CN1591748A - Magnetron output device - Google Patents
Magnetron output device Download PDFInfo
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- CN1591748A CN1591748A CN 03144169 CN03144169A CN1591748A CN 1591748 A CN1591748 A CN 1591748A CN 03144169 CN03144169 CN 03144169 CN 03144169 A CN03144169 A CN 03144169A CN 1591748 A CN1591748 A CN 1591748A
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- blast pipe
- output device
- antenna
- magnetron
- supporter
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Abstract
The present invention belongs to an output device of magnetron. It includes support body for fixing antenna cover, antural ceramics connected with said support body, exhaust pipe whose upper end is supported by said support body and mounted in the lower portion of said antenna cover and whose lower end is started from upper end of natural ceramics and is mounted in the interval having 3-4 mm distance from the natural ceramics and antenna feeding circuit which can transmit the microwave to exterior and is mounted on the internal circular wall of the exhaust pipe. Said invention utilizes the reasonable arrangement of length of exhaust pipe to raise attenuation capacity of triple harmonic and meet the allowable value of electromagnetic interference (EMI).
Description
Technical field
The invention belongs to a kind of structure of magnetron, be specifically related to a kind of output device of magnetron.
Background technology
Generally speaking, magnetron is to utilize the power supply that connects, in the filament heating of magnetron cathode, discharge hot electron, the magnetic field that the magnet that connects in inner utilization forms, form in effect of electric field space, when hot electron be rotated motion vertical with above-mentioned magnetic field, send microwave, and microwave is launched to the outside.As shown in Figure 1, magnetron is that the negative electrode by the filament shape that is installed in bosom constitutes tandem type negative electrode (8), around negative electrode (8) anode (5) is installed, and forms action space (6) between negative electrode (8) and anode (5).For introducing flux to action space (6), and top yoke (16) and bottom yoke (14) be installed respectively, in each yoke (14), (16) installed inside permanent magnet (10), (17), go up the magnetic pole (15) that formation magnetic force loop is installed in permanent magnet (10), (17), inner surface in anode (5), with a plurality of blades of radial installation (7), being pressed into installation on the periphery of anode (5) at regular intervals can be the quick cooling fin (9) that discharges to the outside of high heat that produces from anode (5).In addition, install and to constitute magnetrons output device to high order harmonic component (hereinafter to be referred as microwave) to antenna feeder (4), blast pipe (2), supporter (18), antenna pottery (3), the antenna cover (1) of external emission at the upside of the top of magnetron yoke (16).The unnecessary high order harmonic component that prevents to produce at action space (6) is installed to the choking coil (12) of power supply adverse current and the protection box (13) of capacitor (11) at the downside of bottom yoke (14).Actual above-mentioned magnetron is exactly the tandem type negative electrode (8) by the filament shape of central interior arrangement, with a kind of 2 utmost point vacuum tubes of anode (5) formation of installing around negative electrode (8).
