CN102820193A - Cathode part structure of magnetron - Google Patents
Cathode part structure of magnetron Download PDFInfo
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- CN102820193A CN102820193A CN2011101501225A CN201110150122A CN102820193A CN 102820193 A CN102820193 A CN 102820193A CN 2011101501225 A CN2011101501225 A CN 2011101501225A CN 201110150122 A CN201110150122 A CN 201110150122A CN 102820193 A CN102820193 A CN 102820193A
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Abstract
Disclosed is a cathode part structure of a magnetron. The cathode part structure comprises a filament, a blade, a center guide rod and a side surface guide rod, a ceramic fixing member is arranged between an upper sealing component of the filament and an upper magnetic pole of the magnetron and fixed between the upper magnetic pole and the blade, and the upper sealing component of the filament and the ceramic fixing member are fixed with each other; and a cylindrical through hole penetrates through the ceramic fixing member, and the axis of the through hole is coaxial with the upper sealing component. The upper sealing component of the filament and the ceramic fixing member are mutually matched with each other to be fixed, and action space between the upper magnetic pole and the blade is used for achieving accurate positioning so that the filament is effectively fixed at the position of the center of the magnetron, the eccentric condition of the filament is avoided, the filament is difficult to shift even if the magnetron is crashed and knocked, filament eccentricity fault caused under the external force action is avoided, the dark current caused by eccentricity is minimized, and characteristic qualities of the magnetron are guaranteed.
Description
Technical field
The invention belongs to the technical field of magnetron, be specifically related to a kind of ceramic fixed body that the anchored filament upper seal is set between last magnetic pole and blade, thereby prevent that filament is eccentric, reduce the negative pole part structure of the magnetron of dark current.
Background technology
Fig. 1 is the magnetron structures longitudinal section of prior art; Fig. 2 is the cutaway view of the negative pole part structure of magnetron in the prior art; Fig. 3 is the sketch map of the cathode filament structure of magnetron in the prior art.
To shown in Figure 3, magnetron mainly includes: anode portion like Fig. 1; 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 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.
The position, lower seal chamber of corresponding lower magnetic pole is provided with ceramic component 31 in the lower end of magnetron, 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 through cathode terminal respectively; Surround the shielding box 34 that the filter coil setting is made up 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.
When magnetic pole 20 forms magnetic flux with lower magnetic pole 21 on the magnetic field that magnet 22 produces is passed through, between blade 12 and filament 13, form magnetic field.When switching on through 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 4.0 KV 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 through 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 from magnetron, leak.
The antenna side choke structure of magnetron comprises: the antenna seal cover 100 that is arranged at the anode casing top of magnetron and forms the top seal chamber is inner and form the tubular chokes wall 101 of choke groove 102 jointly with the antenna seal cover inwall with the airtight antenna seal cover that is welded in; The antenna exit on antenna seal cover top forms the chokes tube to top closed chamber inside bend, the same choke groove 102 that forms between chokes tube and the chokes wall, and chokes tube, antenna seal cover and chokes wall are coaxial.
The negative pole part structure of magnetron in the prior art; Comprise: filament 13; On the central axis direction of magnetron, form, have spiral-shaped and can radiate hot electron, columniform upper seal and lower seal are set respectively at the upper and lower side of filament by tungsten and thorium element; The upper seal position is corresponding to the through hole in the middle of the last magnetic pole of magnetron, and the lower seal position is corresponding to the lower magnetic pole of magnetron; Blade 12 is the radial anode casing inside that is arranged on around filament, between blade and filament, forms the action space 14 that makes the hot electron rotation; Shielding cap 15a is truncated conical shape, and upper surface is a plane, is arranged on the upper end of upper seal 15, forms by upper seal is protruding upward; Central authorities' guide rod 17 connects the lower seal 16 of magnetron and connects upper seal 15, and filament supports 13 also is filament introducing power supply, and its lower end is connected with cathode terminal 35 through bonding pad 37; Side guide rod 18, the lower seal 16 of connection magnetron cooperates to filament introducing power supply with central guide rod, and the lower end of side guide rod is connected with cathode terminal 35 through bonding pad 37; Ceramic component 31; Be arranged on lower seal chamber 42 downsides that surrounded by negative electrode capping 103; In the ceramic component upper end two non-touching bonding pads 37 that support central guide rod and side guide rod are set; Pass from ceramic component with two cathode terminals that bonding pad is connected respectively, and be connected with filter coil in the shielding box.
Not enough below but prior art exists:
In the negative pole part structure of the prior art of magnetron; Action space is passed on the top of the cathode filament of magnetron; The position is corresponding to the last magnetic pole of magnetron; Filament does not obtain effectively fixing, and colliding with, being out of shape of in the production of magnetron and transportation, taking place all can cause the filament position that off-centre takes place easily, thereby brings the dark current of adverse effect for magnetron.Need carry out the off-centre correction in later stage to filament for fear of the generation of the eccentric situation of filament in the prior art, cause the workload in the magnetron production to increase.
Summary of the invention
The present invention provides a kind of ceramic fixed body that the anchored filament upper seal is set for solving the technical problem that exists in the prior art between last magnetic pole and blade, thereby prevents that filament is eccentric, reduces the negative pole part structure of the magnetron of dark current.
The technical scheme that the present invention takes for the technical problem that exists in the solution prior art is:
The negative pole part structure of magnetron of the present invention; Comprise: filament on the central axis direction of magnetron, is formed by tungsten and thorium element; Have spiral-shaped and can radiate hot electron; Upper and lower side at filament is provided with upper seal and lower seal respectively, and the upper seal position is corresponding to the through hole in the middle of the last magnetic pole of magnetron, and the lower seal position is corresponding to the lower magnetic pole of magnetron; Blade is the radial anode casing inside that is arranged on around filament, between blade and filament, forms the action space that makes the hot electron rotation; Central authorities' guide rod connects the lower seal of magnetron and connects upper seal, and filament supports also is filament introducing power supply, and its lower end is connected with cathode terminal through bonding pad; The side guide rod; The lower seal that connects magnetron; Cooperate with central guide rod to filament and introduce power supply, the lower end of side guide rod is connected with cathode terminal through bonding pad, between the magnetic pole ceramic fixed body is being set on the upper seal of filament and the magnetron; The pottery fixed body is fixed between magnetic pole and the blade, and the upper seal of filament and ceramic fixed body interfix; Run through ceramic fixed body cylindrical hole is set, the axis of through hole is coaxial with the upper seal of filament.
The present invention can also adopt following technical measures:
The upper end of described ceramic fixed body forms the top round platform of protrusion, and the diameter of top round platform is identical with the diameter of last magnetic pole intermediate throughholes, and top round platform and last magnetic pole cooperatively interact fixing.
The lower end of described ceramic fixed body forms the bottom round platform of protrusion, and the diameter of bottom round platform is identical with the diameter of action space, and bottom round platform and action space cooperatively interact fixing.
The body diameter at described ceramic fixed body middle part is greater than above-mentioned top round platform diameter and bottom round platform diameter.
The bottom of described ceramic fixed body is provided with the upper seal mating recess of shape size and filament, and upper seal cooperatively interacts fixing through groove and ceramic fixed body, and the through hole that runs through ceramic fixed body is arranged in the groove.
Advantage and good effect that the present invention has are:
In the negative pole part structure of magnetron of the present invention; Between magnetic pole on the magnetron and blade, fixedly install ceramic fixed body; And make the upper seal of filament and ceramic fixed body cooperatively interact fixing; Action space through in the middle of last magnetic pole and the blade is accurately located, and filament is fixed on the position at magnetron center effectively, avoids filament that eccentric situation takes place.Even if magnetron is collided and collides with, filament also is not easy to be shifted, and has avoided filament that eccentric fault takes place under external force, will minimize because of the eccentric dark current that takes place, and has guaranteed the characteristic quality of magnetron.Also reduced in addition the eccentric correction work of being carried out of filament, reduced the bad possibility of off-centre correction of filament, improved the production efficiency in the magnetron production process.
Description of drawings
Fig. 1 is the magnetron structures longitudinal section of prior art;
Fig. 2 is the cutaway view of the negative pole part structure of magnetron in the prior art;
Fig. 3 is the sketch map of the cathode filament structure of magnetron in the prior art;
Fig. 4 is the sketch map of the negative pole part structure of magnetron of the present invention;
Fig. 5 is the cutaway view of ceramic fixed body in the negative pole part structure of magnetron of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed explanation.
Fig. 4 is the sketch map of the negative pole part structure of magnetron of the present invention; Fig. 5 is the cutaway view of ceramic fixed body in the negative pole part structure of magnetron of the present invention.
Like Fig. 4, shown in Figure 5, the negative pole part structure of magnetron of the present invention comprises: filament 13; On the central axis direction of magnetron; Form by tungsten and thorium element, have spiral-shaped and can radiate hot electron, upper seal 15 and lower seal 16 are set respectively at the upper and lower side of filament; Upper seal 15 positions are corresponding to the through hole in the middle of the last magnetic pole 20 of magnetron, and lower seal 16 positions are corresponding to the lower magnetic pole 21 of magnetron; Blade 12 is radial anode casing 11 inside that are arranged on around filament, between blade 12 and filament 13, forms the action space that makes the hot electron rotation; Central authorities' guide rod 17 connects the lower seal 16 of magnetron and connects upper seal 15, and filament supports 13 also is filament introducing power supply, and its lower end is connected with cathode terminal through bonding pad; Side guide rod 18; The lower seal 16 that connects magnetron; Cooperate with central guide rod 17 to filament 13 and introduce power supplys, the lower end of side guide rod 18 is connected with cathode terminal through bonding pad, between the magnetic pole ceramic fixed body is being set on the upper seal of filament and the magnetron; Pottery fixed body 23 is fixed between magnetic pole 20 and the blade 12, and the upper seal 15 of filament interfixes with ceramic fixed body 23; Run through ceramic fixed body cylindrical hole 27 is set, the axis of through hole is coaxial with the upper seal 15 of filament 13.
The upper end of pottery fixed body 23 forms the top round platform 24 of protrusion, and the diameter of top round platform 24 is identical with the diameter of last magnetic pole 20 intermediate throughholes, and top round platform and last magnetic pole cooperatively interact fixing.
The lower end of pottery fixed body 23 forms the bottom round platform 25 of protrusion, and the diameter of bottom round platform 25 is identical with the diameter of action space 14, and bottom round platform and action space cooperatively interact fixing.
The bottom of pottery fixed body is provided with the upper seal mating recess 28 of shape size and filament, and upper seal 15 cooperatively interacts fixing through groove 28 and ceramic fixed body 23, and the through hole that runs through ceramic fixed body is arranged in the groove.
In the negative pole part structure of magnetron of the present invention; Between magnetic pole on the magnetron and blade, fixedly install ceramic fixed body; And make the upper seal of filament and ceramic fixed body cooperatively interact fixing; Action space through in the middle of last magnetic pole and the blade is accurately located, and filament is fixed on the position at magnetron center effectively, avoids filament that eccentric situation takes place.Even if magnetron is collided and collides with, filament also is not easy to be shifted, and has avoided filament that eccentric fault takes place under external force, will minimize because of the eccentric dark current that takes place, and has guaranteed the characteristic quality of magnetron.Also reduced in addition the eccentric correction work of being carried out of filament, reduced the bad possibility of off-centre correction of filament, improved the production efficiency in the magnetron production process.
The above only is preferred embodiment of the present invention, is not the present invention is done any pro forma restriction; Though the present invention is with preferred embodiment openly as above, yet, be not in order to limit the present invention; Anyly be familiar with the professional and technical personnel, in not breaking away from technical scheme scope of the present invention, can utilize the technology contents of announcement to make a little change or modification certainly; Become the equivalent embodiment of equivalent variations; In every case be the content that does not break away from technical scheme of the present invention, to any simple modification, equivalent variations and modification that above embodiment did, all belong in the scope of technical scheme of the present invention according to technical spirit of the present invention.
Claims (5)
1. the negative pole part structure of a magnetron; Comprise: filament on the central axis direction of magnetron, is formed by tungsten and thorium element; Have spiral-shaped and can radiate hot electron; Upper and lower side at filament is provided with upper seal and lower seal respectively, and the upper seal position is corresponding to the through hole in the middle of the last magnetic pole of magnetron, and the lower seal position is corresponding to the lower magnetic pole of magnetron; Blade is the radial anode casing inside that is arranged on around filament, between blade and filament, forms the action space that makes the hot electron rotation; Central authorities' guide rod connects the lower seal of magnetron and connects upper seal, and filament supports also is filament introducing power supply, and its lower end is connected with cathode terminal through bonding pad; The side guide rod; The lower seal that connects magnetron; Cooperate with central guide rod to filament and introduce power supply, the lower end of side guide rod is connected with cathode terminal through bonding pad, it is characterized in that: between the magnetic pole ceramic fixed body is being set on the upper seal of filament and the magnetron; The pottery fixed body is fixed between magnetic pole and the blade, and the upper seal of filament and ceramic fixed body interfix; Run through ceramic fixed body cylindrical hole is set, the axis of through hole is coaxial with the upper seal of filament.
2. the negative pole part structure of magnetron according to claim 1 is characterized in that: the upper end of ceramic fixed body forms the top round platform of protrusion, and the diameter of top round platform is identical with the diameter of last magnetic pole intermediate throughholes, and top round platform and last magnetic pole cooperatively interact fixing.
3. the negative pole part structure of magnetron according to claim 2 is characterized in that: the lower end of ceramic fixed body forms the bottom round platform of protrusion, and the diameter of bottom round platform is identical with the diameter of action space, and bottom round platform and action space cooperatively interact fixing.
4. the negative pole part structure of magnetron according to claim 3 is characterized in that: the body diameter at ceramic fixed body middle part is greater than above-mentioned top round platform diameter and bottom round platform diameter.
5. the negative pole part structure of magnetron according to claim 4; It is characterized in that: the bottom of ceramic fixed body is provided with the upper seal mating recess of shape size and filament; Upper seal cooperatively interacts fixing through groove and ceramic fixed body, the through hole that runs through ceramic fixed body is arranged in the groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110150122.5A CN102820193B (en) | 2011-06-07 | 2011-06-07 | The negative pole part structure of magnetron |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110150122.5A CN102820193B (en) | 2011-06-07 | 2011-06-07 | The negative pole part structure of magnetron |
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| CN102820193A true CN102820193A (en) | 2012-12-12 |
| CN102820193B CN102820193B (en) | 2016-03-02 |
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| CN201110150122.5A Active CN102820193B (en) | 2011-06-07 | 2011-06-07 | The negative pole part structure of magnetron |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4494034A (en) * | 1982-12-09 | 1985-01-15 | Rca Corporation | Magnetron filament having a quadrilateral cross-section |
| CN1162832A (en) * | 1996-04-17 | 1997-10-22 | 三星电子株式会社 | Cathode assembly of magnetron |
| CN1992134A (en) * | 2005-12-27 | 2007-07-04 | Lg电子株式会社 | Magnetron |
| CN101047095A (en) * | 2006-03-27 | 2007-10-03 | 松下电器产业株式会社 | Magnetron |
| CN101640156A (en) * | 2008-08-01 | 2010-02-03 | 乐金电子(天津)电器有限公司 | Choke structure of magnetron |
-
2011
- 2011-06-07 CN CN201110150122.5A patent/CN102820193B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4494034A (en) * | 1982-12-09 | 1985-01-15 | Rca Corporation | Magnetron filament having a quadrilateral cross-section |
| CN1162832A (en) * | 1996-04-17 | 1997-10-22 | 三星电子株式会社 | Cathode assembly of magnetron |
| CN1992134A (en) * | 2005-12-27 | 2007-07-04 | Lg电子株式会社 | Magnetron |
| CN101047095A (en) * | 2006-03-27 | 2007-10-03 | 松下电器产业株式会社 | Magnetron |
| CN101640156A (en) * | 2008-08-01 | 2010-02-03 | 乐金电子(天津)电器有限公司 | Choke structure of magnetron |
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| CN102820193B (en) | 2016-03-02 |
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