KR20170072909A - Pipe joint consisting of resin, and clamp jig - Google Patents

Abstract

The resin pipe joint (1) of the present invention has a joint body portion (3) having an internal flow passage (2) for flowing fluid and a welded end portion (4) formed in the opening portion of the joint body portion (Not shown) of the clamp jig 51 on the outer circumferential surface of the joint main body 3 at a position deviated from the central axis CL of the internal flow path 2 of the joint main body 3 52 and 53 are provided with at least one positioning portion 5 fitted in a positioning engagement portion 54 provided on at least one of the surfaces 53a and 52a facing each other.

Description

PIPE JOINT CONSTITUTION OF RESIN, AND CLAMP JIG

The present invention relates to a resin pipe joint having an internal flow path, a resin pipe joint having a welding end portion formed at an opening portion of the joint body portion, and a resin pipe joint and resin tube member, The present invention relates to a clamp jig for holding a resin pipe joint and, more particularly, to a clamp jig for holding a resin pipe joint held by a clamp jig at the time of butt welding of an end portion, Technology.

The piping such as the chemical solution transporting line used in various industries can be manufactured by welding a resin pipe joint composed of a thermoplastic resin or the like and a resin pipe member or other resin pipe joint with each other by welding them together .

More specifically, for example, in the respective clamp jigs in which the welding machines are paired, the end portions of the resin pipe joints and the end portions of the resin tube members are opposed to each other, Tube member, and the like, respectively.

Subsequently, both ends of the resin pipe joint held by the clamp jig and the resin tube member are heated by a heater or other heating device to melt these ends, and in this state, the resin pipe joint and the resin tube member Etc. are brought close to each other, and these end portions are welded together by necessary pressure action.

As a technology focused on such butt welding at the end of the joint, Patent Document 1 discloses a technique in which a plurality of welded annular portions communicating with a flow path in a joint base portion are provided in a joint base portion, and at least one welded loop A butt joint of the resin is provided on the same axis of the shape portion and at the outer end of the joint base portion. According to this " resin butt joint, " it is possible to fix it by using a clamp of a conventional welding machine without using a fixing jig and by tightening it with the appropriate inter-core dimension on the same shaft, It is possible to reliably and easily weld the joints of various thermoplastic resins and the like having welded ring portions and particularly to enable the shortest welding between the joints to be able to cope with downsizing of the apparatus itself and to reduce the size of the piping space, Quot; can be remarkably contributed to anger. &Quot;

Patent Document 1: JP-A-2013-103363

However, in the case of inserting and holding resin pipe joints or the like of a smooth outer circumferential surface between opposite flat surfaces of the clamp jig of the welder while both end portions of the resin pipe joint and the like are welded together, It is necessary to align the central axes of the inner flow paths with each other with high accuracy at the respective end positions of the resin tube joint and the resin tube member to be welded to each other.

That is, when these end portions are welded while the central axes of the internal flow paths at the respective end portions are not coincident with each other, a large step is formed on the inner surface of the boundary pipe between the resin pipe joint connected by welding and the resin tube member. As a result of this, in particular, in addition to the smooth flow of the liquid being impeded, liquid gush occurs therein, and adversely affects the quality of the pipeline, such as the retention of particles that can be contained in the liquid.

In this case, however, there is a problem in that, when inserting resin pipe joints or the like between the opposed surfaces of the clamp jig, the positioning operation for aligning the central axes of the internal flow paths increases the number of steps and the working time.

On the other hand, if such alignment of the center shaft is not ensured, the quality of the pipeline deteriorates as described above.

Further, in Patent Document 1, in the case of a so-called elbow-type joint where the inner flow path is curved at about 90 degrees on the way, at the outer circumferential surface outside the curved portion of the joint, However, in this patent document 1, since only the fixing portion provided on the extended line of the central axis is held by the clamp jig, the weight of the joint itself or the clamping jig There is a fear that the joint caught by the clamp jig at the fixing portion due to its center position may deviate from the expected position.

Therefore, according to the proposed technique of Patent Document 1, it is not possible to form a pipeline of high quality.

It is an object of the present invention to solve such a problem of the prior art, and it is an object of the present invention to position the resin pipe joint held by the clamp jig reliably with high precision, And to provide a resin pipe joint and a clamp jig capable of contributing to improvement in the quality of the pipeline and improvement in workability at the time of butt welding at the end portion.

