JP2022104286A - Jig and fusion method - Google Patents

Abstract

To provide a jig which can suppress the formation of a clearance between an electrical fusion joint and a pipe, and a fusion method.SOLUTION: A jig 200 comprises a first clamp part 210, a second clamp part 220, a shaft part 230 and a pressing part 240. The first clamp part 210 fixes a resin pipe 11. The second clamp part 220 fixes a resin pipe 12 so as to be located on the same axis as that of the resin pipe 11. The shaft part 230 is attached with the first clamp part 210 so as to be movable, and arranged in parallel with the axis of the resin pipe 11 which is fixed to the first clamp part 210. The pressing part 240 presses the first clamp part 210 toward the second clamp part 220 side along the shaft part 230 in a state in which a pipe end 11a of the resin pipe 11 inserted into one joint receptacle part 23 abuts on a stopper part 22, and a pipe end 12a of the resin pipe 12 inserted into the other joint receptacle part 24 abuts on the stopper part 22.SELECTED DRAWING: Figure 6

Description

The present disclosure relates to jigs and fusion methods.

An electric fusion joint is often used when connecting pipe bodies using a resin such as a resin pipe or a metal reinforced composite pipe having a resin layer and a metal reinforcing layer (see, for example, Patent Document 1).

For example, in Patent Document 1, a taper is formed in the pipe insertion portion of the electrically fused joint, and the heat-softened pipe enters the inner surface of the heat-melted joint due to the load applied in the axial direction and is firmly formed. It is fused.

Japanese Unexamined Patent Publication No. 9-280466

However, in Patent Document 1, a gap is generated between the end faces of the pipe, so that the flow of water or chemical solution stays. As a result, microorganisms propagate and cause deterioration of water quality, and deterioration of the chemical solution causes deterioration of purity, which may cause deterioration of product yield in semiconductor manufacturing pipes and the like.

On the other hand, even in the configuration in which the stopper portion is formed on the inner peripheral surface of the joint as described as the prior art in FIG. 4 of Patent Document 1, the stopper portion and the pipe end surface are not fused. Gap may occur.

It is an object of the present disclosure to provide a jig and a fusion method capable of suppressing the generation of a gap between an electrically fusion joint and a pipe.

In order to achieve the above object, the jig according to the first disclosure has a tubular main body having joint receiving portions into which the pipe can be inserted inward at both ends, and the jig so as to project inward to the inner surface of the main body. To connect the first pipe and the second pipe via an electric fusion joint provided with a stopper portion provided in the stopper portion and a heat generating portion including a heating wire coated on an insulator arranged in the stopper portion. The jig used includes a first clamp portion, a second clamp portion, a shaft portion, and a pressing portion. The first clamp portion fixes the first pipe. The second clamp portion fixes the second pipe so as to be located on the same axis as the first pipe. The shaft portion is movably attached to the first clamp portion and is arranged in parallel with the axis of the first pipe fixed to the first clamp portion. In the pressing portion, the pipe end of the first pipe inserted inside one of the joint receiving portions abuts on the stopper portion, and the pipe end of the second pipe inserted inside the other joint receiving portion is the stopper portion. The first clamp portion is pressed along the shaft portion toward the second clamp portion in a state of being in contact with the second clamp portion.
In this way, the heat generating part is arranged in the stopper part, and by energizing the heat generating part in a state where the pipe end of the first pipe and the pipe end of the second pipe are pressed against the stopper part by a jig, the first pipe It can be melted and connected between the pipe end and the stopper portion and between the pipe end and the stopper portion of the second pipe. Therefore, it is possible to suppress the generation of a gap between the electrically fused joint and the first pipe and the second pipe.

In addition, when the electric fusion joint is not used, the pipes are connected by butt fusion, but in butt fusion, the pressing jig is integrated with the heater that heats and melts the end face of the pipe. The tool becomes large. On the other hand, in the present disclosure, since the electric fusion joint is used, it is not necessary to provide a heater in the jig, and the jig can be miniaturized.

The jig according to the second disclosure is the jig according to the first disclosure, and further includes a regulation unit. The regulating portion regulates the movement of the first clamp portion toward the second clamp portion.

Thereby, it is possible to prevent the first clamp portion from moving too much toward the second clamp portion. The first clamp portion is configured to move to the second clamp portion side by the pressing portion, but if it moves too much to the second clamp portion side, the first pipe, the second pipe, and the electric fusion joint are cured. Since it is difficult to place it on the tool, this can be prevented by the regulatory department.

The jig according to the third disclosure is the jig according to the first or second disclosure, and the shaft portion inserts the first clamp portion. The pressing portion is attached to the shaft portion.

As a result, the pressing portion allows the first clamp portion to apply a load to the first pipe, the electrically fused joint, and the second pipe toward the second clamp portion along the shaft portion.

Further, since the first clamp portion moves along the shaft portion, it is possible to suppress the shaft misalignment between the first pipe and the second pipe.

The jig according to the fourth disclosure is the jig according to any one of the first to third disclosures, and the pressing portion has a spring, a motor, or a cylinder.

As a result, a load can be applied to the first pipe, the electric fusion joint and the second pipe.

The jig according to the fifth disclosure is the jig according to any one of the first to third disclosures, and the pressing portion includes a spring and a moving member. The spring is arranged on the shaft portion of the first clamp portion on the opposite side of the second clamp portion. The moving member is arranged on the shaft portion on the side opposite to the first clamp portion of the spring, and moves along the shaft portion to adjust the compression amount of the spring.

