CN106683960B - Adjustable magnetron cathode cable microwave leakage protective device - Google Patents
Adjustable magnetron cathode cable microwave leakage protective device Download PDFInfo
- Publication number
- CN106683960B CN106683960B CN201710004089.2A CN201710004089A CN106683960B CN 106683960 B CN106683960 B CN 106683960B CN 201710004089 A CN201710004089 A CN 201710004089A CN 106683960 B CN106683960 B CN 106683960B
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- Prior art keywords
- sleeve
- microwave
- protective device
- microwave leakage
- cathode cable
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Classifications
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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
- H01J23/14—Leading-in arrangements; Seals therefor
- H01J23/15—Means for preventing wave energy leakage structurally associated with tube leading-in arrangements, e.g. filters, chokes, attenuating devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P3/00—Waveguides; Transmission lines of the waveguide type
- H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
- H01P3/06—Coaxial lines
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- Constitution Of High-Frequency Heating (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention discloses a kind of adjustable magnetron cathode cable microwave leakage protective device, microwave can strictly be limited in coaxial line system and substantially reduce microwave leakage by the coaxial transmission cable architecture which is differed greatly using coaxial transmission line and characteristic impedance.Uniform microwave transmission line is combined with resistance film, resistance film is plated on one inner surface of sleeve, is conducive to effectively consume leakage microwave power, improve radiating efficiency and avoids generating hot spot.Sleeve one and two joint face position of sleeve are adjustable, to ensure integral multiple of one length of sleeve not equal to half-wavelength and can adjust one space of sleeve according to practical leakage microwave power size, reduce volume.The present invention efficiently solves the problems, such as the microwave leakage caused by magnetron frequency drift cathode cable.Solve the problems, such as conventional cathode LC filtering conducting wire spatial microwave radiation.It can apply to continuous wave, cathode microwave leakage that is high-power, working long hours protects.
Description
Technical field
The present invention relates to magnetron, especially adjustable magnetron cathode cable microwave leakage protective device.
Background technology
Application of the magnetron in industry, science and medicine (IMS) research is increasingly extensive, and application field constantly expands.It is special
It is not to have the characteristics that continuous wave, high-power, long-time in industry heating application, the microwave leakage of magnetron will be to control at this time
Circuit processed generates detrimental effects.In addition it is the permanently effective work for ensuring electronic product and the electromagnetic protection to environment, various countries pair
Electronic product has formulated stringent electromagnetic compatibility (EMC) standard, it is therefore necessary to be carried out to electromagnetic compatibility (EMC) performance of magnetron
Optimization.The leakage power of magnetron cathode lead-out wire be can not ignore.At present to there are two types of the processing methods of this problem, i.e., to cathode
Lead-out wire adds chokes sleeve and LC to filter the combined sleeve that sleeve or chokes sleeve and LC are filtered.But both structures have centainly
Defect:For chokes sleeve, because the microwave that magnetron generates has certain discrete range, quarter-wave condition
Cannot strictly it meet, in addition when microwave energy cannot consume (being more than its capacity) in time in chokes sleeve, microwave will also be let out
It spills.Sleeve is filtered to LC, its filtering access is had to as stringent microwave transmission line just when working in microwave frequency band
Microwave can be limited on transmission line, to which microwave is filtered out.
Universal at present directly to be filtered using the method for metal contact wires ground connection, such microwave is inevitably from ground connection
It is radiated on line aerial.When test, load when the power on ground wire is -30, energy on line with the raising of frequency and
It reduces.When frequency is higher than 60MHz, 90% or more energy is all radiated among space.In addition, test is found with specified defeated
Go out radiation of the raising magnetron cathode cable of power at working frequency persistently to increase.Actually existing industrial high-power magnetic control
Usually there is the case where microwave is coupled to control rack by cathode cable in pipe, seriously affects the normal work of magnetron.Often now
Emergency measure is：One section of shielded layer is peeled off in the input terminal of magnetron cathode cable, but does so existing defects, a side
Face microwave signal can be radiated environment space, cause electromagnetic pollution, product that cannot meet relevant electromagnetic compatibility standard environment,
The electromagnetic signal of another aspect environment space may also be met by cable, hole is coupled to control rack, is influencing control system just
Often work.
Invention content
The technical problems to be solved by the invention the shortcomings that aiming at prior art microwave leakage protective device, provide
A kind of adjustable high-power, magnetron cathode cable microwave leakage protective device for working long hours, utilizes reflection coaxial line structure
Microwave leakage is prevented with resistance film material.
The present invention solves the technical problem, the technical solution adopted is that, adjustable magnetron cathode cable microwave leakage
Protective device, it is circular sleeve one to have cross section；Sleeve two is mounted on one end of sleeve and realizes that position can by screw thread
It adjusts, sleeve two is nested on the inner wire with ceramic insulation cylinder；Inner wire passes through ceramics along sleeve one and two central axes of sleeve
Insulating cylinder is connect with cathode cable；Joint face is mounted on the beginning of sleeve one, and resistance film, sleeve are coated on one inner surface of sleeve
Cooling fin is installed on one outer surface；Ceramic insulation cylinder outer surface is coated with resistance film；One internal diameter D of sleeve is sufficiently large, with
Ensure enough resistance film surface areas；Two internal diameter d of sleeve is sufficiently small, with ensure the characteristic impedance differences of two sections of coaxial lines compared with
Greatly, increase the reflectance factor of junction；Control D:D is not less than 8；One end of sleeve connects the prodigious coaxial biography of a characteristic impedance difference
Defeated linear load.
The adjustable magnetron cathode cable microwave leakage protective device of the present invention, inner wire and sleeve one, two structure of sleeve
At coaxial line Transmission system, the microwave energy of magnetron cathode cable leakage is in coaxial transmission line transmission process, by sleeve
Resistance film on surface and ceramic insulation cylinder outer surface fully absorbs, and the heat of conversion is by cooling fin or cooling device band
It walks, ensure that the normal work of coaxial line Transmission system, improve the reliability of protective device.In the present invention, sleeve one and set
Two junctions of cylinder constitute coaxial linear load, since the characteristic impedance difference of 2 two sections of coaxial lines of sleeve one and sleeve is larger, connect
Reflectance factor at junction will be very big, can be limited in most microwave energies in this section of space of one length of sleeve, facilitate electricity
Resistance film fully absorbs microwave energy, to prevent microwave leakage to greatest extent.The microwave energy that small part enters sleeve two can
It is fully absorbed by the resistance film on ceramic insulation cylinder outer surface.Sleeve one and two joint face position of sleeve are adjustable, to ensure to cover
One length of cylinder is not equal to the integral multiple of half-wavelength and can adjust one space of sleeve according to practical leakage microwave power size, reduces
Volume.Another aspect inner wire using the uniform of coaxial line Transmission system is ensured, avoid bringing due to too early generating reflection
Hot issue.The heat that resistance film can generate absorption microwave by cooling fin or cooling device on this one inner surface of outer sleeve
Amount is quickly taken away.
Further, one internal diameter D of the sleeve is sufficiently large, to ensure enough resistance film surface areas.Due to sleeve one
It is equivalent to the outer conductor of coaxial line Transmission system, internal diameter should also be protected other than meeting coaxial transmission line power capacity requirement
Resistance film surface area is demonstrate,proved, so that microwave fully absorbs.
Further, one length long enough of the sleeve, and not equal to the integral multiple of half-wavelength.
One length long enough of sleeve fully absorbs and Quick diffusing heat conducive to microwave.Length sleeve is not equal to half-wavelength
Integral multiple avoids generating hot spot to ensure not generating damped vibration and keep heat branch uniform.
Further, the cooling fin is along one radially uniform distribution of sleeve.
Further, the cooling fin is axially uniformly distributed along sleeve one.Cooling fin, which is uniformly distributed, to be conducive to improve heat dissipation
Efficiency.
Further, two internal diameter d of the sleeve is sufficiently small, and the characteristic impedance difference to ensure two sections of coaxial lines is larger, increases
The reflectance factor of big junction.
Further, two length long enough of the sleeve, to ensure that small part reaches fully absorbing for the microwave of sleeve two.
The joint face, sleeve one, sleeve two and cooling fin are made of good conductor.
Joint face, sleeve one, sleeve two and cooling fin are made using good conductor, in favor of closing microwave energy and prevented micro-
Wave leaks, and cooling fin uses good conductor, in favor of improving radiating efficiency, ensures microwave leakage protective device normal operation.
More specifically, the good conductor is copper material.
Joint face, sleeve and cooling fin are made using copper material, there is enough intensity and excellent electrical and thermal conductivity performance, and
Have the characteristics that easy to process.
The invention has the advantages that the coaxial transmission cable architecture to be differed greatly using coaxial transmission line and characteristic impedance,
Microwave can be strictly limited in coaxial line system and substantially reduce microwave leakage.By uniform microwave transmission line and resistance film knot
It closes, plates resistance film on one inner surface of sleeve, be conducive to effectively consume leakage microwave power, improve radiating efficiency and avoid producing
Heat point.Sleeve one and two joint face position of sleeve are adjustable, with ensure one length of sleeve not equal to half-wavelength integral multiple and can
To adjust one space of sleeve according to practical leakage microwave power size, volume is reduced.
The present invention efficiently solves the problems, such as the microwave leakage caused by magnetron frequency drift cathode cable.Have
Effect solves the problems, such as conventional cathode LC filtering conducting wire spatial microwave radiation.Timely and effectively consumption cathode leaks microwave power,
It can apply to continuous wave, cathode microwave leakage that is high-power, working long hours protects.It can be used for frequency modulated magnetron (broadband)
Cathode microwave leakage protects.
