JP2007198585A - Easy release joint for resin tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easy release joint providing smooth insertion and connection without damaging a component such as a seal member in insertion of a joining pipe, enabling smooth passage of a guide ring through the seal member, stably securing a squeeze of the seal member for a long period of time by suppressing stress relaxation of the pipe due to a fluid pressure, and exercising stable performance even in assemblability and working efficiency. <P>SOLUTION: A lock ring 17 and a cylindrical indicator 20 are housed in a joint body 10. The cylindrical indicator 20 is formed integrally with an outer cylinder part 22 having an insertion gap part 24 for inserting the joining pipe 50 from a deep part 21a of an inner cylinder part 21. An inner circumferential seal member 29 is attached to an attachment groove 21b, and an outer circumferential seal member 30 is attached to an attachment part 23. The guide ring 40 is inserted in the insertion gap part 24 to press the outer circumferential seal member 30 against an outer circumferential face 40a, and to press an inner circumferential face 40b against the inner circumferential seal member 29. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a one-touch joint for resin pipes that can connect, for example, a resin pipe such as a crosslinked polyethylene pipe or a polybutene pipe to a pipe for water supply or hot water supply in a residential facility.

The joint structures for connecting this type of pipe can be roughly classified into five types: one-touch joints, electric fusion joints, heat fusion joints, cap nut joints, and slide ring joints.
Among them, a joint called a one-touch joint is widely used because it is easy to connect the pipe and the joint and can be constructed in a short time.

  This one-touch joint can be divided into an outer peripheral O-ring method (hereinafter referred to as “outer peripheral type”) and an inner peripheral O-ring seal method (hereinafter referred to as “inner peripheral type”). The former outer peripheral type is a structure in which a sealing O-ring in the joint is arranged at the outer diameter portion of the pipe after the pipe is inserted. This outer peripheral type has a simpler basic structure and better flow characteristics than the inner peripheral type, but handling of the pipe is rough during piping construction, or a line is applied to the outer peripheral surface of the pipe with a cutter during piping work. When scratched, the outer peripheral O-ring alone has a drawback that a sufficient sealing effect cannot be obtained and water leakage occurs.

  On the other hand, the inner peripheral type has a more basic structure than the outer peripheral type and the flow characteristics are slightly inferior to the outer peripheral type, but it is not affected at all by the scratches on the outer surface of the pipe and is reliable in terms of sealing performance. Highly reliable and trusted by users. This inner circumference type is a structure in which the O-ring for sealing in the joint is arranged on the inner diameter part of the pipe after inserting the pipe. Therefore, in the case of the inner circumference type, in order to obtain an appropriate crushing margin of the inner circumference O-ring, As shown below, an inner circumference type joint with various devices has been proposed.

  One of them is a type that incorporates an O-ring with a thin wire diameter, and the tube can be inserted into the joint as it is. In this case, it is not possible to earn an appropriate crushing cost simply by inserting the tube. This type of joint is forcibly clamped from the outer diameter side to obtain an appropriate crushing margin (see Patent Document 1).

  Other joints use thick O-rings or special packing (triangular cross-section packing), so that the proper crushing allowance can be obtained without clamping from the tube outer diameter after tube insertion. Since the pipe insertion force becomes high, the insertion guide has a part provided in the joint. In this case, if there is no insertion guide, not only the tube insertion force is high, but also the inner peripheral O-ring is cut or caught, so the inner peripheral O-ring is fixed to the mounting groove of the inner cylinder with an adhesive. (See Patent Document 2 and Patent Document 3).

Further, other types of joints have been proposed in which another part incorporating the inner peripheral O-ring is inserted into the pipe in the manner of incorporating the in-core before being inserted into the joint body before the pipe is inserted into the joint. (See Patent Document 4).
Japanese Patent No. 3411546 Japanese Patent No. 3600764 Japanese Patent Laid-Open No. 2004-232692 JP 2003-240177 A

  However, since Patent Document 1 cannot obtain a proper crushing cost simply by inserting a tube, it is forcibly clamped with a clamp member from the outer diameter of the tube after inserting the tube, so that a crushing margin is obtained. The structure was complicated.

  In Patent Document 2, since the guide itself is very thin, it is difficult to manufacture, the strength is low, the insertion guide is difficult to fix, and the assembly work is also difficult. Further, in Patent Document 3, since the movement of the resin guide is limited by the barrel, the ability to cope with the oblique cutting of the tube is low. For example, when a tube obliquely cut at an angle of 10 degrees is inserted, the insertion guide end face A gap is formed between the pipe end surface and the inner peripheral O-ring, and the O-ring pops out or cuts. Therefore, it is necessary to fix the inner peripheral O-ring with an adhesive or the like.

  Furthermore, Patent Document 4 has a complicated structure and requires expensive parts, and this structure may malfunction due to a product drop or the like, making it impossible to use.

  The present invention has been developed in order to solve the conventional problems, and the object of the present invention is to enable smooth insertion and connection without damaging the seal member or the like when inserting the joining pipe. The guide ring can smoothly pass through the seal member without creating a gap between the pipe and the guide ring, and the stress relief of the pipe due to fluid pressure is suppressed, so that the crushing cost of the seal member is long-term In addition, it is to provide a useful one-touch joint that exhibits stable performance in assembly and workability.

  In order to achieve the above object, according to the first aspect of the present invention, a mounting groove is formed in the outer peripheral surface of the inner cylinder part provided integrally or separately in the joint body, and the inner peripheral sealing member is mounted in the mounting groove. Then, a guide ring formed of an elastic material such as rubber is externally fitted to the inner cylindrical portion, and the inner peripheral sealing member is pressed and contacted with the inner peripheral surface of the guide ring, and the joint pipe is fitted to the inner cylindrical portion. This is a one-touch joint for resin pipes in which the joining pipe is properly inserted and connected while pressing and guiding the rear end face of the guide ring with the front end face.

  The invention according to claim 2 is the one-touch joint for resin pipes in which the front end portion of the joining pipe inserts and connects the joining pipe while following the elasticity of the rear end face of the rubber guide ring.

  According to a third aspect of the present invention, a cylindrical indicator having a lock ring and an inner cylindrical portion is accommodated in the joint body, and the cylindrical indicator has an insertion gap portion for inserting the joining pipe from the inner portion of the inner cylindrical portion. The outer cylinder part is integrally formed, the inner peripheral seal member is attached to the attachment groove formed in the inner cylinder part, the outer peripheral seal member is attached to the attachment part formed in the outer cylinder part, and an elastic material such as rubber is used. A resin pipe one-touch joint that inserts the formed guide ring into the insertion gap and presses the outer peripheral surface of the guide ring with the outer peripheral seal member to press the inner peripheral seal member and the inner cylindrical portion with the inner peripheral surface of the guide ring. is there.

