JP5551039B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a pipe joint used for connecting, for example, a composite pipe including an inner layer and an outer layer made of a thermoplastic resin, and a metal intermediate layer.

As a one-touch type pipe joint that completes connection and water stop with one touch, it has a nozzle part (also called nipple part) that enters the connection pipe when connected, and the outer diameter of the annular groove formed on the outer periphery of the nozzle part is larger than the nozzle part A ring-shaped sealing material is fitted, and by connecting the connecting pipe, the ring-shaped sealing material is in close contact with the inner peripheral surface of the connecting pipe in a watertight manner and connected by a retaining means such as a retaining ring provided at the joint inlet. There is one that can prevent the tube from coming off with one touch.
In the above-mentioned one-touch type pipe joint, the connecting pipe to be connected is cut to a desired length at the piping construction site, subjected to terminal treatment such as chamfering work on the inner and outer surfaces of the pipe end, and then connected to the pipe joint. However, some workers perform connection work without observing the work standard and without performing terminal processing.
However, in the case of conventional pipe fittings, the end treatment is not performed accurately. Especially when trying to connect the connecting pipe to the pipe joint while cutting diagonally, the tip of the connecting pipe gets caught in the ring-shaped sealing material and damages the ring-shaped sealing material. Or may be removed from the annular groove to prevent water stoppage.

  Therefore, in order to solve the above-described problem, a pipe joint (Patent Document 1) in which the pipe end of the connection pipe is not contacted with the ring-shaped sealing material, or a nozzle part and the nozzle part are provided so as to surround the circumference. A guide ring made of resin is provided at the inlet of the insertion space of the connection pipe provided between the outer cylinder and the guide ring. The guide ring receives the pipe end of the connection pipe by this guide ring, and the guide ring is pushed in as the connection pipe is pushed. Move along the pipe end face of the connecting pipe to the rear end side of the nozzle, so that the pipe end of the connecting pipe hits the ring-shaped sealing material and the ring-shaped sealing material is not damaged or detached. A pipe joint (Patent Document 2) has been proposed (Patent Document 2).

Japanese Patent No. 3600764 JP 2010-101477 A

However, in the case of the pipe joint described in Patent Document 1, in order to make the wall thickness as thin as possible, a press-molded product such as iron or copper alloy is used as a guide member. When a composite pipe having an inner layer and an outer layer made of aluminum and an aluminum layer as an intermediate layer is used, there are the following problems.
That is, in the composite pipe, since the aluminum of the intermediate layer is exposed at the pipe end, when the intermediate layer and the guide member are in contact with each other, and water exists between them, the aluminum causes contact corrosion between different metals, There is a risk of water leakage.

  On the other hand, in the case of the pipe joint described in Patent Document 2, the guide ring is made of resin and cannot be formed into a thin wall like metal, so that the guide ring is thick at the end of the connecting pipe. It has a structure that pushes in. Therefore, depending on the cutting state of the pipe end of the connection pipe, the problem of preventing the ring-shaped sealing material from being damaged by the edge of the pipe end cannot be completely solved.

  In view of the above circumstances, the present invention can normally connect a composite pipe with one touch without damaging or removing the ring-shaped sealing material even in a state where normal pipe end processing is not performed. An object of the present invention is to provide a pipe joint in which contact between a metal intermediate layer of a composite pipe and a guide member is reliably prevented, and contact corrosion between different metals in the intermediate layer can be prevented.

In order to achieve the above object, a pipe joint according to the present invention includes a joint body having a nozzle part that is inserted into a composite pipe having an inner layer and an outer layer made of a thermoplastic resin and a metal intermediate layer when connected, A ring-shaped sealing material fitted in an annular groove provided in the nozzle portion; and a metal guide member having a guide tube portion mounted so as to surround the ring-shaped sealing material, and the composite pipe the as the plug toward the rear end from the nozzle tip, said after the guide tube portion in the composite tube becomes fitted state, the further incorporated press composite pipe toward the rear end side of the nozzle portion, said guide member, with the push of a composite pipe moves to the rear end of the nozzle portion, the ring-like seal member is a pipe joint which is adapted to contact watertight on the inner peripheral surface of the composite tube, the guide The member is the edge of the inner layer of the composite pipe Receiving includes a non-contact state holding means for holding the non-contact state with respect to the metallic intermediate layer guide member which is exposed to the pipe end of the composite pipe, the nozzle portion, the composite pipe is fitted to the normal position of the nozzle portion Then, a detent protrusion or protrusion that prevents the moved guide member from returning to the ring-shaped sealing material side is provided .

