JP2008025615A - Pipe joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pipe joint having improved working efficiency in use while preventing separation due to the looseness of a cap nut when not in use during carriage or storage. <P>SOLUTION: The pipe joint comprises a joint body having a nozzle part to which a connection pipe is externally fitted and a male screw cylinder part having a cylindrical gap formed between the nozzle part and itself into which the connection pipe is inserted, and the cap nut having a female screw part at one end to be threaded to the male screw cylinder part of the joint body and a tapered face whose diameter is gradually reduced toward the other end from the side of the female screw part. With the operation of the tapered face when screwing the cap nut into the male screw cylinder part, part of the pipe wall of the connection pipe is deformed to the side of the nozzle part to suppress the separation of the connection pipe from the joint body. In the state that the connection pipe is threaded to be externally fitted to the nozzle part of the joint body beyond the cap nut, a cap nut turn preventing means prevents the turn of the cap nut or cancels the turn prevention. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is used, for example, when piping a water supply / hot water supply pipe or the like using a synthetic resin pipe capable of plastic deformation, a metal pipe inner surface or a composite pipe whose inner peripheral surface and outer peripheral surface are coated with a synthetic resin. Related to the pipe joint.

  Connecting pipes with a plastically deformable material or structure such as metal-reinforced cross-linked polyethylene pipes (for example, product name ESLON Super Eslometax manufactured by Sekisui Chemical Co., Ltd.) used as piping materials for water supply and hot water supply on the indoor side are used outdoors. A pipe joint 100 as shown in FIGS. 18 and 19 has already been proposed as a pipe joint used for connecting to the pipe material (for example, see Patent Document 1).

  The pipe joint 100 has a nozzle part 111 into which the connection pipe 200 is fitted, and a male screw cylinder part 113 that forms a cylindrical gap 112 between which the connection pipe 200 is inserted. 110, and a cap nut 120 having a female threaded portion 121 threadedly engaged with the male threaded cylindrical portion 113 of the joint body 110 at one end and having a tapered surface 122 whose diameter decreases from the female threaded portion 121 side toward the other end portion, As shown in FIG. 20, the ring main body 131 having a substantially C-shaped cross section and the rotor 132 supported on the peripheral wall of the ring main body 131 in a state of protruding from the inner peripheral surface of the ring main body 131 are provided. In addition, the fastening ring 130 disposed in the cap nut 120 in a state of being fitted on the connection pipe 200 and the nozzle portion 111 are attached to the inner peripheral surface of the connection pipe 200 in a watertight manner. As shown in FIG. 19, the ring body 131 of the tightening ring 130 is rotated by the taper of the taper surface 122 while the ring main body 131 of the tightening ring 130 rotates as the cap nut 120 is tightened into the male threaded tube portion 113. Is done. Then, as the rotor 132 rotates along the tube wall of the connection tube 200, a part of the tube wall is pressed from the outside to the inside so as to fit into the fitting groove 114 provided in the nozzle portion 111. The connecting pipe 200 is connected to the pipe joint 100 by plastic deformation.

That is, the protrusion 210 that protrudes inside the connecting pipe 200 caused by plastic deformation is locked to the side wall surface of the fitting groove 114, and the rotor 132 and the ring are inserted into the concave groove 220 formed on the outer surface of the connecting pipe 200. The retaining pipe 133 is provided on the inner surface of the main body 131 so that the connecting pipe is prevented from coming off.
And since this pipe joint 100 is provided with the above-mentioned composition, even if a strong pulling force in the axial direction is applied to the connecting pipe 200 by simply tightening the cap nut 120 by hand without requiring a large force. There is no risk of disconnection, and there is an advantage that the connection pipe 200 can be securely and firmly connected.

JP-A-2005-351440

By the way, the pipe joint as described above is usually shipped from the factory or transported to the construction site by screwing the cap nut 120 into the joint main body 110 with the tightening ring 130 built in the cap nut 120. However, there were the following problems.
That is, the cap nut 120 may loosen and come off due to vibration during conveyance, and the tightening ring 130 may be lost.

  On the other hand, if the cap nut 120 is fully screwed into the joint body, it is not possible to completely prevent the cap nut 120 from coming off due to loosening, but it will not easily come off. However, if the cap nut 120 is tightened excessively, the tightening ring 130 is reduced in diameter, and in this state, the connecting pipe cannot be fitted over the nozzle portion 111 of the joint body 110 through the cap nut 120. Therefore, at the work site, the cap nut 120 must be once tightened to a predetermined position at which the ring 130 is in a non-reduced diameter state, and workability is poor.

