KR102217110B1 - Pipe joint consisting of resin, and clamp jig - Google Patents

Abstract

The resin pipe joint 1 of the present invention includes a joint body 3 having an inner flow path 2 for flowing a fluid, and a weld end 4 formed at the opening of the joint body 3 As a result, on the outer circumferential surface of the joint body portion 3, at a position deviating from the central axis CL of the inner flow path 2 of the joint body portion 3, the insertion and holding portion of the clamp jig 51 ( It is constituted by providing at least one positioning portion 5 that fits into the positioning engaging portion 54 provided on at least one of the surfaces 53a and 52a facing each other.

Description

Resin pipe joint and clamp jig {PIPE JOINT CONSISTING OF RESIN, AND CLAMP JIG}

In the present invention, a joint body portion having an inner flow path, a resin pipe joint having a welded end portion formed at an opening portion of the joint body portion, and a butt welding of each end portion of a resin pipe joint and a resin tube member, etc. In the box, it relates to a clamp jig that holds a resin pipe joint, and in particular, at the time of butt welding of the end, the positioning of the resin pipe joint held by the clamp jig can be performed with high precision and reliably. It is to propose technology.

Pipes for chemical liquid transport lines used in various industries are welded by bonding each end of a resin pipe joint composed of thermoplastic resin, etc., and a resin tube member or other resin pipe joint using a welding machine. There is something made up.

More specifically, for example, in each of the clamp jigs in which the welding machine is paired, the end portions of the resin pipe joints and the ends of the resin tube members face each other, and these resin pipe joints and resin pipe joints Each of the tube members and the like is held.

Subsequently, both ends of the resin pipe joint and the resin tube member held by the clamp jig are heated with a heater or other heating device to melt these ends, and in that state, the resin pipe joint and the resin tube member The backs are brought close to each other, and these ends are welded butted by the required pressure action.

As a technology focused on butt welding of such a joint end, Patent Document 1 discloses ``a number of welding ring-shaped parts in communication with the flow path in the joint base are provided in the joint base, and at least one welding ring of the welding ring-shaped parts A resin-made cross-section butt joint” is disclosed, wherein a fixing portion for a welder clamp is provided on the same axis of the shape portion and at the outer end of the joint base portion. In addition, according to this ``resin end face butt joint'', ``without using a fixing jig, it is possible to fasten and fix on the same axis with a clamp of a conventional welding machine and at an appropriate core size, It is possible to reliably and easily weld joints of various thermoplastic resins having a welding ring-shaped part. In particular, since the shortest welding of the joints is possible, it is possible to cope with the miniaturization of the device itself, and also the reduction of the piping space and compactness. It can contribute significantly to anger.”

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2013-103363

However, in the case of butt-welding each end of a resin pipe joint, etc., when the clamp jig of the welding machine is inserted and maintained between the flat surfaces facing each other, the resin pipe joint of the smooth outer circumferential surface is inserted from both sides. Prior to this, it is necessary to match the central axes of the inner flow paths with high precision at each end position such as a resin pipe joint and a resin tube member to be welded to each other.

In other words, if these ends are welded while the central axis of the inner flow path at each end position does not coincide, there is a large step difference in the inner surface of the boundary pipe between the resin pipe joint and the resin tube member connected by welding. This is because, as a result of the occurrence of, in particular, in addition to impeding the smooth passage of liquid, liquid condensation occurs there, and there are various adverse effects on the quality of the pipeline, such as the residence of particles that may be contained in the liquid.

However, in this case, when a resin pipe joint or the like is inserted between the facing surfaces of the clamp jig, there is a problem that the alignment work performed to match the central axis of the inner flow path increases the number of steps and work time.

On the other hand, when the alignment of the central axis is not made reliably, the quality of the pipeline is deteriorated as described above.

In addition, in Patent Document 1, in a so-called elbow-shaped joint in which the inner flow path is curved by about 90° in the middle, on the outer circumferential surface outside the curved portion of the joint, at a position along the extension line of the central axis in the linear portion of the inner flow path. A fixing part for a welding machine clamp was provided, and the fixing part was clamped by a clamp jig, but in this patent document 1, only the fixing part provided on the extension line of the central axis is held by the clamp jig, so the weight of the joint itself Due to its central position, there is a concern that the joint held by the clamp jig in the fixed part may deviate from the expected position.

Therefore, by the proposed technique of Patent Document 1, it was not possible to form a high-quality pipeline.

The present invention aims to solve such a problem encountered in the prior art, and the object of the present invention can be reliably positioned with a high precision of a resin pipe joint held by a clamp jig. Therefore, it is to provide a resin pipe joint and clamp jig that can contribute to the improvement of the quality of the pipe and the improvement of the workability during butt welding of the ends.

The resin pipe joint of the present invention is formed in a joint body portion having an inner flow path through which a fluid flows, and an opening portion of the joint body portion, so that the end portion of the resin pipe member for piping or the end portion of another resin pipe joint In the case of welding with the resin tube member or the other resin pipe joint, the joint body portion is inserted and held between opposite surfaces of the insertion holding portion of the clamp jig, having a welding end portion to be welded, the On the outer circumferential surface of the joint body portion, at a position deviating from the central axis of the inner flow path of the joint body portion, a positioning portion fitted to each of the positioning coupling portions provided on each surface facing the insertion and retaining portion is provided, and these positions are determined. The parts are disposed in each of the outer circumferential regions located opposite to each other with the central axis of the inner flow path of the joint body part therebetween.

The "position on the outer circumferential surface of the joint main body part that deviates from the central axis of the inner flow path" means a position of the outer circumferential surface not on the central axis of the inner flow path and the extension line thereof. Accordingly, in the resin pipe joint of the present invention, the positioning portion does not exist at a position where the outer circumferential surface of the joint body portion and the central axis or its extension line intersect.

Here, in the resin pipe joint of the present invention, the positioning part is configured to enable rotational displacement of the resin pipe joint using the corresponding positioning part as a point in a state where the positioning part is fitted on each surface opposite to the insertion holding part. It is desirable.
The resin pipe joint is a resin pipe joint that is inserted and held between a flat surface facing the insertion holding unit of the clamp jig, and the positioning unit is each position provided on each of the flat surfaces facing the insertion holding unit. It is preferable to fit into the crystal joint.

In addition, here, in the resin pipe joint of the present invention, it is preferable to arrange the positioning portions on both sides of the outer circumferential surface of the joint body portion in a direction perpendicular to the central axis past the intersection of the central axes of the inner flow paths intersecting each other. .

In the resin-made pipe joint described above, it is preferable that at least one of the positioning portions is a circular convex portion or a circular concave portion having a circular shape in a planar contour shape.

In addition, in the above-described resin pipe joint, at least one of the positioning portions is one or more strip-shaped convex portions or strip-shaped concave portions whose planar contour shape extends on the outer circumferential surface of the joint body portion, and the positioning It is preferable that at least one of the portions is a circular convex portion or a circular concave portion having a circular shape in a planar contour shape, and the circular convex portion or a circular concave portion is disposed on the band-shaped convex portion or the strip-shaped concave portion.

The clamp jig of the present invention has an insertion holding portion having a surface facing each other at intervals, and in welding the ends of a resin pipe joint and a resin tube member or another resin pipe joint by butt-welding, the above At least one of the surfaces of each of the insertion and holding portions, which are in contact with the joint body portion of the resin pipe joint to be inserted and held, by inserting and holding the joint body portion of the resin pipe joint between the surfaces facing the insertion and holding portions. E, in a state where at least one positioning coupling portion fitted to the positioning portion provided on the outer circumferential surface of the joint body portion is provided, and the positioning coupling portion is fitted to the positioning portion of the resin pipe joint, the corresponding position It is configured to enable rotational displacement of the resin pipe joint using the crystal part as a point.

In the clamp jig of the present invention, it is preferable to provide a positioning engaging portion fitted to each of two or more positioning portions provided on the outer circumferential surface of the joint body portion of the resin pipe joint on each of the surfaces facing the insertion and holding portions.
Further, in the clamp jig of the present invention, it is preferable that the surface of the insertion holding portion is flat, and the positioning portion is provided on the flat surface.

In the above-described clamp jig, it is preferable to use at least one of the positioning coupling portions as a circular recessed portion or a circular protruding portion in which the planar contour shape forms a circular shape.

In addition, in the above-described clamp jig, at least one of the positioning coupling portions is one or more band-shaped depressions or band-shaped protrusions having a planar contour extending on the surface of the insertion holding portion, and the positioning coupling It is preferable that at least one of the portions is a circular depression or a circular protrusion having a circular contour shape in a planar contour, and the circular depression or circular projection is disposed on the band-shaped depression or the band-shaped projection.

In this case, the positioning coupling portion is composed of two or more band-shaped depressions or band-shaped projections extending over the surface of the insertion and retaining portion and intersecting each other, and at the same time, these band-shaped depressions or band-shaped projections It is preferable to arrange the circular depressions or circular projections above the intersection.

In addition, in the clamp jig of the present invention, it is preferable to further include a connection fixing part for attaching and detaching the clamp jig to a welding machine for butt-welding each end portion of a resin pipe joint and a resin tube member. Do.

According to the present invention, on the outer circumferential surface of the joint body portion of the resin pipe joint, at a position deviating from the central axis of the inner flow path of the joint body portion, the positioning coupling portion provided on at least one of the surfaces facing the insertion and holding portions of the clamp jig By providing one or more positioning parts to be fitted, the positioning part provided in the joint body part is fitted to the positioning part provided in the insertion and holding part of the clamp jig when held by the clamp jig, so the position expected of the resin pipe joint Is held by a clamp jig.

As a result, the positioning of the resin-made pipe joints held by the clamp jig is reliably performed with high precision, effectively improving the quality of the pipe consisting of the resin-made pipe joints and resin-made tube members welded at each end. In addition, it becomes unnecessary to position the resin pipe joints held by the clamp jig, thereby reducing the number of steps and shortening the working time.

1 is a perspective view, a plan view, and a side view showing an embodiment of a resin pipe joint of the present invention.
Fig. 2 is a perspective view showing a state before and after holding the resin pipe joint of Fig. 1 with a clamp jig.
Fig. 3 is a side view showing the resin pipe joint and clamp jig of Fig. 2 together with another resin pipe joint and clamp jig for butt-welding the end portion thereof.
4 is a perspective view showing a state in which the direction of the resin pipe joint of FIG. 2 is rotated by 90°.
5 is a plan view and a side view showing another embodiment of a resin pipe joint of the present invention.
Fig. 6 is a perspective view showing the resin pipe joint of Fig. 5 together with a clamp jig holding it.
Fig. 7 is a perspective view showing still another embodiment of a resin pipe joint of the present invention, together with a clamp jig holding it.
Fig. 8 is a schematic perspective view showing an example of a welding machine provided with a clamp jig of the present invention.
9 is a partially enlarged perspective view showing the clamp jig of the welding machine of FIG. 8.
Fig. 10 is a perspective view showing the welding machine of Fig. 8 with the clamp jig on one side removed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A resin pipe joint 1 according to an embodiment of the present invention is for constituting a part of a pipe through which a liquid such as a chemical or a gas other than a fluid flows, and as shown in FIG. It is formed in each of the three opening portions of the hollow joint body portion 3 and the joint body portion 3 having an internal flow path 2 for flowing, for example, the outer diameter of the joint body portion 3 It is comprised by providing the welding end part 4 which was made small.

As a material constituting this resin pipe joint (1), for example, perfluoroalkoxy alkanes (PFA), perfluoroethylene propene copolymer (FEP), polyether ether ketone (PEEK), etc. are mentioned. , It is also possible to use materials other than those presented here.

In addition, here, in the embodiment of Fig. 1, the joint body portion 3 forms a slightly shorter circular tubular portion extending perpendicularly to the extending direction in a central region in the middle of the extending direction of the circular tubular portion extending in one direction. As a whole, as shown in Fig. 1(b), it has a substantially T-shaped external shape when viewed in plan.

For this reason, this joint body part 3 also has a substantially T-shaped inner flow path 2 which branches bifurcated in the middle.

Here, in the present invention, among the outer circumferential surfaces of the joint body part 3, the outer circumferential surface of the inner flow path 2 is positioned on the outer circumferential surface deviating from the central axis CL indicated by the broken line in FIG. One or more positioning portions 5 of a convex shape protruding from are provided.

In this embodiment, as can be seen from the bar shown in Fig. 1(c), the two positions on the front side and the back side are located on opposite sides with the central axis CL of the inner flow path 2 interposed therebetween. A decision part 5 is provided. In addition, the symbol PL in the drawing indicates a vertical line perpendicular to the plane including the central axis CL, passing through the intersection of the central axes CL of the inner flow paths 2 that intersect each other in a T shape when viewed in a plane view. Show.

