CN111029229A - Boron nitride clamping rod degassing device and method for traveling wave tube - Google Patents
Boron nitride clamping rod degassing device and method for traveling wave tube Download PDFInfo
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- CN111029229A CN111029229A CN201911172938.0A CN201911172938A CN111029229A CN 111029229 A CN111029229 A CN 111029229A CN 201911172938 A CN201911172938 A CN 201911172938A CN 111029229 A CN111029229 A CN 111029229A
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- tube
- boron nitride
- clamping rod
- alumina
- hot wire
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- 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
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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
- H01J23/005—Cooling methods or arrangements
-
- 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
- H01J23/36—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy
- H01J23/40—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit
- H01J23/48—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type
- H01J23/50—Coupling devices having distributed capacitance and inductance, structurally associated with the tube, for introducing or removing wave energy to or from the interaction circuit for linking interaction circuit with coaxial lines; Devices of the coupled helices type the interaction circuit being a helix or derived from a helix
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a degassing device and a degassing method for a boron nitride clamping rod for a traveling wave tube, wherein the degassing device comprises a heating device and a heat preservation device, the working environment is a vacuum environment, the heating device comprises a hot wire and a polycrystalline alumina ceramic tube for placing the boron nitride clamping rod, the hot wire is wound on the polycrystalline alumina ceramic tube, and the hot wire is connected with a heating power supply electrode; the heat preservation device comprises a first alumina tube and a second alumina tube; the first alumina pipe is nested outside the second alumina pipe, the polycrystalline alumina ceramic pipe wound with the hot wire is placed in the second alumina pipe, and a boron nitride clamping rod degassing method for the traveling wave pipe is provided.
Description
Technical Field
The invention relates to a degassing device and a degassing method, in particular to a degassing device and a degassing method for a boron nitride clamping rod for a traveling wave tube, and belongs to the field of vacuum electronic devices.
Background
In recent years, with the development of traveling wave tubes, higher requirements are put on vacuum environment, and especially, the quality of vacuum in the tube directly influences the performance and the service life of the device. The limit value and the stability degree of the vacuum degree in the tube can be determined by vacuum equipment, and are mainly related to the material of the traveling wave tube, so that higher requirements are put on the material of the traveling wave tube. At present, in the aspect of traveling wave tube materials, the vacuum quality is difficult to be improved by completely depending on the improvement of the performance of vacuum materials. But can meet the requirement of high vacuum quality of the traveling wave tube by the pretreatment or surface treatment of the material.
In the helix traveling wave tube, the clamping rods mainly play a role in supporting the helix and transferring heat in the tube to the outside of the tube. In order to ensure high-quality vacuum in the spiral traveling wave tube, the clamping rods must have equivalent air tightness and surface cleanness. After the clamping rod made of the boron nitride material is subjected to the processes of grinding, cleaning, carburizing and the like, impurities introduced in the processing process exist on the surface of the clamping rod, and gas, water vapor, floating dust and the like in the air can be adsorbed on the surface of the clamping rod.
Disclosure of Invention
The purpose of the invention is as follows: the first purpose of the invention is to provide a boron nitride clamping rod degassing device for a traveling wave tube, which has high degassing efficiency and convenient operation, and the second purpose of the invention is to provide a boron nitride clamping rod degassing method for a traveling wave tube.
The technical scheme is as follows: the degassing device for the boron nitride clamping rod for the traveling wave tube comprises a heating device and a heat preservation device, wherein the working environment is a vacuum environment, the heating device comprises a hot wire and a polycrystalline alumina ceramic tube for placing the boron nitride clamping rod, the hot wire is wound on the polycrystalline alumina ceramic tube, and the hot wire is connected with a heating power supply electrode; the heat preservation device comprises a first alumina pipe and a second alumina pipe; the first alumina pipe is nested outside the second alumina pipe, and the polycrystalline alumina ceramic pipe wound with the hot wire is placed in the second alumina pipe.
Furthermore, the heating device is provided with a tungsten-rhenium thermocouple, and the thermocouple is arranged in the polycrystalline alumina ceramic tube during operation.
Furthermore, the heating device is provided with a temperature control meter which is connected with a tungsten-rhenium thermocouple.
Further, the hot wire is made of molybdenum wire.
Further, the hot wire is connected with a heating power supply electrode.
The invention discloses a degassing method of a boron nitride clamping rod for a traveling wave tube, which utilizes a degassing device of the boron nitride clamping rod for the traveling wave tube and comprises the following steps:
winding a hot wire on a polycrystalline alumina ceramic tube, and putting the polycrystalline alumina ceramic tube into a boron nitride clamping rod;
embedding a first alumina tube and a second alumina tube on each other, and placing a polycrystalline alumina ceramic tube wound with a hot wire in the second alumina tube;
connecting two ends of the hot wire to the heating power supply electrode;
step four, vacuumizing, and when the vacuum degree reaches 8.0 multiplied by 10-4Pa～1×10-3When Pa, turning on a heating power supply, and heating to 700-1300 ℃;
and step five, vacuumizing and cooling to room temperature.
Further, the degree of vacuum during heating was maintained at 4.0X 10-4Pa～2×10-3In the Pa range.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
the boron nitride clamping rod degassing device for the traveling wave tube has the advantages of reasonable design, simple structure, convenience in operation and high degassing efficiency; before the traveling wave tube is installed, the boron nitride clamping rods are subjected to vacuum heating, oxide layers, attachments, adsorbed gases and the like on the surface of the boron nitride are removed, the stability of the spiral flow of the traveling wave tube is improved, and the performance and the service life of the traveling wave tube are ensured; the boron nitride clamping rod obtained by the degassing device has a clean surface and has no defects of edge jumping, corner missing and the like.
Drawings
FIG. 1 is a structural view of a heating apparatus of the present invention;
FIG. 2 is a cross-sectional view of a degassing apparatus for a boron nitride clamping bar for a traveling wave tube according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, a hot wire 1 of the present invention is tightly wound around a polycrystalline alumina ceramic tube 2 to facilitate efficient heat transfer.
As shown in fig. 2, the degassing device for the boron nitride clamping rod for the traveling wave tube of the present invention comprises a heating device and a heat preservation device, wherein the working environment is a vacuum environment, the heating device comprises a hot wire 1 and a polycrystalline alumina ceramic tube 2 for placing the boron nitride clamping rod, the hot wire 1 is wound on the polycrystalline alumina ceramic tube 2, and the hot wire is connected with a heating power supply electrode; the heat preservation device comprises a first alumina pipe 3 and a second alumina pipe 4; the first alumina tube 3 is nested outside the second alumina tube 4, and the polycrystalline alumina ceramic tube 2 wound with the hot wire 1 is placed in the second alumina tube 4.
The invention discloses a degassing method of a boron nitride clamping rod for a traveling wave tube, which utilizes a degassing device of the boron nitride clamping rod for the traveling wave tube and comprises the following steps:
winding a hot wire 1 on a polycrystalline alumina ceramic tube 2, and putting the tube into a boron nitride clamping rod;
embedding a first alumina tube 3 and a second alumina tube 4, and placing a polycrystalline alumina ceramic tube 2 wound with a hot wire 1 in the second alumina tube 4;
connecting two ends of the hot wire 1 to the heating power supply electrode;
step four, vacuumizing, and when the vacuum degree reaches 8.0 multiplied by 10-4Pa～1×10-3When Pa is needed, the heating power supply is turned on, the temperature is heated to 700-1300 ℃, and the vacuum degree in the heating process is kept at 4.0 multiplied by 10-4Pa～2×10-3Within the range of Pa;
and step five, vacuumizing and cooling to room temperature.
Claims (6)
1. The utility model provides a boron nitride supporting rod degassing unit for travelling wave tube which characterized in that: the degassing device comprises a heating device and a heat preservation device, the working environment is a vacuum environment, the heating device comprises a hot wire (1) and a polycrystalline alumina ceramic tube (2) for placing a boron nitride clamping rod, the hot wire (1) is wound on the polycrystalline alumina ceramic tube (2), and the hot wire (1) is connected with a heating power supply electrode; the heat preservation device comprises a first alumina pipe (3) and a second alumina pipe (4); the first alumina tube (3) is nested outside the second alumina tube (4), and the polycrystalline alumina ceramic tube (2) wound with the hot wire (1) is placed in the second alumina tube (4).