The resin pipe joint of the present invention is provided with a joint main body portion having an internal flow path for flowing a fluid and a resin pipe joint portion formed at an opening portion of the joint main body portion and abutting the end portion of the resin tube member for piping or the end portion of another resin pipe joint Wherein the joint main body portion is inserted and held between opposing surfaces of the insert holding portion of the clamp jig in the welding of the resin tube member or the resin pipe joint with the resin jig, Wherein at least one positioning portion is provided on an outer circumferential surface of the joint body portion at a position deviating from a central axis of an internal flow path of the joint body portion and fitted to a positioning joint portion provided on at least one of the surfaces facing the insertion / .

Here, the " position deviating from the central axis of the inner flow path on the outer circumferential surface of the joint body portion " means the position of the outer circumferential surface other than the central axis of the inner flow path and its extension line. Therefore, 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 intersects the central axis or the extension line thereof.

Here, in the resin pipe joint of the present invention, the positioning portion, which is fitted to each of the positioning engagement portions provided on each surface of the insertion holding portion facing the outer peripheral surface of the joint body, is provided, It is preferable to arrange each of the outer circumferential surface regions located opposite to each other with the central axis of the inner flow path of the coupling body portion therebetween.

In the resin pipe joint of the present invention, it is preferable that the joint main body portion has an internal flow passage branching in two on the way, passing through the intersection of the central axes of the respective internal flow passages, It is preferable that the positioning portion is disposed on both surfaces of the outer peripheral surface.

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

In the resin pipe joint described above, at least one of the positioning portions may be formed as one or more band-shaped convex portions or band-shaped concave portions whose planar contour shape extends on the outer peripheral surface of the joint body portion, It is preferable that the circular convex portion or the circular concave portion is disposed on the band-like convex portion or the band-like concave portion by using at least one of the circular convex portions or the circular concave portions having a circular planar contour shape.

The clamp jig of the present invention has an insert holding portion having a surface opposed to each other with an interval therebetween. In welding the respective end portions of the resin tube joint and the resin tube joint or other resin joints, Wherein the joint holding portion of the resin pipe joint is inserted and held between the surfaces of the insertion and holding portions that face each other so that at least one of the surfaces contacting the joint body portion of the resin pipe joint to be inserted and held, And at least one positioning and engaging portion that is fitted to a positioning portion provided on an outer circumferential surface of the main body of the coupling is provided.

In the clamp jig of the present invention, it is preferable that a positioning engagement portion is provided on each of the opposing surfaces of the insert-holding portion so as to fit into each of the two or more positioning portions provided on the outer circumferential surface of the joint body portion of the resin pipe joint.

In the above-described clamp jig, it is preferable that at least one of the positioning engagement portions is a circular depressed portion or a circular projection portion having a planar contour shape in a circular shape.

In the above-described clamp jig, at least one of the positioning engagement portions may be formed as one or more band-like depressed portions or band-shaped protruding portions whose planar contour shape extends on the surface of the insertion holding portion, It is preferable that at least one of the recesses is a circular recessed portion or a circular protruding portion having a circular planar contour shape and that the circular recessed portion or the circular protruding portion is disposed on the banded recessed portion or the banded projection.

In this case, the positioning and coupling portion may be formed of two or more band-like depressed portions or band-shaped protruding portions extending on the surface of the insert-holding portion and intersecting with each other, and the band-shaped depressed portions or the band- It is preferable to dispose the circular depression portion or the circular projection portion on the intersection.

In the clamp jig of the present invention, it is preferable to further include a connection fixture for detachably attaching the clamp jig to the welder for welding the respective end portions of the resin tube joint and the resin tube member to each other by welding Do.

According to the present invention, on the outer circumferential surface of the joint main body portion of the resin pipe joint, at a position deviating from the central axis of the internal flow path of the joint body portion, at a positioning engagement portion provided on at least one surface of the opposing surface of the insert- Since the positioning portion provided in the joint body portion is held in the positioning engagement portion provided in the insertion holding portion of the clamp jig when the clamp jig is held by the at least one positioning portion to be fitted, The clamp jig is maintained.

Therefore, since the positioning of the resin pipe joint held by the clamp jig is reliably performed with high accuracy, the quality of the pipe made up of the resin pipe joint welded at each end and the resin tube member is effectively improved And the positioning operation of the resin pipe joint held by the clamp jig becomes unnecessary, thereby reducing the number of processes and shortening the working time.

