JP4047488B2 - Heat plate equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat plate apparatus.
[0002]
[Prior art]
It may be required to electrically heat any flat or curved plate. Conventionally, a heating wire such as a nichrome wire is enclosed in the plate, and the plate is heated by energizing it to generate heat. However, such a means is disadvantageous in that it is affected by the thermal inertia of the plate, so that the thermal response is poor and the temperature control is troublesome.
[0003]
In order to avoid this, it has been proposed to generate heat by electromagnetic induction. In this method, magnetic flux generated by electromagnetic induction is linked to the plate, thereby causing current to be induced in the plate, and the plate is heated by Joule heat due to this current.
[0004]
However, in order to generate heat by such electromagnetic induction, it is necessary to use an electromagnetic induction heating mechanism having an iron core and an induction coil wound around the iron core. Since it is necessary to install the magnetic flux so as to be linked to the blade, it must be installed so as to face the plate. Therefore, the size of the apparatus is increased, and the use conditions are restricted. There are disadvantages.
[0005]
Furthermore, the electromagnetic induction heating mechanism used here has the inconvenience of having to determine the size and shape of the iron core according to the size and shape of the plate to be heated. A mechanism must be installed, and when a plurality of electromagnetic induction heat generating mechanisms are installed in this way, it is difficult to heat the plate uniformly over the entire surface.
[0006]
[Problems to be solved by the invention]
The object of the present invention is to generate heat uniformly over the entire surface of the plate with a simple structure when the plate is electrically heated.
[0007]
[Means for Solving the Problems]
In the present invention, an induction coil and a belt-like coil that is magnetically coupled to the induction coil are wound around the iron core leg of the iron core structure constituting the closed magnetic circuit, and a metal heating plate is attached to one end of the belt-like coil. respectively connecting the conductor to the other end, and the heating plate and the conductor integrated are overlapped in a state of being insulated, heating plates, formed by electrically connecting the tip of the conductor, the further heating plate, inside the jacket chamber enclosing a heating medium in the gas-liquid two-phase, is characterized mainly in that plurality along the length of the heating plate so as to extend along the width direction of the heating plate.
[0008]
Since the induction coil wound around the iron core leg and the strip-like coil are magnetically coupled, when the induction coil is excited with an AC power source, a secondary voltage is generated at both ends of the coil due to the principle of a transformer. Since a heat generating plate (simply referred to as a plate in the following description) conductor is connected between both ends of the coil, a current (secondary current) flows through the plate based on the secondary voltage. . This current generates Joule heat in the plate and heats it.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 denotes an iron core structure that constitutes a closed magnetic path, and includes a pair of iron core legs 2 and 3 and yokes 4 and 5 that bridge the ends of both iron core legs 2 and 3. In addition, both the core leg and the yoke shown in the figure are configured by a wound core. 6 is an induction coil wound around one iron core leg 2, which is excited by an AC power source.
[0010]
7 is a coil made of a strip-shaped copper body that is magnetically coupled to the induction coil 6, and is wound around the same iron core leg 2 as the induction coil 6 in the illustrated example. For example, an iron or stainless steel plate 9 is connected to one end 8 of the coil 7, and a copper conductor 11 is connected to the other end 10. Reference numeral 12 denotes a connection fitting for each connection.
[0011]
The plate 9 and the conductor 11 are integrally stacked with an insulating material 13 interposed therebetween. And each tip is electrically connected. For this purpose, they are superposed on the tip via a conductive material 14 and tightened with a fastening bolt 15 to be integrated.
[0012]
The plate 9 is provided with a jacket chamber 16 in which a gas-liquid two-phase heat medium (for example, water) is vacuum-sealed. The jacket chamber 16 is positioned such that its longitudinal direction (direction perpendicular to the direction of induced current flowing later) is along the width direction of the plate 9 and the longitudinal direction of the plate 9 (direction of induced current flowing later). Are arranged side by side along. The jacket chambers 16 communicate with each other through a communication passage 17.
[0013]
In the above configuration, when the induction coil 6 is excited by an AC power source, a secondary voltage is generated in the coil 7 magnetically coupled to the induction coil 6 according to the principle of the transformer. Since the plate 9 and the conductor 11 are connected to each end portion of the coil 7, a current induced by this voltage flows through the plate 9 and the conductor 11 along the longitudinal direction (indicated by arrows). Due to this current, Joule heat is generated in the plate 9, and the plate 9 generates heat due to this heat.
[0014]
According to such a configuration, the iron core structure 1, the induction coil 6, and the coil 7 necessary for inducing the current can be arranged to be biased toward the end portion side of the plate 9 to be heated. Therefore, it is not necessary to arrange the electromagnetic induction heating mechanism directly below the center of the plate 9 as in the case where the current is induced by making the magnetic flux perpendicular to the plate. Therefore, the height in the vertical direction in the central portion of the plate 9 can be made lower than that in the conventional configuration, and thus the size can be reduced accordingly.
[0015]
Further, since the induced current flows through the plate 9 along the longitudinal direction, the heat generation temperature along the longitudinal direction becomes uniform over the entire length. Moreover, since the jacket chamber 16 in which a gas-liquid two-phase heat medium is enclosed is installed inside the plate 9, the latent heat of evaporation when the heat medium is converted from the liquid phase to the gas phase by heating, or vice versa. The temperature distribution along the width direction of the plate 9 is made uniform by the latent heat of condensation when the gas phase is converted to the liquid phase. As a result, the heating temperature on the surface of the plate 9 can be made uniform over the entire surface. In addition, since the temperature of the entire plate surface becomes uniform in this way, it is not necessary to prepare a plurality of electromagnetic induction heating mechanisms as in the prior art even when the plate 9 is wide.
[0016]
In the configuration shown in the figure, the plate 9 is configured as one plane, but may be configured as an arbitrary curved surface (including a cubic curved surface) instead. Further, in the configuration shown in the figure, only the plate 9 generates heat. However, if the conductor 11 is replaced with a plate made of, for example, iron or stainless steel like the plate 9, heat can be generated on both sides. In this case, the plate is provided with a jacket chamber similar to that shown in the drawing.
[0017]
In the configuration shown in the figure, the iron core structure 1 and the coils 6 and 7 are installed at the end of the plate 9. However, the present invention is not limited to this configuration, and these are installed immediately below or just above the end of the plate 9. You may do it. In any case, these are not directly below the center of the plate 9 and therefore do not rise at the center of the plate 9.
[0018]
Next, a configuration for controlling the heat generation temperature of the plate in the present invention will be described. In FIG. 4, reference numeral 21 denotes a temperature sensor, which is installed by being embedded in the plate 9. A temperature controller 22 has a temperature setting function and a comparison function for comparing the temperature detected by the temperature sensor 21.
[0019]
When there is a difference between the temperature detected by the temperature sensor 21 and the set temperature, an output signal corresponding to the difference is output and sent to the power adjustment device 23. The electric power supplied from the AC power supply 24 to the induction coil 6 is adjusted by the power adjustment device 23. Thereby, the heat generation temperature of the plate 9 is adjusted.
[0020]
By this adjustment, control is performed so that the difference between the temperature detected by the temperature sensor 21 and the set temperature decreases, and thus the difference becomes zero. By controlling as described above, the heat generation temperature of the plate 9 can be controlled to an arbitrary value set in the temperature controller 21.
[0021]
【The invention's effect】
As described above, according to the present invention, a current is induced by electromagnetic induction, and the plate is heated by Joule heat generated by flowing the induced current through the plate. Therefore, compared with the conventional configuration using a heating wire. Thus, the responsiveness and controllability are improved, and compared with a configuration in which an electric current is induced in the plate using an electromagnetic induction heating mechanism, the entire surface of the plate can be heated uniformly. In addition, the heat generation temperature can be controlled to an arbitrary value.
[Brief description of the drawings]
FIG. 1 is a perspective view, partially in section, showing an embodiment of the present invention.
2 is a cross-sectional plan view of a portion of the plate of FIG.
3 is a cross-sectional view of FIG.
FIG. 4 is a perspective view showing a circuit for controlling the temperature of the plate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Iron core structure 2 Iron core leg 6 Inductive coil 7 Coil 9 Plate 11 Conductor 16 Jacket chamber 21 Temperature sensor 22 Temperature controller 23 Power adjustment apparatus 24 AC power supply

Claims (3)

An induction coil and a strip-shaped coil that is magnetically coupled to the induction coil are wound around the core leg of the core structure constituting the closed magnetic circuit, and a metal heating plate is provided at one end of the strip-shaped coil and a conductor is provided at the other end And electrically connecting the heat generating plate and the tip of the conductor, and the heat generating plate includes a jacket chamber in which a gas-liquid two-phase heat medium is enclosed along the width direction of the heat generating plate. A plurality of heat plate devices provided along the length direction of the heat generating plate. The core leg of the core structure constituting the closed magnetic circuit is wound with an induction coil and a strip-shaped coil that is magnetically coupled to the induction coil, and a metal heating plate is connected to each of both ends of the strip-shaped coil, The front ends of the heat generating plates are electrically connected, and the heat generating plates each include a jacket chamber in which a gas-liquid two-phase heat medium is sealed so as to extend along the width direction of the heat generating plates. A heat plate device provided in plural along the length direction of the heat generating plate. Based on a temperature sensor that detects the temperature of the heating plate, a temperature controller that detects a difference between a temperature detected by the temperature sensor and a set temperature, and outputs an output signal corresponding to the difference, and an output signal from the temperature controller And an electric power adjustment device for adjusting the electric power supplied from the AC power source to the induction coil so that a difference between a temperature detected by the temperature sensor and a set temperature is reduced. Heat plate device.

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