JP2614167B2 - Induction heating coil and method of manufacturing induction heating coil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an induction heating coil and a method for manufacturing the induction heating coil.

[0002]

2. Description of the Related Art A conventional technique will be described below with reference to the drawings. 9 and 10 are views for explaining an example of a conventional induction heating coil and a method for manufacturing the induction heating coil. FIG. 9 is a schematic perspective view of the conventional induction heating coil, and FIG. It is a perspective view of a part of induction heating coil.

As shown in FIG. 9, an induction heating coil 200 taken as an example is a so-called semi-open saddle type induction heating coil suitable for heating the peripheral surface of a cylindrical work, and has a pair of leads. Conductors 201 and 202 and these lead conductors
One pair of one end connected to one end of 201, 202
Heating conductors 203, 204 arranged symmetrically in an arc; a pair of linear and parallel heating conductors 205, 206 having one ends connected to the other ends of the heating conductors 203, 204;
, 206 are connected between the other ends of the heating conductors 207 having a substantially half-arc shape. Each of the lead conductor and the heating conductor is formed of a square tube made of a good conductive metal.

[0004] 211 to 216 are lead conductors 201, respectively.
And the heating conductor 203, the lead conductor 202 and the heating conductor 204, the heating conductors 203 and 205, the heating conductors 204 and 206, and the heating conductor 205
207 is a connection portion between the heating conductors 206 and 207.

[0005] As shown in FIG. 10, a lead conductor 201 and a heating conductor 203 are butted at a connecting portion 211,
The heating conductor 203 is connected and fixed by brazing 211a so that it is bent from the lead conductor 201. Similarly, the heating conductor 203 and the heating conductor 205 abut at the connection portion 213 and are connected and fixed by brazing 213a such that the heating conductor 205 is bent from the heating conductor 203. In the other connecting portions 212, 214 to 216, the conductors are similarly butted, and the butted portions are connected by brazing.

[0006]

The induction heating coil manufactured as described above has the following problems. The lead conductor and the heating conductor, and the heating conductor and the heating conductor are connected to each other by butting and brazing, so that when the induction heating coil is repeatedly energized, the conductor expands and contracts due to the energization. The brazing portion may come off, and the cooling fluid flowing through the rectangular tube constituting the conductor may leak. That is, there is a problem that the life of the induction heating coil is short.

The present invention has been made in view of the above circumstances, and has as its object to solve the above-mentioned drawbacks.
Proposed a new induction heating coil and a method of manufacturing the induction heating coil.
To provide.

[0008] In order to solve the above-mentioned problem, an invitation according to the present invention is provided.
The induction heating coil has the following configuration.

That is, induction heating having a bent portion
In the coil, the part corresponding to the bent part
Connected to a curved connection conductor and the end of the connection conductor
It is composed of a coil conductor and the end of the connection conductor.
Peripheral surface and peripheral surface of coil conductor end or connection conductor end
Connection conductor on the outer peripheral surface of the
A step is formed to fit the ends with the coil conductor
That the mating part is brazed.
Features.

[0010] In order to solve the above-mentioned problem, an invitation according to the present invention is provided.
The manufacturing method of the induction heating coil has the following configuration.
You.

That is, induction heating having a bent portion
In the method of manufacturing the coil, the bent portion is
Curved connection conductor as a barrel part and the end of the connection conductor
Create the coil conductor to be connected to the
The ends of the coil conductor are fitted together, and the fitting
To connect the connection conductor and the coil conductor.
It is characterized by the fact that it has been done.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an induction heating coil according to an embodiment of the present invention; 1 to 5 are drawings for explaining a first embodiment, FIG. 1 is a vertical sectional front view of a connection portion of an induction heating coil, FIG. 2 is an exploded vertical sectional view, and FIG. 3 is an exploded perspective view. 4 is an enlarged view of a part of the connecting portion shown in FIG. 1, and FIG. 5 is a perspective view of the induction heating coil.

As shown in FIG. 5, an induction heating coil 100 according to the present embodiment is a so-called semi-open saddle type induction heating coil suitable for heating the peripheral surface of a cylindrical work, for example.
A pair of lead conductors 101 and 102 and lead conductors 101 and 102
Are connected to one end via a pair of connection conductors 103 and 104 which are bent at an angle of about 90 ° and are symmetrically arranged, respectively, and are symmetrical in a pair of substantially 1/4 arc shapes. At the other end of the heating conductors 105 and 106, and at one end via a pair of connection conductors 107 and 108 which are bent at an angle of approximately 90 ° and arranged symmetrically, respectively. Are connected to a pair of linear and parallel heating conductors 109 and 110, and a pair of heating conductors 109 and 110, each of which is bent at an angle of approximately 90 ° and arranged symmetrically. Connecting conductors 111, 11
2 heating conductor 113 connected through
And Each of the lead conductor, the heating conductor, and the connection conductor is formed of a square cylinder made of a good conductive metal having the same diameter.

Next, a state in which the lead conductor 101 (first conductor) and the heating conductor 105 (second conductor) are connected and fixed via the connection conductor 103 will be described. As shown in FIG. 1, a step (third step) formed on the outer peripheral surface of the end of the lead conductor 101
The lead conductor 101 and the connection conductor 103 are connected to the connection conductor 103 such that a step (first step) 103a formed on the inner peripheral surface of one end of the connection conductor 103 so as to correspond to the step 101a is fitted. . The length L of the steps 101a and 103a is the length of the lead conductor.
It is preferable that the length is at least approximately the same as the thickness T of the heating conductor 101 or the heating conductor 105, and is generally about three times or more.

Further, a step (second step) 103b formed on the inner peripheral surface of the other end of the connection conductor 103 and a step formed on the outer peripheral surface of one end of the heating conductor 105 so as to correspond to the step 103b. The connection conductor 103 and the heating conductor 105 are connected so that the (fourth step) 105a is fitted. And step 101a
The fitting portion with 103a and the fitting portion with steps 103b and 105a are brazed so that lead conductor 101 is connected to connection conductor 103.
And the heating conductor 105 are fixed.

Next, a method of manufacturing such a connection portion of the induction heating coil 100 will be described. As shown in FIGS. 2 and 3, after the connection conductor 103 is formed into a shape having a predetermined angle, the connection conductor 103 is pressed, cast, discharged, or formed on the inner peripheral surface of one end and the other end. Steps 103a and 103b are respectively formed by machining or the like. Also,
On the outer peripheral surfaces of the ends of the lead conductor 101 and the heating conductor 105,
Steps 101a and 105a are formed by press working, casting, electric discharge machining, machining, or the like so that the steps 101a and 105a can be fitted to the steps 103a and 103b, respectively.

Then, an end of the lead conductor 101 is connected to a connection conductor.
103 and facing the heating conductor 105
Is disposed so as to face the other end of the connection conductor 103, and the lead conductor 101 and the heating conductor 105 are moved in the directions of arrows P and Q, respectively, so that the steps 103a and 103b respectively correspond to the steps 101a and 105b. Is fitted.

Thereafter, the end of the lead conductor 101, the connecting conductor
After one end and the other end of the heating element 103 and the end of the heating conductor 105 are heated by a burner until they turn red, the material rod 120 for brazing is connected, for example, as shown in FIG.
When the material rod 120 is melted by being brought into contact with the entrance of a very small gap 121 at the connection portion between the heating conductor 105 and the heating conductor 105, the melted brazing material is filled with the gap 121, and the connection conductor 103 and the heating conductor 105.
After cooling into the gap 122 of the fitting portion of the connection conductor 1
03 and the heating conductor 105 are bonded and fixed.

Connection conductor of the induction heating coil 100 shown in FIG.
The connection between the lead conductor 102 and the heating conductor 106 by 104, the connection between the heating conductors 105 and 109 by the connection conductor 107, the connection between the heating conductors 106 and 110 by the connection conductor 108, the connection conductor 11
1 connection between heating conductors 109 and 113, and connection conductor 1
The connection between the heating conductors 110 and 113 by the connection 12 is performed in the same manner as the connection between the lead conductor 101 and the heating conductor 105 by the connection conductor 103 as described above.

As described above, the connecting portion between the lead conductor and the heating conductor of the induction heating coil 100 and the connection portion between the heating conductors are butt-butted like the connection portion of the conventional induction heating coil. Instead, the steps formed on the outer peripheral surfaces of the ends of both conductors to be connected are fitted to the steps formed on the inner peripheral surfaces of one end and the other end of the connection conductor bent at a predetermined angle, respectively. In addition, the fitting portion is brazed.

Therefore, even when the conductor is expanded and contracted by repeatedly applying current to the induction heating coil 100, the brazed portion is very unlikely to come off, so that the coolant does not leak from the brazed portion.

Next, a method of manufacturing the induction heating coil according to the second embodiment will be described. In the first embodiment, the conductors connected by the connection conductors, for example, the lead conductor 101 and the heating conductor 105 connected by the connection conductor 103 are different from each other in the steps 101a and 101a formed on the outer peripheral surface of the end of the lead conductor 101. The steps 103a and 103b formed on the inner peripheral surfaces of one end and the other end of the connection conductor 103 are fitted to the steps 105a formed on the outer peripheral surface of the end of the heating conductor 105, respectively. In the induction heating coil according to the second embodiment, for example, the connection between the lead conductor 101 and the heating conductor 105 by the connection conductor 103 is performed as shown in FIG. Step 101b formed in
The step 103c and the step 103d formed on the outer peripheral surfaces of both ends of the connection conductor 103 are fitted to the step 105b.

Further, a method of manufacturing the induction heating coil according to the third embodiment will be described. In the induction heating coil of the third embodiment, for example, a connecting conductor between the lead conductor 101 and the heating conductor 105
As shown in FIG. 7, the connection by the connection 103 is performed by steps 103 c and 103 b formed on the outer peripheral surface of one end of the connection conductor 103 and the inner peripheral surface of the other end of the connection conductor 103, respectively. Step 101b formed on the surface and heating conductor 105
Steps 105a formed on the outer peripheral surface of the end portions are fitted respectively.

The induction heating coil of the third embodiment is, for example, an induction heating coil 150 shown in FIG.
0 and the same outer shape). That is, the connection conductor 115 of the induction heating coil 150 is
101 and the heating conductor 109
100 connecting conductors 103, heating conductors 105, and connecting conductors 10
The connection conductor 115 is connected to the lead conductor 101 by connecting a step (not shown) formed on the outer circumference of one end of the connection conductor 115 and the inner circumference of the end of the lead conductor. The not-shown step is fitted.
Further, a step (not shown) formed on the inner peripheral surface of the other end of the connection conductor 115 and a step (not shown) formed on the outer peripheral surface of the end of the heating conductor 109 are fitted. The connection between the lead conductor 102 and the heating conductor 110 by the connection conductor 116 is the same as that of the connection conductor 115.

When manufacturing one induction heating coil, the above-described various connection methods can be appropriately adopted as the connection method of the conductor according to the connection place.

As described above , the induction heating coil according to the present invention and
And the method of manufacturing the induction heating coil,
Since the connection with the il conductor is strong,
Even if the conductor expands and contracts due to repeated energization
The connection between the connection conductor and the coil conductor
No.

Further , the induction heating coil is bent.
The magnetic flux does not easily concentrate on the
Compared to the case of the example, the progress of electrical degradation in this part
You can slow down the execution. Because two
When the ends of the conductor are simply joined together by brazing
In the case of the conventional example, there is an angular part, and this part
Magnetic flux is easily concentrated in
If the magnetic flux is likely to concentrate, use a curved connecting conductor
Because it has been devised to eliminate the angular part
It is.

Therefore, the life of the induction heating coil is prolonged.
be able to.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a connection portion of an induction heating coil according to a first embodiment of the present invention.

FIG. 2 is an exploded vertical sectional front view of a connection portion of an induction heating coil.

FIG. 3 is an exploded perspective view of a connection portion of the induction heating coil.

FIG. 4 is an enlarged longitudinal sectional front view of a part of a connection portion of an induction heating coil.

FIG. 5 is a perspective view of an induction heating coil.

FIG. 6 is a longitudinal sectional front view of a connection portion of an induction heating coil according to a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional front view of a connection portion of an induction heating coil according to a third embodiment of the present invention.

FIG. 8 is a perspective view of an induction heating coil for explaining a third embodiment of the present invention.

FIG. 9 is a schematic perspective view of a conventional induction heating coil.

FIG. 10 is a perspective view of a part of a conventional induction heating coil.

[Explanation of symbols]

100 Induction heating coil 101, 102 Lead conductor 103, 104, 107, 108, 111, 112, 115, 116 Connection conductor 105, 106, 109, 110, 113 Heating conductor 101a, 103a, 103b, 105a Step

Claims (2)

(57) [Claims] 1. An induction heating coil having a bent portion.
The part corresponding to the bent part
A curved connection conductor and a coil connected to the end of the connection conductor
Inner conductor at the end of the connection conductor.
And the outer peripheral surface of the end of the coil conductor or the end of the connection conductor
Connect the connection conductor and coil to the peripheral surface and the inner peripheral surface at the end of the coil conductor.
A step is formed to fit the ends of the
An induction heating coil , wherein the fitting portion is brazed. 2. An induction heating coil having a bent portion.
In the method of manufacturing the bent part
Connect the curved connection conductor that is a part to the end of the connection conductor.
The coil conductor to be connected is created separately, and the connection conductor and coil
The ends of the conductors are fitted together, and the fittings are brazed.
So that the connection conductor and the coil conductor are joined together.
A method for producing an induction heating coil, characterized in that: