CN103531419B - A kind of microwave heating magnetron tube core - Google Patents
A kind of microwave heating magnetron tube core Download PDFInfo
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- CN103531419B CN103531419B CN201310511985.XA CN201310511985A CN103531419B CN 103531419 B CN103531419 B CN 103531419B CN 201310511985 A CN201310511985 A CN 201310511985A CN 103531419 B CN103531419 B CN 103531419B
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- power supply
- connecting rod
- supply connecting
- electrode power
- nickel cobalt
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Abstract
This invention belongs to the microwave heating magnetron tube core in design of magnetron and production field.Comprise hot cathode emitter and upper shielding cap thereof and lower shielding cap, bimetallic center that expansion ceramic sealing alloy is welded supports and top electrode power supply connecting rod to adopt metal molybdenum and iron nickel cobalt to determine, adopt iron nickel cobalt to determine expansion ceramic sealing alloy limit to support and bottom electrode power supply connecting rod, lower magnetic pole, die case, is provided with the hole higfh-tension ceramics that is tightly connected.This invention to support as limit and the lower semisection of bottom electrode power supply connecting rod and central supported and top electrode power supply connecting rod owing to adopting coefficient of linear expansion and resistivity extremely close with higfh-tension ceramics to determine expansion ceramic sealing alloy far below the iron nickel cobalt of metal molybdenum, thus there is the hermetically-sealed construction of magnetron tube core and welding procedure simple, sealing is excellent, reliability during work is high, long service life, the rate of finished products in production is high, cost is lower, the electrical property of negative electrode obtains the features such as improvement to a certain degree.
Description
Technical field
The invention belongs to design and the production technical field of magnetron, relate to a kind of design and production of microwave heating magnetron tube core structure in particular, adopt this magnetron tube core can extend its useful life, production technology can be simplified simultaneously, reduce production cost; The magnetron of this tube core is adopted especially to be suitable as microwave high-temperature industrial kiln microwave heating magnetron.
Background technology
In normal traditional microwave heating magnetron tube core, adopt hot cathode as electron emission source, operationally need electric current supply hot cathode, the temperature of negative electrode is elevated to 1200 DEG C to 2500 DEG C.Because magnetron belongs to electron tube, must work under vacuum degree good environment, the sealing property that therefore magnetron tube core is good is the key factor ensureing magnetron performance and used life.
Accompanying drawing 1 is the structural representation of microwave heating magnetron and the tube core thereof generally adopted on high-temperature industrial furnace at present, and wherein bold portion is tube core structure schematic diagram, double dot dash line part is magnetron remainder structural representation.In figure: hot cathode emitter 1-1 is the crepe cord body that after adopting carbonization, the tungsten wire rod of thoriated turns to, and helicoid two ends are fixed respectively by upper shielding cap 1-2 and lower shielding cap 1-3; Upper end, simultaneously the Kong Houyu center-side leader 1-9 that is tightly connected passed in higfh-tension ceramics 1-8 that upper shielding cap 1-2 is fixed on central supported and top electrode power supply connecting rod 1-4 connect to access high voltage source; Upper end, simultaneously the Kong Houyu limit end leader 1-10 that is tightly connected passed in higfh-tension ceramics 1-8 that lower shielding cap 1-3 is fixed on limit support and bottom electrode power supply connecting rod 1-5 connect to access high voltage source.In order to ensure the vacuum degree of magnetron, need center-side leader 1-9 and limit end leader 1-10 to carry out good soldering with the metallization on higfh-tension ceramics 1-8 end face and nickel coating 1-11 respectively, to guarantee magnetron sealing and vacuum degree; Whole tube core by lower magnetic pole 1-6 and lower shell (i.e. die case) 1-7 and anode of magnetron cylinder 2-1 fit sealing integral, i.e. composition microwave heating magnetron.
Owing to needing to provide certain electric current to filament when magnetron works, central supported and top electrode power supply connecting rod 1-4 and limit support and bottom electrode power supply connecting rod 1-5 needs to add the high pressure of about 4kV have the pressure reduction (being about 3.3V) that one little between two poles simultaneously.Central supported and top electrode power supply connecting rod 1-4 must be connected with upper shielding cap 1-2 through emitter 1-1 center as the power supply connecting rod of emitter 1-1 top electrode; According to the operation principle of magnetron, the effect in magnetic field is subject to from the electronics of cathode emission, some electron back bombardment to cathode emitter 1-1 will get to the top of central supported and top electrode power supply connecting rod 1-4, the temperatures as high about 1800 DEG C at this position when its this body of rod is worked through the gap on its crepe cord body.Therefore, in order to make magnetron working stability, reliable, this central supported and top electrode power supply connecting rod 1-4 generally adopt its fusing point up to the metal molybdenum of 2620 DEG C of points, but metal molybdenum is 4.9 ~ 5.2 × 10 at 20 ~ 100 DEG C of interval averages coefficient of linear expansion
-6/ DEG C; And higfh-tension ceramics 1-8(is generally containing Al
2o
395 porcelain of 95%) be 6.5 ~ 7.5 × 10 at 20 ~ 500 DEG C of interval averages coefficient of linear expansion
-6/ DEG C.When magnetron operating state is good, the temperature of its higfh-tension ceramics 1-8 is generally about about 120 DEG C, because the expansion coefficient difference of higfh-tension ceramics 1-8 and metal molybdenum is larger, in the course of the work higfh-tension ceramics 1-8 can produce certain stress, particularly when discontinuous because repeatedly standing the impact of strangulated stress, the sealing of this stress to the brazed portion of the metallized ends leader of higfh-tension ceramics and metal molybdenum and higfh-tension ceramics brings adverse effect, affects its sealing and useful life.This situation seems outstanding especially (under this environment, the temperature of magnetron middle-high-pressure ceramic 1-8 part is sometimes up to about 300 DEG C) in the microwave high-temperature kiln adopting magnetron heating, and magnetron more easily damages; In addition, metal molybdenum rod is adopted to support and bottom electrode power supply connecting rod as central supported and top electrode power supply connecting rod and limit completely, also there is resistivity (resistivity of technical pure polycrystalline molybdenum is 570 μ Ω m) and cost is higher and between higfh-tension ceramics hermetically-sealed construction and welding procedure complicated, produce in rate of finished products lower, the electrical property of negative electrode is the disadvantage such as poor also.
Summary of the invention
The object of the present invention is to provide a kind of microwave heating magnetron tube core, simplify the central supported of magnetron tube core and top electrode power supply connecting rod and limit support and between bottom electrode power supply connecting rod and higfh-tension ceramics hermetically-sealed construction and welding procedure basis on, reduce the quantity of seal, reach the reliability when sealing of effectively raising magnetron tube core, work, extend its useful life, improve the rate of finished products in producing, reduce production cost, improve the objects such as the electrical property of negative electrode.
Solution of the present invention is that the molten point of employing is 1450 DEG C, in the temperature range of-20 DEG C ~ 500 DEG C, average coefficient of linear expansion is 6.6 ~ 7.4 × 10
-6/ DEG C iron nickel cobalt determine expansion ceramic sealing alloy and support and bottom electrode power supply connecting rod 1-5 as limit, its coefficient of expansion and higfh-tension ceramics are (as contained Al
2o
395 porcelain of 95%) average coefficient of linear expansion 6.5 ~ 7.5 × 10
-6/ DEG C extremely close, and central supported and top electrode power supply connecting rod 1-4 are divided into two parts, wherein: the upper semisection 1-4.1 be connected with upper shielding cap 1-2 through the center of emitter 1-1 still adopts metal molybdenum, to guarantee its heat-resisting quantity, when working for magnetron simultaneously, the temperature of lower shielding cap 3 is between 800-1000 DEG C, be positioned at the temperature of the lower semisection 1-4.2 of lower shielding cap less than 3 lower than 800 DEG C, thus iron nickel cobalt is adopted surely to expand ceramic sealing alloy, on, weld between lower two sections, thus both guaranteed the heat-resisting quantity of upper semisection 1-4.1, effectively can improve again the hermetically-sealed construction between bottom and higfh-tension ceramics, the reliability of sealing, and extend the useful life of magnetron, namely the present invention realizes its goal of the invention with this.Thus, microwave heating magnetron tube core of the present invention comprises hot cathode emitter and upper shielding cap thereof and lower shielding cap, central supported and top electrode power supply connecting rod, limit supports and bottom electrode power supply connecting rod, lower magnetic pole, die case, be provided with the hole higfh-tension ceramics that is tightly connected, key is that limit supports and bottom electrode power supply connecting rod is that iron nickel cobalt expands ceramic sealing alloy surely, and central supported and top electrode power supply connecting rod are then the upper semisection bimetallic lever be welded that adopts metal molybdenum, lower semisection employing iron nickel cobalt to determine expansion ceramic sealing alloy; Limit support and the upper end of bottom electrode power supply connecting rod, central supported and top electrode power supply connecting rod corresponding integrally welded with lower shielding cap, upper shielding cap respectively, the bottom of two bodies of rod be then tightly connected with higfh-tension ceramics respectively Kong Zhongjing metallize and the corresponding seal welding of connecting portion after Nickel Plating Treatment integral.
It is that average coefficient of linear expansion is 6.6 ~ 7.4 × 10 in the temperature range of-20 DEG C ~ 500 DEG C that above-mentioned iron nickel cobalt determines expansion ceramic sealing alloy
-6/ DEG C, resistivity 4J33 or the 4J34 iron nickel cobalt that is respectively 0.46 μ Ω m and 0.45 μ Ω m expands ceramic sealing alloy surely.
The present invention is owing to adopting average coefficient of linear expansion in the temperature range of-20 DEG C ~ 500 DEG C to be 6.6 ~ 7.4 × 10
-6/ DEG C, the resistivity iron nickel cobalt that is respectively 0.46 μ Ω m and 0.45 μ Ω m determines expansion ceramic sealing alloy 4J33,4J34 does limit in magnetron tube core and supports and the lower semisection of bottom electrode power supply connecting rod and central supported and top electrode power supply connecting rod, not only simplify the hermetically-sealed construction between two bodies of rod and higfh-tension ceramics and sealing technology, effectively improve the sealing of magnetron tube core and the rate of finished products of production, and reduce production cost to a certain extent, improve the electrical property of negative electrode; The cost adopting iron nickel cobalt to determine expansion ceramic sealing alloy material less than the half of metal molybdenum and its resistivity also far below 570 μ Ω m of technical pure polycrystalline molybdenum resistivity.Thus, the present invention has the hermetically-sealed construction of magnetron tube core and welding procedure is simple, and sealing is excellent, and reliability during work is high, long service life, and the rate of finished products in producing is high, cost is lower, the electrical property of negative electrode obtains the features such as improvement to a certain degree.
Accompanying drawing explanation
Fig. 1 is background technology microwave heating magnetron structures and tube core relative position schematic diagram (cutaway view) in magnetron, and wherein bold portion is tube core structure schematic diagram, double dot dash line part is magnetron remainder structural representation;
Fig. 2 is microwave heating magnetron structures of the present invention and tube core relative position schematic diagram (cutaway view) in magnetron, and wherein bold portion is tube core structure schematic diagram of the present invention, double dot dash line part is magnetron remainder structural representation.
In figure: 1. tube core, 1-1. hot cathode emitter, the upper shielding cap of 1-2., shielding cap under 1-3., 1-4. central supported and top electrode power supply connecting rod, 1-4.1.(central supported and top electrode power supply connecting rod) upper semisection, 1-4.2.(central supported and top electrode power supply connecting rod) lower semisection, 1-5. limit supports and bottom electrode power supply connecting rod, 1-6. lower magnetic pole, shell (i.e. die case) under 1-7., 1-8. higfh-tension ceramics, 1-9. center-side leader, 1-10. limit end leader, 1-11. metallization and nickel coating; 2. double dot dash line part: 2-1. anode canister, 2-2. blade, 2-3. antenna, 2-4. output ceramic cylinder, 2-5. exhaust header pipe, the upper magnetic pole of 2-6., the upper shell of 2-7..
Embodiment
Present embodiment is for the microwave heating magnetron of operating voltage 4.2kV, power output 900W-1200W, wherein: hot cathode emitter 1-1(voltage 3.3V, electric current 10A), upper shielding cap 1-2(φ 7.2mm, thick 1.0mm), lower shielding cap 1-3(external diameter φ outer 7.2mm, internal diameter φ 2.5mm,, thick 2.5mm), and lower magnetic pole 1-6, lower shell (i.e. die case) 1-7; Anode canister 2-1, blade 2-2, antenna 2-3, output ceramic cylinder 2-4, exhaust header pipe 2-5, upper magnetic pole 2-6, upper its structure of shell 2-7 and size are all identical with background technology same model (specification) microwave heating magnetron; Its material of the present embodiment higfh-tension ceramics 1-8 is (still for containing Al
2o
395 porcelain of 95%), external diameter and Gao Yijun identical with background technology, but do not metallize and Nickel Plating Treatment in outer face, only respectively to support with limit and bottom electrode power supply connecting rod 1-5, central supported and top electrode power supply connecting rod lower semisection 1-4.2 coordinate that two surfaces, welding position being tightly connected hole metallize and after Nickel Plating Treatment, then support with limit respectively and bottom electrode power supply connecting rod 1-5 and central supported and top electrode power supply connecting rod lower semisection 1-4.2 seal welding integral; In higfh-tension ceramics 1-8 two be tightly connected hole, limit support and bottom electrode power supply connecting rod 1-5, central supported and top electrode power supply connecting rod 1-4(comprise 1-4.2) nominal diameter be φ 1.5mm; Limit supports and the long 41.5mm of bottom electrode power supply connecting rod 1-5, the long 25mm of upper semisection 1-4.1 of central supported and top electrode power supply connecting rod 1-4, the long 29.5mm of lower semisection 1-4.2, and material all adopts the trade mark to be that the iron nickel cobalt of 4J33 expands ceramic sealing alloy surely.
Claims (2)
1. a microwave heating magnetron tube core, comprise hot cathode emitter and upper shielding cap thereof and lower shielding cap, central supported and top electrode power supply connecting rod, limit supports and bottom electrode power supply connecting rod, lower magnetic pole, die case, be provided with the hole higfh-tension ceramics that is tightly connected, it is characterized in that limit supports and bottom electrode power supply connecting rod is that iron nickel cobalt expands ceramic sealing alloy surely, central supported and top electrode power supply connecting rod are then the upper semisection bimetallic lever be welded that adopts metal molybdenum, lower semisection employing iron nickel cobalt to determine expansion ceramic sealing alloy; Limit support and the upper end of bottom electrode power supply connecting rod, central supported and top electrode power supply connecting rod corresponding integrally welded with lower shielding cap, upper shielding cap respectively, the bottom of two bodies of rod be then tightly connected with higfh-tension ceramics respectively Kong Zhongjing metallize and the corresponding seal welding of connecting portion after Nickel Plating Treatment integral;
Described higfh-tension ceramics is average coefficient of linear expansion 6.5 ~ 7.5 × 10 in the temperature range of-20 DEG C ~ 500 DEG C
-6/ DEG C higfh-tension ceramics;
And described iron nickel cobalt is determined expansion ceramic sealing alloy and is average coefficient of linear expansion 6.6 ~ 7.4 × 10 in the temperature range of-20 DEG C ~ 500 DEG C
-6/ DEG C iron nickel cobalt surely to expand ceramic sealing alloy.
2. by microwave heating magnetron tube core described in claim 1, wherein said in the temperature range of-20 DEG C ~ 500 DEG C average coefficient of linear expansion be 6.6 ~ 7.4 × 10
-6/ DEG C iron nickel cobalt expands ceramic sealing alloy surely, it is characterized in that described iron nickel cobalt is determined expansion ceramic sealing alloy and is 4J33 or 4J34 iron nickel cobalt that resistivity is respectively 0.46 μ Ω m and 0.45 μ Ω m and surely expands ceramic sealing alloy.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310511985.XA CN103531419B (en) | 2013-10-25 | 2013-10-25 | A kind of microwave heating magnetron tube core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310511985.XA CN103531419B (en) | 2013-10-25 | 2013-10-25 | A kind of microwave heating magnetron tube core |
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| Publication Number | Publication Date |
|---|---|
| CN103531419A CN103531419A (en) | 2014-01-22 |
| CN103531419B true CN103531419B (en) | 2016-02-10 |
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|---|---|---|---|
| CN201310511985.XA Expired - Fee Related CN103531419B (en) | 2013-10-25 | 2013-10-25 | A kind of microwave heating magnetron tube core |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810536B (en) * | 2016-03-31 | 2018-01-12 | 电子科技大学 | Using the magnetron of combined type cold cathode head and the production method of cold cathode body |
| CN109860007A (en) * | 2019-02-01 | 2019-06-07 | 武汉美味源生物工程有限公司 | Magnetron and insulating treatment method and its application under vacuum state |
| CN113909665B (en) * | 2021-10-22 | 2023-03-17 | 哈尔滨工业大学 | Method for diffusion welding of Kovar alloy with molybdenum-rhenium alloy and intermediate layer |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57831A (en) * | 1980-06-02 | 1982-01-05 | Hitachi Ltd | Magnetron |
| EP0187033B1 (en) * | 1984-12-28 | 1992-11-11 | Kabushiki Kaisha Toshiba | Magnetron with a ceramic stem having a cathode support structure |
| JP2004193104A (en) * | 2002-12-10 | 2004-07-08 | Samsung Electronics Co Ltd | Magnetron, microwave oven, and high frequency heating device |
| CN1577701A (en) * | 2003-07-30 | 2005-02-09 | 东芝北斗电子株式会社 | Magnetron for microwave oven |
| CN203536357U (en) * | 2013-10-25 | 2014-04-09 | 电子科技大学 | Magnetron tube core for microwave heating |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002343263A (en) * | 2001-05-22 | 2002-11-29 | Sanyo Electric Co Ltd | Magnetron |
-
2013
- 2013-10-25 CN CN201310511985.XA patent/CN103531419B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57831A (en) * | 1980-06-02 | 1982-01-05 | Hitachi Ltd | Magnetron |
| EP0187033B1 (en) * | 1984-12-28 | 1992-11-11 | Kabushiki Kaisha Toshiba | Magnetron with a ceramic stem having a cathode support structure |
| JP2004193104A (en) * | 2002-12-10 | 2004-07-08 | Samsung Electronics Co Ltd | Magnetron, microwave oven, and high frequency heating device |
| CN1577701A (en) * | 2003-07-30 | 2005-02-09 | 东芝北斗电子株式会社 | Magnetron for microwave oven |
| CN203536357U (en) * | 2013-10-25 | 2014-04-09 | 电子科技大学 | Magnetron tube core for microwave heating |
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| CN103531419A (en) | 2014-01-22 |
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