Below, the course of work of the magnetron of prior art is described:
At first, the hot electron that in negative electrode (8), produces, radiate to the action space (6) between afterbody that is the radial blade that is fixed (7) on the anode (5) and negative electrode (8), in the magnetic force loop that electric field, permanent magnet (10), (17), top and the bottom yoke (14) that forms between blade (7) and negative electrode (8), (16), magnetic pole (15) constitute, by the flux of foundation to action space (6) input, carry out shuttling movement, electronic microwave transmits to blade (7).Afterwards, microwave is by be connected the magnetrons output device that antenna feeder (4), antenna pottery (3) and antenna cover (1) on the blade (7) constitute in installation on the internal perisporium face of blast pipe (2), to external emission.At this moment, to the energy that action space (6) transmits basic wave (2455MHZ) is arranged not only, also have high order harmonic component from negative electrode (8).Above-mentioned high order harmonic component is meant the frequency of the integral multiple that second high order harmonic component (4900MHZ) of frequency more than 2455MHZ, the 3rd high order harmonic component (7350MHZ), the 4th high order harmonic component (9.8GHZ), the 5th high order harmonic component (12.5GHZ) etc. produce.Above-mentioned high order harmonic component composition is sent to the outside with basic wave by the antenna feeder (4) in the blast pipe (2).But above-mentioned high order harmonic component has the shortcoming of the short more hard-to-break more of wavelength.Therefore, the short high order harmonic component of wavelength is leaked to the outside, becomes a reason that causes electromagnetic interference.Particularly the 3-4 high order harmonic component approximately is between 7.35GHZ-9.8GHZ, becomes the principal element of electronic jamming.Therefore, in the microwave of launching by above-mentioned output device, as shown in Figure 1,, blast pipe (2) has been installed in output device in order to check high order harmonic component.But, because the lower end of blast pipe (2) extends to the middle part of antenna pottery (3) always, so have the shortcoming that reduces 3-4 high order harmonic component attenuation characteristic.That is, the blast pipe of prior art is placed in the middle part that always extends to the antenna pottery, so that the tolerance limit deficiency, causes can not satisfying the electromagnetic interference (EMI) permissible value in the 3rd high order harmonic component scope.As shown in Figure 2, utilize the magnetron of the blast pipe of prior art, the EMI characteristic that is produced is represented high order harmonic component with circle, for example: in the 3rd high order harmonic component, have the shortcoming above the EMI permissible value.That is, the anode pad value at the magnetron of the blast pipe that utilizes prior art has the shortcoming that has surpassed the permissible value of EMI in the 3rd high order harmonic component.This is because the length of the blast pipe in the output device is oversize, extend to the middle part of antenna pottery always, because the tolerance limit deficiency, cause having crossed the permissible value of electromagnetic interference (EMI) at the 3rd high order harmonic component wide-ultra, that is, produced the problem of the damping capacity decline of the 3rd high order harmonic component.
Summary of the invention
The objective of the invention is to disclose a kind of, improve the output device of magnetron of the damping capacity of the 3rd high order harmonic component by regulating the blast pipe length in the magnetrons output device.Technical scheme of the present invention is: magnetrons output device comprises the supporter of fixed antenna lid, the antenna pottery that is connected with supporter, utilize the support of above-mentioned supporter, the bottom that its upper end is installed in antenna cover, the lower end is from the upper end of antenna pottery, and at a distance of certain intervals blast pipe is installed, and can be transmitted into the outside to microwave, be installed in antenna feeder on the inner peripheral wall of blast pipe with it.Above-mentioned certain intervals is 3-4mm, and the length of blast pipe is 10 ± 0.2mm.
Description of drawings
Fig. 1 is the profile of the magnetron of prior art;
Fig. 2 is the performance plot of electromagnetic interference (EMI) of the magnetron of prior art;
Fig. 3 is the profile of magnetron of the present invention;
Fig. 4 is the profile of the output device of magnetron of the present invention;
Fig. 5 is the face figure of the blast pipe of magnetron of the present invention;
Fig. 6 is the property list of the electromagnetic interference (EMI) of magnetron of the present invention;
Fig. 7 is the performance plot of the electromagnetic interference (EMI) of magnetron of the present invention.
Wherein:
1 antenna cover, 2 blast pipes
3 antennas pottery, 4 antenna feeders
5 anodes, 6 action spaces
7 blades, 8 negative electrodes
9 cooling fins, 10 permanent magnets
11 capacitors, 12 choking coils
13 protection boxes, 14 bottom yokes
15 magnetic poles, 16 top yokes
17 permanent magnets, 18 supporters
100 blast pipe 100-1 supporters
300 output devices
Specifically execute real mode
Following the present invention is described in detail with reference to accompanying drawing: as shown in Figure 3, magnetron comprises that the negative electrode of the filament shape that is installed in bosom constitutes tandem type negative electrode (8), anode (5) is installed around negative electrode (8), between negative electrode (8) and anode (5), form action space (6), for introducing flux to action space (6), top yoke (16) and bottom yoke (14) are installed respectively, in each yoke (14), (16) installed inside permanent magnet (10), (17), in permanent magnet (10), (17) go up the magnetic pole (15) that formation magnetic force loop is installed, inner face in anode (5), by a plurality of blades of radial installation (7), being pressed into installation on the outer circumference surface of anode (5) at regular intervals can be the quick cooling fin (9) that discharges to the outside of high heat that produces from anode (5).In addition, top yoke (16) upside of magnetron is installed with the blast pipe (100) that is supported by the supporter (100-1) that utilizes control antenna lid (1); For microwave is discharged into the outside, on the top of anode (5) and at the inner peripheral wall mounted antennas feeder (4) of blast pipe (100), antenna pottery (3) the formation magnetrons output device (300) that utilizes supporter (100-1) to be connected with blast pipe (100).