As a result, when the moving member is moved to the spring side, the load applied to the first pipe, the electric fusion joint and the second pipe can be increased by the first clamp portion, and the moving member is moved to the side opposite to the spring. If so, the load applied to the first pipe, the electric fusion joint and the second pipe can be reduced by the first clamp portion.

In this way, the load can be adjusted by moving the moving member.

The fusion method according to the sixth disclosure is a tubular main body portion having joint receiving portions into which a pipe can be inserted inward at both ends, and a stopper portion provided so as to project inside the inner surface of the main body portion. , A fusion method in which the first pipe and the second pipe are connected by using a jig via an electric fusion joint including a heating portion including a heating wire coated on an insulator arranged in a stopper portion. It includes a placement step, a heating step, and a pressing step. In the arrangement step, the first pipe is fixed by the first clamp portion of the jig so that the first pipe and the second pipe are inserted into the joint receiving portions at both ends, and the second pipe is fixed by the second clamp portion of the jig. The pipe is fixed so as to be located on the same axis as the first pipe, and an electric fusion joint is placed between the first pipe and the second pipe. In the heating step, after the arrangement step, the heat generating portion is heated to melt and connect the first pipe, the electric fusion joint, and the second pipe. In the pressing step, the first clamp portion is pressed toward the second clamp portion side before, during, or after the heating step.

In this way, the heat generating part is arranged in the stopper part, and by energizing the heat generating part in a state where the pipe end of the first pipe and the pipe end of the second pipe are pressed against the stopper part by a jig, the first pipe It can be melted and connected between the pipe end and the stopper portion and between the pipe end and the stopper portion of the second pipe. Therefore, it is possible to suppress the generation of a gap between the electrically fused joint and the first pipe and the second pipe.

According to the present disclosure, it is possible to provide a jig and a fusion method capable of suppressing the generation of a gap between an electric fusion joint and a pipe.

The external view which shows the electric fusion joint and the resin pipe connected to the electric fusion joint in embodiment which concerns on this disclosure. The cross-sectional block diagram which shows the electric fusion joint of FIG. FIG. 3 is a cross-sectional configuration diagram showing a state in which a resin pipe and a resin pipe are inserted into the electrically fused joint of FIG. The figure for demonstrating the volume ratio of the lead wire and resin in a stopper part. The perspective view which shows the jig used for the fusion method of embodiment which concerns on this disclosure. The figure which shows the state which attached the resin tube, the electric fusion joint, and the resin tube to the jig of FIG. The side view of FIG. The flow chart which shows the fusion method of embodiment which concerns on this disclosure. Sectional drawing which shows electric fusion joint and resin pipe after fusion | fusion. (A)-(d) The figure for demonstrating the volume relationship between the filling part of the stopper part for forming a bead, and the gap. The cross-sectional view which shows the electric fusion joint of the modification of embodiment which concerns on this disclosure.

Hereinafter, embodiments according to the present disclosure will be described with reference to the drawings.

<Structure>
(Overview of piping structure 100)
FIG. 1 is a diagram showing an electric fusion joint 1 according to an embodiment of the present disclosure, a resin pipe 11 (an example of a pipe) connected by the electric fusion joint 1, and a resin pipe 12 (an example of a pipe). be. FIG. 1 can be said to be an exploded view of the piping structure 100. The piping structure 100 includes, for example, an electric fusion joint 1, a resin pipe 11, and a resin pipe 12.

As shown in the figure, the electric fusion joint 1 is fused with the resin pipe 11 and the resin pipe 12, and connects the resin pipe 11 and the resin pipe 12.

The resin tube 11 and the resin tube 12 are each made of a thermoplastic resin such as a polyolefin resin. It may be a single-layer tube or a multi-layer tube. Specific examples include polyethylene.

In the resin pipe 11 and the resin pipe 12, flow paths 11f and 12f having a circular cross section extend inside. A flow path 1f having a circular cross section extends inside the electrically fused joint 1. In a state where the resin pipe 11 and the resin pipe 12 are connected by the electric fusion joint 1, the axes of the respective flow paths of the resin pipe 11, the resin pipe 12, and the electric fusion joint 1 are arranged on the same straight line.

The direction in which each axis extends with respect to the flow paths of the electrically fused joint 1, the resin pipe 11, and the resin pipe 12 is defined as the axis direction A. Further, in the electrically fused joint 1, the resin pipe 11, and the resin pipe 12, the direction in which the electric fusion joint 1, the resin pipe 11, and the resin pipe 12 are orthogonal to each other and are close to each other and separated from each other is defined as the radial direction B, and the direction around each axis is defined as the circumferential direction C.

The resin pipe 11 moves relative to the electric fusion joint 1 in the axial direction A in the direction of the arrow A1 and is connected to the electric fusion joint 1. Further, the resin pipe 12 moves relative to the electric fusion joint 1 in the axial direction A in the direction of the arrow A2 and is connected to the electric fusion joint 1. The state in which the resin pipe 11 and the resin pipe 12 are fused and connected to the electric fusion joint 1 constitutes the piping structure 100.

(Electrical fusion joint 1)
FIG. 2 is a diagram showing a cross-sectional configuration of the electric fusion joint 1.

As shown in FIGS. 1 and 2, the electric fusion joint 1 has a main body portion 2, a heat generating portion 5, and a connector mounting portion 6.

(Main body 2)
The main body portion 2 is made of a thermoplastic resin such as a polyolefin resin, and has a tubular portion 21 and a stopper portion 22 as shown in FIG. The tubular portion 21 is tubular and has a joint receiving portion 23, a joint receiving portion 24, and a continuous portion 25. A resin pipe 11 is inserted inside the joint receiving portion 23. A resin pipe 12 is inserted inside the joint receiving portion 24.

The thermoplastic resin used in the main body 2 is not particularly limited, but a thermoplastic resin having a melting point of less than 230 ° C. is preferable. Specific examples include polyethylene.

FIG. 3 is a cross-sectional configuration diagram showing a state in which the resin pipe 11 is inserted inside the joint receiving portion 23 of the electric fusion joint 1 and the resin pipe 12 is inserted inside the joint receiving portion 24.

The inner diameter of the joint receiving portion 23 is formed to be larger than the outer diameter of the resin pipe 11. Further, the inner diameter of the joint receiving portion 24 is formed to be larger than the outer diameter of the resin pipe 12.

As shown in FIG. 2, the continuous portion 25 is connected to the joint receiving portion 23 and the joint receiving portion 24, and connects the joint receiving portion 23 and the joint receiving portion 24. The continuous portion 25 is a portion that connects between the joint receiving portion 23 and the joint receiving portion 24, and a stopper portion 22, which will be described later, is provided inside the radial direction B.

(Stopper portion 22)
The stopper portion 22 is an annular portion. The stopper portion 22 is formed on the inner surface 21a of the tubular portion 21 in a ridge along the circumferential direction C over the entire circumference. The stopper portion 22 also contains a thermoplastic resin, and is preferably formed of the same resin as the thermoplastic resin used in the tubular portion 21.

The stopper portion 22 is formed so as to project inward in the radial direction from the inner surface 21a of the tubular portion 21. Further, the stopper portion 22 is arranged inside the continuous portion 25 of the tubular portion 21 in the radial direction B. The stopper portion 22 may be formed as one member with the tubular portion 21 or may be formed as a separate member from the tubular portion 21.

As shown in FIG. 2, the stopper portion 22 has a first side surface 22a, a second side surface 22b, and a peripheral surface 22c. The peripheral surface 22c is an end surface on the inner side in the radial direction of the stopper portion 22.

The first side surface 22a is formed substantially perpendicular to the axial direction A from the inner surface 21a of the tubular portion 21 toward the inside of the radial direction B.

The second side surface 22b is formed substantially perpendicular to the axial direction A from the inner surface 21a of the tubular portion 21 toward the inside of the radial direction B.

The peripheral surface 22c connects the radial inner end of the first side surface 22a and the radial inner end of the second side surface 22b. The peripheral surface 22c is formed substantially parallel to the inner surface 21a of the tubular portion 21. In the non-fused state, the peripheral surface 22c is at a height position so as not to protrude from the inner surfaces of the resin pipes 11 and 12.

When the resin pipe 11 is inserted inside the joint receiving portion 23, as shown in FIG. 3, the pipe end 11a of the resin pipe 11 comes into contact with the first side surface 22a of the stopper portion 22, and the insertion position of the pipe end 11a is reached. Is regulated. The tube end 11a comes into contact with the first side surface 22a when the tube end 11a comes into direct contact with the first side surface 22a and when the tube end 11a first comes into contact with the heating wire 51 (described later) of the heat generating portion 5. This includes the case of indirectly contacting the side surface 22a.

When the resin pipe 12 is inserted inside the joint receiving portion 24, the pipe end 12a of the resin pipe 12 comes into contact with the second side surface 22b of the stopper portion 22, and the insertion position of the pipe end 12a is as shown in FIG. Is regulated. The pipe end 12a comes into contact with the second side surface 22b when the pipe end 12a comes into direct contact with the second side surface 22b and when the pipe end 12a comes into contact with the heating wire 51 (described later) of the heat generating portion 5. This includes the case of indirectly contacting the side surface 22b.

(Heating part 5)
The heat generating portion 5 is provided on the stopper portion 22. The heating unit 5 has a heating wire 51. The heating wire 51 is provided on the stopper portion 22 so as to be wound in the circumferential direction C along the axial direction A. In the present embodiment, the heating wire 51 is wound around the stopper portion 22, for example, four times. In the heat generating portion 5 of the present embodiment, the outer surface of the heating wire 51 is insulated, and all the adjacent heating wires 51 are in contact with each other.

The heating wire 51 is embedded in the stopper portion 22, but even if a part of the heating wire 51 is embedded in the stopper portion 22 so as to be exposed from the first side surface 22a, the second side surface 22b or the peripheral surface 22c to the flow path 1f side. good.

The heating wire 51 may have a conducting wire 51a and an insulating film 51b, as shown in FIG. 2, for example. As the conducting wire 51a, for example, a nichrome wire, an iron chromium type 2 wire, an iron chromium type 1 wire, a nickel chromium wire, or the like can be used. The wire diameter of the conductor 51a can be set to φ0.3 to 0.8 mm. If it is less than φ0.3 mm, it may expand due to the tension during winding and the resistance value may become unstable. The wire diameter of the conducting wire 51a is set to a maximum of 0.8 mm in the equipment for forming the insulating film 51b. The resistance value of the unit length of the conducting wire 51a is, for example, 20Ω / m. The resistance value of the unit length of the conducting wire 51a is about 2 to 21Ω / m depending on the wire diameter.