  In view of the above circumstances, an object of the present invention is to provide a pipe joint that can prevent detachment due to loosening of a cap nut when not in use, such as during transportation or storage, and has excellent workability during use.

  In order to achieve the above object, a pipe joint according to claim 1 of the present invention (hereinafter referred to as "joint of claim 1") includes a nozzle part into which a connecting pipe is fitted and a nozzle part. A joint body having a male threaded cylinder part forming a cylindrical gap between which the connecting pipe is inserted, and a female thread part screwed into the male threaded cylinder part of the joint body at one end and the other end part from the female thread part side And a cap nut having a tapered surface that decreases in diameter toward the nozzle, and by connecting the cap nut to the male threaded cylindrical portion, a part of the tube wall of the connecting pipe is deformed to the nozzle portion side by the action of the tapered surface. In a pipe joint that is designed to prevent the pipe from being detached from the joint body, the cap nut can be prevented from rotating in a threaded state in which the connecting pipe can be fitted over the nozzle part of the joint body through the cap nut. , Non-rotating means of cap nut that can be released It is characterized in that it comprises.

  The pipe joint according to claim 2 of the present invention (hereinafter, referred to as “joint of claim 2”) is a pipe joint in which the male thread cylinder portion receives the end face of the cap nut in the connected state of the connecting pipe. And a non-rotating means is externally fitted to the male screw cylinder so as to be sandwiched between the end of the cap nut and the protrusion or notch provided on the hook-shaped portion and the cap nut and the hook-shaped portion. A spacer body having a substantially semicircular cross-section, and a spacer having a notch or a protrusion that engages with a protrusion or notch provided on the flange-like portion provided on both sides in the width direction of the spacer body. It is characterized by.

  The pipe joint according to claim 3 of the present invention (hereinafter referred to as "joint of claim 3") is a pipe joint in which the male thread cylinder portion receives the end face of the cap nut in the connected state of the connecting pipe. Rotating means is integrated with the end of the cap nut and the notch provided in the hook-shaped portion, and the end of the cap nut so as to be swingable in the radial direction of the cap nut via the thin wall portion. It is formed and the front-end | tip part is comprised from the engagement bar engaged with the notch provided in the said hook-shaped part, It is characterized by the above-mentioned.

  A pipe joint according to claim 4 of the present invention (hereinafter referred to as "joint of claim 4") is a ring body having a substantially C-shaped cross section in any of the joints of claims 1 to 3. And at least one rotor rotatably supported by the peripheral wall of the ring body in a state of protruding from the inner peripheral surface of the ring body, and disposed in the cap nut in a state of being fitted on the connection pipe. As the cap nut is tightened, the diameter of the ring main body is reduced by the tapered surface of the cap nut, and the rotor rotates along the tube wall of the connecting pipe, so that a part of the pipe wall of the connecting tube is disposed in the nozzle portion. It is characterized by having a tightening ring that deforms to the side.

  The pipe joint according to claim 5 of the present invention (hereinafter referred to as "joint of claim 5") is the joint according to any one of claims 1 to 4, wherein the nozzle portion is connected to the peripheral surface thereof. It is characterized by having a ring-shaped water stop material at a position facing the deformation position of the pipe.

In the present invention, the number of the rotors of the tightening ring is not particularly limited, but it is preferable to provide about 2 to 4 radially.
The material of the rotor is not particularly limited as long as it can plastically deform the connecting pipe and engage the formed concave groove to prevent the connecting pipe from coming off, but for example, stainless steel, steel, brass And aluminum.

  As described above, the joint according to claim 1 is a joint body having a nozzle part into which the connecting pipe is fitted and a male threaded cylinder part that forms a cylindrical gap into which the connecting pipe is inserted. And a cap nut having a taper surface having a female thread portion screwed into the male screw cylinder portion of the joint body at one end and a diameter decreasing from the female screw portion side toward the other end portion, and a male screw cylinder portion of the cap nut In the pipe joint in which a part of the pipe wall of the connection pipe is deformed to the nozzle portion side by the action of the tapered surface by being screwed into the pipe joint so that the connection pipe is prevented from being detached from the joint body. The connection pipe is fitted into the joint body nozzle so that it can be externally fitted, and the cap nut is prevented from rotating. Turn the cap nut by the stop means Once you have to order state, there is no withdrawal due to loosening of the cap nut when not in use, such as during transportation or storage. If the anti-rotation means is released at the time of use, it is possible to immediately start the connection work of the connecting pipe, and the workability is extremely excellent.

  The joint according to claim 2 has a hook-shaped portion for receiving the end face of the cap nut in a state where the male screw cylinder portion is connected to the connecting pipe, and a rotation preventing means is a protrusion provided on the end portion of the cap nut and the hook-shaped portion. Alternatively, the spacer main body having a substantially semicircular cross-sectional shape that is externally fitted to the male screw cylinder so as to be sandwiched between the notch and the cap nut and the hook-shaped portion, and the hook-shaped portions provided on both sides in the width direction of the spacer main body. And a spacer having a notch or a protrusion engaging with a notch or a notch provided on the end of the cap nut and the collar shape of the male threaded cylinder portion with the spacer body tightened to a predetermined position of the male threaded cylinder portion. The outer nut is fitted onto the external thread cylinder between the cap nut and the protrusion or notch of the spacer body is engaged with the hook-shaped portion and the notch or protrusion of the cap nut, so that the cap nut connects the connecting pipe over the cap nut. Outside the nozzle part Not rotate with possible screwed state is maintained as. Then, when connecting the connecting pipe, after fitting the connecting pipe to the nozzle part of the joint body through the cap nut with the spacer attached, remove the spacer and tighten the cap nut to the hook-shaped part side. Detachment of connecting pipe can be suppressed.

The joint according to claim 3 has a hook-like portion that receives the end face of the cap nut in a state where the male screw cylindrical portion is connected to the connecting pipe, and a detent means is provided in the end portion of the cap nut and the notch provided in the hook-like portion. And an engaging bar that is integrally formed at the edge of the cap nut so as to be swingable in the radial direction of the cap nut via a thin wall portion and that engages with a notch provided in the hook-shaped portion. Therefore, while swinging the locking bar and avoiding the hook-shaped part, the cap nut is screwed over the cap nut to the male threaded cylinder until it can be screwed onto the joint nozzle. After that, if the end of the locking bar is engaged with the notch of the hook-shaped part, the cap nut will not rotate in a screwed state that allows the connection pipe to be fitted over the nozzle part of the joint body over the cap nut. Retained. When connecting the connection pipe, the connection pipe is externally fitted to the nozzle portion of the joint body through the cap nut while the engagement state of the engagement bar with the notch is maintained, and then the engagement bar is swung. By disconnecting the locking bar at the thin-walled portion to release the engagement of the locking bar with the notch and tightening the cap nut on the hook-shaped portion side, the connection pipe can be prevented from being detached.
That is, according to the joint of the third aspect, since the locking bar may be formed integrally with the cap nut, the number of parts can be reduced.

  The joint according to claim 4 includes a ring body having a substantially C-shaped cross section, and at least one rotor supported on the peripheral wall of the ring body so as to be rotatable in a state of protruding from the inner peripheral surface of the ring body. In addition, the ring body is disposed in the cap nut in a state of being fitted on the connecting pipe, and the diameter of the ring body is reduced by the tapered surface of the cap nut as the cap nut is tightened, and the rotor is connected to the pipe wall of the connecting pipe. It is equipped with a tightening ring that turns along the tube and deforms a part of the pipe wall of the connecting pipe to the nozzle side, so it is possible to pull out the connecting pipe strongly in the axial direction by simply tightening the cap nut by hand. Even if force is applied, there is no risk of disconnection, and the connecting pipe can be securely and firmly connected.

  In the joint according to claim 5, since the nozzle portion is provided with the ring-shaped water stop material at the position facing the deformation position of the connection pipe on the peripheral surface, the connection pipe can be connected securely and firmly and more reliably. The water can be stopped.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
1 and 2 show one embodiment of a pipe joint according to the present invention.

As shown in FIGS. 1 and 2, the pipe joint 1 includes a joint body 2, a cap nut 3, a tightening ring 4, a ring-shaped water blocking material 5 as shown in FIG. The spacer 7 which comprises a part is provided.
That is, the joint main body 2 is composed of a main body member 2a, a C-shaped ring 2b, and a male screw cylinder member 2c.

The main body member 2a is formed of a metal material such as brass, gun metal, stainless steel, steel, and the like, and a nozzle portion 21 into which a connection pipe 6 described later is fitted and a piping material (not shown) threaded on the inner peripheral surface. The first male threaded cylinder portion 22 is screwed and a grip portion 23 having a hexagonal hook.
The male screw cylinder member 2c is obtained by molding a transparent resin such as polyethersulfone (PES), and as shown in FIGS. 4 and 5, a second male screw cylinder portion 24 to which the cap nut 3 is screwed, And a hook-like portion 25 provided at the terminal portion of the second male screw cylinder portion 24 and projecting outward from the second male screw cylinder portion 24.

  The hook-like portion 25 constitutes a part of the rotation preventing means on the surface on the nozzle portion 21 side, and an engagement protrusion 25 a that engages with an engagement concave portion 35 of the cap nut 3 described later has a center of the hook-like portion 25. One is provided at a symmetrical position across the shaft, and a notch 25b is provided at a position adjacent to the engaging protrusion 25a.

The engagement protrusion 25a has a substantially right-angled triangular cross section formed so that the tapered surface faces the opposite side to the tightening direction of the cap nut 3 described later.
The C-shaped ring 2b is configured to combine and integrate the main body member 2a and the male screw cylinder member 2b.

The nozzle portion 21 has a fitting groove 26 for the ring-shaped water blocking material 5 while the maximum diameter is substantially the same as or slightly smaller than the inner diameter of the connection pipe 6.
As for the 2nd external thread cylinder part 24, four protrusions 27 parallel to the pipe axis of the 2nd external thread cylinder part 24 are provided in the inner peripheral surface at equal intervals.

  The height of the protrusion 27 does not obstruct the insertion of the connecting pipe 6 inserted into the cylindrical gap 23 as much as possible, and is pressed against the outer wall surface of the pipe end of the inserted connecting pipe 6 to tighten the cap nut 3. The height is not particularly limited as long as the connecting pipe 6 does not rotate together at the time of insertion, and is appropriately determined according to the sizes of the pipe joint 1 and the connecting pipe 6.

The cap nut 3 is formed of an engineering plastic or the like, and as shown in FIGS. 6 and 7, the female screw portion 31 screwed into the second male screw cylindrical portion 24 at one end and the insertion hole 32 of the connection tube 6 at the other end. A tapered surface 33 is formed between the female screw portion 31 and the insertion hole 32 and gradually reduces in diameter from the end of the female screw portion 31 toward the other end.
Further, on the inner surface of the cap nut 3, a concave portion 34 for fixing the rotor is formed in a portion where the rotor 42 is positioned in the tightened state and a part of the tapered surface 33 is notched in a ring shape. Has been.

The end of the cap nut 3 on the second male threaded cylinder portion 24 side is formed so that its outer diameter is substantially the same as or slightly smaller than the outer diameter of the bowl-shaped portion 25, and constitutes a part of the detent means at one place. A notch 36 is provided.
Further, an engagement recess 35 that engages with the engagement protrusion 25a is formed continuously on the end surface of the cap nut 3 on the second male screw cylinder portion 24 side over the entire circumference of the end surface.
The engaging recess 35 has a substantially right-angled triangular cross section having a tapered surface having the same inclination angle as the tapered surface of the engaging protrusion 25a in a direction facing the tapered surface of the engaging protrusion 25a.

The tightening ring 4 includes a ring main body 41 and two rotors 42.
The ring body 41 has a substantially trapezoidal cross-sectional shape in which the outer peripheral surface is a tapered surface 46 that gradually decreases in diameter from the intermediate portion in the thickness direction, and has a substantially C-shape with a part cut off. It is obtained by molding a plastic such as a polyamide resin.
A part of the ring body 41 is provided with two mounting holes 43 for a rotor 42 described later. In addition, a large number of cutout grooves 44 parallel to the central axis of the ring main body 41 are formed on the outer peripheral surface of the ring main body 41 so that the ring main body 41 is uniformly reduced in diameter and reduced in material. Further, on the inner peripheral surface of the ring main body 41, a locking rib 45 provided so as to be orthogonal to the rotation axis of the rotor 42 is provided in an annular shape except for the rotor 42 portion.

The rotor 42 is provided with a large number of knurled grooves 42a parallel to the axis on its peripheral surface.
The rotor 42 is formed of a metal material such as brass, gun metal, stainless steel, steel, or engineering plastic, and is press-fitted into the mounting hole 43, and is inserted into the central axis of the ring body 41 within the mounting hole 43. The ring body 41 is rotatable about a parallel axis and is slightly slidable in the radial direction of the ring body 41 (direction perpendicular to the central axis of the ring body 41).

The ring-shaped water blocking material 5 is made of a synthetic rubber such as ethylene-propylene rubber (EPDM), and as shown in FIG. A groove 51 is formed.
In addition, the ring-shaped water blocking material 5 is fitted into the fitting groove 26 of the nozzle portion 21 so that the vertical wall 52 side of the cutout groove 51 faces the cap nut 3 side. The size is designed so as not to protrude outward from the upper end of the fitting groove 26.

The spacer 7 is formed of polypropylene resin or the like, and as shown in FIG. 1, a spacer main body 71 having an arc shape having an inner diameter substantially the same as or slightly smaller than the outer diameter of the second male screw cylinder portion 24, And a knob 72 provided so as to protrude outward in the center of the arc of the spacer main body 71.
In the base of the knob 72 of the spacer body 71, a protrusion 73 that fits into the notch 36 of the cap nut 3 is provided on one side surface, and a recess 74 in which the engagement protrusion 25a of the hook-shaped portion 25 is fitted on the other side surface. Is provided.

  The pipe joint 1 is configured as described above. As shown in FIG. 2, the distance between the end face of the cap nut 4 and the hook-shaped portion 25 is set with the tightening ring 4 built in the cap nut 3. After being screwed into the second male threaded cylinder portion 24 to approximately the same width as the spacer main body 71, the projection 73 is fitted into the notch 36 of the cap nut 3, and the recess 74 is fitted into the engagement projection 25a of the hook-like portion 25. The spacer main body 71 is conveyed or stored in a state in which the spacer main body 71 is externally fitted to the second male screw cylinder portion 24 so as to be stuck.

That is, by fitting the protrusion 73 into the notch 36 and fitting the engagement protrusion 25a into the recess 74, the cap nut 3 is prevented from rotating in any direction of unfastening. Therefore, the problem that the cap nut 3 is detached during the conveyance or the tightening ring 4 is lost is solved.
At this time, the tightening ring 4 is held in a non-reduced state larger than the outer diameter of the connecting pipe to which the minimum diameter is connected. That is, the cap nut 3 is held by the spacer body 71 at the screwing position where the diameter of the tightening ring 4 is not reduced by the tapered surface 33.

  Next, the connection method of the connection pipe 6 of this pipe joint 1 is shown in FIG. 2 and the pipe wall is formed by two resin layers 68 and a metal layer 69 such as aluminum provided between the resin layers 68. A metal-reinforced cross-linked polyethylene pipe (for example, trade name “ESLON SUPER ETHROMETAX” manufactured by Sekisui Chemical Co., Ltd.) will be described with reference to FIGS.

  First, in a state where the spacer 7 is externally fitted as shown in FIG. 2, the connecting pipe 6 is inserted into the insertion hole 32 of the cap nut 3 from the insertion hole 32 side toward the female screw portion 31 side as shown in FIG. Then, the connection pipe 6 is fitted into the nozzle portion 21 until the tip of the connection pipe 6 hits the inner wall of the cylindrical gap 23. The maximum diameter of the nozzle portion 21 is substantially the same as or slightly smaller than the inner diameter of the connecting pipe 6, and the ring-shaped waterstop material 5 fitted in the fitting groove 26 of the nozzle portion 21 is formed from the upper end of the fitting groove 26. Since it does not protrude outward, the connecting pipe 6 can be inserted into the nozzle portion 21 without resistance. In addition, as shown in FIG. 9, the four protrusions 27 provided on the inner peripheral surface of the second male screw cylinder portion 24 are pressed into contact with each other in a state where they bite into a part of the outer peripheral surface of the connection pipe 6. At this time, since the tightening ring 4 is held in a non-reduced diameter state, it is smoothly fitted onto the connecting pipe 6 in the cap nut 3. At this time, since the male screw cylinder member 2c is formed of a transparent resin, it can be easily recognized from the outside that the connecting pipe 6 is fitted to a predetermined position of the nozzle portion 21.

  Next, as shown in FIG. 8, the spacer 7 is removed, and as shown in FIGS. 10 and 11, the engagement recess 35 provided on the end face of the cap nut 3 engages with the engagement protrusion 25 a of the hook-like portion 25. The cap nut 3 is tightened until the connecting pipe 6 is connected to the pipe joint 1.

  That is, the rotor 42 of the tightening ring 4 is disposed immediately above the ring-shaped waterstop 5 in a state where the end surface of the tightening ring 4 is in contact with the end surface of the second male screw cylinder portion 24. When the cap nut 3 is tightened in this state, the taper surface 46 of the ring main body 41 of the tightening ring 4 is received by the taper surface 33 of the cap nut 3, and the ring main body 41 is rotated with the rotation of the cap nut 3. The diameter is gradually reduced while co-rotating. At the same time, the rotor 42 presses the outer wall of the connecting pipe 6 in the direction of the ring-shaped water blocking material 5 along with the diameter reduction of the ring main body 41, and plastically deforms the metal layer 69 of the connecting pipe 6 in the diameter reducing direction. The resin layer 68 also rotates along the outer wall surface of the connecting pipe 6 while being deformed so as to follow the plastic deformation shape of the metal layer 69. In addition, since the rotor 42 is provided with the knurled groove 42 a on the rotation surface thereof, the rotor 42 rotates smoothly without slipping on the surface of the connection pipe 6. Accordingly, the cap nut 3 can be easily tightened with a small force using a hand.

  As described above, when the rotor 42 rotates along the outer wall surface of the connection pipe 6 while the ring body 41 is reduced in diameter, the tube wall of the connection pipe 6 where the rotor 42 rotates is Plastic deformation is performed so as to enter the fitting groove 26. That is, the annular deformed groove 61 is formed on the outer wall side of the plastic deforming portion 60, and the engaging rib 45 enters the annular recessed groove 61, and the annular projecting portion in which the inner wall side of the plastic deforming portion 60 enters the fitting groove 26. 62. The annular protrusion 62 is pressed against the ring-shaped waterstop 5.

Therefore, the connecting pipe 6 includes the rotor 42 and the locking rib 45 fitted in the annular groove 61 so that the side wall of the annular groove 61 is locked and the annular protrusion 62 that enters the fitting groove 26. It is locked to the side wall of the fitting groove 26 to prevent it from coming off. At the same time, the annular protrusion 62 is pressed against the ring-shaped waterstop 5 so that a watertight state is secured. Further, since the protrusion 27 is in pressure contact with the outer wall surface of the pipe end portion of the connection pipe 6, the connection pipe 6 does not hold the connection pipe 6 by hand, but the joint nut 6 is tightened as the cap nut 3 is tightened. There is no turning. That is, the connection pipe 6 can be connected without being twisted together, and one-handed work can be performed, thereby improving workability.
Further, when the cap nut 3 is tightened until the end of the cap nut 3 comes into contact with the hook-shaped portion 25, the concave portion 34 comes to a position facing the rotor 42, and the rotor is placed in the concave portion 34. 42 is received and fixed. That is, since the rotor 42 is slightly slidable in the mounting hole 43, the rotor 42 is slightly slid toward the concave portion 34 by the elastic restoring force of the ring-shaped waterstop 5. Accordingly, the pressing force applied to the outer wall surface of the connecting pipe 6 by the rotor 42 is alleviated, and a decrease in water stoppage with time due to creep deformation due to overcompression of the ring-shaped waterstop 5 can be prevented.

Further, as shown in FIG. 5, in the pipe joint 1, when the cap nut 3 is tightened to the tightening completion position, the ring-shaped main body 41 is connected to the cap nut 3, the connecting pipe 6, and the second male screw cylinder portion 24. It is designed to be in a state where the space formed between the two and the space is almost densely packed.
That is, the wall surface of the ring-shaped main body 41 is held in contact with the wall surfaces of the cap nut 3, the connecting pipe 6, and the second male screw cylinder portion 24 over almost the entire surface when the cap nut 3 is completely tightened. Therefore, even when a thermal fluid is flowed into the pipe, the ring-shaped main body 41 is not deformed, and a stable connection state of the connection pipe 6 can be ensured.

Further, since the ring-shaped water blocking material 5 has the vertical wall 52 side of the notch groove 51 facing the cap nut 3, when the internal pressure in the pipe is applied to the ring-shaped water blocking material 5, the internal pressure is received by the vertical wall 52. As a result, the self-sealing function works to ensure more reliable water stoppage.
Further, since the male threaded cylinder portion of the joint body is formed of a transparent resin, it can be visually recognized from the outside that the connecting pipe has been inserted to a predetermined position, and connection failure due to insufficient insertion of the connecting pipe can be eliminated. .

12 to 14 show a second embodiment of the pipe joint according to the present invention.
As shown in FIGS. 12-14, this pipe joint 10 is the same as that of the said pipe joint 1 except having changed the spacer 7 of the said pipe joint 1 into the spacer 7a explained in full detail below.

  That is, the spacer 7 a is provided with three protrusions 76 a, 76 b, 76 b on the outer wall surface of the spacer body 75 having a substantially semicircular cross section in place of the knob 72, and at the center of both wall surfaces in the width direction of the spacer body 75. The protrusions 77 are provided symmetrically, and the notches 78 are provided symmetrically adjacent to the protrusions 77.

As shown in FIGS. 13 and 14, the protrusion 76 a has a rectangular shape in plan view in the arc direction of the spacer body 75.
As shown in FIGS. 13 and 14, the protrusion 76 b has a substantially triangular cross-section in which the wall surface on the center side of the arc is perpendicular to the center axis CL of the arc, and is slightly smaller than the center O of the arc of the spacer body 75. It is provided symmetrically from the center.

  As shown in FIG. 12, the joint 10 has one protrusion 77 in the notch 25 b of the flange 25 and an engagement protrusion 25 a of the flange 25 in the notch 78 provided adjacent to the protrusion 77. And the spacer 7a with the other projections 77 fitted in the notches 36 of the cap nut 3, respectively, so that the cap nut is connected to the cap body through the cap nut in the same manner as the joint 1. It can hold | maintain so that it may not rotate in the screwing state which can be externally fitted to the nozzle part. Further, the connecting pipe can be connected in the same manner as the joint 1. The spacer 7a can be easily removed by hooking a finger on the inclined surface of the protrusion 76b.

Moreover, since this joint 10 does not have the large protrusion part like the knob 72 in the spacer 7a on the outer side of the spacer main body 75, when the joint 10 is packed, there is an accident that the knob 72 part becomes an obstacle or the knob part is broken. Absent.
Furthermore, since the spacer 7a has a symmetrical shape, the assembly workability is excellent.

15 to 17 show a third embodiment of the pipe joint according to the present invention.
As shown in FIGS. 15-17, this pipe joint 1a is the same structure as the said pipe joint 1 except the structure described below.

  That is, this pipe joint 1a does not have the spacer 7, and instead of the notch 36, instead of the notch 36, one locking bar constituting a part of the detent means connected to the end face of the cap nut 3a. It is the same as that of the pipe joint 1 except that 38 is integrally formed.

  This pipe joint 1a is as described above. When not in use such as during transportation or storage, as shown in FIG. 15, the locking bar 38 is provided with the tightening ring 4 built in the cap nut 3a. The tip end face of the locking bar 38 is substantially flush with the end face of the notch 25b of the hook-like portion 25 in a state where the thin-walled portion 37 is deflected in the outer diameter direction of the cap nut 3a so as not to hit the hook-like portion 25. Tighten the cap nut 3a until it reaches the same position. In this state, when the locking bar 38 is engaged with the notch 25b constituting the remaining portion of the rotation preventing means, the cap nut 3a is not rotated in any direction of unfastening. Therefore, the problem that the cap nut 3a is detached during the conveyance or the tightening ring 4 is lost is solved.

On the other hand, at the time of use, instead of removing the spacer 7, the connecting pipe 6 can be connected in the same manner as the pipe joint 1 by cutting the locking bar 38 at the thin portion 37.
Furthermore, in the case of the pipe joint 1a, it is not necessary to use the spacer 7 which is a separate member, so that the number of parts can be reduced, which is advantageous in terms of cost.

The pipe joint according to the present invention is not limited to the above embodiment. For example, in the above embodiment, the first male screw cylinder portion is provided, but a receiving port and a female screw cylinder portion may be provided instead of the first male screw cylinder portion.
In the above embodiment, the joint main body is composed of a metal material main body member and a male screw cylinder member molded of a transparent resin. However, the joint main body may be integrally formed of any one of the materials. .

In the above-described embodiment, the diameter of the tightening ring is reduced by the tapered surface of the cap nut and the connection pipe is connected. However, the tightening ring is eliminated, and the joint described in Japanese Patent Publication No. 6-89866 is used. Further, the connecting pipe may be connected by reducing the diameter of the tip of the male screw cylinder by the tapered surface of the cap nut.
In the above embodiment, the connecting pipe is fitted to the pipe joint with the spacer attached, but the connecting pipe may be fitted to the pipe joint after the spacer is removed.

1 is an exploded perspective view showing a first embodiment of a pipe joint according to the present invention. It is sectional drawing showing the use condition of the rotation prevention means of the cap nut of the pipe joint of FIG. It is a partially cutaway perspective view of a ring-shaped waterstop used in the pipe joint of FIG. It is sectional drawing of the external thread cylinder member of the pipe joint of FIG. It is a side view of the external thread cylinder member of FIG. It is a half cross-sectional view of the cap nut of the pipe joint of FIG. It is an A direction arrow directional view of FIG. It is sectional drawing which shows the state just before fastening of the cap nut of the pipe joint of FIG. It is the XX sectional view taken on the line of FIG. It is sectional drawing which shows the completion state of the cap nut of the pipe joint of FIG. It is a perspective view which shows the completion state of cap nut tightening of the pipe joint of FIG. It is a top view of the assembly state showing 2nd Embodiment of the pipe joint concerning this invention. It is a top view of the spacer of the pipe joint of FIG. It is a front view of the spacer of the pipe joint of FIG. It is a disassembled perspective view showing 3rd Embodiment of the pipe joint concerning this invention. It is a front half sectional view of the cap nut of the pipe joint of FIG. It is a plane half sectional view of the cap nut of the pipe joint of FIG. It is sectional drawing which shows the state just before fastening of the cap nut of a well-known pipe joint. FIG. 19 is a cross-sectional view showing a state where the cap nut of the pipe joint of FIG. 18 is completely tightened. It is a front view of the fastening ring of the pipe joint of FIG.

Explanation of symbols

1, 10, 1a Pipe joint 2 Joint body 21 Nozzle part 23 Cylindrical gap 24 Second male screw cylinder part (male screw cylinder part)
27 ridge 25a engagement protrusion (rotation prevention means)
25b Notch (non-rotating means)
3, 3a Cap nut 31 Female thread portion 33 Tapered surface 34 Recess 36 Notch (rotation prevention means)
38 Locking bar (non-rotating means)
4 Tightening ring 41 Ring main body 42 Rotor 5 Ring-shaped water-stopping material 6 Connection pipe 7, 7a Spacer (rotation prevention means)
73 Projection (Non-rotating means)
74 Concave portion (rotating stop means)
77 Protrusion (Non-rotating means)
78 Notch (Non-rotating means)

Claims (5)

A joint body having a nozzle part to which the connecting pipe is fitted and a male threaded cylinder part that forms a cylindrical gap in which the connecting pipe is inserted between the nozzle part;
A cap nut having a female thread portion threadedly engaged with the male screw cylinder portion of the joint body at one end and a tapered surface that is reduced in diameter from the female screw portion side toward the other end portion, and to the male screw cylinder portion of the cap nut. In the pipe joint in which a part of the pipe wall of the connection pipe is deformed to the nozzle part side by the action of the tapered surface by screwing so that the connection pipe is prevented from being detached from the joint body.
It is characterized in that it is provided with means for preventing rotation of the cap nut while preventing the rotation of the cap nut in a screwed state in which the connecting pipe can be externally fitted to the nozzle portion of the joint body through the cap nut. Pipe fittings. The male threaded cylindrical portion has a hook-shaped portion that receives the end face of the cap nut in the connected state of the connecting pipe, and the rotation preventing means includes a protrusion or a notch provided on the end portion of the cap nut and the hook-shaped portion,
A spacer main body having a substantially semicircular cross section that is externally fitted to the male screw cylinder so as to be sandwiched between the cap nut and the hook-shaped portion, and the hook-shaped portion provided on both sides in the width direction of the spacer main body. The pipe joint according to claim 1, comprising a spacer having a notch or a protrusion that engages with the protrusion or the notch. The male thread cylinder has a hook-shaped part that receives the end face of the cap nut in the connected state of the connecting pipe,
Non-rotating means, a notch provided in the end of the cap nut and the hook-shaped portion,
It is formed integrally with the end edge of the cap nut so as to be swingable in the radial direction of the cap nut via a thin wall portion, and the front end portion thereof is constituted by an engagement bar that engages with a notch provided in the hook-shaped portion. The pipe joint according to claim 1.   A ring body having a substantially C-shaped cross section, and at least one rotor rotatably supported by the peripheral wall of the ring body in a state of protruding from the inner peripheral surface of the ring body, and is fitted on the connecting pipe When the cap nut is tightened, the ring body is reduced in diameter by the taper surface of the cap nut, and the rotor rotates along the tube wall of the connecting pipe. The pipe joint in any one of Claims 1-3 provided with the clamping ring which deform | transforms a part of pipe wall of a pipe | tube to the nozzle part side.   The pipe joint in any one of Claims 1-4 with which the said nozzle part is equipped with the ring-shaped water stop material in the position which faces the deformation position of the connection pipe of the surrounding surface.

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