JP5322679B2 - Insert member and joint used for joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert member used in a joint and a joint, easily correcting deformation of a resin pipe having a metal layer, and exhibiting excellent water tightness without damaging a seal ring in inserting the resin pipe. <P>SOLUTION: In the insert member 20 used in the joint 10, one end part thereof is provided with a tapered part 25 where the resin pipe 24 having the metal layer 23 at one end part is inserted to correct its deformation, the other end part is provided with a fit-in part 21 fitted and supported in a joint body 11, and the middle part 26 is provided with an annular groove 28 to which a pair of seal rings 27 are fitted. The outer peripheral part of the seal ring 27 is provided with a guide member 37 having a guide cylinder part 39 to which the resin pipe 24 is externally fitted and a guide head part 38 to which the end of the resin pipe 24 is abutted to guide insertion of the resin pipe 24 to the insert member 20. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an insert member and a joint used for a joint for connecting an end portion of a resin pipe having a metal layer to a faucet instrument in, for example, a water supply system or a hot water supply system piping system.

  2. Description of the Related Art Conventionally, in a water supply system or a hot water supply system piping system, a so-called one-touch joint that can be connected by simply inserting a resin pipe and is kept from coming off is known. In such a one-touch joint, a seal member (packing, O-ring, seal ring, etc.) is mounted between the resin pipe inserted into the joint body and the joint body, and watertightness is maintained. As a method for maintaining the watertightness, there are a so-called outer diameter sealing method for sealing the outer peripheral side of the resin pipe and a so-called inner diameter sealing method for sealing the inner peripheral side of the resin pipe.

  In the case of the outer diameter seal method, foreign matter and scratches are present on the outer peripheral surface of the resin pipe that is normally stored in an exposed state, so water leakage occurs when the resin pipe is connected to the joint. There is a case. On the other hand, in the case of the inner diameter seal method, since there is no such disadvantage because sealing is performed on the inner peripheral surface of the resin pipe, a water flow diameter is equal to the inner diameter of the resin pipe because a seal member or the like is inserted into the water flow portion. There was a drawback of being smaller than.

  Specifically, the following joints have been proposed as this type of joint (see, for example, Patent Document 1). That is, in this joint, a cylindrical guide part that externally fits the connecting pipe is provided inside the joint body, a seal member is mounted in a groove hole on the outer periphery of the guide part, and a cap nut that is screwed into the joint body; A ring that presses the connecting pipe is interposed between the guide portion and a guide ring that can cover the seal member is fitted on the outer periphery of the guide portion. When the connecting pipe is inserted into the joint body, the guide ring slides while pressing the outer peripheral surface of the seal member while the guide ring is sandwiched between the inner peripheral surface of the connecting pipe and the outer peripheral surface of the guide section. It has become.

Japanese Patent Laid-Open No. 2001-124258 (Page 2, Page 3, and FIG. 1)

  By the way, when using, for example, a resin pipe having a copper layer bonded to the inner peripheral surface of a crosslinked polyethylene layer or a resin pipe having a metal layer in which an aluminum layer is sandwiched between crosslinked polyethylene layers, the resin pipe is used. The metal layer is deformed at the cut end when cut to a predetermined length. For this reason, in the conventional joint described in Patent Document 1, when trying to externally fit a resin pipe having such a metal layer to the guide portion, the deformed metal layer hits the end surface of the guide portion, and it is easy. Can not fit. Therefore, it is necessary to correct the deformation previously formed at the end of the resin pipe to make it cylindrical, and such an operation is very complicated and time-consuming.

  Therefore, the object of the present invention is to easily correct the deformation of the resin pipe having the metal layer and to exhibit excellent water tightness without damaging the seal ring when inserting the resin pipe. It is an object to provide an insert member and a joint used for a joint that can be used.

In order to achieve the above object, an insert member used in the joint of the invention according to claim 1 is provided with a taper portion into which a resin pipe having a metal layer is fitted and inserted at one end so that the deformation is corrected. The other end portion is provided with a fitting portion that is fitted and supported in a joint body constituting the joint, and the intermediate portion is provided with an annular groove into which a seal ring is fitted. The outer periphery of the seal ring includes a guide tube portion on which a resin pipe is fitted, and a guide head portion on which an end portion of the resin pipe is brought into contact to guide insertion of the resin pipe into an insert member. A guide member is provided , and a bulging portion to which the guide head of the guide member is engaged is provided between the insertion portion and the intermediate portion of the insert member .

  In the invention according to claim 1, the insert member used in the joint according to claim 2 covers and protects the fitting portion and the guide member when the joint is not used or when the resin pipe is inserted into the tapered portion. A cover member is provided.

  The insert member used for the joint according to claim 3 is the insert member according to claim 2, wherein the cover member includes a small-diameter cylindrical portion that covers the fitting portion, and a large-diameter cylindrical portion that is larger in diameter than the small-diameter cylindrical portion and covers the guide member. It is formed in the shape of a covered cylinder provided.