On the other hand, when the welding end 4 of the resin pipe joint 1 is welded to the end of a resin tube member or another resin pipe joint, a clamp jig 51 that holds the resin pipe joint 1 ), as shown in Fig. 2(a), each of the two plate-shaped portions 52 and 53 having a substantially flat plate shape as the insertion holding portion, respectively, the surfaces 52a and 53a facing each other at intervals. And the shape and number corresponding to the positioning portion 5 provided on the outer circumferential surface of the joint body portion 3 of the resin pipe joint 1 on each of the opposite flat surfaces 52a and 53a. A positioning coupling part 54 is provided. Although it is not clear from what is shown in FIG. 2, the positioning coupling part 54 in this embodiment is not only the surface 53a of the plate-shaped part 53 located below the figure of FIG. The clamp jig 51 is also provided in the same shape on the surface 52a of the plate-shaped portion 52 positioned above FIG. 2.

In order to hold the resin pipe joint 1 with the clamp jig 51, as shown in Figs. 2(a) and 2(b), the front and back sides provided on the joint body 3 Position each of the positioning parts 5 of the clamp jig 51 toward the corresponding positioning coupling part 54 side, and insert the resin pipe joint 1 into the surface 52a of the clamp jig 51, 53a).

At this time, since each positioning part 5 of the resin pipe joint 1 is fitted to each positioning joint 54 of the clamp jig 51, the resin pipe joint 1 is the clamp jig 51 It is placed at the expected position between the surfaces 52a and 53a and is accurately positioned. Therefore, in the resin pipe joint 1, the joint body portion 3 is centered on the central axis CL of the inner flow path 2, and the clamp jig 51 faces the surfaces 52a, 53a on both sides thereof. It is inserted by means of and is reliably maintained without misalignment.

And, in performing butt welding of the ends of other resin pipe joints for piping, etc., as shown in FIG. 3, for example, another resin pipe joint 11 is attached to a paired clamp jig 61. In the same arrangement, the end portions 4 and 14 of each of these resin pipe joints 1 and 11 are positioned so as to face each other.

Thereafter, the both ends 4 and 14 are heated and dissolved by a heating device such as a heater, and in that state, the clamp jigs 51 and 61 are relatively displaced in the horizontal direction so as to approach each other, and both ends under the required pressure The parts (4, 14) are butted to each other and welded to them by cold hardening.

In the butt welding of the end portions 4 and 14 of the resin pipe joints 1 and 11, in the present invention, the resin pipe joint 1 between the surfaces 52a and 53a facing the clamp jig 51 ) Of the joint body part 3 is inserted and held. In addition, a positioning part 5 is provided in the joint body part 3 of the resin pipe joint 1, and the clamp jig 51 By providing the positioning coupling portion 54 corresponding to the opposing surfaces 52a and 53a, the resin pipe joint 1 can be accurately positioned between the facing surfaces 52a and 53a of the clamp jig 51. do.

As a result, welding with a resin tube member or another resin tube joint can always be performed with high precision, and a high quality pipeline can be formed. Moreover, here, since the alignment work of the resin pipe joint 1 when held by the clamp jig 51 becomes unnecessary, the working time can be shortened and the number of steps can be reduced.

In addition, as shown in Figs. 1 and 2, the positioning portion 5 of the resin pipe joint 1 is formed into a convex shape that rises from the outer circumferential surface of the joint body portion 3, and the clamp jig 51 ), the positioning coupling portion 54 is in a concave shape from the opposing surfaces 52a and 53a, but on the contrary, although not shown, a concave positioning portion is provided in the resin pipe joint, and the clamp jig It is also possible to provide a protruding positioning coupling part. However, from the viewpoint of securing the required thickness over the whole by a thin resin pipe joint, as in the embodiment shown in Figs. 1 and 2, a convex positioning portion 5 is provided in the resin pipe joint 1, and a clamp It is suitable to provide a recessed positioning coupling portion 54 on the jig 51.

Here, even when the positioning coupling part of the clamp jig is provided only on one of the surfaces facing the insertion and holding part, and the positioning part of the resin pipe joint is provided only on either the front side or the back side of the joint body part, the clamp jig The position of the resin-made pipe joints maintained at can be sufficiently reliably performed.

