JPH10278117A - Heating coil for connection of resin-made pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an excellent connection state by a method wherein a heating coil is wound so as to have a parallel part parallel to a longitudinal direction of a resin-made pipe along an outer peripheral surface of the resin-made pipe. SOLUTION: A coil part 4 presents a shape of being bent in a semicircular arch state along outer peripheral surfaces of resin-made pipes P1, P2, and a parallel part 4a parallel to longitudinal directions of the resin-made pipes P1, P2 is provided. Then, by inserting an almost central part in a longitudinal direction of the parallel part 4a into a hole 22a of a block 22 fixed to a tip part 2a of a coil support member 2, it is fitted to the tip part 2a of the coil support member 2. Consequently, a connection part S of two pieces of the resin- made pipes P1, P2 can be gradually melted by heating, and the melted resin is surely mixed to obtain an excellent connection state without opening a hole caused by excessive melting of the connection part S.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating coil for connecting a resin pipe used for connecting a resin pipe by high-frequency induction heating.

[0002]

2. Description of the Related Art Conventionally, for example, vinyl chloride pipes (hereinafter referred to as resin pipes) used for pipes of water and various solutions and pipes for electric wiring are set to a predetermined length in advance. It is necessary to connect using a joint or the like depending on the situation. This connection generally applies a predetermined adhesive to the outer peripheral surface of the end surface of the resin pipe to be connected,
This coated part is fitted into the joint, or the end of one resin pipe is heated to increase the diameter, and the coated part of the other resin pipe coated with the adhesive is fitted,
The connection is established by curing the adhesive by leaving it for a predetermined time.

However, in such a connection method, a good connection state is hardly obtained, and a stable connection state cannot be obtained for a long period of time. A resin member that applies a heat-generating member that generates heat by induction heating and generates heat by flowing a high-frequency current through a heating coil connected to a high-frequency induction heating device, thereby melting and connecting a connection portion of a resin pipe. Application for pipe connection method.

[0004]

However, the heating coil used for this connection generally has a structure wound substantially cylindrically along the circumferential direction of the outer peripheral surface of the resin pipe. Therefore, there is a problem that it is difficult to obtain a good connection state of the connection portion. That is, when the heating coil is wound in the circumferential direction of the resin pipe, the eddy current induced in the heating member from the heating coil increases, the heating efficiency becomes higher than necessary, and the connection portion of the resin pipe is melted. Too much, and a good connection state cannot be obtained.

The above-mentioned heating coil is connected to an output terminal of a high-frequency induction heating device via a flexible cable. The length of this cable is generally determined by the work of connecting a resin pipe. Since the operation is performed outdoors and the position of the heating coil is appropriately changed, a certain length is required.
When the length of the cable is increased, a current loss occurs in the cable itself. Therefore, the output of the high-frequency induction heating device must be increased in anticipation of the loss, and the high-frequency induction heating device itself becomes large and transported. However, there has been a problem that the workability of the connection work is inferior, for example, it becomes very troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating coil for connecting a resin pipe which can obtain a good connection state. An object of the invention described in any one of the first to fifth aspects is to provide a heating coil for connecting a resin pipe, which can obtain a good connection state and improve the workability of the connection work.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an eddy current is induced in a heat generating member disposed at a connection portion of at least two resin pipes, and the eddy current is induced. A heating coil for connecting a pipe, wherein the heating coil is wound so as to have a parallel portion along an outer peripheral surface of the resin pipe and parallel to a longitudinal direction of the resin pipe.

With this configuration, when a high-frequency current is supplied to the heating coil, an eddy current based on the lines of magnetic force is induced by the heating member applied to the connection portion of the resin pipe, and the heating member is heated. Generates heat. At the time of this heat generation, since the heating coil has a parallel portion along the outer peripheral surface of the connection portion and parallel to the longitudinal direction of the resin pipe, rapid heat generation at the connection portion is prevented, and the connection portion gradually generates heat and Melts, and a good connection state is obtained.

According to a second aspect of the present invention, there is provided a heating coil for connecting a resin pipe by inducing an eddy current in a heat-generating member disposed at a connection portion of at least two resin pipes. The heating coil is disposed on the openable and closable coil support member divided into two along the longitudinal direction of the resin pipe, and wound so as to have a parallel portion parallel to the longitudinal direction along the outer peripheral surface of the resin pipe. It is characterized by being turned.

[0010] With this configuration, the connection portion gradually heats up to obtain a good connection state, and the coil supporting member for supporting the heating coil is divided into two parts so that it can be opened and closed. The heating coil can be set from the outer peripheral surface side of the connection portion of the resin pipe, and the workability of the connection operation is improved.

