JPS5933952Y2 - electric stove - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electric stove that uses a positive characteristic star heater to perform heating using radiant heat and convection heat.

Conventional electric stoves that provide both radiant heating and convection heating require separate heating elements for radiation and convection, resulting in a complicated structure. There was a risk of burns if a person came into contact with the heating element or the protective gear for the heating element even for a short time when taking warmth.

The purpose of the present invention is to improve the above-mentioned drawbacks and to obtain a highly safe electric stove that has a simple structure and is capable of convection heating and low-temperature radiation heating by using a positive characteristic heater.

The key point of this invention is that a finned heat sink for convection heating is fixed to one heat dissipation surface of a flat positive temperature coefficient thermistor heater, and the other surface is used for radiant heat dissipation and is electrically insulated from the heat dissipation body. This is an electric stove in which a heat-generating part is fixed to the outside through an electrical insulator with good thermal conductivity, and is housed and fixed to the inside of a heat radiator.

Embodiments of the present invention will be explained with reference to the drawings.

In Figures 1, 2, and 3, 1 is a positive temperature coefficient thermistor heater, 2 is a finned heat sink, 3 is a heat sink, 4 and 5 are electrical insulators with good thermal conductivity, and 6 is an external heat sink. ,
7 is an electrode plate, 8 is dustproof paper, edge cover, 9 is an air suction part,
10 is an air discharge part, 11 is an air path, and 12 is a leg.

That is, in the enlarged plan cross-sectional view of the main part of the heat generating part in FIG. In addition to dissipating heat to the positive temperature coefficient thermistor heater 1, the two heating bodies 2 and 3 also serve as electrodes for feeding power to the positive temperature coefficient thermistor heater 1.

Further, the heat sink 2 with fins guides the heat from the PTC heater 1 to the fin portion and dissipates convection heat, and the heat sink 3 is fixed to the outside of the heat sink 6 via an electrical insulator 4 with good heat conduction. It has the role of dissipating the heat from the positive temperature coefficient thermistor heater 1 from the surface of the heat sink 60 as radiant heat.

Here, when the convective airflow passes near the heat sinks 2 and 3, dust in the air may adhere between the heat sinks/electrodes having different polar potentials and damage the insulation, so a dustproof cover 8 is provided. Ru.

In the embodiment shown in FIG. 1, the heat generating parts made of the positive temperature coefficient thermistor heater 1 and the heat radiator are provided at two places on the inside of both sides of the external heat radiator 60, but if they are provided only on one side instead of on both sides, only one side will be used. It is possible to have a structure in which only the surface of the heat sink dissipates radiant heat.

In addition, in order to increase the heat transfer to the external heat sink 6, the thermal resistance of the heat sink 3 as well as the electric insulator 4 is reduced, so when using the electric insulator 4 with high thermal resistance, the positive characteristic sensor □
A heat sink 3 with good heat conduction and a large heat dissipation area is used between the star heater 1 and the electric insulator 40, or in the case of an electric insulator with low thermal resistance, an electrode plate 7 is used as shown in the embodiment of FIG. Alternatively, an electrical insulator 5 may be provided directly between the positive temperature coefficient thermistor heater 1 and the external heat sink 6.

In this way, the positive temperature coefficient thermistor heater 1 is placed between the finned heat radiator 2 and the outside (the heat radiator 6 is sandwiched and fixed via the electrical insulator 4.5, and is housed in the heat radiator 6, so that the air suction part 9 The inflowing air is warmed by the finned heat radiator 2 and discharged from the air discharge section 10.

On the other hand, from the outside (from the 6th side of the heat sink, the positive temperature coefficient thermistor heater 1
Because it is heated by conductive heat from the inside, it is dissipated as radiant heat.

If the Curie temperature of the positive temperature coefficient thermistor heater to be used is chosen to be the generally used value of about 150 to 250 degrees Celsius, the temperature will not rise to red-hot temperatures, so naturally the surface temperature of the external heat sink will be the same. It is safe because it is below the temperature, and radiant heat with a low temperature and soft feeling of warmth can be obtained.

Furthermore, if the heat generation operating point of the positive temperature coefficient thermistor is selected to be one Curie temperature or higher, the input power increases and the amount of heat radiation increases when the ambient temperature decreases, which is a convenient characteristic for a heater.

In addition, by installing a blower in the air passage 11 to forcefully send air to the finned heat radiating body 2, an even larger amount of heat radiation can be obtained.

As described above, according to the present invention, radiant heat and convection heat can be obtained at the same time by housing and fixing the PTC thermistor heater to which the finned heat radiator is fixed outside, and the PTC thermistor heater has a simple structure and can obtain convective heat at the same time. You can get an electric stove that takes full advantage of the safety features of the electric stove and provides comfortable warmth.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the entire embodiment of the present invention, and FIGS. 2 and 3 are enlarged plane sectional views of the main parts of the heat generating part. (Viewed from direction A in Figure 1). 1...Positive characteristic thermistor heater, 2...
・Finned heat sink, 3... Heat sink, 4, 5...
...Electrical insulator, 6...External heat radiator.

Claims (1)

[Scope of utility model registration request] A positive characteristic sensor □ An electrode/finned heat radiator 2 is fixed to one heat radiating surface of the star heater 1, and an electrode/finned heat radiator 2 is fixed to the other heat radiating surface via an electrode/heat radiator 3 or an electrode plate I which also serves as a radiator. Electrical insulator 4 with good thermal conductivity between heat sink 6
This electric stove has a heat-generating part which is fixedly fixed via a heat generating part 5 and housed inside an external heat radiator having an air suction part 9 and an air discharge part 10.