The insulating film 51b is provided so as to cover the periphery of the conducting wire 51a. The insulating film 51b has a melting point of 230 degrees or higher. It is preferable that this is set to a temperature at which the thermoplastic resin does not melt even at a temperature at which the thermoplastic resin melts (for example, in the case of polyethylene, the heating wire is heated to 220 degrees) in the present embodiment. The insulating film 51b can be formed of, for example, a fluorine-based resin or an imide-based resin, but it is more preferable to form the insulating film 51b with a polyimide-based resin. For example, the thickness of the conductor 51a may be set to 0.1 mm or more and 10 mm or less.

Further, the volume ratio of the lead wire 51a and the resin in the stopper portion 22 is set to be 0.04 to 0.07. As shown in FIG. 4, where S is the cross-sectional area of one conducting wire 51a and T is the cross-sectional area of the stopper portion 22 and the insulating film 51b combined, the volume of the conducting wire 51a / the volume of the stopper portion 22 and the insulating film 51b. ≈4 × S / T can be set. This 4S / T is set to be 0.04 to 0.07. FIG. 4 is an enlarged view of part D of FIG.

In the present embodiment, one heating wire 51 is wound around the heat generating portion 5 so as to be in contact with the adjacent one, but the present invention is not limited to this, and the number of turns is 3 or less or 5 or more. There may be. Further, the heat generating portion 5 may be formed by winding not only one but also two or more heating wires 51. The heating wire 51 may be wound so as not to come into contact with the neighbor.

(Connector mounting part 6)
The connector mounting portion 6 has two pins 61 as shown in FIG. The two pins 61 are provided so as to project outward in the radial direction from the outer surface 21d of the tubular portion 21. As shown in FIG. 2, one of the two pins 61 is arranged in the vicinity of the end 21b of the tubular portion 21, and the other pin 61 is arranged in the vicinity of the end 21c. Although not shown, the two pins 61 are connected to the heating wire 51 of the heat generating portion 5. When the connector of the electric fusion device is attached to the pin 61 and energization is performed, the heating wire 51 generates heat.

<Jig 200>
Next, the jig 200 used in the fusion method of the embodiment according to the present disclosure will be described. A resin pipe 11, an electric fusion joint 1 and a resin pipe 12 are arranged on the jig 200. FIG. 5 is a diagram showing a jig 200. FIG. 6 is a diagram showing a state in which the resin pipe 11, the electric fusion joint 1, and the resin pipe 12 are attached to the jig 200. FIG. 7 is a side view of FIG.

The jig 200 includes a first clamp portion 210, a second clamp portion 220, a shaft portion 230, a pressing portion 240, a regulating portion 250, and a pedestal 260.

(Pedestal 260)
The pedestal 260 is a plate-shaped member. The pedestal 260 supports a first clamp portion 210, a second clamp portion 220, a shaft portion 230, a pressing portion 240, and a regulating portion 250 arranged on the upper surface side thereof.

(1st clamp portion 210)
The first clamp portion 210 sandwiches and fixes the resin tube 11. The first clamp portion 210 has a lower clamp portion 211, an upper clamp portion 212, a hinge portion 213, a fastening portion 214, and a bearing portion 215. The lower clamp portion 211 is a member having a semicircular recess 211a formed on the upper surface thereof. In the present embodiment, the lower clamp portion 211 is a member having a substantially rectangular cuboid shape in which a semicircular concave portion is formed on the upper surface.

The bearing portion 215 is provided on the lower clamp portion 211. The bearing portion 215 is inserted into a through hole formed in the lower clamp portion 211. The bearing portion 215 is arranged below the recess 211a. A shaft portion 230, which will be described later, is inserted inside the bearing portion 215. The axial direction of the bearing portion 215 is arranged parallel to the central axis of the recess 211a. As a result, the first clamp portion 210 can move along the shaft portion 230. When the resin pipe 11, the resin pipe 12, and the electric fusion joint 1 are arranged on the jig, the axial direction of the bearing portion 215 is parallel to the axial direction A.

The upper clamp portion 212 is a member in which a semicircular recess 212a is formed. In the present embodiment, the upper clamp portion 212 is a member having a substantially rectangular cuboid shape in which a semicircular concave portion 212a is formed on a predetermined surface.
The upper clamp portion 212 and the lower clamp portion 211 can sandwich the outer periphery of the resin tube 11 between the recesses 212a and the recesses 211a formed therein. The central axes of the recess 212a and the recess 211a substantially coincide with each other when the resin tube 11 is sandwiched. Further, in a state where the resin tube 11 is sandwiched, the central axis coincides with the above-mentioned axial direction A.

The hinge portion 213 rotatably connects the ends of the lower clamp portion 211 and the upper clamp portion 212 to each other. The upper clamp portion 212 is configured to be rotatable with respect to the lower clamp portion 211 about the hinge portion 213. When the upper clamp portion 212 rotates about the hinge portion 213, the recess 212a is attached to the lower clamp portion 211 via the hinge portion 213 so that the recess 212a faces the recess 211a of the lower clamp portion 211. There is.

The resin tube 11 is arranged along the recess 211a of the lower clamp portion 211 with the lower clamp portion 211 and the upper clamp portion 212 open around the hinge portion 213. After that, the upper clamp portion 212 rotates around the hinge portion 213, and the resin tube 11 is arranged so as to fit into the recess 212a.