  The insert member used for the joint according to claim 4 is the invention according to any one of claims 1 to 3, wherein the guide member has a length such that the guide tube portion covers the seal ring. Features.

  The insert member used in the joint according to claim 5 is the invention according to any one of claims 1 to 4, wherein the guide member has a guide head extending outward and further folded back. It is characterized by being formed into a curved surface.

  According to a sixth aspect of the present invention, in the invention according to the fifth aspect, the guide head of the guide member is provided with a groove in a portion folded back, and the guide head is located in the joint body. It is a non-watertight state when it comes into contact with the provided tip side sealing material.

  The joint according to claim 7 is a joint body according to any one of claims 1 to 6, wherein the joint body is formed in a cylindrical shape, and is inserted and supported in a state in which a resin pipe is inserted into the joint body. It comprises a member, a retaining member that retains and retains the resin pipe, and a fastening member that fastens and fixes the retaining member to the joint body.

  The joint according to claim 8 is the invention according to claim 7, wherein the insert member is inserted into the joint main body, and the distal end of the insertion portion contacts the proximal end side sealing material in the joint main body. When the tip of the resin pipe located at the rear end of the portion folded back is in contact with the tip side sealing material in the joint body, the portion folded back to the tip of the insertion portion of the insert member and the guide member The distance from the rear end portion is set to be equal to the distance between the proximal end side sealing material and the distal end side sealing material in the joint body.

In the insert member used for the joint according to the first aspect of the present invention, one end portion is provided with a taper portion into which a resin pipe having a metal layer is inserted so that the deformation thereof is corrected. For this reason, if the resin pipe which has a metal layer is inserted in the taper part of an insert member, the deformation | transformation part of the resin pipe end part will be gradually corrected, it will become cylindrical and it will be easily inserted in an insert member. Further, a guide member having a guide cylinder portion covering the outer peripheral portion of the seal ring and a guide head portion with which the resin pipe abuts is provided at an intermediate portion of the insert member. For this reason, the resin pipe is guided to the guide member, and the resin pipe is inserted into the insert member without the end of the metal layer contacting the seal ring.
Further, a bulging portion with which the guide head portion of the guide member is engaged is provided between the insertion portion and the intermediate portion of the insert member. For this reason, when a resin pipe having a metal layer is inserted into the insert member, the guide head of the guide member is pressed against the tip of the resin pipe and comes into contact with the bulging portion of the insert member, and the insertion of the resin pipe is stopped. Is done. As a result, it is possible to easily insert the resin pipe into the insert member.

  Therefore, the deformation of the resin pipe having the metal layer can be easily corrected, and excellent watertightness can be exhibited without damaging the seal ring when the resin pipe is inserted.

  The insert member according to claim 2 includes a cover member that covers and protects the fitting portion and the guide member when the joint is not used or when the resin pipe is fitted into the tapered portion. For this reason, in addition to the effect of the invention according to claim 1, it is possible to prevent dust and the like from adhering to the fitting portion and the guide member, and by hitting the insertion of the resin pipe into the tapered portion from above the cover member. The cover member can prevent the fitting portion from being damaged.

  In the insert member according to the third aspect, the cover member is formed in a covered cylindrical shape including a small-diameter cylindrical portion that covers the fitting portion and a large-diameter cylindrical portion that is larger in diameter than the small-diameter cylindrical portion and covers the guide member. For this reason, in addition to the effect of the invention which concerns on Claim 2, it can fully protect, without damaging an insertion part and a guide member with a cover member.

  In the insert member according to the fourth aspect, the guide member has such a length that the guide tube portion covers the seal ring. For this reason, in addition to the effect of the invention according to any one of claims 1 to 3, the water tightness by the seal ring is improved without further damaging the seal ring when the resin pipe is inserted into the insert member. Can do.

  In the insert member according to the fifth aspect, the guide member is formed in a curved surface shape with the guide head portion extending toward the outer periphery and further folded back. Therefore, in addition to the effect of the invention according to any one of claims 1 to 4, the structure of the guide member can be simplified and the guide function of the resin pipe can be improved.

  In the insert member according to the sixth aspect, the guide head of the guide member is provided with a groove in a portion folded back. For this reason, the groove can be brought into a non-watertight state when the guide head comes into contact with the tip side sealing material provided in the joint body, and water leakage occurs in the pressure resistance test after the resin pipe is connected to the joint. Therefore, in addition to the effect of the invention according to claim 5, it can be recognized that the insertion of the insert member to the joint body is insufficient.

  In the joint according to claim 7, a joint body having a cylindrical shape, the insert member that is fitted and supported in a state in which the resin pipe is fitted and inserted into the joint body, and a retaining member that retains and holds the resin pipe. And a fastening member that fastens and fixes the retaining member to the joint body. Therefore, the joint can achieve the effect of the insert member, and a simple operation of inserting a resin pipe having a metal layer into one end portion of the insert member and inserting the insertion portion at the other end into the joint body. The resin pipe can be easily connected to the joint.

  In the joint according to claim 8, the insert member is inserted into the joint main body, and the tip of the insertion portion is in contact with the base end side sealing material in the joint main body, and at the same time, after the portion folded back to the rear of the guide member. The tip of the resin pipe located at the end contacts the tip side sealing material in the joint body. At this time, the distance between the distal end of the insertion portion of the insert member and the rear end portion of the portion folded back to the rear of the guide member becomes equal to the distance between the proximal end side sealing material and the distal end side sealing material in the joint body. Is set to Therefore, in addition to the effect of the invention according to claim 7, even when the insertion of the insert member is insufficient, the watertightness between the distal end of the insertion portion of the insert member and the proximal end side sealing material in the joint body And the water tightness between the end of the resin pipe and the tip side sealing material in the joint body can be obtained, and the original water tightness can be exhibited.

The half sectional view showing the joint provided with the insert member in a 1st embodiment. Sectional drawing of the joint which shows the state which accommodated the insert member in the joint and protected with the cover member. Sectional drawing which shows the insert member equipped with the guide member. The disassembled perspective view which shows the state which attaches a retaining member, a split ring, a guide member, and a resin pipe to an insert member. It is a figure which shows the effect | action of an insert member, Comprising: (a) is sectional drawing which shows the state before inserting an insert member in a resin pipe, (b) is the state which inserted the insertion part of the insert member in the edge part of the resin pipe. (C) is sectional drawing which shows the state by which the edge part of the resin pipe was inserted to the intermediate part of the insert member, (d) is the edge part of the resin pipe inserted to the innermost part of the insert member. Sectional drawing which shows the state, and (e) is sectional drawing which shows the state which removed the cover member from the state of (d). (A) is sectional drawing which shows the state which inserts the insertion part of the insert member in which the resin pipe was mounted | worn in a joint, (b) shows the state which inserted the insert member in which the resin pipe was mounted in the middle of the joint. Sectional drawing. The perspective view which shows the state which has deform | transformed the metal layer after cut | disconnecting the resin pipe which has a metal layer. The perspective view which shows another example of a resin pipe. Sectional drawing which shows the coupling in 2nd Embodiment. (A) is a perspective view which shows an insert member, (b) is a side view which shows an insert member. Sectional drawing which shows the coupling in 3rd Embodiment. Sectional drawing of the coupling for showing the comparative example of 3rd Embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
(First embodiment)
As shown in FIG. 1, a substantially cylindrical joint main body 11 constituting the joint 10 is composed of a metal main body cylinder portion 12 and a male screw 13 on the outer periphery of the distal end portion (right end portion in FIG. 1) of the main body cylinder portion 12. It is comprised by the engagement cylinder part 15 made from a synthetic resin with which the internal thread part 14 was screwed together. The main body cylinder part 12 is made of an alloy such as brass or bronze, and the engagement cylinder part 15 is made of a transparent synthetic resin such as polyphenylsulfone (PPSU). Since the engagement cylinder portion 15 is formed of a transparent synthetic resin, the inside thereof can be seen through.

  A rubber-made first sealing material 16 is interposed between the main body cylinder portion 12 and the engagement cylinder portion 15 to maintain watertightness between the two. A male screw 17 is threaded on the outer periphery of the base end portion of the main body cylinder portion 12, and is screwed into a female screw of a faucet fitting (not shown). A flow hole 18 through which water (fluid) flows is formed inside the joint body 11. An engagement hole 19 having a diameter larger than that of the flow hole 18 in the intermediate portion of the main body cylinder portion 12 is provided on the inner periphery of the distal end portion of the main body cylinder portion 12.

  An insert member 20 formed of a metal such as brass, bronze, stainless steel (SUS304, SUS316, etc.), aluminum, or the like is inserted into the joint body 11 from the distal end side of the joint body 11, and a fitting portion on the proximal end side thereof. 21 is mounted so as to be engaged with the engagement hole 19 of the main body cylinder portion 12. The insert member 20 is formed in a cylindrical shape by punching a metal plate material by press drawing. The press drawing process is a method in which a metal plate material is supported on a die and the plate material is pressed by a punch while the periphery is pressed by a crease presser.

  The insert member 20 is provided with a tapered portion 25 into which one end portion (tip portion) is fitted so that a resin pipe 24 having a metal layer 23 on the inner periphery of the resin layer 22 is corrected. The (base end portion) includes a fitting portion 21 that is fitted into and supported by the engagement hole 19 of the main body cylinder portion 12, and the intermediate portion 26 has a pair of annular grooves 28 into which a pair of seal rings 27 are fitted. It is recessed. Between the insertion portion 21 and the intermediate portion 26 of the insert member 20, an engagement step 29 is provided in which the intermediate portion 26 has a diameter larger than that of the insertion portion 21, and the insertion portion 21 of the insert member 20 is the main body cylinder portion 12. The engagement step 29 is brought into contact with the front end surface 12a of the main body cylinder portion 12 when the engagement hole 19 is inserted. This engagement step 29 is a bulging portion 30 that is bulged outward. Further, between the intermediate portion 26 and the taper portion 25 of the insert member 20, a locking step 31 having a slightly smaller diameter on the intermediate portion 26 side than the taper portion 25 side is provided. The guide cylinder portion 39 of the member 37 is locked so that the guide member 37 does not fall off from the outer periphery of the insert member 20.