As in the embodiment shown in Figs. 1 and 2, each of the positioning joints 54 is provided in each of the plate-shaped portions 52 and 53 facing the clamp jig 51, and the resin pipe joint 1 is To provide each of the positioning portions 5 on the front and rear sides of the joint body portion 3, the resin pipe joint 1 is formed by the plate-shaped portions 52 and 53 of the clamp jig 51. It is preferable in that positioning is maintained more reliably.

In addition, here, the positioning part 5 of the resin pipe joint 1, as shown in FIGS. 1 and 2, has a tapered shape that gradually tapers toward the tip side falling from the outer peripheral surface of the joint body part 3 In addition, the positioning coupling portion 54 to which the clamp jig 51 corresponds can be formed into a tapered shape that gradually tapers toward a deeper position from the surfaces 52a and 53a.

According to this, when inserting the joint body portion 3 of the resin pipe joint 1 between the facing surfaces 52a and 53a of the clamp jig 51, the positioning portion to the positioning coupling portion 54 ( In the initial stage of fitting of 5), only the tapered side of the positioning part 5 of the resin pipe joint 1 first comes into contact with the tapered inner surface of the positioning coupling part 54 of the clamp jig 51, The front face of the positioning portion 5 does not contact the bottom surface of the positioning coupling portion 54. At this time, so-called positioning is performed, and the positioning unit 5 is guided by contact with the tapered side surface of the positioning unit 5 and the tapered inner surface of the positioning unit 54, and the positioning unit 5 is ) Is completely fitted, so that the arrangement of the resin pipe joint 1 to the clamp jig 51 is easy and smooth.

In addition, the positioning part 5 of the resin pipe joint 1 passes through the intersection of the central axis CL of the substantially T-shaped inner flow path 2, as in the embodiment shown in FIGS. It is disposed on the vertical line PL orthogonal to the plane including the axis CL, and the contour shape when viewed from the plane can be a circular convex portion forming a circular shape.

In this case, if the positioning coupling portion of the clamp jig is, for example, a circular depression in which the contour shape when viewed from the top is a circular shape, the circular convex portion 5 of the resin pipe joint 1 is the corresponding circular depression. Since the resin pipe joint 1 can be rotated and displaced as indicated by the arrow in Fig. 4 as a point in the state of being inserted into the part, the resin pipe joint 1 can be removed from the clamp jig without removing several It is possible to weld the end of a resin tube member or another resin tube joint to the weld end 4.

In particular, in this embodiment, the positioning engagement portion 54 of the clamp jig 51 simultaneously has the circular depressions provided on each of the opposing surfaces 52a and 53a, as shown in Fig. 2(a). , In the same drawing, it is extended in a direction opposite to the insertion direction of the joint indicated by the arrow, and is opened by the tip edge E of the opposing surfaces 52a and 53a.

Thus, as described above, in the state where the resin pipe joint 1 is inserted and held by the clamp jig 51, as shown by the arrow in Fig. 4, the circular convex portions fitted into the respective positioning coupling portions 54 (5) By rotating and displacing the resin pipe joint (1) around the shaft connecting the circular convex portions (5) on the front side and the back side by rotating and displacing the resin pipe joint (1) into a clamp jig ( 51), it is possible to sequentially perform welding of several welded end portions 4 with end portions such as a resin tube member.

In addition, here, by opening the positioning coupling portion 54 of the clamp jig 51 to the tip edge E of the facing surfaces 52a, 53a, the clamp jig 51 faces the surfaces 52a, 53a. It is possible to easily insert and place the resin pipe joint 1 in the silo.

In addition, the protrusion height H of the convex positioning portions 5a and 5b of the resin pipe joint 1 is measured on a vertical line PL, and relative to the thickness of the joint body 3, for example, 30 It can be in the range of% to 70%, and specifically, this protrusion height (H) can be made into 1.0 mm-2.0 mm, for example.

In the embodiment shown in FIGS. 1 to 4, a circular convex portion 5 in a circular shape protruding from the outer peripheral surface of the joint body portion 3 is provided in the resin pipe joint 1. However, instead of this, although not shown, a circular concave portion recessed from the outer circumferential surface of the joint body portion may be provided for a resin pipe joint, and a circular protrusion portion of a circular shape protruding from the opposite surface may be provided in the clamp jig. have.

By the way, in the present invention, the positioning portion of the resin pipe joint and the positioning coupling portion of the clamp jig can be formed into various planar contour shapes, such as an elliptical shape, a square shape, or other polygonal shape in addition to the above-described shape. In particular, when the planar contour shape is a square positioning portion and a positioning coupling portion, rotational displacement of a resin pipe joint every 90 degrees becomes possible.

5 shows another embodiment of the resin pipe joint of the present invention.

In the other embodiment shown in Fig. 5, each of the front and back sides of the outer circumferential surface of the joint body portion 23 of the resin pipe joint 21, as a positioning portion, in a form raised from the outer circumferential surface. , Strip-shaped convex portions 26 and 27 extending in a linear shape are provided on the outer circumferential surface, and further protruding higher than these strip-shaped convex portions 26 and 27 on the strip-shaped convex portions 26, 27. A circular convex portion 25 is provided.

More specifically, in the embodiment of FIG. 5, when viewed in plan view, it coincides with the extending direction of the central axis CL of the inner flow path 22 of the joint main body 23, and the two band-shaped convex portions 26, 27) is provided in a substantially T-shape, and circular convex portions 25 are arranged on the intersection of these strip-shaped convex portions 26 and 27.

And, as shown in Fig. 6, the clamp jig 71 for inserting and holding the resin pipe joint 21 of this embodiment is a strip-shaped depression extending along the insertion direction of the joint on the opposite surfaces 72a and 73a. Each of the portion 75 and the band-shaped depression portion 76 extending orthogonally while intersecting with the band-shaped depression portion 75 is provided in an approximately cross shape, and the band-shaped depression portion 75, 76 on these intersections It is provided with a circular depression 74 that is deeper than that. In this clamp jig 71, a strip-shaped recessed portion and a circular recessed portion of the same shape as those provided on the surface 73a of the plate-shaped portion 73 positioned at the bottom of FIG. It is also provided on the surface 72a of the pattern part 72.

In this embodiment shown in Figs. 5 and 6, when the joint body portion 23 of the resin pipe joint 21 is inserted between the surfaces 72a and 73a facing the clamp jig 71, the band-shaped convex portion By fitting the (26, 27) and the band-shaped depressions (75, 76), the resin pipe joint (21) can be positioned and held more reliably, and the band-shaped convex portions (26, 27) and By isolating the opposing surfaces 72a and 73a from each other so that the fitting with the band-shaped depressions 75 and 76 is eliminated, the circular convex portion 25 and the circular depression 74 that are still fitted are taken as points. , The resin pipe joint 21 can be rotated and displaced.

In the embodiment shown in Figs. 5 and 6, the side surfaces of the strip-shaped convex portions 26 and 27 and the inner surface of the strip-shaped recessed portions 75 and 76 are also formed in a tapered shape to enable the above-described positioning. .

In addition, although not shown, it is also possible to use the belt-shaped convex portions 26 and 27 of the resin pipe joint 21 as a belt-shaped concave portion, and the circular convex portion 25 as a circular concave portion, and a clamp jig ( It is also possible to use the strip-shaped recessed portions 75 and 76 of 71) as strip-shaped protrusions and the circular recessed portion 74 as a circular protruding portion. In addition, although not shown in the same way, various kinds of concave portions are provided on the intersection of the strip-shaped convex portions where the resin pipe joints cross each other, and the circular convex portion is provided on the intersection of the strip-shaped concave portions where the resin pipe joints cross each other. Combinations are also possible.

7 shows still another embodiment of the present invention.

In the present invention, in addition to providing the positioning coupling portion on the surface facing the clamp jig, it can be formed in a shape imitating the shape of the outer circumferential surface of the insertion joint body portion as illustrated in FIG. 7.

In the bar shown in Fig. 7, the shape of the outer circumferential surface of the substantially T-shaped joint body portion 33 of the resin pipe joint 31 to be inserted into each of the surfaces 82a and 83a facing the clamp jig 81 is imitated. Thus, a vertical groove 85 extending along the insertion direction of the joint and a horizontal groove 86 extending orthogonally to the vertical groove 85 are provided, and the groove wall surface of the vertical groove 85 and the horizontal groove 86 Is a curved shape that fits the shape of the outer circumferential surface of the joint body portion 33.

