JP2983859B2 - Induction heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an induction heating cooker for inductively heating a conductive container by electromagnetic induction and heating and cooking the food in the container.

[0002]

2. Description of the Related Art FIG. 10 is a schematic side sectional view showing a conventional induction heating cooker described in Japanese Patent Application Laid-Open No. 57-107590. In the figure, reference numeral 41 denotes a box-shaped base. An opening 42 is formed on the upper surface of the base 41, and a heat-resistant holding plate 43 that holds the conductive container 44 is fixed on the back surface of the base 42 to close the opening 42.
Below the holding plate 43, a gantry 45 is attached so as to face the holding plate 43 at a predetermined distance from the holding plate 43, and on the upper surface of the gantry 43, an induction coil 46 having a plurality of conductive wires wound spirally is provided. is there. An inverter 47 for applying a high-frequency current to the induction coil 46 is provided below the mount 45.
The power supply from the induction coil 46 generates a high-frequency magnetic flux to heat the container 44 placed on the holding plate 43 by induction heating.
Cook the food in 44.

On the other hand, a flat temperature detecting plate is provided between the induction coil 46 and the holding plate 43 in order to detect the temperature of the induction coil 46.
One end of 49 is disposed substantially parallel to the induction coil 46, and the temperature of the induction coil 46 is increased by the heat of the induction coil 46 and transmitted to the other end. The temperature detecting plate 49 is made of aluminum, which is a high heat conductive material. The other end of the temperature detection plate 49 is bent so as to be located near the inverter 47, and a temperature detector such as a temperature sensing element or a thermostat is provided near the end.
There are 50 installed. A fan 48 is mounted on the side surface of the base 41 so as to face the inverter 47, and the inverter 47 is cooled by the fan 48.

The temperature detector 50 detects the temperature of the induction coil 46 transmitted by the temperature detection plate 49, and stops the output of the inverter 47 via the lead wire 51 when the temperature exceeds a predetermined temperature. It has become. Also a temperature detector
50 detects the ambient temperature of the inverter 47, and when the ambient temperature becomes equal to or higher than a predetermined value, assuming that the inverter 47 is not cooled down due to a failure of the fan 48,
Stop output of 47.

[0005]

However, in the conventional induction heating cooker, since the temperature detector is attached to the plate-like temperature detection plate, the temperature detector contacts the temperature detection plate only on one side. And the detection sensitivity is low.

On the other hand, when a temperature detecting plate is made of a material having a low electric conductivity, such as aluminum, if the temperature detecting plate is disposed in a portion where a magnetic field of the induction coil is strongly generated, the temperature detection plate itself is induction-heated, and the temperature detection plate itself is heated. It cannot conduct heat accurately. Therefore, the heat conduction plate is arranged at a predetermined distance from the induction coil to reduce the influence of the magnetic field generated by the induction coil. However, in such an arrangement, the heat of the induction coil is not accurately transmitted, and it takes a long time to conduct the heat, and the induction coil may be overheated and damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to form a concave portion for fitting a temperature detector in a heat conducting plate, thereby increasing the sensitivity of detecting an induction coil temperature. An induction heating cooker is provided. In addition, an induction coil is provided on one side of the gantry, and a magnetic body is provided on the other side. By disposing a heat conducting plate on the side of the magnetic body opposite to the gantry, the magnetic field generated by the induction coil is affected Another object of the present invention is to provide a highly safe induction heating cooker that accurately detects the temperature of an induction coil in a short time.

[0008]

According to the first aspect of the present invention, there is provided an induction heating cooker in which one end of a heat conducting plate is arranged near an induction coil for generating a magnetic field, and the other end is separated from the induction coil. In an induction heating cooker wherein the temperature of the heat conductive plate is detected by a temperature detector mounted near the other end of the heat conductive plate, the heat conductive plate has a temperature detector attached portion. And a concave portion for fitting the temperature detector is formed.

An induction heating cooker according to a second invention is characterized in that, in addition to the first invention, a heat conduction member for covering the recess is provided.

