CN1700387A - Film-coated cathode-thermistor assembly - Google Patents
Film-coated cathode-thermistor assembly Download PDFInfo
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- CN1700387A CN1700387A CN 200410038291 CN200410038291A CN1700387A CN 1700387 A CN1700387 A CN 1700387A CN 200410038291 CN200410038291 CN 200410038291 CN 200410038291 A CN200410038291 A CN 200410038291A CN 1700387 A CN1700387 A CN 1700387A
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- cathode
- support tube
- heater assembly
- dividing plate
- negative electrode
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Abstract
This invention relates to microwave element technique field and to one vacuum covering film negative electron. The said negative electrode comprises negative bottom, supportive cylinder, isolation part and spiral tungsten filament, wherein the negative electrode supportive cylinder is isolated to the bottom connection terminal; the isolation plate is inserted into the supportive chamber connected to the supportive cylinder to make the cylinder top, outer surface and the bottom of step shapes.
Description
Technical field
The present invention relates to the microwave device technical field, is film cathode in a kind of vacuum device---heater assembly.
Background technology
Along with the development of microwave device to the high-frequency high-power direction, the target current density has proposed more and more higher requirement, traditional oxide coated cathode can not satisfy, metal diffusing type film cathode electronics is launched big but the working temperature height, therefore heating power is big, for the space microwave device, because the restriction of power has proposed harsh requirement to its efficiency of heating surface.Therefore, improving the negative electrode efficiency of heating surface, to make it be very necessary in the working temperature that alap heating power is issued to metal diffusing type negative electrode.Because very large impact and vibrations will be born with microwave device in the space, reliability, the stability of this target and heater are had higher requirement on the other hand.Because negative electrode---heater assembly has the heating power of saving, guarantee that the negative electrode working stability is reliable, shock-resistant, vibration resistance, characteristics such as increase the service life, therefore negative electrode---heater assembly technology being used on the vacuum microwave device more and more widely is especially on the Space Microwave device.Negative electrode---heater assembly generally comprises negative electrode, tungsten filament and supports the dielectric of these helical tungsten filamens, and dielectric is Al normally
2O
3, it can bear the test of relatively-high temperature.
Fig. 1 is a negative electrode---the general structure chart of heater assembly, and 1 is the substrate of tungsten sponge among the figure, and 2 is the cathode support tube, and 3 is Al
2O
3Insulator, 4 is spiral helicine tungsten filament.But this structure has several shortcomings: the first, and when making heater assembly, lytic agent in the dielectric and binding agent etc. can infiltrate in the spongiform cathode substrate of tungsten, thereby cause the cathode emission level to descend.The second, a large amount of simple substance barium atoms that negative electrode produces in the course of the work infiltrate the heater assembly from the back of cathode substrate, produce electric leakage between heater and dielectric, heater and the cathode tube thereby cause, and make the negative electrode cisco unity malfunction.The 3rd, adopt electron beam or laser welding method between cathode substrate and the molybdenum tube, because the thermal coefficient of expansion of the support tube of spongiform cathode substrate of tungsten and Mo is different, can cause cathode substrate and support tube sealing-off after negative electrode work a period of time, thereby cause the impact resistance of negative electrode to descend.
Summary of the invention
The objective of the invention is to overcome conventional cathode---the shortcoming of heater assembly, design a kind of novel film cathode---heater assembly structure, its weldering knot is firm, and the heat efficiency and reliability height do not have electric leakage and lytic agent and binding agent to the cathode substrate phenomenon of osmosis.
For achieving the above object, technical solution of the present invention provides a kind of film cathode---heater assembly, by cathode substrate, the cathode support tube, insulator and helical tungsten filamen are formed, and its cathode support tube and cathode substrate link are dividing plate sealing, and dividing plate slightly gos deep into the support tube inner chamber, be connected as a single entity with support tube, make the joint face of cathode support tube end, dividing plate outer surface and cathode substrate bottom surface be step-like.
Described film cathode---heater assembly between its described cathode support tube end, dividing plate outer surface and cathode substrate bottom surface, is affixed by brazing metal.
Described film cathode---heater assembly, its described dividing plate and cathode support tube are manufactured from the same material.
Described film cathode---heater assembly, its described dividing plate and cathode support tube are made by Mo.
Described film cathode---heater assembly, its described brazing metal and cathode substrate and cathode support tube all soak into, and its molten some temperature is less than molten some temperature of emitting material in the cathode substrate, greater than the negative electrode normal working temperature.
Description of drawings
Fig. 1 is existing negative electrode---the general structure chart of heater assembly;
Fig. 2 is a negative electrode of the present invention---the heater assembly structural representation;
Fig. 3 is a negative electrode of the present invention---heater assembly and existing negative electrode---the heater heating power of heater assembly and the relation curve comparison diagram of cathode temperature.
Embodiment
As shown in Figure 2,1 is the substrate of tungsten sponge among the figure, and 2 is dividing plate, and 3 is the cathode support tube, and 4 is Al
2O
3Insulator, 5 is spiral helicine tungsten filament.Wherein, cathode support tube 3 is a dividing plate 2 sealings with cathode substrate 1 link, and dividing plate 2 slightly gos deep into support tube 3 inner chambers, is connected as a single entity with support tube 3, makes the joint face of cathode support tube 3 ends, dividing plate 2 outer surfaces and cathode substrate 1 bottom surface be step-like.
The present invention adds one deck dividing plate 2 between cathode substrate 1 and heater assembly, so just avoided the use conventional cathode---preceding two shortcomings of heater assembly, but can produce the gap between cathode substrate 1 and the dividing plate 2 like this, thereby cause heat conduction bad, reduce negative electrode---the heat efficiency of heater assembly.For solving this difficult problem, the present invention selects a kind of brazing metal for use, cathode substrate 1 and dividing plate 2, support tube 3 are welded together, avoided gap between cathode substrate 1 and the dividing plate 2 to improve the heat efficiency of negative electrode one heater assembly so on the one hand, the cathode substrate 1 and the adhesion of support tube 3 are improved greatly, thereby increase the impact resistance of negative electrode.But this scolder must possess following characteristics: the first, and it must all soak into cathode substrate 1 and support tube 3, could guarantee firm welding like this.The second, its fusing point must be lower than molten some temperature of emitting material in the cathode substrate 1, otherwise causes the evaporation of emitting material in welding process.The 3rd, its molten some temperature must be far above negative electrode normal working temperature (generally being lower than 1100 ℃) otherwise cause the loss of scolder in the negative electrode course of work, and then cause the adhesion between cathode substrate 1 and the support tube 3 to descend, and the performance that influences microwave device.The present invention has developed a kind of scolder that possesses above three characteristics simultaneously by a series of tests.
Fig. 3 has provided tradition and has improved the back negative electrode---and the heater heating power of heater assembly and the relation curve of cathode temperature, curve 1 are the traditional negative electrode one heater assembly heating power and the relation curve of cathode temperature.Curve 2 is the relation curves that improve back negative electrode one heater assembly heating power and cathode temperature.Can find out on scheme and improve the back negative electrode---the heat efficiency of heater assembly does not reduce, and that is to say three big shortcomings of negative electrode---heater assembly has overcome conventional cathode under the undiminished prerequisite of the heat efficiency---heater assembly after the improvement.
Claims (4)
1. a film cathode---heater assembly, by cathode substrate, the cathode support tube, insulator and helical tungsten filamen are formed, it is characterized in that: cathode support tube and cathode substrate link are dividing plate sealing, dividing plate slightly gos deep into the support tube inner chamber, is connected as a single entity with support tube, makes the joint face of cathode support tube end, dividing plate outer surface and cathode substrate bottom surface be step-like.
2. film cathode as claimed in claim 1---heater assembly is characterized in that: between described cathode support tube end, dividing plate outer surface and cathode substrate bottom surface, be affixed by brazing metal.
3. film cathode as claimed in claim 1 or 2---heater assembly is characterized in that: described dividing plate and cathode support tube are manufactured from the same material.
4. film cathode as claimed in claim 1 or 2---heater assembly is characterized in that: described dividing plate and cathode support tube are made by Mo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410038291 CN1700387A (en) | 2004-05-20 | 2004-05-20 | Film-coated cathode-thermistor assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410038291 CN1700387A (en) | 2004-05-20 | 2004-05-20 | Film-coated cathode-thermistor assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1700387A true CN1700387A (en) | 2005-11-23 |
Family
ID=35476373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410038291 Pending CN1700387A (en) | 2004-05-20 | 2004-05-20 | Film-coated cathode-thermistor assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1700387A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128903A (en) * | 2016-08-31 | 2016-11-16 | 安徽华东光电技术研究所 | A kind of novel cathode molybdenum barrel structure and manufacture method thereof |
| CN113808892A (en) * | 2021-09-22 | 2021-12-17 | 中国科学院空天信息创新研究院 | Composite heater assembly and method of making the same |
| CN113828879A (en) * | 2021-08-12 | 2021-12-24 | 南京三乐集团有限公司 | High-efficiency high-consistency cathode assembly welding method for Ku-waveband communication traveling wave tube |
-
2004
- 2004-05-20 CN CN 200410038291 patent/CN1700387A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128903A (en) * | 2016-08-31 | 2016-11-16 | 安徽华东光电技术研究所 | A kind of novel cathode molybdenum barrel structure and manufacture method thereof |
| CN113828879A (en) * | 2021-08-12 | 2021-12-24 | 南京三乐集团有限公司 | High-efficiency high-consistency cathode assembly welding method for Ku-waveband communication traveling wave tube |
| CN113828879B (en) * | 2021-08-12 | 2023-02-28 | 南京三乐集团有限公司 | High-efficiency high-consistency cathode assembly welding method for Ku-waveband communication traveling wave tube |
| CN113808892A (en) * | 2021-09-22 | 2021-12-17 | 中国科学院空天信息创新研究院 | Composite heater assembly and method of making the same |
| CN113808892B (en) * | 2021-09-22 | 2023-10-20 | 中国科学院空天信息创新研究院 | Composite thermal subassembly and method of making the same |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |