CN104253005B - The blast pipe of magnetron for microwave oven - Google Patents
The blast pipe of magnetron for microwave oven Download PDFInfo
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- CN104253005B CN104253005B CN201310260580.3A CN201310260580A CN104253005B CN 104253005 B CN104253005 B CN 104253005B CN 201310260580 A CN201310260580 A CN 201310260580A CN 104253005 B CN104253005 B CN 104253005B
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- magnetron
- blast pipe
- microwave oven
- fixation wall
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Abstract
A kind of blast pipe of magnetron for microwave oven, body including tubular structure and the fixation wall by stretching out outside body and bending downwards, above-mentioned blast pipe is arranged on the ceramic ring above the antenna seal cover of magnetron, and the bottom of ceramic ring is fixed with antenna seal cover, the top of body seals after evacuation, and the length of body reduces 20 25% after sealing；Fixation wall lower end extends to the distance between place plane and body bottom place plane of farthest and reduces 18 21%.Chokes ability of the blast pipe for triple-frequency harmonics and four-time harmonic is improved by changing the reservation length of body upper end and the length of bottom of the pipe protrusion fixation wall, it is corresponding to inhibit caused useless high-frequency harmonic in magnetron work, on the premise of magnetron characteristic variations are not caused, the electromagnetic compatibility characteristic of magnetron for microwave oven is improved.
Description
Technical field
The invention belongs to the technical field of magnetron, and in particular to a kind of in the situation for keeping magnetron characteristic not change
Under, the blast pipe of the magnetron for microwave oven of raising magnetron electromagnetic compatibility characteristic.
Background technology
Fig. 1 is the magnetron structures longitudinal section of prior art；Fig. 2 is the knot of magnetron blast pipe position in the prior art
Structure schematic diagram.
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 barrel shape positive pole shell 11, formed with multiple radial blades 12 on the inwall of positive pole shell 11,
Inner and outer ring is welded on blade in lower groove to form.
Negative electrode portion includes that by formed spiral-shaped of W (tungsten) and TH (thorium) element and thermoelectron can be radiated on center shaft
Filament 13；The action space 14 for rotating thermoelectron is formed between the end of blade 12 and filament 13；In order to prevent from lamp
Silk 13 radiates the thermoelectron come and departed from from central shaft above-below direction, and upper seal 15 is formed in the top and bottom of filament 13
With lower seal 16；For filament supports 13 and power supply is introduced, insertion lower seal 16 is devised and connects top seal
The filament center guide rod 17 of part 15 and it is concomitantly introduced into power supply with central guide rod 17 and is connected the side guide rod 18 of lower seal 16.
Magnetic pole piece includes being fixed on the top and bottom of positive pole shell 11 and can form the upper magnetic pole 20 of magnetic flux, lower magnetic pole
21；In order to make to form magnetic field on action space 14, in the upper end of upper magnetic pole 20 and the lower end of lower magnetic pole 21 installation magnet 22.
Filtered in addition, also having insertion ceramic component 31 and connecting the one end of filament center guide rod 17 and the one end of side guide rod 18
The filter coil 32 of wave energy；Filter coil 32 is connected, and is connected across the capacitor 33 that both ends of power is introduced from outside into power supply；Shape
Into the top seal room 41 and lower seal room 42 that flux interaction is carried out on the top of upper magnetic pole 20 and the bottom of lower magnetic pole 21；For
Caused high frequency waves are transmitted into outside in action space 14, provided with being connected to blade 12 and penetrate upper magnetic pole 20 and top is close
The antenna 51 that the envelope center of room 41 extracts；In order to be cooled in the inner heat for producing and being transmitted by blade 12 of action space 14, if
It is equipped with cooling fin 61；Also have in addition and cooling fin 61 is protected shell 19 that the heat transmitted internally and by cooling fin 61 sheds etc.
Part.
Shell 19 includes accommodating the upper casing 19a of interior arrangement from upside and the lower casing 19b of interior arrangement is accommodated from downside.
Blast pipe 60 shown in figure is after magnetron pack is filled with, in order to magnetron is become vacuum when process is exhausted
The part of state cut-out.
Illustrate magnetron working condition as described above below.Pass through upper magnetic pole 20 and lower magnetic in magnetic field caused by magnet 22
When pole 21 forms magnetic flux, magnetic field is formed between blade 12 and filament 13.When being powered by capacitor 33, filament
13 radiate thermoelectron at a temperature of about 2000K, 4.0KV to 4.4KV of the thermoelectron between filament 13 and positive electrode portion and
Action space 14 in the presence of magnetic field caused by magnet 22 is rotated.