  The invention according to claim 5 is a resin in which the outer peripheral surface of the guide ring is formed into a tapered surface, and the tapered peripheral surface is pressed by the outer peripheral seal member to bring the inner peripheral surface of the guide ring into surface contact with the outer peripheral surface of the inner cylindrical portion. One-touch joint for pipes.

  The invention which concerns on Claim 6 is the one-touch coupling for resin pipes which formed the outer periphery of the storage chamber formed in the back | inner part of the insertion gap part in the taper surface.

  The invention according to claim 7 is the one-touch joint for resin pipes in which the front end surface of the joining pipe inserted into the insertion gap is pressed and brought into contact with the elasticity of the rear end surface of the guide ring.

  In the invention according to claim 8, when the guide ring is pressed by the joining pipe inserted into the insertion gap portion and the guide ring is guided to the storage chamber at the back of the insertion gap portion, the outer peripheral surface of the joining pipe and the outer cylinder portion The outer peripheral seal member in the mounting portion is pressed and moved to the opening side of the joint body by compressed air communicated through a clearance provided between the inner peripheral surface and the inner peripheral surface of the joint pipe. It is a one-touch joint for resin pipes that is pressure-held.

The invention according to claim 9 is the one-touch joint for resin pipes in which a step groove portion for preventing the guide ring from slipping out is formed on the inner peripheral surface of the storage chamber.

  In the invention according to claim 10, the joint body is formed by screwing the joint portion and the covering cylinder, a viewing window is formed in the covering cylinder, and the cylindrical indicator is formed of a transparent or translucent resin. This is a one-touch joint for resin pipes that allows the connection state of the joint pipe to be confirmed from the outside.

According to the invention according to claim 1, the guide ring can smoothly and surely guide and insert the joining pipe while ensuring an appropriate crushing margin for the inner peripheral sealing member, and can exhibit stable pipe insertion performance. Therefore, a useful inner seal type one-touch joint can be obtained.

  According to the second aspect of the present invention, even when a joining pipe whose tip end face is obliquely cut is inserted, the tip end face of the joining pipe having the oblique cutting angle is inserted and connected while following the guide ring of an elastic material such as rubber. Therefore, the joint pipe and the joint can be reliably and easily connected without causing damage to the inner peripheral seal member or the like.

  According to the invention of claim 3, when the pipe is inserted, the outer peripheral surface of the guide ring can be pressed by the outer peripheral seal member, and the rear end surface of the guide ring formed of an elastic material and the front end surface of the joining pipe Can be inserted while firmly contacting, so there is no gap between the tip of the pipe and the guide ring, the guide ring can smoothly pass through the inner peripheral seal member, and the joined pipe can be securely connected Can do.

  According to the invention according to claim 4, since the guide ring is stably positioned and held by the outer peripheral seal member, it is possible to prevent the appearance defect, the deformation of the guide ring and the lock ring, and the insertion force of the joining pipe. It is possible to stabilize and prevent breakage of the guide ring during insertion, and further contribute to simplification of assembly and inspection.

  According to the fifth aspect of the present invention, the guide ring presses the inner peripheral surface of the guide ring while firmly pressing the tapered surface of the outer periphery of the guide ring with the outer peripheral sealing member, and the pipe tip surface is firmly adhered to the bonded pipe. It can be connected in a stable state.

  According to the invention according to claim 6, since the outer periphery of the storage chamber formed in the back of the insertion gap is formed in a tapered surface, the guide ring can be smoothly connected while reliably guiding the joining pipe, Moreover, the function of complementing the sealing performance of the inner peripheral sealing member is also exhibited.

  According to the invention according to claim 7, since the tip surface of the joined pipe inserted into the insertion gap is pressed and contacted while following the elasticity of the rear end surface of the guide ring, even if the pipe tip surface is obliquely cut, It is possible to connect in a stable state by reliably pressing and contacting without a gap between the rear end surface of the guide ring.

  According to the invention according to claim 8, the cylindrical indicator uses an integral part, and before the pipe is inserted, the inner and outer seal members are slightly displaced with respect to the joined pipe and are not positioned in the sandwich state. It can be easily inserted while preventing the pipe insertion force from increasing. On the other hand, when the pipe is inserted, immediately after the pipe passes through the inner peripheral seal member and the outer peripheral seal member, the inside of the cylindrical indicator is sealed, and the compressed air flows between the inner peripheral surface of the outer cylindrical portion and the outer periphery of the joined pipe. When the outer peripheral seal member is moved to the opening side of the joint body by passing through the clearance between the surface and pressing the outer peripheral seal member in the mounting portion, the inner and outer periphery of the joint pipe is moved between the inner peripheral seal member and the outer peripheral seal member. Because sandwiched state is maintained, the phenomenon that the joint pipe expands due to stress relaxation due to fluid pressure load can be suppressed, and the crushing allowance of the inner peripheral seal member can be secured stably over the long term. In addition, it is not necessary to use a special member for clamping as in the conventional example, and the connecting operation can be performed reliably and easily.

  According to the ninth aspect of the invention, since the outer peripheral surface of the guide ring located in the storage chamber is in contact with the stepped groove formed on the inner peripheral surface of the storage chamber, the phenomenon of the guide ring coming back is reliably prevented. be able to.

  According to the invention which concerns on Claim 10, since the connection state of the joining pipe in a joint can be confirmed from the outside, a connection state can be visually recognized, it becomes possible to confirm a connection failure beforehand, and the situation of a connection failure is avoided. be able to.

Hereinafter, embodiments of a one-touch joint for resin pipes according to the present invention will be described in detail with reference to the drawings.
In FIG. 1, the one-touch joint for resin pipes of the present invention is used as, for example, a pipe joint for joining pipes for water supply and hot water supply, and this one-touch joint joins a resin pipe such as a crosslinked polyethylene pipe or a polybutene pipe to a joint pipe 50. It is a pipe joint that can be connected as
In the figure, the joint body 10 is composed of a joint part 11 and a covered cylinder 12, and can be integrated by screwing a male screw 11 a provided on the joint part 11 and a screw 12 a provided on the covered cylinder 12. . The attachment structure of the joint part 11 and the covering cylinder 12 is not limited to the attachment by a so-called cap structure in which a female screw 12a is screwed over the male screw 11a. And these may be attached by screwing.

  As shown in FIG. 2, the joint portion 11 is formed in a substantially cylindrical shape with a metal such as brass or bronze, and a header or a connecting member (not shown) Or the external thread part 11b (or female thread or other connection part) connected with another piping is provided. The joint portion 11 may be formed in, for example, a cheese shape or an elbow shape in addition to the normal linear shape as shown in the figure, and the joint portion may be incorporated into a part of a valve not shown in the figure. Thus, it is used as a joint part of various forms of piping, and can be applied to joint parts having forms having various structures and shapes.

  The covering cylinder 12 is formed in a substantially cylindrical shape from a metal such as brass or bronze, and when the joint portion 11 is screwed to form the joint body 10, the lock ring 17 and the cylindrical indicator 20 are formed inside the covering cylinder 12. And a holding ring 31, a seal ring 28, an inner peripheral seal member (O-ring) 29, an outer peripheral seal member (O-ring) 30, a guide ring 40, and a spacer ring 36 are accommodated. The joint portion 11 and the covering cylinder 12 may be made of resin.

A confirmation window 13 is formed on the outside of the covering cylinder 12 so that the state of the inside of the cylindrical indicator 20 can be confirmed from the confirmation window 13, and the joining pipe 50 is provided in the insertion opening 14 provided in the covering cylinder 12. The jointed state of the joining pipe 50 (the state where the insertion is completed) can be confirmed from the outside when inserted from the outside.
A stepped portion 15 is provided on the inner peripheral side of the covering cylinder 12, and a lock ring 17 is provided on the stepped portion 15 so as to be attachable. Further, an engagement step portion 16 is formed at a position on the insertion direction side from the step portion 15, and a holding ring 31 can be attached to the engagement step portion 16.

  The outer peripheral cylinder of the coated cylinder 12 is printed on the transparent film for shrink-wrapping the material of the joining pipe and other characters and graphics in advance on the film, and then shrink-wrapped on the coated cylinder 12 of the corresponding joint. You can also. The shrink wrap also has a function of protecting the indicator 20 exposed to the outside through the confirmation window 13.

  The cylindrical indicator 20 is provided with an inner cylindrical portion 21 on the inner side, and an outer cylindrical portion 22 having an insertion gap portion 24 into which the joining pipe 50 is inserted from the inner portion 21a of the inner cylindrical portion 21 is integrally formed. It is formed in a heavy cylinder shape. The cylindrical indicator 20 is formed of a transparent or translucent resin such as polyphenylsulfone (PPSU), and is provided so that the inside of the fluoroscopic cylinder can be viewed from the outside. Further, it is desirable that this material has pressure resistance, cold resistance, hydrolysis resistance, chlorine resistance, impact resistance, chemical resistance, and long-term hot internal pressure creep resistance.

A groove-shaped mounting groove 21b is provided on the outer peripheral side of the inner cylinder portion 21, and an inner peripheral seal member 29 made of an inner peripheral O-ring in this example is mounted in the mounting groove 21b.
In this embodiment, the cylindrical indicator 20 is divided into a first member 20a and a second member 20b, and these are integrated by snap fitting so that the first member 20a and the second member 20b are integrated. The mounting groove 21b is provided between them, but in addition to this, the first member and the second member may be fixed by means such as screwing, adhesion, fusion, press-fit (fitting), or Alternatively, the entire cylindrical indicator may be formed by molding means such as injection molding, and the mounting groove 21b may be provided in the cylindrical indicator 20 in advance.

In addition, the 1st member 20a and the 2nd member 20b in a present Example are being fixed in the non-rotating state by the uneven | corrugated fitting by the concave-line part 20c and the convex part 20d respectively formed in the axial direction.
Moreover, although the cylindrical indicator 20 in a present Example is comprised as a single component which integrally molded the inner cylinder part 21 and the outer cylinder part 22, the inner cylinder part 21 and the outer cylinder part 22 are made into a different body. You may comprise so that it may integrate substantially by arrange | positioning both components in a sealing state via an O-ring etc., shape | molding.
In addition, the inner cylinder part may be provided integrally with the joint part 11. In this case, it is possible to easily form the joint portion 11 with a simple configuration by integrating the joint portion and the inner cylinder portion, and it is possible to ensure fluid leakage without mounting a seal ring 28 described later between them. It is prevented.

The mounting groove 21b can be reduced in depth by forming the inner diameter of the inner peripheral O-ring 29 to be small, and thereby the flow rate can be increased so as to increase the diameter of the flow path in the inner cylinder portion 21. Largely secured.
Moreover, the outer peripheral surface 21c of the inner cylinder part 21 is formed in the substantially flat surface shape, and this outer peripheral surface 21c is provided in the diameter which can insert smoothly while the guide ring 40 is closely_contact | adhered.

A storage chamber 25 in which the guide ring 40 can be stored is provided at the back of the insertion gap 24, and an inner peripheral surface 25a of the storage chamber 25 is formed in a tapered surface. As will be described later, the inner peripheral surface 25a is formed at the same angle as the outer peripheral surface 40a provided on the guide ring 40, whereby the guide ring 40 is smoothly guided into the tapered inner peripheral surface 25a.
Further, as shown in FIG. 13, a step groove portion 25 b for preventing the guide ring 40 from slipping back is formed on the inner peripheral surface 25 a of the storage chamber 25, and the outer periphery of the guide ring 40 stored in the storage chamber 25. The surface abuts and engages with the stepped groove portion 25b, and the guide ring 40 can be reliably prevented from coming back.

An annular step portion 22a is formed on the inner peripheral side of the outer cylindrical portion 22, and the holding ring 31 is positioned on the end portion side of the step portion 22a, thereby forming a groove-shaped mounting portion 23. Yes.
An annular protrusion 31 a into which the outer peripheral side of the joining pipe 50 is fitted is provided on the inner side of the holding ring 31, and a fitting surface 31 b that can be fitted on the inner peripheral surface side of the covering cylinder 12 is provided on the outer side. . Further, an engaging portion 31 c that can be engaged with the engaging step portion 16 of the covering cylinder 12 is provided on the fitting surface 31 b.
The contact surface portion 31d is provided on the end portion side of the holding ring 31. When the contact surface portion 31d is mounted in contact with the end portion 22b of the cylindrical indicator 20, the contact surface portion 31d and the cylindrical indicator 20 are disposed. The mounting portion 23 described above is formed between the step portion 22a, and an outer peripheral seal member 30 that is an outer peripheral O-ring is mounted on the mounting portion 23.
In this case, the annular protrusion 31a of the holding ring 31 may be slightly engaged with the rear outer end of the guide ring 40 described later, thereby preventing the guide ring 40 from popping out. In addition, when the annular protrusion 31a of the holding ring 31 and the guide ring 40 are brought into close contact with each other, it is possible to prevent intrusion of dust, moisture, and the like into the joint.

