JP4852368B2 - Pipe fitting - Google Patents

Description

  The present invention relates to a 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 joint body having a nozzle part into which a connecting pipe is fitted and a male threaded cylinder part forming a cylindrical gap into which the connecting pipe is inserted between the nozzle part and And a cap nut having a female thread portion threadedly engaged with the male screw cylindrical portion of the joint body at one end and a tapered surface having a diameter reduced from the female screw portion side toward the other end portion, to the male screw cylindrical portion of the cap nut. Pipe joints have already been put on the market in which 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 in to prevent the connection pipe from being detached from the joint body. But the connection of the tube, such as a hot water supply pipe, roof, is plumbed to narrow dark place under the floor or the like. Therefore, it cannot be visually confirmed whether the cap nut is sufficiently tightened to a predetermined position. Therefore, there is a possibility that the cap nut and the joint body may be damaged due to excessive tightening.

  Therefore, a pipe joint 100 as shown in FIGS. 12 and 13 has already been proposed (Patent Document 1). The pipe joint 100 is opposite to the side surface in the screwing direction and the screwing direction on either the end surface 111 of the cap nut 110 or the contact surface 131 of the flange-shaped portion 130 of the joint main body 120 with the end surface of the cap nut 110. A concave portion 200 having a side surface in the direction is formed, and a protrusion 300 having a side surface in the screwing direction and a side surface in the opposite direction to the screwing direction is formed on the other side.

That is, in the case of this pipe joint 100, as shown in FIG. 13, when connecting the connection pipe 400, the cap nut 110 and the joint main body 120 are relatively rotated to rotate the end face 111 and the contact surface 131 of the cap nut 110. Are brought into a state where a desired water-stopping structure can be obtained, the protrusion 300 is fitted into the recess 200, and the force required for tightening is greatly increased, and this force can be easily detected via a tool. Is done. Therefore, even when the operator cannot visually recognize the tightening state such as a narrow and dark place such as the back of the ceiling or under the floor, it can be easily determined as an appropriate final tightening position.
Moreover, since the protrusion 300 is fitted in the recess 200, even if the cap nut attempts to reversely rotate due to vibration or the like after connection, the rotation is prevented and the cap nut 110 does not loosen.

Japanese Patent No. 3188002

  However, in the case of the pipe joint 100, the end surface 111 of the cap nut 110 has a structure that can be received by the abutment surface 131 of the hook-shaped portion 130 only inside in the radial direction. At present, the protrusion 300 may get over the position of the recess 200 due to overhanging, and the damage to the cap nut and the joint body due to overtightening cannot be completely prevented.

  In view of the above circumstances, the present invention allows an operator to easily know an appropriate final tightening position even in a narrow place where the tightening state cannot be visually recognized, and causes damage to the cap nut and the joint body. It aims at providing the pipe joint which can prevent an overtightening.

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. A flange-shaped portion having a receiving surface for receiving the tightened end face of the cap nut , which is designed to prevent detachment of the pipe and is substantially the same as or slightly larger than the outer diameter of the end surface of the cap nut on the male screw cylinder portion. One of the end face of the cap nut and the receiving face of the hook-shaped part With protrusions are formed, a pipe joint in which the projection on the other is a recess to be fitted, and a ring body formed in a substantially C-shaped, so as to protrude from the inner circumferential surface of the ring body A rotor rotatably supported on the peripheral wall of the ring body, and disposed in the cap nut in a state of being externally fitted to the connecting pipe. The ring is tightened when the cap nut is tightened into the male screw cylinder. While the main body is reduced in diameter by the tapered surface of the cap nut, the rotor rotates along the tube wall of the connection tube, and the rotor rotation part of the connection tube is formed in an annular convex portion on the inner peripheral surface and annular on the outer peripheral surface. A tightening ring that is plastically deformed so as to form a recess is provided, and the cap nut is provided with a recess in the tapered surface in which the rotor is accommodated and fixed when tightening is completed .

