JP2003172515A - High frequency heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high frequency heating device which efficiently heats an article to be heated by operating the number and position of the article to be heated by a control means based on the information on the article detected by an infrared ray sensor, and by stopping the article to be heated in front of an opening with a strong field intensity of high frequency based on the operated data. <P>SOLUTION: The heating device comprises a heating chamber 2 for storing the article 1 to be heated and a table motor 7 for rotating a turntable 6 on which the article 1 is mounted. In addition, an opening 5 for guiding the high frequency wave generated from a magnetron 3 from a wave guide 4 to the heating chamber 2 is formed on a side surface of the heating chamber 2. The information on the article 1 mounted on the turntable 6 is detected by the infrared ray sensor 9, and based on the information, data on the number and position of the article 1 are prepared by a control means 10. The table motor 7 is operated based on the data, and the article 1 mounted on the turntable 6 is stopped in front of the opening 5 and heated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device for efficiently heating an object to be heated placed on a turntable based on temperature information detected by the temperature detecting means from the object to be heated.

[0002]

2. Description of the Related Art A conventional high-frequency heating device is disclosed in, for example, Japanese Patent Laid-Open No.
No. 001-165445, a heating chamber for accommodating an object to be heated, a turntable on which the object to be heated is placed, a motor for rotating the turntable, and a high-frequency wave generator for supplying high-frequency radio waves to the heating chamber. An apparatus, a temperature detecting means for detecting a temperature of the heated object by an infrared sensor for detecting radiation of infrared energy from the heated object, and a control means for controlling a rotation mechanism of the turntable, the temperature The rotation of the rotary table is controlled based on the temperature detected by the detection means to heat the object to be heated.

[0003]

In the above prior art, it was recognized that the temperature distribution of the object to be heated was detected by the infrared sensor during the high frequency heating, and there was a strong temperature part and a low temperature part. In this case, the rotation of the turntable is controlled so that the place where the temperature is low is stopped at the place where the electric field strength is high, which is installed in advance, so that the temperature difference of the object to be heated is reduced. Therefore, in the conventional technique, since the high frequency oscillated from the magnetron is radiated to the entire heating chamber, the method for correcting the low temperature portion due to the temperature difference due to the uneven heating in the object to be heated is the heating time. However, there was a problem that electricity cost could not be saved.

[0004]

In order to solve the above-mentioned problems, according to the present invention, a heating chamber for accommodating an object to be heated, a turntable on which the object to be heated is mounted, and a bottom table outside the heating chamber are provided. A table motor that rotates a turntable, a magnetron that oscillates a high frequency, a waveguide that fixes the magnetron and guides the high frequency oscillated from the magnetron to a heating chamber, an infrared sensor that detects the temperature of an object to be heated, In a high-frequency heating device equipped with control means for controlling the operation of a table motor or magnetron based on detection information from an infrared sensor or the like, an opening for radiating high frequency waves from a waveguide to the heating chamber is provided on the side wall surface of the heating chamber, and the infrared sensor is used. Detects the temperature information of the objects to be heated placed on the turntable, and based on this temperature information, the control means uses the data on the quantity and position of the objects to be heated. Create, this data operates a table motor based on, is an object to be heated that the placing on the turntable those to heat is stopped prior to the opening.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a heating chamber for accommodating an object to be heated, a turntable for mounting the object to be heated, a table motor provided outside the bottom of the heating chamber for rotating the turntable, A magnetron that oscillates a high frequency,
This magnetron is fixed, the waveguide that guides the high frequency oscillated from the magnetron to the heating chamber, the infrared sensor that detects the temperature of the object to be heated, and the operation information of the table motor and magnetron is controlled by the detection information of this infrared sensor. In a high-frequency heating device provided with a control means, an opening for radiating a high frequency from the waveguide to the heating chamber is provided on the side wall surface of the heating chamber,
The infrared sensor detects the temperature information of the object to be heated placed on the turntable, and based on this temperature information, the control means creates data on the quantity and position of the object to be heated. The object to be heated which is operated and placed on the turntable is stopped and heated before the opening.

Further, in order to quickly stop the object to be heated before the opening, the rotation direction of the table motor is changed.

Furthermore, a weight sensor for detecting the weight of the object to be heated is provided, and the heating time of the object to be heated is determined by the control means based on the weight information of the object to be heated by the weight sensor, and the objects to be heated are alternated. When the table motor stop mode for stopping before the opening is entered, the previously determined heating time is corrected to an appropriate heating time.

[0008]

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

FIG. 1 is a block diagram showing the structure of a high frequency heating apparatus according to an embodiment of the present invention, in which reference numeral 1 is an object to be heated. Reference numeral 2 is a heating chamber that houses the object to be heated 1. 3 is a magnetron which oscillates a high frequency. Reference numeral 4 denotes a waveguide, which is provided on the outer wall on the side surface of the heating chamber 2 and guides the high frequency wave oscillated from the magnetron 3 to the heating chamber 2. The magnetron 3 is fixed to this waveguide 4. Reference numeral 5 denotes an opening, which is connected to the waveguide 4 by a hole provided on the side wall surface of the heating chamber 2 and is where the high frequency is radiated to the heating chamber 2. Therefore, the electric field strength of the high frequency is the strongest in the vicinity of the opening 5.

Reference numeral 6 is a turntable on which the object to be heated 1 is placed. A table motor 7 is provided outside the bottom of the heating chamber 2. The table motor 7 has a rotary shaft 7a, which penetrates a hole 2a provided in the heating chamber 2, and a turntable 6 in the heating chamber 2 is fixed to the upper end of the hole 2a.

Reference numeral 8 denotes a weight sensor, which is interlocked with the rotary shaft 7a of the table motor 7 and detects the weight of the object 1 to be heated placed on the turntable 6. An infrared sensor 9 is provided outside the upper part of the heating chamber 2 and detects temperature information of the object 1 to be heated.

The temperature detection range P of the infrared sensor 9 covers almost the radius of the rotating turntable 6 as shown in FIG. FIG. 2 is a projection view on the turntable 6 showing the temperature detection range P of the infrared sensor 9 viewed from the upper part of the heating chamber 2.

Reference numeral 10 is a control means for controlling the operations of the table motor 7 and the magnetron 3 based on the information from the infrared sensor 9 and the weight sensor 8.

Next, the operation of this embodiment having the above configuration will be described.

As an example of the object to be heated 1, two objects 1a and 1b to be heated are simultaneously heated as shown in FIG. When the object 1 to be heated is placed on the turntable 6 and heating is started, the magnetron 3 operates to oscillate a high frequency and the table motor 7 also operates to rotate the turntable 6. The object 1 to be heated placed on the turntable 6 passes through the temperature detection range P of the infrared sensor 9 shown in FIGS. 1 and 2. When the object to be heated 1 becomes warm with the passage of time, the temperature information is detected by the infrared sensor 9 when passing through the temperature detection range P of the infrared sensor 9.

FIG. 4 shows this information. The point A in FIG. 4 is the infrared sensor 9 when the object to be heated 1a and the point B are the objects to be heated 1b passing through substantially the center of the temperature detection range P.
Is the temperature information of. In this way, when the turntable 6 has two peak values in the one-round time T, the control means 10 determines that the number of the objects to be heated 1 is two.

Next, the object to be heated 1b is based on the object to be heated 1a.
A method of detecting the positional relationship with the will be described. The infrared sensor 9 detects the time when the temperature detection range P has passed as a means for obtaining the positional relationship between the object to be heated 1a and the object to be heated 1b.
The positional relationship between the objects to be heated 1a, 1b is obtained by the control means 10. This positional relationship can be replaced with an angle or a time.

In the example of FIG. 2, the positional relationship between the objects to be heated 1a, 1b is T / 2 in time and 180 degrees in the angle. In the example of FIG. 3, the shortest distance between the objects to be heated 1a, 1b is: The time is T / 4, and the angle is 90 degrees.

As described above, the control means 10 causes the object to be heated 1 to be heated.
The positional relationship between a and 1b is calculated and stored, and the aperture 5 having the strongest electric field strength of the oscillated high frequency is emitted from the magnetron 3.
The table motor 7 is controlled so that the object to be heated 1a is stopped before. Then, heating is performed for a preset time, for example, 10 seconds, then the table motor 7 is rotated by the positional relationship previously obtained by the control means 10, and the object to be heated 1b is stopped in front of the opening 5 and heated for 10 seconds. In this way, the object to be heated 1
a and 1b are alternately stopped in front of the opening 5 to continue heating, and the heating is completed at the set time.

Next, a description will be given of an embodiment in which, for example, a stepping motor whose rotation direction can be arbitrarily changed to the table motor 7 in order to improve heating efficiency is used.

When the objects to be heated 1 are installed on the turntable 6 at intervals of 180 degrees as shown in FIG. 2, the objects to be heated 1a in front of the opening 5 become the objects to be heated 1b because they are equidistant. The time for changing the position is the same whether the turntable 6 is rotating in the S direction or the R direction.

However, as shown in FIG. 3, the objects to be heated 1a, 1b are heated.
Is placed at an angle of 180 degrees or less, for example, when placed about 90 degrees apart, the turntable 6 rotates in one direction during the time when the heated object 1a in front of the opening 5 is changed to the heated object 1b. The time for changing the position greatly changes depending on whether it rotates around the S direction and the R direction alternately.

In the case of FIG. 2, the time for changing the position of the object to be heated 1a in front of the opening 5 to the object to be heated 1b is 90 degrees apart in the S direction and in the R direction around the turntable 6 in one direction. Changing the position alternately will take about 1/4 of the time. Therefore, the position time of the object to be heated 1 is shortened, the high frequency can be effectively applied to the object to be heated 1, and the heating time is shortened.

In the above description, the number of objects to be heated 1 is two. However, even when the number of objects to be heated 1 is three, four, etc., the infrared sensor 9 detects the positional relationship between the objects to be heated 1. The heating time can be shortened by calculating the rotation direction of the turntable 6 which can be efficiently heated by the control means 10 based on this data.

Next, the heating time of the object 1 to be heated by the weight sensor 8 will be described with reference to the flowchart of FIG.
When the object 1 to be heated is placed on the turntable 6 and heating is started, the weight sensor 8 measures the weight of the object 1 to be heated. Based on this data, the control means 10 determines the heating time tw.

If the infrared sensor 9 detects a plurality of objects to be heated 1 and the control means 10 alternately stops the objects to be heated 1 in front of the opening 5, the table motor 7 stop mode is Y. It is reduced according to the weight of the object 1 and is set to tw1 as shown in FIG. Since this can efficiently heat the object to be heated 1, it is performed so as not to overheat, and the constant k changes depending on the object to be heated 1 and is determined in advance by experiments or the like, and its value is 0. 7
Is set to ˜0.9.

Next, when heating progresses and the heating time is subtracted and becomes zero, the heating ends.

When the stop mode of the table motor 7 in the flowchart of FIG. 5 is N, the object 1 to be heated is placed in the center of the turntable 6, and heating is performed in the normal mode at this time.

In this way, the infrared sensor 9 is used to heat the object 1 to be heated.
Information is detected, the control means 10 calculates the quantity and positional relationship, and based on this data, the heating time is shortened by stopping in front of the opening 5 with the highest high frequency electric field strength and heating efficiently. Electricity costs can be saved.