Since the length of the mounting portion 23 in the mounting direction is larger than the sectional diameter of the outer peripheral O-ring 30 (not shown), the outer peripheral O-ring 30 is movable between the mounting portions 23.
The starting position of the mounting portion 23 in the insertion direction is that the center position (not shown) in the mounting direction of the outer peripheral O-ring 30 is the center position in the mounting direction of the inner peripheral O-ring 29 when the outer peripheral O-ring 30 is mounted. On the other hand, when the outer peripheral O-ring 30 slides to the insertion side of the joining pipe 50, the center position of the outer peripheral O-ring 30 is the inner peripheral O-ring. The entire mounting portion 23 is configured to be substantially the same position as the center position of 29.

  Here, the state in which the center position of the outer peripheral O-ring 30 is substantially the same position as the center position of the inner peripheral O-ring 29 means that the joint pipe 50 expands to the outer peripheral side as the stress is relaxed by the load of fluid pressure. This is a state in which the inner peripheral seal by the inner peripheral O-ring 29 can be maintained by suppressing the phenomenon of diameter by the pressing force of the outer peripheral O-ring 30.

  The diameter of the flat inner peripheral surface 25b continuing from the inner peripheral surface 25a of the outer cylinder part 22 is such that a clearance 33 can be provided between the outer peripheral surface 50a of the joined pipe 50 when the joined pipe 50 is inserted. The outer diameter 50a of the joining pipe 50 is formed to be slightly larger than the outer diameter.

A flange 26 is formed on the end of the tubular indicator 20 attached to the joint 11, and when the tubular indicator 20 is attached to the joint 11, the outer peripheral surface 26 a side of the flange 26 is the side of the joint 11. By fitting to the guide surface 11c, backlash at the time of mounting is prevented, and the sealing performance by the O-ring 28 is ensured.
An annular notch 27 is provided in the vicinity of the flange 26, and a seal ring 28, which is an O-ring, is attached to the annular notch 27 to seal between the tubular indicator 20 and the joint part 11. With the seal ring 28 and the above-described play prevention structure, the gap between the joint portion 11 and the cylindrical indicator 20 is closed, and fluid leakage is reliably prevented.

  When attaching the joint part 11 and the covering cylinder 12, the end portion side of the covering cylinder 12 is in contact with the contact portion of the joint part so that the covering cylinder 12 cannot be screwed into the joint part 11 more than necessary. A large tightening force is not applied to the cylindrical indicator 20 mounted inside.

The inner periphery O-ring 29 and the outer periphery O-ring 30 are formed of an elastic material and are deformable. In this example, these are formed of rubber such as EPDM, but it is desirable that these have a hardness (durometer A) H _{A of} about 70, for example. _A 70 or more or the following materials may be used.

The guide ring 40 is formed of an elastic material having a hardness equal to or higher than that of the inner peripheral O-ring 29 and the outer peripheral O-ring 30. For example, the guide ring 40 is NBR or compressed like the inner peripheral O-ring 29 and the outer peripheral O-ring 30. It is made of an elastic material such as rubber such as EPDM with little permanent set. In this case, a material having the same hardness as the rubber in this example, for example, a thermoplastic elastomer can be used.
The outer peripheral surface 40a of the guide ring 40 is formed in a tapered shape to provide a tapered surface, and the angle of the outer peripheral surface 40a is substantially the same as the angle of the inner peripheral surface 25a of the storage chamber 25.

As shown in FIGS. 11 and 12, an engaging convex portion 40 c is formed on the distal end side of the outer peripheral surface 40 a of the guide ring 40, and the outer peripheral O-ring 30 is engaged with the engaging convex portion 40 c to The surface 40a is pressed and held. The engaging portion 40 c in this example forms an annular ridge on the outer peripheral surface 40 a of the guide ring 40.
By preventing the guide ring 40 from jumping out to the lock ring side by the engaging convex portion 40c, the guide ring 40 is stably positioned and held by the outer peripheral O-ring 30, so that a stable pipe insertion function is exhibited. In addition, the guide ring 40 and the lock ring 17 are not deformed, and the assembly and inspection can be simplified.
As shown by a chain line in FIG. 12, an annular engaging convex portion 40d or engaging concave portion 40e is provided on the inner peripheral surface 40b of the guide ring 40, and the inner peripheral O-ring 29 is connected to the engaging convex portion 40d or the engaging convex portion. The guide ring 40 may be positioned by engaging with the mating recess 40e. Thus, by positioning and holding the guide ring with the O-ring, the guide ring can be held without increasing the number of parts and without damaging the guide ring. The engagement by the outer peripheral O-ring 30 having a larger diameter than the inner peripheral O-ring 29 has a large contact area and a strong locking force. Further, since the outer peripheral O-ring is movable along the tapered surface of the guide ring, the resistance when the guide ring is inserted can be reduced. Therefore, the position holding by the outer peripheral O-ring is preferable.

  The guide ring 40 is inserted from the insertion gap portion 24. When the guide ring 40 is inserted, the guide ring 40 is inserted so that the front end surface 51 of the joining pipe 50 abuts the rear end surface 41 of the guide ring 40. The joint pipe 50 moves in the pressing direction. At this time, a force acts on the outer peripheral surface 40a by pressing the outer peripheral surface (tapered surface) 40a of the guide ring 40 with the outer peripheral O-ring 30 attached to the cylindrical indicator 20, and a so-called wedge effect is exhibited. Due to this wedge effect, a force is applied to the guide ring 40 from the outer peripheral side to the inner peripheral side, and accordingly, a force is applied in the direction of pressing the inner peripheral O-ring 29 by the inner peripheral surface 40b of the guide ring 40.

  Thereby, even when it is a case where it is a case where it is a case where it is going to press this joining pipe 50 in the state where a part of tip end face 51 of joining pipe 50 contacted to guide ring 40, this part contact is maintained by the wedge effect. The guide ring 40 can be pressed in the insertion direction, and the guide ring 40 is formed of an elastic material, so that the rear end surface 41 of the guide ring 40 is elastically deformed along the shape with respect to the front end surface 51 of the joining pipe 50. The joining pipe 50 and the guide ring 40 can be moved in the insertion direction while being in surface contact.

The guide ring 40 and the joining pipe 50 slide while the inner peripheral side is in pressure contact with the outer peripheral surface 21c of the inner cylinder portion 21 due to the wedge effect, and the leading end face 51 of the joining pipe 50 and the rear end face 41 of the guide ring 40 are The joint pipe 50 can be inserted without causing a gap by tightly sealing. Accordingly, the inner circumferential O-ring 28 does not enter between the guide ring 40 and the joining pipe 50, and the joining pipe 50 can be smoothly slid while preventing the inner circumferential O-ring 28 from being displaced or falling off. it can.
As described above, when the joint pipe 50 is inserted, the joint pipe 50 can be properly inserted and connected to the inner peripheral ring 29, and the joint body 10 can be used in a state where the sealing performance by the inner peripheral O-ring 29 is reliably exhibited. It is possible to reliably join the joining pipe 50 to each other.

Further, even when the end portion (tip surface) 51 of the joining pipe 50 is cut in a so-called oblique cut state, the guide ring 40 is formed of an elastic material, so that the guide ring 40 is made of the joining pipe. The joint pipe can be inserted by being deformed so as to be in close contact with the tapered surface of the end portion, and deformed so as to follow elasticity with respect to the angle of oblique cutting. As the angle of oblique cutting of the joining pipe, for example, if the hardness is such that it can cope (deformable) even when it is cut by tilting about 15 degrees from the vertical direction, it can sufficiently cope with joining work in the field.
Further, since the guide ring 40 is formed by using an elastic material, it can operate smoothly without damaging other members at the time of insertion, and the joining pipe 50 and the joint body 10 can be reliably and easily joined. Become.
When setting the hardness of the guide ring 40, it is necessary to set it to an appropriate hardness in consideration of the above. For example, when the hardness of the O-rings 29 and 30 (about H _A 70) is set and the moldability of the guide ring 40 is taken into consideration, the setting is set to about H _A 90 or less.

  In the present embodiment, the outer peripheral surface 40a of the guide ring 40 is formed as a tapered surface. However, the outer peripheral surface 40a can be provided in a flat surface shape in the same manner as the inner peripheral surface side. Also in this case, as in the case where the tapered pipe is provided, the joined pipe 50 is securely sealed with the front end face 51 of the joined pipe 50 and the rear end face 41 of the guide ring, and the attached state of the inner peripheral O-ring 29 is correctly maintained. 50 can be joined.

  Since the storage chamber 25 in which the guide ring 40 is guided is integrally formed by the inner cylinder portion 21 and the outer cylinder portion 22, when the guide ring 40 is pressed and guided to the storage chamber 25 by the joining pipe 50, the storage chamber 25 is guided. As the guide ring 40 is inserted, the air in the sealed region sandwiched between the joining pipe 50, the outer ring 30 and the storage chamber 25 is compressed. The compressed air has no escape space because the storage chamber 25 is a sealed space, and this compressed air interferes when the joining pipe 50 is inserted until the guide ring 40 hits the back of the storage chamber 25. There is a possibility that the joining pipe 50 cannot be inserted.

  In order to prevent this, when the joining pipe 50 is inserted, immediately after the joining pipe passes through the inner peripheral O-ring 29 and the outer peripheral O-ring 30, the inside of the insertion gap portion 24 is sealed, and the compressed air in this sealed state. Is moved from the storage chamber 25 through the guide ring 40 to the side of the mounting portion 23 that communicates with the clearance 33 formed between the outer peripheral surface 50a of the joining pipe 50 and the inner peripheral surface 25b of the outer cylindrical portion 22, Thus, the outer peripheral O-ring 30 mounted in the mounting portion 23 by this compressed air can be pressed and moved toward the opening of the joint body 10 by the volume of the joining pipe 50 inserted into the sealed region.

  When the outer peripheral O-ring 30 moves, the inner and outer seal members including the outer peripheral O-ring 30 and the inner peripheral O-ring 29 are sandwiched between the outer peripheral surface 50a and the inner peripheral surface 50b of the joining pipe 50 in a sandwich state. As a result, the outer peripheral surface 50a of the joining pipe 50 can be sealed by the inner peripheral O-ring 29 and the outer peripheral O-ring 30 to prevent leakage, and stress relaxation of the pipe due to the pressure generated in the joint body 10 is caused. The looseness of the circumferential ring 29 can be prevented, and the crushing allowance of the inner circumferential O-ring 29 can be maintained for a long period of time, and a stable sealing performance can be exhibited.

  Thus, after joining the joining pipe 50, the outer peripheral O-ring 30 can be disposed on a substantially concentric circle with the inner peripheral O-ring 29, and for example, to exert a sealing force as an O-ring as in the prior art. In addition, a member such as a clamping member for clamping is attached to the outer peripheral side of the cylindrical indicator 20, or attached to the joint pipe in advance using another part incorporating an inner peripheral O-ring before inserting the joint pipe into the joint body. There is no need to use a special member such as shave.

  Further, since the center position in the insertion direction of the outer peripheral seal ring 30 and the center position of the inner peripheral O-ring 29 are not shifted before the joining pipe 50 is inserted, the inner peripheral O-ring is not inserted when the joining pipe 50 is inserted. 29 and the outer peripheral O-ring 30 are not applied with a strong clamping force, and the insertion force required for inserting the joining pipe 50 is prevented from significantly increasing.

The outer periphery of the guide ring 40 may or may not be in contact with the inner periphery of the outer cylindrical portion 22 of the cylindrical indicator 20, but the contact point is the outer peripheral surface of the guide ring 40. Since it has an acute angle shape (lip shape) continuous with 40a, the lip portion tilts with the movement of the compressed air, and the compressed air can be moved to the mounting portion 23 side.
In the above embodiment, the guide ring 40 is pressed against the end face of the joint pipe 50 by pressing the outer peripheral surface 40a of the guide ring 40 with the outer peripheral O-ring 30, but the joint body 10 (cylindrical indicator) 20) and the joining pipe 50 are sealed only by the inner peripheral O-ring 29, the outer peripheral surface (tapered surface) 40a of the guide ring 40 is directly pressed by the outer cylindrical portion 22 of the indicator 20, or the outer peripheral O The ring 30 may be pressed by a non-sealable elastic member (not shown) such as a spring. Furthermore, in the above embodiment, the outer peripheral O-ring 30 is moved, but the inner peripheral O-ring 29 may also be moved.

The lock ring 17 is formed in a substantially annular shape from stainless steel or the like, and on the inner diameter side, a holding claw 17b that is locked to the surface side of the joint pipe and prevents the joint pipe from coming off is provided.
The ring portion 17a of the lock ring 17 may be inclined about 3 to 5 degrees with respect to the direction orthogonal to the central axis of the joint member 10, and in this example, it is inclined about 5 degrees toward the holding ring 30 side. Is bent. By inclining the ring portion 17a, the contact area with parts such as the joint member 10 in contact with the ring portion 17a is reduced, and the frictional resistance is reduced, so that the lock ring 17 is easily rotated. Further, after the joining pipe 50 is inserted, the joining pipe 50 and the lock ring 17 may be rotated together.