In the present invention, the composite tube is not particularly limited, and the inner layer and the outer layer may be a multilayer, or the inner layer and the outer layer may be formed of different thermoplastic resins. For example, commercially available products such as Sulsui Chemical Co., Ltd. made by Sekisui Chemical Co., Ltd., in which the outer layer is made of high-density polyethylene, the inner layer is made of heat-resistant polyethylene, and the intermediate layer is made of aluminum, can be used.
Moreover, in this invention, the front-end | tip of a nozzle part means the starting end when inserting in a composite pipe.

The guide member is not particularly limited, but is preferably as thin as possible. Examples thereof include those formed by pressing, drawing and bending a thin pipe made of steel or copper alloy.
The structure in which the guide member is held in a non-contact state with the metal intermediate layer of the composite tube is not particularly limited as long as the object can be achieved. For example, the guide member gradually gradually moves from the nozzle portion rear end side to the nozzle portion rear end direction. A taper portion that expands in diameter is provided, and the taper portion receives only the inner layer of the composite tube, and a protrusion or protrusion that rises to a height equal to or less than the thickness of the inner layer of the composite tube. A structure that receives only the inner layer of the tube, a structure in which the tip of the guide tube portion is folded back into a substantially U-shaped cross section, and a tip of the turn-up portion contacts only the outer layer of the composite tube. Alternatively, a structure in which a synthetic resin cover is provided and only the rubber packing or the synthetic resin cover abuts against the pipe end surface of the composite pipe may be used.

  Further, the guide member is not particularly limited, but the guide tube portion gradually decreases in diameter toward the tip of the nozzle portion at least on the tip end side of the guide tube portion, and the minimum outer diameter is smaller than the inner diameter of the composite tube. It is preferable to provide a reduced diameter cylindrical portion having a small diameter. That is, the guide tube portion is smoothly fitted to the tube end portion of the composite tube while being guided by the reduced diameter tube portion. Therefore, even when it is inserted obliquely, the composite tube can be easily inserted to the normal position.

  The nozzle portion is not particularly limited. For example, when the composite tube is fitted to the normal position of the nozzle portion, a detent protrusion or protrusion that prevents the moved guide member from returning to the ring-shaped sealing material side. It is preferable that a strip is provided. That is, even when a force in the pulling direction is applied to the connected composite pipe, and the composite pipe tries to move in the pulling direction, the edge of the guide member on the tip side of the nozzle part (hereinafter referred to as “the rear end of the guide cylinder part”) Is locked to the detent protrusion or protrusion, and only the composite tube moves in the direction of removal. Therefore, the ring-shaped sealing material is not damaged or detached at the rear end of the guide tube portion.

As described above, the pipe joint according to the present invention includes a joint main body having a nozzle part that is inserted into a composite pipe having an inner layer and an outer layer made of a thermoplastic resin and a metal intermediate layer when connected, and the nozzle part A ring-shaped sealing material fitted in an annular groove provided on the metal, and a metal guide member having a guide tube portion mounted so as to surround the ring-shaped sealing material. with the plug toward the rear end from the front end, after said guide tube portion in the composite tube becomes fitted state, the further incorporated press composite pipe toward the rear end side of the nozzle portion, said guide member, with the push of a composite pipe moves to the rear end of the nozzle portion, the ring-like seal member is a pipe joint which is adapted to contact watertight on the inner peripheral surface of the composite tube, said guide member, Composite by receiving the edge of inner layer of composite pipe Includes a non-contact state holding means for maintaining the metallic intermediate layer exposed to the tube end in a non-contact state with respect to the guide member, the nozzle portion, when the composite tube is fitted to the normal position of the nozzle portion, Since it has a detent protrusion or protrusion that prevents the moved guide member from returning to the ring-shaped seal material side , the ring-shaped seal material can be damaged or removed even when normal pipe end treatment is not performed. A normal connection can be achieved with a single touch without ringing, and contact between the metal intermediate layer of the composite tube and the guide member can be reliably prevented, thereby preventing contact corrosion between different metals.

