JP2002267173A - High-frequency heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a high-frequency heater from making abnormal heating, etc., by detecting such abnormal use of the heater that the heater makes high-frequency heating while an object to be heated is not put in the heating chamber of the heater. SOLUTION: The high-frequency heater is provided with the heating chamber 1, a rotary plate 2, a surface temperature measuring instrument 8, and a controller 6. The measuring instrument 8 measures the surface temperatures of the rotary plate 2, and the object 3 to be heated put on the plate 8, or the bottom plate of the heating chamber 1. Consequently, the heater can discriminate the presence/absence of the object 3 on the plate 3 from the characteristics of the rising curves of the surface temperatures and, when the heater discriminates that the object 3 does not exist on the plate 8, stops the high-frequency heating. The energy consumption of the heater by abnormal use can be prevented and the service lives of parts can be prolonged by preventing the occurrence of abnormal heating in the heating chamber 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents abnormal use of a high-frequency heating device, and particularly detects abnormal use when high-frequency heating is performed without placing an object to be heated such as food in a heating chamber. The high-frequency heating is stopped.

[0002]

2. Description of the Related Art A high-frequency heating apparatus has been developed in which a high-frequency energy supplied from a high-frequency generation source to a heating chamber is increased year by year for the purpose of shortening cooking time and saving energy. When high-frequency heating is performed on an object to be heated such as food without entering the heating chamber, the large high-frequency energy is absorbed into the heating chamber very little, and is absorbed by functional components in the heating chamber such as a rotating dish. That is, the temperature of the components in the heating chamber rises, and the life of the components is shortened.

A conventional high-frequency heating apparatus generally has, for example, a structure shown in FIG.

In FIG. 9, 1 is a heating chamber, 2 is a rotating dish,
Reference numeral 3 denotes a heated object such as food, 4 denotes a weight detection sensor, and 5 denotes a table for transmitting the weight of the heated object 3 on the rotating plate 2 to the weight detection sensor 4. At the same time as the start of cooking, the weight of the object to be heated 3 placed on the rotating plate 2 is transmitted to the weight detecting sensor 4 via the table 5 supporting the rotating plate 2, and the weight detecting sensor 4
, The weight signal of the object to be heated 3 is transmitted to the control device 6.
At this time, if the object to be heated 3 is subjected to high frequency heating without entering the heating chamber 1, the controller 6 determines from the weight signal of the weight detection sensor 4 that the object to be heated 3 is not on the rotating plate 2, and performs the high frequency heating. Stop.

[0005]

However, in the above-described conventional configuration, especially when the weight of the object to be heated 3 is light, the weight transmitted to the weight detecting sensor 4 is small, and as a result, the weight transmitted from the weight detecting sensor 4 is small. The control device 6 determines from the signal that the object to be heated 3 is not placed on the rotating plate 2 and sometimes stops the high-frequency heating. In other words, there is a case where even if an attempt is made to cook a light object 3 to be heated, it is stopped without being heated.

The weight of the object to be heated 3 is transmitted to the weight detection sensor 4 via the table 5 supporting the rotating plate 2, so that the weight of the object 3 and the rotating plate 2 is supported at one axis of the table 5. are doing. In particular, when the heavily heated object 3 is placed on the end of the rotating dish 2, the heated object 3 and the rotating dish 2 continue to rotate while tilting about the axis of the table 5. There was a problem of falling down due to the inclination and giving anxiety to the appearance.

The present invention solves the above-mentioned conventional problems, and does not judge the presence or absence of the object to be heated 3 in the heating chamber 1 by the conventional method, but rather uses a rotating plate 2 after high-frequency heating for a certain time.
Alternatively, it is another object of the present invention to provide a high-frequency heating device having a function of judging from the surface temperature of the object to be heated 3 and preventing abnormal use.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, a high-frequency heating apparatus according to the present invention comprises a heating chamber for storing food, a rotating dish on which the food is placed, and a surface temperature on the rotating dish. Surface temperature measurement devices such as infrared sensors
Equipped with a control device that can perform high-frequency heating freely, determines the presence or absence of the object to be heated from the surface temperature of the rotating dish measured by the surface temperature measuring device or the surface temperature of the object to be heated, and controls the high-frequency heating by the control device It is configured.

