JPH06109252A - Decompression high frequency heating device - Google Patents
Decompression high frequency heating deviceInfo
- Publication number
- JPH06109252A JPH06109252A JP25450092A JP25450092A JPH06109252A JP H06109252 A JPH06109252 A JP H06109252A JP 25450092 A JP25450092 A JP 25450092A JP 25450092 A JP25450092 A JP 25450092A JP H06109252 A JPH06109252 A JP H06109252A
- Authority
- JP
- Japan
- Prior art keywords
- heated
- pressure
- closed container
- size
- detecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 36
- 230000006837 decompression Effects 0.000 title claims abstract description 12
- 230000008859 change Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Control Of High-Frequency Heating Circuits (AREA)
- Constitution Of High-Frequency Heating (AREA)
- Electric Ovens (AREA)
Abstract
(57)【要約】
【目的】 密閉容器内の圧力検出に必要な圧力センサ
を、本来の真空ポンプの制御に必要な手段のみとしてで
はなく、被加熱物の大きさを測定する被加熱物検出手段
としても併用することにより、被加熱物の検出手段とし
て特別な装置を付加せずに、被加熱物の検出を行う。
【構成】 密閉容器内の減圧が開始されると、圧力セン
サにより密閉容器内の圧力変化を計測することにより被
加熱物の大きさを検知し、その大きさに応じて計算され
た加熱時間だけ被加熱物へのマイクロ波加熱を実行す
る。また、所定圧力到達後、圧力センサからの信号によ
り密閉容器内が所定の真空度にほぼ一定に維持されるよ
う真空ポンプならびに真空排気弁を制御する。
(57) [Abstract] [Purpose] The pressure sensor necessary for detecting the pressure inside the closed container is not only used as the means necessary for the control of the original vacuum pump, but also for detecting the size of the heated object. By also being used as the means, the heated object can be detected without adding a special device as the heated object detecting means. [Configuration] When decompression in the closed container is started, the size of the object to be heated is detected by measuring the pressure change in the closed container with the pressure sensor, and only the heating time calculated according to the size is detected. Perform microwave heating on the object to be heated. Further, after the predetermined pressure is reached, the vacuum pump and the vacuum exhaust valve are controlled so that the inside of the hermetically sealed container is maintained at a predetermined degree of vacuum substantially constant by a signal from the pressure sensor.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、減圧下でマイクロ波加
熱を行うようにした減圧高周波加熱装置に関し、特にそ
の加熱の自動化に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reduced-pressure high-frequency heating device for performing microwave heating under reduced pressure, and more particularly to automation of the heating.
【０００２】[0002]
【従来の技術】従来、大気圧下でのマイクロ波における
加熱の自動化において、被加熱物を検知するための手段
として、重さを検知する重量センサ、被加熱物から発せ
られる水分・ガスなどを検出する湿度・ガスセンサ、被
加熱物の表面温度を検出する赤外線センサなどを使用し
ていた。そして、前記センサ等から検出された被加熱物
に関する情報を利用して、加熱時間およびマイクロ波の
出力等被加熱物への加熱の最適方法をマイクロコンピュ
ータ等で演算し、制御していた。2. Description of the Related Art Conventionally, in automation of heating in a microwave under atmospheric pressure, as a means for detecting an object to be heated, a weight sensor for detecting the weight, moisture and gas emitted from the object to be heated, etc. A humidity / gas sensor for detection and an infrared sensor for detecting the surface temperature of the object to be heated were used. Then, using the information on the object to be heated detected by the sensor or the like, an optimum method of heating the object to be heated such as heating time and microwave output is calculated and controlled by a microcomputer or the like.
【０００３】[0003]
【発明が解決しようとする課題】ところで、減圧下でマ
イクロ波加熱を行うようにした高周波加熱装置における
圧力検出手段は、密閉容器内の圧力を検出し密閉容器内
を所定の圧力にほぼ一定させることのみに使用され、他
の利用法として特に使用されていなかった。また、被加
熱物の大きさを検出する手段として重量センサのような
重量検出装置は、減圧下での加熱を行う場合、密閉容器
と連結して重量センサを設置することは密閉容器の密閉
度を維持する上で構造上困難であり、また経済面でも不
合理であった。By the way, the pressure detecting means in the high-frequency heating device which performs microwave heating under reduced pressure detects the pressure in the closed container and makes the inside of the closed container substantially constant. It was only used for things and was not specifically used for other uses. Further, as a weight detection device such as a weight sensor as a means for detecting the size of the object to be heated, when performing heating under a reduced pressure, it is necessary to install the weight sensor in connection with the closed container. It was structurally difficult to maintain, and economically unreasonable.
【０００４】本発明は、上述した問題点を解決するため
になされたものであり、被加熱物の大きさを検出するた
めの新たな専用の検出手段を追加設置することなく、被
加熱物の大きさを検知できるようにしたものである。The present invention has been made in order to solve the above-mentioned problems, and the object to be heated can be installed without additionally installing a new exclusive detecting means for detecting the size of the object to be heated. The size can be detected.
【０００５】[0005]
【課題を解決するための手段】この目的を達成するため
に本発明の減圧高周波加熱装置は、密閉容器内の所定圧
力を検出する圧力検出手段が、減圧過程における密閉容
器内の圧力変化から被加熱物の大きさを検知する被加熱
物検出手段としての機能を兼ね備えている。In order to achieve this object, in the decompression high frequency heating apparatus of the present invention, the pressure detecting means for detecting a predetermined pressure in the closed container is protected from the pressure change in the closed container during the depressurization process. It also has a function as a heated object detection means for detecting the size of the heated object.
【０００６】[0006]
【作用】上記の構成を有する本発明の減圧高周波加熱装
置は、圧力検出手段を用いながら減圧装置を制御して密
閉容器内を所定の圧力に減圧すると共に、減圧過程にお
いて被加熱物検出手段として機能する圧力検出手段によ
り密閉容器内の被加熱物の大きさを検知し、所定の圧力
に減圧後マイクロ波発生装置への給電を被加熱物の大き
さに応じて制御し、被加熱物を自動的に加熱する。In the decompression high-frequency heating apparatus of the present invention having the above-mentioned structure, the decompression device is controlled while using the pressure detection means to decompress the inside of the closed container to a predetermined pressure, and as a heating object detection means in the decompression process. The function of the pressure detection means detects the size of the object to be heated in the closed container, and after reducing the pressure to a predetermined pressure, the power supply to the microwave generator is controlled according to the size of the object to be heated. Heat automatically.
【０００７】[0007]
【実施例】以下、本発明を具体化した一実施例を図面を
参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【０００８】図１は本発明の一実施例を示す減圧高周波
加熱装置の概略構成図である。FIG. 1 is a schematic configuration diagram of a reduced pressure high frequency heating apparatus showing an embodiment of the present invention.
【０００９】先ず、図１において、密閉容器１の前面開
口部にはドア２が開閉自在に軸支されている。密閉容器
１の内部には被加熱物３が収容され、密閉容器１の内部
はドア２の周縁に配したパッキン４を介して密封され
る。マイクロ波発生装置たるマグネトロン５は、導波管
６により密閉容器１に結合されており、開口部は結晶化
ガラスなど電波の透過性が高く硬度の高い板状の仕切板
７がパッキンなどにより封止されている。密閉容器１内
の空気は、密閉容器１の一壁面に設けられた排気口８か
ら真空排気弁９を通して減圧手段たる真空ポンプ１０に
より排出される。圧力検出手段たる圧力センサ１１は、
密閉容器１の一壁面に配置され、被加熱物検出手段とし
ても併用される。マイクロコンピュータ等からなる制御
部（制御手段）１２は圧力センサ１１の信号を検知回路
１３を介して監視する。そして、マグネトロン５や真空
ポンプ１０、真空排気弁９、真空解放弁１４などへの給
電や作動をそれぞれドライバ１５、１６、１７、１８を
介して制御する。また、減圧および加熱終了後に密閉容
器１内を大気圧に戻すには、真空解放弁１４を通して外
気を密閉容器１内に取り入れることにより行われる。First, in FIG. 1, a door 2 is rotatably supported by an opening in a front surface of a closed container 1 so as to be openable and closable. The object 3 to be heated is housed inside the closed container 1, and the inside of the closed container 1 is sealed via a packing 4 arranged on the periphery of the door 2. The magnetron 5, which is a microwave generator, is connected to the closed container 1 by a waveguide 6, and the opening has a plate-shaped partition plate 7 such as crystallized glass having high radio wave permeability and high hardness, which is sealed with packing or the like. It has been stopped. The air in the closed container 1 is exhausted from an exhaust port 8 provided on one wall surface of the closed container 1 through a vacuum exhaust valve 9 by a vacuum pump 10 as a pressure reducing means. The pressure sensor 11, which is a pressure detecting means,
It is arranged on one wall surface of the closed container 1 and is also used as a heated object detecting means. A control unit (control means) 12 including a microcomputer or the like monitors a signal from the pressure sensor 11 via a detection circuit 13. Then, power supply and operation to the magnetron 5, the vacuum pump 10, the vacuum exhaust valve 9, the vacuum release valve 14, etc. are controlled via the drivers 15, 16, 17, and 18, respectively. Further, in order to return the inside of the closed container 1 to the atmospheric pressure after the decompression and the heating, the outside air is introduced into the closed container 1 through the vacuum release valve 14.