It is sectional drawing showing one embodiment of the pipe joint concerning this invention. It is sectional drawing of the state which connected the composite pipe to the pipe joint of FIG. It is an expanded sectional view of the ring-shaped sealing material part of the pipe joint of FIG. It is sectional drawing of the guide member of the pipe joint of FIG. It is sectional drawing of the retaining ring of the pipe joint of FIG. It is sectional drawing showing the state in the middle of inserting a composite pipe in the pipe joint of FIG. It is an expanded sectional view of the nozzle part rear end part in the connection state of the composite pipe | tube of FIG. It is an expanded sectional view of the latching claw part explaining the effect | action of the retaining ring latching claw when the force of a drawing direction is added to the composite pipe connected to the pipe joint of FIG. It is sectional drawing explaining the effect | action of a retaining ring when the force of the big pulling direction is added to the composite pipe connected to the pipe joint of FIG. It is a side view showing the modification of the guide member of the pipe joint of FIG. It is sectional drawing of the guide member of FIG.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
FIG. 1 shows one embodiment of a pipe joint according to the present invention.

As shown in FIG. 1, the pipe joint A includes a joint body 1, an outer cylinder member 2, a cap member 3, a ring-shaped sealing material 4, a retaining ring 5, and a guide member 6a. As shown in FIG. 2, the composite pipe 9 is connected.
The composite tube 9 includes an outer layer 91 made of high-density polyethylene, an inner layer 92 made of heat-resistant polyethylene, and an intermediate layer 93 made of aluminum.

  The joint body 1 is formed of a metal material such as gun metal or stainless steel, and includes a hexagonal nut-like flange portion 1a that engages with an engaging portion of a tightening tool (not shown) such as a spanner at the center. A male screw cylinder 1b is provided on one side of the part 1a, and an outer cylinder receiving part 1c and a nozzle part 1d are provided on the other side.

The nozzle portion 1d includes an insertion guide portion 10, a first annular groove 11, a second annular groove 12, a third annular groove 13, and a detent ridge 14 on the peripheral surface from the distal end side, and a maximum diameter portion is connected. The diameter is slightly smaller than the inner diameter of the composite tube 9.
The insertion guide portion 10 has a taper surface whose outer diameter gradually decreases toward the tip of the nozzle portion 1d at an angle of about 30 degrees, and the outer diameter of the tip of the composite tube 9 described later is cut. Even if flattened, the diameter is smaller than the minimum inner diameter of the tube end of the flattened composite tube 9 in the normally expected flattening rate range (70 to 75%).

The 1st annular groove 11 is provided in the position which faces the retaining ring 5 mentioned later.
As shown in FIG. 3, the second annular groove 12 is provided so that a reduced-diameter cylindrical portion 61b of a guide member 6a, which will be described later, is fitted therein, and its bottom surface gradually contracts toward the tip side of the nozzle portion 1d. The diameter is a tapered surface, and the rear end side of the nozzle portion 1 d is connected to the third annular groove 13.
The third annular groove 13 is formed so that the positioning protrusion 13a of the ring-shaped sealing material 4 is annular with respect to the central axis of the nozzle portion 1d slightly closer to the insertion end of the nozzle portion 1d than the central portion in the central axis direction of the nozzle portion 1d on the bottom surface In preparation.

The detent ridge 14 is provided along the side wall of the third annular groove 13 on the nozzle portion 1d side, and the height thereof is engaged with the rear end of the guide member 6a so that the insertion end of the nozzle portion 1d is inserted. If the movement to the side can be suppressed, it is preferably low, and is about 0.05 mm.
The outer cylinder receiving portion 1c is provided between the nozzle portion 1d and the flange portion 1a, has a slightly larger diameter than the nozzle portion 1d, and an engagement protrusion 21 of the outer cylinder member 2 described later on the peripheral surface thereof. An engagement groove 15 is formed to engage with.

The ring-shaped sealing material 4 is formed of a synthetic rubber such as EPDM (ethylene-propylene-diene copolymer), and as shown in FIG. 3, a main body portion 41, a first seal portion 42, and a second seal. Part 43.
The main body 41 is slightly narrower than the length of the third annular groove 13 in the central axis direction of the nozzle, and the thickness thereof is substantially the same as or slightly thinner than the length from the bottom of the third annular groove 13 to the outer edge of the nozzle 1d. When the engaging groove 41a in which the positioning protrusion 13a is fitted on the inner peripheral surface of the cylinder is annularly provided on the inner peripheral surface of the cylinder and no compression force is applied from the outer periphery, the third annular groove 13 is formed. In the fitted state, a gap S serving as a clearance space during compression is formed between the third annular groove 13 and the wall on the rear end side of the nozzle portion and between the wall on the second annular groove 12 side. It is like that.

The first seal portion 42 is provided on the front end side of the nozzle portion with respect to the engagement groove 41a, and the cross section gradually increases in diameter from the front end side to the rear end side of the nozzle portion 1d as indicated by a broken line in FIG. It has a substantially triangular shape, and its maximum diameter is larger than the inner diameter of the composite tube.
The second seal portion 43 is provided on the rear end side of the nozzle portion with respect to the engagement groove 41a. As shown in FIG. 3, the second seal portion 43 has a substantially semi-cylindrical cross section, and its maximum diameter is larger than the inner diameter of the composite pipe. ing.

The guide member 6a is formed by pressing, drawing and bending a pipe made of a thin stainless steel or copper alloy having a thickness of about 0.1 mm, as shown in FIG. A tapered portion 62 as a non-contact state holding structure and a flange portion 63 are provided.
The guide tube portion 61 includes a tube portion main body 61a and a reduced diameter tube portion 61b.

The cylinder main body 61 a has a cylindrical shape whose outer diameter is substantially the same as or slightly smaller than the inner diameter of the composite pipe 9.
The reduced diameter cylindrical portion 61b is connected to the distal end side of the nozzle portion 1d of the cylindrical portion main body 61a, gradually decreases in diameter toward the distal end side of the nozzle portion 1d, and the outer diameter on the distal end side of the nozzle portion 1d is combined. The diameter is about 5% smaller than the inner diameter of the tube 9.

  The taper portion 62 is provided so as to gradually increase in diameter from the rear end side of the nozzle portion 1d of the cylindrical portion main body 61a toward the rear end direction of the nozzle portion 1d, and the taper angle is 15 to 45 degrees. Although not particularly limited, it is preferably close to the angle of chamfering or chamfering of the pipe end face, and in this embodiment, it is 30 degrees.

  The flange 63 is formed by bending and polymerizing the end of the pipe, and the outer diameter thereof is slightly smaller than the outer diameter of the composite pipe 9.

As shown in FIGS. 1 to 3, the initial position of the guide member 6a is such that the guide tube portion 61 is externally fitted to the first seal portion 42 and the distal end side of the nozzle portion 1d of the reduced diameter tube portion 61b. The end portion is mounted so as to fit into the second annular groove 12, and the flange portion 63 is disposed in front of the second seal portion 43. Due to this arrangement, it does not move against shock and vibration.
In the state where the guide member 6 a is mounted, the ring-shaped sealing material 4 is in a state where the first seal portion 42 is compressed by the guide tube portion 61.

The outer cylinder member 2 is a cylindrical body formed of a transparent engineering plastic such as PPS (polyphenylene sulfide), PPSU (polyphenylsulfone), PC (polycarbonate), etc., and is engaged with the inner peripheral surface of one end. After the protrusion 21 is provided and the other end side is once bulged outward and becomes thick, the outer peripheral surface is notched, and two engagement grooves 22 and 22 are formed in the notch. .
In addition, the outer cylinder member 2 has an inner diameter that is substantially the same as or slightly larger than the outer diameter of the composite tube 9, and the inner peripheral surface of the outer peripheral surface is expanded in a stepped manner from the other portion. An enlarged diameter portion 23 is provided.
A retaining ring positioning recess 24 is provided in a ring shape on the end surface of the outer cylindrical member 2 on the distal end side of the nozzle portion 1d so as to follow the shape of a main body 51 of a retaining ring 5 described later.

The outer cylinder member 2 is fitted on the outer cylinder receiving portion 1c so that one end thereof is engaged with the engaging groove 15 of the outer cylinder receiving portion 1c. ing.
That is, the outer cylinder member 2 is detached from the joint body 1 when the engagement protrusion 21 is pushed in the direction of the joint body 1 while being elastically deformed, and the engagement protrusion 21 is engaged with the engagement groove 15. Instead, it is rotatably attached to the joint body 1.

The retaining ring 5 is formed by punching a stainless steel thin plate material and being bent. The ring-shaped main body 51, a plurality of locking claws 52 on the inner peripheral side of the main body 51, a biting restriction portion 53, Are provided alternately.
The main body 51 has a ring shape whose inner diameter is substantially the same as the inner diameter of the enlarged diameter portion 23 and whose outer diameter is smaller than the outer diameter of the other end surface of the outer cylinder member 2 (the end surface on the tip side of the nozzle portion 1d). It has become.
As shown in FIG. 5, the locking claw 52 is provided so as to be inclined to one side at an angle of 40 to 45 ° with respect to the main body 51.

The biting restriction portion 53 is formed so that the plate material overlaps with the main body 51 on both sides of the locking claw 52 after standing up at the same angle as the locking claw 52 and then bent 180 degrees outward.
Further, the biting restriction portion 53 has a length from the main body 51 to the tip thereof that is shorter than the length from the main body 51 to the tip of the locking claw 52 by the thickness of the outer layer 91 of the composite pipe 9.

  The retaining ring 5 is held in a state in which the main body 51 is fitted into the retaining ring positioning recess 24 and the locking claw 52 and the biting restriction portion 53 are accommodated in the enlarged diameter portion 23.

The cap member 3 includes a cap body 31 formed of a transparent engineering plastic such as PPS (polyphenylene sulfide), PPSU (polyphenylsulfone), PC (polycarbonate), and a fitting cylinder portion 32.
The cap body 31 has an inner diameter on the tube insertion end side that is substantially the same as or slightly larger than the outer diameter of the composite tube 9, and extends from the intermediate portion to the tip (the end opposite to the fitting tube portion 32). It has.
The guide portion 31a has a tapered surface whose inner diameter gradually increases toward the tip of the cap body 31 at an angle of about 30 degrees, and the inner diameter of the tip is flat when the composite tube 9 described later is cut. Even in this case, the diameter is larger than the maximum outer diameter at the end of the flattened composite pipe 9 in the normally expected flatness range (70 to 75%).

The fitting cylinder portion 32 is provided so as to extend to one side in the thickness direction of the cap body 31, and two engagement protrusions 32a and 32a are provided on the inner peripheral surface.
The cap member 3 is fitted onto the outer cylinder member 2 so that the engagement protrusions 32a and 32a are fitted into the engagement grooves 22 and 22 of the outer cylinder member 2, respectively. The removal of the retaining ring 5 is prevented.

This pipe joint A is as described above, and the composite pipe 9 is connected by one-touch insertion as follows.
First, after the male threaded cylinder portion 1b of the joint body 1 is screwed into a piping material (for example, a header) not shown and connected to another piping material, the composite pipe 9 is opened from the opening of the cap member 3 to the joint body. When inserted into the first side, the tip of the composite tube 9 is elastically deformed in the direction in which the locking claw 52 and the biting restriction portion 53 of the retaining ring 5 are first inserted, so that the locking claw 52 as shown in FIG. In addition, the biting restriction portion 53 extends along the outer wall of the composite pipe 9.

When the composite tube 9 is further pushed in, as shown in FIG. 6, the outer diameter at the tip of the reduced diameter cylindrical portion 61b is smaller than the inner diameter of the composite tube 9, so that the tapered diameter reduced portion 61b is tapered. While being guided by the surface, the tube body 61a smoothly enters the tip of the composite tube 9, the entire guide tube portion 61 enters the composite tube 9, and is received by the tapered portion 62 at the tip of the inner layer 92 of the composite tube 9. .
When the composite pipe 9 is further pushed in, the tapered portion 62 is pushed by the inner layer 92 of the composite pipe 9, and the guide member 6a is inserted into the nozzle portion rear end side together with the composite pipe 9, as shown in FIGS. As shown in FIG. 7, the flange 63 comes into contact with the end surface of the outer tube receiving portion 1 c, and the guide tube portion 61 enters the nozzle portion rear end side from the detent protrusion 14. Further, the first seal portion 42 and the second seal portion 43 of the ring-shaped sealing material 4 are in close contact with the inner peripheral surface of the composite pipe 9 in a watertight manner.

This pipe joint A is as described above, and has the following excellent effects.
(1) Since the guide member 6 a is provided, the pipe end of the composite pipe 9 does not hit the ring-shaped sealing material 4. Therefore, even if the composite pipe 9 is inserted into the pipe joint A in a state where the tip is obliquely cut or the finish of the pipe end face is insufficient, the ring-shaped sealing material 4 is not damaged or detached.
(2) A tapered portion 62 is provided as a non-contact state holding means, and as shown in FIG. 7, the end surface of the inner layer 92 of the composite pipe 9 is received by the tapered portion 62, and the intermediate layer 93 contacts the guide member 6a. There is nothing to do. Therefore, deterioration of the intermediate layer 93 due to contact corrosion between different metals is prevented.
(3) Since the guide member 6a includes the reduced diameter cylindrical portion 61b, the guide cylindrical portion 61 smoothly enters the tube end of the composite tube 9.
(4) Since the retaining ring 5 is provided, the composite tube 9 can be reliably prevented from coming off. That is, when a force in the pulling direction is applied to the composite tube 9 and the composite tube 9 tries to move in the pulling direction, first, the locking claw 52 bites into the outer layer 91 of the composite tube 9 as shown in FIG. When the force is not large, the movement in the pulling direction is suppressed only by this biting. Then, when the applied force is large, as shown in FIG. 9, as the composite tube 9 moves in the pulling direction, the latching claw 52 that bites into the outer layer 91 rises in parallel with the main body 51, By the biting restriction portion 53, the tube wall of the composite tube 9 is reduced in diameter in the direction of the nozzle portion 1d, enters the first annular groove 11 of the nozzle portion 1d, and is prevented from further slipping out.
(5) Since the nozzle portion 1d is provided with the detent protrusion 14, a force in the removal direction is applied to the composite tube 9 as described above, the composite tube 9 moves in the removal direction, and the guide member 6a is displaced. Even if trying to do so, the tip of the reduced diameter cylindrical portion 61 b of the guide member 6 a is locked to the detent protrusion 14. Therefore, the guide member 6a is not further displaced in the removal direction, and the ring-shaped sealing material 4 is not damaged or detached by the tip of the reduced diameter cylindrical portion 61b.
(6) Since the retaining ring 5 includes the biting restriction portions 53 on both sides of the locking claw 52, when the locking claw 52 bites into a predetermined position, the biting restriction portion 53 touches the outer wall surface of the composite pipe 9. In contact therewith, the further engagement of the locking claw 52 into the outer layer 91 is prevented. Therefore, the locking claw 52 does not break through the outer layer 91 and reach the intermediate layer. That is, contact corrosion between different metals due to direct contact between the intermediate layer 93 and the retaining ring 5 can be prevented.
(7) The insertion guide portion 10 has a tapered surface in which the outer diameter gradually decreases toward the tip of the nozzle portion 1d at an angle of about 30 degrees, and the outer diameter of the tip is flat with the cut. The guide tube 31a has a tapered surface whose inner diameter gradually increases toward the tip of the cap body 31 at an angle of about 30 degrees. In addition, since the inner diameter of the tip is larger than the maximum outer diameter of the tube end of the flattened composite tube 9 that has been cut, the composite tube 9 is flattened at the time of cutting, and in this state the composite tube Even when 9 is connected, the insertion guide portion 10 smoothly enters the distal end portion of the composite tube 9, and the composite tube 9 enters the cap body 31 from the distal end of the guide 31a. The flattened composite tube 9 is corrected to a cylindrical body by the insertion guide portion 10 and the guide portion 31a, and is smoothly fitted on the guide tube portion 61 of the guide member 6a.
(8) Since the ring-shaped sealing material 4 is pressed by the guide cylinder portion 61 of the guide member 6a, the resistance when passing through the ring-shaped sealing material 4 of the composite tube 9 is reduced, and the insertion force of the composite tube is reduced. Can be reduced. Therefore, the workability is improved.