Description of the drawings
Fig. 1 is the schematic diagram of embodiment 1；
Fig. 2 is the A-A sectional views of Fig. 1；
Fig. 3 is the schematic diagram of embodiment 2；
Fig. 4 is the B-B sectional views of Fig. 3；
Fig. 5 is microwave leakage distribution map on the outside of certain magnetron；
Fig. 6 is after installing magnetron cathode cable microwave leakage protective device of the present invention, at identical magnetron same position
Microwave leakage distribution map.
Specific implementation mode
With reference to the accompanying drawings and embodiments, detailed description of the present invention technical solution.
Embodiment 1
The present embodiment is illustrated by taking the high power magnetron cathode cable microwave leakage protective device of 2.45GHz as an example.
As shown in Figure 1, 2, this example magnetron cathode cable microwave leakage protective device, including it is sleeve 1, joint face 2, interior
Conductor 3, sleeve 24, resistance film 5, ceramic insulation cylinder 6 and cooling fin 7.This example resistance film 5 uses nichrome, and thickness is
0.02mm.This example joint face 2 is mounted on one 1 beginning of sleeve, and sleeve 24 is mounted on one 1 end of sleeve, and ceramic insulation cylinder 6 is installed
Between inner wire 3 and sleeve 24, by Fig. 1 and Fig. 2 as it can be seen that this example sleeve cross section is circle, the cooling fin installed on sleeve
7 along sleeve 1 it is axial install at a certain distance it is a piece of, at being uniformly distributed.Inner wire 3 passes through sleeve along one 1 central axes of sleeve
24 connect with joint face 2, are connect with magnetron cathode cable (not shown) by joint face 2.Resistance film 5 is plated in set
On one 1 inner surfaces of cylinder and 6 outer surface of ceramic insulation cylinder.In this example, sleeve 1, joint face 2, sleeve 24 and cooling fin 7 are adopted
It is made of good conductor copper material.One 1 diameter D of its middle sleeve is 5cm, and inner wire diameter d is 4mm, 24 a diameter of 6mm of sleeve.In order to
It reduces microwave leakage and improves radiating efficiency, joint face 2, sleeve 1, cooling fin 7, sleeve 24 and inner wire 3 are all close electricity
Contact, the thickness of ceramic insulation cylinder 6 should be as small as possible, and are formed and be in close contact with inner wire 3 and sleeve 24, be let out with reducing microwave
Leakage.In order to ensure that microwave fully absorbs, one 1 diameter D of sleeve is sufficiently large, with ensure enough resistance film surface areas and fully
Power capacity, so that microwave quickly absorbs.24 internal diameter of sleeve is sufficiently small, to ensure the characteristic impedance phase of two sections of coaxial lines
Difference is larger, increases the reflectance factor of junction
As shown in Fig. 2, this example inner wire 3 forms coaxial transmission line with sleeve 1, microwave is made to be transmitted in transmission line.Set
Resistance film 5 is plated on one 1 inner surfaces of cylinder, microwave is made to be absorbed in transmission process.Adjust sleeve 1 and 24 junction of sleeve
Position can meet the requirement of different capacity capacity and working band.By connecing a characteristic impedance difference in one 1 end of sleeve
Prodigious coaxial transmission linear load makes the remaining microwave energy overwhelming majority be reflected back coaxial transmission line and is inhaled again by resistance film 5
It receives.Remaining very little part microwave energy can be sponged by resistance film 5 on 6 outer surface of ceramic insulation cylinder.By being mounted on set
Cooling fin 7 on cylinder 1 can in time distribute the heat generated during lossy microwave, ensure the normal work of sleeve
Make.
Embodiment 2
As shown in Figure 3, Figure 4, this example radiator 7 is a water-cooling structure, and it is ring-like to form a cylinder along one 1 outer surface of sleeve
Confined space, lower left are water inlet, and upper right side is water outlet, in favor of the heat generated during lossy microwave is dissipated in time
It sends out.Cannulated sleeve may be used in this example radiator 7 and the sheet metal copper sheet at both ends is welded on structure on one outer surface of sleeve
At.This example magnetron cathode cable microwave leakage protective device structure other structures are same as Example 1, and details are not described herein again.
Magnetron cathode cable microwave leakage protective device using the present invention, substitutes chokes sleeve and LC filters sleeve
Design, reduce the complexity of design cost and system, have it is simple in structure, it is compact small and exquisite, it is easy to process, it is of low cost, easily
In production the characteristics of.
By practical measurement, before not installing the device of the invention, the leakage electric field in outfield reaches in 2.45GHZ frequency points
20V/m, as shown in figure 5, and after having added apparatus of the present invention, the leakage electric field of same position is only 4.7mV/m or so, such as Fig. 6 institutes
Show, has reached good assimilation effect.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by changes, modifications, substitutions, combinations, simplifications,
Equivalent substitute mode is should be, is included within the scope of the present invention.
Claims (5)
1. adjustable magnetron cathode cable microwave leakage protective device, which is characterized in that it is circular sleeve to have cross section
One (1)；Sleeve two (4) be mounted on sleeve one (1) end and by screw thread realize position it is adjustable, sleeve two (4) be nested with
On the inner wire (3) of ceramic insulation cylinder (6)；Inner wire (3) passes through ceramic insulation along sleeve one (1) and sleeve two (4) central axes
Cylinder (6) is connect with cathode cable；Joint face (2) is mounted on the beginning of sleeve one (1), and resistance is coated on sleeve one (1) inner surface
Film (5) is equipped with cooling fin on sleeve one (1) outer surface；Ceramic insulation cylinder (6) outer surface is coated with resistance film；Set
One (1) internal diameter D of cylinder is sufficiently large, to ensure enough resistance film surface areas；Two internal diameter d of sleeve is sufficiently small, to ensure two sections together
The characteristic impedance difference of axis is larger, increases the reflectance factor of junction；Control D:D is not less than 8；Sleeve one (1) end connects one
The prodigious coaxial transmission linear load of characteristic impedance difference.
2. adjustable magnetron cathode cable microwave leakage protective device according to claim 1, which is characterized in that described
Sleeve one (1) length is not equal to the integral multiple of half-wavelength.
3. adjustable magnetron cathode cable microwave leakage protective device according to claim 1, which is characterized in that described
Cooling fin is along the radially uniform distribution of sleeve one (1).
4. adjustable magnetron cathode cable microwave leakage protective device according to claim 1, which is characterized in that described
Joint face (2), sleeve one (1), sleeve two (4) and cooling fin are made of good conductor.
5. adjustable magnetron cathode cable microwave leakage protective device according to claim 4, which is characterized in that described
Good conductor is copper material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710004089.2A CN106683960B (en) | 2017-01-04 | 2017-01-04 | Adjustable magnetron cathode cable microwave leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710004089.2A CN106683960B (en) | 2017-01-04 | 2017-01-04 | Adjustable magnetron cathode cable microwave leakage protective device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106683960A CN106683960A (en) | 2017-05-17 |
| CN106683960B true CN106683960B (en) | 2018-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710004089.2A Expired - Fee Related CN106683960B (en) | 2017-01-04 | 2017-01-04 | Adjustable magnetron cathode cable microwave leakage protective device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61179031A (en) * | 1985-02-01 | 1986-08-11 | Hitachi Ltd | Device for preventing radio wave leakage of magnetron |
| CN1071289A (en) * | 1991-09-18 | 1993-04-21 | Eev有限公司 | The material of RF radiation absorbing |
| CN1518214A (en) * | 2003-01-16 | 2004-08-04 | ���ǵ�����ʽ���� | Noise filter for high-frequency generator |
| CN103354945A (en) * | 2011-02-11 | 2013-10-16 | E2V技术（英国）有限公司 | Filter for a magnetron power supply lead |
| CN106129567A (en) * | 2016-08-29 | 2016-11-16 | 成都赛纳微波科技有限公司 | End arranges the HIGH-POWERED MICROWAVES device of coaxial configuration |
-
2017
- 2017-01-04 CN CN201710004089.2A patent/CN106683960B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61179031A (en) * | 1985-02-01 | 1986-08-11 | Hitachi Ltd | Device for preventing radio wave leakage of magnetron |
| CN1071289A (en) * | 1991-09-18 | 1993-04-21 | Eev有限公司 | The material of RF radiation absorbing |
| US5691667A (en) * | 1991-09-18 | 1997-11-25 | English Electric Valve Co., Ltd. | RF radiation absorbing material disposed between the cathode and anode of an electron beam tube |
| CN1518214A (en) * | 2003-01-16 | 2004-08-04 | ���ǵ�����ʽ���� | Noise filter for high-frequency generator |
| CN103354945A (en) * | 2011-02-11 | 2013-10-16 | E2V技术（英国）有限公司 | Filter for a magnetron power supply lead |
| CN106129567A (en) * | 2016-08-29 | 2016-11-16 | 成都赛纳微波科技有限公司 | End arranges the HIGH-POWERED MICROWAVES device of coaxial configuration |
Non-Patent Citations (1)
| Title |
|---|
| 微波源机箱内线缆的电磁干扰仿真研究;周大瑜;《西南交通大学硕士学位论文》;20150501;第45-46页 * |
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| CN106683960A (en) | 2017-05-17 |
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Granted publication date: 20180731 Termination date: 20210104 |