【００１０】次に作用について、図２の減圧中における
密閉容器１内の圧力変化、図３の減圧および加熱中の密
閉容器１内の圧力推移および減圧高周波加熱装置のタイ
ムチャートを用いて説明する。Next, the operation will be described with reference to the time chart of the pressure change in the closed container 1 during depressurization in FIG. 2, the pressure change in the closed container 1 during depressurization and heating in FIG. .
【００１１】先ず図３において、密閉容器１内に被加熱
物３を納置し、前記密閉容器１のドア２を閉じる。そし
て図示を省略した装置前面の操作パネル上で真空度Ｐを
設定してスタートスイッチ（図示せず）を押下する。こ
れに応答して制御部１２は、密閉容器１の連通部に設け
た真空排気弁９を解放し、真空解放弁１４を閉じた状態
にて真空ポンプ１０を作動させることにより、密閉容器
１内の減圧を開始する。減圧開始と同時に制御部１２に
内蔵されたタイマ１９を作動させる。前記タイマ１９
は、密閉容器１内の圧力が所定の圧力Ｐ1 に減圧される
までの時間Ｔ1 を測定し、所定の圧力Ｐ1 に達した時タ
イマ１９の作動を中止する。First, in FIG. 3, the object 3 to be heated is placed in the closed container 1, and the door 2 of the closed container 1 is closed. Then, the degree of vacuum P is set on the operation panel (not shown) on the front of the apparatus, and the start switch (not shown) is pressed. In response to this, the control unit 12 releases the vacuum exhaust valve 9 provided in the communicating portion of the closed container 1 and operates the vacuum pump 10 with the vacuum release valve 14 closed, whereby the inside of the closed container 1 is closed. Start depressurizing. Simultaneously with the start of depressurization, the timer 19 incorporated in the control unit 12 is activated. The timer 19
The pressure in the sealed container 1 by measuring the time T 1 of the up is reduced to a predetermined pressure P 1, it stops the operation of the timer 19 when it reaches a predetermined pressure P 1.
【００１２】ここで、図２において、減圧途中における
密閉容器１内から真空ポンプ１０によって外部へ排出さ
れる空気量と密閉容器１内に納置された被加熱物３の大
きさ（体積）は、反比例の関係にある。この関係により
真空ポンプ１０の一定した排気力により密閉容器１内の
空気を排出したとき、密閉容器１内の圧力は、被加熱物
３の大きさ（体積）が大きい程速く減圧され、所定の圧
力Ｐ１に到達する。このことを利用して、制御部１２
は、予め実験等により求められた時間Ｔ1 と被加熱物３
の大きさとの関係を表す計算式を用いて被加熱物３の大
きさを割り出し、或いは、予めメモリに格納されている
被加熱物３の大きさと時間Ｔ1 との対照表を参照して、
時間Ｔ1 に応じた被加熱物３の大きさを求める。Here, in FIG. 2, the amount of air discharged from the inside of the closed container 1 to the outside by the vacuum pump 10 during the depressurization and the size (volume) of the object to be heated 3 stored in the closed container 1 are as follows. , Inversely related. Due to this relationship, when the air in the closed container 1 is discharged by the constant exhaust force of the vacuum pump 10, the pressure in the closed container 1 is reduced faster as the size (volume) of the object to be heated 3 increases, and the predetermined pressure is reduced. The pressure P1 is reached. Utilizing this fact, the control unit 12
Is the time T 1 and the object to be heated 3 which are obtained in advance by experiments or the like.
The size of the object to be heated 3 is calculated using a formula expressing the relationship with the size of the object to be heated, or a reference table of the size of the object to be heated 3 and the time T 1 stored in the memory in advance is referred to,
The size of the object 3 to be heated is calculated according to the time T 1 .