Thus, even when the weight of the object to be heated is light, high-frequency heating is performed for a certain period of time, and the difference in the surface temperature caused by the difference in the dielectric constant between the rotating plate 2 and the object to be heated 3 is measured by a surface temperature measuring device. However, since the presence or absence of the object to be heated is determined, the problem of a determination error due to a slight weight of the object to be heated can be solved. Further, since the present invention does not judge the presence or absence of the object to be heated by weight, it is not necessary to support the weight of the object to be heated or the rotating dish at one place. The inclination of the dish can be eliminated.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is characterized in that a heating chamber for accommodating food is provided, and a disk-shaped glass, ceramic or polypropylene having a low dielectric constant, on which the food is loaded and rotated in the heating chamber. A rotating dish made of resin, a non-contact type surface temperature measuring device for monitoring the surface temperature on the rotating dish, and a control device capable of freely performing high-frequency heating, wherein the surface temperature measuring device comprises a rotating dish and an object to be heated. The surface temperature of the object is measured, and the presence or absence of the object to be heated is determined from the difference in the detected surface temperature.If the object to be heated such as food is not in the heating chamber, the high-frequency heating is stopped by the control device, and the components in the heating chamber are stopped. Can be protected.

[0011] The invention described in claim 2 is particularly advantageous in claim 1.
A hole is provided radially from the center of the rotating plate described in, and the surface temperature measuring device periodically measures the surface temperature of the bottom surface of the heating chamber through the hole of the rotating plate by rotating the rotating plate so that the entire rotating plate is covered. Even if a large object to be heated is heated by high frequency, it is not determined that there is no object to be heated, and the accuracy of determining the presence or absence of the object to be heated can be improved.

[0012]

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

(Embodiment 1) FIG. 1 shows a configuration diagram of a high-frequency heating apparatus according to a first embodiment of the present invention.
Note that the same reference numerals as those of the conventional example have the same structure, and a detailed description will be omitted.

In FIG. 1, reference numeral 1 denotes a heating chamber, in which a rotating plate 2 is housed, and the rotating plate 2 is rotated by a turntable motor 7 attached to the bottom of the heating room 1, and
The surface temperature measuring device 8 is attached at a position where the surface temperature of the rotating plate 2 can be measured through a hole provided in the surface of the rotating plate 2. The heating chamber 1 is provided with a high-frequency generator 9, which is controlled by the controller 6 in accordance with an input signal from the surface temperature measuring device 8 or the operation panel 10.

The operation and operation of the high-frequency heating apparatus configured as described above will be described below. First, the object to be heated 3 is placed on the rotating plate 2 in the heating chamber 1 and the operation panel 10
By pressing the start button, the high-frequency heating is started. The signal of pressing the start button is input to the control device 6, and the high-frequency generating means 9, the surface temperature measuring device 8, and the turntable motor 7 are controlled in conjunction (STEP).
1). As described above, when the object to be heated 3 is placed on the rotating plate 2 and heated by high frequency, the surface temperature measured by the surface temperature measuring device 8 is changed by the dielectric constant every rotation cycle of the turntable motor 7 as shown in FIG. The temperature of the object to be heated 3 having a large value is high, and the rotating dish 2 made of a material having a low dielectric constant changes at a low temperature. The control device 6 detects this periodic temperature difference (STEP
2) It is determined that the object to be heated 3 exists on the rotating plate 2 (ST
EP4), high-frequency heating is continued (STEP6). Conversely, when the start button of the operation panel 10 is pressed without placing the object 3 on the rotating plate 2, high-frequency heating is started, but the surface temperature measured by the surface temperature measuring device 8 is as shown in FIG. It keeps increasing gradually without any periodic changes. When the control device 6 detects that there is no such periodic change and the tendency to continue increasing, it is determined that the object to be heated 3 does not exist on the rotating plate 2 and the high-frequency heating is stopped (STEP 5).

As described above, in this embodiment, the presence or absence of the object to be heated 3 is determined by measuring the surface temperature difference between the rotating plate 2 and the object to be heated 3 by the surface temperature measuring device 8.
When no is present, high-frequency heating is stopped, energy consumption due to abnormal use is prevented, and the life of components in the heating chamber 1 can be extended.

(Embodiment 2) FIG. 5 is an external perspective view of a rotating plate according to a second embodiment of the present invention. Note that the same reference numerals as those in the conventional example and the first embodiment have the same structure, and a detailed description thereof will be omitted.

The rotating plate 2 has a configuration in which holes are provided radially from the center toward the periphery. When the object 3 to be heated is placed on the rotating plate 2 and heated by high frequency (STEP 11), the surface temperature is measured by the surface temperature measuring device 8. As shown in FIG. 6, the temperature of the heated object 3 having a large dielectric constant is high and the rotating plate 2 made of a material having a low dielectric constant is low at every rotation cycle of the turntable motor 7 as shown in FIG. 6 (STEP 12). . By detecting the periodic temperature difference by the control device 6, it is determined that the object 3 is present on the rotating plate 2 (STEP 14), and the high-frequency heating is continued (STEP 17). Conversely, when the start button of the operation panel 10 is pressed without placing the object 3 on the rotating plate 2, high-frequency heating is started, but the surface temperature measured by the surface temperature measuring device 8 is as shown in FIG. The surface temperature of the bottom surface of the heating chamber 1 is periodically input through a hole provided in the rotating plate 2. Heating room 1
The bottom surface has a lower dielectric constant than the rotating plate 2 and is less likely to rise in temperature due to high-frequency heating than the rotating plate 2, so the periodic temperature difference between the high-temperature rotating plate 2 and the bottom surface of the low-temperature heating chamber 1 is controlled. The apparatus 6 detects that the object 3 to be heated is not present on the rotating plate 2 (STEP 15), and stops the high-frequency heating (STEP 16).

As described above, in this embodiment, the presence or absence of the object 3 is determined by measuring the surface temperature difference between the rotating plate 2, the object 3 and the bottom surface of the heating chamber 1 by the surface temperature measuring device 8. When the object 3 to be heated does not exist, the high-frequency heating is stopped, energy consumption due to abnormal use is prevented, and the life of components in the heating chamber 1 can be extended.

[0020]

As described above, according to the high-frequency heating device of the present invention, the surface temperature of the rotating plate and the object to be heated are measured by the surface temperature measuring device at the same time as the start of the high-frequency heating, so that the rotating plate is placed on the rotating plate. The presence or absence of the object to be heated can be determined,
If there is no object to be heated on the rotating dish, stop high-frequency heating,
The life of components can be extended by preventing waste of energy due to abnormal use and preventing abnormal heating in the heating chamber.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a graph of a surface temperature when an object to be heated is present in the high-frequency heating device.

FIG. 3 is a graph of a surface temperature when the object to be heated does not exist in the high-frequency heating device.

FIG. 4 is a flowchart of a control method of the high-frequency heating device.

FIG. 5 is an external perspective view of a rotating plate of the high-frequency heating device according to the second embodiment of the present invention.

FIG. 6 is a graph of a surface temperature when an object to be heated is present in the high-frequency heating device.

FIG. 7 is a graph of the surface temperature when the object to be heated does not exist in the high-frequency heating device.

FIG. 8 is a flowchart of a control method of the high-frequency heating device.

FIG. 9 is a configuration diagram of a conventional high-frequency heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating room 2 Rotating dish 3 Object to be heated 6 Control device 8 Surface temperature measuring device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 6/78 H05B 6/78 A

Claims (2)

[Claims] 1. A heating chamber for storing food, a disk-shaped rotating plate made of resin such as glass or ceramic or polypropylene having a low dielectric constant, on which an object to be heated is placed and rotated in the heating chamber; A high-frequency heating device including a non-contact type surface temperature measuring device for monitoring the surface temperature on a plate and a control device for freely performing high-frequency heating. 2. The rotating dish according to claim 1, wherein the rotating dish has a hole radially from the center, and the rotation of the rotating dish causes the surface temperature measuring device to periodically measure the surface temperature of the bottom surface of the heating chamber through the hole of the rotating dish. High frequency heating equipment.