1 is a perspective view, a plan view and a side view showing one embodiment of a resin pipe joint of the present invention.
Fig. 2 is a perspective view showing the state before and after holding the resin pipe joint of Fig. 1 by the clamp jig, respectively.
Fig. 3 is a side view of the resin tube joint and clamp jig of Fig. 2 together with another resin tube joint and clamp jig for making the butt end of the tube joint and the clamp jig.
Fig. 4 is a perspective view showing a state in which the direction of the pipe joint of Fig. 2 is rotated by 90 degrees. Fig.
5 is a plan view and a side view showing another embodiment of the 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.
Fig. 7 is a perspective view showing another embodiment of the resin pipe joint of the present invention together with a clamp jig for holding it. Fig.
8 is a schematic perspective view showing an example of a welder having the clamp jig of the present invention.
9 is a partially enlarged perspective view showing a clamp jig of the welder of FIG.
Fig. 10 is a perspective view showing the welder of Fig. 8 in a state in which a clamp jig on one side is removed.

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

The resin pipe joint 1 according to one embodiment of the present invention is for constituting a part of a pipe for flowing a liquid such as a chemical liquid or a gaseous or other fluid. As shown in Fig. 1, A hollow main body portion 3 having an internal flow path 2 for flowing the main body portion 3 and a joint main body portion 3 which are formed in each of three opening portions in the figure, And a welding end portion 4 which is made smaller.

As a material constituting the resin pipe joint 1, for example, a perfluoroalkoxyalkane (PFA), a perfluoroethylene propene polymer (FEP) or a polyetherketone (PEEK) can be cited , But it is also possible to use materials other than the materials shown here.

Here, in the embodiment of Fig. 1, the joint main body portion 3 forms a slightly short circular tubular portion extending perpendicularly to the extending direction of the circular tubular portion extending in one direction in the central region in the extending direction of the circular tubular portion As a whole, as shown in Fig. 1 (b), a substantially T-shaped outer shape is obtained when viewed in plan.

Therefore, the joint main body 3 has an approximately T-shaped inner flow path 2 branched in two on its way.

Here, in the present invention, in the outer circumferential surface of the joint main body 3, at a position on the outer circumferential surface deviating from the central axis CL indicated by the broken line in Fig. 1 of the inner flow path 2, At least one convex-shaped positioning portion 5 is provided.

In this embodiment, as shown in Fig. 1 (c), the front surface side and the back surface side located opposite to each other with the central axis CL of the inner flow path 2 interposed therebetween A determination section 5 is provided. In the figure, reference symbol PL designates a vertical line passing through the intersection of the central axis CL of the inner flow path 2 intersecting with each other in a T shape when viewed in a plane and perpendicular to the plane including the corresponding central axis CL .

On the other hand, when the welding end portion 4 of the resin pipe joint 1 is welded to the end portion of the resin tube member or other resin pipe joint, the clamp jig 51 holding the resin pipe joint 1 As shown in Fig. 2 (a), the surfaces 52a, 53a of the plate-like portions 52, 53, which have substantially planar shapes and serve as the insertion holding portions, And each of the opposed flat surfaces 52a and 53a has a shape corresponding to the positioning portion 5 provided on the outer circumferential surface of the joint body portion 3 of the resin pipe joint 1, A positioning and combining portion 54 is provided. Although not clearly shown in Fig. 2, the positioning joining portion 54 in this embodiment includes not only the surface 53a of the plate-like portion 53 located below the clamp jig 51 in Fig. 2, And also on the surface 52a of the plate-like portion 52 located at the uppermost position of the clamp jig 51 in the same manner.

2 (a) and 2 (b), in order to hold the resin pipe joint 1 with the clamp jig 51, the surface side and the back side of the joint body 3 And the position determining portions 5 of the clamp jig 51 are positioned toward the respective positioning engagement portions 54 of the clamp jig 51 and the resin pipe joint 1 is fixed to the surfaces 52a, 53a.

At this time, since the positioning portions 5 of the resin pipe joint 1 are fitted to the respective positioning engagement portions 54 of the clamp jig 51, the resin pipe joint 1 is fixed to the clamp jig 51, And between the surfaces 52a and 53a of the base plate 52a. The resin pipe joint 1 is formed so that the joint body portion 3 is formed on the surfaces 52a and 53a opposed to the clamp jig 51 on both sides of the central axis CL of the internal flow path 2, And is reliably held without positional deviation.

