JPS5840522Y2 - magnetron - Google Patents
magnetronInfo
- Publication number
- JPS5840522Y2 JPS5840522Y2 JP1978109512U JP10951278U JPS5840522Y2 JP S5840522 Y2 JPS5840522 Y2 JP S5840522Y2 JP 1978109512 U JP1978109512 U JP 1978109512U JP 10951278 U JP10951278 U JP 10951278U JP S5840522 Y2 JPS5840522 Y2 JP S5840522Y2
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- yoke
- radiator
- magnetron
- metal plate
- 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
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Description
【考案の詳細な説明】
本考案はフェライト永久磁石を内蔵するマグネトロンの
改良に関するものである。[Detailed Description of the Invention] The present invention relates to an improvement of a magnetron incorporating a ferrite permanent magnet.
電子レンジの普及に伴い、電子レンジに使用されるマグ
ネトロンに対する小形、軽量化、高信頼性、低価格化を
常に要求されている。With the spread of microwave ovens, there is a constant demand for magnetrons used in microwave ovens to be smaller, lighter, more reliable, and lower in price.
マグネトロンの大きさ、重量を決定する最も大きな要因
は磁石材料及び磁気回路の構成であり、現在量も小形軽
量化を計りうるマグネトロンの1つは、希土類磁石、又
はアルニコ磁石を真空管内に内蔵する構造のものである
。The biggest factors that determine the size and weight of a magnetron are the magnet material and the configuration of the magnetic circuit, and one of the current magnetrons that can be made smaller and lighter is one that incorporates rare earth magnets or alnico magnets inside the vacuum tube. It is of structure.
しかし、これらはいずれも磁石からのガス放出が多く信
頼性に不安があること、価格が高い等の理由で主流にな
っていない。However, none of these have become mainstream because of the large amount of gas released from the magnet, which raises concerns about reliability, and their high prices.
次に小形軽量化を計りうる構造のマグネトロンは円板状
フェライト磁石を発振管の上下に配設したいわゆるフェ
ライト磁石内磁型である。Next, a magnetron with a structure that allows for reduction in size and weight is a so-called ferrite magnet-in-magnet type in which disc-shaped ferrite magnets are placed above and below an oscillation tube.
この構造の代表的なものを第1図に示す。A typical example of this structure is shown in FIG.
同図の符号1は発振管本体、2は陰極ステム部、3は出
力部、4 a 、4 bはフェライト磁石、5 a 、
5 bは磁石の硫束を本体の磁極片(図示せず)に有効
に導くための導磁板、6はラジェータ、7はヨーク、8
はガスケット、9はシールドボックス、10はコンテ゛
ンサー、11は絶縁物、12はチョークコイルをあられ
している。In the figure, 1 is the oscillation tube body, 2 is the cathode stem part, 3 is the output part, 4 a and 4 b are ferrite magnets, 5 a,
5 b is a magnetic conduction plate for effectively guiding the sulfur flux of the magnet to the magnetic pole piece (not shown) of the main body, 6 is a radiator, 7 is a yoke, and 8
1 is a gasket, 9 is a shield box, 10 is a capacitor, 11 is an insulator, and 12 is a choke coil.
このような構造のマグネトロンを更に小形・軽量化する
1つの方法として上記円筒状フェライト磁石4 a 、
4 bの内径を小さくする方法がある。One way to further reduce the size and weight of a magnetron with such a structure is to use the cylindrical ferrite magnet 4a,
4 There is a method to reduce the inner diameter of b.
フェライト磁石の内径を小さくすると磁石の有効利用を
計ることができ、例えば磁極間寸法を14mm、磁極の
平らな頂面の直径を14mm、磁石外径60mm、磁石
厚さlQmmとした場合、磁石内径と作用空間中心磁界
Bgの関係は第2図のようになる。By reducing the inner diameter of the ferrite magnet, the magnet can be used more effectively. For example, if the distance between the magnetic poles is 14 mm, the diameter of the flat top surface of the magnetic poles is 14 mm, the outer diameter of the magnet is 60 mm, and the thickness of the magnet is 1Q mm, the inner diameter of the magnet is The relationship between Bg and the working space center magnetic field Bg is as shown in FIG.
