JPH0241158B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating and heat-insulating container for an electromagnetic cooker used in general households.

Conventional Structures and Problems Conventionally, vacuum insulated thermos flasks have been used as heat-insulating containers, and there is also a product called a jar pot that can heat and keep warm. The former is cordless and easy to use, but it does not have a heating function.
The latter has a heating function, but is corded and is therefore less convenient to use.

Purpose of the Invention The present invention provides a cordless heating and heat-insulating container that can be used in combination with an electromagnetic cooker.

Structure of the Invention The present invention includes an electromagnetic induction coil that induces an AC high frequency voltage by magnetic flux from a heating coil for electromagnetic cooking, a casing in which the electromagnetic induction coil is provided at the bottom,
The structure includes a metal container provided inside the casing and thermally insulated from the outer shell thereof, and a heating coil provided around the outer periphery of the metal container to which an AC high frequency voltage is supplied from the electromagnetic induction coil. be.

DESCRIPTION OF THE EMBODIMENTS Figure 1 is a partially cutaway structural diagram showing the arrangement of major parts, and Figure 2 is an electrical wiring diagram. Items with the same numbers as those in Figure 1 are the same parts as in Figure 1. It is. In FIG. 1, reference numeral 1 denotes a heating and heat-insulating container placed on a normal heating plate of an electromagnetic cooker 2, which includes a cylindrical outer shell 3, a metal container 4 provided inside the outer shell 3,
A non-metallic bottom plate 5, a heating coil 6 (hereinafter simply coil 6) wound around a part of the metal container, a thermostat 7 also attached to a part of the container, and the bottom plate 5 mentioned above.
A record-shaped electromagnetic induction coil 8 provided close to the
(hereinafter simply referred to as coil 8), a non-conductive electromagnetic body (ferrite core) 9 and a It is composed of a heat insulating material 10 provided around the outer periphery of the container 4 described above. Second
The figure shows an electrical connection diagram of the device shown in FIG.
are connected to both ends of the heating coil 6.

In the above configuration, the heating and heat-insulating container 1 is placed so that the coil 8 provided at its bottom faces the heating coil (not shown) of the electromagnetic cooker 2, and when the electromagnetic cooker 2 is brought into an excited state, the electromagnetic The magnetic flux from the heating coil of the cooker induces an AC high frequency voltage in the coil 8, and when the thermostat 7 is closed, the coil 6 is excited with a high frequency current and the container 4 is heated by the eddy current. As a result, the contents of the container 4, such as water, are heated toward a boiling state, but if the opening operating point of the thermostat is set at approximately 95°C, the thermostat 7 will open when the boiling state is reached. In this state, since the capacitor 11 is inserted directly into the coil 6, the energy that the coil 6 gives to the container 4 is reduced. That is, the capacitance value of the capacitor 8 is determined so as to supply enough energy to compensate for the heat loss lost from the container 4. Moreover, since the impedance element inserted in series with the coil 6 has sufficient impedance to shift the resonance point, the above-mentioned low heat generation and compact capacitor can be used. However, it is difficult to maintain the open circuit state of the thermostat 7 permanently, and when the temperature of the container 4 falls and reaches the closing operating point of the thermostat 7, for example 90°C, it becomes heated again and the above operation is repeated. It is something that can be done.

In response to the above heating and heat retention operations, the heat retention lamp 12 and the heat lamp 13 are turned on.

Note that switching the power from heating to heat retention and maintaining the heat retention state, that is, temperature control, can also be performed by other means. That is, a DC power source is formed from the coil 8 using a rectifier smoothing capacitor (not shown (the same applies hereafter)), a temperature sensor such as a thermistor is used in place of the thermostat 7, a relay is driven by a transistor circuit, and the power is supplied to the coil 6. However, the configuration shown in the embodiment shown in FIG. 2 is the simplest and therefore can be manufactured at low cost.

Note that since the above-mentioned capacitor 11 is for the purpose of suppressing heating energy in a heat-retaining state, it goes without saying that it may be an inductance element, that is, an impedance element.

Effects of the Invention As described above, the present invention includes an electromagnetic induction coil that induces a high-frequency voltage when placed on an electromagnetic cooker, and a thermally insulated metal container that is heated by the electromagnetic induction coil that is powered by the electromagnetic induction coil. Since it is equipped with a heating coil, it can be used in combination with an electromagnetic cooker to provide a cordless heating and heat-insulating container. In addition, the heating and insulating container with this configuration can be moved freely when pouring hot water, and
By placing the container on an electromagnetic cooker under normal conditions, hot water can be stored at all times, improving the usability of the heating and heat-insulating container. Furthermore, the power supply to the heating coil is controlled by a thermostat and an impedance element, and when keeping warm, the impedance works to supply the heating coil with electric power equivalent to the amount of heat loss, so it is possible to improve heat retention.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway structural diagram showing the arrangement of essential parts of the present invention, and FIG. 2 is an electrical wiring diagram thereof. 8... Electromagnetic induction coil, 4... Metal container, 6
...Heating coil, 7...Thermostat, 11...
...Impedance element.

Claims (1)

[Scope of Claims] 1. An electromagnetic induction coil that induces an AC high-frequency voltage by magnetic flux from a heating coil of an electromagnetic cooker, a casing in which this electromagnetic induction coil is provided at the bottom, and an outer shell and a heat source inside the casing. 1. A heating and heat-insulating container for an electromagnetic cooker, comprising: a metallic container that is insulated from the outside; and a heating coil that is provided around the outer periphery of the metallic container and is supplied with an AC high-frequency voltage from the electromagnetic induction coil. 2. The electromagnetic coil according to claim 1, wherein the electromagnetic induction coil and the heating coil are connected via a thermostat attached to a part of the metal container, and impedance elements are connected to both ends of the thermostat. A heating and insulating container for cooking utensils.