JP4406134B2 - Resin pipe fitting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a joint including a tubular fitting region portion into which an extended end portion of a resin pipe is fitted on at least one end side, and an overhanging portion projecting radially outward on the inner side in the axial direction of the fitting region portion. A main body and a press-fit insertion type pressing sleeve that presses and fixes the resin pipe fitted in the fitting region portion of the joint main body from the outside to the fitting region portion, and the fitting region portion includes a plurality of circumferential directions. The present invention relates to a resin pipe joint including a rib.
[0002]
[Prior art]
The resin pipe joint described at the beginning is known from Japanese Patent Publication No. 4-56198, for example. As shown in the side view of FIG. 4 with a partial cross section of the upper half, the resin pipe joint 20 disclosed in the publication has a metal joint body 21 and a metal pressing sleeve 22. The joint body 21 includes a tubular fitting region portion 23 into which the expansion portion of the resin pipe A is fitted on one end side, and a flange 24 that projects outward in the radial direction on the inner side in the axis X direction of the fitting region portion 23. . The fitting region portion 23 includes a plurality of ribs 25 in the illustrated example.
[0003]
The resin pipe joint 20 is characterized by a pressing sleeve 22, that is, the pressing sleeve 22 has a conical turning portion 26 and a cylindrical inner peripheral surface 27 adjacent to the turning portion 26 interposed at the inner edge of the insertion tip portion. And an inner diameter expansion portion 28 provided at a predetermined position.
[0004]
The resin pipe A is coupled to the resin pipe joint 20 as follows. That is, the expansion portion at the end of the resin pipe A that has been expanded to a predetermined inner diameter dimension is fitted into the fitting region portion 23, and in this state, the pressing sleeve 22 inserted around the non-expanded portion of the resin pipe A by the pushing device. Is pressed into the flange 24 and pressed against the flange 24 while pressing the outer peripheral surface of the resin pipe A expansion portion located on the fitting region 23.
[0005]
Since the inner diameter of the pressing sleeve 22 is smaller than the outer diameter of the expanded portion of the resin pipe A by a predetermined amount, the end portion of the resin pipe A on the fitting region portion 23 is compressed radially inward with the press-fitting insertion of the pressing sleeve 22. Then, the gaps between the ribs 25 are filled and pushed out in the direction of the axis X. As a result, when the pressing sleeve 22 comes into contact with the flange 24, the resin extruded in the direction of the axis X extends into the space of the conical turning portion 26 of the pressing sleeve 22 and the inner diameter expanding portion 28. Accordingly, the inner side of the resin pipe A is fixed by the fitting region 23 and the outer side of the resin pipe A is fixed by the pressing sleeve 22 and is coupled to the joint.
[0006]
[Problems to be solved by the invention]
It is certain that the above-described resin pipe joint 20 is excellent as a strong coupling device for the resin pipe A. However, on the other hand, in most cases, the pressing sleeve 22 contacts the flange 24 when the coupling is completed. Therefore, at least in appearance, both the space of the conical turning portion 26 and the space of the inner diameter expansion portion 28 are sufficiently full. It is impossible to judge whether or not a sufficient amount of resin is filled. Of course, an appropriate inner diameter dimension of the pressing sleeve 22 is set in advance. However, considering the resin material, the temperature change during the work, and the dispersion of the work itself, each time the resin pipe is joined from the viewpoint of quality assurance, it is sufficient. It is necessary to confirm the correct coupling state.
[0007]
In addition, since a relatively large gap exists between the pressing sleeve 22 and the resin pipe A after the resin pipe A is joined to the resin pipe joint 20, the resin pipe A is bent when the resin pipe A is bent from the position of the fixed joint 20. A hits the edge of the pressing sleeve 22, and stress concentrates on the contacted portion and the portion facing it, and sometimes these portions may be damaged.
