CN102820193B - The negative pole part structure of magnetron - Google Patents
The negative pole part structure of magnetron Download PDFInfo
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- CN102820193B CN102820193B CN201110150122.5A CN201110150122A CN102820193B CN 102820193 B CN102820193 B CN 102820193B CN 201110150122 A CN201110150122 A CN 201110150122A CN 102820193 B CN102820193 B CN 102820193B
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Abstract
A kind of negative pole part structure of magnetron, comprise: filament, blade, central guide rod, side guide rod, between the upper seal and the upper magnetic pole of magnetron of filament, ceramic fixed body is set, pottery fixed body is fixed between magnetic pole and blade, and the upper seal of filament and ceramic fixed body interfix; Run through ceramic fixed body and arrange cylindrical hole, the axis of through hole is coaxial with the upper seal of filament.Upper seal and the ceramic fixed body of filament cooperatively interact fixing, accurately located, filament is fixed on the position of magnetron center effectively by the action space in the middle of upper magnetic pole and blade, avoid filament that eccentric situation occurs.Even if magnetron is collided and collides with, filament is also less likely to occur displacement, avoids filament and eccentric fault occurs under external force, minimized by the dark current occurred, ensure that the characteristic quality of magnetron because of eccentric.
Description
Technical field
The invention belongs to the technical field of magnetron, be specifically related to a kind of ceramic fixed body that anchored filament upper seal is set between upper magnetic pole and blade, thus prevent filament 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 prior art; Fig. 3 is the schematic diagram of the cathode filament structure of magnetron in prior art.
As shown in Figure 1 to Figure 3, magnetron mainly includes: anode portion; Negative pole part; Magnetic pole piece; Microwave emission portion.
Anode portion, by the anode casing 11 of barrel shape, the inwall of anode casing 11 is formed with multiple radial blade 12, blade welds inner and outer ring in lower groove and forms.
Negative pole part comprises on center shaft by W(tungsten) and TH(thorium) formed spiral-shaped of element thermionic filament 13 can be radiated; The action space 14 that hot electron is rotated is formed between the end and filament 13 of blade 12; In order to prevent the hot electron radiating out from filament 13 from departing from from central shaft above-below direction, form upper seal 15 and lower seal 16 in the top and bottom of filament 13; In order to filament supports 13 and introduce power supply, devise through lower seal 16 and connect filament central authorities' guide rod 17 of upper seal 15 and introduce power supply and connect the side guide rod 18 of lower seal 16 together with central guide rod 17.
Magnetic pole piece comprises the top and bottom that are fixed on anode casing 11 and can form the upper magnetic pole 20 of magnetic flux, lower magnetic pole 21; In order to make that action space 14 forms magnetic field, in the lower end of the upper end of upper magnetic pole 20 and lower magnetic pole 21, magnet 22 is installed.
Arrange top seal room 41 and the lower seal room 42 of playing flux interaction in the bottom of the top of upper magnetic pole 20 and lower magnetic pole 21, the space that top seal room and lower seal room are separated out by antenna seal cover 100 and negative seal cover 103 is respectively formed; In order to the high frequency waves produced in action space 14 are transmitted into outside, be provided with and be connected to blade 12 and the antenna 51 that extracts of through upper magnetic pole 20 and top seal room 41 central authorities; Producing and the heat transmitted by blade 12 in action space 14 to cool, being provided with cooling fin 61.
In the lower end of magnetron, the position, lower seal room of corresponding lower magnetic pole arranges ceramic component 31, and ceramic component is combined closely with the negative seal cover forming lower seal room; Two cathode terminals 35 through ceramic component are set in ceramic component 31, filter coil 32, two sections of filter coils with filter function are set in addition and connect central guide rod 17 one end of filament and one end of side guide rod 18 respectively by cathode terminal; Surround filter coil and the shielding box 34 be made up of metal material is set, shielding box inside forms airtight space, 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 fixes with shielding box, connect filter coil 32, and be connected across both ends of power introduces power supply capacitor 33 from outside.