For butt-welding the welded ends of the resin pipe joints as described above, it can be used as the welder 101 schematically illustrated in FIG. 8.

The welding machine 101 shown in FIG. 8 includes a pair of clamp jigs 81a and 81b, a reciprocating driving means 102 for relatively displacing the clamp jigs 81a and 81b in the left-right direction of the drawing, and a clamp jig 81a. , 81b) and a heating device 103 for heating the end portion of the resin-made tube joint or the resin-made tube member.

In this welding machine 101, as shown in a partially enlarged view of one clamp jig 81b in FIG. 9, the clamp jig 81b has a pair of plate-shaped portions 82 and 83 as the insertion holding portions thereof, respectively. It is attached and fixed to each of the two half-ring portions 104a and 104b constituting the opening and closing means 104.

Here, although it is not clear from the same drawing, the half-ring portions 104a and 104b of the annular opening and closing means 104 are shown in Fig. In accordance with the opening/closing operation displaced in the direction indicated by the arrow at 9, the respective surfaces 82a and 83a of the plate-like portions 82 and 83 mounted respectively can be separated and displaced from each other. Thereby, a resin pipe joint or the like can be arranged between the surfaces 82a and 83a of the clamp jigs 81a and 81b or can be taken out from therebetween. In this welding machine 101 shown in FIG. 8, the other clamp jig 81a also has the same structure as the one clamp jig 81b.

Alternatively, although not shown, a driving means for directly separating and approaching a pair of plate-shaped portions of a clamp jig, or a bias having an elastic member that applies force in a direction approaching the pair of plate-shaped portions to each other. It is also possible to isolate and displace the surface facing the clamp jig by means of other mechanisms such as means.

It is also possible to fix the surface facing the clamp jig without being isolated or approached. This is because, depending on the material, thickness, and shape of the resin pipe joint, the clamp jig can be inserted between the fixed surfaces while the resin pipe joint is elastically deformed and reduced.

In addition, the clamp jig (81a, 81b) of the welder 101 is preferably provided with a connection fixing portion, for example, by screw fixing or a magnet, so that attachment and detachment and adjustment of the mounting position with respect to the welder 101 is possible. Do. This is because it is possible to replace the clamp jig with another clamp jig or remove the clamp jig according to the shape of the positioning portion of the resin pipe joint to be welded.

In the welding machine 101 shown in Fig. 10, one of the pair of clamp jigs 81a and 81b is removed, and one of the clamp jigs 81b is used as the above-described annular opening and closing means 104, and this annular opening and closing By means of the means 104, a part of the longitudinal direction of the outer peripheral surface of the resin tube member 41 can be surrounded and maintained over the entire circumference.

The resin-made pipe joint and clamp jig described above is particularly suitable to be applied to the so-called short joint welding, where the length (L) of the straight portion of the joint body portion is extremely short, such as 2.0 mm to 6.0 mm. This short joint is due to the fact that the straight portion is short, and it is because there are cases that it cannot be maintained with a jig such as the annular opening and closing means 104 which surrounds and holds the outer circumferential surface over the entire circumference. These short joints are in great demand in recent years when a pipe is required to be compact.

In addition, in the above description, an approximate T-shaped resin pipe joint in which the internal flow path diverges into two branches in the middle is described as an example, but the present invention has a straight or curved shape in which the internal flow path does not branch, but the internal flow path has three or more branches. It can be effectively applied to resin pipe joints of various shapes, such as a shape that diverges into and the inside and outside diameter changes in the middle.

1, 11, 21, 31, 31a, 31b: resin pipe joints
2, 12, 22, 32: inner flow path
3, 13, 23, 33: joint body part
4, 14, 24, 34: end (welded end)
5, 25, 35: circular convex portion (positioning portion)
26, 27: band-shaped convex portion (positioning portion)
41: resin tube member
51, 61, 71, 81, 81a, 81b: clamp jig
52, 53, 72, 73, 82, 83: plate-shaped part (insertion holding part)
52a, 53a, 72a, 73a, 82a, 83a: opposing surfaces
54: positioning coupling portion
74, 84: circular depression (positioning joint)
75, 76: band-shaped recessed portion (positioning coupling portion)
85: vertical groove
86: horizontal groove
101: welder
102: reciprocating drive means
103: heating device
104: annular opening and closing means
104a, 104b: half ring part
CL: Central axis of the inner flow path
PL: A vertical line perpendicular to the central axis past the intersection of the central axis

Claims (13)

A joint body portion having an internal flow path through which fluid flows, and a welded end portion formed in the opening portion of the joint body portion and welded against the end of a resin tube member for piping or another resin pipe joint. And, in welding with the resin tube member or the other resin pipe joint, as a resin pipe joint, the joint body portion is inserted and held between the surfaces facing the insertion and holding portions of the clamp jig,
On the outer circumferential surface of the joint body portion, at a position deviating from the central axis of the inner flow path of the joint body portion, a positioning portion fitted to each of the positioning coupling portions provided on each surface opposite the insertion holding portion is provided, and these positions The crystal part is disposed in each of the outer circumferential surface regions located opposite to each other with the central axis of the inner flow path of the joint body part therebetween,
At least one of the positioning portions is one or more strip-shaped convex portions or strip-shaped concave portions whose planar contour shape extends on the outer circumferential surface of the joint body portion, and at least one of the positioning portions is a planar contour. A resin pipe joint comprising a circular convex portion or a circular concave portion having a circular shape, and the circular convex portion or the circular concave portion is disposed on the strip-shaped convex portion or the strip-shaped concave portion. The method of claim 1,
Resin consisting of the circular convex portion or the circular concave portion of the positioning portion being fitted to each surface facing the insertion holding portion, and configured to enable rotational displacement of the corresponding resin pipe joint as a point of these positioning portions My pipe joint. The method according to claim 1 or 2,
A resin pipe joint that is inserted and held between the insertion holding portion of the clamp jig and held between opposite flat surfaces, wherein the positioning portion is fitted to a positioning coupling portion provided on each of the flat surfaces facing the insertion holding portion. My pipe joint. The method according to claim 1 or 2,
A resin pipe joint configured by disposing the positioning portion on both sides of an outer circumferential surface of the joint body portion in a direction perpendicular to the central axis past the intersection of the central axes of the inner flow paths intersecting each other. The method according to claim 1 or 2,
A pipe joint made of resin, wherein at least one of the positioning portions is formed as a circular convex portion or a circular concave portion having a circular shape in a planar contour shape. In the case of welding the resin pipe joint and the resin pipe member or other resin pipe joint by abutting and welding each end of the resin pipe joint and the resin pipe member or other resin pipe joint, the insertion holding portion having a surface facing each other is provided. As a clamp jig that inserts and holds the joint body portion of the resin pipe joint,
One or more positioning couplings fitted to a positioning portion provided on the outer circumferential surface of the joint body portion on at least one of the surfaces of each of the insertion and holding portions, which contact the joint body portion of the resin pipe joint to be inserted and held To provide wealth,
At least one of the positioning coupling portions is one or more band-shaped depressions or band-shaped protrusions having a planar contour shape extending onto the surface of the insertion holding portion, and at least one of the positioning coupling portions is a plane contour The circular recessed portion or the circular protruding portion is disposed on the strip-shaped recessed portion or the strip-shaped protruding portion, and
In a state in which the circular recessed portion or the circular protruding portion of the positioning coupling portion is fitted to the positioning portion of the resin pipe joint, it is configured to enable rotational displacement of the resin pipe joint using the positioning portion as a point. , Clamp jig. The method of claim 6,
A clamp jig configured by providing a positioning engagement portion fitted to each of two or more positioning portions provided on an outer circumferential surface of a joint body portion of a resin pipe joint on each of the surfaces facing the insertion holding portion. The method according to claim 6 or 7,
The clamp jig, wherein the surface of the insertion holding portion is flat, and the positioning portion is provided on the flat surface. The method according to claim 6 or 7,
A clamp jig comprising at least one of the positioning coupling portions as a circular recessed portion or a circular protruding portion in which a planar contour shape forms a circular shape. The method according to claim 6 or 7,
The positioning coupling part is composed of two or more band-shaped depressions or band-shaped protrusions extending on the surface of the insertion holding part and intersecting each other, and at the same time, the circular shape on the intersection of these band-shaped depressions or band-shaped projections. A clamp jig constructed by placing a recessed portion or a circular projection. The method according to claim 6 or 7,
A clamp jig further comprising a connection fixing portion for attaching and detaching the clamp jig to a welding machine for butt-welding each end portion of a resin pipe joint and a resin tube member. delete delete

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