【００１３】密閉容器１内の圧力がＰ1 よりさらに減圧
され、所定の真空度Ｐに達した後、真空排気弁９を閉
じ、真空ポンプ１０を停止し、一連の減圧過程は終了と
なる。次に、前述の減圧途中に判定した被加熱物３の大
きさにより、制御部１２にて被加熱物３の加熱時間Ｔを
算出する。そして、その加熱時間Ｔを制御部１２に設定
し、加熱時間Ｔのカウントダウンを開始する。また、マ
グネトロン５への給電を開始し、密閉容器１内の被加熱
物３にマイクロ波を照射し、加熱を開始する。加熱中、
被加熱物３から発生する水蒸気等により密閉容器１内の
圧力が次第に上昇するが、圧力センサ１１および検知回
路１３からの信号に基づき、密閉容器１内の圧力が所定
の真空度Ｐに維持されるよう、制御部１２はドライバ１
７、１６を通して加熱が終了されるまで真空排気弁９お
よび真空ポンプ１０を制御する。After the pressure in the closed container 1 is further reduced from P 1 and reaches a predetermined vacuum degree P, the vacuum exhaust valve 9 is closed, the vacuum pump 10 is stopped, and a series of depressurization processes are completed. Next, the control unit 12 calculates the heating time T of the object to be heated 3 based on the size of the object to be heated 3 determined during the depressurization. Then, the heating time T is set in the control unit 12, and the countdown of the heating time T is started. Further, the power supply to the magnetron 5 is started, the object 3 to be heated in the closed container 1 is irradiated with microwaves, and heating is started. During heating
Although the pressure in the closed container 1 gradually rises due to water vapor generated from the object to be heated 3, the pressure in the closed container 1 is maintained at a predetermined vacuum degree P based on the signals from the pressure sensor 11 and the detection circuit 13. So that the controller 12 controls the driver 1
The vacuum exhaust valve 9 and the vacuum pump 10 are controlled until the heating is completed through 7 and 16.
【００１４】そして、加熱時間が設定された時間に達す
ると、マイクロ波による加熱工程が終了され、真空解放
弁１４を解放し、密閉容器１内を大気圧に戻し、ドア２
を開いて被加熱物３を取り出す。When the heating time reaches the set time, the microwave heating process is completed, the vacuum release valve 14 is released, the inside of the closed container 1 is returned to the atmospheric pressure, and the door 2 is opened.
To open the object 3 to be heated.
【００１５】なお、上記実施例においては、減圧開始か
ら所定の圧力に減圧されるまでの時間を計測し、密閉容
器１内の圧力変化を検知して被加熱物３の大きさを検知
したが、例えば、真空ポンプ１０による減圧が開始され
た時からある一定時間後の圧力を圧力センサ１１により
測定したり、また、減圧を開始した時から圧力センサ１
１により検出した密閉容器１内の圧力の時間的変化量
（ΔＰ／Δｔ）を測定して、密閉容器１内の圧力変化を
検知し、被加熱物３の大きさを検知して加熱時間Ｔを求
めるようにしてもよい。In the above embodiment, the time from the start of depressurization to the depressurization to a predetermined pressure was measured, and the change in pressure in the closed container 1 was detected to detect the size of the object 3 to be heated. For example, the pressure sensor 11 measures the pressure after a certain period of time from the time when the pressure reduction by the vacuum pump 10 is started, or the pressure sensor 1 when the pressure reduction is started.
1, the time change amount (ΔP / Δt) of the pressure inside the closed container 1 is measured, the pressure change inside the closed container 1 is detected, the size of the object 3 to be heated is detected, and the heating time T May be requested.
【００１６】また、上記実施例においては、圧力変化を
計測することにより被加熱物３の大きさを検知して加熱
時間Ｔを算出したが、例えば、被加熱物３の大きさによ
りマイクロ波出力を最適出力となるように設定して加熱
制御を行うようにしてもよい。In the above embodiment, the heating time T is calculated by detecting the size of the object 3 to be heated by measuring the pressure change. However, for example, the microwave output depending on the size of the object 3 to be heated. May be set to an optimum output to perform heating control.
【００１７】[0017]
【発明の効果】以上説明したことから明かなように、本
発明の減圧高周波加熱装置によれば、密閉容器内の圧力
検出に必要な圧力検出手段を、密閉容器内の圧力変化か
ら被加熱物の大きさを検知するための被加熱物検出手段
として併用しているため、被加熱物の大きさを検知する
ための新たな専用の検出手段を追加設置することなく、
減圧下における加熱の自動化を実現できる。As is clear from the above description, according to the decompression high-frequency heating apparatus of the present invention, the pressure detecting means necessary for detecting the pressure in the closed container is provided with the object to be heated based on the pressure change in the closed container. Since it is also used as a heated object detection means for detecting the size of the, without installing a new dedicated detection means for detecting the size of the heated object,
Automation of heating under reduced pressure can be realized.
【図１】本発明の一実施例を示す減圧高周波加熱装置の
概略図である。FIG. 1 is a schematic view of a reduced-pressure high-frequency heating device showing an embodiment of the present invention.
【図２】減圧中における密閉容器内の圧力変化を示す図
である。FIG. 2 is a diagram showing a pressure change in a closed container during depressurization.
【図３】減圧および加熱中の密閉容器内の圧力推移およ
び減圧高周波加熱装置のタイムチャート図である。FIG. 3 is a time chart diagram of a pressure transition in a closed container during depressurization and heating and a depressurization high-frequency heating device.
１ 密閉容器 ３ 被加熱物 ５ マグネトロン（マイクロ波発生装置） １０ 真空ポンプ（減圧手段） １１ 圧力センサ（圧力検出手段、被加熱物検出手段） １２ 制御部（制御手段） DESCRIPTION OF SYMBOLS 1 Airtight container 3 Object to be heated 5 Magnetron (microwave generator) 10 Vacuum pump (pressure reducing means) 11 Pressure sensor (pressure detecting means, object to be heated detecting means) 12 Control unit (controlling means)
Claims (2)
容器内の被加熱物にマイクロ波を照射するマイクロ波発
生装置と、密閉容器内を減圧する減圧手段と、所定の圧
力を検出する圧力検出手段とを備え、更には減圧手段に
より密閉容器内を所定の圧力に減圧する過程で、圧力検
出手段を被加熱物の大きさを検知する被加熱物検出手段
として併用し、その被加熱物検出手段により検知された
大きさに基づいてマイクロ波発生装置への給電を制御す
る制御手段を備えたことを特徴とする減圧高周波加熱装
置。1. A closed container capable of storing an object to be heated, a microwave generator for irradiating the object to be heated in the closed container with microwaves, a decompression means for decompressing the inside of the closed container, and a predetermined pressure. With a pressure detecting means for detecting, further in the process of depressurizing the closed container to a predetermined pressure by the depressurizing means, the pressure detecting means is also used as the heated object detecting means for detecting the size of the heated object, A decompression high-frequency heating apparatus comprising: a control unit that controls power supply to a microwave generator based on a size detected by a heated object detection unit.
した時から、密閉容器内が所定の圧力に達するまでの時
間を計測し、その圧力変化から被加熱物の大きさを検知
することを特徴とする請求項１に記載の減圧高周波加熱
装置。2. The control means measures the time from the start of decompression by the decompression means until the inside of the closed container reaches a predetermined pressure, and detects the size of the object to be heated from the pressure change. The reduced pressure high frequency heating apparatus according to claim 1, which is characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25450092A JPH06109252A (en) | 1992-09-24 | 1992-09-24 | Decompression high frequency heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25450092A JPH06109252A (en) | 1992-09-24 | 1992-09-24 | Decompression high frequency heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06109252A true JPH06109252A (en) | 1994-04-19 |
Family
ID=17265922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25450092A Pending JPH06109252A (en) | 1992-09-24 | 1992-09-24 | Decompression high frequency heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06109252A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014194325A (en) * | 2013-03-29 | 2014-10-09 | Mitsubishi Electric Corp | Heating cooker |
| EP4015915A1 (en) * | 2020-12-21 | 2022-06-22 | Koninklijke Fabriek Inventum B.V. | Device comprising a content volume measurement, oven configured for measuring a content volume, and computer readable medium |
-
1992
- 1992-09-24 JP JP25450092A patent/JPH06109252A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014194325A (en) * | 2013-03-29 | 2014-10-09 | Mitsubishi Electric Corp | Heating cooker |
| EP4015915A1 (en) * | 2020-12-21 | 2022-06-22 | Koninklijke Fabriek Inventum B.V. | Device comprising a content volume measurement, oven configured for measuring a content volume, and computer readable medium |
| US11732898B2 (en) | 2020-12-21 | 2023-08-22 | B/E Aerospace, Inc. | Content volume measurement |
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