JPH0578889B2 - - Google Patents
Info
- Publication number
- JPH0578889B2 JPH0578889B2 JP26912186A JP26912186A JPH0578889B2 JP H0578889 B2 JPH0578889 B2 JP H0578889B2 JP 26912186 A JP26912186 A JP 26912186A JP 26912186 A JP26912186 A JP 26912186A JP H0578889 B2 JPH0578889 B2 JP H0578889B2
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- hole
- diameter
- flange portion
- sealed tube
- 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 - Fee Related
Links
- 229910000859 α-Fe Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 description 6
- 230000004907 flux Effects 0.000 description 3
- 230000005347 demagnetization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000000260 Warts Diseases 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 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
- 238000010586 diagram Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 201000010153 skin papilloma Diseases 0.000 description 1
Landscapes
- Microwave Tubes (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、電子レンジ等の高周波加熱機器に用
いられるマグネトロン装置、とくに、永久磁石を
含む外部磁気回路をマグネトロンに一体的に結合
してなる内磁型のマグネトロン装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetron device used in high-frequency heating equipment such as a microwave oven, and more particularly, to a magnetron device having an internal magnetic circuit formed by integrally coupling an external magnetic circuit including a permanent magnet to a magnetron. This relates to a type of magnetron device.
従来の技術
一般に、電子レンジ等に用いられる内磁型のマ
グネトロン装置は、第４図および第５図に示すよ
うに構成され、マグネトロン１の陽極を形成する
陽極筒体２は、その一方の開口端縁に金属製はと
目状の第１封着管３を封着してなり、この封着管
３の先端部に金属製の排気管４が、セラミツクか
らなる絶縁環５を介して突設されている。そし
て、陽極筒体２の内面に設けられた陽極ベイン６
から延び出たマイクロ波導出用導体７の先端部
が、排気管４のピンチオフ部に挟持されており、
排気管４に嵌着された金属製帽体８がマイクロ波
放出端子となる。また、陽極筒体２の他方の開口
端縁に封着された金属製はと目状の第２封着管９
には、陰極端子導出用ステム１０が封着されてお
り、第１封着管３のフランジ部３ａの外面上に同
軸的に設けられたフエライト製円環状の第１永久
磁石１１は、第２封着管９のフランジ部９ａの外
面上に同軸的に設けられたフエライト製円環状の
第２永久磁石１２および枠状継鉄１３とともに、
マグネトロン励磁用の外気磁気回路を形成してい
る。なお、第１封着管３のフランジ部３ａは第１
磁極片１４を覆つており、図示を省略したが、第
１磁極片１４に向き合う第２磁極片は、第２封着
管９のフランジ部９ａによつて覆われている。2. Description of the Related Art In general, an internal magnet type magnetron device used in a microwave oven or the like is constructed as shown in FIGS. A metal eyelet-shaped first sealed tube 3 is sealed at the end edge, and a metal exhaust pipe 4 protrudes from the tip of the sealed tube 3 through an insulating ring 5 made of ceramic. It is set up. And an anode vane 6 provided on the inner surface of the anode cylinder body 2
The tip of the microwave deriving conductor 7 extending from the exhaust pipe 4 is held between the pinch-off portions of the exhaust pipe 4,
A metal cap body 8 fitted onto the exhaust pipe 4 serves as a microwave emission terminal. In addition, a second metal eyelet-shaped sealed tube 9 is sealed to the other opening edge of the anode cylinder 2.
A cathode terminal lead-out stem 10 is sealed to the ferrite annular first permanent magnet 11 coaxially provided on the outer surface of the flange portion 3a of the first sealed tube 3. Together with a second annular permanent magnet 12 made of ferrite coaxially provided on the outer surface of the flange portion 9a of the sealed tube 9 and a frame-shaped yoke 13,
It forms an outside air magnetic circuit for magnetron excitation. Note that the flange portion 3a of the first sealed tube 3 is
Although not shown, the second magnetic pole piece facing the first magnetic pole piece 14 is covered by the flange portion 9a of the second sealed tube 9.
