JP2011106662A - Joint for piping and joint structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint for piping capable of reducing the number of parts constituting the joint and facilitating connection, and to provide a joint structure using the joint for piping. <P>SOLUTION: The joint 10 for piping is formed substantially in a cylindrical shape with an inner hole 14. One end side thereof is a piping connection 11, and the other end side is a connection 12 to equipment, and moreover, the interval between them is a hexagonal part 13. An O-ring 17 is attached to a mounting groove 15, and a resin pipe 30 is externally fitted in the pipe connection 11 by inserting the resin pipe 30. After inserting the resin pipe 30 until the front end of the resin pipe 30 abuts on the hexagonal part 13, a band 40 is attached to the outer periphery of the resin pipe 30, and the resin pipe 30 is fastened, thereby making a protrusion 16 bite into the inner peripheral surface thereof. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a joint for piping for connecting a resin pipe (which may be a metal composite resin pipe in which a metal is laminated on an intermediate layer) and a joint structure in which a resin pipe is connected to the joint for piping.

  Synthetic resin pipes made of synthetic resin and resin pipes with reinforcement layers with appropriate reinforcement layers (for example, metal composite resin pipes with an intermediate layer made of an aluminum alloy layer and polyethylene layers laminated on both sides) are used for water supply and hot water supply pipes and fans Widely used for connecting coil units and cold / hot water pipes.

  Examples of pipe joints used for connecting resin pipes include compression joints, tightening joints, and plug-in joints. Of these joints, compression joints are often used in consideration of the unit price of products, the reliability of connection parts, workability, and the like. The compression joint is a pipe joint that stably exhibits the above performance regardless of the pipe diameter.

  FIG. 7 shows an example of a conventional compression joint (Japanese Patent Laid-Open No. 2006-125523). In the compression joint 1, a flange portion 7 is integrally provided on the outer periphery of a cylindrical main body portion, and a compression ring 6 is fitted to the flange portion 7. The compression ring 6 is coaxial with the pipe connection 2. The resin pipe P is inserted into the gap between the pipe connecting portion 2 and the compression ring 6, and the compression ring 6 is compressed (caulked) using a dedicated tool. If it does so, the inner surface of the resin pipe P will be strongly pressed with respect to the water stop packing 4 with which the outer periphery of the pipe connection part 2 was mounted | worn, the resin pipe P will be fixed, and water stop performance will be acquired. In this conventional example, the compression ring 6 and the piping compression joint main body are separate. The compression ring 6 is attached to the compression joint main body for piping by fitting the proximal end of the compression ring 6 tightly into the circumferential groove 5 on the inner peripheral side of the flange 7.

  In this compression joint, a large crimping tool is required to crimp the compression ring 6. Further, it is necessary to use an expensive stainless steel product as the compression ring, which is expensive.

  Japanese Patent Laid-Open No. 11-94168 (Patent 3333435) describes a cap nut joint using a cap nut. This cap nut joint has a large metal part and a high material cost. In addition, there is a disadvantage that it is necessary to apply a large torque to tighten the cap nut.

  Japanese Patent Laid-Open No. 2000-46282 (Patent No. 2920146) describes a joint using a lock ring, but has a large number of parts. In addition, it is necessary to provide a transparent resin or a peephole to confirm insertion.

JP 2006-125523 A JP-A-11-94168 JP 2000-46282 A

  An object of the present invention is to solve the above-mentioned conventional problems, provide a joint for piping that can be easily connected with a small number of parts constituting the joint, and a joint structure using the joint for piping. It is what.

  The pipe joint according to claim 1 has a pipe connection part on one end side, an apparatus connection part on the other end side, and a pipe joint in which a resin pipe is fitted on the pipe connection part. An O-ring mounting groove is provided on the outer peripheral surface on the distal end side of the portion, and a protrusion for locking the inner peripheral surface of the resin tube is provided on the outer peripheral surface on the proximal end side. is there.

  According to a second aspect of the present invention, there is provided the pipe joint according to the first aspect, wherein the protrusion has a tapered inclined surface whose diameter is reduced toward a tip end side of the pipe connection portion.

  The joint for piping according to claim 3 is characterized in that, in claim 2, a cylindrical surface exists between the protrusions.

Pipe joint according to claim 4, in any one of claims 1 to 3, the outer diameter D ₂ of the portion along the trailing edge of the O-ring mounting groove of the pipe connection part of a portion along the front edge it is characterized in that larger than the outer diameter D _1.

  A joint structure according to a fifth aspect includes a piping joint according to any one of claims 1 to 4, a resin pipe externally fitted to a pipe connecting portion of the piping joint, and the resin pipe being fastened from the outer periphery. And a band for locking the inner peripheral surface of the tube to the protrusion.

  In the pipe joint and joint structure of the present invention, the pipe joint and the resin pipe are connected by simply fitting a resin pipe to the pipe connection portion and tightening the resin pipe from the outer periphery with a band. An O-ring is provided on the distal end side of the pipe connection portion, and the water stoppage is good. A protrusion is extended in the circumferential direction on the base end side of the pipe connection portion, and the protrusion protrudes into the inner peripheral surface of the resin tube, thereby preventing the resin tube from coming off.

  The piping joint and joint structure of the present invention have a small number of parts and a simple structure. In addition, the connecting operation of the resin pipe to the piping joint is simple.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the joint for piping which concerns on embodiment, (a) A figure is sectional drawing of a joint axial center direction, (b) A figure is the side view, (c) A figure is CC of figure (a). It is an arrow view. It is sectional drawing of the joint structure which connected the resin pipe to the joint for piping of FIG. It is a perspective view of a band. It is a block diagram of the joint for piping which concerns on another embodiment, (a) A figure is sectional drawing of a joint axial direction, (b) A figure is the side view, (c) A figure is C of (a) figure FIG. It is sectional drawing of the outer peripheral surface of the coupling for piping. It is a block diagram of the joint for piping which concerns on another embodiment, (a) A figure is sectional drawing of a joint axial center direction, (b) A figure is the side view, (c) A figure is (a) figure It is CC arrow line view. It is sectional drawing of the conventional compression joint for piping. It is a block diagram of the joint for piping which concerns on another embodiment, (a) A figure is a rear view by the side of the connection part to an apparatus etc., (b) A figure is a side view. It is the IX-IX sectional view taken on the line of FIG. FIG. 10 is an enlarged view of a part of FIG. 9.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a sectional view of a piping joint 10 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a state in which the pipe 30 is connected to the pipe joint 10, and FIG. 3 is a perspective view of the band.

  The pipe joint 10 has a substantially cylindrical shape having an inner hole 14, one end side thereof is a pipe connection part 11, and the other end side is a connection part 12 to a device or the like. Is the hexagonal portion 13. Although the external thread is provided in the outer peripheral surface of the connection part 12 to this apparatus etc., the securing groove (not shown) of fasteners, such as a quick fastener, may be provided.

  A mounting groove 15 for an O-ring 19 (FIG. 2) is provided on the outer peripheral surface on the distal end side of the pipe connection portion 11, and a pipe (resin pipe in this embodiment) 30 is engaged on the outer peripheral surface on the proximal end side. A protrusion 16 for stopping is provided.

  In this embodiment, two mounting grooves 15 are provided, but may be one or three or more. Usually, about 2 to 3 strips are suitable.

  The protrusion 16 is formed of a ridge that goes around the outer periphery of the pipe connection portion 11. The protrusion 16 has a taper shape with a diameter decreasing toward the distal end side of the pipe connection portion 11. In this embodiment, the protrusion 16 has a right-angled triangle cross section in the axial center line direction of the pipe joint 10, the distal end side of the pipe connecting part 11 is an inclined surface, and the proximal end side is the axial center line. It is a vertical surface. Although two protrusions 16 are provided in this embodiment, the protrusion 16 is not limited to this. The interval between the protrusions 16 is preferably about 1 to 5 mm, particularly about 2 to 3 mm. The height of the protrusion 16 is preferably about 5 to 15%, particularly about 8 to 12% of the outer diameter.

  The resin pipe 30 is an aluminum three-layer pipe in this embodiment, and has a resin inner layer, an intermediate aluminum layer, and a resin outer layer, but is not limited thereto. As the resin, cross-linked polyethylene, heat-resistant polyethylene, polybutene and the like are suitable.

  The piping joint 10 is preferably made of a copper alloy such as brass. The pipe joint 10 is preferably manufactured by cutting a copper alloy tubular material, but the material and manufacturing method of the pipe joint 10 are not limited thereto.

  In order to connect the resin pipe 30 to the pipe joint 10, the O-ring 17 is mounted in each mounting groove 15, and the resin pipe 30 is inserted into the pipe connection portion 11 and externally fitted. The insertion is preferably performed using a resin pipe insertion tool called a smoother (trade name). After inserting the resin tube 30 until the tip of the resin tube 30 comes into contact with the hexagonal portion 13, the band 40 is attached to the outer periphery of the resin tube 30, the resin tube 30 is tightened, and the protrusion 16 is bitten into the inner peripheral surface thereof. . In addition, the band 40 is previously fitted to the resin tube 30 at a position separated from the front end of the outer fitting by a required distance (the length of the pipe connection portion 11) or more, and after the resin tube 30 is inserted, the band connection portion 11 Move to the proximal side.

  The band 40 includes a ring portion 41 and knob portions 42 and 43 provided at both ends of the ring portion 41, respectively. A slit 44 extends in the circumferential direction on one end side of the ring portion 11, and a small tongue piece portion 45 on the other end side of the ring portion 41 enters the slit 44. A knob portion 43 is provided at the tip of the tongue piece portion 45. The knob portions 42 and 43 are erected in a substantially radial direction away from the center of the ring portion 41. The operator pinches the knob portions 42 and 43 with a finger or a tool and moves the knob portions 42 and 43 in the approaching direction, thereby expanding the diameter of the ring portion 41. When a finger or a tool is released from the knob portions 42 and 43, the ring portion 41 is reduced in diameter by its own elasticity, and the resin tube 30 is tightened.

  In FIG. 3, the ring portion 41 is single, but a double band having a double ring shape may be used.

  As described above, the pipe joint 10 has the pipe connection part 11, the equipment connection part 12, and the hexagonal part 13, and is provided with the mounting groove 15 and the protrusion 16 in the pipe connection part 11. Simple. In addition, the resin pipe 30 can be easily connected by simply inserting the resin pipe 30 into the pipe connecting portion 11 and fastening the resin pipe 30 with the band 40. In this pipe connection structure, the inner peripheral surface of the resin pipe 30 is strongly pressed against the O-ring 17 and the water stoppage is also good.

[Another embodiment]
In FIG. 1, between the protrusions 16 is a cylindrical surface having an equal diameter in the axial direction of the pipe connection portion 11, but the pipe joint 10 </ b> A in FIGS. 4 and 5 (a) Thus, you may provide the bamboo shoot-like protrusion 17 without a cylindrical surface. As shown in FIG. 5 (a), the protrusion 17 includes a gentle slope 17a and a vertical plane substantially perpendicular to the axial direction, as the cross section in the axial direction of the pipe joint 10A is enlarged. 17b, and the end of the inclined surface 17a of one protrusion 17 reaches the vertical surface 17b of the adjacent protrusion 17. However, as shown in FIG. 5 (b), a slight cylindrical surface 17c may exist between the adjacent protrusions 17 and 17. When the cylindrical surface 17c is provided in this manner, the inner peripheral surface of the resin tube 30 comes into contact with the cylindrical surface 17c, and the water stoppage is improved.

  In the pipe joint 10B of FIG. 6, the protrusion 18 on the outer peripheral surface of the pipe connection part 11B has a spiral shape.

  Other configurations in FIGS. 4 and 6 are the same as those in FIG. 1, and the same reference numerals denote the same parts. The pipe joints 10A and 10B having the protrusions 17 and 18 can achieve the same effects as the pipe joint 10 described above.

  8 is a rear view and a side view of a piping joint 20 according to still another embodiment of the present invention, FIG. 9 is a cross-sectional view taken along the line IX-IX of FIG. 8, and FIG. It is an enlarged view of a part.

  The pipe joint 20 is substantially cylindrical with an inner hole 24, one end side of which is a pipe connection part 21, and the other end side is a connection part 22 to a device or the like. Is a square portion 23. A groove 22a into which an O-ring is inserted is provided on the outer peripheral surface of the connecting portion 22 to the device or the like, but a male screw may be provided as in the embodiment of FIGS. The pipe joint 20 is made of PPS (polyphenylene sulfide), but the material is not limited to this.

  An O-ring mounting groove 25 is provided on the outer peripheral surface on the distal end side of the pipe connecting portion 21, and the pipe 30 (not shown in FIGS. 8 to 10) is locked on the outer peripheral surface on the proximal end side. The protrusion 26 is provided. In this embodiment, one O-ring mounting groove 25 is provided.

As shown in FIG. 10, the outer diameter D ₁ on the rear edge side of the O-ring mounting groove 25, that is, on the connection portion 22 side to the equipment or the like in the pipe connection portion 21 is larger than the outer diameter D ₂ on the front edge side, that is, the front end side. This is to prevent the O-ring from coming off when the pipe 30 is inserted into the pipe connection portion 21. Difference between D ₁ and _{D 2} are 0.1~0.5mm especially about 0.1~0.2mm are preferred. In this embodiment, D ₁ = 11.9 mm, D ₂ = 11.7 mm, and D ₂ -D ₁ = 0.2 mm.

The protrusion 26 is formed of a ridge that spirals around the outer periphery of the pipe connection portion 21. In this embodiment, the protrusion 26 has a triangular cross section in the axial center direction of the pipe joint 10, the front end side of the pipe connection part 21 is a slanted slope, and the rear end side is the axis. It is a steep slope that is almost perpendicular to the line. In this embodiment, θ ₁ in the figure is preferably 45 to 90 °, particularly preferably about 60 °, and θ ₂ is preferably 0 to 45 °, particularly preferably about 15 °. In the case of a synthetic resin pipe joint, the sharpness of the corner edge is smaller than that of a metal pipe joint, the protrusion 26 bites into the resin pipe, and the pipe 30 is easily removed. Thus, θ ₂ is reduced to prevent the piping 30 from coming off. The pitch P between the protrusions 26 is preferably about 1.5 to 2 mm. The height h of the protrusion is preferably about 0.3 to 0.5 mm.

  In this embodiment, a quadrangular square portion 23 is provided instead of the hexagonal hexagonal portion 13 in the above-described embodiment. A tool such as a spanner is engaged with the flat portion 23 f on the outer periphery of the square portion 23. In order to put a pipe connection clip (not shown) on the square portion 23, the four projecting corner portions of the square portion 23 are arc-shaped portions 23r.

  This joint 20 for piping is used similarly to the joint for piping of the said embodiment except connecting the connection part 22 with respect to a connection other party member using a piping connection clip. In addition, you may make it use a union nut instead of the connection system by a piping connection clip.

  The above-described embodiment is an example of the present invention, and the present invention may be configured other than illustrated. For example, the protrusions 16, 17, 18, and 26 are not limited to have the same protruding height, but are configured such that the closer to the hexagonal part 13 or the rectangular part 23, the higher the height. Also good. As a specific example, in FIGS. 4 (a) and (b), the outer diameter of the right protrusion 17 is 12.7 mm, and the outer diameter of the left protrusion 17 is 12.8 mm. The thing which was done is mentioned. When comprised in this way, the effect that the resin pipe | tube 30 becomes still stronger with respect to extraction is acquired.

10, 20 Fittings 11, 21 Pipe connection part 12, 22 Equipment connection part 13 Hexagon part 15, 22a, 25 O-ring mounting groove 16, 17, 18, 26 Protrusion part 19 O-ring 23 Square part 30 Resin pipe 40, 50 Band

Claims (5)

It has a pipe connection on one end and a device connection on the other end,
In a pipe joint in which a resin pipe is fitted on the pipe connection part,
An O-ring mounting groove is provided on the outer peripheral surface on the distal end side of the pipe connection portion, and a protrusion for locking the inner peripheral surface of the resin pipe is provided on the outer peripheral surface on the proximal end side. Pipe fittings to be used.   The pipe joint according to claim 1, wherein the protrusion has a tapered inclined surface whose diameter is reduced toward a distal end side of the pipe connection part.   3. A pipe joint according to claim 2, wherein a cylindrical surface exists between the protrusions. In any one of claims 1 to 3, the outer diameter D ₂ of the portion along the trailing edge of the O-ring mounting groove is larger than the outer diameter D ₁ of the portion along the front edge of the pipe connecting portion A fitting for piping. A joint for piping according to any one of claims 1 to 4,
A resin pipe externally fitted to the pipe connection portion of the pipe joint;
A joint structure comprising: a band that tightens the resin tube from the outer periphery and holds the inner peripheral surface of the resin tube to the protrusion.

Images