CN202888117U - Cathode air-intake structure and travelling wave tube with the same - Google Patents
Cathode air-intake structure and travelling wave tube with the same Download PDFInfo
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- CN202888117U CN202888117U CN 201220393564 CN201220393564U CN202888117U CN 202888117 U CN202888117 U CN 202888117U CN 201220393564 CN201220393564 CN 201220393564 CN 201220393564 U CN201220393564 U CN 201220393564U CN 202888117 U CN202888117 U CN 202888117U
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- negative electrode
- end cap
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- heat shielding
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Abstract
The utility model discloses a cathode air-intake structure and a travelling wave tube with the same. The cathode air-intake structure comprises an outer heat shield and an end cover, wherein the outer heat shield is an annular structure and can be arranged on periphery of a cathode to contain the cathode, and the end cover is a bowl structure and an opening of the end cover faces the outer heat shield. Two through holes are opened on the end cover. A cathode filament assembly fixed on one end of the cathode can pass through the two through holes and extend outside of the end cover. The advantages of the structure provided by the utility model are that the cathode air-intake structure is adopted to control vacuum degree when the cathode is in a high-temperature operation state, so that influence on cathode emission performances caused by vacuum degree decreasing is avoided.
Description
Technical field
The utility model relates to microwave electron tube field, especially relates to a kind of negative electrode air suction structure and has the travelling wave tube of this negative electrode air suction structure.
Background technology
Travelling wave tube is the microwave vacuum electronic device, utilizes electromagnetic field to control electron beam section motion within it, make that electron beam produces, accelerates, motion, collect and and signal interaction so that reach the purpose that signal amplifies.Travelling wave tube inside is high vacuum environment, and electron beam is at internal operation.Wherein negative electrode produces electron beam, then utilizes focusing electrode, anode electron-beam convergence, acceleration, forms the electron beam of certain cross sectional shape, size and energy, and radio frequency system finishes the exchange of energy, causes signal to obtain amplifying.The negative electrode that produces electron beam is hot cathode often, and material is generally tungsten, and need to be heated to certain temperature could electron emission.
Negative electrode working temperature General Requirements is higher than 1050 ℃, generally adopts filamentray structure to heat to negative electrode.Filament provides the required energy that heats up generally in the bottom of negative electrode to negative electrode, and negative electrode is heated to operating state.At this moment negative electrode and filament have formed a high-temperature area, and its internal material is owing to high temperature action, and environment on every side is again high vacuum state, and its internal material is subject to heating and can exits, and affects the vacuum degree of cathode zone.The reduction of the vacuum degree in cathodic region, the particle meeting bombarding cathode surface of emission can cause the decline of cathode surface emitting performance, even without emission.
The utility model content
In view of this, the travelling wave tube that is necessary to provide a kind of negative electrode air suction structure and has this negative electrode air suction structure, the negative electrode air suction structure of employing, the vacuum degree during the control cathode hot operation is avoided the impact of vacuum degree decline target emitting performance.
The utility model is to realize like this, a kind of negative electrode air suction structure, it comprises outer heat shielding and end cap, should outer heat shielding be that the periphery that circulus can be positioned at negative electrode is housed in this negative electrode, this end cap is bowl structure and its opening surface heat shielding outside this, this end cap offers two through holes, and the cathode filament assembly that is fixed on this negative electrode one end can see through this end cap and extends in outside this end cap via these two through holes.
As the further improvement of such scheme, the wall thickness of this outer heat shielding is in 0.02 ~ 0.25mm scope.Preferably, the wall thickness of this outer heat shielding is 0.03mm.
As the further improvement of such scheme, the wall thickness of this end cap is in 0.02 ~ 0.25mm scope.Preferably, the wall thickness of this end cap is 0.2mm.
The utility model also relates to a kind of travelling wave tube, it comprises negative electrode, is fixed on cathode filament assembly and negative electrode air suction structure on this negative electrode one end, this negative electrode air suction structure comprises the outer heat shielding of circulus and the end cap of bowl structure, the periphery that this outer heat shielding of circulus is positioned at negative electrode is housed in this negative electrode, this end cap is bowl structure and its opening surface heat shielding outside this, this end cap offers two through holes, and this cathode filament assembly stretches in the opening of this end cap and sees through this end cap and extend in outside this end cap via these two through holes.
As the further improvement of such scheme, the wall thickness of this outer heat shielding is in 0.02 ~ 0.25mm scope.Preferably, the wall thickness of this outer heat shielding is 0.03mm.
As the further improvement of such scheme, the wall thickness of this end cap is in 0.02 ~ 0.25mm scope.Preferably, the wall thickness of this end cap is 0.2mm.