2. The degassing apparatus for a boron nitride clamping rod used for a traveling-wave tube according to claim 1, characterized in that: the heating device is provided with a tungsten-rhenium thermocouple, and the thermocouple is arranged in the polycrystalline alumina ceramic tube (2) during operation.
3. The degassing apparatus for a boron nitride clamping rod used for a traveling-wave tube according to claim 2, characterized in that: the heating device is provided with a temperature control meter, and the temperature control meter is connected with a tungsten-rhenium thermocouple.
4. The degassing apparatus for a boron nitride clamping rod used for a traveling-wave tube according to claim 1, characterized in that: the hot wire (1) is made of molybdenum wire.
5. A method for degassing a boron nitride clamping rod for a traveling wave tube, which is characterized in that the degassing device for the boron nitride clamping rod for the traveling wave tube in claim 1 is used, and comprises the following steps:
winding a hot wire (1) on a polycrystalline alumina ceramic tube (2), and putting the polycrystalline alumina ceramic tube into a boron nitride clamping rod;
embedding a first alumina tube (3) and a second alumina tube (4) mutually, and placing a polycrystalline alumina ceramic tube (2) wound with a hot wire (1) in the second alumina tube (4);
connecting two ends of the hot wire (1) to electrodes of a heating power supply;
step four, vacuumizing, and when the vacuum degree reaches 8.0 multiplied by 10-4Pa～1×10-3When Pa, turning on a heating power supply, and heating to 700-1300 ℃;
and step five, vacuumizing and cooling to room temperature.
6. The degassing method for the traveling-wave tube by using the boron nitride clamping rod as claimed in claim 5, wherein the degassing method comprises the following steps: the vacuum degree of the heating process is kept at 4.0 x 10-4Pa～2×10-3In the Pa range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911172938.0A CN111029229B (en) | 2019-11-26 | 2019-11-26 | Boron nitride clamping rod degassing device and method for traveling wave tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911172938.0A CN111029229B (en) | 2019-11-26 | 2019-11-26 | Boron nitride clamping rod degassing device and method for traveling wave tube |
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| Publication Number | Publication Date |
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| CN111029229A true CN111029229A (en) | 2020-04-17 |
| CN111029229B CN111029229B (en) | 2022-06-21 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02296772A (en) * | 1989-05-09 | 1990-12-07 | Nec Corp | Support for traveling-wave tube |
| JPH0383863A (en) * | 1989-08-28 | 1991-04-09 | Nec Corp | Ceramic composite material and its production |
| US5071055A (en) * | 1984-12-18 | 1991-12-10 | Thomson Csf | Travelling wave tube with a helix-tube delay line attached to a sleeve through the use of boron nitride dielectric supports |
| CN201946558U (en) * | 2010-12-21 | 2011-08-24 | 安徽华东光电技术研究所 | Spiral line clamping structure using clamping rods made of multiple medium materials |
| CN202940213U (en) * | 2012-10-23 | 2013-05-15 | 安徽华东光电技术研究所 | Short absorber manufacturing tool |
| CN104485270A (en) * | 2014-11-10 | 2015-04-01 | 安徽华东光电技术研究所 | Manufacturing process of slow wave system for helix travelling wave tube |
-
2019
- 2019-11-26 CN CN201911172938.0A patent/CN111029229B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5071055A (en) * | 1984-12-18 | 1991-12-10 | Thomson Csf | Travelling wave tube with a helix-tube delay line attached to a sleeve through the use of boron nitride dielectric supports |
| JPH02296772A (en) * | 1989-05-09 | 1990-12-07 | Nec Corp | Support for traveling-wave tube |
| JPH0383863A (en) * | 1989-08-28 | 1991-04-09 | Nec Corp | Ceramic composite material and its production |
| CN201946558U (en) * | 2010-12-21 | 2011-08-24 | 安徽华东光电技术研究所 | Spiral line clamping structure using clamping rods made of multiple medium materials |
| CN202940213U (en) * | 2012-10-23 | 2013-05-15 | 安徽华东光电技术研究所 | Short absorber manufacturing tool |
| CN104485270A (en) * | 2014-11-10 | 2015-04-01 | 安徽华东光电技术研究所 | Manufacturing process of slow wave system for helix travelling wave tube |
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| Publication number | Publication date |
|---|---|
| CN111029229B (en) | 2022-06-21 |
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