CN102238765A - Antenna cap of magnetron - Google Patents
Antenna cap of magnetron Download PDFInfo
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- CN102238765A CN102238765A CN2010101627820A CN201010162782A CN102238765A CN 102238765 A CN102238765 A CN 102238765A CN 2010101627820 A CN2010101627820 A CN 2010101627820A CN 201010162782 A CN201010162782 A CN 201010162782A CN 102238765 A CN102238765 A CN 102238765A
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- antenna cap
- magnetron
- wall
- antenna
- chokes
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Abstract
The invention provides an antenna cap of a magnetron. The antenna cap is of a hollow cylindrical structure, fixed to an exhaust pipe, arranged at the upper part of the magnetron, and surrounds and protects an antenna which is led out from a sealed chamber arranged at the upper part of the magnetron. A through hole is arranged at the middle position of the upper wall of the antenna cap; a choke wall which is raised downwards surrounds the through hole on the inner side of the upper wall of the antenna cap; and a choke groove is formed between the choke wall and the inner wall of the antenna cap. According to a transmission line theory, the sparking phenomenon caused by unstable high order modes or overlarge modulating pulse wave fronts which are excited by too fast pulse rise velocity can be restrained effectively. The size of the chock wall is regulated to overcome the undesirable phenomenon of magnetron sparking resulted from output end impedance mismatching and unsmooth power output.
Description
Technical field
The invention belongs to the technical field of magnetron, be specifically related to a kind of chokes wall and choke groove of being provided with in inside, thus the high-frequency harmonic that suppresses the basic wave integer frequency from antenna leak,, avoid the antenna cap of the magnetron that spark phenomenon takes place.
Background technology
Fig. 1 is the magnetron structures longitudinal section of prior art; Fig. 2 is the cutaway view of the antenna cap of magnetron in the prior art.
As shown in Figure 1 and Figure 2, magnetron mainly includes: anode portion; Negative pole part; Magnetic pole piece; The microwave emission part.
Anode portion is formed with a plurality of radial blades 12 by the anode casing 11 of drum shape on the inwall of anode casing 11, welding inner and outer ring formation in the lower groove on the blade.
Negative pole part is included on the central shaft by form spiral-shaped of W (tungsten) and TH (thorium) element and can radiates thermionic filament 13; Between the end of blade 12 and filament 13, form the action space 14 that makes the hot electron rotation; In order to prevent to break away from from the central shaft above-below direction, form upper seal 15 and lower seal 16 in the top and bottom of filament 13 from the hot electron that filament 13 radiation are come out; For filament supports 13 and introduce power supply, designed the filament central authorities guide rod 17 that connects lower seal 16 and connect upper seal 15 and introduced power supply with central guide rod 17 and be connected the side guide rod 18 of lower seal 16.
Magnetic pole piece comprises the top and bottom that are fixed on anode casing 11 and can form the last magnetic pole 20 of magnetic flux, lower magnetic pole 21; To form magnetic field in order making on the action space 14, magnet 22 to be installed in the upper end of last magnetic pole 20 and the lower end of lower magnetic pole 21.
On the top of last magnetic pole 20 and the bottom of lower magnetic pole 21 the top seal chamber 41 and the lower seal chamber 42 of playing flux interaction is set, top seal chamber and lower seal chamber are formed by the space that antenna seal cover 100 and negative electrode capping 103 are separated out respectively; For the high frequency waves in 14 li generations of action space are transmitted into the outside, are provided with and are connected the antenna 51 that blade 12 and the last magnetic pole 20 of perforation and top seal chamber 41 central authorities extract; To produce and pass through the heat that blade 12 transmits for 14 li in order cooling off, to be provided with cooling fin 61 at action space.
Position, lower seal chamber at the corresponding lower magnetic pole in the lower end of magnetron is provided with ceramic component 31, and ceramic component is combined closely with the negative electrode capping that forms the lower seal chamber; Two cathode terminals 35 that pass ceramic component are set in ceramic component 31,32, the two sections filter coils of filter coil with filter function are set in addition connect central guide rod 17 1 ends of filament and an end of side guide rod 18 by cathode terminal respectively; Surround the shielding box 34 that the filter coil setting is made of metal material, the airtight space of the inner formation of shielding box, through hole 36 is formed at shielding box top, the lower end of ceramic component is passed the through hole on shielding box top and is fixed with shielding box, connect filter coil 32, and the capacitor 33 of power supply is introduced in cross-over connection in both ends of power from the outside.
Go back the parts such as shell 19 that 61 protections of handlebar cooling fin shed at heat inner and that cooling fin 61 is transmitted in addition.Shell 19 comprises from upside and holds the upper casing 19a of interior arrangement and hold the lower casing 19b of interior arrangement from downside.
The following describes aforesaid magnetron working condition.When magnetic pole 20 and lower magnetic pole 21 form magnetic flux on the magnetic field that magnet 22 produces is passed through, between blade 12 and filament 13, form magnetic field.When switching on by capacitor 33, filament 13 is approximately radiating hot electron under the 2000K temperature, and hot electron is rotated to 4.4KV and the action space 14 under the effect in the magnetic field that magnet 22 produces at the 4.0KV between filament 13 and the anode portion.
Like this, passing through central guide rod 17 and side guide rod 18 in filament 13 energisings, at the electric field that produces between blade 12 and the filament 13 about 2450MHZ, make hot electron in action space 14, become harmonic wave under the effect by electric field and magnetic field, and the antenna 51 that makes harmonic wave be delivered to connection blade 12 is transmitted into the outside.
The basic wave that not only is useful on the cooking (2450MHZ) in the action space generation, also have the high-frequency harmonic of basic wave frequency integral multiple, mainly comprise second high-frequency harmonic (4900MHZ), the 3rd high-frequency harmonic (7350MHZ), the 4th high-frequency harmonic (9.8GHZ), the 5th high-frequency harmonic (12.5GHZ) etc.Basic wave is used for the heating of the article in the microwave oven, and the integral multiple high-frequency harmonic causes strong electromagnetic interference to electric elements on every side easily, and harmful, therefore must reduce high-frequency harmonic as far as possible and leak from magnetron.
The antenna cap of magnetron in the prior art is the cylinder-like structure of hollow, fixes with blast pipe, is arranged on the top of magnetron, the antenna that encirclement and protection are drawn from the top seal chamber, and the centre position of antenna cap upper wall is provided with through hole.
But prior art has the following disadvantages:
The antenna cap of the prior art of magnetron is the tubular structure of metal material; the effect of antenna cap only is in order to protect the antenna of magnetron; the various clutters produced simultaneously that can't suppress to exhale from the feeder place with basic wave; cause impedance of magnetron output and high frequency load not to match easily, thereby cause the sparking of magnetron.High-frequency harmonic leaks into space outerpace easily, thereby electric elements and human body are produced adverse influence.
Summary of the invention
The present invention provides a kind of chokes wall and choke groove of being provided with in inside for solving the technical problem that exists in the prior art, thus the high-frequency harmonic that suppresses the basic wave integer frequency from antenna leak,, avoid the antenna cap of the magnetron that spark phenomenon takes place.
The technical scheme that the present invention takes for the technical problem that exists in the solution prior art is:
The antenna cap of magnetron of the present invention; cylinder-like structure for hollow; fix with blast pipe; be arranged on the top of magnetron; surround and protect the antenna of drawing from the top seal chamber; the centre position of antenna cap upper wall is provided with through hole, at the inboard lead to the hole site that centers on of antenna cap upper wall outstanding chokes wall is set downwards, forms choke groove between chokes wall and antenna cap inwall.
The present invention can also adopt following technical measures:
Fit tightly between described chokes wall and the antenna cap upper wall inboard and be connected, do not stay the slit between the two.
Described chokes wall adopts cylinder-like structure, and chokes wall and antenna cap are coaxial.
The antenna cap of magnetron of the present invention; cylinder-like structure for hollow; fix with blast pipe; be arranged on the top of magnetron; the antenna that encirclement and protection are drawn from the top seal chamber, the antenna cap upper wall is provided with opening and is bent to form the chokes wall along opening part to the inner space of antenna cap direction, forms choke groove between chokes wall and antenna cap inwall; have the catch of through hole in antenna cap upper end outer setting, the hole covering that catch and antenna cap are fixing after antenna cap is bent inwards.
Fit tightly between described catch and the antenna cap upper wall outside and be connected, do not stay the slit between the two.
Described chokes wall adopts cylinder-like structure, and chokes wall and antenna cap are coaxial.
Advantage and good effect that the present invention has are:
In the antenna cap of magnetron of the present invention; at the columnar chokes wall of the inner increase of antenna cap; form choke groove between chokes wall and antenna cap inwall; according to transmission line theory, effectively suppress too fast, encouraged unsettled higher mode or the excessive spark phenomenon that causes of modulating pulse wave point owing to the pulse rate of climb.By adjusting the size of chokes wall, can further improve the output impedance and not match, power output does not freely cause the bad phenomenon of the sparking of magnetron.According to the anti-resistance of quarter-wave principle, be that microwave signal is when coaxial direction is transmitted, characteristic impedance apart from short circuit face quarter-wave strong point is theoretical infinitely great, microwave is with total reflection, the high-frequency harmonic that major part enters into the basic wave integral multiple between chokes tube and the chokes wall especially the 5th high-frequency harmonic reflects in the prominence of choke groove outlet easily, can not disperse easily, continue oscillatory extinction in the choke groove thereby stay, until being converted into heat.Therefore, reduced the divergence of the high-frequency harmonic of basic wave integral multiple, reduced high-frequency harmonic the adverse effect of human body and electric elements on every side to the external world.
Description of drawings
Fig. 1 is the magnetron structures longitudinal section of prior art;
Fig. 2 is the cutaway view of the antenna cap of magnetron in the prior art;
Fig. 3 is the cutaway view of the antenna cap of magnetron of the present invention;
Fig. 4 is the installation cutaway view of the antenna cap of magnetron of the present invention.
Embodiment
The present invention will be described in detail below in conjunction with drawings and Examples.
Fig. 3 is the cutaway view of the antenna cap of magnetron of the present invention; Fig. 4 is the installation cutaway view of the antenna cap of magnetron of the present invention.
As shown in Figure 3, Figure 4; the antenna cap 100 of magnetron of the present invention; cylinder-like structure for hollow; fix with blast pipe 60; be arranged on the top of magnetron, the antenna 51 that encirclement and protection are drawn from the top seal chamber, the centre position of antenna cap upper wall is provided with through hole; at the inboard lead to the hole site that centers on of antenna cap upper wall outstanding chokes wall 101 is set downwards, between chokes wall and antenna cap inwall, forms choke groove 102.
The chokes wall 101 same copper materials that adopt, the diameter of cylinder is drawn the diameter at feeder line place greater than antenna and less than the antenna cap diameter, the welding fixed edge is left on top, use argent that the chokes wall is welded in the antenna cap volume inside by the welding fixed edge, the weld of chokes wall and antenna cap inwall adopts tight welding not stay the slit, guarantees that high-frequency harmonic can not leak from both binding sites.Leave distance between chokes wall and the antenna cap inwall, form choke groove therebetween, the cross section of choke groove all is circular.
The antenna cap of magnetron of the present invention; cylinder-like structure for hollow; fix with blast pipe; be arranged on the top of magnetron; the antenna that encirclement and protection are drawn from the top seal chamber, the antenna cap upper wall is provided with opening and is bent to form the chokes wall along opening part to the inner space of antenna cap direction, forms choke groove between chokes wall and antenna cap inwall; have the catch of through hole in antenna cap upper end outer setting, the hole covering that catch and antenna cap are fixing after antenna cap is bent inwards.The chokes wall also is processed into cylinder-like structure, and chokes wall and antenna cap are coaxial.
Directly be bent to form the chokes wall by the antenna cap upper wall to antenna cap inside, eliminated the possibility that gaps owing to the welding procedure defective between chokes wall and antenna cap, can guarantee the sealing effectiveness of the choke groove that forms between chokes wall and the antenna cap inwall, prevent that microwave from leaking in choke groove.
Fit tightly welding between the catch and the antenna cap upper wall outside, do not stay the slit between the two.
When magnetron is worked,, make hot electron in action space, involve the high-frequency harmonic of its integer multiple frequency substantially by the microwave that produces 2450MHZ under the effect in electric field and magnetic field at the electric field that produces between blade and the filament about 2450MHZ.Harmonic wave enters into the top seal chamber from action space, it is strong more that the harmonic wave that frequency is high is more dispersed ability, will be away from the residing middle shaft position of antenna more, therefore mainly compile basic wave at the microwave antenna place, compiling second, third high-frequency harmonic according to center antenna position far away slightly, compiling the 4th, the 5th high-frequency harmonic in the position of relatively approaching the antenna seal cover inwall away from antenna.Microwave is dispersed by the outer transmission of sky alignment magnetron, when high-frequency harmonic that leaks out from antenna seal cover and various clutter enter into antenna cap, high-frequency harmonic and clutter enter in the choke groove that forms between chokes wall and antenna cap inwall, high-frequency harmonic can directly not exhale from choke groove smoothly, but enter choke groove inside once more via reflection at this, again at choke groove relaying persistent oscillation, and in choke groove, cancel out each other or decay and be converted into heat energy, and the radiating component by magnetic hole pipe is heat release, thereby also reduced high-frequency harmonic exhales magnetron with basic wave total amount.
In the antenna cap of magnetron of the present invention; at the columnar chokes wall of the inner increase of antenna cap; form choke groove between chokes wall and antenna cap inwall; according to transmission line theory, effectively suppress too fast, encouraged unsettled higher mode or the excessive spark phenomenon that causes of modulating pulse wave point owing to the pulse rate of climb.By adjusting the size of chokes wall, can further improve the output impedance and not match, power output does not freely cause the bad phenomenon of the sparking of magnetron.According to the anti-resistance of quarter-wave principle, be that microwave signal is when coaxial direction is transmitted, characteristic impedance apart from short circuit face quarter-wave strong point is theoretical infinitely great, microwave is with total reflection, the high-frequency harmonic that major part enters into the basic wave integral multiple between chokes tube and the chokes wall especially the 5th high-frequency harmonic reflects in the prominence of choke groove outlet easily, can not disperse easily, continue oscillatory extinction in the choke groove thereby stay, until being converted into heat.Therefore, reduced the divergence of the high-frequency harmonic of basic wave integral multiple, reduced high-frequency harmonic the adverse effect of human body and electric elements on every side to the external world.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention with preferred embodiment openly as above, yet, be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, certainly can utilize the technology contents of announcement to make a little change or modification, become the equivalent embodiment of equivalent variations, be the content that does not break away from technical solution of the present invention in every case, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all belong in the scope of technical solution of the present invention.
Claims (6)
1. the antenna cap of a magnetron; cylinder-like structure for hollow; fix with blast pipe; be arranged on the top of magnetron; surround and protect the antenna of drawing from the top seal chamber; the centre position of antenna cap upper wall is provided with through hole, it is characterized in that: at the inboard lead to the hole site that centers on of antenna cap upper wall outstanding chokes wall is set downwards, forms choke groove between chokes wall and antenna cap inwall.
2. the antenna cap of magnetron according to claim 1 is characterized in that: fit tightly between chokes wall and the antenna cap upper wall inboard and be connected, do not stay the slit between the two.
3. the antenna cap of magnetron according to claim 2 is characterized in that: the chokes wall adopts cylinder-like structure, and chokes wall and antenna cap are coaxial.
4. the antenna cap of a magnetron; cylinder-like structure for hollow; fix with blast pipe; be arranged on the top of magnetron; the antenna that encirclement and protection are drawn from the top seal chamber, it is characterized in that: the antenna cap upper wall is provided with opening and is bent to form the chokes wall along opening part to the inner space of antenna cap direction, forms choke groove between chokes wall and antenna cap inwall; have the catch of through hole in antenna cap upper end outer setting, the hole covering that catch and antenna cap are fixing after antenna cap is bent inwards.
5. the antenna cap of magnetron according to claim 4 is characterized in that: fit tightly between catch and the antenna cap upper wall outside and be connected, do not stay the slit between the two.
6. the antenna cap of magnetron according to claim 5 is characterized in that: the chokes wall adopts cylinder-like structure, and chokes wall and antenna cap are coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101627820A CN102238765A (en) | 2010-05-05 | 2010-05-05 | Antenna cap of magnetron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101627820A CN102238765A (en) | 2010-05-05 | 2010-05-05 | Antenna cap of magnetron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102238765A true CN102238765A (en) | 2011-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101627820A Pending CN102238765A (en) | 2010-05-05 | 2010-05-05 | Antenna cap of magnetron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102238765A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108780725A (en) * | 2016-03-25 | 2018-11-09 | 东芝北斗电子株式会社 | Magnetron |
| CN111045535A (en) * | 2018-09-26 | 2020-04-21 | 苹果公司 | Computer stylus with integrated antenna structure |
| CN113300088A (en) * | 2021-04-25 | 2021-08-24 | 北京合众思壮科技股份有限公司 | Planar helical antenna device |
-
2010
- 2010-05-05 CN CN2010101627820A patent/CN102238765A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108780725A (en) * | 2016-03-25 | 2018-11-09 | 东芝北斗电子株式会社 | Magnetron |
| CN111045535A (en) * | 2018-09-26 | 2020-04-21 | 苹果公司 | Computer stylus with integrated antenna structure |
| CN111045535B (en) * | 2018-09-26 | 2023-08-01 | 苹果公司 | Computer stylus with integrated antenna structure |
| CN113300088A (en) * | 2021-04-25 | 2021-08-24 | 北京合众思壮科技股份有限公司 | Planar helical antenna device |
| CN113300088B (en) * | 2021-04-25 | 2024-05-28 | 北京合众思壮科技股份有限公司 | Planar helical antenna device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111109 |