JP2010101475A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint manufacturable easily at low cost while sufficiently exhibiting the function as a slip-off prevention ring and preventing a pipe from being extracted if the pipe is inserted to a position where the pipe is brought into contact with a packing. <P>SOLUTION: This pipe joint includes: a joint body 1 having a main part 10 from which a tubular part 11 projects; the packing 9 which is fitted into an annular groove 11c provided on the outer peripheral surface 11f of the tubular part, and fits into and seals a connection pipe 5 fitted into the tubular part; the slip-off prevention ring 2 molded into a C-shaped split ring so that a machined bar having a sharp end 22 capable of biting in the inner peripheral surface 53 of the pipe is disposed on the outer peripheral side with its sharp end disposed on the outer peripheral side; and a peripheral groove 11e having, in addition to a deep groove part 11e0 which is peripherally formed in the outer peripheral surface 11f of the tubular part and to which the slip-off prevention ring 22 is fitted, a sloped groove part 11e1 which has a wall surface on the tubular part tip side of the deep groove part, the outer diameter of which is gradually increased from the bottom of the deep groove part toward the tubular part tip side and which extends from the deep groove part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a one-touch pipe joint that is used as a joint for a water distribution pipe or the like and can be connected and integrated simply by inserting a pipe such as a resin pipe.

  There are pipe joints that are integrated by simply inserting a pipe such as a resin pipe, and among them, there is a type in which a retaining ring bites into the inner peripheral surface of the pipe and the pipe is locked. When the connecting pipe is fitted over the cylindrical part protruding from the joint body, the packing attached to the outer peripheral surface of the cylindrical part adheres to the pipe and seals, and the claw of the retaining ring is attached to the inner peripheral surface of the pipe. It is a pipe joint that bites in and connects together. For this type of pipe joint, various structural products have been proposed so far (for example, Patent Documents 1 to 4).

JP, 2006-343947, A) JP 2007-239986 A JP 2003-222282 A JP-A-9-236190

However, in the conventional pipe joint in which the retaining ring bites into the inner peripheral surface of the pipe and is connected and integrated, as in Patent Documents 1 to 3, the pipe is retained by a serrated engaging tooth portion in which a plurality of teeth are arranged. What you do was common. Although many teeth could bite into the pipe, the force could not be concentrated on one point, and the biting power was weak. On the other hand, the retaining ring of Patent Document 4 is formed in an annular shape having a square cross section, and has a shape such as a plurality of inner tongue pieces provided on the inner rim and a plurality of tongue pieces provided on the outer rim. Was complicated. And many of the conventional retaining rings are cutting products, and have been expensive.
Moreover, the engagement tooth part which concerns on patent documents 1, 2 was made to fit in the recess formed in the cylindrical part outer peripheral surface, and this engagement tooth part was left still in the recess. At the stage where the engaging tooth portion was fitted in the recess, the depth of biting into the pipe was uniquely determined. While adopting a structure in which the pipe is externally fitted to the cylindrical portion provided with the engagement tooth portion, after the external fitting, the engagement tooth portion has to be deeply bite into the pipe, and it is difficult to secure the bite. For this reason, sometimes, a fastening ring described in Patent Document 1 is provided, or a protrusion member held in a state of elastic movement biasing radially outward on the joint body side is disclosed in Patent Document 2. It has been necessary to provide a “return prevention mechanism” that elastically engages with a recess formed on the surface to prevent the fastening ring from returning in the screw loosening direction. On the other hand, Patent Document 4 increases the biting force into the pipe with the help of the elasticity of the retaining ring itself, but requires a separate adapter part.

  Furthermore, at the construction site, when a pipe is inserted and connected to a pipe joint, it may be unintentionally pulled out during insertion after touching the packing. When the pipe was pulled out and inserted again into the pipe joint, the sealing function by packing could not be exhibited.

  The present invention solves the above problems, and can be manufactured easily and at a low cost while fully functioning as a retaining ring, and if the pipe is inserted to a position where it touches the packing, the pipe is pulled out. It aims at providing the pipe joint which cannot be performed.

In order to achieve the above-mentioned object, the gist of the invention described in claim 1 is that the main body is mounted on a joint body having a cylindrical portion projecting and an annular groove provided on the outer peripheral surface of the cylindrical portion. A packing that tightly adheres to and seals a connecting pipe that is externally fitted to the shaped part, and a retaining ring that is molded into a C-shaped split ring that has a sharp end that can bite into the inner peripheral surface of the pipe on the outer peripheral side; In addition to the bottom part that is formed around the outer peripheral surface of the cylindrical part and the retaining ring is fitted and mounted, the wall surface of the bottom part of the cylindrical part is directed from the bottom part of the bottom part toward the distal end side of the cylindrical part. A pipe joint comprising: an outer diameter gradually increasing and a circumferential groove having a slope portion extending from the bottom portion.
A pipe joint according to a second aspect of the present invention is the pipe joint according to the first aspect, further comprising a front wall that rises from the groove bottom in the radially outward direction of the cylindrical portion as the groove wall on the distal end side of the cylindrical portion related to the circular groove. And A pipe joint according to a third aspect of the present invention is the pipe joint according to the first or second aspect, wherein the circumferential grooves are provided on the distal end side and the rear end side of the cylindrical portion so as to sandwich the annular groove, and the bottoms of both the circumferential grooves are respectively withdrawn. A stop ring is attached. A pipe joint according to a fourth aspect of the present invention is the pipe joint according to the first to third aspects, wherein the retaining ring is formed into a deformed bar or a deformed wire having a pointed end by press working or drawing, and further C-shaped split by bending. It is formed into a ring.

As in the first aspect of the present invention, a circumferential groove and a retaining ring provided in the cylindrical portion are provided, the circumferential groove has a slope portion extending from the bottom, and the retaining ring is a C-shaped split ring. When molded, the retaining ring accompanies the pipe by the pulling movement of the pipe that is externally fitted to the cylindrical portion, and the ring diameter increases. Along with this diameter expansion, the claw at the tip end bites deeply into the inner peripheral surface of the pipe, so that a force that prevents the pipe from being pulled out acts and the movement of the pipe can be stopped quickly. Using a retaining ring molded into a C-shaped split ring with the pointed end on the outer peripheral side can be used to effectively bite the pipe at the pointed end, which is extremely effective in preventing the pipe from being pulled out. . Since the structure of the retaining ring can be simplified, the cost can be reduced.
As in the second aspect of the present invention, when a front wall standing up from the groove bottom in the radial direction of the tubular portion is further provided as a groove wall on the distal end side of the tubular portion related to the circular groove, the pipe 5 connected to the pipe joint is provided. Even if a large pulling force is applied to the pipe 5, the retaining ring 2 accompanying the pulling of the pipe 5 stops against the front wall, so that it is possible to prevent the pipe 5 from having a large pulling force.
As in the third aspect of the present invention, when the circumferential groove is provided on the distal end side of the cylindrical portion with respect to the position of the packing attached to the annular groove, and the retaining ring is attached thereto, the retaining ring on the distal end side of the tubular portion is Since the pipe that has passed through and inserted into the cylindrical portion cannot be pulled out by the claw of the retaining ring, the packing is pulled out from the annular groove and cannot be maintained with the conventional pulling during the pipe insertion. The trouble can be solved. Then, when the circumferential groove is provided on the distal end side and the far end side of the cylindrical portion so as to sandwich the annular groove, and the retaining ring is attached to the bottom of each circumferential groove, two retaining rings are provided. Since it can cope with the pulling force of the pipe, the load of each retaining ring can be halved. According to the invention of claim 4, when the retaining ring is formed into a deformed bar or deformed wire having a pointed end by pressing or drawing, and further formed into a C-shaped split ring by bending, the retaining ring The cost can be further reduced.

  The pipe joint according to the present invention can prevent the pulling force applied to the pipe inserted into the cylindrical portion with the retaining ring, while allowing the retaining ring to be manufactured easily and at low cost. Once inserted into the pipe joint, it is impossible to withdraw, preventing misuse when connecting the pipe to the pipe joint, and exhibiting a number of excellent effects such as perfect sealing by packing.

  Hereinafter, the pipe joint according to the present invention will be described in detail. 1 to 9 show an embodiment of a pipe joint of the present invention. FIG. 1 is a front view of a pipe joint in which the upper stage is shown in cross section, and FIG. 2 is a connection joint in which a connecting pipe is inserted into the pipe joint. FIG. 3 is an explanatory sectional view, and FIG. 3 is a plan view of the retaining ring, and (b) is a view taken along the line IV-IV of (a). FIG. 4 is a longitudinal sectional view of the retaining ring, in which (A) is an enlarged view of FIG. 3, and (B) and (C) are other views. 5 is a partially enlarged view of FIG. 1, FIG. 6 is an explanatory view in which the pipe is inserted into the cylindrical portion from the state of FIG. 5, FIG. 7 is an explanatory view when the pipe is pulled out and moved from the state of FIG. FIG. 9 and FIG. 9 are explanatory diagrams for comparison when the retaining ring of the present invention is not provided.

  The pipe joint includes a joint body 1, a packing 9, a retaining ring 2, a correction member 4, and a cap nut 3 (FIG. 1). The pipe joint assembled with these is such that when the connecting pipe 5 is inserted from the opening 30 of the cap nut 3 and fitted onto the outer peripheral surface of the cylindrical portion 11 (externally fitted), the packing 9 is between the pipe and the cylindrical portion. The claw 22 of the retaining ring 2 bites into the pipe 5 so that the pipe 5 is connected and integrated.

  The joint body 1 is a product in which a substantially cylindrical tubular portion 11 is formed so as to protrude from a main portion 10 corresponding to a central portion thereof, and is a main part of a pipe joint (FIG. 1). A fastening portion 13 for attaching the cap nut 3 is provided on the main portion 10 on the side where the cylindrical portion 11 is provided, and a connecting portion 15 connected to another joint is provided on the opposite side. An outer circumferential surface 11f of the cylindrical portion is provided with a circumferential groove 11e for mounting the retaining ring 2 and an annular groove 11c for mounting the packing 9 (FIG. 3).

The joint main body 1 of the present embodiment has a prismatic main portion 10 that can be gripped with a tool, and an end portion protruding in the axial direction to form a fastening portion 13 of a male screw portion 13a on the outer periphery. The cylindrical portion 11 is further formed to project from the end face of the overhang portion. Further, the other end surface of the main portion 10 protrudes in the axial direction to form a connecting portion 15 having a male screw portion 15a on the outer periphery. In order to function as a pipe joint, the joint body 1 is provided with a conduction hole 19 penetrating in the axial direction from the tubular portion 11 to the overhanging portion 12, the main portion 10, and the connecting portion 15, and these portions are integrally processed. Yes.
A tapered portion 11d whose outer diameter gradually decreases toward the tubular portion distal end 11b is provided at the distal end portion of the tubular portion 11.

  Two annular grooves 11c having the same shape are formed a little apart, and one annular groove 11e having the same shape is formed on the tip 11b side and the back end 11a side of the cylindrical portion 11 so as to sandwich both annular grooves 11c. Form. The circular groove 11e formed on the distal end side of the tubular portion is provided closer to the distal end 11b of the tubular portion than the position where the correction member 4 (described later) fitted loosely on the tubular portion 11 is disposed. Here, when a plurality (two in this embodiment) of the annular grooves 11c are provided, the circumferential groove 11e is further on the distal end side of the tubular portion 11 than the annular groove 11c provided on the distal end side of the tubular portion 11. A circular groove 11e is provided on the far end side of the tubular portion 11 more than the annular groove 11c provided on the far end side of the tubular portion 11. The “back end of the cylindrical part” is used from the viewpoint of inserting the pipe 5 as a pipe joint into the cylindrical part 11 from the viewpoint of inserting from the distal end 11b of the cylindrical part into the inner part of the cylindrical part 11. From the viewpoint of projecting the cylindrical portion 11 to 10, “the inner end of the cylindrical portion” corresponds to the proximal end of the cylindrical portion 11.

  The annular groove 11c is formed around the outer peripheral surface 11f of the cylindrical portion with an equal cross-sectional shape. The shape of the outer periphery of the packing 9 is made to protrude from the outer peripheral surface 11f of the cylindrical portion, so that the packing 9 can be housed and retained.

Similarly to the annular groove 11c, the circular groove 11e is formed in a circular section on the outer peripheral surface 11f of an equal cross section. As shown in FIG. 1, in addition to the bottom portion 11e ₀ where the retaining ring 2 initially fits, the wall surface on the cylindrical portion tip 11b side of the bottom portion is inclined upward from the bottom surface of the bottom portion 11e ₀ toward the tubular portion 11. The groove shape is provided with the gradient portion 11e ₁ . In addition to the bottom portion 11e ₀ to which the retaining ring 2 is fitted and attached, the circumferential groove 11e has a wall surface on the cylindrical portion distal end 11b side of the bottom portion that is outward from the bottom portion α of the bottom portion toward the tubular portion distal end 11b side. It becomes a conical surface γ having a gradually increasing diameter, and has a slope portion 11e ₁ extending from the bottom portion. Further, a straight portion 11e ₂ having a constant outer diameter extends from the bottom portion of the gradient portion 11e ₁ toward the cylindrical tip 11b in the circumferential groove 11e. And, as the groove wall on the cylindrical portion distal end 11b side of the straight portion, a front wall δ standing vertically from the groove bottom in the radially outward direction of the cylindrical portion is provided.

  The packing 9 is a member that is attached to the annular groove 11c and seals closely to the connecting pipe 5 that is fitted around the cylindrical portion 11. Here, the packing 9 is an O-ring made of rubber or the like. The outer periphery of the O-ring 9 attached to the annular groove 11c protrudes from the annular groove 11c. The O-ring is inserted from the opening 30 of the cap nut 3 and is in close contact with the pipe 5 fitted on the cylindrical portion 11 to seal between the pipe 5 and the cylindrical portion 11 (FIG. 2).

  The retaining ring 2 is formed into a C-shaped split ring by forming as shown in FIG. 3 after forming a deformed wire (or deformed bar) having a sharp tip 22 that becomes a retaining ring claw by pressing or drawing. It is a processed metal product. As shown in FIG. 4 (a), the tip 22 that can bite into the inner peripheral surface 53 of the pipe 5 is provided at one location in a longitudinal sectional view, and the tip 22 is arranged on the outer peripheral side to form a C-shaped split ring. It is a molded retaining ring. The retaining ring 2 is configured so that the tip 22 becomes the outer peripheral edge of the C-shaped split ring in plan view (a in FIG. 3), and the tip has the role of the claw 22 that bites into the pipe 5. The pointed claw 22 bites into and engages the inner peripheral surface of the pipe fitted on the cylindrical portion 11 to prevent the pipe 5 from being pulled out of the joint body 1. The same shape retaining ring 2 is used for the two circumferential grooves 11e.

In the present embodiment, a retaining ring is formed by separating from a metal round bar having a circular cross section indicated by a chain line in FIG. 3B and smaller than a ¼ arc indicated by a solid line (a in FIG. 4). The processed bar formed to be smaller than the 1/4 arc has a cross-sectional shape having a sharper tip 22 than the cut product of the 1/4 arc. The tip 22 runs in the longitudinal direction of the processed bar. It becomes easy to bite in by the pipe inner peripheral surface 53 by becoming an acute angle. After that, the processed bar provided with the tip is formed into a split ring so that the tip 22 becomes the outer peripheral edge of the ridge as shown in FIG. And a retainer ring 2 of the C-shaped split ring having a cut portion 2a of the angle theta _2. As shown in FIG. 3B, the tip 22 is arranged on the outer peripheral side, and the retaining ring 2 of the C-shaped split ring is formed by arranging the flat press-cut surface as the bottom 23 on the inner peripheral side.

As shown in FIG. 1, the retaining ring 2 is mounted in the circumferential groove 11 e with the arcuately curved front surface portion 21 disposed on the cylindrical portion distal end 11 b side. The inner diameter _{d 2} of the retainer ring is sized to fit into the bottom 11e ₀ of 11e in circumferential groove. Spread mouth defect 2a of the split ring, the retainer ring 2 is attached to the bottom 11e ₀ of peripheral groove 11e is elastically deformed. The retaining ring 2 is disposed so as to float from the bottom portion α of the bottom portion 11e ₀ (FIG. 5). By making the front surface portion 21 an arc-shaped curved surface as shown in the drawing, the pipe 5 inserted into the cylindrical portion 11 can easily pass over the retaining ring. When the pipe 5 passes over the retaining ring 2 by inserting the pipe into the cylindrical portion 11, the back surface portion 20 of the precipice of the retaining ring 2 is received by the rear wall β of the bottom portion 11e ₀ , and the pipe is removed. Helps pass over the stop ring 2. The retaining ring 2 is provided with a claw 22 at the tip on the outer peripheral side of the split ring, and has a split ring outer diameter D ₂ larger than the inner diameter d _{5 of the} pipe 5 and is fitted on the tubular portion 11. The claw 22 bites into the pipe 5 so that the pipe 5 can be connected and integrated (FIG. 2). Here, the outer diameter of the retainer ring 2 which is mounted on the peripheral groove 11e is or becomes elliptical rather than round, if elliptical, the long axis length be larger than the pipe inner diameter d ₅ . This is because the claw 22 in the long-axis length portion bites into the inner peripheral surface 53 of the pipe 5 so that the pipe 5 can be connected and integrated with the pipe joint.

  The retaining ring 2 is slightly spaced from the packing 9 mounted in the annular groove 11c, and the circumferential groove 11e provided on the distal end 11b side and the rear end 11a side of the cylindrical portion 11 so as to sandwich the packing. It is attached to. The retaining ring 2, the two packings 9, and the retaining ring 2 are disposed at predetermined intervals from the tubular portion distal end 11 b toward the tubular portion inner end 11 a. The reason why the retaining ring 2 is attached to the distal end side cylindrical portion 11 with respect to the packing 9 is to prevent the pipe 5 inserted into the tubular portion 11 beyond the distal end side retaining ring 2 from being pulled out. On the other hand, the retaining ring 2 is attached to the cylindrical portion 11 at the far end side of the packing 9 as long as each retaining ring 2 bears half of the pulling force of the pipe 5, the pulling movement of the pipe 5 can be prevented. Because. Furthermore, the retaining ring 2 on the cylindrical portion distal end 11b side is submerged if the pipe 5 is connected to the pipe joint and used in the water distribution pipe, but is disposed closer to the tubular portion inner end 11a than the packing 9. This is because the retaining ring 2 can be placed in an air environment that hardly corrodes.

4B and 4C are cross-sectional views of the retaining ring 2 according to another embodiment. When the pipe 5 inserted into the cylindrical portion 11 beyond the retaining ring 2 is pulled out, the retaining ring accompanies the pipe 5 in the pulling direction, and the cone of the slope portion 11e ₁ as shown in FIG. The ring diameter is increased by moving on the surface γ. With the expansion of the retaining ring, the claw 22 can penetrate deeply into the pipe 5 and prevent the pipe 5 from being pulled out. In order to smooth the movement of the retaining ring 2 on the conical surface γ, in FIG. 4 (b), the retaining ring 2 of (a) of the present embodiment is used, and further, the rounded radius of the contact portion with the conical surface is smooth. Apply. In FIG. 4C, the bottom 23 is formed into an arcuate curved surface so that the movement of the retaining ring 2 on the conical surface is smooth. In addition, the retaining ring 2 is formed with a front surface portion 21 formed on an inclined surface as shown in the drawing so that the pipe 5 inserted into the cylindrical portion 11 can easily pass over the retaining ring 2.

  The correction member 4 is a tubular body that is loosely fitted into the tubular portion prior to the external fitting of the pipe 5 to the tubular portion 11. An inclined portion 41 that gradually increases in diameter from the small diameter portion 42 whose inner diameter is smaller than the outer diameter of the packing 9 toward the back end 11a side of the cylindrical portion is provided, and is arranged on the distal end 11b side of the cylindrical portion 11. The straightening member 4 having a larger cylinder inner diameter arranged on the inner end 11a side of the cylindrical part through the inclined part than the inner diameter of the cylinder is formed (FIG. 1). The end face 47 receives a pressure from the pipe 5 inserted through the opening 30 and fitted on the cylindrical portion 11, and the correction member moves to the inner end 11 a side of the cylindrical portion.

The correction member 4 of the present embodiment is a cylindrical body having a constant outer diameter, and the outer diameter is smaller than the inner diameter of the cap nut 3. Reference numeral 40 denotes a cylindrical hole. As shown in FIG. 1, the inner diameter of the correction member is a portion of the inclined portion 41 where the inner diameter d ₄₂ has passed the constant small-diameter portion 42, and the inner diameter gradually increases and is finally equal to the outer diameter of the packing 9 or this. The cylinder inner diameter d ₄₃ is larger than that. Then, the large diameter portion 43 is formed by extending while maintaining the inner diameter of the cylinder. Cylinder inner diameter d ₄₃ of the large-diameter portion 43 is equal to the outer diameter of the packing 9, or packing 9 is sized to fit in the large diameter portion 43. The straightening member 4 is loosely fitted into the cylindrical portion 11 and, before being used as a pipe joint, is inclined to the O-ring 9 and the chain line position where the end face 47 of the small diameter portion 42 is locked to the retaining ring 2 as shown in FIG. It can move between solid line positions where the portion 41 is locked. The outer diameter (or major axis length) of the retaining ring 2 is larger than the cylindrical inner diameter d ₄₂ of the small-diameter portion 42, and the movement of the correction member 4 to the cylindrical portion tip 11 b is locked by the retaining ring 2. . Therefore, an O-ring 9 and a retaining ring 2 are attached to the tubular portion, and further, a correction member 4 loosely fitted to the tubular portion 11 is covered, and a cap nut 3 is screwed and integrated into the joint body 1. In the assembled product, the correction member 4 does not fall out of the cylindrical portion 11. If a predetermined external force is applied to the correction member 4, the elastically deformable correction member 4 can get over the retaining ring 2, but this does not happen under normal handling conditions such as storage and transportation.
The correction member 4 that is loosely fitted to the cylindrical portion 11 is such that the large-diameter portion 43 covers the first and second O-rings 9 at the solid line position in FIG. Provided. At this time, the large-diameter portion 43 has a length exceeding the first O-ring 9 and further exceeding the top of the second O-ring 9 as shown.

The correction member 4 is made of an elastically deformable material (here, rubber) such as rubber or thermoplastic elastomer, and the hardness thereof is equal to or higher than the hardness of the packing 9. When the obliquely cut pipe 5 is inserted into the cylindrical portion 11, the correction member 4 is elastically deformed and received according to the oblique cut end surface 55 of the pipe 5 (FIG. 10), to the cylindrical portion 11 of the pipe 5. This is to make the external fitting smooth. Relationship correcting member 4 and pipe 5, a small-diameter portion an inside diameter d ₄₂ of the correcting member 4 to slightly smaller than, or which is equal to the inner diameter d ₅ of the pipe 5 (Fig. 1, Fig. 2). For the outer diameter of the pipe 5 substantially equal to the outer diameter D ₄ of the correcting member 4 to the pipe outside diameter D _5.
In the pipe joint of FIG. 1, before use, the packing 9 locks the correction member with the inclined portion 41 to the movement of the correction member 4 toward the cylindrical portion rear end 11 a side, and the cylindrical portion 11 is more than the packing. A small diameter portion 42 is disposed on the tip 11b side. The inclined portion 41 (correcting member 4) locked to the packing 9 receives the pressure from the pipe 5 that is fitted on the cylindrical portion 11 and presses and deforms the packing. 11 to the rear end 11a side. Here, the reason why the hardness of the straightening member 4 is equal to or higher than the hardness of the packing 9 is to make the packing 9 surely press-deform with the inclined portion 41 while being elastically deformable by itself.

The cap nut 3 is a part in which a female thread portion 34 provided on the inner peripheral surface is screwed into the male thread portion 13a of the joint body 1 (FIG. 1). Along with the O-ring 9, the retaining ring 2 attached to the tubular portion 11, and the correction member 4 loosely fitted to the tubular portion 11, a cap nut 3 having a size that covers the tubular portion and can be attached to the joint body 1. And A circular opening 30 for inserting the connecting pipe 5 into the nut head is formed. Reference numeral 35 denotes a through hole of the cap nut 3.
The cap nut 3 of the present embodiment has a cylindrical shape with a substantially constant cylinder outer diameter and cylinder inner diameter. The cylinder inner diameter has a larger opening toward the opening 30 on one end side, and the connecting pipe 5 is connected to the pipe joint. To make it easier to plug in. Further, a female screw portion 34 that is screwed with the male screw portion 13 a of the fastening portion 13 is provided on the inner surface of the cylinder on the other end side opposite to the opening 30. The code | symbol 37 shows a through-hole, and is a peephole which confirms whether the connecting pipe 5 inserted in a pipe joint is inserted to the predetermined position.

  Moreover, although it is not a structural component of this pipe joint, the connection pipe 5 used for this is described. The connecting pipe 5 can be applied not only to a synthetic resin resin pipe but also to a composite product of synthetic resin and metal. Specifically, a metal composite cross-linked polyethylene pipe made of a metal such as aluminum excellent in mechanical strength as a core material and a cross-linked polyethylene excellent in heat resistance in the inner and outer layers. These connecting pipes 5 also have a resin layer on the outer layer, and the claw 22 of the retaining ring 2 elastically bites into the inner peripheral surface 53 of the connecting pipe 5 that is introduced into the cylindrical portion 11 and is externally fitted. This is because the effects and advantages of the present invention can be obtained as in the case of the resin pipe. In the figure, reference numeral 50 denotes a pipe hole, reference numeral 51 denotes a pipe body, and reference numeral 52 denotes an outer peripheral surface of the pipe.

  Next, one use point and operation of the pipe joint composed of the components shown in FIGS. 1 to 7 will be described. First, the first and second O-rings 9 are attached to the annular groove 11c provided in the tubular part 11 of the joint body 1, and the retaining ring 2 is attached to the circumferential groove 11e on the tubular part inner end 11a side. Next, the correction member 4 is fitted into the cylindrical portion 11 and loosely fitted into the cylindrical portion. Subsequently, after the inclined portion 41 of the correction member is moved to the first O-ring 9 side, the retaining ring 2 is attached to the circumferential groove 11e on the cylindrical portion distal end 11b side. Thereafter, the female threaded portion 34 of the cap nut 3 is screwed to the male threaded portion 13 a provided on the outer periphery of the joint body 1. This completes the pipe joint (FIG. 1).

In this pipe joint, the pipe 5 is connected and integrated with the pipe joint simply by inserting the connecting pipe 5 into the cylindrical portion 11 through the opening 30 of the cap nut 3. In addition, after the pipe 5 is inserted into the cylindrical portion 11 and passes through the first retaining ring 2, the pipe 5 can no longer be pulled out, and the defective withdrawal of the packing 9 from the annular groove 11 c is eliminated.
Specifically, when the connecting pipe 5 is inserted from the opening 30, the pipe 5 is introduced into the cylindrical portion 11 and fitted into the cylindrical portion from the outside. Even if the cut end surface 55 of the pipe 5 is flattened into an oval shape by a cutter or the like, it is corrected by the taper 11d to promote circularization. Then, the pipe tip 54 gets over the first retaining ring 2. The claw 22 is formed on the retaining ring 2. At the stage of inserting into the cylindrical part 11, the direction in which the pipe 5 is inserted into the cylindrical part 11 is the direction in which the retaining ring 2 is pushed into the bottom part 11 e ₀ , and the retaining ring Since the front part 21 of 2 is an arc-shaped curved surface, the pipe 5 slides here and goes to the cylindrical part back end 11a. When the pipe tip 54 reaches the correction member 4, the pipe end surface 55 comes into contact with and pushes the end surface 47 of the correction member 4. 6, the inclined portion 41 of the correction member 4 presses and deforms the O-ring 9 in response to the pressure in the direction of the arrow from the pipe 5. With the progress of pressing toward the back end 11a of the pipe 5, the inclined portion 41 slides on the first O-ring 9 so that the O-ring is elastically deformed from the state shown in FIG. Overcoming this. The correction member 4 literally corrects the O-ring 9 and holds it in the annular groove 11c, so that the O-ring 9 does not escape from the annular groove 11c.

Here, even if it is going to pull out the pipe 5 from the state of FIG. 6, it cannot pull out. 6, when the pipe 5 is pulled out in the direction of the arrow as shown in FIG. 7, the claw 22 of the retaining ring 2 has already digged into the inner peripheral surface 53 of the pipe 5 as shown in FIG. The retaining ring 2 also accompanies the drawing movement of the pipe 5. By pulling out the pipe 5, the retaining ring 2 moves from the initial chain line position of the bottom part 11 e ₀ in FIG. 7 to the solid line position while expanding the ring diameter on the conical surface γ of the gradient part 11 e ₁ . As a result, the claw 22 bites deeper into the pipe inner peripheral surface 53 and prevents the pipe 5 from being pulled out. The solid line position of the retaining ring in FIG. 7 is schematically shown. Actually, the retaining ring 2 is prevented from being pulled out while the retaining ring 2 is rising on the conical surface γ of the slope portion 11e ₁ . In this circumferential groove 11e, a straight portion 11e ₂ is extended from the slope portion 11e ₁ to the cylindrical portion tip 11b side, and the retaining ring 2 is unnecessarily deep in the pipe 5 at the straight portion 11e ₂ . Prevent biting. Thus, if the pipe 5 is inserted beyond the retaining ring 2 arranged on the tip end 11b side of the cylindrical portion 11, the pipe joint becomes the only joint after which the pipe 5 can be inserted. Finally, the correction member 4 that has received the pressure from the end face 55 at the tip end of the pipe reaches the back end 11a of the cylindrical portion 11 as shown in FIG.

At this point, the O-ring 9 that has been elastically deformed and submerged in the annular groove 11c is brought into close contact with the pipe inner surface 53 by its elastic restoring force and reliably sealed (FIG. 2). Further, the retaining ring 2 uses the claws 22 to integrate the pipe 5 into the joint body 1. If pulling force Kuwaware the pipe 5 fitted on the cylindrical portion 11, to expand the split ring outer diameter retainer ring 2 is up the slope portion 11e ₁ from the bottom 11e _0, the pawl 22 is pipe circumference Cut deep into surface 53. Connection and integration of the pipe 5 to the pipe joint by the claw provides a stronger joining force, which immediately exceeds the pulling force and stops. In this way, the one-touch integrated connection of the pipe 5 to the main pipe joint is ensured.

  Further, the presence of the correction member 4 allows the pipe 5 to be inserted into the cylindrical portion 11 as it is even in a case where the pipe 5 is obliquely cut. Similar to the pipe end surface 55 of FIG. 6, the pipe tip 54 gets over the retaining ring 2. When the pipe tip 54 reaches the straightening member 4, the pipe end surface 55 hits the straightening member 4, and if drawn schematically, the straightening member 4 is elastically deformed and brought into contact with and pressed as shown in FIG. Become. Even if the correction member 4 is elastically deformed, the outer diameter is not increased due to the restriction of the inner diameter of the cap nut 3. With the pressing force of the pipe 5 toward the cylindrical portion inner end 11a, the inclined portion 41 located on the upper side where the pipe tip 54 protrudes in FIG. 10 first slides on the O-ring 9, and is crushed by elastic deformation. The inclined portion 41 and the small diameter portion 42 get over the O-ring. Slowly, the inclined portion 41 located below the pipe end surface 55 slides on the O-ring 9 and is crushed by elastic deformation, and the inclined portion 41 and the small-diameter portion 42 get over this. Thereafter, the connection is completed through the same operation as the connection of the pipe 5 with the pipe end face 55 cut at right angles to the pipe 5 to the pipe joint.

  The pipe joint configured as described above is formed into a C-shaped split ring in which a processed bar provided with a pointed end 22 that can bite into the inner peripheral surface 53 of the pipe 5 is arranged on the outer peripheral side. Since the retaining ring 2 is used, compared to a structure in which the pipe is retained by a plurality of teeth, a pipe joint is formed which is concentrated at one point and effectively bites into the pipe 5 to be connected and integrated. And since the tip 22 is made into a processing bar provided in one place in a cross-sectional view, the retaining ring 2 can be easily manufactured by pressing (or drawing), and the cost is reduced unlike conventional cutting products. it can. A beautiful shearing surface is obtained by the shearing process of the press work, and it becomes the tip 22 that bites into the inner peripheral surface 53 of the pipe 5 without performing a cutting process, so that the power as a nail can be fully exhibited.

In addition, 11e _{0 is} added to the bottom portion into which the retaining ring 2 is inserted and attached, and the outer wall surface of the bottom portion on the cylindrical portion tip 11b side gradually increases in diameter from the bottom portion α of the bottom portion toward the tubular portion tip 11b side. Since the slope portion 11e ₁ extending from the bottom portion is provided so that the pulling force is applied to the pipe 5 inserted into the pipe joint, the retaining ring 2 is accompanied by the pipe, and the top portion of the slope portion 11 The ring diameter is expanded by moving. Due to the diameter expansion of the retaining ring 2, the claw at the tip 22 deeply bites into the pipe 5, and the integration of the pipe 5 and the pipe joint further proceeds, and the pipe 5 cannot be pulled out from the pipe joint. When the outer diameter is the conical surface γ progressively increases toward the bottom portion of the bottom 11e ₀ alpha to the cylindrical tip 11b side, with withdrawal of the pipe 5, from the bottom 11e ₀ of the retainer ring 2 to the gradient portion 11e ₁ Since the movement becomes smoother, when a pulling force is applied to the pipe 5, this can be quickly prevented. When the engaging portion is stationary in the recess as in Patent Documents 1 and 2, a structure is adopted in which the pipe is externally fitted to the cylindrical portion provided with the engaging tooth portion. The engaging tooth portion had to be deeply bitten into the pipe, and it was difficult to secure the biting. On the other hand, in the present invention, the retaining ring 2 is moved to the slope portion 11e ₁ by using the pulling force itself of the pipe 5, and the claw 22 automatically bites into the pipe 5 automatically by the ring diameter expansion. As the bite progresses, the pipe 5 and the pipe joint are integrated. Further, the pipe is narrowed by the retaining ring and the cap nut, and the pulling force of the pipe 5 is countered. No additional parts such as an adapter as in Patent Document 4 are required, and the structure of the pipe joint can be simplified.
In addition to this, even if a high external force such as impact water pressure is applied to the pipe 5 connected to the pipe joint, the front wall δ acts as a stopper of the retaining ring 2 to prevent it. . After the pipe 5 is externally fitted to the cylindrical portion 11 and connected to the pipe joint, if a pulling force is applied to the pipe 5 due to a sudden water pressure or the like, the retaining ring 2 is accompanied by the pipe 5 and comes out. Stops against the front wall δ, which also has the effect of suppressing the pulling force of the pipe 5.

Further, since the peripheral groove 11e on the leading end 11b side and octane 11a side of the cylindrical portion 11 so as to sandwich the annular groove 11c is provided, and each retainer ring 2 to the bottom 11e ₀ of both circumferential groove is mounted The following excellent effects are also exhibited.
At the construction site where the pipe 5 is connected to the pipe joint, it may be unintentionally pulled out during insertion after the packing 9 is touched. When the pipe 5 is pulled out, the packing 9 may come out of the annular groove 11c and cause a problem that the sealing function is lost. The present invention solves such a problem. Since the retaining ring 2 is attached to the cylindrical portion 11 on the distal end side relative to the packing 9, it is possible to prevent the retaining ring 2 from pulling out before reaching the packing 9. If the retaining ring is exceeded, as described above, the pipe joint is then only inserted, and the pipe 5 cannot be pulled out after hitting the packing 9. It is structured so that work can be completed with a single operation.
If there is no retaining ring 2 on the cylindrical portion tip 11b side of the cylindrical portion position where the O-ring 9 is mounted, even if there is the correction member 4 that pushes and sinks the O-ring 9 into the annular groove 11c, It can lead to problems. This is because, after the pipe 5 is pushed forward to just the middle point of the O-ring 9 (FIG. 8), when the pipe 5 is pulled out, the deformed packing 91 as shown in FIG. 9 is formed and the sealing function may be lost. The retaining ring provided closer to the cylindrical portion distal end 11b than the packing 9 completely eliminates such a problem.
Further, by attaching the retaining ring 2 to the cylindrical portion 11 at the far end side than the packing 9, the retaining rings 2 on the distal end 11 b side and the deep end 11 a side of the cylindrical portion 11 are pulled out by the pulling force of the pipe 5. On the other hand, if the half force is received, it becomes possible to cope with it, and the structure of the retaining ring 2 can be further simplified. In addition, the retaining ring 2 disposed closer to the cylindrical portion rear end 11a than the packing 9 is not easily corroded because it is placed in an air environment, and effective against the pulling force acting on the pipe 5 over a long period of time. This can be prevented.

In the present embodiment, when the pipe 5 is inserted into the cylindrical portion 11, the pipe front end surface 55 comes into contact with the correction member 4, and the two are connected to each other. Take a chamfering role. The pipe end face 54 does not directly contact the O-ring 9, but the inclined portion 41 of the correction member 4 contacts the O-ring. A pressing force is applied from the pipe 5 to the correction member 4 in the axial direction of the cylindrical portion. The inclined portion 41 in contact with the O-ring 9 pushes and sinks the O-ring 9 into the annular groove 11c by elastic deformation. Subsequent pipes 5 can easily get over the O-ring. Thereafter, as shown in FIG. 2, when the pipe tip 54 reaches the deep end 11a of the cylindrical portion 11 via the correction member 4, the O-ring 9 pushed and sunk into the annular groove 11c is brought to the inner peripheral surface of the pipe by elastic restoring force. Seal closely.
Also, when cutting the pipe 5 a pipe cutter, even pipe diameter d ₅ of the pipe end face 55 is flattened into an oval, so providing a taper 11d on the tip portion of the cylindrical portion 11, a pipe to the tubular portion 11 5 If the pipe 5 is inserted, the pipe 5 can be modified into a circular shape as the pipe 5 is inserted.

  Furthermore, connection of the pipe 5 having the end face 55 obliquely cut to the pipe joint has been difficult in the past even if a chamfering machine (so-called hand taper reamer) is used. The correction member 4 follows the oblique cut end surface 55 by elastic deformation, and can be connected and integrated without difficulty. When the obliquely cut pipe 5 is inserted into the cylindrical portion 11 and hits the correction member 4, the pressure to insert the pipe 5 elastically changes the correction member 4 made of an elastic body. The end surface 47 of the small diameter portion 42 is elastically deformed in accordance with the shape of the pipe front end surface 55 that is cut obliquely. In response to pressing from the obliquely cut pipe 5 that fits around the cylindrical portion 11, for example, in FIG. 10, the upper inclined portion 41 first press-deforms the first O-ring 9 and overcomes this, It moves to the back end 11a side of the cylindrical part. Slowly, the inclined portion 41 on the lower side presses and deforms the first O-ring 9, gets over this, and moves to the inner end 11 a of the tubular portion 11. The same movement can be performed with respect to the second O-ring 9 and the retaining ring 2 on the inner end side of the tubular portion, and the oblique cut pipe 5 can be smoothly fitted onto the tubular portion 11. Although the correction member 4 is elastically deformed, the O-ring 9 can be reliably pressed and deformed by the correction member 4 because the hardness thereof is equal to or higher than the hardness of the packing 9.