第2図から磁石内径を小さくすればBgは増大すること
がわかる。It can be seen from FIG. 2 that Bg increases if the inner diameter of the magnet is made smaller.
マグネトロンの場合、陽極半径、陰極半径、陽極電圧、
陽極電流が決まると必要な中心磁界Bgは定まるので、
磁石内径を小さぐすれば磁石全体を小形にすることが可
能である。For magnetrons, anode radius, cathode radius, anode voltage,
Once the anode current is determined, the necessary central magnetic field Bg is determined, so
By reducing the inner diameter of the magnet, it is possible to make the entire magnet smaller.
この効果は磁石内径を小さくする程顕著であるが、第1
図かられかるように、磁石の内側を陰極ステム部、陽極
出力部が各々貫通するのでむやみに小さくすることはで
きない。This effect becomes more pronounced as the inner diameter of the magnet becomes smaller;
As can be seen from the figure, since the cathode stem section and the anode output section each pass through the inside of the magnet, it is impossible to make it smaller unnecessarily.
実際に磁石形状を小形にするためには外径を小さくする
方法、厚さを薄くする方法、あるいはこれら2つを組合
せる方法があるが、磁石の有効利用、対低温減磁特性、
機械的強度、その化マグネ1ヘロンの外形寸法的制約か
らフェライト磁石を使用したマヴネトロン磁気回路のパ
ーミアンス係数は1〜1.5が望ましい。In order to actually make the magnet smaller, there are methods to reduce the outer diameter, thinner thickness, or a combination of the two, but effective use of the magnet, low-temperature demagnetization characteristics,
The permeance coefficient of the Mavnetron magnetic circuit using ferrite magnets is preferably 1 to 1.5 in view of mechanical strength and external dimension constraints of the magnet.
このような検討を行なった磁石寸法の1例として、24
50 MHz 600 Wの出力のもので磁極間隙を1
4mm、磁極頂面直径を14mm、中心磁界Bgを17
00 G (ガウス)とすると実用的な磁石寸法は下表
のようになる。As an example of magnet dimensions for which such consideration was made, 24
50 MHz 600 W output with magnetic pole gap of 1
4mm, magnetic pole top surface diameter 14mm, center magnetic field Bg 17
Assuming 00 G (Gauss), practical magnet dimensions are as shown in the table below.
(磁石特性Br≧4100 (G) 、Hc≧2800
(Oe ) 、 BHmax > 4 MGOe)フ
ェライト磁石の欠点の1つとして磁石特性の温度依存性
が大きいことがある。(Magnetic characteristics Br≧4100 (G), Hc≧2800
(Oe), BHmax > 4 MGOe) One of the drawbacks of ferrite magnets is that their magnetic properties are highly dependent on temperature.
即ち温度が上昇すると残留磁束密度Brが小さくなり、
通常マグネトロンの使用条件範囲一20〜100℃では
−0,2%/℃程度Brが変化する。That is, as the temperature rises, the residual magnetic flux density Br decreases,
Normally, in the operating condition range of magnetrons -20 to 100°C, Br changes by about -0.2%/°C.
マグネトロンの基体機能は低周波電力(含直流)を高周
波電力に変換することであるが、この電力変換効率は通
常70%程度であり、約30%は熱損失になる。The basic function of a magnetron is to convert low frequency power (including direct current) into high frequency power, but the power conversion efficiency is usually about 70%, and about 30% is heat loss.
この熱損失は第1図に示したラジェータ6により外部に
発散するが、通常の電子レンジに使用し使用条件が悪い
と陽極外周温度は約200℃にも達することがある。This heat loss is dissipated to the outside by the radiator 6 shown in FIG. 1, but if the anode is used in a normal microwave oven and the operating conditions are poor, the temperature around the anode may reach about 200°C.
陽極に近接する磁石温度は第3図に矢印で示すような経
路で温度上昇する。The temperature of the magnet near the anode increases along the path shown by the arrow in FIG.
即ち陽極に発生する熱はラジェータ6、このラジェータ
外側面が熱的に接触されているヨーク7を経て磁石4
a 、4 bに達する経路と、導磁板5 a 、5 b
を通して磁石に達する2つの経路がある。That is, the heat generated at the anode is transferred to the magnet 4 via the radiator 6 and the yoke 7 with which the outer surface of the radiator is in thermal contact.
a, 4b and the magnetic conduction plates 5a, 5b
There are two paths to the magnet through.
これら2つの経路から入った熱エネルギーは磁石の表面
を流れる冷却風を熱交換しながら持ち去られるエネルギ
ーと平衡して磁石温度が決まる。The thermal energy that enters from these two paths is balanced with the energy carried away while exchanging heat with the cooling air flowing on the surface of the magnet, and the magnet temperature is determined.
ここで磁石が小形になった場口の磁石温度を考えると、
次のような不利な点がある。Now, if we consider the temperature of the magnet at the mouth when the magnet becomes smaller,
It has the following disadvantages:
(1)表面積が小さいので冷却による熱交換量が少なく
、磁石温度が上昇しやすい。(1) Since the surface area is small, the amount of heat exchanged by cooling is small, and the magnet temperature tends to rise.
(2)冷却風が通り抜は易い空間14 a 、14 b
が大きくなり、同一風量で考えると磁石表面の風速が下
り熱交換量が少なくなる。(2) Spaces 14a and 14b through which cooling air can easily pass through
increases, and considering the same air volume, the wind speed on the magnet surface decreases and the amount of heat exchange decreases.
(3)上記(2)と同様にラジェータ6を有効に冷却す
る風量も少なくなるので陽極全体の温度が上昇する。(3) Similar to (2) above, the amount of air that effectively cools the radiator 6 also decreases, so the temperature of the entire anode increases.
このようにして磁石内径を小さくして磁石を小形軽量に
することは経済的に非常に有利であるが、磁石の温度が
上昇し、その結果磁力が低下して動作安定度が低下しや
すくなる。Making the magnet smaller and lighter by reducing the inner diameter of the magnet in this way is economically very advantageous, but the temperature of the magnet increases, resulting in a decrease in magnetic force and operational stability. .
本考案は以上のような事情に鑑みてなされたもので、磁
石を小型:軽量にして且つ従来品特性を満足する性能を
有するマグネトロンを提供するものである。The present invention has been made in view of the above circumstances, and aims to provide a magnetron that has a smaller and lighter magnet and has performance that satisfies the characteristics of conventional products.
本考案の代表例の冷却に関する部分を第4図に、本考案
の要部平面図を第5図Aに、側面図を第5図Bに示し、
これら第4図、第5図A、第5図Bを参照しながら本考
案を説明する。A representative example of the present invention relating to cooling is shown in FIG. 4, a plan view of the main part of the present invention is shown in FIG. 5A, and a side view is shown in FIG. 5B.
The present invention will be explained with reference to FIG. 4, FIG. 5A, and FIG. 5B.
本考案は、発振管本体13上に円筒状フェライト磁石2
1a、21bを同軸的に配設し外側を強磁性体ヨーク7
で囲こむとともに管本体13の外周にとりつけたラジェ
ータ6の外側面をヨーク7の内側面に伝熱的に接触させ
た構造のマグネトロンにおいて、磁石21a、21bの
外端磁極面とこれに磁気的に結合されるヨーク7の平板
部との間にこの磁石極面の面積よりも大なる面積を有す
る強磁性材料製の金属板15.16を介在して設けると
ともに、磁石の外周側面とヨークの内側面との間の冷却
風が素通りしようとする空間を遮るように遮風板19
a 、19 b 、20 a 、20 bをコノ金属板
の周辺部に一体的に設けたものである。The present invention has a cylindrical ferrite magnet 2 on the oscillation tube body 13.
1a and 21b are arranged coaxially, and the outside is covered with a ferromagnetic yoke 7.
In the magnetron, the outer surface of the radiator 6 attached to the outer periphery of the tube body 13 is in heat conductive contact with the inner surface of the yoke 7. A metal plate 15, 16 made of a ferromagnetic material having an area larger than the area of the pole face of this magnet is interposed between the flat plate part of the yoke 7 coupled to the magnet and the outer circumferential side of the magnet and the yoke. A wind shield plate 19 is installed so as to block the space through which the cooling air between the inside surface and the inside surface is going to pass through.
a , 19 b , 20 a , and 20 b are integrally provided around the periphery of the metal plate.
同図の実施例では更に、金属板15.16に衝立状に設
けた遮風板19 a 、19 b 、20 a 、20
bは前記空間部を冷却風が容易に素通りしないように
するとともにこの遮風板に当たる冷却風が磁石に当って
磁石を効率よく冷却するように斜めに設けられている。In the embodiment shown in the figure, wind shielding plates 19 a , 19 b , 20 a , 20 provided in a screen-like manner on the metal plates 15 and 16 are further provided.
b is provided diagonally so that the cooling air does not easily pass through the space, and the cooling air that hits the wind shield plate hits the magnet and efficiently cools the magnet.
なおこの実施例では金属板のヨークに対向する面側に小
突起17.18を設けである。In this embodiment, small protrusions 17 and 18 are provided on the side of the metal plate facing the yoke.
こうして遮風板を有する強磁性材料製金属板を磁石とヨ
ークとの間に介在させることによって、ラジェータから
ヨークを伝わって磁石に伝わろうとする熱および磁石に
伝わった熱を外部に導き出しラジェータおよびヨークの
内側空間に導入される冷却風に熱放散させ磁石の温度上
昇を抑制することができる。In this way, by interposing a metal plate made of a ferromagnetic material with a wind shield between the magnet and the yoke, the heat that is about to be transmitted from the radiator to the magnet via the yoke and the heat that has been transmitted to the magnet is guided outside, and the heat that has been transmitted to the magnet is guided to the outside. The temperature rise of the magnet can be suppressed by dissipating heat through the cooling air introduced into the inner space of the magnet.
しかも面積の広い強磁性材料製金属板を介在させること
によりヨークから磁石への磁気抵抗を不所望に増大させ
ることがない。Moreover, by interposing the metal plate made of a ferromagnetic material with a large area, the magnetic resistance from the yoke to the magnet does not increase undesirably.
以上の構造を有する本考案マグネトロンは、フェライト
磁石を小形にしても次の理由により簡単な構造で磁石の
温度上昇が抑制でき特性の安定化を得ることができる。In the magnetron of the present invention having the above structure, even if the ferrite magnet is made small, the temperature rise of the magnet can be suppressed and the characteristics stabilized with a simple structure for the following reason.
(1)ラジェータからこれに接するヨークを経て伝導す
る熱が、ヨークの平板部と磁石との間に介在された金属
板およびその周辺部に一体的に設けられた遮風板で熱放
散され磁石の温度上昇が抑制される。(1) The heat conducted from the radiator through the yoke in contact with the radiator is dissipated by the metal plate interposed between the flat plate part of the yoke and the magnet, and the wind shield plate integrally provided around the yoke. temperature rise is suppressed.
(2)金属板に一体的に設けられた遮風板により磁石の
外周側面とヨーク内側面との間の空間に、ここを素通り
しようとする冷却風を遮ぎる形で配置されているので、
冷却に寄与しない風が少なくなり、発振管本体および磁
石の冷却が助長される。(2) Since the wind shield plate is integrally provided on the metal plate and is placed in the space between the outer circumferential side of the magnet and the inner side of the yoke, it blocks the cooling air that tries to pass through the space.
The amount of wind that does not contribute to cooling is reduced, and cooling of the oscillation tube body and magnet is facilitated.