[0030]

As described above, according to the present invention, the heating chamber for containing the object to be heated, the turntable for mounting the object to be heated, and the table provided outside the bottom of the heating chamber for rotating the turntable are provided. A motor, a magnetron that oscillates a high frequency, a waveguide that fixes the magnetron and guides the high frequency oscillated from the magnetron to the heating chamber, an infrared sensor that detects the temperature of the object to be heated, and the detection information of this infrared sensor, etc. In a high-frequency heating device equipped with control means for controlling the operation of a table motor or magnetron by means of, an opening for radiating high-frequency waves from a waveguide to the heating chamber is provided on the side wall surface of the heating chamber, and placed on a turntable by an infrared sensor. The temperature information of the heated object is detected, and the number and position of the heated object are created by the control means based on this temperature information. Operates a table motor based on,
The object to be heated placed on the turntable is stopped and heated before the opening.

Further, in order to quickly stop the object to be heated before opening, the rotation direction of the table motor is changed.

Further, a weight sensor for detecting the weight of the object to be heated is provided, and the heating time of the object to be heated is determined by the control means on the basis of the weight information of the object to be heated by the weight sensor, and the objects to be heated are alternated. When the table motor stop mode for stopping before the opening is entered, the previously determined heating time is corrected to an appropriate heating time.

Since this makes it possible to stop before the opening where the electric field strength of the high frequency is the strongest, efficient heating can shorten the heating time and save the electricity bill.

Further, there is an effect that the heating time is corrected by the detection information of the weight sensor, and an appropriate finish can be achieved without overheating.

[Brief description of drawings]

FIG. 1 is a block diagram of a high frequency heating apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram in which two objects to be heated are placed at equal intervals on a turntable according to an embodiment of the present invention.

FIG. 3 is a view in which two objects to be heated are placed at unequal intervals on the turntable according to the embodiment of the present invention.

FIG. 4 is a relationship diagram of temperature and time of an object to be heated detected by an infrared sensor according to an embodiment of the present invention.

FIG. 5 is a flowchart of heating time according to an embodiment of the present invention.

[Explanation of symbols]

1 Object to be heated 2 heating chambers 3 magnetron 4 Waveguide 5 openings 6 turntable 7 table motor 8 weight sensor 9 Infrared sensor 10 Control means

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05B 6/78 H05B 6/78 AF term (reference) 3K086 AA01 AA08 BA08 BB08 CA01 CA04 CB03 CB06 CC06 CD11 CD24 3K090 LA00 MA01 3L086 AA04 BB05 CB04 CB15 CB16 CC12 DA06 DA12

Claims (3)

[Claims] 1. A heating chamber (2) for accommodating an object (1) to be heated.
And a turntable (6) on which the object to be heated (1) is placed
A table motor (7) provided outside the bottom of the heating chamber (2) for rotating the turntable (6), a magnetron (3) for oscillating a high frequency, and a magnetron (3) fixed to the magnetron (3). Waveguide (4) that guides the high frequency oscillated from 3) to the heating chamber (2), infrared sensor (9) that detects the temperature of the object (1) to be heated, and detection information of this infrared sensor (9), etc. In the high-frequency heating device provided with the control means (10) for controlling the operation of the table motor (7) and the magnetron (3) by means of the opening (5) for radiating a high frequency from the waveguide (4) to the heating chamber (2).
Is provided on the side wall of the heating chamber (2), and the object to be heated (1) placed on the turntable (6) by the infrared sensor (9).
Of the temperature information of the control means (1
0) data of the quantity and position of the object to be heated (1) is created, the table motor (7) is operated based on this data, and the object to be heated (1) placed on the turntable (6) is described above. A high-frequency heating device, characterized in that it is stopped and heated before the opening (5). 2. The high-frequency heating device according to claim 1, wherein the rotation direction of the table motor (7) is changed in order to quickly stop the object to be heated (1) before the opening (5). 3. A weight sensor (8) for detecting the weight of the object to be heated (1) is provided, and the control means (10) controls the weight based on the weight information of the object to be heated (1) by the weight sensor (8). When the heating time (tw) of the heating object (1) is determined and the table motor stop mode for alternately stopping the heating object (1) in front of the opening (5) is entered, the previously determined heating time (tw 2. The high-frequency heating device according to claim 1, wherein tw) is corrected to an appropriate heating time (tw1).