3, another resin pipe joint 11 is attached to the pair of clamp jigs 61. In this case, as shown in Fig. 3, And the end portions 4 and 14 of these resin pipe joints 1 and 11 are positioned so as to face each other.

Thereafter, the both end portions 4 and 14 are heated and melted by a heating device such as a heater. In this state, the clamp jigs 51 and 61 are relatively displaced in the horizontal direction so as to approach each other, The parts 4, 14 are butted against each other by cold curing.

In the butt welding of the end portions 4 and 14 of the resin pipe joints 1 and 11 in the present invention, the clamp jig 51 is provided with resin pipe joints 1 and 2 between the opposed surfaces 52a and 53a The positioning jig 5 is provided on the joint main body 3 of the resin pipe joint 1 and the clamp jig 51 The positioning joint 54 corresponding to the opposing surfaces 52a and 53a is provided so that the resin pipe joint 1 between the opposed surfaces 52a and 53a of the clamp jig 51 is accurately positioned do.

As a result, it is possible to always carry out the welding with resin tube members or other resin pipe joints with high precision, and to form pipes of high quality. Furthermore, since the positioning operation of the resin pipe joint 1 when held by the clamp jig 51 becomes unnecessary here, the working time can be shortened and the number of steps can be reduced.

1 and 2, the positioning portion 5 of the resin pipe joint 1 is formed into a convex shape protruding from the outer peripheral surface of the joint body portion 3, and the clamp jig 51 The recessed positioning portion is provided on the resin pipe joint, although not shown, to the contrary, the recessed positioning portion is provided on the clamp jig It is also possible to provide a projection-type positioning / combining portion. However, from the viewpoint of ensuring the required thickness throughout the entire length of the joint by the thin resin pipe, the convex positioning portion 5 is provided in the resin pipe joint 1 as in the embodiment shown in Figs. 1 and 2, It is preferable that the jig 51 is provided with the recessed positioning and combining portion 54. [

In this case, even if the positioning engagement portion of the clamp jig is provided only on one of the opposite surfaces of the insertion holding portion and the positioning portion of the resin pipe joint is provided only on one of the front surface side and the back surface side of the joint body portion, The positioning of the resin pipe joint held by the pipe can be sufficiently reliably performed.

The positioning jigs 54 are provided on each of the plate-like portions 52 and 53 opposed to the clamp jig 51 as in the embodiment shown in Figs. 1 and 2, The positioning portions 5 are provided on the front side and the back side of the joint body portion 3 so that the joints 1 made of resin are formed by the both plate portions 52 and 53 of the clamp jig 51 So that the positioning can be maintained more reliably.

Here, as shown in Figs. 1 and 2, the positioning portion 5 of the resin pipe joint 1 has a tapered shape gradually tapering toward the tip end side away from the outer peripheral surface of the joint body portion 3 And the positioning engagement portion 54 corresponding to the clamp jig 51 can be tapered gradually tapered toward the deep position from the surfaces 52a and 53a.

According to this configuration, when the joint body portion 3 of the resin pipe joint 1 is inserted between the surfaces 52a, 53a of the clamp jig 51 opposed to each other, the positioning portion Only the tapered side surface of the positioning portion 5 of the resin pipe joint 1 is first brought into contact with the tapered inner surface of the positioning engagement portion 54 of the clamp jig 51, The top surface of the positioning portion 5 does not contact the bottom surface of the positioning engagement portion 54. [ At this time, the so-called positioning is performed and the positioning portion 5 is guided by the positioning engagement portion 54 (see FIG. 5) under the guidance by the contact between the tapered side surface of the positioning portion 5 and the tapered inner surface of the positioning engagement portion 54 So that the arrangement of the resin pipe joint 1 in the clamp jig 51 is easy and smooth.

1 and 2, the positioning portion 5 of the resin pipe joint 1 passes the intersection of the central axis CL of the substantially T-shaped inner flow path 2, Can be arranged on a vertical line PL orthogonal to the plane including the axis CL, and can be formed into a circular convex portion having a circular shape in contour when viewed from the plane.

In this case, when the positioning engagement portion of the clamp jig is, for example, a circular depressed portion having a circular contour when viewed in plan view, the circular protruding portion 5 of the resin pipe joint 1 has a circular depression It is possible to rotationally displace the resin pipe joint 1 as indicated by the arrow in FIG. 4 with the resin pipe joint 1 inserted in the portion of the resin pipe joint 1 without removing the resin pipe joint 1 from the clamp jig. It is possible to weld the end portion of the resin tube member or another resin pipe joint to the welding end portion 4.

Particularly, in this embodiment, as shown in Fig. 2A, the positioning engagement portion 54 of the clamp jig 51 is provided with the circular depressed portions provided on the opposed surfaces 52a and 53a at the same time 53a extending in the direction opposite to the direction of insertion of the joints indicated by arrows in the same drawing and opened at the front edge E of the opposing surfaces 52a, 53a.

4, in the state where the resin pipe joint 1 is inserted and held by the clamp jig 51 as described above, the circular convex portions 1, which are fitted to the respective positioning joint portions 54, The resin pipe joint 1 is rotationally displaced about the axis connecting the circular protrusions 5 on the front surface side and the rear surface side to the clamp jig 1 It is possible to sequentially perform the welding of the plurality of welding end portions 4 to the end portion of the resin tube member or the like without detaching the welding end portions 4 and 51 from the welding end portions 4. [

The clamp jig 51 is provided with the opposed surfaces 52a and 53a by opening the positioning engagement portion 54 of the clamp jig 51 in the front edge E of the opposed surfaces 52a and 53a. It is possible to easily insert and arrange the resin pipe joint 1 between the first and second pipes.

The protruding height H of the convex positioning portions 5a and 5b of the resin pipe joint 1 is measured on the vertical line PL so as to be, for example, 30 % To 70%. Specifically, the projecting height H may be, for example, 1.0 mm to 2.0 mm.

In the embodiment shown in Figs. 1 to 4, the resin pipe joint 1 is provided with a circular convex portion 5 which protrudes from the outer peripheral surface of the joint body portion 3. However, although not shown in the drawings, a circular recess can be provided in the resin pipe joint from the outer circumferential surface of the joint body portion, and a circular protruding portion protruding from the surface opposed to the clamp jig can be provided have.

However, in the present invention, the positioning portion of the resin pipe joint and the positioning and coupling portion of the clamp jig may have various flat outline shapes such as elliptical, quadrangular, or other polygonal shape in addition to the above-described shape. Among them, in the case of the positioning portion and the positioning coupling portion in which the outline of the planar shape is a square, the rotational displacement of the resin pipe joint every 90 degrees becomes possible.

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

In another embodiment shown in Fig. 5, on the front surface side and the back surface side of the outer circumferential surface of the joint main body portion 23 of the resin pipe joint 21, as a positioning portion, Like protrusions 26 and 27 that extend linearly on the outer circumferential surface of the belt-like protrusions 26 and 27, And a circular convex portion 25 is provided.

More specifically, in the embodiment of Fig. 5, two band-shaped convex portions 26, 26 are formed so as to coincide with the extending direction of the central axis CL of the inner flow path 22 of the joint body portion 23 in plan view, 27 are provided in a substantially T-shape, and the circular convex portions 25 are arranged on the intersections of these band-shaped convex portions 26, 27.

As shown in Fig. 6, the clamp jig 71 for holding and holding the resin pipe joint 21 according to this embodiment has a band-like recessed portion 73a extending along the inserting direction of the joint in the opposing surfaces 72a and 73a, Each of the band-shaped depressed portions 76 intersecting with the portion 75 and the band-shaped depressed portion 75 and extending orthogonally therefrom is provided in a substantially cruciform shape. Band-shaped depressed portions 75 and 76 are formed on the intersections, The circular depression 74 is provided. In this clamp jig 71, the band-like depressed portion and the circular depressed portion in the form as provided on the surface 73a of the plate-like portion 73 located at the lower side in Fig. And is also provided on the surface 72a of the shape portion 72.

In this embodiment shown in Figs. 5 and 6, when the joint body portion 23 of the pipe joint 21 made of resin is inserted between the opposed surfaces 72a and 73a of the clamp jig 71, It is possible to more reliably position and maintain the resin pipe joint 21 by fitting the ribs 26 and 27 and the band-shaped depressed portions 75 and 76, By inserting the opposing surfaces 72a and 73a apart from each other so that the fitting with the band-shaped depressed portions 75 and 76 is lost, the circular protruding portion 25 and the circular depressed portion 74 still being fitted , The resin pipe joint 21 can be rotationally displaced.

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

Although not shown, it is also possible that the band convex portions 26 and 27 of the resin pipe joint 21 are band-shaped concave portions and the circular convex portions 25 are circular concave portions. In correspondence thereto, the clamp jig 71 may be band-shaped protruding portions and the circular depressed portion 74 may be a circular protruding portion. It is also possible to provide a circular concave portion on the intersection of the band-shaped convex portions where the resin pipe joints intersect with each other, or to provide a circular convex portion on the intersection of the band- Combinations are also possible.

Fig. 7 shows still another embodiment of the present invention.

In the present invention, the positioning jig can be provided on the surface of the clamp jig, and the shape of the outer circumferential surface of the insertion joint main body can be formed as shown in Fig.

7, the outer peripheral surface shape of the substantially T-shaped joint body portion 33 of the resin pipe joint 31 to be inserted is imitated on each of the surfaces 82a, 83a opposed to the clamp jig 81 A longitudinal groove 85 extending along the insertion direction of the joint and a lateral groove 86 extending orthogonally to the longitudinal groove 85 are provided and the groove wall 85 of the longitudinal groove 85 and the lateral groove 86 Is formed into a curved surface shape that fits in the outer peripheral surface shape of the joint body portion (33).

[0064] The welding of the welding end portion of the resin pipe joint as described above can be used as a welder 101 schematically exemplified in Fig.

The welder 101 shown in Fig. 8 includes a pair of clamp jigs 81a and 81b and a reciprocating drive means 102 for relatively displacing the clamp jigs 81a and 81b in the lateral direction of the figure, , 81b), and a heating device (103) for heating the ends of the resin tube joints or resin tube members.

9, the clamp jig 81b has a pair of plate-like portions 82, 83 as its insertion holding portions, which are annularly shaped as shown in a partial enlarged view of the one clamp jig 81b, Ring portions 104a and 104b constituting the opening and closing means 104, respectively.

The half ring portions 104a and 104b of the ring-shaped opening and closing means 104 are connected to each other by a hinge mechanism or the like connecting the half ring portions 104a and 104b to each other, The respective surfaces 82a and 83a of the plate-like portions 82 and 83 mounted thereon can be separated from each other and can be displaced closer to each other in accordance with the opening and closing operation of displacing in a direction indicated by an arrow in FIG. Therefore, a resin pipe joint or the like can be disposed between the surfaces 82a and 83a of the clamp jigs 81a and 81b, or can be taken out therebetween. In the welder 101 shown in Fig. 8, the other clamp jig 81a has the same structure as that of the one clamp jig 81b.

Although not shown in the drawings, a driving means for directly isolating and approaching a pair of plate-shaped portions of the clamp jig, or a biasing means having elastic members for urging the pair of plate- It is possible to isolate and approximate the surface of the clamp jig which is opposed to the clamp jig by other mechanisms.

It is also possible to fix the opposed surface of the clamp jig without isolating or approaching. 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 in a state in which the resin pipe joint is elastically deformed.

The clamp jigs 81a and 81b of the welder 101 are preferably provided with connection fixtures such as screws or magnets so that they can be attached to and detached from the welder 101 and the mounting position can be adjusted Do. This makes it possible to replace the clamp jig with another clamp jig or to remove the clamp jig in accordance with the shape of the positioning portion of the resin pipe joint to be welded.

The welder 101 shown in Fig. 10 has one of the clamp jigs 81b of the pair of clamp jigs 81a and 81b removed and one of them is the annular opening / closing means 104 described above. A portion of the outer circumferential surface of the resin tube member 41 in the longitudinal direction can be surrounded and surrounded by the means 104.

It is particularly preferable that the resin pipe joint and the clamp jig described above are applied to so-called short joint welding in which the length L of the straight portion of the joint body portion is extremely short, for example, about 2.0 mm to 6.0 mm. This short joint is due to the short straight portion, and can not be held in the same jig as the annular opening / closing means 104 that surrounds and surrounds the entire circumference. In recent years, there is a great demand for such a short joint, which may require a compact piping.

In addition, although the foregoing description has been made by taking an example of a substantially T-shaped resin pipe joint in which the inner flow path diverges in the middle in the middle, the present invention is not limited to a straight or curved shape in which the inner flow path does not branch, And the like, and the shape of the resin pipe of various shapes such as the shape in which the inner and outer diameters change on the way can be effectively applied to the sound.

