JP2002158086A - Segment-uniting induction heating coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an induction heating coil which can be easily attached to and detached from a heated object from its side. SOLUTION: By dividing in half a cable way conductor 3 constituting a multi-coil spiral cable way so as to have segments 2, 2 to the direction of its axis, the conductor is allowed to be attached to and detached from a heated object from the side, and, further, by connecting a cooling water way of the cable way conductor with a hose forming a by-pass equipped in each segment 2, water channel is composed in a shape in which water can be introduced to the cooling water way of the whole cable way conductor in a state of non- combination before uniting the divided segments 2, 2, and, it is so constructed that a water way connection work at time of uniting of the segments 2, 2 has only to be done at a water-feeding/draining end.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil for inductively heating a metal member such as a steel pipe, and more particularly, to a two-segment combined type which can be used efficiently even at a work site where use conditions are greatly restricted. It relates to an induction heating coil.

[0002]

2. Description of the Related Art A steel pipe is a member most suitable for utilizing induction heating. This is because 1 is a material that can be efficiently induction-heated, and 2 has a cross-sectional shape that can efficiently insert and heat a copper wire or the like in a spirally wound coil to efficiently heat it. . Therefore, induction heating is frequently used for heating a steel pipe, which is particularly true in recent years in which the need for improving work efficiency is increasing.

[0003] Typical applications of induction heating include heat treatment for improving the quality of the steel pipe and heating for bonding the resin coating to the base steel pipe when coating the inner and outer surfaces of the steel pipe with an anticorrosive resin coating. Can be exemplified. However, in the former case, the single pipe is heated at the factory, but in the latter case, the heating is applied to the uncovered portion near the weld existing in the middle of the welded pipeline. In many cases, in this case, since the loose fit of the coil from the pipe end does not remain, the coil segment divided into two so as to have a split surface in the axial direction is applied from the side of the pipe and combined and mounted. As the device type of the segment, usually, (1) a type in which two parts are applied as they are and two sides are fastened to each other, and (2) one side of the two parts is previously set in advance. One of the methods of applying the hinged connection and fastening the remaining one side is adopted.

In either of the above-mentioned forms (1) and (2), the original shape of a spirally connected coil (hereinafter, referred to as a coil)
In order to restore the “original shape”), it is necessary to connect the ends of both sides of the circuit conductors in a number corresponding to the number of turns of the coils arranged in the two segments by abutting each other. By the way, in many cases, a cooling water passage for cooling is formed in the coil to flow cooling water. In this case, when the segments are combined, it is necessary to connect the ends of the conductors of the circuit conductors and electrically connect them together, and also to connect the cooling water passages. In order to prevent leakage, it is necessary to provide an appropriate sealing mechanism and to perform a careful connection operation. For this reason, it takes time and effort to unite the two segments, especially when the number of coil turns is large, the number of connection points between the ends of the circuit conductor increases,
It takes more trouble. For the hinge connection side of the hinge connection method of the above (2), the cooling water channel can be connected in advance by a flexible hose by a bypass, but the other side is also connected to the ends of the circuit conductors. Must be electrically connected and the cooling water channel must also be connected, which also involves a large load in both equipment technology and work.

[0005] The coating work on the middle part of the pipeline is usually performed in a narrow space such as in an excavation trench, so that the above-mentioned complicated connection work becomes more difficult. That is, there is a problem that the advantage of the induction heating that the heating operation can be made more efficient is greatly reduced in terms of the installation of the apparatus.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is a water-cooled induction heating system of a two-segment combined type, which is required for induction heating of an intermediate portion of a pipeline. It is an object of the present invention to provide a technology that can greatly reduce the labor required for mounting a coil.

[0007]

SUMMARY OF THE INVENTION In order to simplify the mounting operation of a water-cooled induction heating coil of a two-segment combined segment type, the present invention provides a cooling water channel provided in a conductor in the segment in each segment. Are configured such that a water passage is formed in such a manner that water can be passed in an unfastened state before the two segments are combined. With this configuration, the water channel connection work at the time of segment merging is simply performed at the water supply / drainage end, and the labor required when mounting the coil can be greatly reduced.

[0008] In the configuration of the present invention, a bypass circuit is inevitably formed by cooling water between circuit conductors having mutually different potentials. However, copper and the like used for the conductor and fresh water have a specific resistance of about 10 ^9. , The bypass current is at most one millionth of the normal current even if the size factor is included,
Leak problems can be ignored. The present invention takes advantage of this point.

[0009] The cooling channel of the induction heating coil is
Usually, a hollow portion such as a copper pipe used for the conductor is used. However, for example, a tubular cooling water passage may be provided on a plate-like conductor.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIGS. 1A and 1B show a segment united induction heating coil (hereinafter abbreviated as a coil) according to a first embodiment of the present invention. FIG. 1A shows a state in which segments are united, and FIG. FIG. 2 is a schematic front view of the coil shown in a detached state. A coil generally designated by reference numeral 1 divides an electric circuit conductor 3 constituting a spiral electric circuit having a plurality of windings (three windings in the drawing) into two parts so as to have a division surface in an axial direction. And the segments 2 and 2 are connected in an integral structure. As long as the conductor 3 constituting the electric circuit has conductivity and a cooling water path, its shape, material and the like are arbitrary. In the present embodiment, a copper pipe is used. Plate-shaped connection terminals 5 are provided at both ends (each two sides of the segments 2 and 2) of each of the circuit conductors 3, and the connection terminals 5 of the circuit conductors 3 of the two segments 2 and 2 facing each other are provided. 5 and 5 are fastened together by bolts 6 to form a spirally connected electric path.
The connection terminal 5 is attached so as to shield the cooling water channel of the electric circuit conductor 3, and therefore,
When the ends of the cooling water passages are connected to each other via the connection terminals 5 and 5, the cooling water passages are not connected to each other. No problem arises.

The electric circuit conductor 3 is provided with connecting members 7a and 7b which form a current supply terminal and a water supply / drain end so as to be located near both ends of a spiral electric circuit formed by the entire electric circuit conductor 3. In the vicinity of both ends of each circuit conductor 3, that is, in the vicinity of the joint at the time of joining the segments 2 and 2, there is provided a water supply / drainage connection tool 8 except for the portions where the connection tools 7 a and 7 b are provided. FIG. 3A is a schematic view showing the coil 1 shown in FIG. In the drawing, the two-dot chain line a indicates the electrical connection relationship between the connection terminals 5 and 5 when the segments 2 and 2 are combined, and the broken line b indicates the flow of the cooling water. As shown in FIG. 3 (a), in each segment 2, the connecting members 8, 8 located at adjacent positions are connected by a hose 10 made of an insulating material, thereby cooling the electric circuit conductor 3 of each segment 2. The water passages are knitted in such a manner that all the cooling water passages are connected in series by a mechanism that is folded back to another cooling water passage via a bypass passage formed by the hose 10. Therefore, in each segment 2, all of the cooling water channels provided in each of the electric circuit conductors 3 are knitted into a water flow path that allows water to flow in series in an unfastened state before the two segments are combined. ing. Further, each of the fittings 8 and 8 (one of which is a drain end and the other is a water supply end) located at the end of the water passage that connects all the cooling water passages in series with each of the two segments 2 and 2 is insulated. They are connected by a flexible hose 11 made of a material. This hose 11
It has a length and flexibility that do not hinder the operation of opening and closing the two segments 2 and 2 for attaching and detaching them to and from the object to be heated from the side.

In order to mount the segment united coil 1 having the above structure on the object to be heated 15 (see FIG. 2), the two segments 2 and 2 are opened, and the object to be heated 1 is opened from the side of the object to be heated 15.
5, and the connection terminals 5, 5 on two sides facing each other of the segments 2, 2 are butted together and fastened by bolts 6. Thereby, the plurality of electric circuit conductors 3 are spirally connected to form a spiral electric circuit. Next, a supply / discharge line (not shown) for supplying current / supply / drain from a power source is connected to the connectors 7a and 7b forming the supply terminal / supply / drain end. Through the above operation, the spiral electric circuit is formed by the plurality of electric circuit conductors 3, the power supply connection to the electric circuit is completed, and the preparation of the plurality of electric circuit conductors 3 to the cooling water path is completed. Thereafter, by supplying electricity to and draining from the connectors 7a and 7b, electricity can be supplied while cooling the plurality of circuit conductors 3, and the object 15 to be heated can be induction-heated.

