JPS6332235B2 - - Google Patents
Info
- Publication number
- JPS6332235B2 JPS6332235B2 JP57038441A JP3844182A JPS6332235B2 JP S6332235 B2 JPS6332235 B2 JP S6332235B2 JP 57038441 A JP57038441 A JP 57038441A JP 3844182 A JP3844182 A JP 3844182A JP S6332235 B2 JPS6332235 B2 JP S6332235B2
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- heating chamber
- rotating
- heating
- frequency
- 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.)
- Expired
Links
- 238000010438 heat treatment Methods 0.000 claims description 48
- 230000005684 electric field Effects 0.000 description 14
- 238000000034 method Methods 0.000 description 7
- 230000005855 radiation Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/72—Radiators or antennas
- H05B6/725—Rotatable antennas
Description
【発明の詳細な説明】
本発明は高周波電磁波を使用し空洞共振器中で
誘電加熱を行う高周波加熱装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high-frequency heating device that performs dielectric heating in a cavity resonator using high-frequency electromagnetic waves.
従来高周波電磁波の空洞共振器中すなわち加熱
室内の被加熱物を均一に加熱する方法として、高
周波電磁波を撹拌するスタラー方式や、被加熱物
を回転台にのせて回転させるターンテーブル方式
や、高周波電磁波の放射体すなわち回転アンテナ
を回転させる回転アンテナ方式がある。これらの
中で回転アンテナ方式が最も加熱室中に占める部
分が少さいので有効加熱室寸法が大きい為に特に
家庭用電子レンジのコンパクトタイプによく用い
られている。しかし回転アンテナ方式は他の方式
に比べて寸法や形状が大変重量である回転アンテ
ナに関する従来からの特許は多くある。しかし加
熱室の寸法が変化したり、回転アンテナの回転軸
の位置が変わると回転アンテナの形状、寸法が大
きく変化する為形状のみでなく寸法も大変重要な
要因となる。同一形状でも寸法が高周波電磁波の
発振波長の４分の１変化すると、加熱室内の加熱
分布はもちろん、高周波発振器の出力も特性が完
全に逆転するほど変化してしまう欠点があつた。 Conventional methods for uniformly heating the heated object in a cavity resonator of high-frequency electromagnetic waves, that is, inside the heating chamber, include the stirrer method, which stirs the high-frequency electromagnetic waves, the turntable method, in which the heated object is placed on a rotary table and rotated, and the high-frequency electromagnetic wave method. There is a rotating antenna method that rotates a radiator, that is, a rotating antenna. Among these, the rotating antenna method occupies the least space in the heating chamber, so the effective heating chamber size is large, so it is often used especially in compact home microwave ovens. However, the rotary antenna method is much heavier in size and shape than other methods, and there are many patents related to the rotary antenna. However, if the dimensions of the heating chamber change or the position of the rotation axis of the rotary antenna changes, the shape and dimensions of the rotary antenna will change significantly, so not only the shape but also the dimensions are very important factors. Even with the same shape, if the dimensions change by a quarter of the oscillation wavelength of the high-frequency electromagnetic waves, the heating distribution in the heating chamber as well as the output of the high-frequency oscillator have the disadvantage that the characteristics change to the extent that they are completely reversed.
本発明は回転アンテナ方式において回転軸に相
当するアンテナから電波放射せず又回転するアン
テナの先端迄加熱室内に電波を放射しないで伝搬
させ、アンテナの先端からのみ垂直な電界を放射
することにより、加熱室内の電界分布を均一にす
ることを目的とする。 In the rotating antenna system, the present invention does not radiate radio waves from the antenna corresponding to the rotation axis, and propagates the radio waves to the tip of the rotating antenna without radiating them into the heating chamber, and radiates a vertical electric field only from the tip of the antenna. The purpose is to make the electric field distribution within the heating chamber uniform.
以下本発明の一実施例について図面に基づき説
明する。 An embodiment of the present invention will be described below based on the drawings.
第１図において、家庭用ヒータプレート付電子
レンジを示し、本体１の上部には２口のヒータプ
レート２が設けられており、煮物などができる。
本体１の２つの制御つまみＡ３でそれぞれヒータ
プレート２の電力を制御調節する。また加熱室４
内のヒータ加熱や高周波加熱については制御つま
みＢ５により調節する。加熱室４の前面開口部に
は食品を出し入れするためのドア６を設けてい
る。 In FIG. 1, a household microwave oven with a heater plate is shown. Two heater plates 2 are provided on the upper part of the main body 1, and can be used for boiling food.
Two control knobs A3 on the main body 1 control and adjust the power of the heater plate 2, respectively. Also heating chamber 4
Heater heating and high-frequency heating inside are adjusted using a control knob B5. A front opening of the heating chamber 4 is provided with a door 6 for taking food in and out.
第２図において、本体１の上部は耐熱性の誘電
体からなるヒータプレート２が設けられプレート
ヒータ７により加熱調理が可能である。加熱室４
の上面部および底面部にはオーブンヒータ８，９
が配設され、室内でのオーブン加熱あるいは焦目
付加熱が可能である。加熱室４の壁面１０の外部
周囲には、室外への放熱を防止するための耐熱性
の断熱材１１が設けられている。 In FIG. 2, a heater plate 2 made of a heat-resistant dielectric material is provided on the upper part of the main body 1, and cooking can be performed using a plate heater 7. Heating chamber 4
Oven heaters 8 and 9 are installed on the top and bottom of the
is installed, allowing indoor oven heating or additional heating for browning. A heat-resistant heat insulating material 11 is provided around the outside of the wall surface 10 of the heating chamber 4 to prevent heat radiation to the outside.
一方高周波発振器でマグネトロン１２からの高
周波電磁波はテーパ状導波管１３を通りモータ１
４の回転力がベルト１５により伝達され回転する
回転アンテナ１６により加熱室４内に給電され
る。 On the other hand, high-frequency electromagnetic waves from the magnetron 12 are transmitted through a tapered waveguide 13 to the motor 1.
The rotational force of the heating chamber 4 is transmitted by the belt 15 and is fed into the heating chamber 4 by the rotating rotary antenna 16 .
第３図において加熱室４内に回転する回転アン
テナ１６より高周波電磁波を放射するものである
が、加熱室４の寸法によつては回転軸に相当する
回転アンテナ１６の加熱室４側の寸法l1はあまり
長いとこの回転アンテナ１６より電磁波が放射し
てしまい、回転アンテナ１６の先端迄電磁波が伝
搬しない。又回転アンテナ１６に直角なアンテナ
Ａ１７及びアンテナＢ１８も伝搬インピーダンス
が高いと加熱室１４内に放射してしまい、アンテ
ナＡ１７の先端迄電波が伝搬しない。そこで伝搬
インピーダンスを下げる為にアンテナＡ１７、ア
ンテナＢ１８の巾寸法を、加熱室４壁とアンテナ
Ａ１７とアンテナＢ１８との距離すなわちl1の寸
法より大きくすることにより、電波の伝搬インピ
ーダンスが低くなり、加熱室４内には放射しなく
している。しかし少しの電波は加熱室４内に放射
する。これはアンテナＡ１７とアンテナＢ１８の
電界E1１９，E2２０はそれぞれ逆を向いている
ので互いに打ち消し合い相殺されるので実質的に
は加熱室４内へ伝搬しない。なお加熱室４壁とア
ンテナＡ１７とアンテナＢ１８との距離すなわち
l1は短かければ短かい程回転軸に電波がのらず、
回転軸の鉛直下向きに放射される電波は少なくな
るが、l1が８分の１波長以下であれば、放射され
る電波も少なく、加熱に影響を与えない。 In FIG. 3, high-frequency electromagnetic waves are radiated from the rotating antenna 16 rotating inside the heating chamber 4. Depending on the dimensions of the heating chamber 4, the dimension l of the rotating antenna 16 on the heating chamber 4 side, which corresponds to the rotation axis. If 1 is too long, electromagnetic waves will be radiated from this rotating antenna 16, and the electromagnetic waves will not propagate to the tip of the rotating antenna 16. Furthermore, if the propagation impedance of the antennas A17 and B18 perpendicular to the rotating antenna 16 is high, they will radiate into the heating chamber 14, and the radio waves will not propagate to the tip of the antenna A17. Therefore, in order to lower the propagation impedance, the width dimensions of antenna A17 and antenna B18 are made larger than the distance between the heating chamber 4 wall and antenna A17 and antenna B18, that is, the dimension l 1 , thereby lowering the propagation impedance of radio waves and heating No radiation is emitted into room 4. However, a small amount of radio waves are radiated into the heating chamber 4. This is because the electric fields E 1 19 and E 2 20 of the antenna A 17 and the antenna B 18 are oriented in opposite directions, so they cancel each other out and do not substantially propagate into the heating chamber 4 . Note that the distance between the heating chamber 4 wall and antenna A17 and antenna B18, that is,
The shorter l 1 is, the less radio waves will reach the rotating shaft.
The number of radio waves radiated vertically downward from the rotation axis decreases, but if l 1 is one-eighth wavelength or less, the number of radio waves radiated is small and does not affect heating.
そしてアンテナＡ１７とアンテナＢ１８の長さ
の差だけで加熱室４内を励振する。そこでアンテ
ナＡ１７とアンテナＢ１８の長さの差を高周波電
磁波のほぼ４分の１にすることにより、長さの差
のある部分における逆方向の電界が生じないため
最も効率よくアンテナ先端より電波が放射され
る。またアンテナＡ１７を略直角に曲げているの
で垂直な電界E3２１によつて加熱室４内へ電波
が放射される。垂直な電界E3２１により加熱室
４を励振すると加熱室４に垂直な電界が励磁され
る。この垂直な電界は、電界方向と垂直な面を主
に有している負荷（食品など）、つまり平板状の
負荷に対して影響されにくい為、平板状の負荷で
種々の形状の負荷を加熱してもすべて均一に加熱
されるのである。しかしコツプなどの容器に入れ
た負荷（垂直な電界と同方向の長さを主に有する
負荷）に対しては、垂直な電界は影響されるがこ
れは均一加熱の必要性は前者の負荷よりもあまり
ないと思われる。 Then, the inside of the heating chamber 4 is excited only by the difference in length between the antenna A17 and the antenna B18. Therefore, by making the difference in length between antenna A17 and antenna B18 approximately one-fourth of the high-frequency electromagnetic wave, an electric field in the opposite direction will not occur in the part with the difference in length, so that radio waves can be radiated from the tip of the antenna most efficiently. be done. Further, since the antenna A17 is bent at a substantially right angle, radio waves are radiated into the heating chamber 4 by the vertical electric field E 3 21. When the heating chamber 4 is excited by the vertical electric field E 3 21, an electric field perpendicular to the heating chamber 4 is excited. This vertical electric field is not easily affected by loads that mainly have a plane perpendicular to the direction of the electric field (such as food), that is, flat loads, so loads of various shapes can be heated with flat loads. However, everything is heated evenly. However, for loads placed in containers such as pots (loads that mainly have a length in the same direction as the vertical electric field), the vertical electric field is affected, but the need for uniform heating is greater than that of the former load. It seems that there are not many.
第４図は本発明の他の実施例である。 FIG. 4 shows another embodiment of the invention.
第４図において加熱室４内に封口板２２取り付
ける為の金属のふくらみ部２３や、導波管２０と
加熱室４とを取りつける為のビス２４などがある
と、加熱室４壁が実質的に下側にふくらんでいる
ので、アンテナＡ１７、アンテナＢ１８の電波の
伝搬を良くする為つまりl1の距離を一定にする為
にアンテナＡ１７、アンテナＢ１８を適宜曲げて
いる。 In FIG. 4, if there is a metal bulge 23 for attaching the sealing plate 22 in the heating chamber 4, a screw 24 for attaching the waveguide 20 and the heating chamber 4, etc., the wall of the heating chamber 4 is substantially Since the antennas bulge downward, the antennas A17 and B18 are bent appropriately in order to improve the propagation of radio waves from the antennas A17 and B18, that is, to keep the distance l1 constant.
以上のように本発明によれば次の効果を生ず
る。 As described above, the present invention provides the following effects.
(1) アンテナの先端迄電波が反射なく伝搬するの
で回転した時分布性能が著るしく向上する。(1) Since the radio waves propagate to the tip of the antenna without reflection, the distribution performance when rotating is significantly improved.
(2) 回転する垂直な電界のみで分布を均一にして
いるので負荷の変化に対して分布の均一度の変
化が少ない。(2) Since the distribution is made uniform only by a rotating vertical electric field, the uniformity of the distribution does not change much with changes in load.
(3) 水平の電界は打ち消し合つているので分布に
悪影響を及ぼす水平電界はほとんど生じない。(3) Since the horizontal electric fields cancel each other out, there is almost no horizontal electric field that adversely affects the distribution.
(4) 回転アンテナ部すなわち導波管と加熱室の結
合部の特性インピーダンス（伝搬インピーダン
ス）と、水平アンテナの特性インピーダンス
（伝搬インピーダンス）の変化が少ないので、
この間での電波の反射が少ない。(4) There is little change in the characteristic impedance (propagation impedance) of the rotating antenna part, that is, the coupling part between the waveguide and the heating chamber, and the characteristic impedance (propagation impedance) of the horizontal antenna.
There is little reflection of radio waves between these areas.
(5) アンテナＡ，Ｂは単なる平板状の板で構成で
きるので、安価に簡単に構成できる。(5) Since antennas A and B can be constructed from simple flat plates, they can be constructed easily and inexpensively.
(6) 回転軸に相当する回転アンテナより電波の放
射がないので、回転アンテナの回転効果が非常
に大きい。(6) Since there is no radio wave radiation compared to a rotating antenna that corresponds to the rotation axis, the rotation effect of a rotating antenna is very large.
第１図は本発明の一実施例である高周波加熱装
置の外観斜視図、第２図は同装置の側面断面図、
第３図は第２図の要部拡大断面図、第４図は本発
明の他の実施例の要部拡大断面図である。
４…加熱室、１２…高周波発振器、１３…導波
管、１６…回転アンテナ、１７…アンテナＡ、１
８…アンテナＢ。
FIG. 1 is an external perspective view of a high-frequency heating device that is an embodiment of the present invention, and FIG. 2 is a side sectional view of the same device.
3 is an enlarged sectional view of the main part of FIG. 2, and FIG. 4 is an enlarged sectional view of the main part of another embodiment of the present invention. 4... Heating chamber, 12... High frequency oscillator, 13... Waveguide, 16... Rotating antenna, 17... Antenna A, 1
8...Antenna B.
Claims (1)
に高周波電磁波を発振させる高周波発振器と、前
記高周波発振器の高周波電磁波を伝搬させる導波
管と、前記導波管と前記加熱室を連通する回転自
在な回転アンテナとを備え、前記回転アンテナの
前記加熱室側には回転軸に対してほぼ垂直な方向
でかつ前記回転軸の両側にそれぞれ延設されたア
ンテナＡ及びアンテナＢを有し、前記アンテナＡ
とアンテナＢの長さの差を前記高周波電磁波のほ
ぼ４分の１とし、前記アンテナＡの先端を４分の
１波長以内の長さで略直角に曲げるとともに、前
記アンテナＡとアンテナＢの巾寸法は、前記加熱
室壁と前記アンテナＡ及び前記アンテナＢとの距
離よりも大きくしてなる高周波加熱装置。1. A heating chamber that stores an object to be heated, a high-frequency oscillator that oscillates high-frequency electromagnetic waves in the heating chamber, a waveguide that propagates the high-frequency electromagnetic waves of the high-frequency oscillator, and a rotating device that communicates the waveguide and the heating chamber. a freely rotating antenna; on the side of the heating chamber of the rotating antenna, an antenna A and an antenna B extending in a direction substantially perpendicular to the rotation axis and on both sides of the rotation axis; antenna A
The difference in length between antenna A and antenna B is approximately one-fourth of the high-frequency electromagnetic wave, the tip of antenna A is bent at a substantially right angle to a length within one-quarter wavelength, and the width of antenna A and antenna B is The high frequency heating device has dimensions larger than the distance between the heating chamber wall and the antenna A and the antenna B.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57038441A JPS58155693A (en) | 1982-03-11 | 1982-03-11 | High frequency heater |
| AU12150/83A AU559648B2 (en) | 1982-03-11 | 1983-03-08 | Microwave oven with rotary antenna |
| US06/473,343 US4508946A (en) | 1982-03-11 | 1983-03-08 | Microwave oven with rotary antenna |
| DE19833308732 DE3308732A1 (en) | 1982-03-11 | 1983-03-11 | HIGH FREQUENCY HEATING UNIT WITH A ROTATING ANTENNA |
| GB08306769A GB2119210B (en) | 1982-03-11 | 1983-03-11 | Microwave oven with rotary antenna |
| GB08511716A GB2161050B (en) | 1982-03-11 | 1983-03-11 | Microwave oven with rotary antenna seal |
| CA000423454A CA1193326A (en) | 1982-03-11 | 1983-03-11 | Microwave oven with rotary antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57038441A JPS58155693A (en) | 1982-03-11 | 1982-03-11 | High frequency heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58155693A JPS58155693A (en) | 1983-09-16 |
| JPS6332235B2 true JPS6332235B2 (en) | 1988-06-29 |
Family
ID=12525383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57038441A Granted JPS58155693A (en) | 1982-03-11 | 1982-03-11 | High frequency heater |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS58155693A (en) |
| GB (1) | GB2119210B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03251621A (en) * | 1990-02-28 | 1991-11-11 | Matsushita Electric Ind Co Ltd | Air conditioner |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA1262374A (en) * | 1985-06-24 | 1989-10-17 | Ryuji Igarashi | High-frequency heating apparatus having a rotating waveguide |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5676190A (en) * | 1979-11-26 | 1981-06-23 | Matsushita Electric Ind Co Ltd | High frequency heater |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53120347U (en) * | 1977-03-03 | 1978-09-25 |
-
1982
- 1982-03-11 JP JP57038441A patent/JPS58155693A/en active Granted
-
1983
- 1983-03-11 GB GB08306769A patent/GB2119210B/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5676190A (en) * | 1979-11-26 | 1981-06-23 | Matsushita Electric Ind Co Ltd | High frequency heater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03251621A (en) * | 1990-02-28 | 1991-11-11 | Matsushita Electric Ind Co Ltd | Air conditioner |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2119210B (en) | 1986-11-26 |
| JPS58155693A (en) | 1983-09-16 |
| GB2119210A (en) | 1983-11-09 |
| GB8306769D0 (en) | 1983-04-20 |
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