Temperature controller of electromagnetic induction heater and its start system
First Claim
1. A temperature controller used for an electromagnetic induction heating apparatus provided with a heating element made of magnetic material and prepared in a fluid passage, a coil prepared in a perimeter of the heating element and a high frequency electric current generator for the coil, said electromagnetic induction heating apparatus having a magnetic transformation temperature where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high,said temperature controller, comprising:
- an electric current detection device measuring an electric current flowing from the high frequency electric current generator to the coil and detecting that a temperature of magnetic material forming the heating element having a temperature reaching in the vicinity of the magnetic transformation temperature; and
an electric current restrictive device limiting the electric current flowing to the coil based on said electric current detection device.
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Accused Products
Abstract
The present invention relates to a temperature controller used for an electromagnetic induction heating apparatus provided with a heating element made of magnetic material, and prepared in a fluid passage. A coil is prepared in the perimeter of the heating element and a high frequency electric current generator for the coil. The temperature controller comprises an electric current detection unit measuring the electric current flowing from the high frequency electric current generator to the coil and detecting that the temperature of magnetic material forming the heating element reaches in the vicinity of the magnetic transformation temperature, and an electric current restrictive unit limiting the electric current flowing to the coil based on the electric current detection unit. When the temperature of the heating element reaches in the vicinity of the magnetic transformation temperature, the electric current detection unit detects the rising electric current and the electric current restrictive unit limits the further rising electric current.
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Citations
12 Claims
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1. A temperature controller used for an electromagnetic induction heating apparatus provided with a heating element made of magnetic material and prepared in a fluid passage, a coil prepared in a perimeter of the heating element and a high frequency electric current generator for the coil, said electromagnetic induction heating apparatus having a magnetic transformation temperature where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high,
said temperature controller, comprising: -
an electric current detection device measuring an electric current flowing from the high frequency electric current generator to the coil and detecting that a temperature of magnetic material forming the heating element having a temperature reaching in the vicinity of the magnetic transformation temperature; and an electric current restrictive device limiting the electric current flowing to the coil based on said electric current detection device. - View Dependent Claims (2, 3)
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4. A temperature controller used for an electromagnetic induction heating apparatus provided with a heating element made of magnetic material and prepared in a fluid passage, a coil prepared in a perimeter of the heating element and a high frequency electric current generator for the coil, said electromagnetic induction heating apparatus having a magnetic transformation temperature where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high,
said temperature controller, comprising: -
a temperature regulator measuring a fluid temperature at the side of outlet of the fluid passage and outputting an instruction corresponding to a difference between the measured temperature and a required temperature so that the measured temperature can coincide with the required temperature; an electric current controlling device controlling an output of the high frequency electric current generator based on said instruction from said temperature regulator; an electric current restrictive device measuring an electric current flowing from the high frequency electric current generator to the coil and detecting that a temperature of magnetic material forming the heating element having a temperature reaching in the vicinity of the magnetic transformation temperature; and an electric current restrictive device outputting an instruction of limiting the electric current flowing through the coil to said electric current controlling device based on said electric current detection device to take precedence of the instruction of the temperature regulator. - View Dependent Claims (5)
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6. A temperature controller used for an electromagnetic induction heating apparatus provided with a heating element made of magnetic material and prepared in a fluid passage, a coil prepared in a perimeter of the heating element and a high frequency electric current generator for the coil, said electromagnetic induction heating apparatus having a magnetic transformation temperature where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high,
said temperature controller, comprising: -
a temperature regulator measuring a fluid temperature at the side of outlet of the fluid passage and outputting an instruction corresponding to a difference between the measured temperature and a required temperature so that the measured temperature can coincide with the required temperature; an electric current detection device measuring an electric current flowing from the high frequency electric current generator to the coil and detecting a temperature of magnetic material forming the heating element reaches approximately the magnetic transformation temperature; an electric current controlling device controlling an output of the high frequency electric current generator based on said instruction from said temperature regulator or said electric current detection device; and an electric current restrictive device connected with said temperature regulator, said electric current detection device and said electric current controlling device output to an instruction for limiting the electric current flowing through the coil to said electric current controlling device based on said electric current detection device to take precedence of the instruction of the temperature regulator. - View Dependent Claims (7)
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8. A method of starting an electromagnetic induction heating apparatus provided with a heating element made of magnetic material and prepared in a fluid passage, a coil prepared in a perimeter of the heating element, a high frequency electric current generator for the coil and a temperature regulator for measuring a fluid temperature at the side of outlet of the fluid passage and adjusting an output of the high frequency electric current generator, said electromagnetic induction heating apparatus having a magnetic transformation temperature where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high,
said method comprising: -
filling the fluid passage with a fluid to keep the heating element in the static fluid; flowing the electric current from the high frequency electric current generator to the coil to set a required temperature in the temperature regulator; preheating the heating element and the fluid with limiting the electric current and taking precedence of an instruction of the temperature regulator when a temperature of the magnetic material forming the heating element reaches a temperature in the vicinity of a magnetic transformation and the electric current flowing through the coil increases; and starting the electromagnetic induction heating apparatus to flow out the fluid from the fluid passage. - View Dependent Claims (9, 10)
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11. A temperature controller for use in an electromagnetic induction heating apparatus having a heating element, comprising:
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an electric current detection device detecting a rise in temperature in the vicinity of a magnetic transformation temperature of a magnetic material forming the heating element where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high; and an electric current restrictive device limiting the electric current flowing to a coil based on the electric current detection device.
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12. A method of controlling the temperature in an electromagnetic induction heating apparatus having a heating element, comprising:
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detecting a rise in temperature in the vicinity of a magnetic transformation temperature of a magnetic material forming the heating element where a degree of magnetism decreases when temperature of a magnetic material of the heating element becomes high; and limiting the electric current flowing to a coil based on the electric current detection device.
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Specification