As described above, the coil 1 shown in FIGS.
Can be attached to the object to be heated 15 from the side of the object to be heated 15, and in order to combine the two segments 2, 2, the connection terminals 5, 5 facing each other are simply fastened by abutting each other, The cooling water passages formed in the conductors 3 need not be connected. This allows
Attachment of the coil 1 to the object to be heated 15 can be performed with a simple operation and in a narrow place. In the above-described embodiment, the supply and drain ends of the two segments 2 and 2 are connected to the hose 1 in advance.
1, the hose 11 may be connected after the two segments 2 and 2 are attached to the object 15 to be heated. However, it is preferable to attach the hose 11 in advance because the number of work steps in a narrow place is reduced.

In the above embodiment, the connecting members 7a, 7b
Functions as a current-carrying terminal and a water supply / drainage end, but the present invention is not limited to this configuration, and the current-carrying terminal and the water supply / drainage end may be configured using different connectors. FIG. 3 (b) shows an embodiment in that case, in which the connectors 7A and 7B attached near the ends of the circuit conductor 3 are used only for water supply and drainage, and a power supply is connected to the end of the circuit conductor 3. Connection terminals 5A and 5B are attached. A hose 11A for connecting the water passages of the two segments 2 and 2 connects the connecting tools 8 and 8 near the connecting terminals 5 and 5 to be electrically connected to each other. Also in this embodiment, in order to mount the coil 1 on the object to be heated, the connection terminals 5 and 5 facing each other of the two segments 2 and 2 only have to be fastened by abutting each other and electrically conducting. A spiral electric circuit can be formed by all the electric circuit conductors 3, and the connecting members 7A to 7B
A water flow path can be formed in which the cooling water paths of all the electric circuit conductors 3 flow in series.

In the above embodiment, the cooling water passages of all the electric conductors 3 are configured to form the water passages through which the cooling water flows in series. However, the water passages are not limited to this structure. Any shape may be used as long as water can be passed through all of the provided cooling water channels in an unfastened state before the two divided segments 2 and 2 are combined. FIG. 4 shows an embodiment in which the cooling water channels of all the electric circuit conductors 3 in each segment 2 are configured such that the cooling water flows in parallel. That is, in this embodiment, the branch pipes 20, 2 made of an insulating material for branching and supplying or draining the cooling water near each of the two sides of each segment 2 are provided.
1 and their branch pipes 20, 21 are connected to the respective conductors 3
Is connected to the water connection connector 8 provided by the hose 22 by a hose, whereby the cooling water passages of all the electric circuit conductors 3 in each segment 2 are connected from the vicinity of one fastening seam when the segments 2 and 2 are combined. It is knitted in such a way that parallel water flows toward the vicinity of the other joint seam with the seam behind. A branch pipe 21 serving as a drain end of one segment 2 is connected to a branch pipe 20 serving as a water supply end of the other segment 2 by a flexible hose 23 made of an insulating material. Also in this embodiment, in order to mount the coil 1 on the object to be heated, the facing connection terminals 5 and 5 of the two segments 2 and 2 only need to be fastened to each other to make them electrically conductive.
Thus, a spiral electric circuit can be formed by all the electric circuit conductors 3, and a cooling water path of the all electric circuit conductors 3 can be formed in parallel in each segment 2, and a water flow path can be formed in series between the segments 2 and 2. .

The branch pipes 20, 21 in the embodiment of FIG.
Any structure can be used as long as it can be connected to the connector 8 formed at the end of the plurality of circuit conductors 3. For example, a straight pipe having a plurality of branch pipes can be used. .

In the embodiment described above, the means (hoses, branch pipes, etc.) for connecting the cooling water passages of the electric circuit conductors 3 in each segment 2 are connected to the connection terminals 5 provided at the ends of the electric circuit conductors 3. Although it is a completely different member, the present invention is not limited to this configuration, and a member used for connection of the cooling water channel is integrated with a group of connection terminals at the end of the electric circuit conductor 3 to form a composite terminal, and A configuration is also possible in which a water channel is formed in the connection terminal and used for cooling water channel connection. Hereinafter, an embodiment in that case will be described with reference to FIGS. In the embodiment shown in FIGS. 5 to 10, a composite terminal 31 (see FIGS. 5 to 8) and a composite terminal 32 (see FIGS. 9 and 10) are provided on two sides for fastening the two segments 2 and 2, respectively. Have been.

In FIG. 5 to FIG. 8, the composite terminal 31 is a square rod-shaped connection terminal 34 connected to the end of each circuit conductor 3.
Is arranged so as to cover all the connection terminals 34,
And a plate-shaped water supply or drainage head 35 made of an insulating material fixed to the connection terminal 34 with an adhesive or the like, and a current supply terminal / water supply / drainage connection device 3 connected to the head 35.
6a (or 36b) and its connector 36a (or 36b).
A conductive plate 37 and the like for conducting b) to the connection terminal 34 disposed at one end are provided. As can be clearly understood from FIG. 8, each connection terminal 34 is formed with a water passage 39 communicating with the cooling water passage of the electric circuit conductor 3, and the water passage 39 is connected to the head 3.
5, and a seal member 40 such as an O-ring is arranged around the opening. On the other hand, the head 35 is provided with a water supply channel 41 communicating with the connecting member 36a (or 36b) inside the head 35, and the water supply channel 41 is connected to each connection terminal 3
4 is open at a position facing the opening of the water passage 39. Thus, the connection tool 36 a (or 36 b) communicates with the cooling water passage of each electric circuit conductor 3 via the water passage 41 of the head 35 and the water passage 39 of the connection terminal 34. FIG. 8A,
In (b), reference numeral 42 denotes a spacer arranged at a position facing the connection terminal 34 connected to the connection tool 36a or 36b via the conductive plate 37.

9 and 10, the composite terminal 32 is
Similar to the composite terminal 31 shown in FIGS. 5 to 8, a square rod-shaped connection terminal 34 connected to the end of each of the circuit conductors 3, and arranged so as to cover all the connection terminals 34, and the connection terminals 34 And a plate-like water supply or drainage head 35A made of an insulating material fixed by an adhesive or the like. The connection terminal 34 has the same structure as the connection terminal 34 shown in FIG. 8, and has a water passage inside. The head 35A has a connector 44 constituting a water supply end or a drain end near one end thereof, and a water passage communicating with a water passage of each connection terminal 34 inside the head 35A, similarly to the head 35 shown in FIG. It has. The connecting members 44 provided on the composite terminals 32 fastened to each other are connected by a flexible hose 46 made of an insulating material. With the above configuration,
In each of the two segments 2, 2, the cooling water passages of all the electric circuit conductors 3 are in a state in which water can be passed in parallel in a state before the two segments 2, 2 are fastened to each other as in the case shown in FIG. 4. And the drain end of each water passage of the two segments 2 and 2 (connector 44)
The water supply end (connector 44) is connected by a hose 46.

In the coil 1 provided with the composite terminals 31 and 32 having the above-described structure, when the coil is attached to the object to be heated, the two segments 2 and 2 are opened, and the object to be heated is opened from the side of the object to be heated. Put on. Then, the composite terminals 31, 31 and 32, 32 located on the two sides facing each other are brought into contact with each other as shown in FIGS. 5 to 10, and a pair of heads 35, 35 and 35A, 35A are moved to the outside. Then, it is tightened with an appropriate fastener (for example, a giant clam). As a result, the connection terminals 34 of the two segments 2, 2 facing each other can be fastened by abutting each other and electrically connected. After that, composite terminal 3
Wiring (not shown) for power supply and water supply and drainage from a power supply is connected to the connection terminals 36a and 36b for power supply terminals and water supply and drainage attached to the power supply terminals 1 and 31. Through the above operation, an electric circuit in which the plurality of electric circuit conductors 3 are spirally connected is formed, power supply connection to the electric circuit is completed, and preparation of water supply of the plurality of electric circuit conductors 3 to the cooling water path is completed. Thus, also in this embodiment, the composite terminals 31 and 31 and the composite terminal 3
The coil 1 can be mounted on the object to be heated by a simple operation of butting the two and 32 together and tightening them with the fasteners in one operation, and work in a narrow place can be easily performed.

In the above embodiment, the composite terminal 3
A method is adopted in which 1, 31 comrades and the composite terminals 32, 32 are butted together and fastened with a fastener such as a shank, but the means for fastening the butted composite terminals are not limited to shakuman and the like. Or use bolt joints,
Other arbitrary methods may be adopted.

In the embodiment shown in FIGS. 5 to 10, the cooling water passages of the electric circuit conductors 3 are connected in parallel by the water passages formed in the heads 35 and 35A. By changing the arrangement of the formed water passages, the cooling water passages of the electric circuit conductors 3 can be connected in series as shown in FIG. 3, and may be changed as such.

Further, in each of the embodiments described above, the two segments 2, 2 constituting the coil are fastened at two sides facing each other. May be connected by a hinge, and only the other side is fastened.
In that case, the hoses 11, 11A, 24, 46 for connecting the cooling water passages of the two segments 2, 2 may be arranged on the side where the hinge is arranged.

[0024]

As described above, according to the present invention, the electric conductor constituting the spiral electric circuit having a plurality of turns is formed into two divided segments, so that the object to be heated can be easily formed from the side. In addition to being detachable, all the cooling water passages provided in the conductors in each segment are formed with water passages in a form that allows water to pass through in an unfastened state before the two divided segments are united. At the time of merging, only the water supply / drainage end of each segment is required for the connection of the water channel, which can greatly reduce the time required for coil installation, can be easily installed in narrow places, and can easily install existing pipes in narrow places. This also has an effect that induction heating can be easily performed.

[Brief description of the drawings]

1A and 1B show a coil according to a first embodiment of the present invention, wherein FIG. 1A is a schematic side view showing a state where segments are combined, and FIG. 1B is a schematic side view showing a state where segments are separated.

FIG. 2 is a schematic front view of the coil shown in FIG.

3A is a schematic view showing the coil shown in FIG. 1 in an unfolded state. FIG. 3B is a schematic view showing the coil in a modified example unfolded.

FIG. 4 is a schematic view showing a developed coil according to another embodiment of the present invention.

FIG. 5 is a schematic side view showing a composite terminal 31 side of a coil according to still another embodiment of the present invention.

6 is a schematic front view of the composite terminal 31 of the coil shown in FIG.

FIG. 7 is a schematic plan view of the portion shown in FIG. 6;

8A is a schematic sectional view taken along the line AA of FIG. 7; FIG. 8B is a schematic sectional view taken along the line BB of FIG. 7;

FIG. 9 is a schematic side view showing the composite terminal 32 side of the coil shown in FIG. 5;

10 is a schematic front view of the composite terminal 32 of the coil shown in FIG. 9;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 segment united induction heating coil 2 segment 3 circuit conductor 4 connecting member 5 connecting terminal 6 bolt 7 connecting tool 8 connecting tool 10, 11 hose 15 object to be heated 20, 21 head 22 hose 31, 32 composite terminal 34 connecting terminal 35, 35A head 36 connector 37 conductive plate 39, 41 water passage 40 sealant 42 spacer 44 connector

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Morio Iwamoto 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa F-term in Dai-ichi High Frequency Industry Co., Ltd. 3K059 AA08 AB09 AB19 AB23 AB28 AD40 CD48 CD63 CD64 CD72 CD75 CD79

Claims (5)

[Claims] An electric circuit conductor constituting a helical electric circuit having a plurality of turns is divided into two segments having an axial division surface, and the two divided segments are fastened together by two sides thereof. Or a water-cooled induction heating coil which is hinged at one side and fastened and joined together by the other side so that it can be attached to the object to be heated from the side. By arranging the water passages in all the cooling water passages in such a manner that water can be passed in an unfastened state before the two divided segments are combined, the connection of the water passages at the time of segment combination is performed by supply / drainage. A segment united induction heating coil, characterized in that only an end is required. 2. The cooling water passage of one circuit conductor is folded back to the cooling water passage of another circuit conductor via an insulating bypass water passage in the vicinity of a fastening joint at the time of the segment merging. 2. The segment combined type induction heating coil according to claim 1, wherein the cooling water passages are knitted in series. 3. The parallel water flow through the cooling water passage of the plurality of electric conductors from the vicinity of one joint seam at the time of the segment merging to the vicinity of another joint seam with the seam as a back. The combined segment induction heating coil according to claim 1, which is knitted in a shape. 4. A knitting of a group of connection terminals of said circuit conductor for each side provided for fastening of said segment into an integrated composite terminal which is integrated with a water supply or drainage head made of an integral insulating material. By connecting the water supply end or drain end of the cooling water passage to the head, connection of the coil at the time of fastening is
4. The segment united induction heating coil according to any one of claims 1 to 3, wherein the operation can be performed only by overlapping a pair of composite terminals to be connected and sandwiching them with a fastener. 5. A flexible hose made of an insulating material which connects a drain end of a water passage formed in one segment to a water supply end of a water passage formed in the other segment. 5. The segment-integrated induction heating coil according to any one of 4.