In addition, the retaining ring 2 is mounted on the distal end side of the tubular portion 11 with respect to the position where the correction member 4 loosely fitted to the tubular portion 11 is disposed, and the outer diameter of the retaining ring is made smaller than that of the small diameter portion 42. Since the retaining ring is configured to lock the movement of the correction member to the tubular portion 11 so as to be larger than the cylinder inner diameter d ₄₂ , the O-ring 9, the retaining ring 2, and the correction member are attached to the joint body 1. 4. It can be an integrated assembly of pipe joints with cap nuts 3 assembled. It is easy to store, and each part is stored separately, so there is no situation where you lose one part. Since the correction member 4 does not fall out of the cylindrical portion 11, it is convenient to handle it. Further, in the pipe joint as shown in FIG. 1, the packing 9 hits and locks against the movement of the straightening member 4 toward the inner end 11a of the cylindrical portion before use as a pipe joint. Since no load is applied, this pipe joint has the advantage that it can be stored for a long time if it is unused.

  Further, as shown in FIG. 2, the pipe end 5 connected to the pipe joint by the end surface 55 of the pipe tip reaching the inner end 11 a of the cylindrical portion 11 via the correction member 4 is connected to the pipe joint via the correction member 4. Since it abuts against the end face of the overhanging portion 12 of the joint body 1, even if a metal composite pipe is used for the pipe 5, the problem of electrolytic corrosion does not occur. Since aluminum is usually used for the metal composite pipe and brass is usually used for the joint body 1, there is a problem of electrolytic corrosion if they are in contact with each other. Therefore, when a metal composite tube is used, measures have been taken so far to avoid contact between both by interposing a spacer such as non-conductive rubber. In the present invention, since the non-conductive rubber, thermoplastic elastomer or the like having excellent electrical characteristics is used for the correction member 4, there is an additional advantage that the cost for separately preparing the spacer and the mounting work can be reduced. Thus, this pipe joint exhibits a number of excellent effects.

  The present invention is not limited to those shown in the above-described embodiments, and various modifications can be made within the scope of the present invention depending on the purpose and application. The shape, size, number, etc., of the joint body 1, the retaining ring 2, the cap nut 3, the correction member 4, the packing 9, etc. can be appropriately selected according to the application. For example, the pipe joint shown in FIG. In the joint main body 1 shown in FIG. The nut member is detachable from the main portion 10 and is used by locking an inner flange 16a of the nut member 16 to an outer flange 10a provided on the main portion 10. The female screw part 16a of the nut member is used as a threaded part to form a connecting part 15 connected to another joint.

It is one form of the pipe joint of this invention, and is the front view of the pipe joint which carried out the cross section display of the upper stage. FIG. 2 is an explanatory sectional view in which a connection pipe is inserted into the pipe joint of FIG. (A) is a plan view of the retaining ring, and (b) is a view taken along line IV-IV in (a). FIG. 4 is a cross-sectional view of the retaining ring, in which (A) is an enlarged view of FIG. 3 and (B) and (C) are other embodiments. It is a principal part enlarged view of FIG. It is explanatory drawing which inserted the pipe into the cylindrical part from the state of FIG. It is explanatory drawing when a pipe is pulled out and moved from the state of FIG. It is contrast explanatory drawing in case there is no retaining ring of this invention. It is contrast explanatory drawing in case there is no retaining ring of this invention. It is explanatory sectional drawing which shows a mode that the correction member and packing deform | transform when inserting the pipe cut diagonally from the state of FIG. 1 in a cylindrical part. FIG. 8 is a front view of a pipe joint that is a different product from those shown in FIGS.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Joint main body 10 Main part 11 Cylindrical part 11a The inner end of a cylindrical part 11b The front-end | tip of a cylindrical part 11c Annular groove 11e ₀ circular groove 11e ₁ Gradient part 11f Outer peripheral surface 2 Stop ring 22 Tip (claw)
5 Connection pipe (pipe)
9 Packing (O-ring)
α Bottom part δ Groove wall (standing wall)

Claims (4)

A joint body having a cylindrical portion projecting from the main portion, a packing attached to an annular groove provided on the outer peripheral surface of the cylindrical portion, and tightly sealed to a connecting pipe that is externally fitted to the cylindrical portion; and A retaining ring formed in a C-shaped split ring with a sharp edge that can bite into the inner peripheral surface of the pipe on the outer peripheral side, and a loop formed on the outer peripheral surface of the cylindrical portion, and the retaining ring is fitted In addition to the bottom portion to be attached, the wall surface of the bottom portion of the tubular portion at the distal end side gradually increases in outer diameter from the bottom portion of the bottom portion toward the distal end side of the tubular portion, and a slope portion extending from the bottom portion is provided. A pipe joint comprising: a circumferential groove having the same. The pipe joint according to claim 1, further comprising a front wall that rises from a groove bottom in a radially outward direction of the tubular portion as a groove wall on a distal end side of the tubular portion related to the circumferential groove. 3. The pipe joint according to claim 1, wherein the circumferential groove is provided on a distal end side and a rear end side of the cylindrical portion so as to sandwich the annular groove, and the retaining ring is attached to a bottom portion of both the circumferential grooves. . The said retaining ring is shape | molded by the deformed bar or the deformed wire which provided the point by press work or drawing, and also shape | molded by the bending process in the C-shaped split ring. The pipe joint described.

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