An induction heating cooker according to a third aspect of the present invention is provided with an induction coil on one surface of a gantry and a magnetic material on another surface.
One end of the heat conductive plate is disposed near the induction coil, and the other end is separated from the induction coil, and the temperature of the heat conductive plate is detected by a temperature detector mounted near the other end of the heat conductive plate. In the induction heating cooker configured to detect the heat conductive plate, the heat conductive plate includes a portion disposed on a side opposite to a mount of the magnetic body, and a portion extending therefrom to the induction coil. It is characterized by doing.

[0011]

In the induction heating cooker according to the first invention, one end is disposed near the induction coil, and the other end is disposed near the other end of the heat conduction plate separated from the induction coil. Since the concave portion for fitting the detector is formed, the area of the temperature detector fitted in the concave portion to receive heat from the heat conducting plate increases. Further, the recess facilitates the positioning of the temperature detector when the temperature detector is mounted on the heat conductive plate.

[0012] In the induction heating cooker according to the second aspect of the present invention, the temperature detector also receives heat from the heat conductive member covering the recess formed in the heat conductive plate, so that the heat receiving area of the temperature detector further increases. Further, the temperature detector can be fixed to the heat conduction plate by the heat conduction member. As a result, the temperature detector is easily fixed to the heat conducting plate without screwing or the like.

[0013] In the induction heating cooker according to a third aspect of the present invention, a magnetic body is provided on one side of the gantry, and an induction coil is provided on the other side, and the heat conductive plate is disposed on the opposite side of the magnetic body from the gantry. Therefore, it is not affected by the magnetic field generated by the induction coil.
In addition, the influence of the induction coil on the portion extending from the heat conductive plate to the induction coil is sufficiently reduced by the magnetic material. Therefore, by generating a strong magnetic field of the induction coil and arranging the heat conduction plate in a part where overheating is likely to occur, the heat conduction plate conducts the heat of the induction coil accurately in a short time, and the temperature detector detects the heat. Is detected.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings showing the embodiments. FIG. 4 is a partial side sectional view showing an induction heating cooker according to the present invention, wherein 1 is a base. An opening 2 is formed in the upper part of the base 1, and a frame member 3 is fixed around the opening 2. A top plate 4 for holding a heat-resistant and conductive container is mounted on the frame member 3 so as to close the opening 2, and cushioning members 5 and 5 are provided between the top plate 4 and the frame member 3. It is interposed. Below the top plate 4, a plate-like mount 6 is mounted parallel to and at a predetermined distance from the top plate 4. On the mount 6, an induction coil having a plurality of spirally wound conductors is provided. . A temperature detecting device 10 including a temperature detecting plate 11 and a temperature detector, which will be described later, is attached to an end of the gantry 6, and the temperature of the induction coil 7 is detected by the temperature detecting device 10.

An electric device 8 including an inverter and the like is provided at the bottom of the base 1, and a high-frequency current is supplied from the electric device 8 to the induction coil 7. As a result, the induction coil 7 generates a high-frequency magnetic field to induction heat the container placed on the top plate 4, and the food in the container is heated and cooked. A plate-like heat radiation fin 8a protrudes from the upper part of the electrical equipment 8,
A cooling fan 9 is mounted on a side surface of the base 1. The outside air sucked by the cooling fan 9 is cooled while contacting the radiating fins 8a in the longitudinal direction thereof, and is discharged from the surface of the base 1 facing the cooling fan 9.

FIG. 5 is a plan view of the gantry 6 shown in FIG. One end of a substantially crank-shaped band-shaped temperature detecting plate 11 (see FIG. 4) is fixed in the vicinity of the edge on the gantry 6, and the other end of the temperature detecting plate 11 is It is located almost in the center. The material of the temperature detecting plate 11 is a material having high electric conductivity such as copper or aluminum. Temperature detection plate
A rectangular pressing member 18 is fixed on the vicinity of the other end of 11, and the pressing member 18 is in contact with the top plate 4 (see FIG. 4) to press the other end of the temperature detecting plate 11 against the induction coil 7. It has become. An insulating sheet 25 is interposed between the induction coil 7 and the temperature detection plate 11, and the temperature detection plate 11 conducts heat without shorting the induction coil 7.

The fixed end of the temperature detecting plate 11 is provided with a fitting portion 15 formed so as to have a U-shape in a side view, and the fitting portion 15 is provided with a temperature detector such as a temperature sensing element or a thermostat. The 16 temperature sensing portions 17 are fitted and fixed by the fixture 20. The heat conducted from the induction coil 7 by the temperature detection plate 11 is detected by the temperature sensing part 17 of the temperature detector 16, and when the temperature is higher than a predetermined temperature, the temperature detector 16 supplies power to the induction coil 7. It is designed to stop.

FIG. 1 is an exploded perspective view of the temperature detecting device.
2 and 3 are a plan view and a side view showing the temperature detecting device. The fixing part 12 of the temperature detecting plate 11 is provided with a screw hole 12a, and a screw is inserted into the screw hole 12a so as to be fixed to the gantry. A connecting portion 13 and a main body 14 inclined at a predetermined angle extend from the fixing portion 12, and the main body 14 and the fixing portion 12 are inclined.
And are parallel. In the vicinity of the connecting portion 13 of the main body 14, a fitting portion 15 formed so as to have a substantially U-shape in side view is provided over the entire width of the main body 14, and a rectangular shape is provided near the end of the main body 14. The pressing member 18 is fixed. The temperature sensing part 17 of the temperature detector 16 is fitted to the fitting part 15, and the temperature sensing part 17 is
Is fixed to the main body 14.

The fixing device 20 has a rectangular plate-shaped intermediate portion 21 having substantially the same length as the length of the fitting portion 15 in the longitudinal direction and having a dimension larger than the width of the fitting portion 15. It has feet 22, 22 provided at both ends. The two feet 22, 22 are bent at a right angle, and the fixture 20 is substantially U-shaped when viewed from the front. Note that the fixture 20 is made of the same material as the temperature detection plate 11. Then, the intermediate part 21 of the fixture 20 is brought into contact with the temperature sensing part 17 of the temperature detector 16 fitted to the fitting part 15 of the main body 14, and the ends of both feet 22, 22 are connected to the fitting part 15. The temperature detector 16 is fixed to the temperature detection plate 11 by being bent to the back. Thereby, the temperature sensing part 17 of the temperature detector 16 receives heat from six directions. Further, the temperature detector 16 can be easily fixed to the temperature detection plate 11 without screwing or soldering.

FIG. 6 is a partial sectional side view showing another embodiment of the present invention, in which a temperature detecting device 10 is mounted on the lower surface of a gantry 6. In the figure, parts corresponding to those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. A temperature detecting plate 11 of a temperature detecting device 10 has a screw 11 on the lower surface of the base 6 having a plurality of holes.
The temperature detector 16 is fitted inside a fitting portion 15 provided on the temperature detection plate 11 and fixed by a fixture 20. An extension 19 is provided upright on the main body 14 of the temperature detection plate 11, and the extension 19 penetrates through a hole in the gantry 6 and passes through an insulating sheet 25 to the induction coil 7 mounted on the gantry 6. Abuts.

FIG. 7 is a perspective view showing the temperature detecting device of FIG. The fixing part 12 of the temperature detecting plate 11 is provided with a screw hole 12a, and a screw is inserted into the screw hole 12a so as to be fixed to the gantry. Communication part 13 of body 14 of temperature detection plate 11
In the vicinity, there is provided a fitting portion 15 which is formed in the width direction of the main body 14 so that the side view thereof has a substantially U shape. A temperature sensing part 17 of a temperature detector 16 is fitted to the fitting part 15, and the temperature detector 16 is fixed to the main body 14 by a fixture 20. An arm 19a of an extension 19 is provided upright on the edge of the main body 14 opposite to the connecting portion 13, and a contact portion abutting on the induction coil is provided at the tip of the arm 19a.
19b is provided.

FIG. 8 is a plan view showing the lower surface of the gantry 6 shown in FIG. 6, and FIG. 9 is a partial sectional view of FIG. A plurality of rims 6a, 6a are radially provided from the center of the gantry 6 on the lower surface of the gantry 6.
a, ... are formed at equal intervals, and the rim 6
Small rims 6b, 6b,... are formed in the middle between a, 6a,. These rims 6a, 6a, ... and small rims 6b,
Are arranged in portions surrounded by 6b,..., Respectively. The magnetic bodies 31, 31,.
The electrical equipment 8 (see FIG. 6) installed below the induction coil 7 is shielded from the induction magnetic field.

The fixing part 12 of the temperature detecting plate 11 is fixed to the lower edge of the gantry 6 by screws 11a. The main body 14 of the temperature detecting plate 11 is disposed along a magnetic body 31 provided in a portion surrounded by the rim 6a, and the temperature detecting plate 11 is not affected by the magnetic field of the induction coil 7 by the magnetic body 31. Has become. Thereby, since the temperature detection plate 11 can use an aluminum material having high thermal conductivity, heat conduction is high,
The time required for detecting the temperature of the induction coil 7 is short. Body 14
Is located at the approximate center of the radius of the induction coil 7, and an extension 19 extending to the induction coil 7 is provided near the other end. The extension part 19 penetrates a hole formed in the gantry 6,
It is in contact with the induction coil 7 via the insulating sheet 25, and conducts the heat of the induction coil 7 to the main body 14. As shown in FIG. 8, since the extension 19 is disposed near the magnetic body 31, the effect of the magnetic field of the induction coil 7 is sufficiently reduced by the magnetic body 31, and the extension 19 is heated by the induction coil 7. To convey exactly.

In the present embodiment, the shape of the fitting portion provided on the temperature detecting plate is substantially U-shaped when viewed from the side. However, the present invention is not limited to this. It goes without saying that an appropriate shape may be used according to the shape of the detector.

[0025]

As described in detail above, in the induction heating cooker according to the first aspect of the present invention, the heat receiving area of the temperature detector is increased, so that the temperature detection sensitivity of the heat conduction plate and the induction coil is improved. In addition, since the positioning is easy when the induction coil is mounted on the heat conduction plate, the assembling efficiency is improved.

In the induction heating cooker according to the second invention, the heat receiving area of the temperature detector is further increased, and the temperature detection sensitivity of the heat conduction plate and the induction coil is further improved. In addition, since the temperature detector can be easily fixed to the heat conduction plate without screwing or the like, the work of fixing the temperature detector to the heat conduction plate is easy to automate, and the fixing work efficiency is improved. .

In the induction heating cooker according to the third aspect of the present invention, the heat conduction plate is placed in a portion where the induction coil generates a strong magnetic field and is likely to be overheated. Since the heat of the induction coil is conducted and detected by the temperature detector, the present invention has excellent effects such as prevention of overheating of the induction coil and high safety.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a temperature detecting device.

FIG. 2 is a plan view showing a temperature detection device.

FIG. 3 is a side view showing a temperature detecting device.

FIG. 4 is a partial side sectional view showing an induction heating cooker according to the present invention.

FIG. 5 is a plan view of the gantry shown in FIG. 4;

FIG. 6 is a partial side sectional view showing another embodiment of the present invention.

FIG. 7 is a perspective view showing the temperature detecting device of FIG. 6;

FIG. 8 is a plan view showing the lower surface of the gantry shown in FIG.

FIG. 9 is a partial sectional view of FIG.

FIG. 10 is a schematic side sectional view showing a conventional induction heating cooker.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 4 Top plate 6 Stand 7 Induction coil 10 Temperature detection device 11 Temperature detection plate 12 Fixed part 13 Communication part 14 Main body 15 Fitting part 16 Temperature detector 17 Temperature sensitive part 20 Fixture

Claims (2)

(57) [Claims] An end of a heat conducting plate is arranged near an induction coil for generating a magnetic field, and the other end is separated from the induction coil, and a temperature attached near the other end of the heat conducting plate. In the induction heating cooker wherein the temperature of the heat conducting plate is detected by a detector, the temperature detecting portion is attached to a portion of the heat conducting plate where the temperature detector is attached.
Forming a recess for fitting the ejector and covering the recess
An induction heating cooker comprising a guide member . 2. An induction coil on one side of the gantry and another on the other side.
A magnetic body is provided, and a heat conductive plate is provided near the induction coil.
One end is arranged, and the other end is from the induction coil.
Insulated and attached near the other end of the heat conducting plate
The temperature of the heat conduction plate is detected by the temperature detector.
In the induction heating cooker, the heat conductive plate is disposed on the opposite side of the magnetic material base.
A part and a part extending from it to the induction coil
An induction heating cooker comprising: