CN103531419A - Magnetron tube core for microwave heating - Google Patents
Magnetron tube core for microwave heating Download PDFInfo
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- CN103531419A CN103531419A CN201310511985.XA CN201310511985A CN103531419A CN 103531419 A CN103531419 A CN 103531419A CN 201310511985 A CN201310511985 A CN 201310511985A CN 103531419 A CN103531419 A CN 103531419A
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- connecting rod
- supply connecting
- tube core
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Abstract
The invention belongs to the field of magnetron design and production, and discloses a magnetron tube core for microwave heating. The magnetron tube core comprises a heated cathode emitter, an upper shielding cap, a lower shielding cap, a bimetal center support and upper electrode supply connecting rod, a side support and lower electrode supply connecting rod, a lower magnetic pole, a tube core casing and high-tension ceramic, wherein the upper shielding cap and the lower shielding cap are arranged on the heated cathode emitter; the bimetal center support and upper electrode supply connecting rod is welded by molybdenum as well as iron, nickel and cobalt constant-expansion ceramic sealing alloy; the side support and lower electrode supply connecting rod adopts iron, nickel and cobalt constant-expansion ceramic sealing alloy; and the high-tension ceramic is provided with sealing connection holes. According to the magnetron tube core for microwave heating, the iron, nickel and cobalt constant-expansion ceramic sealing alloy is adopted as lower half sections of the side support and lower electrode supply connecting rod and the center support and upper electrode supply connecting rod, a coefficient of linear expansion of the iron, nickel and cobalt constant-expansion ceramic sealing alloy is very similar to that of the high-tension ceramic, and the specific resistance of the iron, nickel and cobalt constant-expansion ceramic sealing alloy is far lower than that of molybdenum, so that the magnetron tube core has the characteristics of simple sealing structure and welding technology, good sealing performance, high reliability during working, long service life, high yield of production, lower cost and the like, and electrical performance of the cathode is improved to some extent.
Description
Technical field
The invention belongs to design and the production technical field of magnetron, relate in particular design and the production of magnetron tube core structure for a kind of microwave heating, adopt this magnetron tube core can extend its useful life, can simplify production technology simultaneously, reduce production costs; Adopt the magnetron of this tube core to be especially suitable as microwave high-temperature industrial kiln microwave heating magnetron.
Background technology
In normal traditional microwave, heat with adopting hot cathode as electron emission source in magnetron tube core, need be by electric current supply hot cathode, to the temperature of negative electrode is elevated to 1200 ℃ to 2500 ℃ when work.Because magnetron belongs to electron tube, must under vacuum degree good environment, work, so the good sealing property of magnetron tube core is the key factor that guarantees magnetron performance and used life.
Accompanying drawing 1 is the structural representation of magnetron and tube core thereof for the current microwave heating generally adopting on high-temperature industrial furnace, and wherein solid line is partly that tube core structure schematic diagram, double dot dash line are partly magnetron remainder structural representation.In figure: hot cathode emitter 1-1 is the crepe cord body that after employing carbonization, the tungsten wire rod of thoriated turns to, and helicoid two ends are fixed by upper shielding cap 1-2 and lower shielding cap 1-3 respectively; Upper shielding cap 1-2 is fixed on the upper end of central supported and top electrode power supply connecting rod 1-4, through the Kong Houyu center-side leader 1-9 that is tightly connected in higfh-tension ceramics 1-8, connects to access high voltage source simultaneously; Lower shielding cap 1-3 is fixed on the upper end of limit support and bottom electrode power supply connecting rod 1-5, the Kong Houyu limit end leader 1-10 that is tightly connected simultaneously passing in higfh-tension ceramics 1-8 connects to access high voltage source.In order to guarantee the vacuum degree of magnetron, need to by center-side leader 1-9 and limit end leader 1-10 respectively with higfh-tension ceramics 1-8 end face on metallization and nickel coating 1-11 carry out good soldering, to guarantee magnetron sealing and vacuum degree; Whole tube core is integral by lower magnetic pole 1-6 and lower shell (being tube core shell) 1-7 and anode of magnetron cylinder 2-1 fit sealing, forms microwave heating magnetron.
While working due to magnetron, need to provide certain electric current to filament, central supported and top electrode power supply connecting rod 1-4 and limit support and bottom electrode power supply connecting rod 1-5 need to add the high pressure of about 4kV, have a little pressure reduction (being about 3.3V) 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, from the electronics of cathode emission, be subject to the effect in magnetic field, will some electron back bombardment to cathode emitter 1-1, go up and pass the top that central supported and top electrode power supply connecting rod 1-4 are got in gap on its crepe cord body, while making its this body of rod work, the temperature at this position is up to 1800 ℃ of left and right.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 ℃ of points, and still, metal molybdenum is 4.9～5.2 * 10 at 20～100 ℃ of interval averages coefficient of linear expansion
-6/ ℃; And higfh-tension ceramics 1-8(is generally containing Al
2o
395% 95 porcelain) at 20～500 ℃ of interval averages coefficient of linear expansion, be 6.5～7.5 * 10
-6/ ℃.When magnetron operating state is good, the temperature of its higfh-tension ceramics 1-8 is generally about 120 ℃ of left and right, 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 being interrupted work because repeatedly standing the impact of strangulated stress, this stress brings adverse effect to the sealing of the soldering portion of the metallized ends leader of higfh-tension ceramics and metal molybdenum and higfh-tension ceramics, affects its sealing and useful life.This situation seems in the microwave high-temperature kiln that adopts magnetron heating outstanding especially (under this environment, the temperature of magnetron middle-high-pressure ceramic 1-8 part is sometimes up to 300 ℃ of left and right), and magnetron more easily damages; In addition, adopt metal molybdenum rod as central supported and top electrode power supply connecting rod and limit support and bottom electrode power supply connecting rod completely, also there is resistivity (resistivity of technical pure polycrystalline molybdenum is 570 μ Ω m) and cost is higher and higfh-tension ceramics between hermetically-sealed construction and welding procedure rate of finished products complicated, in producing 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 central supported and the top electrode power supply connecting rod of magnetron tube core and limit is supported and bottom electrode power supply connecting rod and higfh-tension ceramics between on the basis of hermetically-sealed construction and welding procedure, reduce the quantity of seal, reach the sealing of effective raising magnetron tube core, the reliability in when work, extend its useful life, the rate of finished products in improve producing, reduce production costs, improve the objects such as electrical property of negative electrode.
Solution of the present invention is that the molten point of employing is 1450 ℃, in the temperature range of-20 ℃～500 ℃, average coefficient of linear expansion is 6.6～7.4 * 10
-6/ ℃ the iron nickel cobalt ceramic sealing alloy that surely expands as limit, support and bottom electrode power supply connecting rod 1-5, its coefficient of expansion and higfh-tension ceramics are (as contained Al
2o
395% 95 porcelain) average coefficient of linear expansion 6.5～7.5 * 10
-6/ ℃ extremely close, and central supported and top electrode power supply connecting rod 1-4 are divided into two parts, wherein: through emitter 1-1 center, still adopt metal molybdenum with the upper semisection 1-4.1 that upper shielding cap 1-2 is connected, to guarantee its heat-resisting quantity, while working for magnetron simultaneously, the temperature of lower shielding cap 3 is between 800-1000 ℃, be positioned at the temperature of the lower semisection 1-4.2 of lower shielding cap below 3 lower than 800 ℃, thereby adopt the iron nickel cobalt ceramic sealing alloy that surely expands, on, welding between lower two sections, thereby both guaranteed the heat-resisting quantity of upper semisection 1-4.1, can effectively improve the hermetically-sealed construction between bottom and higfh-tension ceramics again, the reliability of sealing, and the useful life that extends magnetron, the present invention realizes its goal of the invention with this.Thereby, microwave heating of the present invention comprises hot cathode emitter and upper shielding cap and lower shielding cap with magnetron tube core, central supported and top electrode power supply connecting rod, limit is supported and bottom electrode power supply connecting rod, lower magnetic pole, tube core shell, be provided with the hole higfh-tension ceramics that is tightly connected, key is that limit is supported and bottom electrode power supply connecting rod is the iron nickel cobalt ceramic sealing alloy that surely expands, and central supported and top electrode power supply connecting rod are for upper semisection adopts metal molybdenum, the lower semisection employing iron nickel cobalt bimetallic lever that ceramic sealing alloy is welded that surely expands; 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 corresponding seal welding of connecting portion that the bottom of two bodies of rod is tightly connected after Kong Zhongjing metallization and Nickel Plating Treatment with higfh-tension ceramics is respectively integral.
Above-mentioned iron nickel cobalt surely expand ceramic sealing alloy in the temperature range of-20 ℃～500 ℃ average coefficient of linear expansion be 6.6～7.4 * 10
-6/ ℃, resistivity is respectively the 4J33 of 0.46 μ Ω m and 0.45 μ Ω m or the 4J34 iron nickel cobalt ceramic sealing alloy that surely expands.
The present invention is because average coefficient of linear expansion in the temperature range of-20 ℃～500 ℃ of employings is 6.6～7.4 * 10
-6/ ℃, the resistivity iron nickel cobalt that is respectively 0.46 μ Ω m and the 0.45 μ Ω m ceramic sealing alloy 4J33 that surely expands, 4J34 does that limit in magnetron tube core is supported and the lower semisection of bottom electrode power supply connecting rod and central supported and top electrode power supply connecting rod, hermetically-sealed construction and sealing technology between two bodies of rod and higfh-tension ceramics have not only been simplified, effectively improved the sealing of magnetron tube core and the rate of finished products of production, and reduced to a certain extent production cost, improved the electrical property of negative electrode; Adopt iron nickel cobalt surely expand the cost of ceramic sealing alloy material less than half and its resistivity of metal molybdenum also far below 570 μ Ω m of technical pure polycrystalline molybdenum resistivity.Thereby hermetically-sealed construction and welding procedure that the present invention has magnetron tube core are simple, sealing is good, and reliability during work is high, long service life, and rate of finished products in produce 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 magnetron structures and tube core relative position schematic diagram (cutaway view) in magnetron for background technology microwave heating, and wherein solid line is partly that tube core structure schematic diagram, double dot dash line are partly magnetron remainder structural representation;
Fig. 2 is magnetron structures and tube core relative position schematic diagram (cutaway view) in magnetron for microwave heating of the present invention, and wherein solid line is partly for tube core structure schematic diagram of the present invention, double dot dash line are partly 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 is supported and bottom electrode power supply connecting rod, 1-6. lower magnetic pole, shell under 1-7. (being tube core shell), 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
It is example that present embodiment be take 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 (being tube core shell) 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 is all identical with magnetron with background technology same model (specification) microwave heating with size; Its material of the present embodiment higfh-tension ceramics 1-8 is (still for containing Al
2o
395% 95 porcelain), external diameter and Gao Yijun are identical with background technology, but do not metallize and Nickel Plating Treatment in outer face, only metallized in two surfaces, welding position that are tightly connected hole of supporting 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 respectively and Nickel Plating Treatment after, then be integral with limit support 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 respectively; In higfh-tension ceramics 1-8, two are tightly connected that hole, limit are supported 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 is supported and the long 41.5mm of bottom electrode power supply connecting rod 1-5, the long 25mm of upper semisection 1-4.1, the long 29.5mm of lower semisection 1-4.2 of central supported and top electrode power supply connecting rod 1-4, and it is the iron nickel cobalt of the 4J33 ceramic sealing alloy that surely expands that material all adopts the trade mark.
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 is supported and bottom electrode power supply connecting rod, lower magnetic pole, tube core shell, be provided with the hole higfh-tension ceramics that is tightly connected, it is characterized in that limit is supported and bottom electrode power supply connecting rod is the iron nickel cobalt ceramic sealing alloy that surely expands, central supported and top electrode power supply connecting rod are for upper semisection adopts metal molybdenum, the lower semisection employing iron nickel cobalt bimetallic lever that ceramic sealing alloy is welded that surely expands; 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 corresponding seal welding of connecting portion that the bottom of two bodies of rod is tightly connected after Kong Zhongjing metallization and Nickel Plating Treatment with higfh-tension ceramics is respectively integral.
2. by microwave heating magnetron tube core described in claim 1, it is characterized in that the described iron nickel cobalt ceramic sealing alloy that surely expands is that average coefficient of linear expansion is 6.6～7.4 * 10 in the temperature range of-20 ℃～500 ℃
-6/ ℃, resistivity is respectively the 4J33 of 0.46 μ Ω m and 0.45 μ Ω m or the 4J34 iron nickel cobalt ceramic sealing alloy that surely expands.
Priority Applications (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 |
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 true CN103531419A (en) | 2014-01-22 |
| CN103531419B CN103531419B (en) | 2016-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810536A (en) * | 2016-03-31 | 2016-07-27 | 电子科技大学 | Magnetron employing combined cold cathode head and 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 |
| CN113909665A (en) * | 2021-10-22 | 2022-01-11 | 哈尔滨工业大学 | Method for diffusion welding of Kovar alloy with molybdenum-rhenium alloy and intermediate layer |
Citations (6)
| 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 |
| US20020175627A1 (en) * | 2001-05-22 | 2002-11-28 | Sanyo Electric Co., Ltd. | Magnetron and microwave heating device |
| 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 |
-
2013
- 2013-10-25 CN CN201310511985.XA patent/CN103531419B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| US20020175627A1 (en) * | 2001-05-22 | 2002-11-28 | Sanyo Electric Co., Ltd. | Magnetron and microwave heating device |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105810536A (en) * | 2016-03-31 | 2016-07-27 | 电子科技大学 | Magnetron employing combined cold cathode head and production method of cold cathode body |
| 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 |
| CN113909665A (en) * | 2021-10-22 | 2022-01-11 | 哈尔滨工业大学 | Method for diffusion welding of Kovar alloy with molybdenum-rhenium alloy and intermediate layer |
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| Publication number | Publication date |
|---|---|
| CN103531419B (en) | 2016-02-10 |
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