So, when being powered by central guide rod 17 and side guide rod 18 to filament 13, in blade 12 and filament 13
Between produce 2450MHZ or so electric field, become humorous in the presence of making thermoelectron in action space 14 by electric field and magnetic field
Ripple, and the antenna 51 of harmonic propagation to connection blade 12 is transmitted into outside.
In the basic wave (2450MHZ) for not being only useful for cooking caused by action space, also basic wave frequency rate integral multiple
High-frequency harmonic, mainly include the 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 to heat the article in micro-wave oven, integral multiple harmonic high frequency
Ripple easily causes strong electromagnetic interference to the electric elements of surrounding, and harmful, it is therefore necessary to reduces high frequency as far as possible
Harmonic wave leaks from magnetron.
The antenna seal cover of magnetron for microwave oven is surrounded by cover wall to be formed, and is arranged at the positive pole shell upper of magnetron,
And top seal room is internally formed in cover wall, antenna outlet is set 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.To avoid gap of the microwave between antenna seal cover and upper casing at combination
Leakage, a nested gasket rings 101 are needed in the upper end of antenna seal cover.
And the blast pipe 60 of magnetron for microwave oven of the prior art, including the body 63 of tubular structure and by body outside
The fixation wall 64 that portion stretches out and bent downwards, above-mentioned blast pipe are fixedly installed on the ceramics above the antenna seal cover of magnetron
On ring 62, and the bottom of ceramic ring is fixed with antenna seal cover, and the top of body seals after evacuation.After sealing in the prior art
The length of body is 9 millimeters, and fixation wall lower end is extended between the place plane of farthest and body bottom place plane
Distance be 2.6 millimeters.
Fig. 3 is the 6 δ management schematic diagrames of magnetron blast pipe in the prior art.As shown in figure 3, the magnetron of prior art
Mean values when the length of blast pipe body after sealing is 9 millimeters in 6 δ management are 7.4, and it is only 2.45 to manage Z values Zlt.
But the blast pipe of the magnetron of prior art can not effectively suppress the high-frequency harmonic of magnetron, part high-frequency harmonic
Can be from exhaust structure to outward leakage, so that the electromagnetic compatibility characteristic of magnetron for microwave oven is deteriorated, so as to human body and micro-
Electric elements around ripple stove have a negative impact.
The content of the invention
The present invention provides one kind for technical problem present in solution prior art and is keeping magnetron characteristic not change
In the case of, the blast pipe of the magnetron for microwave oven of raising magnetron electromagnetic compatibility characteristic.
The present invention is adopted the technical scheme that to solve technical problem present in prior art：
The blast pipe of the magnetron for microwave oven of the present invention, including the body of tubular structure and by stretching out outside body
And the fixation wall bent downward vertically, above-mentioned blast pipe are fixedly installed on the ceramic ring above the antenna seal cover of magnetron, and
The bottom of ceramic ring is fixed with antenna seal cover, and the top of body seals after evacuation, and the length of body reduces 20- after sealing
25%；Fixation wall lower end extends to the distance between place plane and body bottom place plane of farthest and reduces 18-
21%, the length of body is 7 millimeters after described sealing, and described fixation wall lower end extends to the place plane and pipe of farthest
The distance between plane where body bottom is 2.1 millimeters.
The present invention has the advantages and positive effects of：
In the blast pipe of the magnetron for microwave oven of the present invention, by changing the guarantor of the body upper end of blast pipe after sealing
Length is stayed to improve chokes ability of the magnetron to triple-frequency harmonics, while the length being inserted into by changing bottom of the pipe in ceramic ring
The choke structure to change blast pipe and be formed when ceramic ring interfixes is spent, so as to improve suppression of the magnetron to four-time harmonic
Ability processed, by the change to blast pipe two-end structure itself, so as to form the choke structure for being directed to high-frequency harmonic, accordingly
Caused useless high-frequency harmonic in magnetron work is inhibited, on the premise of magnetron characteristic variations are not caused, is improved
The electromagnetic compatibility characteristic of magnetron for microwave oven, so avoiding the possibility of microwave leakage in exhaust structure, make magnetron more
Add the nargin characteristic for reliably, improving magnetron, high-frequency harmonic is reduced when magnetron works to surrounding body and electrical equipment member
The adverse effect of part.
Brief description of the drawings
Fig. 1 is the magnetron structures longitudinal section of prior art；
Fig. 2 is the structural representation of magnetron blast pipe position in the prior art；
Fig. 3 is the 6 δ management schematic diagrames of magnetron blast pipe in the prior art；
Fig. 4 is the schematic diagram of the magnetron blast pipe of the present invention；
Fig. 5 is the 6 δ management schematic diagrames of the magnetron blast pipe of the present invention.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Fig. 1 is the magnetron structures longitudinal section of prior art；Fig. 2 is the knot of magnetron blast pipe position in the prior art
Structure schematic diagram；Fig. 3 is the 6 δ management schematic diagrames of magnetron blast pipe in the prior art；Fig. 4 is the magnetron blast pipe of the present invention
Schematic diagram；Fig. 5 is the 6 δ management schematic diagrames of the magnetron blast pipe of the present invention.
As shown in figure 4, the blast pipe of the magnetron for microwave oven of the present invention, including the body 63 of tubular structure and by body
The fixation wall 64 that outside stretches out and bent downwards, above-mentioned blast pipe 60 are fixedly installed on above the antenna seal cover of magnetron
On ceramic ring 62, and the bottom of ceramic ring is fixed with antenna seal cover 100, and the top of body seals after evacuation, under fixation wall
Numerical value during end extends to the distance between the place plane of farthest and body bottom place plane h compared with the prior art subtracts
Few about 19%, and the reservation distance H of body upper end after sealing reduces about 22% compared with the prior art simultaneously, body after sealing
Length be 7 millimeters, fixation wall lower end extends to the distance between the place plane of farthest and plane where body bottom
For 2.1 millimeters.As shown in figure 5, the Mean values when length of magnetron blast pipe body after sealing is 7 millimeters in 6 δ management are
6.4, and manage Z values Zlt and be promoted to 3.3.
In the blast pipe of the magnetron for microwave oven of the present invention, by changing the guarantor of the body upper end of blast pipe after sealing
Length is stayed to improve chokes ability of the magnetron to triple-frequency harmonics, while the length being inserted into by changing bottom of the pipe in ceramic ring
The choke structure to change blast pipe and be formed when ceramic ring interfixes is spent, so as to improve suppression of the magnetron to four-time harmonic
Ability processed, by the change to blast pipe two-end structure itself, so as to form the choke structure for being directed to high-frequency harmonic, accordingly
Caused useless high-frequency harmonic in magnetron work is inhibited, on the premise of magnetron characteristic variations are not caused, is improved
The electromagnetic compatibility characteristic of magnetron for microwave oven, so avoiding the possibility of microwave leakage in exhaust structure, make magnetron more
Add the nargin characteristic for reliably, improving magnetron.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, though
So the present invention is disclosed as above with preferred embodiment, however, the present invention is not limited to, it is any to be familiar with this professional technology people
Member, without departing from the scope of the present invention, the technology contents disclosed can be utilized to make a little change or modification certainly, into
For the equivalent embodiment of equivalent variations.In every case it is the content without departing from technical solution of the present invention, according to technical spirit of the invention
Any simple modification, equivalent change and modification made to above example, is belonged in the range of technical solution of the present invention.
Claims (1)
1. a kind of blast pipe of magnetron for microwave oven, including the body of tubular structure and by stretching out outside body and downwards
The fixation wall vertically bent, above-mentioned blast pipe is fixedly installed on the ceramic ring above the antenna seal cover of magnetron, and ceramic ring
Bottom fixed with antenna seal cover, the top of body seals after evacuation, it is characterised in that：The length of body is reduced after sealing
20-25%；Fixation wall lower end extends to the distance between place plane and body bottom place plane of farthest and reduces 18-
21%, the length of body is 7 millimeters after the sealing, and the fixation wall lower end extends to the place plane of farthest with body most
The distance between plane where lower end 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 |
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| Publication Number | Publication Date |
|---|---|
| CN104253005A CN104253005A (en) | 2014-12-31 |
| CN104253005B true CN104253005B (en) | 2018-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310260580.3A Active CN104253005B (en) | 2013-06-27 | 2013-06-27 | The blast pipe of magnetron for microwave oven |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020039288A1 (en) * | 2018-08-22 | 2020-02-27 | 3M Innovative Properties Company | Fault circuit indicator apparatus, system, and method |
Citations (5)
| 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 |
| CN1201360A (en) * | 1997-05-31 | 1998-12-09 | Lg电子株式会社 | Design method for magnetron for electronic range |
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60243938A (en) * | 1984-05-18 | 1985-12-03 | Hitachi Ltd | Magnetron |
| JP4016715B2 (en) * | 2002-05-21 | 2007-12-05 | 松下電器産業株式会社 | Magnetron |
| JP5361307B2 (en) * | 2008-09-25 | 2013-12-04 | 東芝ホクト電子株式会社 | Magnetron |
-
2013
- 2013-06-27 CN CN201310260580.3A patent/CN104253005B/en active Active
Patent Citations (5)
| 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 |
| CN1201360A (en) * | 1997-05-31 | 1998-12-09 | Lg电子株式会社 | Design method for magnetron for electronic range |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN104253005A (en) | 2014-12-31 |
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