枠状継鉄１３は、断面冂状の第１継鉄部分１５
と、これにねじ１６を用いて結合された断面凵状
の第２継鉄部分１７とからなる断面ロ字状のもの
であり、第１継鉄部分１５の頂面に穿設された穴
１５ａ内に嵌め込まれた円環状のガスケツト１８
は金属細線の編組体からなる。また、第２継鉄部
分１７の底面にとりつけられた金属製のシールド
ケース１９は、第２継鉄部分１７の底面に穿設さ
れた穴１７ａを貫通する第２封着管９の外周面に
接するエツジ付きの穴を有し、ステム１０および
その端子ピンに接続された図外のLCフイルタ回
路用チヨークコイル等を収容している。 The frame-shaped yoke 13 has a first yoke portion 15 having an inverted cross-section.
and a second yoke portion 17 having a cross-section shape that is connected to the second yoke portion 17 using screws 16. An annular gasket 18 fitted inside
consists of a braided body of thin metal wires. Further, a metal shield case 19 attached to the bottom surface of the second yoke portion 17 is attached to the outer circumferential surface of the second sealed tube 9 passing through a hole 17a drilled in the bottom surface of the second yoke portion 17. It has a hole with an edge in contact with the stem 10 and accommodates an LC filter circuit coil (not shown) connected to the stem 10 and its terminal pin.
陽極筒体２等が装置の作動時に温度上昇する
と、フエライトからなる第１・第２永久磁石１
１，１２が高温となり、非可逆的な減磁を起こす
ことがある。そこで、陽極筒体２の外周面に多数
の放熱フイン２０を多段にとりつける一方、第
１・第２封着管３，９の各フランジ部３ａ，９ａ
に小突起３ｂ，９ｂを突出させて、ここに断熱用
の小空隙２１，２２を生じさせている。 When the temperature of the anode cylinder 2 rises during operation of the device, the first and second permanent magnets 1 made of ferrite
1 and 12 may reach high temperatures, causing irreversible demagnetization. Therefore, a large number of heat dissipating fins 20 are attached to the outer peripheral surface of the anode cylinder 2 in multiple stages, and each flange portion 3a, 9a of the first and second sealed tubes 3, 9 is
Small protrusions 3b and 9b are made to protrude to create small gaps 21 and 22 for heat insulation.
発明が解決しようとする問題点
このように構成された従来のマグネトロン装置
においては、永久磁石のいわゆる高温減磁を防止
しうるのであるが、この永久磁石はバリウムフエ
ライトやストロンチウムフエライト等の粉末をプ
レス成型して焼結することにより得たものである
から、応力歪みを受けたり急激な温度変化を受け
たりすると容易に破損する。ところが、永久磁石
１１，１２は第１・第２継鉄部分１５，１７によ
つて軸方向に約20〜30Kgの圧力で締め付けられて
いるので、小突起３ｂ，９ｂに接する部分を中心
にしてなりの応力歪みを受ける。そのうえ、第１
継鉄部分１５の穴１５ａをプレスにより打ち抜い
たときに生じるバリ、すなわち返り２３が第１永
久磁石１１に接するときは、とくに急激な温度変
化を受けることにより、永久磁石に破損を生じや
すくなる。Problems to be Solved by the Invention In the conventional magnetron device configured as described above, it is possible to prevent so-called high-temperature demagnetization of the permanent magnet. Since it is obtained by molding and sintering, it easily breaks when subjected to stress strain or sudden temperature changes. However, since the permanent magnets 11 and 12 are tightened in the axial direction by the first and second yoke parts 15 and 17 with a pressure of about 20 to 30 kg, It is subjected to a certain amount of stress and strain. Moreover, the first
When the burr produced when the hole 15a of the yoke part 15 is punched out by pressing, that is, the burr 23 comes into contact with the first permanent magnet 11, the permanent magnet is particularly susceptible to damage due to rapid temperature changes.
問題点を解決するための手段
本発明は、前述のような問題点を解決すべくな
されたもので、本発明によると、はと目状封着管
のフランジ部またはその上に設けられるシム板に
形成される複数個の小突起を、前記フランジ部の
外周に沿う円周上に散接する一方、前記小突起に
接して前記フランジ部上に同軸的に重ねられるフ
エライト製円環状の永久磁石を陽極筒体側へ押圧
する継鉄部分の穴、すなわち、前記封着管の筒状
部を挿通させる穴の直径を、前記円周の直径にほ
ぼ合致せしめる。Means for Solving the Problems The present invention has been made to solve the above-mentioned problems. A plurality of small protrusions formed on the flange are scattered on a circumference along the outer periphery of the flange, while a circular permanent magnet made of ferrite is coaxially stacked on the flange in contact with the small protrusions. The diameter of the hole in the yoke portion that presses toward the anode cylinder, that is, the hole through which the cylindrical portion of the sealed tube is inserted, is made to approximately match the diameter of the circumference.
作 用
このように構成すると、前記穴の周縁に生じた
返りと前記小突起とによつて永久磁石が軸方向に
締め付けられても、上下からの押圧力は、軸方向
において互いにずれることがなくなり、ここにず
れを生じることによる捩れの応力歪みを解消させ
得、永久磁石の前述のような破損を防止すること
ができる。Effect With this configuration, even if the permanent magnet is tightened in the axial direction by the curvature generated on the periphery of the hole and the small protrusion, the pressing forces from above and below will not deviate from each other in the axial direction. , it is possible to eliminate the torsional stress strain caused by misalignment, and it is possible to prevent the above-mentioned damage to the permanent magnet.
実施例
つぎに、本発明を図面に示した実施例とともに
詳しく説明する。Embodiments Next, the present invention will be explained in detail together with embodiments shown in the drawings.
第１図およびそのＡ−Ａ断面を示す第２図の構
成が、第４図および第５図に示した従来の構成と
基本的に異なるところは、第１継鉄部分１５の頂
面に穿設された穴１５ａが、第１永久磁石１１側
へ突出した打ち抜き返り２３を有するとともに、
その直径D1が、第１封着管３のフランジ部３ａ
に散設された複数個のいぼ状小突起３ｂの配列円
周２４の直径D2にほぼ合致した値に設定されて
いる点と、穴１５ａの直径D1が、永久磁石１１
の内径D3よりも２〜10mm大きく設定されている
点とである。 The structure shown in FIG. 1 and FIG. 2 showing the A-A cross section thereof is fundamentally different from the conventional structure shown in FIGS. 4 and 5. The provided hole 15a has a punched back 23 protruding toward the first permanent magnet 11 side, and
The diameter D1 is the flange portion 3a of the first sealed tube 3.
The diameter D 1 of the hole 15a is set to a value that almost matches the diameter D 2 of the arrangement circumference 24 of the plurality of wart-like small protrusions 3b scattered in the permanent magnet 11.
The inner diameter D3 is set 2 to 10 mm larger than the inner diameter D3.
このように構成すると、返り２３と小突起３ｂ
とが相対向し、これらによつて締め付けられる第
１永久磁石１１に捩れの応力歪みは生じず、永久
磁石の前記応力歪みによる破損を防止することが
できる。また、穴１５ａが径小となることから、
磁気回路抵抗を減少させうるほか、永久磁石の小
型化が可能となる。 With this configuration, the barb 23 and the small protrusion 3b
The first permanent magnet 11 faces each other and is tightened by them, so that no torsional stress distortion occurs in the first permanent magnet 11, and damage to the permanent magnet due to the stress distortion can be prevented. In addition, since the hole 15a has a small diameter,
In addition to reducing the magnetic circuit resistance, it is also possible to downsize the permanent magnet.
第３図はD1−D3の寸度と、マグネトロン中心
磁界の磁束密度との関係を示した実験データであ
り、D1−D3の寸度を２〜10mmの範囲に設定した
場合の同磁束密度が、他に比してすぐれているこ
とが分かる。 Figure 3 shows experimental data showing the relationship between the dimensions of D 1 - D 3 and the magnetic flux density of the magnetron's central magnetic field. It can be seen that the magnetic flux density is superior to others.
なお、以上は第１封着管３と第１継鉄部分１５
と第１永久磁石１１との関係について述べたが、
第２封着管９と第２継鉄部分１７と第２永久磁石
１２との関係についても、前述と同様に設定でき
るのは勿論である。また、小突起をフランジ部に
設けず、フランジ部上に重ねたシム板に設ける形
式のものにも同様に適用できる。 Note that the above describes the first sealed tube 3 and the first yoke portion 15.
