EP3651179A1 - Magnetron und damit ausgestattete mikrowellenheizvorrichtung - Google Patents

Magnetron und damit ausgestattete mikrowellenheizvorrichtung Download PDF

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Publication number
EP3651179A1
EP3651179A1 EP18828642.1A EP18828642A EP3651179A1 EP 3651179 A1 EP3651179 A1 EP 3651179A1 EP 18828642 A EP18828642 A EP 18828642A EP 3651179 A1 EP3651179 A1 EP 3651179A1
Authority
EP
European Patent Office
Prior art keywords
yoke
magnetron
claw
frame
exemplary embodiment
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
Application number
EP18828642.1A
Other languages
English (en)
French (fr)
Other versions
EP3651179A4 (de
Inventor
Takeshi Ishii
Katsuhiko KANEDA
Yuuichi Mizuno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Publication of EP3651179A1 publication Critical patent/EP3651179A1/de
Publication of EP3651179A4 publication Critical patent/EP3651179A4/de
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/10—Magnet systems for directing or deflecting the discharge along a desired path, e.g. a spiral path
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/12—Vessels; Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/50—Magnetrons, i.e. tubes with a magnet system producing an H-field crossing the E-field
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H01F2003/103—Magnetic circuits with permanent magnets

Definitions

  • the present disclosure relates to a magnetron that is difficult to disassemble and a microwave heating device including the magnetron.
  • a conventional magnetron that is a microwave generator is structurally broken down from a functional aspect into a magnetic circuit section, a cooling circuit section, an LC filter circuit section, and a core tube.
  • the core tube includes a top shell part with an antenna part and also includes an anode part and a cathode part.
  • the magnetron is an electron tube that generates microwaves by converting direct current energy applied between the anode part and the cathode part to high-frequency energy by means of electron motion in an interaction space between the anode part and the cathode part where orthogonal static electromagnetic fields are created.
  • the magnetron is widely used as the microwave generator for a microwave heating device such as a microwave oven because of its relatively high oscillation efficiency and ease of increased output (refer to, for example, PTL 1).
  • FIG. 6 is a perspective view of the conventional magnetron.
  • FIG. 7 is a sectional view of the core tube of the conventional magnetron.
  • FIG. 8 illustrates in section exterior components of the conventional magnetron, apart from the core tube.
  • core tube 19 of the typical magnetron is formed by a vacuum sealing.
  • Coiled filament 1 is disposed in a center of the cathode part of the magnetron.
  • Filament 1 is supported by center lead 4 and side lead 5.
  • Center lead 4 is connected to side lead 5 via end hat 2 and end hat 3 that are provided respectively at both ends of filament 1.
  • the anode part of the magnetron includes anode cylinder 6 and an even number of vanes 7 projecting from an inner peripheral surface of anode cylinder 6 toward filament 1. Vanes 7 are provided to keep a predetermined distance from filament 1. Cavity resonators 8 are defined by vanes 7 and the inner peripheral wall surface of anode cylinder 6.
  • a pair of mortar-shaped magnetic pole parts 9 and 10 of substantially identical shape are disposed respectively at axial ends of anode cylinder 6 to face each other.
  • Input unit 12 is provided outwardly of an axial end of magnetic pole part 9 and supplies to filament 1 heating power and a high voltage that drives the magnetron.
  • Output unit 11 is provided outwardly of an axial end of magnetic pole part 10 and radiates microwaves generated in the anode part.
  • Core tube 19 is covered with respective vacuum walls of output unit 11 and input unit 12.
  • a pair of annular permanent magnets 13 and 14 have their respective pole faces magnetically coupled to magnetic pole parts 9 and 10, respectively.
  • the pair of annular permanent magnets 13 and 14 have their respective opposite pole faces magnetically coupled to frame-shaped yokes 15 and 16, respectively.
  • Frame-shaped yokes 15 and 16 are made of a ferromagnetic material and are combined together to have a quadrangular profile.
  • heating filament 1 and applying a predetermined high direct-current voltage between filament 1 and vanes 7 cause emission of electrons from filament 1 toward vanes 7.
  • the electrons are affected by the orthogonal electromagnetic fields in electron motion space 17 between filament 1 and vanes 7.
  • the electrons head toward vanes 7 while circling filament 1.
  • the electrons interact with weak 2,450 MHz-band microwaves generated in cavity resonators 8 divided by vanes 7, whereby large microwaves are generated in cavity resonators 8.
  • the microwaves thus generated in cavity resonators 8 are transmitted by antenna lead 18 electrically coupled to one of vanes 7 and are radiated into a heating chamber of the microwave oven through output unit 11.
  • the components other than core tube 19 can be used semipermanently. Disassembly of the magnetron and replacement of core tube 19 can be done by simple work such as removal of screws 21. Therefore, the magnetron may be used in a manner that is not guaranteed by a manufacturer, such as using a non-genuine replacement for the component. This causes unstable operation and leads to a shortened life.
  • An object of the present disclosure is to provide a highly reliable magnetron that cannot be disassembled unless the components are destroyed.
  • a magnetron according to one aspect of the present disclosure comprises a magnetic circuit that includes permanent magnets and a yoke.
  • the yoke includes a first yoke and a second yoke that are joined together.
  • the first yoke and the second yoke of the magnetron according to this aspect are joined together by plastic deformation of a joint part provided integrally with at least one of the first yoke or the second yoke.
  • This aspect can prevent the magnetron from being used in a manner that is not guaranteed by a manufacturer, such as using a non-genuine replacement for a component.
  • unstable operation can be suppressed, and a shortened life can be prevented.
  • the magnetron that can be provided consequently cannot be disassembled unless the components are destroyed and thus is highly reliable.
  • a magnetron according to a first aspect of the present disclosure comprises a magnetic circuit that includes permanent magnets and a yoke.
  • the yoke includes a first yoke and a second yoke that are joined together.
  • the first yoke and the second yoke of the magnetron according to this aspect are joined together by plastic deformation of a joint part provided integrally with at least one of the first yoke or the second yoke.
  • a magnetron according to a second aspect of the present disclosure is such that the first yoke and the second yoke are joined together by swaging.
  • a magnetron according to a third aspect of the present disclosure is such that the first yoke includes a claw serving as the joint part.
  • the second yoke includes a hole. The claw is bent by swaging to engage the hole.
  • a magnetron according to a fourth aspect of the present disclosure is such that the first yoke includes a claw serving as the joint part.
  • the claw includes an engagement projection.
  • the second yoke includes a hole and an engagement part provided in the hole. The claw is bent by swaging, and the engagement projection engages with the engagement part.
  • a microwave heating device includes the magnetron according to the first aspect.
  • FIG. 1 is a perspective view of a magnetron according to the first exemplary embodiment of the present disclosure.
  • FIG. 2 illustrates in section exterior components of the magnetron according to the present exemplary embodiment, apart from a core tube.
  • FIG. 3 is an enlarged view of a portion of the magnetron according to the present exemplary embodiment before a claw of an input-side frame-shaped yoke is bent.
  • FIG. 4A is an enlarged view of a portion of the magnetron according to the present exemplary embodiment, as seen from outside, with the claw of the input-side frame-shaped yoke bent.
  • FIG. 4B is an enlarged view of a portion of the magnetron according to the present exemplary embodiment, as seen from inside, with the claw of the input-side frame-shaped yoke bent.
  • frame-shaped yoke 15 is disposed to have a U-shaped profile.
  • Frame-shaped yoke 16 is disposed to have an inverted U-shaped profile.
  • frame-shaped yokes 15 and 16 overlap at their respective ends.
  • a tubular frame-shaped yoke having a quadrangular section is formed.
  • frame-shaped yokes 15 and 16 correspond to the first yoke and the second yoke, respectively.
  • the two ends of frame-shaped yoke 15 are each formed with, substantially at their midpoint, notch 151.
  • Claw 201 is formed integrally with frame-shaped yoke 15 to protrude in each of notches 151.
  • Claw 201 is formed with, at its leading end, hook-shaped engagement projection 202.
  • claw 201 corresponds to the joint part.
  • the two ends of frame-shaped yoke 16 are each formed with, substantially at their respective midpoint, hole 161.
  • Each of provided holes 161 faces claw 201 of frame-shaped yoke 15 as illustrated in FIGS. 4A and 4B .
  • Engagement part 162 is formed in hole 161, so that hole 161 is substantially L-shaped.
  • annular permanent magnet 13 When the magnetron is assembled, annular permanent magnet 13 is placed on a central part of an inner side of frame-shaped yoke 15 to surround a hole formed in frame-shaped yoke 15. An input side of assembled core tube 19 is inserted into annular permanent magnet 13 and frame-shaped yoke 15. An output side of core tube 19 is inserted into annular permanent magnet 14 and frame-shaped yoke 16. Frame-shaped yokes 15 and 16 are riveted together at their overlapping parts, thus forming the tubular frame-shaped yoke having the quadrangular profile.
  • Claw 201 is bent about 90° toward hole 161 by swaging to be engaged to a peripheral edge defined by hole 161.
  • claw 201 of frame-shaped yoke 15 engages hole 161 of frame-shaped yoke 16 to thus fasten frame-shaped yokes 15 and 16 together, the magnetron cannot be disassembled.
  • the bending angle of claw 201 is about 90°. If the bending angle is greater than or equal to 90°, secure engagement is effected between frame-shaped yokes 15 and 16.
  • claw 201 (the joint part) provided integrally with at least one of frame-shaped yoke 15 or frame-shaped yoke 16 undergoes plastic deformation (the swaging) to join frame-shaped yokes 15 and 16 together in the present exemplary embodiment.
  • hook-shaped engagement projection 202 is formed at the leading end of claw 201.
  • Engagement projection 202 is, so to speak, L-shaped.
  • claw 201 may be T-shaped. In that case, two engagement parts 162 have only to be formed in hole 161.
  • frame-shaped yokes 15 and 16 are riveted together at their overlapping parts, thus being fastened together.
  • Frame-shaped yokes 15 and 16 may be fastened together, for example, with tapping screws.
  • the present exemplary embodiment described above can prevent the magnetron from being used in a manner that is not guaranteed by a manufacturer, such as using a non-genuine replacement for the component.
  • unstable operation can be suppressed, and a shortened life can be prevented.
  • the magnetron that can be provided consequently cannot be disassembled unless the components are destroyed and thus is highly reliable.
  • FIG. 5 is an enlarged view illustrating a portion of a yoke of a magnetron according to the present exemplary embodiment.
  • the present exemplary embodiment is similar to the first exemplary embodiment in that claw 203 is bent to engage hole 163. However, the present exemplary embodiment has the following differences from the first exemplary embodiment.
  • claw 203 is not provided with engagement projection 202, and engagement part 162 is not provided in hole 163 in the present exemplary embodiment.
  • claw 203 is preferably bent 90° or more to be anchored.
  • the present exemplary embodiment described above can prevent the magnetron from being used in a manner that is not guaranteed by a manufacturer, such as using a non-genuine replacement for the component.
  • unstable operation can be suppressed, and a shortened life can be prevented.
  • the magnetron that can be provided consequently cannot be disassembled unless the components are destroyed and thus is highly reliable.
  • the present disclosure is applicable to magnetrons.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Microwave Tubes (AREA)
EP18828642.1A 2017-07-06 2018-06-28 Magnetron und damit ausgestattete mikrowellenheizvorrichtung Pending EP3651179A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2017132824 2017-07-06
PCT/JP2018/024536 WO2019009173A1 (ja) 2017-07-06 2018-06-28 マグネトロンとこれを備えたマイクロ波加熱装置

Publications (2)

Publication Number Publication Date
EP3651179A1 true EP3651179A1 (de) 2020-05-13
EP3651179A4 EP3651179A4 (de) 2020-07-15

Family

ID=64950076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18828642.1A Pending EP3651179A4 (de) 2017-07-06 2018-06-28 Magnetron und damit ausgestattete mikrowellenheizvorrichtung

Country Status (4)

Country Link
EP (1) EP3651179A4 (de)
JP (1) JP7008185B2 (de)
CN (1) CN110770873B (de)
WO (1) WO2019009173A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2019406778A1 (en) 2018-12-17 2021-07-22 Massachusetts Institute Of Technology Crispr-associated transposase systems and methods of use thereof

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60156655U (ja) * 1984-03-29 1985-10-18 株式会社東芝 マグネトロン
JPS61110937A (ja) * 1984-11-06 1986-05-29 Matsushita Electronics Corp マグネトロン装置
JPH043382Y2 (de) * 1986-01-16 1992-02-03
JPH03119634A (ja) * 1989-10-02 1991-05-22 Hitachi Ltd マグネトロン
JPH0817079B2 (ja) * 1990-02-15 1996-02-21 松下電子工業株式会社 マグネトロン用継鉄の組立方法および同継鉄の組立用具
JP3238735B2 (ja) 1991-03-04 2001-12-17 川崎製鉄株式会社 マンガン−亜鉛系フェライト
KR940006922Y1 (ko) * 1991-12-14 1994-10-06 주식회사 금성사 마그네트론의 요크 결합장치
KR200165763Y1 (ko) * 1997-02-17 2000-01-15 윤종용 마그네트론의 하부 요오크구조
KR20010011415A (ko) * 1999-07-28 2001-02-15 윤종용 전자렌지용 마그네트론
JP5251004B2 (ja) 2006-05-31 2013-07-31 東レ株式会社 プリフォームの製造方法およびプリフォーム並びに繊維強化プラスチック桁材
JP6180733B2 (ja) 2011-12-22 2017-08-16 ダイワボウホールディングス株式会社 光熱変換性再生セルロース繊維、その製造方法及び繊維構造物

Also Published As

Publication number Publication date
JPWO2019009173A1 (ja) 2020-05-21
CN110770873A (zh) 2020-02-07
WO2019009173A1 (ja) 2019-01-10
EP3651179A4 (de) 2020-07-15
JP7008185B2 (ja) 2022-01-25
CN110770873B (zh) 2022-09-20

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