The fastening portion 214 is a so-called snap lock. The fastening portion 214 has a lock body 214a and a protrusion 214b. The fastening portion 214 is provided on the side opposite to the hinge portion 213 with the recesses 211a and 212a of the lower clamp portion 211 and the upper clamp portion 212 interposed therebetween. The lock body 214a is arranged on the side surface of the lower clamp portion 211, and the protrusion 214b is arranged on the side surface of the upper clamp portion 212. The lock body 214a has a lever 214c and an annular portion 214d. With the upper clamp portion 212 rotated upward of the lower clamp portion 211, by hooking the annular portion 214d on the protrusion 214b and tilting the lever 214c downward, the upper clamp portion 212 with respect to the lower clamp portion 211. Can be fastened in the closed state.

(Second clamp portion 220)
The second clamp portion 220 sandwiches and fixes the resin tube 12. The second clamp portion 220 fixes the resin tube 12 so that the central axis of the resin tube 12 coincides with the central axis of the resin tube 11.

The second clamp portion 220 has a lower clamp portion 221, an upper clamp portion 222, a hinge portion 223, and a fastening portion 224. The lower clamp portion 221 is a member having a semicircular recess 221a formed on the upper surface thereof. In the present embodiment, the lower clamp portion 221 is a member having a substantially rectangular cuboid shape in which a semicircular concave portion is formed on the upper surface. The lower clamp portion 211 is fixed to the pedestal 260 via the bracket 270.

The upper clamp portion 222 is a member in which a semicircular concave portion 222a is formed. In the present embodiment, the upper clamp portion 222 is a member having a substantially rectangular cuboid shape in which a semicircular concave portion 222a is formed on a predetermined surface.
The upper clamp portion 222 and the lower clamp portion 221 can sandwich the outer periphery of the resin tube 12 between the recess 222a and the recess 221a formed therein. The central axes of the recess 222a and the recess 221a substantially coincide with each other when the resin tube 12 is sandwiched. Further, in a state where the resin tube 12 is sandwiched, the central axis coincides with the above-mentioned axial direction A.

The hinge portion 223 rotatably connects the ends of the lower clamp portion 221 and the upper clamp portion 222 to each other. The upper clamp portion 222 is configured to be rotatable with respect to the lower clamp portion 221 with the hinge portion 223 as the center. When the upper clamp portion 222 is rotated around the hinge portion 223, the recess 222a is attached to the lower clamp portion 221 via the hinge portion 223 so that the recess 222a faces the recess 221a of the lower clamp portion 221. There is.

The resin tube 12 is arranged along the recess 221a of the lower clamp portion 221 with the lower clamp portion 221 and the upper clamp portion 222 open around the hinge portion 223. After that, the upper clamp portion 222 rotates around the hinge portion 223, and the resin tube 12 is arranged so as to fit into the recess 222a.

The fastening portion 224 is a so-called snap lock. The fastening portion 224 has a lock body 224a and a protrusion 224b. The fastening portion 224 is provided on the side opposite to the hinge portion 223 with the recesses 221a and 222a of the lower clamp portion 221 and the upper clamp portion 222 interposed therebetween. The lock body 224a is arranged on the side surface of the lower clamp portion 221 and the protrusion 224b is arranged on the side surface of the upper clamp portion 222. The lock body 224a has a lever 224c and an annular portion 224d. With the upper clamp portion 222 rotated upward of the lower clamp portion 221 by hooking the annular portion 224d on the protrusion 224b and tilting the lever 224c downward, the upper clamp portion 222 with respect to the lower clamp portion 221. Can be fastened in the closed state.

With the resin tube 11 and the resin tube 12 inserted in the electric fusion joint 1, the resin tube 11 is sandwiched between the first clamp portions 210 and the resin tube 12 is sandwiched between the second clamp portions 220, whereby the resin is attached to the jig 200. The pipe 11, the resin pipe 12, and the electric fusion joint 1 can be arranged.

(Shaft part 230)
The shaft portion 230 is supported by the pedestal 260. The shaft portion 230 is arranged in parallel with the central axis of the recess 211a and the recess 212a of the first clamp portion 210. The shaft portion 230 is arranged in parallel with the central axis of the recess 221a and the recess 222a of the second clamp portion 220. Further, the shaft portion 230 is arranged in parallel with the central axis of the resin pipe 11 fixed to the first clamp portion 210 and the resin pipe 12 fixed to the second clamp portion 220. The shaft portion 230 is arranged along the above-mentioned axial direction A.

The shaft portion 230 extends from the second clamp portion 220 toward the first clamp portion 210. A first clamp portion 210 is attached to the shaft portion 230 so as to be movable along the shaft portion 230. The shaft portion 230 is arranged from the lower clamp portion 221 to the lower clamp portion 211. The bearing portion 215 is arranged in a portion below the recess 211a of the lower clamp portion 211 of the first clamp portion 210, and the shaft portion 230 is inserted through the bearing portion 215.

(Pressing part 240)
The pressing portion 240 presses the first clamp portion 210 toward the second clamp portion 220 along the shaft portion 230. The pressing portion 240 has a spring 241 and a nut 242.

A spring 241 is arranged around a shaft portion 230 on the opposite side of the first clamp portion 210 from the second clamp portion 220.

The nut 242 is arranged on the shaft portion 230 on the side opposite to the first clamp portion 210 of the spring 241. A male screw shape is formed around the end of the shaft portion 230 opposite to the second clamp portion 220, and is screwed with the female screw shape formed inside the nut 242. The nut 242 can be moved along the shaft portion 230 by rotating it.

The spring 241 is arranged between the nut 242 and the first clamp portion 210. Since the nut 242 is screwed with the shaft portion 230 and the position on the shaft portion 230 is fixed, a load toward the second clamp portion 220 is applied to the first clamp portion 210. The load can be set, for example, in the range of 1 to 250 kgf, more preferably in the range of 2 to 200 kgf. Further, when the nuts 242 are rotated and brought close to the first clamp portion 210 with the resin pipes 11 and 12 and the electric fusion joint 1 arranged on the jig 200, the spring 241 is compressed, so that the first clamp portion 210 The load applied to the can be increased. On the other hand, when the nut 242 is rotated and moved away from the first clamp portion 210, the spring 241 expands, so that the load applied to the first clamp portion 210 can be reduced.

As shown in FIG. 7, the resin pipe 11 is formed by applying a load to the first clamp portion 210 by the pressing portion 240 in a state where the resin pipe 11, the resin pipe 12, and the electric fusion joint 1 are arranged on the jig 200. A load is applied to the pipe end 11a of the resin pipe 12 and the pipe end 12a of the resin pipe 12 so as to be pressed against the stopper portion 22.

(Regulatory Department 250)
The restricting portion 250 regulates that the first clamp portion 210 moves too much toward the second clamp portion 220 by the pressing portion 240.

The regulating portion 250 is arranged between the first clamp portion 210 and the second clamp portion 220.

The regulating portion 250 has a fixing portion 251 and a contact portion 252. The fixing portion 251 is fixed to the pedestal 260. The contact portion 252 is a portion extending upward from the fixed portion 251 and is arranged around the shaft portion 230. When the bearing portion 215 of the first clamp portion 210 abuts on the contact portion 252, it is possible to restrict the movement of the first clamp portion 210 further to the second clamp portion 220 side.

<Fusion method>
Next, a fusion method using the above-mentioned jig 200 will be described. FIG. 8 is a flow chart showing the fusion method of the present embodiment.

First, in step S1, the resin pipe 11 and the resin pipe 12 are inserted into the electric fusion joint 1. As shown in FIG. 3, the resin pipe 11 is inserted inside the joint receiving portion 23 of the electrically fused joint 1 until the stopper portion 22 restricts the relative movement of the pipe end 11a of the resin pipe 11. .. Next, the resin pipe 12 is inserted inside the joint receiving portion 24 of the electric fusion joint 1 until the stopper portion 22 restricts the relative movement of the pipe end 12a of the resin pipe 12. FIG. 3 shows a state in which the resin pipe 11 and the resin pipe 12 are inserted into the electric fusion joint 1.

In this state, in step S2, as shown in FIG. 7, the resin tube 11 is sandwiched and fixed by the first clamp portion 210, the resin tube 12 is sandwiched and fixed by the second clamp portion 220, and the resin is attached to the jig 200. The pipe 11, the electric fusion joint 1 and the resin pipe 12 are arranged. Step S1 and step S2 correspond to an example of the placement step.

By fixing the resin pipe 11, the electric fusion joint 1 and the resin pipe 12 to the jig 200, in step S3 (an example of the pressurizing step), the second clamp is applied to the first clamp portion 210 by the urging force of the pressing portion 240. A load is applied toward the portion 220. By applying a load toward the second clamp portion 220 of the first clamp portion 210, the pipe end 11a of the resin pipe 11 is pressed against the first side surface 22a of the stopper portion 22, and the pipe end 12a of the resin pipe 12 is the stopper portion 22. It is pressed against the second side surface 22b.

Next, in step S4 (an example of a heating step), the connector of the electric fusion device is attached to the two pins 61 of the connector attachment portion 6 in a pressurized state, and energization is performed for a predetermined time.

This energization causes the heating wire 51 to generate heat, and the stopper portion 22, the pipe end 11a of the resin pipe 11, and the pipe end 12a of the resin pipe 12 are melted and come into close contact with the stopper portion 22.

Since the stopper portion 22 is melted by energization and the width in the axial direction A becomes smaller and the applied load becomes smaller, the nut 242 may be moved toward the second clamp portion 220 side as necessary. By doing so, the load applied to the first clamp portion 210 by the spring 241 can be maintained or strengthened. Of course, the nut 242 may be moved to the side opposite to the second clamp portion 220 to reduce the load. It is desirable that the load does not change even if the pipe ends 11a and 12a melt, but it may change.

The heating wire temperature at the time of energization may be any temperature as long as it can melt the main body 2, and in the case of polyolefin, it is preferably 220 degrees or less.

Next, in step S5 (an example of a cooling step), the melt-connected resin pipe 11, the electrically fused joint 1, and the resin pipe 12 are cooled for a predetermined time. It is preferable to continue applying the load by the pressing portion 240 until the step S5 is completed.

FIG. 9 is a diagram showing a state in which the resin pipe 11, the electric fusion joint 1 and the resin pipe 12 are melted and connected. As shown in FIG. 9, the stopper portion 22 is melted, pushed by the resin pipes 11 and 12, narrowed, and fills the space between the resin pipe 11 and the resin pipe 12 to form a bead R.