  The holding claw 17b of the lock ring 17 protrudes from the inner periphery of the ring portion 17a with a predetermined inclination angle (the initial bending angle of the lock ring 17 in this example is 45 degrees) from the ring portion 17a. By providing, the insertion of the joining pipe 50 is facilitated and the pulling prevention force of the joining pipe 50 is obtained. When the joining pipe 50 is pulled out, the holding claw 17b bites into the outer peripheral surface of the joining pipe 50 and restricts the retaining. Like to do. Further, the holding claw 17b is formed with a slit (not shown) and a concave portion at the center, and the concave portion is formed so that the entire holding claw 17b does not bite into the joining pipe 50 even if the holding claw 17b stands up. In addition, the biting portion is formed at two locations along both sides of the holding claw 17b. As described above, the lock ring 17 in this example does not have a portion for restricting the biting into the joining pipe 50 due to the shape of the lock ring main body.

  In addition, a biting portion (not shown) may be provided at the tip of each holding claw 17b, for example, at three or more locations. When the biting portions are provided at a plurality of locations in this way, each biting portion is formed thinly, When the joining pipe 50 is inserted, the contact surface pressure with the holding claw 17b is increased, and not only a relatively hard joining pipe 50 such as a cross-linked polyethylene pipe but also a relatively soft joining pipe 50 such as a polybutene pipe is bitten. It becomes easy. Further, by forming two or more pipe biting portions in one holding claw 17b, the number of points when the holding claw 17b holds the joining pipe 50 is increased, so that the joining pipe 50 can be reliably held. If the leading end of the biting portion has a small radius, the outer peripheral side may not be damaged when the joining pipe 50 is inserted.

Thus, by using the lock ring 17, the joining pipe 50 can be reliably held regardless of whether it is a crosslinked polyethylene pipe or a polybutene pipe. In general, a polyethylene pipe is a material that is relatively hard and easy to bite into the claw of the metal lock ring, while a polybutene pipe is relatively soft and elastic, and a claw having a low contact surface pressure with the joining pipe 50 is from the outer surface of the pipe. It is a material that escapes and the nail is difficult to bite, but the contact surface pressure of the nail against the tube is similar to the lock ring with the arc-shaped protrusion with a large radius at the center of the tip of each nail shown in the prior art. It can be securely held without being lowered, and there is no risk of biting into the polybutene tube, or when the pulling force is applied to the tube, the tube may come out of the joint.
In this example, two lock rings 17 having the same inclination angle of the ring portion 17a and the shape and inclination angle of the holding claw 17b are used, but locks having different specifications with different shapes, angles and the like are used. Two rings 17 may be used.

The spacer ring 36 is interposed between the lock rings 17 and 17, and the thickness of the spacer ring 36 is preferably 0.7 to 1.5 mm, for example. When the thickness of the spacer ring is 0.5 mm or less, the lock rings 17 and 17 when the joining pipe 50 is inserted have substantially the same behavior, and all the holding claws 17b stand up at one time, and the joining pipe easily breaks. Not desirable.
In this embodiment, the two lock rings 17 and the spacer ring 36 are used as members for holding the joining pipe 50. However, the present invention is not limited to this, and a known retaining ring or the like may be used.

Then, the case where the said one-touch coupling for resin pipes is integrated is demonstrated.
1 and 2, first, a seal ring 28 is attached to the annular notch 27 with respect to the cylindrical indicator 20 in which the inner peripheral O-ring 29 is attached to the attachment groove 21 b formed in the inner cylinder portion 21. The cylindrical indicator 20 and the joint part 11 are integrated so that 26 is fitted to the guide surface 11 c of the joint part 11. Next, the outer peripheral O-ring 30 is attached to the step portion 22 a from the opening side of the cylindrical indicator 20, and the tapered surface 40 a of the guide ring 40 is lightly sandwiched between the inner peripheral O-ring 29 and the outer peripheral O-ring 30. Wear from the tapered part.

  On the other hand, when the cover cylinder 12 is fitted with the two lock rings 17 and 17 with the spacer ring 36 interposed on the inner side, and further attached with the holding ring 31 from above, the engagement step portion 16 of the cover cylinder 12 is attached. The holding portion 31 of the holding ring 31 is engaged to hold the holding ring 31, the lock rings 17 and 17, and the spacer ring 36.

  In this state, the internal thread 12a of the covering cylinder 12 is screwed into the male thread 11a of the joint part 11 while bringing the end 22b of the cylindrical indicator 20 into contact with the contact surface part 31d of the holding ring 31. The joint main body 10 is configured by integration. The guide ring 40 can be incorporated into the integrated joint body, and the outer peripheral O-ring 30 presses the outer peripheral surface 40a of the guide ring 40 and is engaged and held by the engaging convex portion 40c to position the guide ring 40. Further, the guide ring 40 is slightly pressed against the side surface of the annular protrusion 31a of the holding ring 31 and temporarily fixed. Thereby, it can ship in the state which built the guide ring 40 previously, for example in the field, such as a factory.

Next, the effect | action in the said embodiment of the one-touch coupling for resin pipes of this invention is demonstrated.
3 to 6 show a case where the joining pipe 50 in which the front end surface 51 is accurately cut (cut along the vertical surface) is joined. When the joining pipe 50 is inserted from the insertion opening 14 side of the covering cylinder 12 as shown in FIG. 4 from the state of FIG. 3, the joining pipe 50 passes through the lock ring 17 while contacting the outer peripheral surface side. It fits into the annular protrusion 31 a of the holding ring 31, and then the front end surface 51 comes into contact with the rear end surface 41 of the guide ring 40. When the joining pipe 50 is to be inserted from this state, the guide ring 40 is pressed by the joining pipe 50.

At this time, by forming the outer peripheral surface 40a of the guide ring 40 into a tapered surface, as the pressing force is applied, the direction of the inner peripheral surface 40b of the guide ring 40 from the outer peripheral O-ring 30 through the outer peripheral surface 40a and the joining pipe 50 are increased. The force applied in the two directions of the front end surface 51 increases. Due to the wedge effect, the inner peripheral surface 40b of the guide ring 40 slides on the cylindrical indicator 20 while maintaining the sealing performance by making surface contact with the outer peripheral surface 21c of the inner cylindrical portion 21 of the cylindrical indicator 20. Since the joining pipe 50 is pressed from the axial direction against the guide ring 40 to which a force is applied in the inner cylinder direction, the front end surface 51 of the joining pipe 50 comes into surface contact with the rear end face 41 of the guide ring 40, They can be inserted with no gap between them.
When the joining pipe 50 is further inserted from this state, the insertion is continued in a state where the joining pipe 50 is sandwiched between the outer peripheral O-ring 30 and the inner peripheral O-ring 29 as shown in FIGS. Thereby, the insertion gap part 24 will be in the sealed state.

