JP6832312B2 - Induction heating coil - Google Patents

Description

The present invention relates to an induction heating coil. More specifically, the present invention relates to an induction heating coil capable of uniformly heating an object to be heated.

Conventionally, as an induction heating coil used when an object to be heated is inserted into an induction heating coil and induced heating such as brazing work by induction heating, a so-called saddle type induction heating coil (note that "saddle" is used. The "type induction heating coil" is also referred to as a "hairpin type induction heating coil").

Here, when the object to be heated is induced and heated using the conventional saddle-shaped induction heating coil, as shown in FIG. 1, in the front end region A of the saddle-shaped induction heating coil 200 connected to the high-frequency current source 100. A case where the cylindrical object to be heated 300 is induced and heated will be examined.

In this case, a looping induced current is generated in the peripheral surface extending along the axial direction of the object to be heated 300 facing the upper coil 200a and the lower coil 200b of the saddle-shaped induction heating coil 200, respectively. The object to be heated 300 can be induced and heated.

On the other hand, since the induced currents in the directions canceling each other flow from the upper coil 200a and the lower coil 200b of the saddle-shaped induction heating coil 200 on the left and right side surfaces of the object to be heated 300, the object to be heated 300 is directly connected. It is not induced and heated.

That is, as shown in FIG. 1, when the object to be heated 300 is induced to be heated in the front end region A of the saddle-shaped induction heating coil 200, the peripheral surface portion extending along the axial direction of the object to be heated 300 is directly However, on the other hand, since the left and right side surfaces of the object to be heated 300 are not directly induced to be heated, there is a problem that the heating distribution in the cross-sectional direction of the object to be heated 300 is not uniform.

Next, when the object to be heated is induced and heated using the conventional saddle-shaped induction heating coil, as shown in FIG. 2, in the pocket region B of the saddle-shaped induction heating coil 200 connected to the high-frequency current source 100. A case where the object to be heated 300 is induced to be heated will be examined.

In this case, since the induced currents facing each other flow at the left and right side ends of the object to be heated 300, the central portion of the object to be heated 300 is not directly induced and heated.

Therefore, as shown in FIG. 2, even when the object to be heated 300 is induced to be heated in the pocket region B of the saddle-shaped induction heating coil 200, there is a problem that the heating distribution of the object to be heated 300 is not uniform. there were.

When trying to make the heating distribution of the object to be heated uniform by using the conventional saddle-type induction heating coil described above, the saddle-type induction heating is performed because the object to be heated is rotated with respect to the saddle-type induction heating coil. It is necessary to provide a configuration for relatively moving the positional relationship between the coil and the object to be heated and perform the moving work, which causes a new problem that the configuration and the work become complicated.

Since the prior art that the applicant of the present application knows at the time of filing the patent application is not an invention related to a document known invention, there is no prior art document information to be described in the specification of the present application.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is that an object to be heated can be inserted into an induction heating coil for induction heating. At the same time, it is intended to provide an induction heating coil capable of uniformly inducing and heating an object to be heated so that the heating distribution becomes uniform.

In order to achieve the above object, the present invention arranges a first induction heating coil portion and a second induction heating coil portion in which a high frequency current flows in the same direction at intervals at which an object to be heated can be arranged. It was made like this.

Therefore, according to the present invention, by arranging the object to be heated between the first induction heating coil portion and the second induction heating coil portion in which the high frequency current flows in the same direction, the circumference of the cross section of the object to be heated Since an induced current that rotates uniformly in the same direction can be passed, the object to be heated can be heated uniformly to make the heating distribution uniform.

Further, according to the present invention, since there is a space between the first induction heating coil portion and the second induction heating coil portion where the object to be heated can be arranged, the first induction heating coil portion and the first induction heating coil portion. An object to be heated can be inserted and arranged between the second induction heating coil portion and the portion to be heated.

Further, according to the present invention, the heated object can be uniformly heated without relatively moving the positional relationship between the induction heating coil and the object to be heated, so that the heating distribution can be made uniform. It is simple and easy to work with.

That is, in the present invention, in an induction heating coil that heats an object to be heated by induction heating, a first induction heating coil portion and a second induction heating coil portion are arranged at intervals at which the object to be heated can be arranged. The first induction heating coil portion and the second induction heating coil portion each have a spiral shape, and the extension direction of the spiral shape in the first induction heating coil portion and the second induction heating portion are provided. The first induction by arranging the object to be heated between the coil portion and the extension direction of the spiral shape and energizing the first induction heating coil portion and the second induction heating coil portion. The induction current flows in the same direction along the peripheral surface of the object to be heated by the high-frequency current flowing through the heating coil portion and the second induction heating coil portion .

Further, in the present invention described above, the first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in the same winding direction. ..

Further, in the present invention, the first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in opposite winding directions in the present invention. is there.

Further, in the present invention described above, the present invention relates to one end of the first induction heating coil portion in the extension direction of the spiral shape and the second induction heating coil portion in the extension direction of the spiral shape. The other end on the opposite side to the one end is connected, and the other end and the second induction heating coil portion in the spiral shape of the first induction heating coil portion are connected to each other. The one-sided end of the spiral shape is connected to a high-frequency current source that conducts a high-frequency current to the first induction heating coil portion and the second induction heating coil portion. is there.

Further, in the present invention described above, the present invention relates to one end of the first induction heating coil portion in the extension direction of the spiral shape and the second induction heating coil portion in the extension direction of the spiral shape. The end of the one side is connected, and the end of the other side of the spiral shape of the first induction heating coil portion opposite to the end of the one side and the end of the second induction heating coil portion. The other end portion of the spiral shape is connected to a high-frequency current source that conducts a high-frequency current to the first induction heating coil portion and the second induction heating coil portion.

Further, in the present invention described above, the first induction heating coil portion and the second induction heating coil portion are connected to either the upper side or the lower side.

Further, in the present invention described above, the spiral shape is such that substantially quadrangular regions are continuous in a spiral shape.

Further, in the present invention, in the present invention, the first induction heating coil portion and the second induction heating coil portion are arranged so that the side regions in the substantially square shape of each other face each other. It was made to be.

Further, in the present invention described above, the spiral shape is a normal spiral shape or a parallel winding spiral shape.

Further, in the present invention described above, the magnetic material is arranged on the inner diameter side of the spiral shape.

Since the present invention is configured as described above, it is possible to insert the object to be heated into the induction heating coil for induction heating, and to make the object to be heated uniform so that the heating distribution is uniform. It has an excellent effect of being able to perform induction heating.

FIG. 1 is an explanatory diagram schematically showing a case where the object to be heated is induced and heated in the front end region of the saddle-type induction heating coil when the object to be heated is induced and heated by using a conventional saddle-type induction heating coil. is there. FIG. 2 is an explanatory diagram schematically showing a case where the object to be heated is induced and heated in the pocket region of the saddle-type induction heating coil when the object to be heated is induced and heated by using the conventional saddle-type induction heating coil. is there. FIG. 3 is an explanatory view schematically showing an induction heating coil according to an example of the embodiment of the present invention, and is a view taken along the arrow D of FIG. FIG. 4 is an explanatory view schematically showing an induction heating coil according to an example of the embodiment of the present invention, and is a view taken along the line C of FIG. FIG. 5 is an explanatory view schematically showing an induction heating coil according to another example of the embodiment of the present invention, and is a view taken along the line F of FIG. FIG. 6 is an explanatory view schematically showing an induction heating coil according to another example of the embodiment of the present invention, and is a view taken along the line E of FIG. FIG. 7 is an explanatory view schematically showing an induction heating coil according to another example of the embodiment of the present invention, and is a view taken along the line K of FIG. FIG. 8 is an explanatory view schematically showing an induction heating coil according to another example of the embodiment of the present invention, and is a view taken along the line J of FIG. 7. FIG. 9 is an explanatory view schematically showing an induction heating coil according to another example of the embodiment of the present invention, and is a view taken along the line M of FIG. FIG. 10 is an explanatory view schematically showing an induction heating coil according to another example of the embodiment of the present invention, and is a view taken along the line L of FIG.

Hereinafter, an example of an embodiment of the induction heating coil according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 show explanatory views schematically showing an induction heating coil according to an example of the embodiment of the present invention. FIG. 3 is a view taken along the arrow D in FIG. 4, and FIG. 4 is a view taken along the arrow C in FIG.

The induction heating coil 10 includes a first induction heating coil portion 12 and a second induction heating coil portion 14 connected to a high-frequency current source 30, respectively.

Here, the first induction heating coil portion 12 and the second induction heating coil portion 14 are respectively wound into a spiral shape (solenoid shape), and the first induction heating coil portion 12 and the second induction heating portion 12 are formed. It has substantially the same shape as the coil portion 14.

