JPH04206291A - Heating device - Google Patents

Abstract

PURPOSE:To reduce power loss and high frequency noise by containing an annular magnetic core around which a primary coil is wound inside an annular hollow body composed of integrated secondary conductor and a heating body. CONSTITUTION:A cylindrical heating body 2 is fixed to an annular secondary conductor 1 at the central part thereof such that the conductor 1 is integrated with the heating body 2. In an internal space 3 formed by the conductor 1 and the heating body 2, a transformer 6 where a primary core 5 is wound around an annular magnetic core 4 is installed. With the constitution, a conductor for connecting the secondary conductor 1 to the heating body 2 is unnecessary, whereby power loss can be reduced. Furthermore, since the core 4 is stored inside the hollow body 3, magnetic leakage to the outside is prevented to reduce generation of high frequency noise.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is capable of melting and mixing metals and other samples in a furnace, or by generating heat, etc., by electromagnetic induction generated by applying an alternating voltage to a transformer. The present invention relates to an electromagnetic induction heating device for performing.

[Conventional technology]

The above-mentioned electromagnetic induction heating device conventionally consists of a transformer consisting of a primary winding and a secondary winding wound around a magnetic core, a power control section that applies alternating current voltage to the transformer, and a heating element to which power is supplied from the transformer. The power control unit and the transformer, and the transformer and the heating element were connected by copper wires, etc., and these were used as current paths to supply power to the heating element.

[Problems to be Solved by the Invention] By the way, the tM1 induction heating device described above requires a large amount of power to be supplied in order to perform high-temperature heating. Proportionally, the power loss becomes significant by the amount of resistance. In order to reduce this power loss, it is necessary to increase the cross-sectional area of the conductor, which has the drawback of increasing the size and weight of the device.

Additionally, in order to make transformers smaller and lighter, it is important to increase the frequency of the supply voltage and make the magnetic core smaller, but high-frequency noise is generated due to the inductance of the transformer's magnetic core and the connecting conductors. (Similar high-frequency noise is also generated in the power control section), and conventional configurations have limitations in reducing size and weight.

The present invention has been made with the above-mentioned considerations in mind, and its purpose is to provide a small, lightweight heat generating device with little power loss and high frequency noise.

Means for Solving Problem C] In order to achieve the above-mentioned object, the heat generating device according to the present invention has the following features:
It is characterized by housing a ring-shaped magnetic core around which a primary winding is wound inside an annular hollow body formed by integrally molding a secondary conductor and a heating element.

[Effect]

According to the characteristic configuration described above, since the secondary conductor and the heating element are integrated, a conductor connecting the secondary conductor and the heating element is not required, and power loss can be reduced. Further, since the magnetic core is housed inside the annular hollow body formed by the secondary conductor and the heating element, there is no magnetic field leakage to the outside, and high frequency noise can be reduced.

Furthermore, since the frequency of the voltage applied to the primary winding can be increased, the magnetic core can be made smaller than before, resulting in a more compact configuration.
Can be manufactured lightweight.

C Embodiment] Hereinafter, embodiments of the present invention will be explained based on the drawings. FIGS. 1 to 3 show a first embodiment of the present invention, and in the figures, l
is an annular secondary conductor made of copper or aluminum, etc., and a cylindrical heating element 2 made of ceramic, carbon, silicon carbide, etc. is fixed to the center of the secondary conductor 1. , the secondary conductor 1 and the heating element 2 are integrated.

In the internal space 3 formed by the secondary conductor 1 and the heating element 2, a transformer 6 is installed, which has a primary winding 15 wound around an annular magnetic core 4 made of ferrite or the like. In addition, internal space 3
is filled with a heat insulating material 7.

Also, the primary winding 5 from the transformer 6 passes through the pore 8 to the third
It is connected to the power control section 9 shown in the figure.

The power control unit 9 is composed of, for example, an inverter power supply or a switching power supply, and is connected to a commercial power supply (not shown) via a connection line 10. Note that the power control unit 9 includes an internal body 11 (copper or copper) for blocking high frequency noise.

(made of aluminum or the like), and is configured to prevent high frequency noise from the power control section 9 from leaking to the outside.

So, a heat generating bag with the above configuration! To explain the effect of , first, 50 or 60. H
By applying an alternating current voltage of z to the power control section 9, a high frequency voltage of about 100 kHz to I Ml (about z is generated from the power control section 9.

Next, when this high frequency voltage is applied to the primary winding 5, an induced voltage is generated in the secondary conductor 1 due to electromagnetic induction. Since the secondary conductor 1 is short-circuited by the heating element 2, the secondary current flows in the direction indicated by the arrow P shown in Figs. is high, the electric power generated by the secondary current is converted into heat in the heating element 2, and therefore the inner peripheral portion Q of the heating element 2 has a function as a heating furnace.

Note that the heating element 2 may not have a hollow center but may be solid as described later.Furthermore, the heating element 2 may be provided not at the center of the secondary conductor 1 but at its outer periphery. .

FIG. 4 shows a second embodiment of the present invention, in which the power control section 9 is enclosed by the secondary conductor I instead of the inner enclosure 11. According to this structure, the third Compact and compact compared to the case where the inner envelope 11 shown in the figure is provided.
Moreover, it can be manufactured at low cost.

The other configurations are the same as in the previous embodiment.

5 and 6 show a third embodiment of the present invention. In the figures, la and lb are respectively three-dimensionally molded secondary conductors, and for example, each circumferential portion is a bolt with excellent conductivity. 12 and NAND 13, and the secondary conductors 1a and lb are integrated. A heating element 2 is locked to the secondary conductor 1a, lb by a locking member 14 at the center of the secondary conductor 1a, lb.

15 is a reflective member for efficiently concentrating the heat from the heating element 2 on the inner circumferential portion Q, and is fixed near the heating element 2 by a heat insulating material 7.

According to this configuration, the individually molded secondary conductors la,
Since the lb is integrated by the hole 2 and the nut 13, the manufacturing method becomes simple and it becomes possible to manufacture the secondary conductors 1a and lb in various shapes. The other configurations are the same as in the previous embodiment.

Furthermore, in the structure shown in FIG. 5.6, the power control section 9 may be enclosed by the secondary conductors 1a and lb, as in the second embodiment.

7 and 8 show a fourth embodiment of the present invention, in which one side of each of two annular magnetic cores 4a and 4b are connected to form two branched magnetic circuits, and both magnetic This is a bonding furnace configured so that secondary conductors 1a and lb are interlinked with the circuits, respectively.

That is, heating elements 2a and 2b as heating furnaces are provided in the center of each annular magnetic core 4a and 4b, and the heating elements 2a and 2b are provided as heating furnaces.
a, 2b are locked with the integrated secondary conductors 1a, lb by bolts 12 and nuts 13, so that the annular magnetic cores 4a, 4b are enclosed by the secondary conductors 1a, lb.

Therefore, the two heating furnaces can be controlled by two power control units (not shown), making the entire apparatus compact. By using heating elements 2a and 2b with different resistance values, it is also possible to create a heating furnace with two types of temperatures.

Further, by combining a plurality of annular magnetic cores, a plurality of heating furnaces can be configured in a single heat generating device.

FIG. 9 and FIG. 1O show a fifth embodiment of the present invention, in which a sample 16 such as carbon is filled in the inner circumferential portion Q instead of the heating element 2, and by heating the sample 16, infrared rays are generated. It is a light emitter that uses

That is, the sample 16 is filled in the inner circumference Q with a lid 19 fixed to the secondary conductor 1a by screws 17 and nuts [8] made of ceramic or the like. Further, the lid body 19 is provided with an infrared transmission filter 20. Sample 16
The secondary conductor generates heat due to the flow, and the temperature is adjusted to a specific temperature by measuring the temperature with the temperature detector 21 installed in contact with the sample. radiated to the outside through the

The infrared rays thus generated can be used, for example, as a light source for an infrared analyzer, a temperature standard for a radiation thermometer, or an infrared generator for temperature calibration.

As is clear from the above embodiments, the shape and number of the secondary conductor or the annular magnetic core are arbitrary and needless to say are not limited.

C Effects of the Invention] As explained above, according to the present invention, since the secondary conductor and the heating element are integrated, there is no need for a conductor to connect the secondary conductor and the heating element, reducing power loss. be able to. Further, since the magnetic core is housed inside the annular hollow body formed by the secondary conductor and the heating element, there is no magnetic field leakage to the outside, and high frequency noise can be reduced.

Furthermore, since the frequency of the voltage applied to the primary winding can be increased, the magnetic core can be made smaller than before, resulting in a more compact configuration.
Can be manufactured lightweight.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a perspective view of the main parts of the heat generating device, FIG. 2 is a schematic vertical sectional view of the heat generating device, and FIG. 3 is a schematic longitudinal sectional view of the heat generating device. It is an overall perspective view. FIG. 4 is a schematic vertical sectional view of a heat generating device showing a second embodiment of the present invention. 5 and 6 show a third embodiment of the present invention;
The figure number is a perspective view of the main parts of the heat generating device, and FIG. 6 is a schematic vertical sectional view of the heat generating device. 7 and 8 show a fourth embodiment of the present invention;
The figure is a schematic longitudinal sectional view of the heat generating device, and FIG. 8 is a perspective view of the main parts of the heat generating device. 9 and 10 show a fifth embodiment of the present invention, in which FIG. 9 is a schematic vertical sectional view of the light emitter, and FIG. 10 is a perspective view of the main parts of the light emitter. 1, la, 1b-=secondary conductor, 2.2a, 2b
- Heating element, 4, 4a, 4b...Magnetic core, 5...Primary winding. Applicant: Horiba, Ltd. Agent: Hideo Fujimoto, Patent Attorney: Figure 1, Figure 5...Primary winding, Figure 2, Figure 3, Figure 4, Figure 7

Claims (1)

[Claims] A heat generating device that includes a ring-shaped magnetic core around which a primary winding is wound inside an annular hollow body formed by integrally molding a secondary conductor and a heat-generating element.