As the further improvement of such scheme, the inwall that is somebody's turn to do outer heat shielding of circulus and the ultimate range between this negative electrode are in 0.5 ~ 1.0mm scope.Preferably, inwall and the ultimate range between this negative electrode of being somebody's turn to do outer heat shielding of circulus are 0.8mm.
As the further improvement of such scheme, the distance between this end cap and this negative electrode is in 0.5 ~ 1.0mm scope.Preferably, the distance between this end cap and this negative electrode is 0.6mm.
The negative electrode air suction structure that the utility model provides and have the travelling wave tube of this negative electrode air suction structure, outer heat shielding and end cap are near apart from the high-temperature area position of negative electrode normal operation, when the high temperature of negative electrode normal operation, easily outer heat shielding and end cap are heated, the equal thin-wall construction of outer heat shielding and end cap, material is the vacuum material with high temperature pumping property, when negative electrode works, the high temperature of negative electrode causes the internal material temperature to raise, and exits in the cathodic region, reduces vacuum degree, outer heat shielding and cap material are near negative electrode, heated up by its temperature effect, this is as thin-wall construction simultaneously, and temperature is lower about 100 ℃ than negative electrode working temperature, material itself has air-breathing characteristic in this temperature range, thereby guarantee the vacuum degree of negative electrode service area, the impact of the target emitting performance of avoiding exitting can be kept the cathode emission ability for a long time.
The utility model has the advantage of:
1, the vacuum degree in the time of can keeping the negative electrode hot operation;
2, can keep for a long time the emission characteristics of negative electrode.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing and specific implementation process:
Fig. 1 is the use view of negative electrode air suction structure;
Fig. 2 is the structural representation of outer heat shielding;
Fig. 3 is the structural representation of end cap.
Main symbol description: negative electrode 1, outer heat shielding 2, end cap 3, cathode filament assembly 4.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
See also Fig. 1, Fig. 2 and Fig. 3, the technical solution adopted in the utility model is a kind of negative electrode air suction structure and the travelling wave tube with this negative electrode air suction structure, and this negative electrode air suction structure comprises that outer heat shielding 2 and end cap 3 form.Outer heat shielding 2 is circulus, and end cap 3 is bowl structure.Outer heat shielding 2 is placed on negative electrode 1 periphery, and end cap 3 is placed on the rear end of cathode filament assembly 4, and outer heat shielding 2 and end cap 3 are near apart from the high-temperature area position of negative electrode 1 normal operation.
Take the 5mm negative electrode of airborne Ku wave band 100W travelling wave tube as example, the implementation step is as follows:
Selection material: selecting a kind of high temperature gettering material is the material of negative electrode air suction structure, and temperature can have the vacuum suction effect than 1050 ℃ of low 100-200 of negative electrode working temperature ℃ the time, can't exit under the normal temperature state, and material is originally as vacuum material.The material of finally choosing is metal tantalum or metal niobium.
Design outer heat shielding 2: outer heat shielding 2 is circulus, as shown in Figure 2.Mainly be that the external diameter direction of negative electrode 1 is surrounded, the height of the height of outer heat shielding 2 and negative electrode 1 is close, and the internal diameter of outer heat shielding 2 is identical with negative electrode 1 maximum outside diameter, as shown in Figure 1, the internal diameter of outer heat shielding 2 and negative electrode 1 ultimate range are in the 0.5-1.0mm scope, and preferably, the distance of selection is 0.8mm.The wall thickness of outer heat shielding 2, outer heat shielding 2 temperature can remain on 800-950 ℃ and are as the criterion during according to negative electrode 1 normal operation, are generally 0.02-0.25mm, preferably, selection be 0.03mm.
Design end cap 3: end cap 3 is bowl structure, as shown in Figure 2.Mainly be that filamentray structure (being cathode filament assembly 4) with negative electrode 1 bottom impales, as shown in Figure 1.The thickness of end cap 3 is generally 0.02-0.25mm, here owing to also need filamentray structure is fixed, selection be 0.2mm.Distance of end cap 3 and negative electrode 1 so, in the 0.5-1.0mm scope, outer heat shielding 2 temperature can remain on 800-950 ℃ and are as the criterion during according to negative electrode 1 normal operation, and preferably, the distance of selection is 0.6mm.
Design negative electrode air suction structure: as shown in Figure 1, the bottom of outer heat shielding 2 and negative electrode 1 is fixed, end cap 3 is fixed on the bottom position of negative electrode 1, outer heat shielding 2 and end cap 3 are with negative electrode 1 substantially encirclement except front (surface of emission of electronics).Adopt the travelling wave tube of this negative electrode air suction structure, the emitting performance of its negative electrode 1 is in 0-1000 hour, and basic do not have to change.
In sum, the negative electrode air suction structure that the utility model provides and have the travelling wave tube of this negative electrode air suction structure, outer heat shielding 2 and end cap 3 are near apart from the high-temperature area position of negative electrode 1 normal operation, when the high temperature of negative electrode 1 normal operation, easily outer heat shielding 2 and end cap 3 are heated, outer heat shielding 2 and end cap 3 equal thin-wall constructions, material is the vacuum material with high temperature pumping property, when negative electrode 1 normal operation, the high temperature of negative electrode 1 causes the internal material temperature to raise, exit in the cathodic region, reduce vacuum degree, outer heat shielding 2 and end cap 3 materials are heated up by its temperature effect near negative electrode 1, this is as thin-wall construction simultaneously, temperature is than low about 100 ℃ of negative electrode 1 working temperature, and material itself has air-breathing characteristic in this temperature range, thereby guarantees the vacuum degree of negative electrode 1 service area, avoid the exitting impact of target 1 emitting performance can be kept negative electrode 1 emissivities for a long time.
Therefore, in brief, the utility model has the advantage of: the vacuum degree in the time of 1, can keeping the negative electrode hot operation; 2, can keep for a long time the emission characteristics of negative electrode.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. negative electrode air suction structure, it is characterized in that, it comprises outer heat shielding and end cap, should outer heat shielding be that the periphery that circulus can be positioned at negative electrode is housed in this negative electrode, this end cap is bowl structure and its opening surface heat shielding outside this, this end cap offers two through holes, and the cathode filament assembly that is fixed on this negative electrode one end can see through this end cap and extends in outside this end cap via these two through holes.
2. a kind of negative electrode air suction structure as claimed in claim 1 is characterized in that the wall thickness of this outer heat shielding is in 0.02 ~ 0.25mm scope.
3. a kind of negative electrode air suction structure as claimed in claim 2 is characterized in that, the wall thickness of this outer heat shielding is 0.03mm.
4. a kind of negative electrode air suction structure as claimed in claim 1 is characterized in that the wall thickness of this end cap is in 0.02 ~ 0.25mm scope.
5. a kind of negative electrode air suction structure as claimed in claim 4 is characterized in that, the wall thickness of this end cap is 0.2mm.
6. travelling wave tube, it comprises negative electrode and is fixed on cathode filament assembly on this negative electrode one end, it is characterized in that, this travelling wave tube also comprises such as the described negative electrode air suction structure of any one in the claim 1 to 5, the periphery that should outer heat shielding be positioned at negative electrode of circulus is housed in this negative electrode, this cathode filament assembly stretch in the opening of this end cap and via these two through holes through this end cap and extend in outside this end cap.
7. a kind of travelling wave tube as claimed in claim 6 is characterized in that, the inwall that is somebody's turn to do outer heat shielding of circulus and the ultimate range between this negative electrode are in 0.5 ~ 1.0mm scope.
8. a kind of travelling wave tube as claimed in claim 7 is characterized in that, inwall and the ultimate range between this negative electrode of being somebody's turn to do outer heat shielding of circulus are 0.8mm.
9. a kind of travelling wave tube as claimed in claim 6 is characterized in that, the distance between this end cap and this negative electrode is in 0.5 ~ 1.0mm scope.
10. a kind of travelling wave tube as claimed in claim 9 is characterized in that, the distance between this end cap and this negative electrode is 0.6mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220393564 CN202888117U (en) | 2012-08-09 | 2012-08-09 | Cathode air-intake structure and travelling wave tube with the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220393564 CN202888117U (en) | 2012-08-09 | 2012-08-09 | Cathode air-intake structure and travelling wave tube with the same |
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| Publication Number | Publication Date |
|---|---|
| CN202888117U true CN202888117U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220393564 Expired - Fee Related CN202888117U (en) | 2012-08-09 | 2012-08-09 | Cathode air-intake structure and travelling wave tube with the same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674317A (en) * | 2012-09-11 | 2014-03-26 | 昆山国力真空电器有限公司 | Detachable cathode test device |
-
2012
- 2012-08-09 CN CN 201220393564 patent/CN202888117U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674317A (en) * | 2012-09-11 | 2014-03-26 | 昆山国力真空电器有限公司 | Detachable cathode test device |
| CN103674317B (en) * | 2012-09-11 | 2016-04-06 | 昆山国力真空电器有限公司 | Detachable cathode test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130417 Termination date: 20180809 |