JPS5925937B2 - microwave heating furnace - Google Patents
microwave heating furnaceInfo
- Publication number
- JPS5925937B2 JPS5925937B2 JP1292379A JP1292379A JPS5925937B2 JP S5925937 B2 JPS5925937 B2 JP S5925937B2 JP 1292379 A JP1292379 A JP 1292379A JP 1292379 A JP1292379 A JP 1292379A JP S5925937 B2 JPS5925937 B2 JP S5925937B2
- Authority
- JP
- Japan
- Prior art keywords
- heating furnace
- microwave heating
- microwave
- granules
- furnace according
- 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
Landscapes
- Constitution Of High-Frequency Heating (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
Description
【発明の詳細な説明】
この発明は、マイクロ波で物質を加熱するマイクロ波加
熱炉に関し、特に、高温かつ均一な加熱を達成するため
の改良に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave heating furnace for heating substances with microwaves, and in particular to an improvement for achieving high temperature and uniform heating.
たとえば、セラミックスや陶器または酸化亜鉛を主成分
とする金属酸化物の焼成体などを作るために、マイクロ
波加熱炉が考えられる。For example, a microwave heating furnace can be used to produce ceramics, pottery, or fired bodies of metal oxides containing zinc oxide as a main component.
従来、この種のマイクロ波加熱炉として、第１図に示す
ものがある。第１図において、１はマイクロ波発生装置
、２は導波管、３はオープン、４は被加熱物で、マイク
ロ波発生装置１で発生したマイクロ波は導波管２を介し
てオープン３内に導かれる。オープン３内には、各種モ
ードの共振電磁界が発生Ｌオープン３の中に置かれた被
加熱物４はこのマイクロ波電磁界により加熱される。従
来のマイクロ波加熱装置は以上のように構成されている
ので、電界の不均一が被加熱物４の加熱むらになる。Conventionally, there is a microwave heating furnace of this type as shown in FIG. In Fig. 1, 1 is a microwave generator, 2 is a waveguide, 3 is an open, and 4 is an object to be heated.The microwave generated by the microwave generator 1 is passed through the waveguide 2 into the open 3. guided by. Inside the open 3, resonant electromagnetic fields of various modes are generated.The object to be heated 4 placed inside the L open 3 is heated by this microwave electromagnetic field. Since the conventional microwave heating device is configured as described above, non-uniformity of the electric field causes uneven heating of the object 4 to be heated.
また被加熱物４の温度は、輻射や自然対流などによる熱
放散のため、セラミツクスなどの焼成に必要な１０００
℃以上に加熱することは極めて困難であつた。今、被加
熱物４として直径７ｃ７ｎの黒体球を想定すると、周囲
温度を２０℃とすれば１０００℃における輻射による熱
放散Ｑ１は自然対流（熱伝達率を１０ｋｃａ１／Ｍ２ｈ
ｄｅｇとする）による熱放散Ｑ２は、ＫＣａｔ／ｈ＋１
７７Ｗ
となる。In addition, the temperature of the heated object 4 is lower than 1,000 yen, which is necessary for firing ceramics etc., due to heat dissipation by radiation, natural convection, etc.
It was extremely difficult to heat it above ℃. Now, assuming a black body sphere with a diameter of 7c7n as the heated object 4, if the ambient temperature is 20℃, the heat dissipation Q1 by radiation at 1000℃ is due to natural convection (heat transfer coefficient is 10kca1/M2h
The heat dissipation Q2 due to deg is KCat/h+1
It becomes 77W.
従つて、マイクロ波入力として２ｋｗ以上が必要となる
。この発明は上述のような従来のものの欠点を除去する
ためになされたもので、被加熱物を均一にかつ小入力で
高温度に加熱することのできるマイクロ波加熱炉を提供
することを目的としている。Therefore, a microwave input of 2 kW or more is required. This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and its purpose is to provide a microwave heating furnace that can uniformly heat an object to a high temperature with a small input. There is.
以下、この発明の一実施例を図について説明する。第２
図はこの発明の一実施例の断面図で、５はアルミナ磁器
などの高耐熱性で大きな熱伝導性を有する物質で形成さ
れ、被加熱物４を内部に収容しうるように構成された内
側容器、６は内側容器５の周囲をとＤまくように充填さ
れた酸化亜鉛を主成分とする金属酸化物などの高耐熱性
でかつマイクロ波損失の大きい物質で形成された発熱用
の粒体、７は粒体６で内側容器５を埋設せる形で収容す
るマイクロ波損矢の小さい耐火断熱材（例え，ばＪＩＳ
Ａ類７種）で形成された外側容器である。このように構
成された加熱炉は、外側容器７のマイクロ波損失が小さ
いので、マイクロ波の減衰がほとんど生ぜず、粒体６が
加熱され次第に温度が上昇する。An embodiment of the present invention will be described below with reference to the drawings. Second
The figure is a cross-sectional view of one embodiment of the present invention, and 5 is an inner side made of a material having high heat resistance and high thermal conductivity, such as alumina porcelain, and configured to accommodate a heated object 4 therein. The container 6 is a heat-generating granule made of a substance with high heat resistance and high microwave loss, such as a metal oxide whose main component is zinc oxide, which is filled so as to surround the inner container 5. , 7 is a fireproof insulation material with small microwave loss (for example, JIS
The outer container is made of 7 types of Class A). In the heating furnace configured in this manner, the microwave loss in the outer container 7 is small, so there is almost no attenuation of the microwaves, and the temperature gradually increases as the granules 6 are heated.
この場合、外側容器７は熱輻射をしや断するので、効率
よく、かつ高温度に加熱される。内側容器５は、マイク
ロ波によ勺高温度に加熱された粒体６によ勺加熱される
。内側容器５は熱伝導性の大きな物質で形成されている
から内側容器５全体が均一に高温度とな抵その内部には
均一な熱輻射場が形成される。従つて、内側容器５内に
置かれた被加熱物４は均一にかつ高温に加熱される。こ
のように、マイクロ波照射により発熱する物質を粒体と
し、被加熱物を収容する高耐熱性で大きな熱伝導性を有
する物質で形成せる内側容器の１周囲をこの粒体で埋設
した形でマイクロ波損失の小さい断熱材で形成せる外側
容器内に収める構成としたので製作が困難な発熱物質の
容器を製作する必要がなく、また内側容器の輻射熱で加
熱するので被加熱物の表面仕上力が発熱体に直接接する
場合に比べて美麗なものとすることができる。In this case, the outer container 7 blocks thermal radiation and is therefore efficiently heated to a high temperature. The inner container 5 is heated by the granules 6 which are heated to a very high temperature by microwaves. Since the inner container 5 is made of a highly thermally conductive material, the temperature of the entire inner container 5 is uniformly high, and a uniform heat radiation field is formed inside the inner container 5. Therefore, the object to be heated 4 placed in the inner container 5 is uniformly heated to a high temperature. In this way, a substance that generates heat when exposed to microwaves is made into particles, and the particles are embedded around one side of the inner container, which is made of a material with high heat resistance and high thermal conductivity, and which accommodates the object to be heated. Since the structure is such that the outer container is made of an insulating material with low microwave loss, there is no need to manufacture a container for the heat-generating substance, which is difficult to manufacture.In addition, since the heating is performed using the radiant heat of the inner container, the surface finish of the heated object is improved. It can be made more beautiful than when it is in direct contact with the heating element.
な卦、上述の実施例では粒体６を構成するマイクロ波発
熱物質として、酸化亜鉛を主成分とする金属酸化物を用
いた／ｌζ炭化硅素を主成分とする化合物半導体、ラン
タレクロマイト（ＬａＣｒＯ３）″を主成分とする化合
物半導体、ジルコニア（ＺｒＯ２）を主成分とする物体
などのマイクロ波損失が大きくかつ耐熱性の優れた物質
であつて、粒状を維持できるものであれば何れも使用で
きる。また外側容器７を構成する耐火断熱体としては、
発泡アルミナ磁器なども好適である。以上のように、こ
の発明によれば、被加熱物を収容する高耐熱性で大きな
熱伝導性を有する内側容器を高耐熱性でかつマイクロ波
損失の大きい物質からなる発熱用の粒体で埋設せる形で
マイクロ波損失の小さい耐火断熱体からなる外側容器内
に収め、この外側容器をとおしてマイクロ波を照射して
粒体を発熱させる構成としたので、被加熱物を均一にか
つ高温に効率よく加熱できるマイクロ波加熱炉が得られ
る。In the above-mentioned embodiment, a metal oxide containing zinc oxide as the main component was used as the microwave heating substance constituting the particles 6. )", any substance that has high microwave loss and excellent heat resistance, such as a compound semiconductor whose main component is zirconia (ZrO2), and which can maintain its granularity, can be used. .Furthermore, as a fireproof insulator constituting the outer container 7,
Foamed alumina porcelain and the like are also suitable. As described above, according to the present invention, the inner container that houses the object to be heated and has high heat resistance and large thermal conductivity is embedded with heat generating particles made of a material that is highly heat resistant and has a large microwave loss. The granules are housed in an outer container made of a refractory heat insulator with low microwave loss, and microwaves are irradiated through the outer container to generate heat in the granules, so the object to be heated can be heated uniformly and at high temperatures. A microwave heating furnace that can heat efficiently can be obtained.
第１図は従来のマイクロ波加熱炉の概念を示す断面図、
第２図はこの発明の一実施例の断面図である。
図において、１はマイクロ波発生装置、２は導波管、３
はオープン、４は被加熱物、５は内側容器、６は加熱粒
子、７は外側容器である。Figure 1 is a cross-sectional view showing the concept of a conventional microwave heating furnace.