  The resin pipe 24 having the metal layer 23 is configured, for example, by integrating a cross-linked polyethylene resin layer 22 on the outer periphery of a copper metal layer 23. The metal layer 23 is formed to have a thin thickness of, for example, 0.2 to 0.4 mm, and the resin layer 22 is formed to have a thickness of, for example, 1.5 to 2 mm. Since the resin pipe 24 has the metal layer 23, it is sufficiently reinforced. However, when the resin pipe 24 is cut at a predetermined location, the metal layer 23 is crushed and deformed (see FIG. 7). The deformation of the metal layer 23 is corrected when the resin pipe 24 is inserted into the tapered portion 25 of the insert member 20. The inclination of the tapered portion 25 is set so that the diameter of the distal end portion is 60 to 80% with respect to the diameter of the proximal end portion of the tapered portion 25 in order to effectively correct the deformation of the resin pipe 24. .

  The pair of seal rings 27 is formed in a circular cross section by rubber such as ethylene-propylene-diene copolymer rubber (EPDM), and is in close contact with the inner peripheral surface of the resin pipe 24 and between the outer peripheral surface of the insert member 20 and the resin pipe 24. Water leakage between the inner peripheral surface is prevented and water tightness is achieved. An insertion space 32 into which the resin pipe 24 is inserted is formed between the inner peripheral surface of the engagement cylinder portion 15 and the outer peripheral surface of the insert member 20.

  An annular recess 33 is provided on the inner peripheral surface of the main body cylinder portion 12, and a second seal material 34 made of rubber is fitted into the annular recess 33 as a proximal end side seal material, and the insertion portion 21 of the insert member 20 and the body Watertightness between the inner peripheral surface of the cylindrical portion 12 is achieved. An annular recess 35 is provided on the inner peripheral surface of the intermediate portion of the engagement tube portion 15, and a third seal material 36 made of rubber is fitted into the annular recess 35 as a front end side seal material. Watertightness between the inner peripheral surface and the outer peripheral surface of the resin pipe 24 is achieved.

  As shown in FIGS. 3 and 4, a guide member 37 that is pressed against the distal end surface of the resin pipe 24 and guides insertion of the resin pipe 24 is disposed on the outer periphery of the insert member 20. The guide member 37 is composed of a guide head portion 38 with which the tip of the resin pipe 24 abuts and a cylindrical guide tube portion 39 that covers the outer periphery of the seal ring 27. In this guide member 37, the guide tube portion 39 is formed in a cylindrical shape by a thin plate made of stainless steel, and the guide head portion 38 is folded back (to the guide tube portion 39 side) the inner end portion of the guide tube portion 39. The cross section is formed in an approximately U shape. The corner portion of the guide head 38 having an inverted U-shaped cross section is formed in an arc shape, that is, the guide head 38 is formed in a curved surface shape, and the guide member 37 enters the insertion space 32 of the joint 10 inward. When moving, it can move smoothly. The resin pipe 24 is externally fitted to the guide cylinder portion 39 of the guide member 37, and the resin pipe 24 is inserted into the insertion space 32 in a state where the tip end portion of the resin pipe 24 is in contact with the guide head portion 38 of the guide member 37. It is supposed to be.

  The edge part of the taper part 25 of the insert member 20 becomes the circular arc part 57 formed in the cross-section arc shape, and makes the resin pipe 24 easy to insert. Moreover, the 1st inclined surface 58 is provided in the intermediate peripheral surface of the intermediate part 26 of the insert member 20, and the 2nd inclined surface 59 is provided in the opening end part internal peripheral surface of the insertion part 21, and it reduces the distribution | circulation resistance of water. Thus, water can flow smoothly through the flow hole 18.

  As shown in FIG. 2, when the insert member 20 is not used (during transportation) or when the resin pipe 24 is inserted into the taper portion 25 of the insert member 20, the taper portion 25 side is inserted into the joint body 11. Held in a state. That is, on the side of the insertion portion 21 of the insert member 20, a covered cylindrical cover member 40 having three steps is mounted so as to cover and protect the insertion portion 21 of the insert member 20 and the guide member 37. Yes. That is, the cover member 40 includes a small-diameter cylindrical portion 41 that covers the insertion portion 21 of the insert member 20, a first large-diameter cylindrical portion 43 that is larger in diameter than the small-diameter cylindrical portion 41 and covers the guide member 37, and a tightening nut 47 described later. It is formed in the shape of a covered cylinder provided with the 2nd large diameter cylinder part 45 with which the outer periphery is mounted | worn.