Downside in bottom yoke (14) is equipped with the unnecessary high order harmonic component that prevents from action space (6) to produce to the choking coil (12) of power supply adverse current, the protection box (13) of tube type high-voltage capacitor (11).In fact, magnetron is exactly the tandem type negative electrode (8) by the filament shape of bosom device, a kind of 2 utmost point vacuum tubes that form with the anode of installing on the circumference of negative electrode (8) (5).The course of work of magnetron of the present invention is same as the prior art.As shown in Figure 4, feature compared with prior art of the present invention is: the magnetron efferent comprises the supporter (100-1) of fixed antenna lid (1), blast pipe (100) by supporter (100-1) support, for microwave is discharged into the outside, be installed in the antenna feeder (4) on the inner peripheral wall of blast pipe, be fixed on the antenna pottery (3) that supporter (100-1) is gone up, is installed in the lower end of blast pipe (100).The upper end of blast pipe (100) is installed in the bottom of antenna cover (1), and the lower end of blast pipe (100) utilizes supporter (100-1), from the upper end of antenna ceramic body (3), and fixed installation at certain intervals.As shown in Figure 5, the length of blast pipe (100) is preferably 10 ± 0.2mm, and blast pipe (100) is preferably installed with the interval of 3-4mm from the upper end of antenna ceramic body (3).The height of supporter (100-1) is preferably 4 ± 0.1mm.The bottom diameter of blast pipe (100) should be 6.4 ± 0.1mm, and external diameter should be 8.0 ± 0.1mm, and the upper end external diameter of blast pipe (100) should be 11.5 ± 0.1mm, and internal diameter should be 9.9 ± 0.1mm.From the upper end of antenna ceramic body (3), blast pipe (100) is installed at certain intervals, to improve the damping capacity of the 3rd high order harmonic component.As shown in Figure 6, the anode pad value that utilizes prior art the 3rd high order harmonic component is 70.66 (dBPW), and the anode pad value that utilizes the present invention's the 3rd high order harmonic component is 54.38 (dBPW).That is, use the magnetron of blast pipe of the present invention (100) magnetron than the blast pipe that uses prior art, its anode pad value has been enhanced 15 (dB) in the 3rd high order harmonic component.As shown in Figure 7, represent high order harmonic component, in the scope of the 3rd high order harmonic component, satisfied the EMI permissible value with circle.That is, with represent in the property list identical, above-mentioned pad value is 54.38 (dBPW), uses the magnetron utilize blast pipe of the present invention (100) magnetron than the blast pipe that uses prior art, its anode pad value has improved 15 (dB) in the 3rd high order harmonic component.Improved the damping capacity of the 3rd high order harmonic component, satisfied that electromagnetism is dried scratches (EMI) permissible value.
Claims (14)
1. the output device of a magnetron, the antenna feeder that can be transmitted into microwave the outside on the inner peripheral wall that it comprises supporter, the antenna pottery, the blast pipe that are connected with supporter of fixed antenna lid and is installed in blast pipe, it is characterized in that: blast pipe is positioned at the bottom of antenna cover by support body supports, its upper end, its lower end fixedly mounts at certain intervals from the upper end of antenna pottery.
2. the output device of a kind of magnetron according to claim 1, it is characterized in that: the length of blast pipe is 10 ± 0.2mm.
