pipe joint body 60 in this embodiment has an insertion guide 61 and an annular click member 62 that is separate from the insertion guide 61, and the insertion guide 61 is mounted in the gap G between the inner cylinder 3 and the outer cylinder 4. The click member 62 is mounted on the joint back side with respect to the insertion guide 61. A plurality of elastic tongue pieces 35 are provided on the outer periphery of the click member 62, and the outer diameter of the elastic tongue pieces 35 is set to be larger than the inner diameter of the outer cylinder 4. A concave storage portion 20 for generating sound and vibration in the piece 35 is formed.

  The insertion guide 61 and the click member 62 are formed of, for example, hard resin such as polyacetal having elasticity, like the insertion guide 10 described above. When assembling the pipe joint main body 60, the click member 62 is mounted on the inner side of the joint in advance so that the elastic tongue 35 is locked to the locking recess 63 formed on the inner periphery of the outer cylinder 4. Subsequently, the insertion guide 61 is mounted.

In the case of the pipe joint body 60 as well, sound and vibration are generated when the elastic tongue 35 collides with the concave storage portion 20 when the insertion of the resin pipe 2 is completed, as in the above-described embodiment. Completion of connection of the tube 2 can be detected. Further, it is possible to see through the insertion state of the resin tube 2 from the outside of the outer cylinder 4.
As described above, the insertion guide 61 having a function of guiding the resin tube 2 and the click member 62 having a function of generating sound and vibration can be separately configured.

  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 retaining effect.

DESCRIPTION OF SYMBOLS 1 Pipe fitting main body 2 Resin pipe 3 Inner cylinder 3a Outer surface 4 Outer cylinder 5 Joint main body 7 Lock ring 8 Seal member 10 Insertion guide 20 Concave accommodation part 20a Entrance 21 Inner diameter convex part 35 Elastic tongue piece 38 Locking convex part G Gap L distance

Claims (5)

  This is a pipe joint in which a resin pipe inserted in a gap between an inner cylinder and an outer cylinder provided in a joint body is connected in a state of preventing pull-out by a lock ring and hermetically connected by a seal member attached to the outer peripheral surface of the inner cylinder. An insertion guide for guiding the resin tube is mounted between the inner and outer cylinders, an elastic tongue piece is provided on the outer periphery of the insertion guide, and the outer diameter of the elastic tongue piece is set larger than the inner diameter of the outer cylinder. A pipe joint characterized in that sound and vibration are generated when the elastic tongue piece is restored from the state where the diameter of the elastic tongue is reduced and the elastic energy in the radial direction is stored.   This is a pipe joint in which a resin pipe inserted in a gap between an inner cylinder and an outer cylinder provided in a joint body is connected in a state of preventing pull-out by a lock ring and hermetically connected by a seal member attached to the outer peripheral surface of the inner cylinder. An insertion guide for guiding the resin tube is mounted between the inner and outer cylinders, an elastic tongue piece is provided on the outer periphery of the insertion guide, and the outer diameter of the elastic tongue piece is set larger than the inner diameter of the outer cylinder. A pipe joint characterized in that a concave storage portion for generating sound and vibration with the elastic tongue piece is formed in the inner diameter back portion of the outer cylinder.   3. The insertion guide according to claim 1, wherein the insertion guide is mounted in a temporarily fixed state between a lock ring mounted on the opening side of the outer cylinder and the seal member provided at a position facing the lock ring. Pipe fittings. The pipe joint according to claim 2 , wherein a locking convex portion provided at an end portion of the elastic tongue piece is locked to an inner diameter convex portion provided at a starting end position of the concave storage portion of the outer cylinder. Claim 2 or 4 wherein the insertion guide is provided with a distance that allows the beveled resin pipe between the inlet position and the concave housing portion of the locking protrusion of the elastic tongue in a state that reaches deep into the joint The pipe joint described in 1.

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