  As shown in FIG. 1, a male screw 46 is threaded on the outer peripheral surface on the distal end side (outer end side) of the engagement tube portion 15, and a female screw 48 of a tightening nut 47 as a tightening member is threaded. The tightening nut 47 is configured to be connected to the engagement cylinder portion 15. In this state, the insert member 20 to which the resin pipe 24 is attached is inserted from the opening 49 at the tip of the tightening nut 47. A retaining ring 50 as a retaining member formed of a metal such as stainless steel is interposed between the outer end surface of the engagement tube portion 15 and the inner peripheral surface (inner end surface) of the tightening nut 47. The resin pipe 24 is prevented from coming off. A retaining piece 50a is formed on the inner peripheral portion of the retaining ring 50 so as to protrude obliquely, and the resin pipe 24 is prevented from slipping out by biting into the outer peripheral portion of the resin pipe 24.

  A split ring 52 is interposed between the retaining ring 50 and the first inclined surface 51 on the inner periphery of the tightening nut 47, and is configured to maintain the inclination angle of the retaining piece 50a. The split ring 52 is formed in a C-ring shape as a whole, and is configured to be able to expand and contract. A second inclined surface 53 having the same inclination angle as the first inclined surface 51 of the tightening nut 47 is provided at the outer end portion of the split ring 52, and the retaining pipe 50 a is interposed by a force in the pulling direction of the resin pipe 24. When the split ring 52 receives a force outward in the axial direction, the split ring 52 is configured to be reduced in diameter. A fastening surface 54 formed on the inner peripheral surface of the split ring 52 tightens the outer peripheral surface of the resin pipe 24. An engagement step 55 is provided on the inner peripheral surface of the split ring 52, and the outer end surface of the guide head portion 38 of the guide member 37 is engaged with the engagement step 55 so that the guide member 37 is prevented from coming off. It has become. As shown in FIG. 4, the spacing between the ends of the split ring 52 having a C-ring shape is connected to be deformable by a leaf spring-like connecting portion 56.

  The engagement cylinder portion 15, the split ring 52, the cover member 40, etc. of the joint body 11 are made of polyacetal (POM), polyphenylene sulfide (PPS), polyphthalamide (PPA), polyphenylsulfone (PPSU), polyamide (PA ) And other synthetic resins (engineering plastics). Moreover, as resin which forms the resin layer 22 of the resin pipe 24 which has the metal layer 23, synthetic resins, such as polyolefin (crosslinked polyethylene, polybutene, etc.), are used, and as a metal which forms the metal layer 23, copper, a copper alloy, Aluminum or the like is used.

  As described above, the joint 10 includes the joint body 11, the insert member 20 that is fitted and supported with the resin pipe 24 mounted in the joint body 11, and the retaining ring 50 that retains and retains the resin pipe 24. The retaining ring 50 is composed of a tightening nut 47 and the like for tightening and fixing the retaining ring 50 to and from the joint body 11.

Next, the operation of the insert member 20 and the joint 10 configured as described above will be described.
As shown in FIG. 5A, the insert member 20 is removed from the joint body 11 with the guide member 37 attached. Then, the tapered portion 25 of the insert member 20 is inserted into the end portion of the resin pipe 24. That is, the resin pipe 24 is inserted into the tapered portion 25. At this time, the end portion of the resin pipe 24 is deformed due to the metal layer 23 being crushed as shown in FIG. 7, but the insert member 20 is struck from the outside of the cover member 40 as shown in FIG. The part 25 is inserted into the resin pipe 24. Thereby, the deformed portion of the metal layer 23 of the resin pipe 24 is slidably contacted with the conical taper portion 25 and gradually corrected, and can be restored to a cylindrical shape.

  As shown in FIG. 5 (c), when the taper portion 25 of the insert member 20 is further inserted into the resin pipe 24, the tip end portion of the resin pipe 24 rides on the guide tube portion 39 of the guide member 37 and is externally fitted. The distal end portion of the resin pipe 24 contacts the guide head portion 38 of the guide member 37. As described above, since the pair of seal rings 27 is covered with the guide tube portion 39 of the guide member 37 while the tip portions of the resin pipe 24 move on the pair of seal rings 27, the metal at the tip portion of the resin pipe 24. There is no risk of damaging the pair of seal rings 27 by the layer 23.

  As shown in FIG. 5D, when the taper portion 25 of the insert member 20 is further inserted into the resin pipe 24, the resin pipe 24 is guided to the guide member 37, and the guide head portion 38 of the guide member 37 is connected to the resin pipe 24. It is pressed by the tip portion and comes into contact with the bulging portion 30 of the insert member 20. Then, as shown in FIG.5 (e), the cover member 40 is removed from the insert member 20 with which the resin pipe 24 was mounted | worn. As described above, since the resin pipe 24 can be inserted without touching the insert member 20 in a state where the cover member 40 is attached to the insert member 20, dust adheres to the outer surface of the insert member 20 such as the fitting portion 21. Can be prevented. Moreover, since the insert member 20 can be inserted into the resin pipe 24 by hitting the cover member 40 from above, the insert member 20 can be prevented from being damaged.

  Subsequently, as shown in FIG. 6A, the fitting portion 21 of the insert member 20 to which the resin pipe 24 is attached is inserted into the joint 10 from the opening 49 of the joint 10. As shown in FIG. 6 (b), when the insertion portion 21 of the insert member 20 is further inserted into the joint body 11, the guide member 37 and the resin pipe 24 pass through the retaining piece 50 a of the retaining ring 50, and then a pair The fitting portion 21 is engaged with the engagement hole 19 of the joint body 11 through the seal ring 27 and the third seal material 36. As shown in FIG. 1, the guide head portion 38 of the guide member 37 simultaneously moves the distal end surface 12 a of the main body cylinder portion 12 until the insertion portion 21 of the insert member 20 hits the inner end wall 19 a of the engagement hole 19 of the joint body 11. The insert member 20 to which the resin pipe 24 is attached is inserted until it hits. In this way, the insertion of the resin pipe 24 is completed, and the resin pipe 24 can be connected to the joint 10.

  In this case, since the front end surface of the guide member 37 is formed in a curved surface shape, the guide member 37 and the resin pipe 24 can smoothly advance through the insertion space 32 of the joint 10. At the same time, the outer peripheral surfaces of the pair of seal rings 27 are slidably contacted with the inner peripheral surface of the resin pipe 24 and compressed, and the third seal member 36 is pressed against the outer peripheral surface of the resin pipe 24 and compressed to form the second seal. The material 34 is pressed against the outer peripheral surface of the insertion portion 21 of the insert member 20 and compressed. Therefore, in a state where the resin pipe 24 is inserted into the joint 10, water is stopped between the insert member 20 and the resin pipe 24 by the pair of seal rings 27, and the engagement cylinder portion 15 and the resin pipe are sealed by the third seal material 36. 24 is stopped, and the second sealing material 34 stops water between the fitting portion 21 of the insert member 20 and the main body cylinder portion 12.

The effects exhibited by the above embodiment will be described collectively below.
-The insert member 20 of this embodiment is provided with the taper part 25 which makes cone shape with a large inclination angle. For this reason, when the resin pipe 24 having the metal layer 23 is fitted and inserted into the taper portion 25 of the insert member 20, the deformed portion of the end portion of the resin pipe 24 is gradually corrected into a cylindrical shape by the taper portion 25, so Inserted. Further, a guide member 37 having a guide cylinder portion 39 covering the outer peripheral portion of the seal ring 27 and a guide head portion 38 with which the resin pipe 24 abuts is provided in the intermediate portion 26 of the insert member 20. For this reason, the resin pipe 24 is guided to the guide member 37, and the end portion of the metal layer 23 is inserted into the insert member 20 without contacting the seal ring 27.

  Therefore, the deformation of the resin pipe 24 having the metal layer 23 can be easily corrected, and the seal ring 27 is not damaged when the resin pipe 24 is inserted, and the seal ring 27 has excellent water tightness. It can be demonstrated.

  A cover member 40 that covers and protects the fitting portion 21 and the guide member 37 when the joint 10 is not used or when the resin pipe 24 is inserted into the tapered portion 25 is provided. For this reason, dust and the like can be prevented from adhering to the insertion portion 21 and the guide member 37, and can be performed by hitting the cover member 40 from above when the resin pipe 24 is inserted into the taper portion 25. 21 scratches can be prevented.

  The cover member 40 is formed in a covered cylinder shape including a small-diameter cylindrical portion 41 that covers the fitting portion 21 and a first large-diameter cylindrical portion 43 that is larger in diameter than the small-diameter cylindrical portion 41 and covers the guide member 37. . For this reason, it is possible to sufficiently protect the cover member 40 without damaging the insertion portion 21 and the guide member 37.

  The guide member 37 has such a length that the guide tube portion 39 covers the pair of seal rings 27. For this reason, when the resin pipe 24 is fitted and inserted, both the seal rings 27 can be sufficiently prevented from being damaged by the metal layer 23 of the resin pipe 24, and the water tightness by the seal ring 27 can be improved.

  The guide member 37 has a guide head portion 38 extending in the outer peripheral direction and is further bent back to be formed in a curved surface shape. Therefore, the structure of the guide member 37 can be simplified and the guide function of the resin pipe 24 can be improved.

-Since the pair of seal rings 27 are fitted in the two annular grooves 28, the water tightness by the seal rings 27 can be further improved.
Since the resin pipe 24 has the copper metal layer 23 on the inner peripheral surface of the resin layer 22, the resin pipe 24 is excellent in physical properties such as strength, durability, and earthquake resistance, and can also exhibit physical properties such as antibacterial properties. .

  The joint 10 includes a cylindrical joint body 11, an insert member 20 that is fitted and supported in a state in which the resin pipe 24 is fitted and inserted into the joint body 11, and a retaining ring that retains and holds the resin pipe 24. 50 and a tightening nut 47 for tightening and fixing the retaining ring 50 to and from the joint main body 11. Therefore, the joint 10 can achieve the effects of the insert member 20, and the resin pipe 24 is inserted into one end portion of the insert member 20, and the insertion portion 21 at the other end is inserted into the joint body 11. The resin pipe 24 can be easily connected to the joint 10 by operation.

In the joint 10 of this embodiment, in addition to the seal ring 27 and the second seal material 34, a third seal material 36 is provided, which is an inner and outer diameter seal method that combines an inner diameter seal method and an outer diameter seal method. Yes. For this reason, the watertight performance of the joint 10 can be improved, and the life of the joint 10 can be extended.
(Second Embodiment)
Next, a second embodiment embodying the present invention will be described. In the second embodiment, portions different from the first embodiment will be mainly described, and the same portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9, when the resin pipe 24 is connected to the joint 10, the fitting portion 21 of the insert member 20 is not in contact with the second sealing material 34 fitted in the annular recess 33 of the main body cylinder portion 12. In this state, the insertion of the resin pipe 24 may be stopped while the guide head portion 38 of the guide member 37 is in contact with the third seal member 36 fitted into the annular recess 35 of the engagement cylinder portion 15. At that time, a certain level of watertightness is expressed by contact between the guide head portion 38 of the guide member 37 and the third seal member 36, but the watertightness is insufficient and the watertightness is maintained for a long time. I can't.

  Therefore, in the second embodiment, as shown in FIGS. 10A and 10B, the portion 38 a of the guide member 37 that is folded back to the back of the guide head 38 has an axial direction of the guide member 37. A groove 60 having a semicircular cross section extending in the direction is provided. The groove 60 is provided at three positions at equal intervals in the circumferential direction of the portion 38a folded back. The groove 60 is formed at the same time when the portion 38a folded back to the rear of the guide member 37 is formed by press working.

Then, as shown in FIG. 9, the resin pipe 24 is inserted into the joint 10, whereby the insertion portion 21 of the insert member 20 is in a non-contact state with the second seal material 34, and the guide head portion 38 of the guide member 37. Is brought into contact with the third sealing material 36. At this time, since the groove 60 is provided in the portion 38a folded back to the rear of the guide member 37, the guide head portion 38 of the guide member 37 and the third seal member 36 are in a non-watertight state. . For this reason, when the pressure resistance test is performed after the resin pipe 24 is connected to the joint 10, water leakage occurs from the groove 60 of the guide head 38, and an abnormality can be detected. Therefore, it can be recognized that the insertion of the insert member 20 to the joint body 11 is insufficient.
(Third embodiment)
Next, a third embodiment embodying the present invention will be described. Also in the third embodiment, portions different from the first embodiment will be mainly described, and the same portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 12, when the resin pipe 24 is connected to the joint 10, the insertion portion 21 of the insert member 20 reaches the second seal material 34 and is in contact with the guide head portion 38 of the guide member 37. The insertion of the resin pipe 24 may be stopped while being in contact with the three sealing material 36. At that time, the fitting portion 21 of the insert member 20 and the second seal material 34 come into contact with each other to develop water tightness. However, when the guide head 38 of the guide member 37 and the third seal material 36 are brought into contact with each other, the original water tightness is obtained. The water-tightness decreases over time.

  However, in the third embodiment, as shown in FIG. 11, the guide member 37 is externally fitted to the insert member 20, and the insertion portion of the insert member 20 is inserted in the state where the resin pipe 24 is fitted to the guide member 37. 21 is inserted into the main body cylinder portion 12, and the fitting portion 21 comes into contact with the second sealing material 34. At this time, the distance L between the front end of the insertion portion 21 of the insert member 20 and the rear end portion of the portion 38a folded back to the back of the guide member 37 is determined by the second sealing material 34 and the third sealing material in the joint body 11. It is set to be equal to the distance D to 36. That is, when the insertion portion 21 of the insert member 20 comes into contact with the second sealing material 34, the tip of the resin pipe 24 positioned at the rear end portion of the portion 38 a folded back to the rear of the guide member 37 is the third sealing material 36. To come into contact. The distance D between the second sealing material 34 and the third sealing material 36 is set with reference to the axial center portion of the second sealing material 34 and the axial center portion of the third sealing material 36. As long as the water tightness between the resin pipe 24 and the third sealing material 36 is expressed, the third sealing material 36 can be set within the range of the length in the axial direction thereof.

  In this way, the insertion portion 21 of the insert member 20 contacts the second seal material 34 and the tip of the resin pipe 24 contacts the third seal material 36. Therefore, even when the insertion of the insert member 20 is insufficient, the water-tightness between the tip of the insertion portion 21 of the insert member 20 and the second seal member 34, the tip of the resin pipe 24, and the third seal member 36 can be obtained, and the original water tightness can be exhibited.

In addition, the said embodiment can also be changed and actualized as follows.
As shown in FIG. 8, a three-layer pipe having a metal layer 23 formed of aluminum or the like between an inner resin layer 22a and an outer resin layer 22b formed of crosslinked polyethylene or the like is used as the resin pipe 24. You can also. In this case, when the resin pipe 24 is fitted on the guide tube portion 39 of the guide member 37 and the end of the resin pipe 24 hits the guide head portion 38, the metal layer 23 is positioned in the space in the guide head portion 38. Therefore, electrical insulation can be achieved.