Further, the invention according to claim 3 is characterized in that a resonance capacitor is provided on at least one of the coil supporting members. With this configuration,
Since the resonance capacitor is provided on the coil supporting member that supports the heating coil, current loss of the cable connecting the heating coil and the high-frequency induction heating device is reduced by the resonance capacitor, and the high-frequency induction heating device can be downsized. Plan,
The workability of the connection work is further improved, for example, the movement of the device is facilitated.

The invention according to claim 4 is characterized in that the coil support member is provided with a heating switch that can start or stop energizing the heating coil. With such a configuration, the current supply of the heating coil can be performed in the heating coil unit, and even when the heating coil is away from the high-frequency induction heating device, it can be easily operated, The workability of the connection work is further improved.

The invention according to claim 5 is characterized in that the coil supporting member is configured to be openable and closable, and at least one of the coil supporting members is provided with a handle. With this configuration, it is easy to carry the heating coil and set the heating coil to the connection site, and the workability of the connection operation is further improved.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 6 show one embodiment of a heating coil for connecting a resin pipe according to the present invention. FIG. 1 is a front view, FIG. 2 is a plan view, and FIG. 4, FIG. 4 is a right side view of the main part of FIG. 1, FIG. 5 is a plan view of the coil part, and FIG. 6 is a right side view thereof.

1 to 4, a heating coil 1 includes a pair of coil support members 2, 3, and the coil support members 2, 3,
3, a pair of coil portions 4 provided at the distal end portions 2a, 3a;
5 and a resonance capacitor 6 and the like provided on one of the coil support members 3. The coil supporting members 2 and 3 are formed of an insulating synthetic resin material such as a Duracon, for example, and a pair of bearing plates 7 and 8 provided at a substantially middle position in the longitudinal direction.
Are linked by

That is, one end sides 7a, 8 of the bearing plates 7, 8
A coil support member 2 is fixed to the a by a bolt 9, and a coil rotatable between the other end sides 7b, 8b of the bearing plates 7, 8 in a direction indicated by an arrow B in FIG. A support member 3 is provided. A spring 11 is interposed between the opposing surfaces of the coil supporting members 2 and 3 on the rear side of the bearing plates 7 and 8, and the coil supporting members 2 and 3 are constantly moved by the spring 11 in the direction of arrow B (coil supporting member). 3 is a coil support member 2
), And the opposing surfaces of the coil portions 4 and 5 provided at the distal ends of the coil support members 2 and 3 are normally in contact with each other.

Incidentally, both ends of the spring 11 are provided with holes 13 of a screw 13 screwed into screw holes 12 of the coil supporting members 2 and 3, respectively.
a, and the screw holes 1 of the screw 13
The spring 11 is configured such that the spring force of the spring 11 can be adjusted according to the amount of screwing into the spring 2.

Also, behind the fixed side coil support member 2, a handle portion 1 for an operator to grip the heating coil 1 is provided.
A heating switch 15 is provided on the upper surface of the front end of the handle 14. One end of a flexible control cable 16 is connected to a terminal of the heating switch 15, and the cable 16 is inserted into through-holes of the coil supporting member 2 and the coil supporting member 3,
The other end drawn from the coil supporting member 3 is connected to a control circuit of a transistor inverter (not shown).

On the other hand, the resonance capacitor 6 is disposed on the side of the coil support member 3 on the rotating side opposite to the side opposite to the coil support member 2,
A grip 18 is formed behind the shaft 10. The resonance capacitor 6 is formed in a substantially rectangular parallelepiped shape.
The connection is fixed by 0 or the like. The other end of the cable 19 is connected to the output terminal of the transistor inverter. The resonance capacitor 6 is connected in parallel with the coil portions 4 and 5 of the heating coil 1, and is mounted with both side surfaces sandwiched between a pair of capacitor mounting plates 21.

The coil units 4 and 5 are arranged in a state of being divided (electrically in series or in parallel) into the distal ends 2a and 2b of the coil support members 2 and 3, and each coil unit 4
5 is a resin pipe P1, as shown in FIGS.
It is wound along substantially half of the outer peripheral surface of P2 (see FIG. 2). 5 and 6, one of the coil portions 4
Only the other coil part 5 is wound in a similar manner.

The coil portions 4 and 5 are formed, for example, by winding a Teflon-coated wire in a spiral shape on a plane and bending the wires in a semicircular shape along the outer peripheral surfaces of the resin pipes P1 and P2. It has parallel portions 4a and 5a (parallel portions 5a are not shown) parallel to the longitudinal direction of P1 and P2.

The substantially central portions of the parallel portions 4a, 5a in the longitudinal direction are formed by the tip portions 2a of the coil supporting members 2, 3, respectively.
3a are inserted into the holes 22a of the block 22 respectively fixed to the distal ends 2 of the coil support members 2, 3.
a, 3a. The coil portion 4 attached to the fixed-side coil support member 2 and the coil portion 5 attached to the rotating-side coil support member 3 are connected to a connecting portion 23.
(See FIG. 5), for example, they are connected in series.

The connecting portion 23 has a slack of a predetermined length so that the coil supporting members 2 and 3 can rotate. The coil portions 4 and 5 are made of resin for ensuring safety. As shown by a two-dot chain line in FIG. 1, it is coated with a coil cover 24 of an appropriate shape made of, for example, a non-magnetic material.

Next, an example of a method of using the heating coil 1 will be described. First, the cables 16 and 18 connected to the heating coil 1 are connected to a transistor inverter, and the handle 14 of the heating coil 1 is held by hand, and the heating coil 1 is moved to the position of the resin pipes P1 and P2 to be connected. To move. Then, the user grips the grip portion 18 of the coil support member 3 while holding the handle portion 14 of the coil support member 2, and rotates the coil support member 3 with respect to the coil support member 2 in the direction of arrow a in FIG. Thereby, the coil support member 2,
3, the tip portions 2a, 3a, that is, the coil portions 4, 5 are opened.

When the coil portions 4 and 5 are opened, the connection portions S (the paste-like substance obtained by mixing a magnetic substance) of the resin pipes P1 and P2 are applied inside the coil portions 4 and 5. Joint), release the gripping portion 18 of the coil supporting member 3, and move the distal end 2 of the coil supporting members 2 and 3.
a, 3a are closed. As a result, the connection portion S of the resin pipes P1, P2 is located in the coil portions 4, 5 of the heating coil 1, and the heating switch 15 is turned on with a finger in this state.

When the heating switch 15 is turned on, a high-frequency current is supplied from the transistor inverter to the coil portions 4 and 5 via the cable 19, and the magnetic lines of force generated from the coil portions 4 and 5 act on the heat generating member, and An eddy current is induced in the current. The heating member generates heat due to the eddy current,
The connection site S of the resin pipes P1 and P2 to which the heating member is applied is melted. At this time, since the coil portions 4 and 5 of the heating coil 1 are wound in a shape along the outer peripheral surfaces of the resin pipes P1 and P2 to form the parallel portions 4a and 5a, heat generated by the heat generating member due to the lines of magnetic force is generated. Is done slowly rather than abruptly.

After heating for a predetermined time, the heating switch 15 is turned off, the supply of the high-frequency current to the coil portions 4 and 5 is stopped, and the grip portion 18 of the coil support member 3 is gripped and the coil support member 3 is rotated. Then, the tip portions 2a, 3a are opened, and the coil portions 4, 5 are removed from the connection site S of the resin pipes P1, P2. As a result, the two resin pipes P1 and P2 are connected.

As described above, in the heating coil 1 of the above-described embodiment, the coil portions 4, 5 are formed along the outer peripheral shape of the resin pipes P1, P2 and parallel to the longitudinal direction of the resin pipes P1, P2. Since it is wound so as to have the parallel portions 4a and 5a, the connection portion S of the two resin pipes P1 and P2 can be gradually heated and melted, and the connection portion S is excessively melted and a hole is opened. In addition, the molten resin is surely mixed and a good connection state can be obtained.

Since the heating switch 15 is provided on one of the coil supporting members 2 of the heating coil 1, a high-frequency current can be supplied from the transistor inverter via the cable 19 while holding the heating coil 1 by hand. This eliminates the need to move to the installation location of the transistor inverter one by one at the time of connection work and turn on the heating switch of the transistor inverter. At that time, especially the heating switch 15
By providing the handle on the tip end side of the handle portion 14, an on / off operation by a finger becomes possible, and the work of energizing the heating coil 1 is extremely simplified.

Since the handle 14 is provided on one of the coil support members 2 of the heating coil 1, the handle 1
By holding the heating coil 4 by hand, the heating coil 1 can be easily transported and the resin pipes P1 and P2 can be easily set at the connection site S, and the coil supporting members 2 and 3 of the heating coil 1 can be opened and closed. With this configuration, after connecting the resin pipes P1 and P2 with a joint, the heating coil 1 can be easily set at the connection site S from the outer peripheral surface side.

