JPS6271189A - High frequency heating gas turbine generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-frequency heating gas turbine power generation device, particularly a high-frequency power generator directly connected to a gas turbine engine.
The present invention relates to a gas turbine power generation device for high frequency heating that supplies the generated high frequency power to a heating coil that performs high frequency heating.

[Prior Art] High-frequency heating, in which a high-frequency current is passed through a heating coil to heat the material placed inside the coil, is used for hardening materials such as iron. The heating effect is used to uniformly heat the heating material.

In the conventional high-frequency heating power supply device used for such high-frequency heating, as shown in FIG. Here, after being converted to direct current, it is supplied to the smoothing capacitor 16 and the inverter 18 via the output terminals 14a, 14b of the rectifier 12. Therefore, the DC power smoothed by the smoothing capacitor 16 is converted into single-phase high frequency power by the inverter 18.

This single-phase high-frequency power is supplied to a transformer 22 via terminals 20a and 20b, and the transformer 22 performs matching with the load. A power factor improving capacitor 24 and a heating coil 26 are connected to the transformer 22, and the object to be heated placed in the heating coil 26 can be heated by the high frequency power supplied from the transformer 22.

[Problems to be Solved by the Invention] However, the above-described conventional high-frequency heating power supply device has the following two problems.

(1) A commercial power source such as a three-phase AC power source is used as a power source for high-frequency heating, and high-frequency heating cannot be performed in a place where a commercial power source is not nearby.

(2) As the temperature of the heated object changes, the relative magnetic permeability and resistivity of the heated object change, making it impossible to perform high-frequency heating in an optimal state.

In other words, as shown in Fig. 5, the relative magnetic permeability μ generally decreases gradually as the temperature changes, and then suddenly drops at about 770' C), which is the characteristic of ferromagnetic materials. For example, the relative magnetic permeability is 1 at one Curie point.

Further, the resistivity ρ increases as the temperature of the heated object increases, reaches its highest point near the Curie point, and then rapidly decreases.

Then, by changing the relative magnetic permeability μ and resistivity ρ, the resonant frequency of the heating circuit is changed.

That is, since the inductance of the heating coil containing the object to be heated is expressed as L=f(ρ, μ), the resonant frequency fo is expressed as fo=Q(ρ, μ). Therefore,
According to the experimental sum, the relationship between the temperature of the heated object and the resonant frequency fo is as shown in FIG. There was a problem that the high frequency heating could not be carried out efficiently due to the change in the current.

The present invention was made in view of the above-mentioned conventional problems, and its purpose is to enable high-frequency heating even in places without commercial power supply,
Another object of the present invention is to provide a gas turbine power generation device for high frequency heating that can perform high frequency heating with high efficiency according to temperature changes of a heated object.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a power generation device for high frequency heating by directly connecting a high frequency generator to a gas turbine engine. It is characterized in that the temperature of the object to be heated is detected by a temperature sensor such as a thermocouple, and the frequency of the electric power applied to the heating coil is changed in accordance with the detected temperature.

[Operation] According to the above configuration, the gas turbine engine has 1
Since it rotates at 10,000 to 100,000 rpm, high-frequency power can be easily extracted from the generator by directly connecting the gas turbine engine and the generator.

Then, based on the detected temperature of the heated object, if the frequency of the power is changed so that it can be set to a resonance frequency that changes depending on the temperature change, the heated object can be efficiently heated with the optimal power. can.

[Example] Preferred embodiments of the present invention will be described below based on the drawings.

A first preferred embodiment of the present invention is shown in FIG.
In the figure, rectifier 12. Inverter 18, smoothing capacitor 16. Condenser υ24 for power factor improvement and heating coil 2
6 is the same as the conventional device, but the present invention eliminates the need for the conventional transformer.

The characteristic feature of the present invention is that high-frequency power can be easily generated by directly connecting the gas turbine engine to a high-frequency generator, and the frequency of this power can be varied according to temperature changes of the heated object. The high frequency power generation of the gas turbine engine 28 is directly connected to the output control circuit 30.
The engine speed is controlled by

A temperature sensor 34 such as a thermocouple is attached to the heated body 34 placed inside the heating coil 26 to detect the temperature thereof.
is provided, and the output of this temperature sensor 36 is supplied to a frequency control circuit 38.

This frequency control circuit 38 calculates a resonance frequency fo corresponding to the temperature of the heated body 34 based on the characteristics shown in FIG. 6, and controls the inverter 18 so as to reach this resonance frequency fo.

The first embodiment has the above configuration, and its operation will be explained below.