10 and 11 show a modification of the guide member of the pipe joint according to the present invention.
As shown in FIGS. 10 and 11, the guide member 6b has a guide tube portion 64 that gradually decreases in diameter from the taper portion 62 side toward the other end, and the maximum outer diameter of the guide tube portion 64 is composite. It is substantially the same as or slightly larger in diameter than the inner diameter of the tube 9, and is the same as the guide member 6a except that the tapered portion 62 includes three locking portions 65 as non-contact state holding means. Yes.

That is, the locking portion 65 is provided by recessing a part of the wall surface of the taper portion 62 in the direction of the guide tube portion 61 from the flange portion 63 side, and the taper portion 62 side of the guide tube portion 64 of the lock portion 65. Further, the height h from the edge is equal to or less than the thickness of the inner layer 92 of the composite tube 9.
Therefore, according to this guide member 6b, since the end face of the inner layer 92 of the inserted composite pipe 9 is received by the locking portion 65, the intermediate layer 93 of the composite pipe 9 does not contact the guide member 6b.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, there is one ring-shaped sealing material. However, a plurality of annular grooves for sealing material are provided in parallel to the axial direction, and a ring-shaped sealing material is fitted to each. I do not care.
In the above embodiment, the composite pipe is connected, but this pipe joint may be used to connect a resin pipe such as a crosslinked polyethylene pipe or a polybutene pipe.

A Pipe joint 9 Composite pipe 91 Outer layer 92 Inner layer 93 Intermediate layer 1 Joint body 1d Nozzle part 13 Third annular groove 14 Detent protrusion 4 Ring-shaped sealing material 6a, 6b Guide member 61 Guide tube part 61a Tube part body 61b Reduced diameter Tube part 62 Taper part (non-contact state holding means)
64 Guide tube portion 65 Locking portion (non-contact state holding means)

Claims (4)

A joint body having a nozzle portion that is inserted into a composite pipe having an inner layer and an outer layer made of thermoplastic resin and a metal intermediate layer when connected;
A ring-shaped sealing material fitted in an annular groove provided in the nozzle portion;
A metal guide member having a guide tube portion mounted so as to surround the ring-shaped sealing material,
Along with inserting the composite tube toward the rear end from the nozzle tip, said after the guide tube portion in the composite tube becomes fitted state, the further incorporated press composite pipe toward the rear end side of the nozzle portion , the guide member, with the push of a composite pipe moves to the rear end of the nozzle portion, the ring-like seal member is a pipe joint which is adapted to contact watertight on the inner peripheral surface of the composite pipe ,
The guide member includes non-contact state holding means for receiving the edge of the inner layer of the composite tube and keeping the metal intermediate layer exposed at the tube end of the composite tube in a non-contact state with respect to the guide member ,
The nozzle portion includes a detent protrusion or a protrusion that prevents the moved guide member from returning to the ring-shaped sealing material side when the composite tube is fitted to the normal position of the nozzle portion. Pipe fittings.   The pipe joint according to claim 1, wherein the non-contact state holding means of the guide member is a tapered portion that gradually increases in diameter from the end portion of the guide tube portion and receives only the inner layer of the composite tube.   The pipe joint according to claim 1, wherein the non-contact state holding means of the guide member is a protrusion or a protrusion that rises to a height equal to or less than the thickness of the inner layer of the composite pipe. The pipe joint according to any one of claims 1 to 3 , wherein the guide cylindrical portion of the guide member includes a reduced diameter cylindrical portion that decreases in diameter toward a distal end direction of the nozzle portion on a distal end side of the guide cylindrical portion. .

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