3. the output device of a kind of magnetron according to claim 1 is characterized in that: install with the interval of 3-4mm from the upper end of antenna pottery the lower end of blast pipe.
4. the output device of a kind of magnetron according to claim 1, it is characterized in that: the height of supporter is 4 ± 0.1mm.
5. the output device of a kind of magnetron according to claim 1, it is characterized in that: blast pipe can be removed the 3rd high order harmonic component.
6. the output device of a magnetron, the antenna feeder that can be transmitted into microwave the outside on the inner peripheral wall that it comprises supporter, the antenna pottery, the blast pipe that are connected with supporter of fixed antenna lid and is installed in blast pipe, it is characterized in that: blast pipe is positioned at the bottom of antenna cover by support body supports, its upper end, install with the fixed interval of 3-4mm from the upper end of antenna pottery its lower end.
7. the output device of a kind of magnetron according to claim 6, it is characterized in that: the length of blast pipe is 10 ± 0.2mm.
8. the output device of a kind of magnetron according to claim 6, it is characterized in that: the height of supporter is 4 ± 0.1mm.
9. the output device of a kind of magnetron according to claim 6, it is characterized in that: blast pipe can be removed the 3rd high order harmonic component.
10. the output device of a magnetron, it comprises negative electrode, be installed in the anode on every side of negative electrode, between negative electrode and anode, form action space, for introducing flux to action space, top yoke and bottom yoke are installed respectively, installed inside permanent magnet in each yoke, the magnetic pole that constitutes the magnetic force loop is installed on permanent magnet, on the anode inner peripheral surface with a plurality of blades of radial installation, being pressed into installation on the outer circumference surface of anode at certain intervals can be the quick cooling fin that discharges to the outside of high heat that produces from anode, at the top of magnetron yoke upside, the blast pipe by the support body supports of utilizing the control antenna lid is installed; For microwave is discharged into the outside; on the top of anode and in the inner peripheral wall mounted antennas feeder of blast pipe; the antenna pottery that is connected with supporter; downside in the bottom yoke; the unnecessary high order harmonic component that prevents to produce is installed to the choking coil of power supply adverse current and the protection box of tube type high-voltage capacitor in action space; it is characterized in that: the upper end of blast pipe is positioned at the bottom of antenna cover, and its lower end fixedly mounts at certain intervals from the upper end of antenna pottery.
11. the output device of a kind of magnetron according to claim 10 is characterized in that: the length of blast pipe is 10 ± 0.2mm.
12. the output device of a kind of magnetron according to claim 10 is characterized in that: install with the interval of 3-4mm from the upper end of antenna pottery the lower end of blast pipe.
13. the output device of a kind of magnetron according to claim 10 is characterized in that: the height of supporter is 4 ± 0.1mm.
14. the output device of a kind of magnetron according to claim 10 is characterized in that: blast pipe can be removed the 3rd high order harmonic component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031441696A CN100474492C (en) | 2003-08-26 | 2003-08-26 | Magnetron output device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031441696A CN100474492C (en) | 2003-08-26 | 2003-08-26 | Magnetron output device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1591748A true CN1591748A (en) | 2005-03-09 |
| CN100474492C CN100474492C (en) | 2009-04-01 |
Family
ID=34597444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031441696A Expired - Fee Related CN100474492C (en) | 2003-08-26 | 2003-08-26 | Magnetron output device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100474492C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253005A (en) * | 2013-06-27 | 2014-12-31 | 乐金电子(天津)电器有限公司 | Exhaust pipe of magnetron for microwave oven |
-
2003
- 2003-08-26 CN CNB031441696A patent/CN100474492C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104253005A (en) * | 2013-06-27 | 2014-12-31 | 乐金电子(天津)电器有限公司 | Exhaust pipe of magnetron for microwave oven |
| CN104253005B (en) * | 2013-06-27 | 2018-01-12 | 乐金电子(天津)电器有限公司 | The blast pipe of magnetron for microwave oven |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100474492C (en) | 2009-04-01 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090401 Termination date: 20110826 |