Specifically, the first induction heating coil portion 12 and the second induction heating coil portion 14 have a substantially quadrangular shape in the XZ plane, and the first induction is such that the side regions in the substantially quadrangular shape face each other. The heating coil portion 12 and the second induction heating coil portion 14 are arranged.

Further, the first induction heating coil portion 12 and the second induction heating coil portion 14 have their respective solenoid axial directions (extension directions) extended in the front-rear direction, and a predetermined gap in the left-right direction on the same plane in the vertical direction. It is arranged with G open.

The first induction heating coil portion 12 and the second induction heating coil portion 14 are wound in a spiral shape (solenoid shape) in the same winding direction in the C arrow view and the D arrow view.

Here, the gap G is set to a size having a margin that allows the object to be heated 20 to be inserted from below between the first induction heating coil portion 12 and the second induction heating coil portion 14.

In this embodiment, the case where the object to be heated 20 has a columnar shape is shown.

Then, in the induction heating coil 10, the front side end portion 12a located on the upper side of one end portion (front side end portion) in the extension direction in the spiral shape of the first induction heating coil portion 12 and the second induction In the spiral shape of the heating coil portion 14, the rear side end portion 14a located on the upper side of the other end portion (rear side end portion) on the opposite side to the one side is electrically connected by the connecting portion 16. ing.

Further, in the induction heating coil 10, the rear side end portion 12b located on the upper side of the other side end portion (rear side end portion) opposite to the one side in the spiral shape of the first induction heating coil portion 12 And the high-frequency current source 30 are electrically connected to each other, and the front end portion 14b located above the one end portion (front side end portion) in the spiral shape of the second induction heating coil portion 14 The high frequency current source 30 is electrically connected.

Therefore, when a high-frequency current is applied to the induction heating coil 10 from the high-frequency current source 30, the first induction heating coil portion 12 and the second induction heating coil portion 14 have high frequencies in the same direction in the C and D arrows. Current flows.

In the above configuration, the object to be heated 20 is inserted between the first induction heating coil unit 12 and the second induction heating coil unit 14 from below, and a high frequency current is applied to the induction heating coil 10 by the high frequency current source 30.

Since the first induction heating coil portion 12 and the second induction heating coil portion 14 are connected on the upper side, the first induction heating coil portion 12 and the second induction heating coil portion 12 can be moved by moving the object to be heated 20 in and out from the lower side. There are no restrictions when arranging the object to be heated 20 in the gap G between the two induction heating coil portions 14.

When a high-frequency current is applied to the induction heating coil 10 by the high-frequency current source 30, a high-frequency current in the same direction flows through the first induction heating coil portion 12 and the second induction heating coil portion 14 in the C and D arrows. The induced current flows uniformly along the peripheral surface of the object to be heated 20 in the same direction.

That is, electromagnetic induction is received from the first induction heating coil portion 12 on the left side and the second induction heating coil portion 14 on the right side, and an induced current flows uniformly along the peripheral surface of the object to be heated 20 in the same direction. ..

That is, in the object to be heated 20, the same induced current flows at any position in the front-rear direction.

Therefore, according to the induction heating coil 10, the object to be heated 20 can be uniformly induced and heated by the induced current flowing through the object to be heated 20.

As described above, according to the induction heating coil 10, the object to be heated 20 can be uniformly induced and heated so that the heating distribution is uniform.

Further, according to the induction heating coil 10, the first induction heating coil portion 12 and the second induction heating coil portion 14 may be provided with a substantially quadrangular shape in the XZ plane. The second induction heating coil portion 14 can be easily manufactured.

Further, according to the induction heating coil 10, the first induction heating coil portion 12 and the second induction heating coil portion 14 are arranged so that the side regions in a substantially square shape of each other face each other, and the second induction heating coil portion 14 is heated between them. Since the object 20 is inserted and electromagnetically induced, the object 20 to be heated can be efficiently heated.

Further, according to the induction heating coil 110, the object to be heated 20 can be uniformly heated and the heating distribution can be made uniform without relatively moving the positional relationship between the induction heating coil 10 and the object to be heated 20. Therefore, the structure is simple and the workability is good.

It should be noted that each of the above-described embodiments is merely an example, and the present invention can be implemented in various other embodiments. That is, the present invention is not limited to the above-described embodiments, and various omissions, replacements, changes, and the like can be made without departing from the gist of the present invention.

For example, each of the above-described embodiments may be modified as shown in (1) to (8) below.

(1) In the above-described embodiment, the first induction heating coil portion 12 and the second induction heating coil portion 14 are wound in a spiral shape (solenoid shape) in the same winding direction in the C arrow view and the D arrow view. I tried to turn it, but of course it is not limited to this. For example, as shown in FIGS. 5 and 6, the winding directions of the first induction heating coil portion 12 and the second induction heating coil portion 14 are opposite to each other (opposite winding directions) in E and F arrows. The spiral shape (solenoid shape) may be wound so that the spiral shape (solenoid shape) is wound symmetrically with the gap G in between.

In this case, as shown in FIGS. 5 and 6, the rear end portion 12b of the first induction heating coil portion 12 and the rear end portion 14a of the second induction heating coil portion 14 are connected to each other. Electrically connected by 16. Further, the front end portion 12a of the first induction heating coil portion 12 and the high frequency current source 30 are electrically connected, and the front end portion 14b of the second induction heating coil portion 14 and the high frequency current source 30 are connected to each other. Connect electrically. When the first induction heating coil unit 12, the second induction heating coil unit 14, the connection unit 16, and the high-frequency current source 30 are connected in this way, when the high-frequency current is applied to the induction heating coil 10 from the high-frequency current source 30, E In the arrow and F arrows, a high-frequency current flows in the same direction in the first induction heating coil portion 12 and the second induction heating coil portion 14.

(2) In the above-described embodiment, a single high-frequency current source 30 is used to energize the first induction heating coil portion 12 and the second induction heating coil portion 14 with a high-frequency current, but the present invention is limited to this. Of course, it is not a thing. For example, in the induction heating coil 10, the first induction heating coil portion 12 and the second induction heating coil portion 14 are electrically insulated from each other without providing the connecting portion 16, and the first induction heating coil portion 12 is formed. And the second induction heating coil unit 14 are provided with high-frequency current sources for energizing the high-frequency current, respectively, and the high-frequency current sources provided for the first induction heating coil unit 12 and the second induction heating coil unit 14, respectively, are provided. It may be driven synchronously to start and stop energization.

(3) In the above-described embodiment, the first induction heating coil portion 12 and the second induction heating coil portion 14 are configured to have a substantially square shape in the XZ plane, but the present invention is not limited to this. Of course there is no such thing. For example, the first induction heating coil portion 12 and the second induction heating coil portion 14 may be configured to have a substantially circular shape in the XZ plane, or the first induction heating coil portion 12 and the second induction heating portion 12 may be configured. The coil portion 14 may be configured to have an appropriate polygonal shape of a substantially triangular shape or a substantially pentagonal shape or more in the XZ plane.

(4) In the above-described embodiment, the case where the cylindrical object to be heated is heated as the heated portion 20 has been described, but it is needless to say that the present invention is not limited to this. For example, the heated portion 20 may have an appropriate polygonal prism shape or any other shape.

(5) In the above-described embodiment, the connection portion 16 is configured to connect the first induction heating coil portion 12 and the second induction heating coil portion 14 on the upper side, but the present invention is not limited to this. Of course. For example, the first induction heating coil portion 12 and the second induction heating coil portion 14 may be configured to be connected on the lower side. Even when the first induction heating coil section 12 and the second induction heating coil section 14 are connected on the lower side, the first induction heating coil section 12 and the second induction heating section can be heated by moving the object to be heated 20 in and out from the upper side. There are no restrictions when arranging the object to be heated 20 in the gap G between the coil portion 14 and the coil portion 14.

(6) In the above-described embodiment, the spiral shape of the first induction heating coil portion 12 and the second induction heating coil portion 14 is shown to be a normal spiral shape, but the spiral shape is not limited to this. is there. As shown in FIGS. 7 and 8, for example, the spiral shape of the first induction heating coil portion 12 and the second induction heating coil portion 14 has a winding height (position in the Y-axis direction) at only one circumferential location. ) Is changed, and the height (position in the Y-axis direction) of the other portion is kept constant, so-called parallel winding spiral shape may be used. In short, the spiral shape in the present invention means the entire shape of a three-dimensional curve that rises in a direction having a component perpendicular to the surface of revolution while rotating, and is not particularly limited.