[0008]
Therefore, the invention described in the first to fourth aspects of the present invention can completely eliminate the above-described problems, firmly bond the resin pipe to the joint, and visually confirm the bonding state. An object of the present invention is to provide a resin pipe joint that does not cause damage even if the resin pipe in the joint portion is bent.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 of the present invention is the resin pipe joint described in the beginning,
The pressing sleeve has a curved surface that protrudes outward over the entire circumference on the inner edge surface of the front end in the insertion direction,
The overhang portion of the joint body has a curved surface that is concave outward on the entire surface of the overhang base portion on the fitting region side,
The curved surface of the surface of the overhang base has a curvature that guides the distal end of the resin pipe located in the fitting region portion radially outward along the side of the overhang portion, corresponding to the press-fitting insertion toward the overhang portion of the pressing sleeve. It is the resin pipe joint characterized by having.
[0010]
Regarding the invention described in claim 1, as in the invention described in claim 2, when the press-fit insertion toward the projecting portion of the pressing sleeve is completed, the front end inner edge curved surface and the projecting base curved surface of the pressing sleeve are resin pipes. They have a positional relationship of being spaced apart from each other through the thickness of the tip portion.
[0011]
With respect to the invention described in claims 1 and 2, as in the invention described in claim 3, a tension is applied in a cross section by a plane including the axis of the fitting region portion of the joint body and a cross section by a plane including the axis of the pressing sleeve. The projecting base curved surface on the fitting region side of the projecting portion and the front edge inner edge curved surface of the pressing sleeve each have an arc shape, and the projecting base arc is equal to or larger than the curvature radius of the front end inner edge arc of the pressing sleeve. Has a radius of curvature.
[0012]
With respect to the invention described in any one of claims 1 to 3, as in the invention described in claim 4, the pressing sleeve has a tapered surface that tapers outward toward the inner surface of the rear end portion in the insertion direction. .
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a side view of the upper half cross section of a resin pipe joint according to the present invention, in which resin pipe connection is completed,
FIG. 2 is a side view of the upper half section of the resin pipe joint body according to the present invention,
FIG. 3 is a side view of the upper half section of the pressing sleeve of the resin pipe joint according to the present invention.
[0014]
1 to 3, the resin pipe joint 1 includes a joint body 2 and a tubular pressing sleeve 3 separate from the joint body 2. The joint body 2 has a tubular fitting region portion 5 into which an expanded end portion 4a (indicated by a two-dot chain line in FIG. 1) of the resin pipe 4 is fitted at least on one end side, and in the illustrated example on one end side, It has the overhang | projection part 6 overhang | projecting to a radial direction outer side in the axis line X direction of the area | region part 5. As shown in FIG. The joint body 2 and the pressing sleeve 3 are made of metal such as bronze or steel, and the resin pipe 4 is made of, for example, crosslinked polyethylene.
[0015]
The fitting region 2 of the joint body 2 includes a plurality of, in the illustrated example, three ribs 7 and a fitting stop surface 8, and the extended end 4 a of the resin pipe 4 can be fitted onto these ribs 7. As shown by a two-dot chain line in FIG. 2, it is possible to fit to a position where it is brought into contact with the fitting stop surface 8. On the other hand, the pressing sleeve 3 has a minimum inner diameter Dmin that allows the non-expanded portion of the resin pipe 4 to slide in the longitudinal direction, and is smaller than the outer diameter of the expanded end portion 4a fitted on the fitting region portion 5, In addition, the inner diameter Dis of the cylindrical inner surface 3is is larger than the minimum inner diameter Dmin.
[0016]
The pressing sleeve 3 positioned around the non-expanded portion of the resin pipe 4 is moved in the direction of the arrow x shown in FIG. 3, and is press-inserted from the outside of the extended end portion 4a on the fitting region portion 5 shown in FIG. As a result, the expansion end portion 4a is pressed and fixed to the fitting region portion 5, and the pressing sleeve 3 itself remains there.
[0017]
Here, as shown in FIG.1 and FIG.3, the press sleeve 3 shall have the curved surface 10 which makes a convex toward the outer side in the front edge part inner edge of the insertion direction shown by the arrow x. In other words, the curved sleeve 10 is trimmed at the inner end of the front end of the pressing sleeve 3. The curved surface 10 extends over the entire circumference of the inner edge of the front end of the pressing sleeve 3.
[0018]
On the other hand, as shown in FIG.1 and FIG.2, the overhang | projection part 6 of the coupling main body 2 shall have the curved surface 11 which makes a concave toward the outer side in the overhang | projection base surface of the fitting area | region part 5 side. . The curved surface 11 also extends over the entire circumference of the overhanging base surface. The curved surface 11 of the overhanging base portion has a curvature described below.
[0019]
That is, in response to the press-fitting insertion of the pressing sleeve 3 in the direction of the arrow x toward the overhanging portion 6, the expanded end portion 4 a of the resin pipe 4 located in the fitting region portion 5 moves toward the overhanging portion 6. At the same time, the wall thickness decreases and is squeezed out in the insertion direction. This squeezing assists the movement of the distal end of the extended end 4a in the insertion direction. Therefore, the curved surface 11 of the overhanging base portion is given a curvature of a size that reliably guides the distal end of the extended end portion 4a, which advances by movement and squeezing, radially outward along the side surface of the overhanging portion 6. Is.
[0020]
In the resin pipe joint 1 having the above-described configuration, after the resin pipe 4 is completely joined, the distal end portion of the expanded end portion 4a of the resin pipe 4 is at least a tension between the distal end surface F of the pressing sleeve 3 and the fitting region portion 5 side. It is located in the gap X direction C between the side surfaces of the protruding portion 6. However, as shown in FIG. 1, it is preferable to adjust the inner diameter Dis of the cylindrical inner surface 3 is of the pressing sleeve 3 so that the tip of the extended end 4 a covers the outer peripheral surface of the front end of the pressing sleeve 3.
[0021]
In such a resin pipe joint 1, whether or not the distal end portion of the expanded end portion 4a of the resin pipe 4 is located in the gap C, and whether or not the distal end portion of the expanded end portion 4a is sufficiently raised. Can be visually confirmed. In particular, as shown in FIG. 1, if the distal end portion of the extended end portion 4 a is sufficiently raised, it means that the resin pipe 4 is sufficiently coupled to the joint 1. Thereby, the joint quality of the resin pipe 4 can be guaranteed.
[0022]
On the other hand, if the end of the extended end 4a does not exist at the above position or if the bulge cannot be visually confirmed, it means that the connection is insufficient. Excessive bulging leads to excessive pressing, suggesting the possibility of cutting the extended end 4a. Accordingly, it is possible to easily and appropriately evaluate the bonding quality of the resin pipe 4 to the joint 1. If the coupling quality is poor, the inner diameter Dis of the cylindrical inner surface 3is of the pressing sleeve 3 may be adjusted appropriately.
[0023]
Therefore, in the joint 1, when the press-fit insertion toward the projecting portion 6 of the pressing sleeve 3 is completed, the front end inner edge curved surface 10 of the pressing sleeve 3 and the curved surface 11 of the projecting base portion are made of resin as shown in FIG. The pipe 4 has a positional relationship of being separated from each other through the thickness of the tip end portion. In relation to the above, the volume of the extended end portion 4a surrounded by the two-dot chain line located between the start end 5E of the fitting region portion 5 and the fitting stop surface 8 shown in FIG. 1 is shown in FIG. It is preferably about 80% of the volume of the extended end portion 4a located between the start end 5E and the stop surface 8.
[0024]
In relation to the above, in the cross section of the joint main body 2 and the pressing sleeve 3 shown in FIGS. 1 to 3, the front end inner edge curved surface 10 of the pressing sleeve 3 and the overhanging base portion on the fitting region portion 5 side of the overhanging portion 6. Each curved surface 11 has an arc shape. The entire curved surfaces 10 and 11 are formed by one or more arcs. In the illustrated example, the entire curved surfaces 10 and 11 are one arc.
[0025]
Here, as seen in the illustrated example, the arc of the overhanging base curved surface 11 has a curvature radius R (mm) equal to or greater than the curvature radius r (mm) of the arc of the front end inner edge curved surface of the pressing sleeve 3. That is, R (mm) ≧ r (mm). In the case of two or more complex arcs, the curve is a smooth curve having a common tangent, and the values of the main arc are adopted as the radii of curvature r and R. The centers of the radii of curvature r and R are coincident or located very close to each other. In this way, the tip of the resin pipe 3 can be guided smoothly and smoothly by the curved surfaces 10 and 11 without damaging, thereby contributing to bending deformation. Note that a flat portion perpendicular to the axis X may be provided on the front end face F of the pressing sleeve 3.
[0026]
Further, as shown in FIG. 3, the pressing sleeve 3 has a taper surface 3ts that tapers outward on the inner surface of the rear end portion in the insertion direction. Referring to FIG. 1, the tapered surface 3 ts of the pressing sleeve 3 forms an inclined surface that substantially conforms to the shape of the expanded transition region of the resin pipe 4 between the non-expanded portion of the resin pipe 4 and the start end of the expanded end portion 4 a. As a result, even if the gap between the end E of the pressing sleeve 3 and the resin pipe 4 is minimized and the resin pipe 4 is bent with respect to the joint 1, the radius of curvature of the resin pipe 4 increases, and the end of the pressing sleeve 3 is increased. It is possible to prevent damage to the resin pipe 4 part contacting the inner edge surface of E and the part facing the resin pipe 4 part. In this sense, it is preferable that the tip of the tapered surface 3ts is a cylindrical surface 3fs.
[0027]
The resin pipe joint 1 shown in FIG. 1 is a straight type provided with a pipe screw 15 on the side opposite to the fitting region portion 5. In the straight type, the fitting is provided with the fitting region portion 5 on both sides. You can also. Moreover, the structure of the above-mentioned joint 1 shall be applied to an elbow joint, a T-shaped joint, and a cross joint. In the case of the joint 1 including the pipe screw 15, it is necessary to rotate the joint 1 with respect to the counterpart to be screwed. Therefore, the overhanging portion 6 has at least a pair of parallel plane portions at the outer periphery facing position. In addition, you may provide the groove | channel thru | or recessed part engaged with the nail | claw of a pushing apparatus in the press sleeve 3. FIG.
[0028]
【Example】
It is the resin pipe joint 1 of the structure shown in FIGS. 1-3, the joint main body 2 and the press sleeve 3 are made of bronze, and the resin pipe 4 is made of crosslinked polyethylene. The dimensions of the joint body 2 are as follows.
Total length: 37.5mm,
The outer radial width excluding the curved surface 11 of the overhang portion 6: 7 mm,
Length from this width end to the end of the fitting region 5: 15.5 mm,
Maximum outer diameter of fitting region portion 5 (outer diameter of rib 7): 14.2 mm,
Recess depth between ribs 7: 0.3 mm,
Insertion stop surface 8 outer diameter: 15.2 mm,
Curvature radius R of curved surface 11 in cross section: 3.0 mm.
[0029]
The dimensions of the pressing sleeve 3 are as follows.
Total length: 24mm,
Outer diameter: 22.7 mm,
Inner diameter Dis of cylindrical inner surface 3is: 17.8 mm,
Length of tapered surface 3ts: 3mm,
Length of cylindrical surface 3fs: 2mm
Minimum inner diameter (inner diameter of cylindrical surface 3fs) Dmin: 17.3mm,
Radius of curvature r of the arc of the front end inner edge curved surface 10 in the cross section: 2.6 mm,
The radial length of the tip surface F: 1 mm.
[0030]
The inner diameter of the expanded end 4a of the resin pipe 4 having an outer diameter of 17.0 mm and an inner diameter of 12.2 mm is set to about 15 mm, and the expanded end 4a is fitted into the fitting region 5 from the start end 5E to the stop surface 8 in advance. The pressing sleeve 3 that had been positioned on the non-expanded portion of the resin pipe 4 was press-fitted and inserted into the overhanging portion 6 by a pressing device.
[0031]
As a result, as shown in the sectional view of FIG. 1, the extended end 4 a of the resin pipe 4 fills all the recesses between the ribs 7, and the tip of the resin pipe 4 covers the outer peripheral surface of the tip of the pressing sleeve 3. It rises until it covers. The gap C in the axis X direction at this time was about 3 mm. When the joint 1 in this state is used for a hot water supply facility at 90 to 100 ° C. for a long period of time, water leakage from the joint 1 portion is not seen, and there are also problems such as dropping of the pressing sleeve 3 and disconnection of the resin pipe 4. I couldn't see it. Even when the resin pipe 4 is bent frequently with respect to the fixed joint 1 for a long period of time, there is no defect such as a crack in the base portion of the joint 1 of the resin pipe 4.
[0032]
【The invention's effect】
According to the inventions described in claims 1 to 4 of the present invention, the resin pipe can be firmly bonded to the joint, and the quality of this bonded state can be confirmed visually. It is possible to provide a highly reliable resin pipe joint that can be assured with quality and has improved breakage resistance of the resin pipe in the joint portion.
[Brief description of the drawings]
FIG. 1 is a side view of an upper half section of a resin pipe joint according to the present invention in which resin pipe coupling is completed.
FIG. 2 is a side view of the upper half section of the resin pipe joint main body according to the present invention.
FIG. 3 is a side view of the upper half section of the pressing sleeve of the resin pipe joint according to the present invention.
FIG. 4 is a side view of an upper half section of a main part of a conventional resin pipe joint.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Resin pipe joint 2 Joint main body 3 Press sleeve 3is Cylindrical inner surface 3ts Tapered surface 3fs Cylindrical surface 4 Resin pipe 4a Expansion end part 5 Insertion area part 5E Insertion area part start end 6 Overhang part 7 Rib 8 Insertion stop surface 10 Press Inner curved surface 11 of the front end of the sleeve Overhanging base curved surface 15 of the overhanging portion Tube screw X Joint axis x Insertion direction R The radius of curvature r of the arc of the overhanging base curved surface F The radius of curvature of the arc of the inner end curved surface of the front end F Sleeve end Dis Cylinder inner diameter Dmin Press sleeve minimum inner diameter

Claims (4)

A joint body provided with a tubular fitting region portion into which an extended end portion of the resin pipe is fitted at least on one end side, and an overhanging portion projecting radially outward on the axially inner side of the fitting region portion; There is a press-fit insertion type pressing sleeve that presses and fixes the resin pipe fitted in the fitting region portion of the joint body from the outside in the axial direction to the fitting region portion, and the fitting region portion has a plurality of circumferential ribs. In the resin pipe joint provided, the pressing sleeve has a curved surface that protrudes outward over the entire circumference on the inner edge surface of the front end portion in the insertion direction, and the overhang portion of the joint body is on the side of the fitting region portion. The surface of the overhanging base portion has a curved surface that is concave outward along the entire circumference, and the curved surface of the overhanging base surface is a resin located in the fitting region corresponding to the press-fitting insertion toward the overhanging portion of the pressing sleeve. Radiating the pipe tip along the side of the overhang Plastic pipe fittings, characterized in that it has a curvature for guiding outward. 2. The press-insertion completion toward the overhanging portion of the pressing sleeve has a positional relationship in which the front end inner surface curved surface and the overhanging base curved surface of the pressing sleeve are spaced apart from each other via the thickness of the distal end portion of the resin pipe. Resin pipe fitting. In the cross section by the plane including the axis of the fitting area of the joint body and the cross section by the plane including the axis of the pressing sleeve, the protruding base curved surface of the protruding section on the side of the inserting area and the inner edge curved surface of the front end of the pressing sleeve The resin pipe joint according to claim 1 or 2, wherein each has an arc shape, and the overhanging base arc has a radius of curvature equal to or greater than the radius of curvature of the inner edge arc of the front end of the pressing sleeve. 4. The resin pipe according to claim 1, wherein the pressing sleeve has a taper surface tapered outward toward an inner surface at a rear end portion in the insertion direction. 5.

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