FIG. 2 is a sectional view of one embodiment of the present invention. In the figure, 1 is a microwave generator, 2 is a waveguide, and 3 is a microwave generator.
is open, 4 is an object to be heated, 5 is an inner container, 6 is a heating particle, and 7 is an outer container.
Claims (1)
炉。 （イ）高耐熱性で大きな熱伝導性を有する物質よりなり
、内部に被加熱物を収容する内側容器。（ロ）耐火断熱
性でマイクロ波損失の小さい物質よりなり、内側容器を
収容する外側容器。（ハ）外側容器と内側容器との間に
充填された高耐熱性でマイクロ波損失の大きい物質より
なる粒体。 （ニ）外側容器をとおして粒体にマイクロ波を照射する
マイクロ波照射装置。 ２ 内側容器がアルミナ磁器である特許請求の範囲第１
項記載のマイクロ波加熱炉。 ３ 外側容器が耐火断熱レンガ（ＪＩＳ Ａ類７種）で
ある特許請求の範囲第１項に記載のマイクロ波加熱炉。 ４ 外側容器が発泡アルミナ磁器である特許請求の範囲
第１項に記載のマイクロ波加熱炉。 ５ 粒体が酸化亜鉛を主成分とする金属酸化物で形成さ
れている特許請求の範囲第１項に記載のマイクロ波加熱
炉。 ６ 粒体が炭化硅素を主成分とする化合物半導体である
特許請求の範囲第１項に記載のマイクロ波加熱炉。 ７ 粒体がランタンクロマイト（ＬａＣｒＯ＿３）を主
成分とする化合物半導体である特許請求の範囲第１項に
記載のマイクロ波加熱炉。 ８ 粒体がジルコニア（ＺｒＯ＿２）を主成分とする物
質である特許請求の範囲第１項に記載のマイクロ波加熱
炉。[Claims] 1. A microwave heating furnace comprising the following (a) to (d). (a) An inner container that is made of a material that is highly heat resistant and has high thermal conductivity, and that houses the object to be heated inside. (b) An outer container that houses the inner container and is made of a material that is fireproof and insulating and has low microwave loss. (c) Particles made of a material with high heat resistance and high microwave loss, filled between the outer container and the inner container. (d) A microwave irradiation device that irradiates the granules with microwaves through the outer container. 2 Claim 1 in which the inner container is made of alumina porcelain
The microwave heating furnace described in Section 1. 3. The microwave heating furnace according to claim 1, wherein the outer container is a fireproof and insulating brick (JIS A type 7). 4. The microwave heating furnace according to claim 1, wherein the outer container is made of foamed alumina porcelain. 5. The microwave heating furnace according to claim 1, wherein the granules are formed of a metal oxide whose main component is zinc oxide. 6. The microwave heating furnace according to claim 1, wherein the granules are a compound semiconductor containing silicon carbide as a main component. 7. The microwave heating furnace according to claim 1, wherein the granules are a compound semiconductor containing lanthanum chromite (LaCrO_3) as a main component. 8. The microwave heating furnace according to claim 1, wherein the granules are a substance containing zirconia (ZrO_2) as a main component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1292379A JPS5925937B2 (en) | 1979-02-06 | 1979-02-06 | microwave heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1292379A JPS5925937B2 (en) | 1979-02-06 | 1979-02-06 | microwave heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55105188A JPS55105188A (en) | 1980-08-12 |
| JPS5925937B2 true JPS5925937B2 (en) | 1984-06-22 |
Family
ID=11818847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1292379A Expired JPS5925937B2 (en) | 1979-02-06 | 1979-02-06 | microwave heating furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5925937B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008251762A (en) * | 2007-03-30 | 2008-10-16 | Tdk Corp | Manufacturing method of rare earth sintered magnet |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61110948U (en) * | 1984-12-25 | 1986-07-14 | ||
| JPS61110947U (en) * | 1984-12-25 | 1986-07-14 | ||
| JPH025225Y2 (en) * | 1984-12-25 | 1990-02-08 | ||
| JPS62169913A (en) * | 1986-01-22 | 1987-07-27 | Ebara Res Co Ltd | Disposing method and device for organic chlorine series compound or waste containing organic chlorine series compound |
| JP2003075077A (en) * | 2001-09-05 | 2003-03-12 | Natl Inst For Fusion Science | Microwave firing furnace and microwave firing method |
| US7715280B2 (en) | 2002-09-19 | 2010-05-11 | Citizen Holdings Co., Ltd. | Electronic clock |
| WO2006103697A1 (en) * | 2005-03-31 | 2006-10-05 | Bharat Heavy Electricals Limited | Rapid and homogenous heat treatment of large metallic sample using high power microwaves |
-
1979
- 1979-02-06 JP JP1292379A patent/JPS5925937B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008251762A (en) * | 2007-03-30 | 2008-10-16 | Tdk Corp | Manufacturing method of rare earth sintered magnet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55105188A (en) | 1980-08-12 |
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