JP5558304B2 - Induction heating apparatus and heated object - Google Patents

Description

  The present invention relates to an induction heating device provided with an induction heating coil and a heated object heated by the induction heating device, and in particular, can suppress an increase in temperature of the induction heating coil.

  In a conventional induction heating apparatus, an induction heating coil is disposed horizontally with respect to a heated object (see, for example, Patent Document 1).

JP 2004-362945 A

  In the conventional induction heating apparatus, since the induction heating coil is arranged horizontally, the temperature of the induction heating coil is likely to rise, so that the induction heating coil temperature does not rise above the insulation temperature of the coil wire constituting the induction heating coil. There was a problem that it was expensive to make.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an induction heating apparatus and an object to be heated that can suppress the temperature rise of the induction heating coil.

This invention is an induction heating apparatus provided with an induction heating coil for heating an object to be heated,
In the induction heating coil, a coil conductor is wound a plurality of times in the radial direction, and the coil conductor has a gap in the radial direction.
The induction heating coil is formed by forming a plurality of windings of the coil lead wire, connecting the layers in series, with the winding direction being different in each layer,
The spacing between the coil conductor keeps a distance of the respective layers comprise a spacer for retaining a space to the stacking direction of the induction heating coil is to also have an opening in the radial direction between the coil wires.

Since the induction heating device of the present invention is configured as described above,
An increase in temperature of the induction heating coil can be suppressed.

It is a figure which shows the structure of the induction heating coil of the induction heating apparatus of Embodiment 1 of this invention. It is a figure which shows the structure of the induction heating coil of the induction heating apparatus of Embodiment 2 of this invention. It is a figure which shows the structure of the induction heating coil of the induction heating apparatus of Embodiment 3 of this invention. It is a figure which shows the structure of the induction heating coil of the induction heating apparatus of Embodiment 4 of this invention. It is a figure which shows the structure of the induction heating coil of the induction heating apparatus of Embodiment 5 of this invention. It is a figure which shows the structure of the induction heating coil of the other induction heating apparatus of Embodiment 5 of this invention.

Embodiment 1 FIG.
Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view and a front view showing the configuration of the induction heating coil of the induction heating apparatus according to Embodiment 1 of the present invention. Here, an electronic resistor that consumes the electric power regenerated in the inverter using induction heating will be described as an example of the induction heating device. In FIG. 1, an induction heating coil 1 that heats an object to be heated 2 by an induction heating phenomenon of electric energy (electric power) is disposed so as to be perpendicular to the object to be heated 2. Further, the flat portion of the induction heating coil 1 is disposed so as to face the flat portion of the heated body 2. And the to-be-heated body 2 which receives the magnetic flux which the induction heating coil 1 generate | occur | produced, and is heated by induction heating, and the heat radiator 3 which is connected to the opposite side to the induction heating coil 1 of the to-be-heated body 2 and cools the to-be-heated body 2 And the heat insulating material 4 which insulates the heat | fever of the to-be-heated body 2 is provided. A thermally conductive grease or the like is interposed between the heated body 2 and the radiator 3.

  And the induction heating coil 1 is wound with a thin wire as the coil conductor 5 in a spiral shape. In order to form and maintain the space between the coil conductors 5, a comb-like or bead-shaped spacer 6 made of an insulator is sandwiched between the coil conductors 5. Alternatively, a copper plate may be processed into the above shape as a wire. Moreover, the cross-sectional shape of the coil conducting wire 5 may be formed in a circular shape, a polygonal shape, or a shape in which a plurality of wires are more combined. Furthermore, it is also conceivable that the induction heating coil 1 is coated in a color that reflects heat energy. Specifically, the color for coating the induction heating coil surface may be any color having a gloss such as gold or silver. Since these contents are the same in the following embodiments, the description will be omitted as appropriate.

  According to the induction heating apparatus of the first embodiment configured as described above, since the induction heating coil is arranged so as to be perpendicular to the heated object, the induction heating coil or the heated object is heated. As shown by the arrow A, the air becomes a rising air current and escapes to the upper part and is exhausted. Moreover, since there is a space between the coil conductors, the surface area in contact with air is increased, the heat transfer area is increased, and the thermal resistance of the induction heating coil is reduced. Further, since a thin winding is used for the coil conductor, the heat transfer area is increased, and the winding of the induction heating coil is a small diameter cylinder, so that heat transfer characteristics are improved during natural convection and forced convection. Therefore, it is possible to efficiently dissipate heat due to copper loss and radiation from the object to be heated. Further, by providing a heat insulating material between the heated body and the induction heating coil, heat conduction due to radiation from the heated body to the induction heating coil can also be reduced.

Embodiment 2. FIG.
2 is a cross-sectional view and a front view showing the configuration of the induction heating coil of the induction heating apparatus according to Embodiment 2 of the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The induction heating coil 1 is formed by forming a plurality of windings of the coil conductors 5 and 15 and connecting the coil conductors 5 and 15 of the respective layers in series with the winding directions being different in the coil conductors 5 and 15 of the respective layers. Has been. Specifically, the coil conducting wire 5 is wound counterclockwise, the coil conducting wire 15 is wound clockwise, the coil conducting wire 5 and the coil conducting wire 15 are connected at the central portion, and the two are connected in series. A single induction heating coil 1 is used. A space is provided between the two coil conductors 5 and the coil conductor 15, and a space is maintained by the spacer 16 so as not to contact each other.

  According to the induction heating device of the second embodiment configured as described above, the number of turns increases due to the shape of the induction heating coil as well as the same effect as that of the first embodiment. Can be obtained. Moreover, it becomes easy to provide a connection terminal with an external circuit and a terminal for connecting a plurality of coils in parallel. Further, the inductance value of the induction heating coil can be increased by connecting the two layers in series.

Embodiment 3 FIG.
FIG. 3 is a cross-sectional view showing the configuration of the induction heating coil of the induction heating apparatus according to Embodiment 3 of the present invention. In the third embodiment, an example of the configuration of an electronic resistor that matches the field direction with the terminal facing outside is shown. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. As in the second embodiment, two induction coil coils 5 and 15 having different winding directions are connected at the center and connected in series to constitute one induction heating coil 1. Furthermore, it is comprised by arrange | positioning the some induction heating coil 1 so that the some to-be-heated body 2 may be clamped.

  According to the induction heating apparatus of the third embodiment configured as described above, the object to be heated and the induction heating coil can be cooled at the same time, as well as the same effects as those of the above embodiments. In addition, since the insulation of the induction heating coil is not broken even if the temperature of the induction heating coil rises, high temperature operation is possible. In addition, by configuring two layers with different winding directions as one induction heating coil, there is no need to provide a lead wire when connecting to a drive circuit or another induction heating coil, and it is possible to connect at the outer periphery of the induction heating coil. it can.

Embodiment 4 FIG.
FIG. 4 is a cross-sectional view and a front view showing the configuration of the induction heating coil of the induction heating apparatus according to Embodiment 4 of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. In the figure, the induction heating coil 1 forms a plurality of windings of coil conductors 5 and 25, and the coil conductors 5 and 25 of each layer are connected in parallel, with the winding direction being the same direction. Is formed. And the induction heating coil 1 is laminated | stacked shifting each center of each layer of the coil conducting wire 5 and the coil conducting wire 25. FIG.

  According to the induction heating apparatus of the fourth embodiment configured as described above, the effect similar to that of each of the above embodiments can be obtained, and the coil conductors of the respective layers are alternately arranged, so that each layer Since the distance between the coil conductors is increased, it is possible to make the coil conductor less susceptible to thermal interference on the heated body side of the coil conductor due to copper loss between the coil conductors. As a result, the induction heating coil is heated by the copper loss and the radiant heat from the object to be heated, so that the temperature rise of the induction heating coil can be reduced, and the insulation between the coil conductors can be maintained when the temperature of the induction heating coil rises. it can. Thereby, since the induction heating coil can be used at a high temperature, it is possible to increase the power capacity of the electronic resistor using this induction heating device.

Embodiment 5 FIG.
5 is a cross-sectional view and a front view showing a configuration of an induction heating coil of an induction heating apparatus according to Embodiment 5 of the present invention. In the figure, the same parts as those in the above embodiments are denoted by the same reference numerals, and description thereof is omitted. In the figure, there is provided a fan 7 that applies wind B from the center of the front side of the induction heating coil 1.

  According to the induction heating device of the fifth embodiment configured as described above, the induction heating coil is forcibly cooled by the fan as well as the same effects as those of the above embodiments. The heating coil is heated by the copper loss and the radiant heat from the object to be heated, so that the temperature rise of the induction heating coil can be reduced and the insulation between the coil conductors can be maintained when the temperature of the induction heating coil rises. In this configuration, the wind A ′ flows toward the center of the induction heating coil by the fan, and the coil can be cooled by the radial air flow in the heated object. Note that the wind A ′ includes the updraft wind A. In this structure, the induction heating coil can be considered as a group of minute circular cylinders, and the heat transfer characteristic is excellent because the temperature boundary layer around the copper wire of the induction heating coil is thin. Thereby, since a coil can be used at high temperature, the power capacity of the electronic resistor using the said induction heating apparatus can be taken large. Furthermore, since the induction heating coil temperature does not change greatly, an increase in copper loss in the induction heating coil can be suppressed.

  Moreover, as shown in FIG. 6, the fin 8 is directly installed in the to-be-heated body 2 on the surface opposite to the induction heating coil 1, and the several fin 8 is arrange | positioned in the horizontal direction. Thereby, the induction heating coil 1 can radiate the induction heating directly by the fins 8. In this case, no thermal conductive grease or the like is required between the heated body and the heat radiating body, the thermal resistance of the heated body can be lowered, and the temperature rise of the induction heating coil 1 can be suppressed.

1 induction heating coil, 2,20 object to be heated, 5, 15, 25 coil conductor,
6,16 Spacer, 7 Fan, 8 Fin, 21 Ventilation hole,
A, A ', A ", B wind.

Claims (8)

An induction heating apparatus provided with an induction heating coil for heating an object to be heated,
In the induction heating coil, a coil conductor is wound a plurality of times in the radial direction, and the coil conductor has a gap in the radial direction.
The induction heating coil is formed by forming a plurality of windings of the coil lead wire, connecting the layers in series, with the winding direction being different in each layer,
An induction heating apparatus that includes a spacer that holds a space between the coil conductors and maintains a space between the coil conductors with a space in a stacking direction of the induction heating coils, and has an opening in a radial direction between the coil conductors . An induction heating apparatus provided with an induction heating coil for heating an object to be heated,
In the induction heating coil, a coil conductor is wound a plurality of times in the radial direction, and the coil conductor has a gap in the radial direction.
The induction heating coil is formed by forming a plurality of windings of the coil conducting wire, with the winding direction being the same direction in each layer, and connecting the layers in parallel.
An induction heating apparatus that includes a spacer that holds a space between the coil conductors and maintains a space between the coil conductors with a space in a stacking direction of the induction heating coils, and has an opening in a radial direction between the coil conductors. The induction heating apparatus according to claim 1, wherein a plurality of the induction heating coils are connected . The induction heating coil, from claim 1, characterized in that the spacing between the coil conductors are stacked by shifting the centers of each layer of the coil wire while maintaining the stacking direction of the induction heating coil The induction heating apparatus according to claim 3 . The induction heating apparatus according to any one of claims 1 to 4 , wherein the coil conductor is coated with a color that reflects thermal energy. The induction heating apparatus according to any one of claims 1 to 5 , further comprising a fan that supplies air to a central portion of the induction heating coil. The induction heating coil is arranged so that air heated by the induction heating coil or the heated object becomes an ascending current and is exhausted along an in-plane direction of the induction heating coil. The induction heating apparatus according to any one of claims 1 to 6 . A said heated body to be heated by induction heating device as claimed in any one of claims 7,
An object to be heated, comprising a plurality of fins that are directly installed on a surface opposite to the induction heating coil and arranged in the horizontal direction.

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