Although the relationship between and the first permanent magnet 11 has been described,
Of course, the relationship between the second sealed tube 9, the second yoke portion 17, and the second permanent magnet 12 can also be set in the same manner as described above. Further, the present invention can be similarly applied to a type in which the small protrusions are not provided on the flange portion, but are provided on a shim plate stacked on the flange portion.
発明の効果
以上のように、本発明によると、枠状継鉄を形
成する継鉄部分に穿設する穴の大きさを、小突起
配列円周の直径にほぼ合致させるだけで、永久磁
石の応力歪みによる破損を防止でき、しかも、磁
気回路抵抗の減少および永久磁石の径小化を可能
ならしめうる。Effects of the Invention As described above, according to the present invention, by simply making the size of the hole drilled in the yoke part forming the frame-shaped yoke approximately match the diameter of the small protrusion array circumference, the permanent magnet Damage due to stress and strain can be prevented, and moreover, it is possible to reduce the magnetic circuit resistance and the diameter of the permanent magnet.
第１図は本発明を実施したマグネトロン装置の
要部の側断面図、第２図は第１図のＡ−Ａ断面
図、第３図は同装置のD1−D3寸度と中心磁束密
度との関係を示す実測特性図、第４図および第５
図は従来のマグネトロン装置の一部破断側面図お
よび要部拡大断面図である。
２……陽極筒体、３……封着管、３ａ……小突
起、１１……永久磁石、１４……磁極片、１５…
…継鉄部分、１５ａ……穴。
Figure 1 is a side sectional view of the main parts of a magnetron device embodying the present invention, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is the D 1 - D 3 dimension and central magnetic flux of the same device. Actual measurement characteristic diagrams showing the relationship with density, Figures 4 and 5
The figures are a partially cutaway side view and an enlarged cross-sectional view of essential parts of a conventional magnetron device. 2... Anode cylinder body, 3... Sealed tube, 3a... Small projection, 11... Permanent magnet, 14... Magnetic pole piece, 15...
...Yoke part, 15a...hole.
Claims (1)
されたはと目状封着管のフランジ部またはその上
に設けられたシム板が、前記フランジ部の外周に
沿う円周上に散設された複数個の小突起を有し、
前記フランジ部の外端面上に前記小突起に接して
同軸的に重ねられたフエライト製円環状の永久磁
石が、前記封着管の筒状部を挿通させる穴付きの
継鉄部分により前記陽極筒体側へ押圧されてなる
マグネトロン装置において、前記穴は前記永久磁
石側へ突出した返りを周縁に有して前記円周の直
径にほぼ合致した直径を有していることを特徴と
するマグネトロン装置。 ２ 前記穴が前記永久磁石の内径よりも２〜10mm
大きい直径を有していることを特徴とする特許請
求の範囲第１項に記載のマグネトロン装置。[Claims] 1. A flange portion of the eyelet-shaped sealed tube sealed to at least one opening edge of the anode cylinder or a shim plate provided on the shim plate extends along the outer periphery of the flange portion. It has multiple small protrusions scattered around the circumference,
A circular permanent magnet made of ferrite coaxially stacked on the outer end surface of the flange portion in contact with the small protrusion is attached to the anode tube by a yoke portion with a hole through which the cylindrical portion of the sealed tube is inserted. A magnetron device that is pressed toward a body side, wherein the hole has a curvature on its periphery that projects toward the permanent magnet side, and has a diameter that substantially matches the diameter of the circumference. 2 The hole is 2 to 10 mm larger than the inner diameter of the permanent magnet.
2. Magnetron device according to claim 1, characterized in that it has a large diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26912186A JPS63124341A (en) | 1986-11-12 | 1986-11-12 | Magnetron device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26912186A JPS63124341A (en) | 1986-11-12 | 1986-11-12 | Magnetron device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63124341A JPS63124341A (en) | 1988-05-27 |
| JPH0578889B2 true JPH0578889B2 (en) | 1993-10-29 |
Family
ID=17467971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26912186A Granted JPS63124341A (en) | 1986-11-12 | 1986-11-12 | Magnetron device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63124341A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4969084B2 (en) * | 2005-11-07 | 2012-07-04 | 東芝ホクト電子株式会社 | Magnetron for microwave oven |
-
1986
- 1986-11-12 JP JP26912186A patent/JPS63124341A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63124341A (en) | 1988-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |