JPH11280980A - Fusion induction coil and fusion method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] By preparing only one kind, it is possible to reduce the manufacturing cost by being able to cope with the fusion of a plurality of sizes of fusion members, and to reduce the power consumption and shorten the work time. The cost can be reduced. SOLUTION: It is installed outside a plastic pipe repairing member 1 having an inner circumferential surface 2a curved along the outer circumferential surface of a plastic pipe 10 and a heater 3 which generates heat by energization on the inner circumferential surface 2a side. A plurality of energizing terminals 7A, 7B, 7C, 7D are provided in the middle of the coil 5 for energizing the heater 3 with a high-frequency current by electromagnetic induction. The connection between the two terminals and the two terminals 6A and 6B of the high-frequency power source 6 can be switched, and electricity is supplied only to the coil portion having a length range corresponding to the size of the repair member 1 so that the area can be changed within the area range corresponding to the size of the heater 3. The plastic pipe repairing member 1 and the plastic pipe 10 are configured to be thermally fused and joined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a repair member for repairing a flaw generated in an existing pipe such as a gas pipe is heat-welded or a branch saddle is heat-welded to the existing pipe. More specifically, the present invention relates to a fusion induction coil and a fusion method to be used. More specifically, a plastic plate-like repairer disposed on an outer peripheral surface of a plastic tube made of a polyolefin resin such as polyethylene or polypropylene so as to cover a damaged portion of the tube. A fusion member such as a member or a saddle for branching and a plastic tube are mutually fused by applying a high-frequency current by electromagnetic induction to a heater embedded in the inner peripheral surface side of the fusion member to generate heat. The present invention relates to a fusion induction coil to be joined and a fusion method.

[0002]

2. Description of the Related Art In a fusion method using a fusion induction coil of this type, the size of a fusion member used in accordance with the size of a damaged portion generated in a plastic tube, the size of a branch aperture, and the size of the member are determined. The size of the heater embedded on the inner peripheral surface side is determined. Therefore, in order to give an appropriate amount of heat to the heaters of the fusion members having different sizes, conventionally, induction coils having different sizes for each size of the fusion members have been used as induction coils for supplying high-frequency current to the heater by electromagnetic induction. Has been adopted in which the welding area is changed by selectively using.

[0003]

However, in the case of the conventional fusion induction coil and the fusion method as described above, the size of the damaged portion generated in the plastic pipe varies, and the type of the branch diameter differs. In order to cope with these, a plurality of types of induction coils having different sizes for each size of the welding member are prepared (conventionally prepared), and a damaged portion or a branch diameter actually generated in the plastic pipe is determined. It is necessary to select and use one of a plurality of types of induction coils according to the size. As described above, the necessity of constantly providing a plurality of types of induction coils having different sizes increases the production cost of each coil, which causes a rise in the fusion work cost. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and by preparing only one kind, it is possible to cope with the fusion of a plurality of sizes of fusion members, thereby reducing manufacturing costs and reducing power consumption. An object of the present invention is to provide a fusion induction coil and a fusion method that can reduce the operation cost by suppressing the amount and shortening the operation time.

[0005]

In order to achieve the above object, a fusion induction coil according to a first aspect of the present invention is a curved plate-shaped member having an inner peripheral surface curved along the outer peripheral surface of a plastic pipe. An electromagnetic induction installed outside the plate-like member at a location corresponding to the heater to fuse a plate-like member for fusion having a heater embedded on the inner peripheral surface thereof to the outer peripheral surface of the plastic pipe. A coil, wherein a plurality of energizing terminals are provided in the middle of the coil, and connection between two of the plurality of energizing terminals and both terminals of the high-frequency power supply can be switched.

According to a second aspect of the present invention, in the fusing method, a welding member in which a heater is embedded on the inner peripheral surface side of the curved plate-like member is installed in a posture along the outer peripheral surface of the plastic pipe. After being fixed to the outer peripheral portion of the plastic tube, the high-frequency power is supplied from a high-frequency power supply to a coil portion of the electromagnetic induction coil disposed outside the fusion member, which corresponds to the heater, so that the heater is electromagnetically induced. Then, the fusion member and the plastic pipe are fusion-bonded to each other in an area corresponding to the heater.

[0007] According to the above construction, the fusion bonding member has a curved inner peripheral surface along the outer peripheral surface of the plastic pipe, and the heater surrounds the damaged portion of the plastic pipe and the branch opening of the branch saddle. After being placed in a proper posture, it is fixed to a plastic tube using a fixing jig, and in this state, high-frequency power is supplied from a high-frequency power supply to a coil disposed outside the welding member, so that the heater is electromagnetically induced. A high-frequency current is applied to generate heat, and the outer peripheral surface of the plastic pipe and the inner peripheral surface of the welding member are fusion-bonded to each other to repair or branch a damaged portion.

At the time of the above-mentioned fusion bonding, fusion members having different sizes are used according to the size of the damaged portion generated in the plastic pipe and the branch diameter of the branch saddle. By supplying high-frequency current only to the coil portion of the coil corresponding to the size of the heater buried on the inner peripheral surface side of the welding member to be used, the appropriate high frequency is always supplied to the heater of each size by electromagnetic induction. By applying an electric current, the fusion bonding member and the plastic tube can be fusion bonded to each other in an area range corresponding to the size of the heater. Thus, by preparing only one kind of fusion induction coil, it can be used for fusion bonding of fusion members of any size.

In addition, instead of using a single induction coil that is merely large to accommodate fusion members of all sizes, the range of energization to the coil is changed according to the size of the fusion member. Therefore, when a small-sized fusion-bonding member is fusion-bonded, it is not necessary to supply an additional current to the entire length of the coil, so that waste of power consumption can be eliminated and work time can be reduced as much as possible. It is possible.

Furthermore, when a large-sized fusion-bonding member is fusion-bonded, it is possible to perform fusion-bonding in a predetermined area using a small-capacity high-frequency power source by sequentially switching the energizing region to the coil. is there.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, and is a perspective view of a plastic pipe repairing member applied as a welding member. The plastic pipe repairing member 1 is made of a polyolefin such as polyethylene or polypropylene. A plastic plate-like repairing member 2 having an inner peripheral surface 2a curved in an arc shape along the outer peripheral surface of a plastic tube 10 made of a plastic resin and made of a polyolefin resin similar to the plastic tube 10; A heater 3 made of a magnetic alloy, iron, stainless steel or the like embedded in an annular shape is provided on the inner peripheral surface side of the shape repairing member 2.

The plate-like repair member 2 is made of a plastic pipe 1
The heater 3 is formed, for example, in a rectangular shape having a size capable of covering a predetermined range of the damaged portion 11 generated in the heater 3.
Is made by braiding a material such as a magnetic alloy wire having a predetermined Curie temperature into a net shape.

FIG. 2 is a plan view showing a fusion induction coil device which is used by being installed at a location corresponding to the heater 3 outside the plate-like repair member 2 in the above-mentioned plastic pipe repair member 1. The induction coil device 4 includes a coil 5 and a plurality of (four in the drawing, but three or more shown) energizing terminals 7A, 7B, 7C provided at both ends and in the middle of the coil 5. , 7D, a high-frequency power supply 6 for supplying a high-frequency current to the heater 3 by electromagnetic induction by supplying high-frequency power to the coil 5, and a selection from the four current-carrying terminals 7A, 7B, 7C, 7D. Two terminals and both terminals 6A of the high-frequency power source 6,
Movable changeover switch 8 for switching the connection state with 6B
A, 8B.

In the fusion induction coil device 4 having the above-described configuration, both terminals 6A and 6B of the high-frequency power source 6 and the four energizing terminals 7A, 7B, 7C and 7D are provided via the movable changeover switches 8A and 8B. 3 (a),
By switching the connection state between the two terminals 7A and 7B, 7B and 7C or 7C and 7D in the combination as shown in (b) and (c), high-frequency power is supplied from the high-frequency power source 6 of the coil 5. Figure 3 shows the coil part
The areas x, y, and s in which the oblique lines of (a), (b) and (c) are inserted
It is configured to be changeable to z.

Next, a repair operation procedure for repairing the damaged portion 11 generated in the plastic pipe 10 by using the plastic pipe repair member 1 having the above-described configuration will be described. First, as shown in FIG. 4, the plate-shaped repairing member 2 of the plastic pipe repairing member 1 has a curved inner peripheral surface 2a along the outer peripheral surface of the plastic tube 10 to be repaired, and the heater 3 The plate-shaped repair member 2 is fixed to the plastic tube 10 by using a fixing jig 12 such as a plastic band after disposing the plate-shaped repair member 2 so as to surround the damaged portion 11.

Next, as shown in FIGS. 5 and 6, the coil 5 of the fusion induction coil device 4 is disposed outside the plate-like repair member 2 at a location corresponding to the heater 3.
The movable switch 8A corresponding to the size of the plate-shaped repair member 2,
By operating 8B, both terminals 6A and 6B of the high-frequency power supply 6 are operated.
, Two combination terminals 7A and 7B, 7B to be connected to
And 7C, or 7C and 7D, and selectively switches the high frequency from the high frequency power supply 6 only to the coil portions of the hatched areas x, y, and z in FIGS. 3 (a), 3 (b) and 3 (c). Supply power.

As a result, a high frequency current is applied to the heater 3 of the plastic pipe repairing member 1 by electromagnetic induction, and the heater 3 is rapidly heated by a skin effect, so that the outer peripheral surface of the plastic pipe 10 and the plate-like shape near the Curie temperature. The inner peripheral surface 2a of the repair member 2 is fusion-bonded to an area corresponding to the size of the magnetic alloy heater 3, and the damaged portion 11 of the plastic tube 10 is repaired by fusion of the repair member 1.

As described above, the heater in the repair member 1 of the coil 5 corresponds to the size of the repair member 1 used and selected according to the size of the damaged portion 11 generated in the plastic pipe 10. By supplying a high-frequency current only to the coil portion in a range corresponding to the size of the heater 3, an appropriate high-frequency current is always supplied to the heaters 3 of each size by electromagnetic induction so that the heater 3 has an area corresponding to the size of the heater 3. The fusion bonding between the plate-shaped repair member 2 and the plastic pipe 10 becomes possible. Thus, by preparing only one kind of fusion induction coil device 4, it can be used for fusion bonding of the repair member 1 of any size.

Also, instead of using a single induction coil device that is merely large to accommodate repair members of all sizes, the range of energization to the coil 5 is changed according to the size of the repair member 1. Therefore, when the repair member 1 having a small size is fused and joined, there is no need to supply an additional current to the entire length of the coil 5, so that waste of power consumption can be eliminated and work time can be reduced as much as possible. It is possible.

FIGS. 7 and 8 show a second embodiment of the present invention. FIG. 7 is a perspective view of a plastic pipe branching saddle applied as a plastic pipe welding member and a fusion splicing apparatus for use in the same. It is a top view showing a wearing induction coil device. The plastic pipe branch saddle 1 'used in the second embodiment has an inner peripheral surface 2a' curved in an arc along the outer peripheral surface of a plastic pipe 10 made of a polyolefin resin such as polyethylene or polypropylene.
And a branch take-out tube portion 2B at the center thereof.
And a plate-shaped member 2A made of plastic made of the same polyolefin resin as the plastic tube 10 and formed in a rectangular shape, and a predetermined Curie temperature (1).
(30 to 200 ° C.), a braid made of a material such as a magnetic alloy wire or the like, which is embedded in an annular shape around the inner peripheral surface of the plate-like member 2A on the outer periphery of the branch take-out tube portion 2B. 3 is provided.

The fusion induction coil device 4 'has basically the same structure as that shown in the first embodiment, except that the center of the coil 5 has the branch saddle. 1 'is formed with a hole 5a for fitting into a branch take-out tube portion 2B integrally protruded and formed at the center of the plate-like member 2A in 1', and the same or corresponding portions are denoted by the same reference numerals. Therefore, detailed description thereof will be omitted.

Further, similarly to the first embodiment, the procedure for using the fusion induction coil device 4 'in the second embodiment corresponds to the size of the branch saddle 1'. By supplying a high-frequency current only to the coil portion in a range corresponding to the size of the magnetic alloy heater 3 on the side of the branch saddle 1 ', an appropriate high-frequency current is always supplied to the heater 3 of each size by electromagnetic induction. Thus, it is possible to perform a predetermined pipe branch by fusing and joining the plate-shaped repair member 2A and the plastic pipe 10 in an area range corresponding to the size of the heater 3.

[0023]

As described above, according to the present invention, a plurality of coils having different sizes to be selected and used in accordance with the size of a damaged portion generated in a plastic tube and the branch diameter of a branch saddle in a coil. By supplying a high-frequency current only to the coil portion in the range corresponding to the size of the heater in the fusing member, when the fusing member of any size is fusion-bonded, it is always appropriate for the heater of each size by electromagnetic induction. By applying a high-frequency current, the plate member and the plastic pipe can be fusion-bonded in an appropriate area range. Therefore, one kind of fusion induction coil to be prepared may be used, and the manufacturing cost and the management cost can be reduced accordingly. Also, instead of using a single induction coil that is merely large to accommodate fusion members of any size, the energization range to the coil is changed according to the size of the fusion member, so that the size is small. It is not necessary to apply an extra current to the entire length of the coil when heat-sealing the fusion members of the size, and it is possible to reduce the power consumption and the welding operation time, thereby reducing the operation cost. .

In addition, when a large-sized fusion-bonding member is fusion-bonded, by sequentially switching the energizing region to the coil, it is possible to perform fusion-bonding in a predetermined area using a small-capacity high-frequency power supply. To play.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a perspective view of a plastic pipe repairing member applied as a welding member.

FIG. 2 is a plan view showing a fusion guiding apparatus used in the first embodiment.

3 (a), 3 (b) and 3 (c) are explanatory diagrams of switching of a terminal connection state in the fusion induction coil device.

FIG. 4 is a perspective view showing a state in which the plastic pipe repairing member is fixed to the plastic pipe.

FIG. 5 is a perspective view showing a state in which an induction current is applied from a fusion induction coil device to a heater in a plastic pipe repair member.

FIG. 6 is a vertical sectional side view of FIG. 5;

FIG. 7 shows a second embodiment of the present invention, and is a perspective view of a saddle for plastic pipe branching applied as a welding member.

FIG. 8 is a plan view showing a fusion induction coil device used in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Repair member for plastic pipes 1 'Saddle fusion member for plastic pipe branch 2, 2A Plate-like repair member 2a Inner peripheral surface 3 Heater 4 Induction coil device for fusion 4' Induction coil device for fusion 6 High frequency power supply 6A, 6B Both terminals 7A, 7B, 7C, 7D Conducting terminals 8A, 8B Movable selector switch 10 Plastic tube

Continued on the front page (72) Inventor Hidekazu Enomoto 64 Ishizu-Kitacho, Sakai-shi, Osaka Inside Kubota Vinyl Pipe Factory

Claims (2)

[Claims] 1. A fusion-bonded plate member in which a heater is buried on an inner peripheral surface side of a curved plate member having an inner peripheral surface curved along the outer peripheral surface of the plastic tube is provided on the outer peripheral surface of the plastic tube. An electromagnetic induction coil installed at a location corresponding to the heater outside of the plate member for fusion, and provided with a plurality of energizing terminals in the middle of the coil, and among the plurality of energizing terminals, Characterized in that the connection between the two terminals and the two terminals of the high-frequency power supply can be switched. 2. A welding member having a heater embedded on the inner peripheral surface side of a curved plate-like member is installed in a posture along the outer peripheral surface of a plastic pipe and fixed to the outer peripheral part of the plastic pipe. By supplying high-frequency power from a high-frequency power supply to a coil portion in a range corresponding to the heater among the electromagnetic induction coils disposed outside the member, the heater is heated by electromagnetic induction so that the area in the area corresponding to the heater is increased. A fusion method, wherein a fusion bonding member and a plastic tube are fusion bonded.