In the pipe joint according to claim 2 of the present invention (hereinafter referred to as "joint of claim 2") , the connection pipe is inserted between the nozzle part to which the connection pipe is fitted and the nozzle part. A joint body having a male threaded cylinder part forming a cylindrical gap, and a tapered surface having a female thread part threadedly engaged with the male threaded cylinder part of the joint body at one end and reducing the diameter from the female thread part side toward the other end part A cap nut having an outer diameter of the connecting pipe, and by screwing the cap nut into the male threaded cylindrical portion, a portion of the pipe wall of the connecting pipe is deformed to the nozzle portion side by the action of the tapered surface to prevent the connecting pipe from being detached. The male threaded cylinder portion is provided with a hook-like portion having a receiving surface for receiving the end surface of the tightened cap nut, which is substantially the same as or slightly larger in diameter than the end surface of the cap nut. A protrusion is formed on one of the receiving surfaces of the bowl-shaped part On the other hand, a pipe joint is formed with a recess into which the projection is fitted, and presses against the outer wall of the connection pipe inserted into the cylindrical gap to suppress the joint rotation of the connection pipe when the cap nut is tightened A plurality of protrusions are formed on the inner peripheral surface of the male screw cylinder .

Pipe joint according to claim 3 of the present invention (hereinafter, referred to as "joint according to claim 3"), in the pipe joint of the 請 Motomeko 2, a ring body formed in a substantially C-shaped, the ring body And a rotor that is rotatably supported by the peripheral wall of the ring main body in a state of protruding from the inner peripheral surface, and is arranged in the cap nut in a state of being externally fitted to the connecting pipe, and is a male screw cylinder portion of the cap nut As the ring main body is reduced in diameter by the tapered surface of the cap nut, the rotor rotates along the tube wall of the connection tube, and the rotor rotation part of the connection tube is set to the inner peripheral surface. An annular convex part and a tightening ring that is plastically deformed so as to form an annular concave part on the outer peripheral surface are provided.

Pipe joint according to claim 4 of the present invention (hereinafter, referred to as "joint according to claim 4"), in any one of the pipe joint of claim 1 to claim 3, wherein the projection and recess are included screwing It has a flat part on both the direction side and the screw loosening direction side, and one flat part is formed into a substantially right-angled triangle with a hypotenuse and the flat part that becomes the hypotenuse when facing the screw It is characterized by being.

The pipe joint according to claim 5 of the present invention (hereinafter referred to as “joint according to claim 5”) is a ring-shaped fitting that is fitted to the nozzle portion in the pipe joint according to any one of claims 1 to 4. A water-stopping material is provided, and the ring-shaped water-stopping material is compressed by the annular convex portion of the connecting pipe to stop the water .

The pipe joint according to claim 6 of the present invention (hereinafter referred to as "joint of claim 6") is the pipe joint according to any one of claims 1 to 5, wherein the male thread cylinder portion of the joint body is transparent. It is characterized by being formed of resin .

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 by the action of the tapered surfaces by screwing into a portion of the tube wall of the connecting tube be adapted to prevent separation of the connecting pipe is deformed in the nozzle portion, the outer end face of the cap nut on the external thread tubular portion A hook-shaped part with a receiving surface that receives the end face of the tightened cap nut is provided, and a protrusion is formed on either the end face of the cap nut or the receiving surface of the hook-shaped portion. In addition, a recess is formed on the other side to fit the protrusion. A pipe joint that has a ring body formed in a substantially C-shaped, and a rotor which is supported on the peripheral wall of the rotatably ring body so as to protrude from the inner circumferential surface of the ring body The rotor is connected while the ring body is reduced in diameter by the taper surface of the cap nut as the cap nut is tightened into the male threaded cylindrical portion. A tightening ring that rotates along a tube wall of the tube and plastically deforms the rotating portion of the connecting tube rotor so as to form an annular convex portion on the inner peripheral surface and an annular concave portion on the outer peripheral surface; The tapered surface is provided with a recess in which the rotor is accommodated and fixed in a tightening completed state.
Therefore, the joint of claim 1 tightens the cap nut, and when the end surface of the cap nut comes into substantially contact with the receiving surface of the hook-shaped portion, the protrusion fits into the recess, and the operator tightens the cap nut. Achievement can be detected by vibration during fitting. Moreover, since the end surface of the cap nut is received almost entirely by the receiving surface of the hook-shaped portion, overtightening can be prevented.
Further, even if the connecting tube is not held by hand when the cap nut is tightened, the connecting tube can be connected without being twisted together. That is, one-handed work is possible and workability is improved.