○ In the cover member 40, the first large-diameter cylindrical portion 43 is omitted, the second large-diameter cylindrical portion 45 is extended to that portion, and the two steps of the small-diameter cylindrical portion 41 and the second large-diameter cylindrical portion 45 are provided. It can also be configured.
O Two annular grooves 28 can be combined into one and the seal ring 27 can be combined into one. Alternatively, the number of the annular grooves 28 may be three or more, and the number of the seal rings 27 may be three or more. Further, the width of the annular groove 28 can be increased, and the seal ring 27 can be formed in an elliptical cross section.

  The guide member 37 can be colored, and in that case, the color can be recognized through the engagement tube portion 15 and the insertion of the resin pipe 24 into the joint 10 can be easily confirmed.

〇 The joint 10 can be used to connect floor heating pipes, load heating pipes, etc. in addition to water pipes and cold / hot water pipes.
In 2nd Embodiment, the groove | channel 60 provided in the part 38a folded back to the back of the guide member 37 should just be provided in at least 1 place, and a cross-sectional V shape, a cross-sectional U-shape, etc. The shape may also be

Further, the technical idea that can be grasped from the embodiment will be described below.
The joint according to any one of claims 1 to 6, wherein a locking step for locking the guide tube portion of the guide member is provided in an intermediate portion of the insert member. Insert member used for. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-6, it can prevent a guide member from dropping out from an insert member.

  The insert member according to claim 6, wherein the grooves are a plurality of grooves extending in the axial direction of the guide member. In this case, in addition to the effect of the invention according to claim 6, water leakage in the pressure resistance test can be easily achieved.

  The distance between the second seal material and the third seal material is set with reference to the axial center portion of the second seal material and the axial center portion of the third seal material. 8. The joint according to 8. In this case, the effect of the invention according to claim 8 can be further improved.

  DESCRIPTION OF SYMBOLS 10 ... Joint, 11 ... Joint main body, 20 ... Insert member, 21 ... Insertion part, 23 ... Metal layer, 24 ... Resin pipe, 25 ... Tapered part, 26 ... Middle part, 27 ... Seal ring, 28 ... Circular groove, 34 2nd sealing material as a proximal end side sealing material, 36 ... 3rd sealing material as a distal end side sealing material, 37 ... Guide member, 38 ... Guide head, 38a ... Part folded back, 39 ... Guide Tube part: 40 ... Cover member, 41 ... Small diameter cylinder part, 43 ... First large diameter cylinder part as large diameter cylinder part, 50 ... Retaining ring as retaining member, 60 ... Groove, L ... Distance, D ... distance.

Claims (8)

One end portion is provided with a taper portion into which a resin pipe having a metal layer is inserted so that the deformation is corrected, and the other end portion is provided with an insertion portion that is inserted into and supported by a joint body constituting the joint. , An insert member having an annular groove in which a seal ring is fitted in the middle part,
A guide member having a guide tube portion on which an outer periphery of the seal ring is fitted with a resin pipe, and a guide head portion which is in contact with an end portion of the resin pipe and guides the insertion of the resin pipe into the insert member. And an bulging portion with which the guide head of the guide member is engaged is provided between the insertion portion and the intermediate portion of the insert member. The insert member used for a joint according to claim 1, further comprising a cover member that covers and protects the fitting portion and the guide member when the joint is not used or when the resin pipe is inserted into the tapered portion. . The said cover member is formed in the covered cylinder shape provided with the small diameter cylinder part which covers an insertion part, and the large diameter cylinder part which is diameter-expanded from this small diameter cylinder part and covers a guide member. An insert member used for the described joint. The insert member used for the joint according to any one of claims 1 to 3, wherein the guide member has a length in which the guide tube portion covers the seal ring. The joint according to any one of claims 1 to 4, wherein the guide member is formed in a curved surface shape with a guide head portion extending outwardly and further folded back. Insert member used. The guide head of the guide member is provided with a groove in a portion that is folded back, and the groove is brought into a non-watertight state when the guide head comes into contact with a tip side sealing material provided in the joint body. The insert member used for the joint according to claim 5, wherein the insert member is provided. A joint body having a cylindrical shape, and the insert member according to any one of claims 1 to 6, wherein the resin pipe is fitted and supported in the joint body, and the resin pipe is prevented from coming off. A joint comprising: a retaining member to be held; and a tightening member for tightening and fixing the retaining member between the joint body and the joint body. Resin pipe located at the rear end of the portion where the insert member is fitted into the joint body, and the tip of the fitting portion contacts the proximal seal material in the joint body and is turned back to the back of the guide member The distance between the tip of the insertion portion of the insert member and the rear end of the portion that is folded back to the back of the guide member is The joint according to claim 7, wherein the joint is set to be equal to a distance between the sealing material and the tip side sealing material.

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