JPH042095A - High frequency heating device - Google Patents

Abstract

PURPOSE:To perform proper heating in compliance with the amount of object to be heated and eliminate wasteful use of electric power by setting the heating output for warm-keeping using a output setting means, and adjusting the heating output with a controlling means on the basis of the setting information. CONSTITUTION:When a start key K is pushed, a high frequency heating means 1 starts heating with the max. output, and a turn-table 4 and a fan F are rotated, and the timer of a controlling means 7 starts. When object to be heated 3 is heated and water vapor is generated, a humidity sensor 6 emits an output in accordance with the amount of water vapor, and when the value of output reaches a specified value, the controlling means 7 judges that the heating is completed, and the process is transferred to warm-keeping. The timer of this means 7 measures the time from start of heating till its completion, while a setting means 8 sets the heating output for warm-keeping in accordance with the measuring value given by the timer. The heating means 1 make warm- keeping heating for a certain period of time with an output according to the set value. Thereby proper heating is conducted according to the object to be heated, and wasteful use of electric power is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention provides a heating chamber for storing an object to be heated, a high-frequency heating means for heating the object to be heated by supplying high frequency waves to the heating chamber, The present invention relates to a high frequency heating device including a control means for operating the high frequency heating means so as to heat the object to be heated and then keep it warm.

[Prior Art] Heating by high-frequency heating means is performed by directly heating moisture contained in an object to be heated. Therefore, heat retention using the above-mentioned high-frequency heating device is performed by continuing to heat the heated object with a relatively weak heating output using high-frequency heating means in order to compensate for the amount of heat radiated from the heated object into the heating chamber. In the past, the heating output during heat retention was set to a standard constant value.

[Problem to be solved by the invention]

However, if the heating output during heat retention is constant, there are the following disadvantages, and there is room for improvement.In general, the larger the amount of the object to be heated, the larger its surface area, and the radiation per unit time. It has a large amount of heat. Therefore, in order to maintain the heated object at a constant temperature, a large amount of heating per unit time is required. However, when the heating output during heat retention is fixed based on the standard amount of the object to be heated, if the amount of the object to be heated is larger than the standard amount, the object to be heated will not be kept warm enough and will cool down.

On the other hand, if the amount of the object to be heated is less than the standard amount, it will be heated more than necessary during keeping warm, resulting in poor cooking conditions and wasteful power consumption.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to appropriately retain heat according to the amount of the heated object when heat retention is performed following heat treatment using high-frequency heating means. Our goal is to avoid wasting power.

[Means to solve the problem]

The high-frequency heating device according to the present invention includes a heating chamber that stores an object to be heated, a high-frequency heating means that heats the object to be heated by supplying high frequency waves to the heating chamber, and a high-frequency heating device that heat-processes the object to be heated, and then , a control means for operating the high-frequency heating means to perform heat retention, and a first characteristic configuration thereof is that an output setting means is provided for setting a heating output when performing the heat retention. The control means is configured to adjust the heating output of the high-frequency heating means during the heat retention based on the information of the output setting means.

The second to fourth characteristic configurations specify preferred specific configurations for implementing the first characteristic configuration, and details are as follows.

A second characteristic configuration is that a weight sensor that detects the weight of the object to be heated is provided, and the output setting means is configured to set the heating output to be larger as the weight becomes larger, based on the detection information of the weight sensor. It is in the point that it is.

A third characteristic configuration is that a sensor is provided to detect the completion of the heat treatment of the object to be heated, and the output setting means is configured to output a heating output as the time from the start of heating until the sensor detects the completion of heating increases. The reason is that it is configured to set a large value.

A fourth characteristic configuration is that a heat treatment time setting means for manually setting the heat treatment time is provided, and the output setting means sets the heating output during the heat retention to be larger as the setting time of the heating time setting means becomes longer. The point is that it is structured like this.

Further, a fifth characteristic configuration is that temperature detection means for detecting the surface temperature of the object to be heated is provided, and the control means is configured to control the temperature of the object to be heated during keeping warm based on information from the eight temperature detection means. The present invention is characterized in that the high frequency heating means is configured to operate in order to maintain the surface temperature at a target temperature.

A sixth characteristic configuration is that a temperature setting means for changing and setting the target temperature is added to the fifth characteristic configuration.

[For production]

According to the first characteristic configuration, the output setting means:
A heating output when performing heat retention is set, and the control means:
The heating output of the high-frequency heating means during heat retention is adjusted based on the information of the output setting means.

According to the second feature, the weight of the object to be heated is detected by the weight sensor, and the output setting means is set to increase the heating output as the weight increases, based on the detected pressure information.

According to the third feature, the output setting means is set to increase the heating output as the time from the start of heating until the sensor detects completion of heating is longer.

According to the fourth feature, the output setting means is set so that the longer the manual setting time by the heat treatment time setting means is, the larger the heating output during the heat retention is set.

According to the fifth characteristic configuration, the surface temperature of the object to be heated is detected by the temperature detection means, and the control means controls the operation of the high-frequency heating means so as to maintain the surface temperature at the target temperature.

According to the sixth characteristic configuration, the target temperature can be changed and set by the temperature setting means.

〔Effect of the invention〕

According to the first characteristic configuration, when heat retention is performed by the high-frequency heating means following heat treatment, the heating output during heat retention is adjusted based on the information of the output setting means.
Appropriate heat retention is performed according to the amount of the object to be heated. In other words,
The cooking condition will not deteriorate due to the heated object being cooled or heated more than necessary, and power will not be wasted. According to the second to fourth characteristic configurations, in any case, the output setting means is automatically set such that the heating output increases as the amount of the object to be heated increases.

According to the fifth characteristic configuration, the surface temperature of the object to be heated is detected by the temperature detection means, and the operation of the high-frequency heating means is controlled so as to maintain the surface temperature at the target temperature. Obtain the same effect as feature configuration. At this time, according to the sixth characteristic configuration, the target temperature can be arbitrarily set according to preference by the temperature setting means.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
In the high-frequency heating device of this embodiment shown in the figure, high-frequency waves are supplied into the heating chamber (2) by the high-frequency heating means 1).
An object to be heated (3) placed in a heating chamber (2) is subjected to heat treatment. (4) is a turntable for placing the object to be heated, and is driven and rotated by a motor (IJ) so that each part of the object to be heated is uniformly heated. (F) is a fan for cooling the high frequency heating means <1) and the like and for sending warmed air into the heating chamber from the air passage (IN).

On the other hand, a humidity sensor (6) as a sensor for detecting completion of heating is provided in the exhaust path (OUT) from the heating chamber (2). The humidity sensor (6) uses a thermistor element whose resistance value changes depending on the water vapor generated from the heated object (3) as it is heated. As a similar sensor, a gas sensor whose resistance value changes depending on not only water vapor but also gas generated from a heated object such as alcohol or carbon dioxide may be used.

(7) is a control means equipped with a microcontroller, which controls the heating output and heating time manually set, or the pre-programmed automatic heating procedure, and the information from the humidity sensor (6) mentioned above. According to the high frequency heating means (1
), fan (F), turntable motor (), etc. It also processes various manual input keys from the operation panel 9) and controls the display on the display (D). moreover,
It also controls a buzzer (B) that notifies the completion of heat treatment.

The operation panel (9) includes a keyboard (K) for selecting various heat treatments, setting heating conditions, etc., giving commands such as starting or canceling cooking, and a heat treatment time setting means for manually setting the heat treatment time. Potentiometer as (P
), and a display device (D) for displaying various information such as heating output and heating time.

This high-frequency heating device is equipped with a geographical mode (hereinafter referred to as "warming mode") in which the object to be heated is heated and then kept warm for up to 15 minutes. and,
The heating output during heating is constant at maximum output, but
The heating output during heat retention is determined by the output setting means (in the control means (7)).
Adjustments are made based on the information in 8). In this embodiment, the heating output is adjusted by controlling the high frequency heating means (1) intermittently and changing its on/off ratio. For example, turn on for 6 seconds and turn off for 34 seconds for high output when keeping warm, turn on for 4 seconds and turn off for 36 seconds for medium output, turn on for 2 seconds,
The heating output during heat retention is switched in three stages, with the 38-second off period as low output. The heating output during heat retention is automatically set by the output setting means (8), and the control method thereof will be described below.

This high-frequency heating device is equipped with two types of warming modes: automatic warming mode and manual warming mode. In the former case, the humidity sensor (6) automatically detects the completion of heating, sounds the buzzer (B), and then shifts to keeping warm.

The latter heats up for the time set by the potentiometer (P), then sounds the buzzer (B) and shifts to keeping warm. The heating output during heat retention is set by switching between the above-mentioned strong, medium, and weak outputs depending on the time from the start to the completion of heating. And for the following reasons,
The longer the heating time, the higher the heating output during keeping warm.

That is, it has been experimentally confirmed that if the heating time is automatically determined by the humidity sensor (6), the time is proportional to the amount of the object to be heated. Further, even when the heating time is manually set, the set time can be considered to be determined based on experience in proportion to the amount of the object to be heated. Heating by high-frequency heating means is performed by directly heating the moisture contained in the object to be heated, so in order to maintain a constant temperature of the object to be heated, the larger the amount, the greater the heating output is required. There is.

Therefore, for example, when the heating time is less than 1 minute, low output is selected, when the heating time is 1 minute or more but less than 2 minutes, medium output is selected, and when it is 2 minutes or more, high output is selected from among the heating outputs for keeping warm. be done.

Next, taking the automatic warming mode as an example, an outline of its operation and operation will be explained with reference to the flowchart of FIG. 2. In this high-frequency heating device, the display ([1) is a clock display except during cooking and cooking settings, and in this state, various cooking selection keys on the keyboard (K) can be accepted.

At this point, if you press the ``auto warm'' key and then press the start key, the heating starts after checking that the door is closed.

That is, the high frequency heating means (1) starts heating at maximum output, and the turntable (4) rotates. Others, fans (
F) etc. also start operating. Internal timer (T1) of microcomputer of control means (7) at the same time as heating start
starts.

As the object to be heated is heated, steam is generated from its surface. The output value of the humidity sensor (6) changes depending on the amount of water vapor, and when the amount of change reaches a certain condition value, the control means (7) determines that the heating has been completed. Then, the buzzer (B) will sound and the device will start keeping warm.

At this time, the timer (T1) indicates the time from the start to the completion of heating. If this time is less than 1 minute, the output is low, if the time is 1 minute or more and 2 minutes, the output is medium, and if it is 2 minutes or more, the output is medium. In this case, the strong output is set by the 8-power setting means (8) as the heating output during heat retention. Then, the timer (T2) that counts the maximum heat retention time of 15 minutes starts.
The high frequency heating means (1) starts thermal insulation heating with the heating output. The heat retention ends under any of the following conditions: when the door is opened, when the cancel key is pressed, or when the 15 minute timer (T2) ends.

In manual warming mode, after pressing the "manual warming" key and before starting, the heating time is set using the potentiometer (P), and the heating output during keeping warm is determined by the set time. Other than this point, the control is the same as in the automatic warming mode.

[Another example]

In the above embodiment, based on the fact that the larger the amount of the object to be heated, the longer the heating time, the output setting means (8 ) is automatically set, but the output setting method (
8) may be such that the heating output during heat retention can be directly manually set using a keyboard (K> or the like).

Alternatively, as shown in FIG. 3, a weight sensor (5) is provided below the turntable (4), and the object to be heated (3) placed on the turntable (4) is detected by the weight sensor (5).
), and the pressure setting means (8) may be configured to set the heating output during heat retention to be larger as the detected amount is larger. As the weight sensor (5), for example,
An element is used that converts the downward displacement of the turntable rotating shaft due to the weight of the object to be heated (3) into a change in voltage or a change in capacitance.

Further, as shown in Fig. 4, an infrared sensor (10) as a temperature detection means for detecting the surface temperature of the object to be heated is installed on the ceiling wall of the heating chamber (2), and the infrared sensor (10) detects the surface temperature of the object to be heated. The control means (7) may be configured to operate the high frequency heating means (1) in order to maintain the surface temperature of the heated object (3) at the target temperature. Furthermore, the potentiometer (P) can also be used as a temperature setting means (11) for changing and setting the target temperature, and the target temperature can be arbitrarily set according to preference.

Note that the potentiometer (P) for setting the target temperature and the heating time in the manual warming mode described above may be omitted, and the settings may be made using the keyboard (K).

Further, in the embodiment, a case where heat retention is performed after heating is explained, but the present invention is not limited to this.
Needless to say, it can be applied to heat retention after any heat treatment.

In addition, as a method of adjusting the heating output of the high frequency heating means (1), as described in the embodiment, turning on/off for a certain period of time is possible.
Although it is common practice to change the off-ratio, the present invention is not limited to this; for example, the heating output may be adjusted continuously using an inverter.

Incidentally, although reference numerals are included in the claims section for convenience of comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a high frequency heating device according to an embodiment of the present invention, FIG. 2 is a flow chart explaining its control operation, and FIGS. 3 and 4 are block diagrams showing another embodiment.

Claims (1)

[Claims] 1. A heating chamber (2) for storing an object to be heated (3), and high-frequency heating means for heating the object to be heated (3) by supplying high frequency waves to the heating chamber (2). (1); and a control means (7) for operating the high-frequency heating means (1) so as to heat-treat the object to be heated (3) and then keep it warm. , an output setting means (8) is provided for setting a heating output when performing the heat retention, and the control means (7) controls the high-frequency heating means during the heat retention based on the information of the output setting means (8). (1
) a high-frequency heating device configured to adjust the heating output of the device. 2. Weight sensor for detecting the weight of the object to be heated (3) (
5), and the output setting means (8) is configured to set the heating output larger as the weight increases, based on the detection information of the weight sensor (5).
The high frequency heating device described. 3. A sensor (6) is provided to detect the completion of the heat treatment of the object to be heated (3), and the output setting means (8) is configured to control the output from the start of heating until the sensor (6) detects the completion of heating. The high-frequency heating device according to claim 1, wherein the longer the time, the higher the heating output is set. 4. A heat treatment time setting means (P) for manually setting the heat treatment time is provided, and the output setting means (8) determines that the longer the setting time of the heat treatment time setting means (P), the longer the heating time during the heat retention. The high-frequency heating device according to claim 1, wherein the high-frequency heating device is configured to set a large output. 5. a heating chamber (2) for storing an object to be heated (3); a high-frequency heating means (1) for heating the object to be heated (3) by supplying high frequency waves to the heating chamber (2); A high-frequency heating apparatus is provided with a control means (7) for operating the high-frequency heating means (1) so as to heat-treat the object to be heated (3) and then keep it warm, the apparatus comprising:
Temperature detection means (10) for detecting the surface temperature of the temperature detection means (10) is provided, and the control means (7) controls the temperature detection means (10).
), the object to be heated (3
) A high-frequency heating device configured to operate the high-frequency heating means (1) to maintain the surface temperature of the substrate at a target temperature. 6. Temperature setting means (11) for changing and setting the target temperature
The high-frequency heating device according to claim 5, further comprising: a.