The joint according to claim 2 is a joint body having a nozzle part into which the connection pipe is fitted, and a male threaded cylinder part that forms a cylindrical gap into which the connection pipe is inserted, and the joint body. And a cap nut having a tapered surface with a diameter reduced from the female screw portion side toward the other end portion, the screw nut being screwed into the male screw cylindrical portion. By the action of the taper surface, a part of the pipe wall of the connecting pipe is deformed to the nozzle part side to prevent the connecting pipe from coming off, and the male threaded cylinder part is substantially the same as the outer diameter of the end face of the cap nut. A hook-shaped part having a receiving surface for receiving the end face of the tightened cap nut is provided, and a protrusion is formed on either the end face of the cap nut or the receiving surface of the hook-shaped part, and the other A pipe joint in which a recess for fitting the projection is formed A plurality of protrusions that press against the outer wall of the connecting pipe inserted into the cylindrical gap and prevent the connecting pipe from rotating together when the cap nut is tightened are formed on the inner peripheral surface of the male threaded cylinder part. ing.
Therefore, in the joint of claim 2, when the cap nut is tightened and the end surface of the cap nut comes into substantially contact with the receiving surface of the hook-shaped portion, the protrusion fits into the recess, and the operator tightens the nut. Achievement can be detected by vibration during fitting. Moreover, since the end surface of the cap nut is received almost entirely by the receiving surface of the hook-shaped portion, overtightening can be prevented.
Further, the ring-shaped water stop material is overcompressed by the rotor, and the water stop does not deteriorate over time due to creep deformation.

  The joint according to claim 3 includes a ring main body formed in a substantially C-shaped cross section, and a rotor supported on the peripheral wall of the ring main body in a state of protruding from the inner peripheral surface of the ring main body, It is arranged in the cap nut in a state of being fitted on the connecting pipe, and the rotor is connected to the connecting pipe while the ring body is reduced in diameter by the tapered surface of the cap nut as the cap nut is tightened into the male threaded cylindrical portion. Since it has a tightening ring that rotates along the tube wall and plastically deforms the rotating part of the connecting tube to form an annular convex part on the inner peripheral surface and an annular concave part on the outer peripheral surface, By simply tightening by hand, there is no risk of disconnection even if a strong pulling force in the axial direction is applied to the connecting pipe, and the connecting pipe can be securely and firmly connected.

According to a fourth aspect of the present invention, the protrusion and the recess have a flat portion on both sides of the screw tightening direction and the screw loosening direction, and are formed in a substantially right-angled cross section with one flat portion being a hypotenuse. Since the flat part which becomes the hypotenuse at the time of screw tightening is formed so as to face, when the cap nut is tightened into the male threaded cylinder part, the protrusion is not It can be tightened with a light force until it gets over the recess while elastically deforming and the cap nut is in a predetermined position. Once the cap nut is tightened to a predetermined position, the vertical flat portion of the protrusion is received by the vertical flat portion of the recess, so that the reverse rotation of the cap nut is prevented and the cap nut is loosened. Absent.

The joint according to claim 5 includes a ring-shaped waterstop material fitted to the nozzle portion, and compresses the ring-shaped waterstop material by the annular convex portion of the connection pipe so that the connection pipe is fixed. It can connect securely and firmly, and can stop water more reliably.

In the joint of claim 6, since the male threaded cylinder part of the joint body is formed of a transparent resin, the male threaded cylinder part of the joint body is formed of a transparent resin, so that the connecting pipe is inserted to a predetermined position. However, it can be visually recognized from the outside, and connection failure due to insufficient insertion of the connecting pipe can be eliminated.

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, and a ring-shaped waterstop material 5 as shown in FIG. 3.
That is, the joint body 2 includes a 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 has a receiving surface 25b that receives an end face of the cap nut 3 described later, and an engaging projection 25a that fits into a recess 35 of the cap nut 3 described later at a symmetrical position across the central axis of the cap-shaped portion 25. One by one.

The engaging protrusion 25a has a substantially right-angled triangular cross section including an inclined flat surface portion 25c and a vertical flat surface portion 25d, and is formed so that the inclined flat surface portion 25c faces the direction opposite to the tightening direction of the cap nut 3 described later. Has been.
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 outer diameter of the end of the cap nut 3 on the second male threaded cylinder portion 24 side is formed to be substantially the same as or slightly smaller than the outer diameter of the flange-shaped portion 25.
Moreover, the recessed part 35 which the protrusion 25a fits is continuously formed in the end surface by the side of the 2nd external thread cylinder part 24 of the cap nut 3 over the perimeter of an end surface.

  The concave portion 35 has a substantially right-angled cross section substantially the same shape as the projection 25a into which the projection 25a is fitted. In other words, the tightening direction of the cap nut 3 includes the inclined flat portion 35a and the vertical flat portion 35b, and the inclined flat portion 35a faces the inclined flat portion 25c of the protrusion 25a when the cap nut 3 is tightened. It is formed to face.

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.

  Next, the connection method of the connection pipe 6 of this pipe joint 1 is a metal reinforced bridge in which a pipe wall is formed by two resin layers 68 and a metal layer 69 such as aluminum provided between the resin layers 68. Description will be made based on FIGS. 8 to 11, which are examples in which a polyethylene pipe (for example, trade name ESLON SUPER ETHROMETAX manufactured by Sekisui Chemical Co., Ltd.) is used as the connecting pipe 6.

  First, as shown in FIG. 8, the connection 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, and the tip of the connection pipe 6 hits the inner wall of the cylindrical gap 23. Until the nozzle part 21 is fitted. 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.

  Next, as shown in FIGS. 10 and 11, the cap nut 3 is tightened until the projection 25 a of the hook-like portion 25 is fitted in any one of the recesses 35 of the cap nut 3, and the connecting pipe 6 Is connected to the pipe joint 1.

That is, in this pipe joint 1, the rotor 42 of the tightening ring 4 is disposed immediately above the ring-shaped waterstop 5 with the end surface of the tightening ring 4 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. 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. 10, 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 tube 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.

In addition, since the projection 25a is provided on the receiving surface 25b of the hook-shaped portion 25 and the recess 35 is formed on the end surface of the cap nut 3, when the cap nut 3 is tightened to the tightening completion position, the projection 25a is recessed. 35, the vibration is transmitted at the time of fitting, and the operator can easily know that the tightening is completed without visually checking the tightened state. When the protrusion 25a is fitted in the recess 35, even if a force is applied to the cap nut 3 in the loosening direction, the vertical flat portion 25d is received by the vertical flat portion 35b, so the cap nut 3 does not loosen.
Further, since the receiving surface 25b is substantially the same as or slightly larger in diameter than the outer diameter of the end face of the cap nut 3, even if further tightening is performed, the entire end surface of the cap nut 3 is received by the receiving surface 25b. Can be reliably prevented.

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, a tightening ring is provided, but a pipe joint having a tightening structure as in Patent Document 1 that does not include a tightening ring may be used.

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 embodiment, a metal-reinforced cross-linked polyethylene pipe is used as the connection pipe, but a metal sleeve may be fitted to the pipe end of the connection pipe main body made of the cross-linked polyethylene pipe, or a single metal pipe may be used. I do not care.

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 side view of a well-known pipe joint. FIG. 12 is a cross-sectional view illustrating a state where the cap nut of the pipe joint of FIG. 11 is completely tightened.

DESCRIPTION OF SYMBOLS 1 Pipe joint 2 Joint main body 21 Nozzle part 24 2nd external thread cylinder part 25 ridge part 25a protrusion 25b receiving surface 25c inclined plane part 25d vertical plane part 27 protrusion 3 cap nut 31 female thread part 33 taper surface 34 recessed part for pressing force adjustment 35 concave portion 35a inclined flat surface portion 35b vertical flat surface portion 4 tightening ring 41 ring main body 42 rotor 42a knurled groove 5 ring-shaped waterstop material 6 connecting pipe 60 plastic deformation portion 61 annular concave groove 62 annular convex portion

Claims (6)

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. Due to the action of the tapered surface by screwing, a part of the pipe wall of the connecting pipe is deformed to the nozzle part side to prevent the connecting pipe from being detached ,
The male threaded cylinder portion is provided with a hook-like portion having a receiving surface that is substantially the same as or slightly larger in diameter than the end surface of the cap nut and receives the end surface of the cap nut that is tightened. A pipe joint in which a protrusion is formed on any one of the receiving surfaces and a recess into which the protrusion is fitted is formed on the other,
A ring body having a substantially C-shaped cross-section and a 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, and are fitted on the connecting pipe. The rotor is rotated along the pipe wall of the connecting pipe while the ring body is reduced in diameter by the taper surface of the cap nut as the cap nut is tightened into the male screw cylinder. And a tightening ring that plastically deforms the rotor rotating portion of the connecting pipe so as to form an annular convex portion on the inner peripheral surface and an annular concave portion on the outer peripheral surface,
The pipe joint , wherein the cap nut is provided with a recess in the tapered surface in which the rotor is accommodated and fixed in a tightened state . 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. Due to the action of the tapered surface by screwing, a part of the pipe wall of the connecting pipe is deformed to the nozzle part side to prevent the connecting pipe from being detached,
The male threaded cylinder portion is provided with a hook-like portion having a receiving surface that is substantially the same as or slightly larger in diameter than the end surface of the cap nut and receives the end surface of the cap nut that is tightened. A pipe joint in which a protrusion is formed on any one of the receiving surfaces and a recess into which the protrusion is fitted is formed on the other,
A plurality of protrusions that are pressed against the outer wall of the connecting pipe inserted into the cylindrical gap to prevent the connecting pipe from rotating together when the cap nut is tightened are formed on the inner peripheral surface of the male threaded cylinder part. Characteristic pipe joint. A ring body having a substantially C-shaped cross-section and a 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, and are fitted on the connecting pipe. The rotor is rotated along the pipe wall of the connecting pipe while the ring body is reduced in diameter by the taper surface of the cap nut as the cap nut is tightened into the male screw cylinder. and pipe joint according to 請 Motomeko 2 that comprise a clamping ring is plastically deformed so as to form an annular recess annular projection on the outer peripheral surface on the inner peripheral surface of the rotor rotation portion of the connection tube. The protrusions and recesses have flat portions on both the screw tightening direction side and the screw loosening direction side, and one flat surface portion is formed in a substantially right-angled triangle with a hypotenuse, and when the screw is tightened, The pipe joint in any one of Claims 1-3 currently formed so that the flat part which becomes may face . The ring-shaped water stop material fitted to a nozzle part is provided, The said ring-shaped water stop material is compressed and water-stopped by the cyclic | annular convex part of a connection pipe. Pipe fittings. The pipe joint in any one of Claims 1-5 in which the external thread cylinder part of the said joint main body is formed with transparent resin .

Images