1, 11, 21, 31, 31a, 31b: Resin pipe joint
2, 12, 22, 32: inner flow path
3, 13, 23, 33:
4, 14, 24, 34: end (welding end)
5, 25, 35: circular convex portion (positioning portion)
26, 27: belt-shaped convex portions (positioning portions)
41: Resin tube member
51, 61, 71, 81, 81a, 81b: clamp jig
52, 53, 72, 73, 82, 83: plate-like portion (insert retaining portion)
52a, 53a, 72a, 73a, 82a, 83a:
54:
74, 84: circular depression portion (positioning and coupling portion)
75, 76: Band-shaped recessed portion (positioning and coupling portion)
85: Vertical groove
86: Horizontal groove
101: welder
102:
103: Heating device
104: ring opening / closing means
104a and 104b:
CL: center axis of the inner flow path
PL: a line perpendicular to the central axis passing through the intersection of the central axes

Claims (11)

And a welding end portion formed at an opening portion of the joint body portion and welded to the end portion of the resin tube member for piping or the end portion of another resin pipe joint, And a resin pipe joint in which the joint body portion is inserted and held between the opposing surfaces of the insert holding portion of the clamp jig in the fusion of the resin tube member or the resin pipe joint,
And at least one positioning portion is provided on an outer circumferential surface of the joint body portion at a position deviating from a center axis of an internal flow path of the joint body portion and fitted in a positioning joint portion provided on at least one of the surfaces facing the insert- , Made of resin. The method according to claim 1,
Wherein the positioning portion is provided on an outer circumferential surface of the joint main body portion so as to be fitted to each of the positioning joint portions provided on each of the opposing surfaces of the insertion and holding portion and the positioning portion is interposed between the central axes of the internal flow path of the joint body portion And are arranged in the outer circumferential surface regions located on the opposite sides of each other. 3. The method according to claim 1 or 2,
And the positioning portion is disposed on both surfaces of the outer circumferential surface of the joint main body in a direction perpendicular to the center axis through the intersection of the central axes of the respective internal flow passages, , Made of resin. 4. The method according to any one of claims 1 to 3,
Wherein at least one of the positioning portions is formed as a circular convex portion or a circular concave portion having a circular contour in a planar contour shape. 4. The method according to any one of claims 1 to 3,
Wherein at least one of the positioning portions is formed of at least one band-shaped convex portion or band-like concave portion whose planar contour shape extends on the outer peripheral surface of the joint body portion, And the circular convex portion or the circular concave portion is disposed on the band-like convex portion or the band-like concave portion as a circular convex portion or a circular concave portion whose shape is a circular shape. And an insertion holding portion having a surface opposed to each other with an interval therebetween, wherein, in welding each of the ends of the resin tube joint and the resin tube member or the other resin tube joint by mutually abutting each other, A clamp jig for inserting and holding a joint main body portion of the resin pipe joint,
Wherein at least one of the surfaces of each of the insertion and holding portions which is in contact with the joint main body portion of the resin pipe joint to be inserted and held is provided with at least one positioning and engaging portion that is fitted to a positioning portion provided on an outer circumferential surface of the joint body portion And a clamp jig. The method according to claim 6,
Wherein the positioning jigs are provided on each of the opposing surfaces of the insert retaining portion so as to be fitted to each of the two or more positioning portions provided on the outer circumferential surface of the joint main body portion of the resin pipe joint. 8. The method according to claim 6 or 7,
Wherein at least one of the positioning engagement portions is formed as a circular recessed portion or a circular projection portion having a circular contour in a planar contour shape. 8. The method according to claim 6 or 7,
Wherein at least one of the positioning and coupling portions is formed as one or more band-shaped depressed portions or strip-shaped protruding portions whose planar contour shape extends on the surface of the insertion holding portion, and at least one of the positioning / Wherein the circular recessed portion or the circular protrusion portion is disposed on the band-shaped depressed portion or the band-shaped protrusion portion, the circular recessed portion or the circular protrusion portion being a circular depressed portion or circular protrusion portion having a planar contour shape in a circular shape. 10. The method of claim 9,
Wherein the positioning and coupling portion is constituted by two or more band-shaped depressed portions or band-shaped protruding portions extending on the surface of the insert-holding portion and intersecting with each other, and on the intersections of the band-shaped depressed portions or the band- , And the circular recessed portion or the circular projection portion is disposed. 11. The method according to any one of claims 6 to 10,
Further comprising a connection fixing portion for detachably attaching the clamp jig to a welding machine for welding and welding the respective end portions of the resin tube joint and the resin tube member.

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