そしてこの作用とともにこの遮風板は上記(1)の作用
をも同時に兼ね備えているので部品点数が少なくてすむ
。In addition to this function, this wind shield plate also has the function (1) above, so that the number of parts can be reduced.
(3〕遮風板を金属板の周辺部に一体的に設けであるた
め、製作が比較的容易であり、且つ組立ても簡単である
。(3) Since the wind shield plate is integrally provided around the metal plate, it is relatively easy to manufacture and easy to assemble.
(4)遮風板は磁石の外側磁極面とヨーク平板部との間
に介在された金属板に設けられ、薄板状で且つ磁石の外
周側面に対してその幅のせまい端面で対面しているので
、磁石からヨークへの磁気漏洩の増加をほとんど生じな
い。(4) The wind shield plate is provided on a metal plate interposed between the outer magnetic pole surface of the magnet and the yoke flat plate, and has a thin plate shape and faces the outer circumferential side of the magnet with its narrow end face. Therefore, there is almost no increase in magnetic leakage from the magnet to the yoke.
なお本考案では、磁石の外径を小さくできるので、磁石
の内端磁極面を本体13の両端に設けられた磁極片13
aに直接液するように配置しうる。In addition, in the present invention, since the outer diameter of the magnet can be made small, the inner end magnetic pole surface of the magnet can be attached to the magnetic pole pieces 13 provided at both ends of the main body 13.
It can be arranged so that it directly flows into a.
なおこれらの図では本体13を構成する共振空胴部、陰
極、陰極ステム部、あるいは出力部の記載を省略しであ
る。Note that in these figures, the resonance cavity, cathode, cathode stem, or output section that constitutes the main body 13 is omitted.
本考案における金属板15.16は、上記のように磁石
の熱を外部に導き出し放散させるとともにヨークと磁石
との間の磁気抵抗を増大させないために鉄のような強磁
性体の薄板を用いている。The metal plates 15 and 16 in the present invention are made of thin plates of ferromagnetic material such as iron in order to guide and dissipate the heat of the magnet to the outside and to prevent the magnetic resistance between the yoke and the magnet from increasing. There is.
更に本考案の金属板に別の機能を持たせ特性の良いマグ
ネトロンを提供することができる。Furthermore, by providing the metal plate of the present invention with other functions, it is possible to provide a magnetron with good characteristics.
即ち第6図および第7図に示す如く、磁石21 bから
外に出ている金属板15の一部を折り曲げ、この折り曲
げ片24の近傍のヨーク、シールドボックスに電波漏洩
を生じない程度の大きさの穴26.27をあける。That is, as shown in FIGS. 6 and 7, a part of the metal plate 15 protruding from the magnet 21b is bent, and the bent piece 24 is bent to a size large enough to prevent leakage of radio waves to the yoke and shield box near the bent piece 24. Drill the holes 26 and 27.
マグネトロンの冷却風(矢印23)は金属板折り曲げ片
24にぶつかりヨーク、シールドボックスの穴26.2
7をとおしてシールドボックス内に入り、第6図矢印の
ように流れるためシールドボックス内の陰極ステム部、
フィルター素子、絶縁物(いずれも図示せず)等の冷却
に非常に効果的である。The magnetron's cooling air (arrow 23) hits the metal plate bent piece 24 and the hole 26.2 in the yoke and shield box.
7 into the shield box and flows as shown by the arrow in Figure 6, the cathode stem inside the shield box,
It is very effective for cooling filter elements, insulators (none of which are shown), etc.
そして4枚の遮風板19a、19bは金属板15そのも
のの周辺部を折り曲げ形威しである。The four wind shielding plates 19a and 19b are formed by bending the periphery of the metal plate 15 itself.
本考案の金属板は第4図で2つの磁石とヨークとの間に
各々配設しであるが、マグネトロン全体の構造、目的に
よりいずれか片方でも効果があることは勿論である。Although the metal plates of the present invention are respectively disposed between two magnets and a yoke in FIG. 4, it goes without saying that either one of them may be effective depending on the overall structure and purpose of the magnetron.
第1図は従来のフェライトマグネット内磁形マグネトロ
ンの一部断面図、第2図はマグネット内径とBgの関係
を示す特性図、第3図はマグネットへの熱エネルギー価
達経路を図式的に示す図、第4図は本考案の一実施例を
示し冷却に関する要部の断面略図、第5図A、Bはその
平面図及び側面図、第6図は本考案の他の実施例を示す
要部断面略図、第7図は金属板形状の斜視図である。
6・・・・・・ラジェータ、7,25・・・・・・ヨー
ク、13・・・・・・管本体、15,16・・・・・・
金属板、19 a 、19 b 、20 a 、20
b ・−・−・・遮風板、21a、21b・・・・・・
磁石。Figure 1 is a partial cross-sectional view of a conventional magnetron with a ferrite magnet, Figure 2 is a characteristic diagram showing the relationship between the magnet inner diameter and Bg, and Figure 3 is a diagram schematically showing the path of thermal energy reaching the magnet. 4 shows an embodiment of the present invention, and is a schematic cross-sectional view of the main parts related to cooling. FIGS. 5A and 5B are plan and side views thereof, and FIG. A schematic partial cross-sectional view, and FIG. 7 is a perspective view of a metal plate shape. 6...Radiator, 7,25...Yoke, 13...Pipe body, 15,16...
Metal plate, 19a, 19b, 20a, 20
b ・−・−・・Wind shielding plate, 21a, 21b・・・・・・
magnet.
Claims (1)
状フェライト永久磁石を同軸的に配設し、これら本体、
ラジェータおよび磁石を包囲して磁気回路を構成する口
字状のヨークを有し、上記ラジェータの外側面を前記ヨ
ークの内側面に伝熱的に接合してなるマグネトロンにお
いて、上記磁石の外端磁極面とヨーク平板部との間に、
面積が該磁石の磁極面面積よりも大きい強磁性材料製の
金属板を介在させるとともに、該金属板の周辺部に一体
的に遮風板を設は該遮風板を前記磁石の外周側面とヨー
ク内側面との間の空間に冷却風の素通りを遮ぎる形で突
設させてなることを特徴とするマグネトロン。A cylindrical ferrite permanent magnet is coaxially arranged on the oscillation tube body, which has a radiator attached to its outer periphery.
A magnetron having a radiator-shaped yoke surrounding a radiator and a magnet to form a magnetic circuit, the outer surface of the radiator being thermally connected to the inner surface of the yoke, the outer end magnetic pole of the magnet between the surface and the yoke flat plate,
A metal plate made of a ferromagnetic material having an area larger than the magnetic pole surface area of the magnet is interposed, and a wind shield plate is integrally provided around the periphery of the metal plate, so that the wind shield plate is connected to the outer peripheral side surface of the magnet. A magnetron is characterized by a protruding structure that blocks the passage of cooling air in the space between the inner surface of the yoke.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1978109512U JPS5840522Y2 (en) | 1978-08-11 | 1978-08-11 | magnetron |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1978109512U JPS5840522Y2 (en) | 1978-08-11 | 1978-08-11 | magnetron |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5527806U JPS5527806U (en) | 1980-02-22 |
JPS5840522Y2 true JPS5840522Y2 (en) | 1983-09-12 |
Family
ID=29055538
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1978109512U Expired JPS5840522Y2 (en) | 1978-08-11 | 1978-08-11 | magnetron |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5840522Y2 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5327755B2 (en) * | 1971-08-17 | 1978-08-10 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52130650U (en) * | 1976-03-30 | 1977-10-04 | ||
JPS5327755U (en) * | 1976-08-16 | 1978-03-09 |
-
1978
- 1978-08-11 JP JP1978109512U patent/JPS5840522Y2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5327755B2 (en) * | 1971-08-17 | 1978-08-10 |
Also Published As
Publication number | Publication date |
---|---|
JPS5527806U (en) | 1980-02-22 |
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