JPH03280384A - Cooking apparatus with induction heating - Google Patents

Abstract

PURPOSE:To easily accomplish an induction heating cooking apparatus equipped with high performance and reliable safety by installing a plurality of temp. sensing elements in the middle of an induction heating coil using retainer which partitions between the elements with heat resistant resin. CONSTITUTION:When a cooking deep pan 17 is heated, the temp. of the pan bottom is given to temp. sensing elements 11, 12 via a cooking plate 7. When the sensing element 11 senses the set temp., and indicator lamp 16 in a temp. indicating circuit 15 is lighted up, and at a higher temp., the other sensing element 12 sends an appropriate signal to a driver circuit 14 for an induction heating coil 9 to stop current feed to the coil 9. The sensing element 12 refrains from giving an extinction signal about the indicator lamp 16 to the temp. indicating circuit 15 until the plate 7 gets a temp. below a specified level as alarm for hazard of touching the plate 7 soon after service, which might cause hard burn, and thus the safety is enhanced. The elements 11, 12 are located in groove partitioned of retainer 13 made of heat resistant resin such as liquid crystal polymer resin of aromatic polyester resin type, and carry out independent motions.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an induction heating cooker used as a domestic heating cooker.

BACKGROUND ART Conventionally, in an induction heating cooker, a temperature sensing element is fixed in contact with the bottom of a cooking plate to detect the temperature of the bottom of the pot placed on the cooking plate and adjust the temperature of the food to be cooked.
It is designed to prevent the pot from cooking, and the specific installation method is shown in Figure 4. That is, the temperature sensing element 2 provided in the central cavity of the induction heating coil 1
is inserted into a holder 3 made of a metal with good thermal conductivity such as aluminum, and the cooking plate 5 is inserted with an elastic body 4 such as a spring.
was pressed against the bottom of the

Problems to be Solved by the Invention In the configuration described above, there is no particular problem when a single temperature sensing element is installed, but it is difficult to improve performance by installing multiple temperature sensing elements and performing various temperature detections. There was a problem when trying to improve. For example, if the temperature of the bottom of the cooking pot is detected and the cooking plate 6 becomes hot due to the conductive heat of the pot, the cooking plate 6 may be heated to prevent burns caused by accidentally touching it immediately after use. In order to detect and display the temperature of the temperature detection element itself or to cover a failure of the temperature detection element itself, it is possible to add a temperature detection element 2 as a temperature detection element for a protection circuit. However, in the conventional configuration, the temperature sensing element 2 is supported by a metal holder 3, which makes it difficult to electrically and thermally insulate the elements. There were problems such as the body 3 itself being large in shape and being unable to be housed in the center of the induction heating coil 1, and the mounting of the plurality of temperature sensing elements 2 was not satisfactory as a structure.

Therefore, the first object of the present invention is to realize a structure that allows easy installation of multiple temperature sensing elements, which was difficult with the above conventional structure, and to realize an induction heating cooker with high performance and safety. That is.

A second purpose is to provide a specific material for a holder for a temperature sensing element that can withstand high temperatures and high firepower.

The third objective is to prevent the temperature sensing element from directly contacting the cooking plate and being damaged by impact, etc., and to realize a temperature sensing mechanism with fewer failures.

Means for Solving the Problems A first means of the present invention for achieving the first object is to arrange a plurality of temperature sensing elements in the center of an induction heating coil, and to arrange a plurality of temperature sensing elements between each of the plurality of temperature sensing elements. are separated by heat-resistant resin, and fixed in contact with the back surface of the plate with a holder made of heat-resistant resin.

As a second means for achieving the second object, the material of the heat-resistant resin constituting the holder of the temperature sensing element is an aromatic polyester liquid crystal polymer resin.

As a third means to achieve the third purpose, the upper surface of the temperature sensing element is held below the upper surface of the holder, and a thermally conductive material is installed in the gap between the temperature sensing element and the cooking plate. It is filled with filler.

Effect: The first means described above provides electrical and thermal insulation between multiple elements, enables independent temperature detection, and is easier to process than a metal holder, and can be formed into fine shapes. Since the temperature sensing elements themselves can be placed very close together, the temperature sensor can be miniaturized, and even if multiple temperature sensing elements are installed, they can be placed in the cavity in the center of the induction heating coil. It is possible to place the

By the second means, it is possible to construct a holder that has excellent electrical and thermal insulation properties and can withstand dry baking and high temperatures under high heat.

By the third means, the holder touches the cooking plate before the temperature sensing element sealed in glass or the like comes into direct contact with the cooking plate, so that no impact force is applied to the temperature sensing element, and the thermally conductive filling is used. The temperature of the cooking plate can be detected accurately.

Embodiments Hereinafter, embodiments of the present invention will be described based on FIGS. 1 to 3. In FIG. 1, there is a cooking plate 7 made of colored transparent ceramic on the top surface of the cooking device main body 6, and an induction heating coil 9 with a cavity 8 in the center is located at the bottom of the cooking plate 7. It is provided. 1o is a support plate for the induction heating coil 9. At the center of the induction heating coil 9 is a holder 13 made of heat-resistant resin on which a plurality of temperature sensing elements 11, 12 are mounted. Grooves 13a, 1 of the holder 13 of the temperature sensing element 11 and the temperature sensing element 12
3b, each element is separated by resin,
They are electrically or thermally insulated from each other. Now, the temperature detection element 11 is connected to the drive circuit 14 of the induction heating coil e, and controls the supply of electricity to the induction heating coil 9. The temperature detection element 12 is connected to the temperature display circuit 16 of the cooking plate 7, and lights up the display lamp 16 when the cooking plate 7 reaches a certain temperature or higher. 17 is a cooking pot placed on the cooking plate 7.

Now, the operation of this embodiment will be explained.

When the cooking pot 17 is heated, the temperature at the bottom of the pot is transmitted via the cooking plate 7 to the temperature sensing element 11.12. When the set temperature of the temperature detection element 11 is reached, the display lamp 16 of the temperature display circuit 16 of the cooking plate 7 is turned on. When the temperature of the cooking pot 17 becomes equal to or higher than the set temperature of the temperature detection element 12, a signal is sent to the drive circuit 14 of the induction heating coil 9 to stop energizing the induction heating coil 9 and stop heating. Since the temperature detection element 12 does not send a signal to the display circuit 15 and does not turn off the display lamp 16 unless the temperature of the cooking plate 7 falls below a certain level, a warning is given to prevent burns caused by touching the cooking plate 9 immediately after use. This improves safety.

In this way, each temperature sensing element operates independently, so
It would be a problem if they affected each other thermally or electrically. However, according to this embodiment, the temperature sensing elements 11 and 12 are separated from each other by heat-resistant resin and are thermally and electrically insulated, so that such problems can be prevented.

In addition, since electrical insulation with the induction heating coil 9 located nearby can be ensured by the thickness of the resin, the temperature sensing element 11
．． This has the effect that it does not take up much space to install the 12.

Therefore, the shape of the holder 13 can be easily downsized and stored in the central cavity of the induction heating coil. The structure of the present invention is very practical for installing multiple temperature sensing elements to improve safety and performance.

Now, the second means of the present invention will be explained. The holder 13 is made of a moldable, heat-resistant resin, and its specific material is an aromatic polyester resin-based liquid crystal polymer resin. This resin has a heat resistance temperature of over 300 degrees Celsius, and can withstand the high temperatures of normal cooking and cooking pots. The selection of this material is very important in realizing the structure of the holder 13 of the temperature sensing element 11.12. That is, the holder 13 serves as a support for the temperature sensing elements 11.12, and at the same time provides electrical insulation between the temperature sensing elements 11.12, or electrical insulation between the adjacent induction heating coil 9 and each temperature sensing element 11.12. It is necessary to maintain insulation at all times even at high temperatures of 200 degrees or higher.

The grade (Xydar RC-210) of the group polyether resin type liquid crystal polymer resin has been confirmed to have a durability of 100,000 hours in the US UL test, and has sufficient performance. If the heat resistance of the holder 13 is higher, the maximum set temperature of the temperature detection elements 11 and 12 can be increased, which allows for higher-temperature cooking such as iron plate cooking, high-output and high-fired cooking, and more efficient cooking. It is possible to realize a vessel.

Next, the third means of the present invention will be explained. As shown in FIGS. 2 and 3, the detailed structure of the holder 13 includes temperature sensing elements 11.
Grooves 13a and 13b into which the grooves 12 are inserted are formed.
．． The depths of a and 13b are deeper than the outer shape of the temperature sensing elements 11 and 12.

Therefore, when the temperature sensing element 11.12 is attached to the holding body 3, the upper surface 19 of the temperature sensing element 11.12 is configured to be lower than the upper surface 18 of the holder 13. The gap between the temperature sensing elements 11, 12 and the cooking plate 7 is filled with a thermally conductive filler 2° made of a highly thermally conductive silicone resin or the like.

Here, since the upper surface portion 18 of the holder 13 is placed above the upper surface of the temperature sensing element 11.12, the temperature sensing element 11.12 is not pressed against the cooking plate with strong force. Therefore, temperature sensing element 11.1
Even if the plate 2 is made of a fragile material such as glass, it will not break when it hits the cooking plate 7. At this time, the cooking plate 7 and the temperature sensing element 11.12
The thermally conductive filler 2o improves the delay in thermal response caused by the gap between the
3 configurations are possible. That is, a temperature detection mechanism with fewer failures can be realized.

Effects of the Invention As described above, the present invention, by means of the first means, makes it easy to install a plurality of temperature sensing elements in the center of an induction heating coil, and provides an induction heating system with excellent cooking performance and safety. We can provide heating cookers.

By means of the second means, it is possible to specifically configure the holder for the temperature sensing element with excellent heat resistance, and it is possible to realize a cooking device with high temperature and high heating power.

By the third means, it is possible to provide an induction heating cooker having a temperature detection structure that is less likely to malfunction or break.

[Brief explanation of drawings]

Fig. 1 is a sectional view of the induction heating cooker according to the first embodiment of the present invention, Fig. 2 is a detailed sectional view of the mounting portion of the temperature sensing element, and Fig. 3 is a perspective view of the same essential part. FIG. 4 is a sectional view of a conventional induction heating cooker. 7...Cooking plate, 9...Induction heating coil, 11.12...Temperature detection element, 13.
... Holding body, 13a, 13b... Groove of holding body, 18... Upper surface part of holding body, 19...
...Top surface part of the temperature sensing element, 20...Thermal conductive filler.

Claims (3)

[Claims] (1) It has a cooking plate, an induction heating coil, and a plurality of temperature detection elements that detect the temperature of the cooking plate, and the plurality of temperature detection elements are plated with a holder with heat-resistant resin separating each element. An induction heating cooker that is fixed on the back. (2) The induction heating cooker according to claim 1, wherein the holding body is made of an aromatic polyester resin-based liquid crystal polymer resin. (3) The holder holds the temperature sensing element so that the upper surface thereof is located below the upper surface of the holder, and the gap between the temperature sensing element and the cooking plate is filled with a thermally conductive filler. The induction heating cooker according to claim 1 or 2.