Go back handlebar cooling fin 61 in addition to protect in inside and the parts such as shell 19 grade that the heat that cooling fin 61 transmits is shed.Shell 19 comprises the upper casing 19a holding interior arrangement from upside and the lower casing 19b holding interior arrangement from downside.
Blast pipe 60 shown in figure is after magnetron assembling, in order to magnetron being become the part that vacuum state cuts off when being exhausted operation.
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.In time being energized by capacitor 33, filament 13 radiates hot electron at about 2000K temperature, and 4.0KV to the 4.4KV of hot electron between filament 13 and anode portion and the action space 14 under the effect in the magnetic field that magnet 22 produces rotate.
Like this, when being energized to filament 13 by central guide rod 17 and side guide rod 18, the electric field of about 2450MHZ is produced between blade 12 and filament 13, make hot electron by becoming harmonic wave under the effect of Electric and magnetic fields in action space 14, and make harmonic propagation be transmitted into outside to the antenna 51 connecting blade 12.
At the basic wave (2450MHZ) not only had for cooking that action space produces, also have the high-frequency harmonic of basic wave frequency integral multiple, mainly comprise the second high-frequency harmonic (4900MHZ), third high harmonic wave (7350MHZ), the 4th high-frequency harmonic (9.8GHZ), the 5th high-frequency harmonic (12.5GHZ) etc. frequently.Basic wave is used for the article heating in microwave oven, and integral multiple high-frequency harmonic easily causes strong electromagnetic interference to the electric elements of surrounding, and harmful, therefore must reduce high-frequency harmonic as far as possible and leak from magnetron.
The antenna side choke structure of magnetron, comprising: be arranged at magnetron anode casing top and form the antenna seal cover 100 of top seal room and the airtight antenna seal cover that is welded in inner and jointly form the tubular chokes wall 101 of choke groove 102 with antenna seal cover inwall; The antenna outlet place on antenna seal cover top is bent to form chokes cylinder inside the closed chamber of top, forms choke groove 102 equally between chokes cylinder with chokes wall, and chokes cylinder, antenna seal cover and chokes wall are coaxial.
The negative pole part structure of magnetron in prior art, comprise: filament 13, the central axis direction of magnetron is formed by tungsten and thorium element, have spiral-shaped and can hot electron be radiated, at the upper and lower side of filament, columniform upper seal and lower seal are set respectively, upper seal position corresponds to the through hole in the middle of the upper magnetic pole of magnetron, and lower seal position corresponds to the lower magnetic pole of magnetron; Blade 12, is radially arranged on anode casing inside around filament, forms the action space 14 that hot electron is rotated between blade and filament; Shielding cap 15a, be truncated conical shape, upper surface is a plane, is arranged on the upper end of upper seal 15, is formed by upper seal is protruding upward; Central authorities' guide rod 17, the lower seal 16 of through magnetron and connect upper seal 15, filament supports 13 be filament introducing power supply, its lower end is connected with cathode terminal 35 by bonding pad 37; Side guide rod 18, connect the lower seal 16 of magnetron, coordinate with central guide rod and introduce power supply to filament, the lower end of side guide rod is connected with cathode terminal 35 by bonding pad 37; Ceramic component 31, be arranged on the downside of the lower seal room 42 that surrounded by negative seal cover 103, two the non-touching bonding pads 37 supporting central guide rod and side guide rod are set in ceramic component upper end, two cathode terminals be connected respectively with bonding pad pass from ceramic component, and are connected with the filter coil in shielding box.
But prior art has the following disadvantages:
In the negative pole part structure of the prior art of magnetron, the top of the cathode filament of magnetron is through action space, position corresponds to the upper magnetic pole of magnetron, filament is not effectively fixed, what occur in the production and transportation of magnetron collides with, is out of shape that all easily to cause filament position to occur eccentric, thus brings the dark current of adverse effect for magnetron.Need in order to avoid the eccentric situation of filament in prior art run-out modification filament being carried out to the later stage, the workload in causing magnetron to produce increases.
Summary of the invention
The present invention provides a kind of ceramic fixed body arranging anchored filament upper seal between upper magnetic pole and blade for solving in prior art the technical problem that exists, thus prevents filament 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 existed in solution prior art is:
The negative pole part structure of magnetron of the present invention, comprise: filament, on the central axis direction of magnetron, formed by tungsten and thorium element, have spiral-shaped and can hot electron be radiated, arrange upper seal and lower seal respectively at the upper and lower side of filament, upper seal position corresponds to the through hole in the middle of the upper magnetic pole of magnetron, and lower seal position corresponds to the lower magnetic pole of magnetron; Blade, is radially arranged on anode casing inside around filament, forms the action space that hot electron is rotated between blade and filament; Central authorities' guide rod, the lower seal of through magnetron and connect upper seal, filament supports be filament introducing power supply, its lower end is connected with cathode terminal by bonding pad; Side guide rod, connect the lower seal of magnetron, coordinate with central guide rod and introduce power supply to filament, the lower end of side guide rod is connected with cathode terminal by bonding pad, between the upper seal and the upper magnetic pole of magnetron of filament, ceramic fixed body is set, pottery fixed body is fixed between magnetic pole and blade, and the upper seal of filament and ceramic fixed body interfix; Run through ceramic fixed body and arrange cylindrical hole, 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 protruded, and the diameter of top round platform is identical with the diameter of upper magnetic pole intermediate throughholes, and top round platform and upper magnetic pole cooperatively interact fixing.
The lower end of described ceramic fixed body forms the bottom round platform protruded, 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.
Body diameter in the middle part of described ceramic fixed body is greater than above-mentioned top round platform diameter and bottom round platform diameter.
The bottom of described ceramic fixed body arranges the groove that shape size mates mutually with the upper seal of filament, and upper seal cooperatively interacts fixing by groove and ceramic fixed body, and the through hole running through ceramic fixed body is arranged in groove.
The advantage that the present invention has and good effect are:
In the negative pole part structure of magnetron of the present invention, ceramic fixed body is fixedly installed between the upper magnetic pole and blade of magnetron, and make the upper seal of filament and ceramic fixed body cooperatively interact fixing, accurately located by the action space in the middle of upper magnetic pole and blade, filament is fixed on the position of magnetron center effectively, avoids filament that eccentric situation occurs.Even if magnetron is collided and collides with, filament is also less likely to occur displacement, avoids filament and eccentric fault occurs under external force, minimized by the dark current occurred, ensure that the characteristic quality of magnetron because of eccentric.Decrease the correction work that filament bias is carried out in addition, reduce the possibility that the run-out modification of filament is bad, improve the production efficiency in magnetron production process.
Accompanying drawing explanation
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 prior art;
Fig. 3 is the schematic diagram of the cathode filament structure of magnetron in prior art;
Fig. 4 is the schematic diagram 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 drawings and Examples, the present invention will be described in detail.
Fig. 4 is the schematic diagram 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.
As shown in Figure 4, Figure 5, the negative pole part structure of magnetron of the present invention, comprise: filament 13, on the central axis direction of magnetron, formed by tungsten and thorium element, have spiral-shaped and can hot electron be radiated, upper seal 15 and lower seal 16 are set respectively at the upper and lower side of filament, upper seal 15 position corresponds to the through hole in the middle of the upper magnetic pole 20 of magnetron, and lower seal 16 position corresponds to the lower magnetic pole 21 of magnetron; Blade 12, is radially arranged on anode casing 11 around filament inner, forms the action space that hot electron is rotated between blade 12 and filament 13; Central authorities' guide rod 17, the lower seal 16 of through magnetron and connect upper seal 15, filament supports 13 be filament introducing power supply, its lower end is connected with cathode terminal by bonding pad; Side guide rod 18, connect the lower seal 16 of magnetron, coordinate with central guide rod 17 and introduce power supply to filament 13, the lower end of side guide rod 18 is connected with cathode terminal by bonding pad, between the upper seal and the upper magnetic pole of magnetron of filament, ceramic fixed body is set, pottery fixed body 23 is fixed between magnetic pole 20 and blade 12, and the upper seal 15 of filament interfixes with ceramic fixed body 23; Run through ceramic fixed body and arrange cylindrical hole 27, 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 protruded, and the diameter of top round platform 24 is identical with the diameter of upper magnetic pole 20 intermediate throughholes, and top round platform and upper magnetic pole cooperatively interact fixing.
The lower end of pottery fixed body 23 forms the bottom round platform 25 protruded, 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.
Cylinder 26 diameter in the middle part of pottery fixed body 23 is greater than above-mentioned top round platform 24 diameter and bottom round platform 25 diameter, and ceramic fixed body 23 is stuck in the space between magnetic pole 20 and blade 12.
The bottom of pottery fixed body arranges the groove 28 that shape size mates mutually with the upper seal of filament, and upper seal 15 cooperatively interacts fixing by groove 28 and ceramic fixed body 23, and the through hole running through ceramic fixed body is arranged in groove.
In the negative pole part structure of magnetron of the present invention, ceramic fixed body is fixedly installed between the upper magnetic pole and blade of magnetron, and make the upper seal of filament and ceramic fixed body cooperatively interact fixing, accurately located by the action space in the middle of upper magnetic pole and blade, filament is fixed on the position of magnetron center effectively, avoids filament that eccentric situation occurs.Even if magnetron is collided and collides with, filament is also less likely to occur displacement, avoids filament and eccentric fault occurs under external force, minimized by the dark current occurred, ensure that the characteristic quality of magnetron because of eccentric.Decrease the correction work that filament bias is carried out in addition, reduce the possibility that the run-out modification of filament is bad, improve the production efficiency in magnetron production process.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention with preferred embodiment openly as above, but, and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, certainly the technology contents of announcement can be utilized to make a little change or modification, become the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all belong in the scope of technical solution of the present invention.
Claims (3)
1. the negative pole part structure of a magnetron, comprise: filament, on the central axis direction of magnetron, formed by tungsten and thorium element, have spiral-shaped and can hot electron be radiated, arrange upper seal and lower seal respectively at the upper and lower side of filament, upper seal position corresponds to the through hole in the middle of the upper magnetic pole of magnetron, and lower seal position corresponds to the lower magnetic pole of magnetron; Blade, is radially arranged on anode casing inside around filament, forms the action space that hot electron is rotated between blade and filament; Central authorities' guide rod, the lower seal of through magnetron and connect upper seal, filament supports be filament introducing power supply, its lower end is connected with cathode terminal by bonding pad; Side guide rod, connect the lower seal of magnetron, coordinate with central guide rod and introduce power supply to filament, the lower end of side guide rod is connected with cathode terminal by bonding pad, it is characterized in that: between the upper seal and the upper magnetic pole of magnetron of filament, ceramic fixed body is set, pottery fixed body is fixed between magnetic pole and blade, and the upper seal of filament and ceramic fixed body interfix; Run through ceramic fixed body and arrange cylindrical hole, the axis of through hole is coaxial with the upper seal of filament; The upper end of pottery fixed body forms the top round platform protruded, and the diameter of top round platform is identical with the diameter of upper magnetic pole intermediate throughholes, and top round platform and upper magnetic pole cooperatively interact fixing; The lower end of pottery fixed body forms the bottom round platform protruded, 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.
2. the negative pole part structure of magnetron according to claim 1, is characterized in that: the body diameter in the middle part of ceramic fixed body is greater than above-mentioned top round platform diameter and bottom round platform diameter.
3. the negative pole part structure of magnetron according to claim 2, is characterized in that:
The bottom of pottery fixed body arranges the groove that shape size mates mutually with the upper seal of filament, and upper seal cooperatively interacts fixing by groove and ceramic fixed body, and the through hole running through ceramic fixed body is arranged in 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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| CN201110150122.5A CN102820193B (en) | 2011-06-07 | 2011-06-07 | The negative pole part structure of magnetron |
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| CN102820193A CN102820193A (en) | 2012-12-12 |
| CN102820193B true CN102820193B (en) | 2016-03-02 |
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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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| CN102820193A (en) | 2012-12-12 |
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