FIG. 10A is a schematic view showing the resin pipes 11 and 12 and the stopper portion 22. FIG. 10B is a schematic view showing the resin pipes 11 and 12 and the stopper portion 22 in a state after being melted and connected. In FIG. 10B, the remaining portion remaining after the stopper portion 22 is melted is shown by 22p. FIG. 10C shows the remaining portion 22p of the stopper portion 22 and the other supplemented portion 22q. As shown in FIG. 10C, the filling portion 22q other than the remaining portion 22p of the stopper portion 22 fills the gap D surrounded by the melted resin pipe 11, the resin pipe 12, and the remaining portion 22p. The gap D is a space formed by the height from the height of the stopper portion 22 before fusion to the inner peripheral surfaces of the resin pipes 11 and 12 and the width between the resin pipe 11 and the resin pipe 12 after fusion. Is. The gap D is shown in FIG. 10 (d). In FIG. 10D, the gap D is filled in and shown. Here, in order to form the bead R that rises inward from the inner peripheral surfaces of the resin pipes 11 and 12, the volume of the filling portion 22q is set larger than the volume of the gap D. For example, it is preferable that the filling portion 22q / gap D × 100 (%) is set to 130 to 300%. The length of the width of the remaining portion 22p along the axial direction A is, for example, 1 mm.

<Use of ultrapure water with piping structure 100>
The piping structure 100 of the embodiment according to the present disclosure can be used, for example, for transporting ultrapure water. Specifically, the pipe structure 100 for ultrapure water according to the embodiment of the present disclosure includes a pipe in the ultrapure water production apparatus, a pipe for transporting ultrapure water from the ultrapure water production apparatus to a point of use, and a pipe. It can be used as a pipe for returning ultrapure water from a use point.

Ultrapure water is extremely pure water, and is suitably used for cleaning electronic devices such as semiconductor devices. There are many indicators for expressing the grade of ultrapure water, but in this embodiment, the electrical resistivity of ultrapure water is 18.2 MΩ · cm or more, and the TOC is 50 ppb or less.

The pipe structure 100 of the embodiment according to the present disclosure is used in a water pipe for nuclear power generation, a manufacturing process of pharmaceuticals, a semiconductor element or a liquid crystal, and more preferably a manufacturing process of a semiconductor element, in which the water quality required for ultrapure water is particularly strict. It is preferably a transport pipe for ultrapure water used in a wet treatment step such as cleaning. The semiconductor device is preferably one having a higher degree of integration, and more specifically, it is more preferably used in the manufacturing process of a semiconductor device having a minimum line width of 65 nm or less. Examples of the standard regarding the quality of ultrapure water used in semiconductor manufacturing include SEMI F75.

Further, since the piping structure 100 of the embodiment according to the present disclosure has a polyethylene-based resin layer, it is excellent in workability. For example, fusion construction such as EF (electric fusion) joining can be easily performed at a relatively low temperature.

<Characteristics>
In the electric fusion joint 1 of the present embodiment, the heat generating portion 5 is arranged on the stopper portion 22. By energizing the heat generating portion 5 in a state where the pipe end 11a of the resin pipe 11 (an example of the first pipe) and the pipe end 12a of the resin pipe 12 (an example of the second pipe) are pressed against the stopper portion 22 by the jig 200. , Can be melted and connected between the pipe end 11a of the resin pipe 11 and the stopper portion 22, and between the pipe end 12a of the resin pipe 12 and the stopper portion 22. Therefore, it is possible to suppress the generation of a gap between the electrically fused joint 1 and the resin pipe 11 and the resin pipe 12.

The jig 200 of the present embodiment has a restricting portion 250 that restricts the movement of the first clamp portion 210 to the second clamp portion 220. Thereby, it is possible to prevent the first clamp portion 210 from moving too much toward the second clamp portion 220. The first clamp portion 210 is configured to move toward the second clamp portion 220 by the pressing portion 240, but if it moves too much toward the second clamp portion 220, the resin tube 11 and the resin tube 12 are electrically fused. Since it becomes difficult to arrange the fitting 1 on the jig 200, this can be prevented by the regulating portion 250.

In the jig 200 of the present embodiment, the shaft portion 230 inserts the first clamp portion 210. The pressing portion 240 is attached to the shaft portion 230. As a result, the pressing portion 240 allows the first clamp portion 210 to apply a load to the resin pipe 11, the resin pipe 12, and the electric fusion splicer 1 toward the second clamp portion 220 along the shaft portion 230. ..

In the jig 200 of the present embodiment, the pressing portion 240 has a spring 241 and a nut 242 (an example of a moving member). As a result, when the nut 242 is moved to the spring 241 side, the load applied to the resin pipe 11, the resin pipe 12, and the electric fusion joint 1 can be increased by the first clamp portion 210, and the nut 242 is a spring 241. When moving to the opposite side, the load applied to the resin pipe 11, the resin pipe 12, and the electric fusion joint 1 can be reduced by the first clamp portion 210.

<Other embodiments>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the invention.

(A)
In the above embodiment, the spring 241 and the nut 242 are used as the pressing portion for applying the load to the first clamp portion 210, but the present invention is not limited to this, and the cylinder connected to the fluid pressurizing device is used. Or a motor or the like. These are preferable because the load (pressure) can be easily controlled. Further, pressing the pipe ends 11a and 11b against the stopper portion 22 may be due to either the application of a load to the first clamp portion 210 or the amount of movement.

(B)
In the above embodiment, the second clamp portion 220 is fixed and the first clamp portion 210 moves, but the present invention is not limited to this, and both the second clamp portion 220 and the first clamp portion 210 can move. It may be configured. In this case, the second clamp portion 220 may have the same configuration as the first clamp portion 210. Further, when both the first clamp portion 210 and the second clamp portion 220 move, they are evenly pressed from both sides toward the center of the electric fusion joint 1.

(C)
In the above embodiment, the heat generating portion 5 is provided only on the stopper portion 22, but the heat generating portions 7 and 8 may be provided on the joint receiving portions 23 and 24. FIG. 11 is a cross-sectional view showing an electrically fused joint 1'in which the heat generating portions 7 and 8 are provided in the joint receiving portions 23 and 24.

In the electrically fused joint 1'shown in FIG. 11, the heat generating portion 7 has a heating wire 71 embedded in the inner surface 21a at the joint receiving portion 23 which is one end of the tubular portion 21.

The heating wire 71 is arranged so as to be wound twice along the inner surface 21a along the circumferential direction. The heating wire 71 is arranged in the vicinity of the inner surface 21a. The heating wire 71 may be embedded in the tubular portion 21 so that a part of the heating wire 71 is exposed on the flow path 1f side, or may be completely embedded.

As shown in FIG. 11, the heat generating portion 8 has a heating wire 81 embedded in the inner surface 21a at the joint receiving portion 24 which is the other end of the tubular portion 21. The heating wire 81 is arranged so as to be wound twice along the inner surface 21a along the circumferential direction. The heating wire 81 is arranged in the vicinity of the inner surface 21a. The heating wire 81 may be partially embedded in the tubular portion 21 so as to be partially exposed on the flow path 1f side, or may be completely embedded.

The heating wires 71 and 81 may have the same configuration as the heating wires 51.

The configuration of the heat generating portions 7 and 8 may not be limited to the configuration shown in FIG. 11, and one heating wire may not be wound twice or may be wound three or more times. Two heating wires may be wound around. Further, although the heat generating portions 7 and 8 are provided symmetrically in FIG. 11, the heat generating portions 7 and 8 are not limited to the left-right symmetry. Although the heat generating portions 7 and 8 are provided next to the stopper portion 22, they may be provided at predetermined intervals.

Further, in the configuration of FIG. 11, the heating wire 71 and the heating wire 81 are in contact with each other, but all or part of them may not be in contact with each other.

(D)
In the above embodiment, the outer diameter of the stopper portion 22 is circular when viewed along the axial direction A, but it is not limited to a circle and may be a polygonal shape.

(E)
In the above embodiment, the flow paths of the electric fusion joints 1 and 1'are all formed in a straight line, but an elbow joint in which the flow paths are curved may be used.

(F)
In the above embodiment and (B), since the same heating wires 51, 71, 81 of the heating units 5, 7, and 8 are used, all the heating wires 51, 71, 81 are provided with an insulating film. However, it does not have to be limited to this. However, it is preferable that at least the heating wire 51 is provided with an insulating film. This is because the heating wires 51 are easily brought into contact with each other under pressure by the resin pipe 11 and the resin pipe 12.

(G)
In the above embodiment, the resin pipe 11 and the resin pipe 12 are pressed against the electric fusion joint 1 by the pressing portion 240 before the heat generating portion 5 is energized, but after the heating portion 5 is energized, the energization is in progress. Pressurization may be performed from.

1: Electric fusion joint 11: Resin pipe 11a: Pipe end 12: Resin pipe 12a: Pipe end 22: Stopper part 200: Jig 210: First clamp part 220: Second clamp part 230: Shaft part 240: Pressing part

Claims (6)

A tubular main body having joint receiving portions at both ends into which a pipe can be inserted inward, a stopper portion provided so as to project inside the inner surface of the main body portion, and an insulator arranged in the stopper portion. A jig used to connect a first pipe and a second pipe via an electric fusion joint provided with a heat generating portion including a coated heating wire.
The first clamp portion for fixing the first pipe and
A second clamp portion for fixing the second pipe so as to be located on the same axis as the first pipe,
A shaft portion to which the first clamp portion is movably attached and arranged in parallel with the axis of the first pipe fixed to the first clamp portion, and a shaft portion.
The pipe end of the first pipe inserted inside the one joint receiving portion abuts on the stopper portion, and the pipe end of the second pipe inserted inside the other joint receiving portion is said. A pressing portion that presses the first clamp portion toward the second clamp portion along the shaft portion in a state of being in contact with the stopper portion is provided.
jig. Further provided with a restricting portion for restricting the movement of the first clamp portion toward the second clamp portion.
The jig according to claim 1. The shaft portion is inserted through the first clamp portion, and the shaft portion is inserted.
The pressing portion is attached to the shaft portion.
The jig according to claim 1 or 2. The pressing portion has a spring, a motor or a cylinder.
The jig according to any one of claims 1 to 3. The pressing part is
A spring arranged on the shaft portion on the opposite side of the first clamp portion from the second clamp portion, and
It has a moving member which is arranged on the shaft portion on the opposite side of the first clamp portion of the spring and moves along the shaft portion to adjust the compression amount of the spring.
The jig according to any one of claims 1 to 3. A tubular main body having joint receiving portions at both ends into which a pipe can be inserted inward, a stopper portion provided so as to project inward on the inner surface of the main body portion, and an insulator arranged in the stopper portion. It is a fusion method in which the first pipe and the second pipe are connected by using a jig via an electric fusion joint having a heat generating portion including a heating wire coated on the surface.
The first pipe is fixed by the first clamp portion of the jig so that the first pipe and the second pipe are inserted into the joint receiving portions at both ends, and the second clamp portion of the jig fixes the first pipe. An arrangement step of fixing the second pipe so as to be located on the same axis as the first pipe and arranging the electric fusion joint between the first pipe and the second pipe.
After the arrangement step, a heating step of heating the heat generating portion to melt and connect the first pipe, the electric fusion joint, and the second pipe,
A pressing step for pressing the first clamp portion toward the second clamp portion side is provided before, during, or after the heating step.
Fusion method.

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