  When the tip surface 51 of the joining pipe 50 passes through the step portion 22a, the joining pipe 50 continues in a state where the clearance 33 is provided between the outer peripheral surface 50a of the joining pipe 50 and the inner peripheral surface 25b of the outer cylindrical portion 22. Inserted. This clearance 33 becomes a passage of compressed air that is compressed while being sandwiched between the guide ring 40 and the storage chamber 25 as the guide ring 40 faces the storage chamber 25, and the compressed air passes through the clearance 33 and escapes. The guide ring 40 can be smoothly slid, and thus the joining pipe 50 can be easily slid to the joining completion position.

Since the inner peripheral surface 25a of the storage chamber 25 is formed as a tapered surface having the same angle as the outer peripheral surface 40a of the guide ring 40, the inner peripheral surface 25a and the outer peripheral surface 40a are fitted so that they are in close surface contact. Thus, the compressed air in the storage chamber 25 can be surely released to the clearance 33 side, and when the joining is completed, the operator can confirm that the joining is completed by this fitting.
Further, since the step groove portion 25b is formed on the inner peripheral surface 25a, the guide ring 40 does not come off.

On the other hand, the compressed air that has passed through the clearance 33 tries to flow into the mounting portion 23 side. At this time, the outer peripheral O-ring 30 is compressed by providing the outer peripheral O-ring 30 to be movable in the mounting portion 23. It moves to the holding ring 31 side as shown in FIG.
In the present embodiment, the sealed area formed by the joining pipe 50, the outer peripheral O-ring 30 and the storage chamber 25 is formed in a state where the guide ring 40 is inserted, and the volume of the joining pipe 50 inserted into this sealed area. When the amount of air flows into the mounting portion 23, the outer peripheral O-ring 30 can be moved with an appropriate amount of movement. At this time, the outer peripheral O-ring 30 moves to a position substantially concentric with the inner peripheral O-ring 29. Therefore, the joining pipe 50 can be sandwiched by these inner and outer seal members 29 and 30 in a sandwich state from concentric directions.

Further, since the holding ring 31 is disposed at a position where the outer peripheral O-ring 30 finishes moving, the outer peripheral O-ring 30 comes into contact with the end surface of the holding ring 31 and stops when the movement ends. The ring 30 can be moved to an appropriate position.
In addition, after the joining pipe 50 is joined, the lock rings 17 and 17 can be reliably engaged with the outer peripheral surface 50a of the joining pipe 50, and the joining pipe 50 can be prevented from coming off.

  7 to 10, the case where the joining pipe 60 obtained by cutting the tip surface 61 by oblique cutting will be described. From the state of FIG. 7, as shown in FIG. 8, when the joining pipe 60 that is obliquely cut is inserted from the insertion opening 14 side of the covering cylinder 12, the joining pipe 60 first has the lock ring 17 on the outer peripheral surface 60a as described above. After passing through the contact ring, it fits into the annular protrusion 31 a of the holding ring 31, and then the obliquely cut front end surface 61 comes into contact with the rear end surface 41 of the guide ring 40.

  If the joint pipe 60 is further inserted from this state, the guide ring 40 has a wedge effect caused by pressing the outer peripheral O-ring 30 against the tapered surface 20a, and the direction of the inner peripheral surface 40b and the joint pipe 60 are reduced. A force is applied in two directions, that is, the direction of the tip surface 61. As a result, the guide ring 40 comes into contact with a part of the front end surface 61 of the joining pipe 60, and this portion, that is, the insertion force of the joining pipe 60, causes frictional forces between the guide ring 40, the outer periphery O-ring 30, and the inner periphery O-ring 29. As shown in FIG. 9, the entire surface of the annular rear end surface 41 of the guide ring 40 is obliquely cut from the front end surface of the joining pipe 60. The deformation is continued until it contacts the entire surface of 61.

In FIG. 9, since the entire front end surface 61 of the joining pipe 60 is in surface contact with the rear end surface 41 of the guide ring 40, there is no gap between them, and if further insertion is continued in this state, the front end surface is accurately cut. 9 to 10, the guide ring 40 moves to the storage chamber 25 while maintaining the surface contact between the rear end surface 41 of the guide ring 40 and the front end surface 61 of the joint pipe 60 as shown in FIGS. 9 to 10. Thus, the joining pipe 50 can be joined in an accurate state.
At this time, the outer peripheral O-ring 30 can be moved substantially concentrically with the inner peripheral O-ring 29 by compressed air in the same manner as described above, and the joint pipe 60 is sandwiched between these inner and outer seal members 29 and 30. By pressing, the same effect as described above is exhibited.

  In the above-described example, the cylindrical indicator 20 is configured as a resin product in which the inner cylinder portion 21 and the outer cylinder portion 22 are integrally molded, and the outer peripheral surface 21c of the inner cylinder portion 21 is substantially flat. However, it has a gently tapered surface shape that expands toward the accommodation chamber 25 of the inner cylinder portion 21 in accordance with the draft of the resin mold. Since the guide ring 40 in the present embodiment has elasticity capable of expanding the diameter, the diameter of the guide ring 40 can be increased while closely contacting the gently tapered surface of the outer peripheral surface 21c with the insertion of the joining pipe 60 into the joint. The joining pipe can be smoothly connected without excessively increasing the insertion resistance of the joining pipe.

Here, the influence which the positional relationship of the inner periphery O-ring 29 and the outer periphery O-ring 30 has on the force required for inserting the joining pipe into the joint is shown.
As shown in FIGS. 3 to 6, in the specimen A, the center position (not shown) in the mounting direction of the outer peripheral O-ring 30 is the center position in the mounting direction of the inner peripheral O-ring 29 before the joining pipe is inserted. The center position of the outer periphery O-ring 30 is set to be substantially the same position as the center position of the inner periphery O-ring 29 with the insertion of the joining pipe. Further, in the specimens B and C, the central position of the outer peripheral O-ring 30 is substantially the same as the central position of the inner peripheral O-ring 29 so that the O-ring arrangement of FIG. Was set to be.

Both samples have a nominal joint diameter of 13A, the inner peripheral O-ring 29 has a wire diameter of 1.5 mm to 2.0 mm, the outer peripheral O-ring 30 has a wire diameter of 3.0 mm to 4.0 mm, and the material of the O-ring Is EPDM.
The guide ring 40 is made of resin (material: polyethylene). For the insertion force of the joined pipe, the maximum load was measured using a compression test apparatus. The test results are shown in Table 1. In the table, “the center position distance between the inner and outer O-rings 29 and 30” refers to the distance between the center positions of the O-rings in the joint axial direction.

このように、供試品Ａのパイプ挿入力は、供試品Ｂ、Ｃよりも約４０％低いことが確認された。

As described above, it was confirmed that the pipe insertion force of the sample A was about 40% lower than that of the samples B and C.

  In addition, the above-described guide ring can be molded by resin, for example, in addition to rubber. In this case, the guide ring is bent in an accordion shape in about 20 divisions in the circumferential direction, and thus is directed toward the center direction. It has a spring property and can have an elastic force in the same manner as when molded with rubber. Thereby, the effect similar to the guide ring made from rubber | gum can be acquired using the resin molded product by injection molding cheaper than rubber | gum.

  In addition, as described above, the joining pipe connected to the one-touch joint for resin pipes in the present invention includes a crosslinked polyethylene pipe and a polybutene pipe. In addition to these, various resin pipes such as a metal reinforced polyethylene pipe, or copper Metal pipes such as pipes can also be joined.

It is the center sectional view showing the one-touch coupling for resin pipes in the present invention. FIG. 2 is an exploded perspective view of FIG. 1. It is the center sectional view showing the state before inserting a joined pipe in the one-touch joint for resin pipes of the present invention. FIG. 4 is a central sectional view showing a state at the start of insertion of the joined pipe of FIG. 3. FIG. 5 is a central sectional view showing a state during insertion of the joining pipe of FIG. 4. FIG. 6 is a central cross-sectional view showing a state after the joining pipe of FIG. 5 is inserted. It is the central sectional view showing the state before inserting the joining pipe of the diagonal cut into the one-touch joint for resin pipes of the present invention. FIG. 8 is a central sectional view showing a state at the start of insertion of the joined pipe of FIG. 7. FIG. 9 is a central cross-sectional view showing a state during insertion of the joining pipe of FIG. 8. FIG. 10 is a central cross-sectional view showing a state after the joining pipe of FIG. 9 is inserted. It is sectional drawing which showed the other example of the one-touch coupling for resin pipes in this invention. It is a partial expanded sectional view explanatory drawing of FIG. It is a partial expanded sectional view explanatory drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Joint main body 17 Lock ring 20 Cylindrical indicator 21 Inner cylinder part 21a Back part 21b Mounting groove 22 Outer cylinder part 23 Mounting part 24 Insertion gap part 25 Storage chamber 25a Inner peripheral surface 25b Step groove part 29 Inner circumference O-ring (inner seal) Element)
30 Outer peripheral O-ring (Outer peripheral seal member)
33 Clearance 40 Guide ring 40a Outer peripheral surface 40b Inner peripheral surface 40c Engaging convex portion 41 Rear end surface 50 Joining pipe 51 Front end surface

Claims (10)

  A mounting groove is formed on the outer peripheral surface of the inner cylindrical portion provided integrally or separately in the joint body, and an inner peripheral sealing member is mounted on the mounting groove. The inner cylindrical portion is made of an elastic material such as rubber. The formed guide ring is externally fitted, and the inner peripheral seal member is pressed and contacted by the inner peripheral surface of the guide ring, and the rear end surface of the guide ring is pressed by the front end surface of the joining pipe fitted to the inner cylindrical portion. One-touch joint for resin pipes, characterized in that the joining pipe is inserted and connected while guiding.   The one-touch joint for resin pipes according to claim 1, wherein the joining pipe is inserted and connected while the front end portion of the joining pipe follows the elasticity of the rear end face of the rubber guide ring.   A cylindrical indicator having a lock ring and an inner cylindrical portion is housed in the joint body, and this cylindrical indicator is integrally formed with an outer cylindrical portion having an insertion gap portion for inserting a joining pipe from the inner portion of the inner cylindrical portion. And mounting an inner peripheral seal member in the mounting groove formed in the inner cylinder portion, mounting an outer peripheral seal member in the mounting portion formed in the outer cylinder portion, and a guide ring formed of an elastic material such as rubber. One-touch for a resin tube, wherein the inner peripheral seal member and the inner cylindrical portion are pressed by the inner peripheral surface of the guide ring by inserting into the insertion gap and pressing the outer peripheral surface of the guide ring with the outer peripheral seal member Fittings.   The resin according to claim 3, wherein an engaging convex portion is formed on a distal end side of the outer peripheral surface of the guide ring, and the outer peripheral seal member is engaged with the engaging convex portion to press and hold the outer peripheral surface of the guide ring. One-touch fitting for pipes.   The outer peripheral surface of the guide ring is formed into a tapered surface, and the tapered surface is pressed by the outer peripheral seal member to bring the inner peripheral surface of the guide ring into surface contact with the outer peripheral surface of the inner cylinder portion. One-touch fitting for plastic pipes.   The one-touch joint for resin pipes according to any one of claims 3 to 5, wherein an outer periphery of a storage chamber formed in a back portion of the insertion gap portion is formed as a tapered surface.   The one-touch joint for resin pipes according to any one of claims 3 to 6, wherein the front end surface of the joining pipe inserted into the insertion gap is pressed and contacted while following the elasticity of the rear end surface of the guide ring.   When the guide ring is pressed by the joining pipe inserted into the insertion gap, and the guide ring is guided to the storage chamber at the back of the insertion gap, the outer circumference of the junction pipe and the inner circumference of the outer cylinder The outer peripheral seal member in the mounting portion is pressed and moved to the opening side of the joint body by compressed air communicating through a clearance provided between the inner and outer seal surfaces of the joint pipe, and the inner and outer seal members are held by pressure. The one-touch joint for resin pipes according to any one of claims 3 to 7.   The one-touch joint for resin pipes according to claim 8, wherein a step groove portion for preventing the guide ring from slipping back is formed on the inner peripheral surface of the storage chamber. The joint body is formed by screwing a joint portion and a covering cylinder, forming a viewing window in the covering cylinder, and forming the cylindrical indicator with a transparent or translucent resin, and connecting pipes in the joint. The one-touch joint for resin pipes according to any one of claims 3 to 9, wherein a connection state can be confirmed from outside.

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