(7) In the above-described embodiment, the magnetic material is not arranged on the inner diameter side of the spiral shape of the first induction heating coil portion 12 and the second induction heating coil portion 14, but the present invention is not limited to this. Of course. For example, as shown in FIGS. 9 and 10, a square pillar-shaped body 40 made of a magnetic material such as iron is arranged on the inner diameter side of the spiral shape of the first induction heating coil portion 12, and the second induction heating coil portion 14 is arranged. A square pillar-shaped body 42 made of a magnetic material such as iron may be arranged on the inner diameter side of the spiral shape of the above. In this way, the inductance can be increased by arranging the magnetic material on the inner diameter side of the spiral shape of the first induction heating coil portion 12 and the second induction heating coil portion 14. The composition, shape, size, etc. of the magnetic material arranged on the inner diameter side of the spiral shape of the first induction heating coil portion 12 and the second induction heating coil portion 14 are described above with reference to FIGS. 9 and 10. It is not limited to the one described above, and any size and shape may be appropriately selected.

(8) Of course, the above-described embodiments and the above-described embodiments (1) to (7) may be combined as appropriate.

The present invention can be used when an object to be heated is inserted into an induction heating coil and induction heating is performed, such as brazing work by induction heating.

10 Induction heating coil 12 1st induction heating coil (1st induction heating coil)
12a Front end of the first induction heating coil 12b Rear end of the first induction heating coil 14 Second induction heating coil (second induction heating coil)
14a Rear end of 2nd induction heating coil 14b Front end of 2nd induction heating coil 16 Connection part 20 Heated object 30 High frequency current source 40 Square pillar shape 42 Square pillar shape G With 1st induction heating coil Gap between the 2nd induction heating coil 100 High frequency current source 200 Saddle type induction heating coil 200a Upper side coil 200b Lower side coil 300 Heated object A Front end area of saddle type induction heating coil B Pocket of saddle type induction heating coil Department area

Claims (10)

In an induction heating coil that heats an object to be heated by induction heating
It has a first induction heating coil portion and a second induction heating coil portion arranged at intervals at which an object to be heated can be arranged .
The first induction heating coil portion and the second induction heating coil portion each have a spiral shape.
The object to be heated is arranged between the extension direction of the spiral shape in the first induction heating coil portion and the extension direction of the spiral shape in the second induction heating coil portion.
By energizing the first induction heating coil portion and the second induction heating coil portion, the high-frequency current flowing through the first induction heating coil portion and the second induction heating coil portion causes the heating. An induction heating coil characterized in that an induction current flows in the same direction along the peripheral surface of an object. In the induction heating coil according to claim 1, the first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in the same winding direction. coil. The induction heating coil according to claim 1, wherein the first induction heating coil portion and the second induction heating coil portion are wound in a spiral shape in opposite winding directions. Heating coil. In the induction heating coil according to claim 2.
One end of the first induction heating coil portion in the extension direction of the spiral shape and the other end of the second induction heating coil portion in the extension direction of the spiral shape on the opposite side of the one side. Connected to the side edge,
The other end of the first induction heating coil portion in the spiral shape and the one end portion of the second induction heating coil portion in the spiral shape are the first induction heating coil portion. An induction heating coil characterized in that it is connected to a high frequency current source that conducts a high frequency current to the second induction heating coil portion. In the induction heating coil according to claim 3,
One end of the first induction heating coil portion in the extension direction of the spiral shape and the one end portion of the second induction heating coil portion in the extension direction of the spiral shape are connected to each other.
The other end of the first induction heating coil portion on the opposite side to the one end in the spiral shape and the other end of the second induction heating coil portion in the spiral shape are An induction heating coil characterized in that it is connected to a high-frequency current source that conducts a high-frequency current to the first induction heating coil portion and the second induction heating coil portion. In the induction heating coil according to any one of claims 4 or 5.
An induction heating coil characterized in that the first induction heating coil portion and the second induction heating coil portion are connected to either the upper side or the lower side. In the induction heating coil according to any one of claims 2, 3, 4, 5 or 6.
The spiral shape is an induction heating coil characterized in that a substantially quadrangular region is continuous in a spiral shape. In the induction heating coil according to claim 7.
The induction heating coil portion is characterized in that the first induction heating coil portion and the second induction heating coil portion are arranged so that side regions in the substantially square shape of each other face each other. In the induction heating coil according to any one of claims 2, 3, 4, 5, 6, 7 or 8.
The spiral shape is an induction heating coil characterized by having a normal spiral shape or a parallel winding spiral shape. In the induction heating coil according to any one of claims 2, 3, 4, 5, 6, 7, 8 or 9.
An induction heating coil characterized in that a magnetic material is arranged on the inner diameter side of the spiral shape.

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