The gas turbine engine 28 of the present invention has a high frequency heating 30
As a result, for example, 86,00Or
A high frequency generator is operated at pm. This high frequency generator 3
Compared to conventional generators that rotate at several thousand ppm, the 0 does not require an intermediate device to obtain high-frequency power, so it can be manufactured as a small and lightweight device. Capacity and flow are 1/2 compared to conventional type
It has been reduced to about 0. Therefore, such a cast turbine engine 28 and high frequency power generation! By combining A30, a small and portable power generation device for high frequency heating can be obtained, and it is possible to easily generate high frequency 7J [] heat in places where there is no commercial power supply.

This high frequency emission? 1Jt30 is the aforementioned Lta 813. o
When rotating at oor'pm, 1,433112 (
7) Output high frequency power, and this high frequency power is passed through the rectifier 12.
and is supplied to the heating coil 26 via the inverter 18.

Then, this heating coil 26 heats the object to be heated 34 by 1JL1 using high frequency power, but at this time, the temperature of the object to be heated 34 is supplied to the frequency control circuit 38 by the temperature sensor +) 36, and the frequency control circuit At step 38, a resonant frequency fo corresponding to the detected temperature is calculated based on the temperature-resonant frequency characteristic as shown in FIG. Then, the inverter 1B performs frequency conversion to a resonant frequency fo corresponding to the temperature of the heated body 34, and supplies power at the converted optimal frequency to the heating coil 26.

Therefore, the object to be heated 34 is efficiently heated by the electromagnetic induction of the heating coil 26 based on the resonant frequency fo, and iron or the like can be hardened well.

FIG. 2 shows a second embodiment of the present invention, which is a first embodiment in which a frequency control signal based on a temperature detection signal is supplied to an inverter to change the inverter output frequency. Unlike the above, the gas turbine engine is configured to control the rotation speed of the gas turbine engine based on the temperature detection signal.

In the figure a), the output of the high-frequency generator 30 is directly supplied to the heating coil 26 without going through a rectifier, inverter, etc., and high-frequency power corresponding to the rotational speed of the gas turbine engine 28 is supplied to the heating coil 26. There is. As in the first embodiment, the temperature of the heated body 34 is detected by the temperature sensor 36, and the temperature of the heated body 34 is detected by the temperature sensor 36, and the temperature of the heated body 34 is detected by the temperature sensor 36.
The resonant frequency signal that follows the temperature of 4 is the output control n circuit 3.
2. Therefore, the output control circuit 32 controls the rotation speed of the cast turbine engine 28 to match the changing resonance frequency fo.

Although the present invention uses a gas turbine generator for high-frequency heating, changing the frequency in accordance with the temperature of the heated object can also be applied to conventional generators. In this case, as shown in FIG. 3, the resonant frequency signal cut out based on the temperature detection signal by the temperature sensor 36 is supplied from the frequency ii+11aO circuit 38 to the inverter 18 and a3. Similarly, this inverter 18
The power frequency is changed to the resonance frequency fo.

[Effects of the Invention] As explained above, according to the present invention, a Kasturbine power generation device in which a high-frequency generator is directly connected to a Kasturbine engine is used for high-frequency heating, and an electric current is applied to the heating coil in correspondence with the heating body. By changing the frequency of the electric power that is generated, it is possible to obtain high-frequency electric power even in places without commercial power supply using a small, light and fast device. It becomes possible to perform high-frequency heating with high efficiency.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing a first preferred embodiment of the high-frequency heating gas turbine power generator according to the present invention, FIG. 2 is a circuit diagram showing a second embodiment of the present invention, and FIG. 3 is a conventional circuit configuration diagram. Figure 4 is a circuit configuration diagram when converting the frequency corresponding to the temperature of the heated object using a generator. Figure 4 is a circuit diagram when high frequency heating is performed using a conventional power generator. FIG. 6 is a graph showing the relationship between the temperature of the heated body and the relative magnetic permeability and resistivity. FIG. 6 is a graph showing the relationship between the temperature of the heated body and the resonance frequency. 12... Rectifier 18... Inverter 26... Heating coil 28... Gas turbine engine 30... High frequency generator 32... Output control circuit 34... Heated object 36... Temperature sensor 38... Frequency control circuit.

Claims (3)

[Claims] (1) In a high-frequency heating gas turbine power generation device including a gas turbine engine and a high-frequency power generator directly connected to the gas turbine engine, a temperature sensor for detecting the temperature of a heated body and a temperature sensor corresponding to the detected temperature are provided. A gas turbine power generation device for high frequency heating, comprising: a frequency control circuit that changes the frequency of electric power applied to a heating coil. (2) In the power generation device according to claim (1),
A rectifier that rectifies the output of the high-frequency generator and an inverter that converts the output of the rectifier into an AC signal of a desired frequency are provided, and the output frequency of the inverter is changed based on the temperature detection signal of the heated object. A gas turbine power generation device for high frequency heating. (3) In the power generation device according to claim (1),
A gas turbine power generation device for high frequency heating, characterized in that the output frequency of the gas turbine engine is changed based on a temperature detection signal of the heated object.