In particular, by simply gripping the gripping portion 18 of the coil supporting member 3 with respect to the fixed-side coil supporting member 2 having the handle portion 14, the coil supporting member 3 rotates and the coil portions 4, 5, Is opened, the opening and closing operations of the coil portions 4 and 5 can be smoothly performed, and after the resin pipes P1 and P2 are set, the hand is released from the gripping portion 18 so that the coil supporting member 3 is biased by the spring 11 To close automatically,
The opening / closing operation of the coil units 4 and 5, that is, the setting operation to the connection site S can be performed more easily.

Since the spring force of the spring 11 can be adjusted by rotating the screw 13 into the screw hole 12, the opening / closing operation is performed according to the grip force of the worker and the outer diameter of the resin pipes P1, P2 to be connected. can do. From these facts, the workability of the connection work of the resin pipes P1 and P2 can be greatly improved, and a great effect can be expected particularly since this kind of work is an on-site work such as outdoors.

Further, since the resonance capacitor 6 is provided on the movable coil supporting member 3, even if the cable 19 connecting the heating coil 1 and the transistor inverter is long, the transmission loss of the current by the cable 19 is reduced. Can be suppressed as much as possible, and the output of the transistor inverter needs to be increased, so that the size of the transistor inverter can be reduced. As a result, the transistor inverter and the heating coil 1 can be easily transported to the connection site, and the power consumption of the transistor inverter can be reduced. For example, the power consumption at the connection site can be reduced.

The coil units 4 and 5 in the above embodiment are used.
Is an example, for example, as shown by a two-dot chain line in FIG. 1, 1 to 5 extending outward on the contact surface side of the coil portions 4 and 5.
By providing the turn-like widened portion 26, it is possible to compensate for a decrease in the magnetic field lines on the contact surface side and to make the temperature distribution over the entire circumference of the connection portion S more uniform.

Further, the resin pipe P in the above embodiment is used.
1, the outer diameter of P2, the number of turns of the coil portions 4, 5, the shapes of the coil support members 2, 3 and their opening / closing structure, the shape of the handle portion 14, the mounting position of the heating switch 15, the mounting position of the resonance capacitor 6, etc. This is merely an example, and it goes without saying that various changes can be made without departing from the spirit of each invention.

[0036]

As described above in detail, according to the first aspect of the present invention, the connection portion of the resin pipe can be gradually heated, and the molten resin is surely mixed, thereby achieving a good connection. You can get the status.

According to the second to fifth aspects of the present invention, in addition to the effects of the first aspect of the present invention, the workability of the connection work can be greatly improved, and the connection work can be performed at a connection site such as outdoors. However, there is an effect that the connection operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view of a heating coil for connecting a resin pipe according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a left side view of a main part of FIG. 1;

FIG. 4 is a right side view of a main part of FIG.

FIG. 5 is a plan view of the coil unit.

FIG. 6 is a right side view of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating coil 2, 3 Coil support member 2a, 3a Tip part 4, 5 Coil part 4a, 5a Parallel part 6 Resonant capacitor 10 Axis 11 Spring 14 Handle 15 Heating switch 16, 19 Cable 18 Holding part P1, P2 Resin Pipe S connection site

Claims (5)

[Claims] A heating coil for connecting a resin pipe by inducing eddy current in a heating member disposed at a connection portion of at least two resin pipes, wherein the heating coil is made of a resin. A heating coil for connecting a resin pipe, which is wound so as to have a parallel portion along the outer peripheral surface of the pipe and parallel to the longitudinal direction of the resin pipe. 2. A heating coil for connecting a resin pipe by inducing an eddy current in a heating member disposed at a connection portion of at least two resin pipes, wherein the heating coil is made of a resin. It is arranged on an openable and closable coil supporting member divided into two along the longitudinal direction of the pipe, and is wound so as to have a parallel portion parallel to the longitudinal direction along the outer peripheral surface of the resin pipe. Heating coil for connecting a resin pipe. 3. A heating coil for connecting a resin pipe according to claim 2, wherein a resonance capacitor is provided on at least one of said coil supporting members. 4. A resin pipe connection according to claim 2, wherein said coil support member is provided with a heating switch capable of starting or shutting off current supply to said heating coil. Heating coil. 5. The resin pipe according to claim 2, wherein the coil supporting member is configured to be openable and closable, and a handle is provided on at least one of the coil supporting members. Heating coil for connection.