CN104253005A - Exhaust pipe of magnetron for microwave oven - Google Patents
Exhaust pipe of magnetron for microwave oven Download PDFInfo
- Publication number
- CN104253005A CN104253005A CN201310260580.3A CN201310260580A CN104253005A CN 104253005 A CN104253005 A CN 104253005A CN 201310260580 A CN201310260580 A CN 201310260580A CN 104253005 A CN104253005 A CN 104253005A
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- magnetron
- microwave oven
- blast pipe
- pipe body
- length
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Abstract
The invention relates to an exhaust pipe of a magnetron for a microwave oven. The exhaust pipe comprises a tubular pipe body and a fixed wall extending outwardly from the outer portion of the pipe body and bending downwardly. The exhaust pipe is arranged at a ceramic ring above an antenna sealing cover of the magnetron; and the lower portion of the ceramic ring is fixedly with the antenna sealing cover. The top end of the pipe body is sealed after vacuum pumping; and the length of the sealed pipe body is reduced by 20 to 25%. The distance between the plane where the extending farthest position of the lower end of the fixed wall is located and the plane where the bottom end of the pipe body is located is reduced by 18 to 21%. The choke capability of the exhaust pipe on the third harmonic and the fourth harmonic can be improved by changing the retained length of the upper end of the pipe body and the length of the protruded fixed wall at the lower end of the pipe body; and the useless high-frequency harmonic wave generated by magnetron working can be suppressed correspondingly. On the premise that the characteristic of the magnetron is not changed, the electromagnetic compatible characteristic of the magnetron for the microwave oven is improved.
Description
Technical field
The invention belongs to the technical field of magnetron, being specifically related to a kind of when keeping magnetron characteristic not change, improving the blast pipe of the magnetron for microwave oven of magnetron electromagnetic compatibility characteristic.
Background technology
Fig. 1 is the magnetron structures longitudinal section of prior art; Fig. 2 is the structural representation of magnetron blast pipe position in prior art.
As shown in Figure 1 to Figure 2, magnetron mainly includes: positive electrode portion; Negative electrode portion; Magnetic pole piece; Microwave emission portion.Positive electrode portion, by the positive pole shell 11 of barrel shape, the inwall of positive pole shell 11 is formed with multiple radial blade 12, blade welds inner and outer ring in lower groove and forms.
Negative electrode portion 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 positive pole shell 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.
In addition, also have through ceramic component 31 and connect filament central authorities guide rod 17 one end and the filter coil 32 of filter function is carried out in side guide rod 18 one end; Connect filter coil 32, and be connected across both ends of power introduces power supply capacitor 33 from outside; Top seal room 41 and the lower seal room 42 of flux interaction are carried out in the bottom on the top and lower magnetic pole 21 that are formed in magnetic pole 20; 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; 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.
The following describes magnetron working condition as above.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 4.0 KV to the 4.4KVs of hot electron between filament 13 and positive electrode 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 seal cover of magnetron for microwave oven is surrounded by cover wall and is formed, and is arranged at the positive pole shell upper of magnetron, and forms top seal room in cover wall inside, and arrange antenna outlet on antenna seal cover top, antenna passes from antenna outlet.And the upper end of antenna seal cover passes from the upper casing of shell.For avoiding microwave from the slot leakage of combination between antenna seal cover and upper casing, need a nested gasket rings 101 in the upper end of antenna seal cover.
And the blast pipe 60 of magnetron for microwave oven of the prior art, the body 63 comprising tubular structure and the fixation wall 64 also bent downwards externally to extension by body, on ceramic ring 62 above the antenna seal cover that above-mentioned blast pipe is fixedly installed on magnetron, and the bottom of ceramic ring and antenna seal cover are fixed, the top of body seals after evacuation.In prior art, after sealing, the length of body is 9 millimeters, and fixation wall lower end extends to the place plane of farthest and the distance of body bottom between the plane of place is 2.6 millimeters.
Fig. 3 is that 6 δ of magnetron blast pipe in prior art manage schematic diagram.As shown in Figure 3, the Mean value when length of the magnetron blast pipe of prior art body is after sealing 9 millimeters in 6 δ management is 7.4, and manages Z value Zlt and be only 2.45.
But the blast pipe of the magnetron of prior art effectively cannot suppress the high-frequency harmonic of magnetron, part high-frequency harmonic can to outward leakage from exhaust structure, thus make the electromagnetic compatibility properties deteriorate of magnetron for microwave oven, thus the electric elements around human body and microwave oven are had a negative impact.
Summary of the invention
The present invention provides a kind of when keeping magnetron characteristic not change for solving in prior art the technical problem that exists, improves the blast pipe of the magnetron for microwave oven of magnetron electromagnetic compatibility characteristic.
The technical scheme that the present invention takes for the technical problem existed in solution prior art is:
The blast pipe of magnetron for microwave oven of the present invention, the body comprising tubular structure and the fixation wall also bent downward vertically externally to extension by body, on ceramic ring above the antenna seal cover that above-mentioned blast pipe is fixedly installed on magnetron, and the bottom of ceramic ring and antenna seal cover are fixed, the top of body seals after evacuation, it is characterized in that: after sealing, the length of body reduces 20-25%; Fixation wall lower end extends to the place plane of farthest and the distance of body bottom between the plane of place reduces 18-21%.
The present invention can also adopt following technical measures:
After described sealing, the length of body is 7 millimeters.
Described fixation wall lower end extends to the place plane of farthest and the distance of body bottom between the plane of place is 2.1 millimeters.
The advantage that the present invention has and good effect are:
In the blast pipe of magnetron for microwave oven of the present invention, the chokes ability of magnetron to triple-frequency harmonics is improve by the body upper end reservation length after sealing changing blast pipe, change by changing the body lower end length be inserted in ceramic ring the choke structure formed when blast pipe and ceramic ring interfix simultaneously, thus improve the rejection ability of magnetron to four-time harmonic, by the change to the two-end structure of blast pipe own, thus the choke structure defined for high-frequency harmonic, inhibit in magnetron work the useless high-frequency harmonic produced accordingly, under the prerequisite not causing magnetron characteristic variations, improve the electromagnetic compatibility characteristic of magnetron for microwave oven, so avoid the possibility of microwave leakage in exhaust structure, make magnetron more reliable, improve the nargin characteristic of magnetron, the adverse effect of high-frequency harmonic to surrounding body and electric elements is reduced when magnetron works.
Accompanying drawing explanation
Fig. 1 is the magnetron structures longitudinal section of prior art;
Fig. 2 is the structural representation of magnetron blast pipe position in prior art;
Fig. 3 is that 6 δ of magnetron blast pipe in prior art manage schematic diagram;
Fig. 4 is the schematic diagram of magnetron blast pipe of the present invention;
Fig. 5 is that 6 δ of magnetron blast pipe of the present invention manage schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be described in detail.
Fig. 4 is the schematic diagram of magnetron blast pipe of the present invention; Fig. 5 is that 6 δ of magnetron blast pipe of the present invention manage schematic diagram.
As shown in Figure 4, the blast pipe of magnetron for microwave oven of the present invention, the body 63 comprising tubular structure and the fixation wall 64 also bent downwards externally to extension by body, on ceramic ring 62 above the antenna seal cover that above-mentioned blast pipe 60 is fixedly installed on magnetron, and the bottom of ceramic ring and antenna seal cover 100 are fixed, the top of body seals after evacuation, the numerical value that fixation wall lower end extends in the place plane of farthest and the distance h hinge structure of body bottom between the plane of place reduces about 19%, and body upper end reservation distance H hinge structure after sealing decreases about 22% simultaneously.
After sealing, the length of body is 7 millimeters.As shown in Figure 5, the Mean value when length of magnetron blast pipe body is after sealing 7 millimeters in 6 δ management is 6.4, and manages Z value Zlt and be promoted to 3.3.
Fixation wall lower end extends to the place plane of farthest and the distance of body bottom between the plane of place is 2.1 millimeters.
In the blast pipe of magnetron for microwave oven of the present invention, the chokes ability of magnetron to triple-frequency harmonics is improve by the body upper end reservation length after sealing changing blast pipe, change by changing the body lower end length be inserted in ceramic ring the choke structure formed when blast pipe and ceramic ring interfix simultaneously, thus improve the rejection ability of magnetron to four-time harmonic, by the change to the two-end structure of blast pipe own, thus the choke structure defined for high-frequency harmonic, inhibit in magnetron work the useless high-frequency harmonic produced accordingly, under the prerequisite not causing magnetron characteristic variations, improve the electromagnetic compatibility characteristic of magnetron for microwave oven, so avoid the possibility of microwave leakage in exhaust structure, make magnetron more reliable, improve the nargin characteristic of magnetron.
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 blast pipe of a magnetron for microwave oven, the body comprising tubular structure and the fixation wall also bent downward vertically externally to extension by body, on ceramic ring above the antenna seal cover that above-mentioned blast pipe is fixedly installed on magnetron, and the bottom of ceramic ring and antenna seal cover are fixed, the top of body seals after evacuation, it is characterized in that: after sealing, the length of body reduces 20-25%; Fixation wall lower end extends to the place plane of farthest and the distance of body bottom between the plane of place reduces 18-21%.
2. the blast pipe of magnetron for microwave oven according to claim 1, is characterized in that: after sealing, the length of body is 7 millimeters.
3. the blast pipe of magnetron for microwave oven according to claim 1, is characterized in that: fixation wall lower end extends to the place plane of farthest and the distance of body bottom between the plane of place is 2.1 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260580.3A CN104253005B (en) | 2013-06-27 | 2013-06-27 | The blast pipe of magnetron for microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310260580.3A CN104253005B (en) | 2013-06-27 | 2013-06-27 | The blast pipe of magnetron for microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104253005A true CN104253005A (en) | 2014-12-31 |
| CN104253005B CN104253005B (en) | 2018-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201310260580.3A Active CN104253005B (en) | 2013-06-27 | 2013-06-27 | The blast pipe of magnetron for microwave oven |
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| CN (1) | CN104253005B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020039288A1 (en) * | 2018-08-22 | 2020-02-27 | 3M Innovative Properties Company | Fault circuit indicator apparatus, system, and method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129834A (en) * | 1977-01-17 | 1978-12-12 | U.S. Philips Corporation | Resonant cavity magnetron with choke structure for reducing harmonics in output system |
| US4459563A (en) * | 1980-04-30 | 1984-07-10 | Tokyo Shibaura Denki Kabushiki Kaisha | Magnetron unit with choke structure for reducing higher harmonics in microwave output |
| JPS60243938A (en) * | 1984-05-18 | 1985-12-03 | Hitachi Ltd | Magnetron |
| CN1201360A (en) * | 1997-05-31 | 1998-12-09 | Lg电子株式会社 | Design method for magnetron for electronic range |
| JP2003338250A (en) * | 2002-05-21 | 2003-11-28 | Matsushita Electric Ind Co Ltd | Magnetron |
| CN1591748A (en) * | 2003-08-26 | 2005-03-09 | 乐金电子(天津)电器有限公司 | Magnetron output device |
| CN101071717A (en) * | 2006-05-12 | 2007-11-14 | 乐金电子(天津)电器有限公司 | Magnetron with anti-current structure |
| JP2010080180A (en) * | 2008-09-25 | 2010-04-08 | Toshiba Hokuto Electronics Corp | Magnetron |
-
2013
- 2013-06-27 CN CN201310260580.3A patent/CN104253005B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129834A (en) * | 1977-01-17 | 1978-12-12 | U.S. Philips Corporation | Resonant cavity magnetron with choke structure for reducing harmonics in output system |
| US4459563A (en) * | 1980-04-30 | 1984-07-10 | Tokyo Shibaura Denki Kabushiki Kaisha | Magnetron unit with choke structure for reducing higher harmonics in microwave output |
| JPS60243938A (en) * | 1984-05-18 | 1985-12-03 | Hitachi Ltd | Magnetron |
| CN1201360A (en) * | 1997-05-31 | 1998-12-09 | Lg电子株式会社 | Design method for magnetron for electronic range |
| JP2003338250A (en) * | 2002-05-21 | 2003-11-28 | Matsushita Electric Ind Co Ltd | Magnetron |
| CN1591748A (en) * | 2003-08-26 | 2005-03-09 | 乐金电子(天津)电器有限公司 | Magnetron output device |
| CN101071717A (en) * | 2006-05-12 | 2007-11-14 | 乐金电子(天津)电器有限公司 | Magnetron with anti-current structure |
| JP2010080180A (en) * | 2008-09-25 | 2010-04-08 | Toshiba Hokuto Electronics Corp | Magnetron |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020039288A1 (en) * | 2018-08-22 | 2020-02-27 | 3M Innovative Properties Company | Fault circuit indicator apparatus, system, and method |
| US11327104B2 (en) | 2018-08-22 | 2022-05-10 | 3M Innovative Properties Company | Fault circuit indicator apparatus, system, and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104253005B (en) | 2018-01-12 |
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