CN102237237A - Negative part structure of magnetron - Google Patents
Negative part structure of magnetron Download PDFInfo
- Publication number
- CN102237237A CN102237237A CN2010101627816A CN201010162781A CN102237237A CN 102237237 A CN102237237 A CN 102237237A CN 2010101627816 A CN2010101627816 A CN 2010101627816A CN 201010162781 A CN201010162781 A CN 201010162781A CN 102237237 A CN102237237 A CN 102237237A
- Authority
- CN
- China
- Prior art keywords
- magnetron
- seal
- shielding cap
- guide rod
- filament
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
The invention relates to a negative part structure of a magnetron. A shielding cap with a smooth structure and an upper convex cambered surface is formed at the upper end of an upper sealing element; the surface area of the upper surface of the shielding cap is correspondingly increased, so that the radiance of the upper surface of the shielding cap is improved to make energy collected on a negative part of the magnetron timely and outwards diffused, cool the shielding cap and the whole negative part of the magnetron, enable the negative part of the magnetron to operate at normal temperature, avoid the damage to the magnetron caused by over-high temperature of the negative part, and prolong the normal service life of the magnetron. Arc bevel angles are positioned at junctions of all planes and circumference surfaces of the upper sealing element and a lower sealing element, the original closed angles on all parts of the negative part are eliminated, the magnetron is prevented from high-voltage breakdown caused by the closed angles, and a product fault caused by fire striking of the magnetron negative is avoided.
Description
Technical field
The invention belongs to the technical field of magnetron, being specifically related to a kind of upper surface that adopts is the shielding cap of arc surface, chamfering is set simultaneously removes corner angle on the upper and lower seal respectively, thereby improve the hot electron radiance, avoid the negative pole part structure of the magnetron of high-voltage breakdown.
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 schematic diagram of the negative pole part structure of magnetron in the prior art.
As shown in Figure 1 to Figure 3, magnetron mainly includes: anode portion; 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 the 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.
Position, lower seal chamber at the corresponding lower magnetic pole in the lower end of magnetron is provided with ceramic component 31, 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 by cathode terminal respectively; Surround the shielding box 34 that the filter coil setting is made 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.
The following describes aforesaid magnetron working condition.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.When switching on by 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 the 4.0KV 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 by 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 leak from magnetron.
The antenna side choke structure of magnetron comprises: be arranged at the anode casing top of magnetron and form the antenna seal cover 100 and the airtight antenna seal cover that is welded in of top seal chamber inner and form the tubular chokes wall 101 of choke groove 102 jointly with the antenna seal cover inwall; 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; 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 by 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 by 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.
But prior art has the following disadvantages:
In the negative pole part structure of the prior art of magnetron, shielding cap is arranged on the outstanding frustum cone structure of upper seal upper end, the upper surface of shielding cap is the plane of a circle, negative pole part produces a large amount of heat when magnetron is started working, the hot electron that filament produces is mainly outwards launched by the shielding cap of upper seal upper end, promptly pass through the upper surface heat of emission electronics that the shielding cap circular flat constitutes, the radiance of upper surface is less, cause the temperature of shielding cap and whole magnetron cathode portion too high easily, thereby shorten the useful life of magnetron.In addition, because upper seal and lower seal all adopt cylindrical structural, the upper surface of the plane in upper seal and lower seal and the intersection of periphery and shielding cap contacts with upper seal and is connected part and all forms sharp-pointed relatively corner angle, these corner angle cause too high voltage to compile in the use of magnetron easily, thereby cause the magnetron damage that is broken down by high-voltage.
Summary of the invention
The present invention is the shielding cap of arc surface for the technical problem that exists in the solution prior art provides a kind of upper surface that adopts, chamfering is set simultaneously removes corner angle on the upper and lower seal respectively, thereby improve the hot electron radiance, avoid the negative pole part structure of the magnetron of high-voltage breakdown.
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 comprises: filament, on the central axis direction of magnetron, form by tungsten and thorium element, and have spiral-shaped and can radiate hot electron, at the upper and lower side of filament columniform upper seal and lower seal are set respectively; Shielding cap is arranged on the upper end of upper seal, forms by upper seal is protruding upward; 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 by bonding pad; The side guide rod, the lower seal 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 by bonding pad; Ceramic component, be arranged on the lower seal chamber downside that is surrounded by the negative electrode capping, in the ceramic component upper end two non-touching bonding pads 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; The upper surface of shielding cap is the level and smooth cambered surface of epirelief.
The present invention can also adopt following technical measures:
The profile of overlooking of described shielding cap is circle, and the central shaft of shielding cap and upper seal is a coaxial configuration.
Fit tightly between described shielding cap and upper seal.
Seamlessly transit between the upper surface of described shielding cap and the upper seal.
The upper surface of described shielding cap and the contact position of upper seal form the cambered surface of a circle indent.
The intersection location on all periphery and plane forms chamfering on columniform upper seal and lower seal.
Advantage and good effect that the present invention has are:
In the negative pole part structure of magnetron of the present invention, the upper seal upper end forms the shielding cap of the smooth structure with last convex globoidal, the corresponding increase of the surface area of the upper surface of shielding cap, thereby improved the radiance of shielding cap upper surface, the energy that converges in the magnetron cathode portion can in time outwards be dispersed, to reduce the temperature of shielding cap and whole magnetron cathode portion, magnetron cathode portion is under the normal temperature regime works, the magnetron of avoiding causing because of the negative pole part temperature is too high damages, and has prolonged the operate as normal life-span of magnetron.In addition, the intersection of all planes and periphery all is provided with circular arc chamfering on upper seal and lower seal, eliminated original wedge angle on each parts of negative pole part, avoided because the caused magnetron high-voltage breakdown of wedge angle prevents the product bug that the magnetron cathode sparking is caused.
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 schematic diagram of the negative pole part structure of magnetron in the prior art;
Fig. 4 is the schematic diagram of the negative pole part structure of magnetron of the present invention.
Embodiment
The present invention will be described in detail below in conjunction with drawings and Examples.
Fig. 4 is the schematic diagram of the negative pole part structure of magnetron of the present invention.
As shown in Figure 4, the negative electrode capping of magnetron is arranged on the bottom of magnetron lower magnetic pole, be tightly connected with the anode casing of magnetron and form the lower seal chamber, the negative electrode capping of metal material closely is connected by welding with anode casing, and the centre position of negative electrode capping bottom is provided with the opening that passes for cathode terminal.Position, lower seal chamber at the corresponding lower magnetic pole in the lower end of magnetron is provided with ceramic component, and ceramic component is combined closely with the negative electrode capping that forms the lower seal chamber; Two cathode terminals that pass ceramic component are set in ceramic component, the filter coil with filter function is set in addition, two sections filter coils connect central guide rod one end of filament and an end of side guide rod by cathode terminal respectively; Surround the shielding box that the filter coil setting is made of metal material, the airtight space of the inner formation of shielding box, through hole 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, and the capacitor of power supply is introduced in cross-over connection in both ends of power from the outside.
Shielding box in the bottom of magnetron constitutes the part of magnetron, and the filter coil in the shielding box is made of one group of corresponding mutually coil that is provided with, and connects the central guide rod and the side guide rod of filament in the magnetron respectively by cathode terminal, forms circuit communication; Shielding box is made of metallic plate, surrounds filter coil, its airtight space of inner formation, the circuit of protection filter coil and filter coil connects, and on the top of shielding box through hole is set, and through hole and shielding box that shielding box top is passed in the lower end of the ceramic component of magnetron fix; Capacitor is arranged on outside the above-mentioned shielding box, passes shielding box by the connection lead and is connected with filter coil, and power supply is supplied with to magnetron.
The negative pole part structure of magnetron comprises: filament, on the central axis direction of magnetron, form by tungsten and thorium element, and have spiral-shaped and can radiate hot electron, at the upper and lower side of filament columniform upper seal and lower seal are set respectively; Shielding cap 15a is arranged on the upper end of upper seal, forms by upper seal is protruding upward; Central authorities' guide rod 17, make by the noble metal that conductance is high, connect the lower seal 16 of magnetron and connect upper seal 15, central guide rod between lower seal and upper seal is positioned at the axis part of magnetron, filament supports 13 also is filament introducing power supply, the bonding pad that its lower end and ceramic component upper end are provided with is fixed, and is electrically connected with cathode terminal by bonding pad; Side guide rod 18, made by the high noble metal of conductance equally, its upper end connects the lower seal 16 of magnetron, cooperates with central guide rod 17 to filament and introduces power supply, the bonding pad that the lower end of side guide rod and ceramic component upper end are provided with is fixed, and is connected with cathode terminal by bonding pad; Ceramic component, pottery by insulation constitutes, be arranged on the lower seal chamber downside that is surrounded by the negative electrode capping, in the ceramic component upper end two non-touching bonding pads 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, closely be connected between ceramic component and the negative electrode capping lower ending opening, leak to prevent high-frequency harmonic.
The outstanding shielding cap 15a upper surface that is provided with adopts nonplanar structure in columniform upper seal upper end, and from end view as can be seen, the upper surface of shielding cap is the smooth arc of epirelief.Cambered surface protruding upward can enlarge the area of shielding cap upper surface on the one hand, promptly increase thermionic emission, improve the emissivity of shielding cap, on the other hand, level and smooth circular arc upper surface can reduce the generation of wedge angle and burr on the shielding cap, reduces the zone that forms partial high pressure on the negative pole part.
Corresponding with columniform upper seal, the profile of overlooking of shielding cap is circle, and the central shaft of shielding cap and upper seal is a coaxial configuration, shielding cap is looked up from the side of overlooking be arranged on the centre position of upper seal, thereby thermionic transmit direction concentrates on the shaft core position of magnetron more when making magnetron work, and circular shielding cap makes thermionic emission more even.
When shielding cap and upper seal assembling, should guarantee to fit tightly between shielding cap and upper seal, avoid taking place the space between the two, prevent to cause high-voltage breakdown because of the wedge angle in space.Shielding cap can adopt integrated structure with upper seal.
Form outstanding wedge angle and burr in order to eliminate shielding cap and upper seal convergence part place, should make between the upper surface of shielding cap and the upper seal and seamlessly transit, shielding cap sees by the cambered surface smooth connection intersection of the upper end of upper surface and upper seal in the cambered surface of the contact position formation one circle indent of upper surface and upper seal from the side.
The intersection location on all periphery and plane forms chamfering structure 40 on columniform upper seal and lower seal, eliminates the outstanding wedge angle of face intersection above the cylinder by the continuous circular arc face of chamfering structure.
In the negative pole part structure of magnetron of the present invention, the upper seal upper end forms the shielding cap of the smooth structure with last convex globoidal, the corresponding increase of the surface area of the upper surface of shielding cap, thereby improved the radiance of shielding cap upper surface, the energy that converges in the magnetron cathode portion can in time outwards be dispersed, to reduce the temperature of shielding cap and whole magnetron cathode portion, magnetron cathode portion is under the normal temperature regime works, the magnetron of avoiding causing because of the negative pole part temperature is too high damages, and has prolonged the operate as normal life-span of magnetron.In addition, the intersection of all planes and periphery all is provided with circular arc chamfering on upper seal and lower seal, eliminated original wedge angle on each parts of negative pole part, avoided because the caused magnetron high-voltage breakdown of wedge angle prevents the product bug that the magnetron cathode sparking is caused.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention with preferred embodiment openly as above, yet, be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, certainly can utilize the technology contents of announcement to make a little change or modification, become the equivalent embodiment of equivalent variations, be the content that does not break away from technical solution of the present invention in every case, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all belong in the scope of technical solution of the present invention.
Claims (6)
1. the negative pole part structure of a magnetron comprises: filament, on the central axis direction of magnetron, form by tungsten and thorium element, and have spiral-shaped and can radiate hot electron, at the upper and lower side of filament columniform upper seal and lower seal are set respectively; Shielding cap is arranged on the upper end of upper seal, forms by upper seal is protruding upward; 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 by bonding pad; The side guide rod, the lower seal 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 by bonding pad; Ceramic component, be arranged on the lower seal chamber downside that is surrounded by the negative electrode capping, in the ceramic component upper end two non-touching bonding pads 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; It is characterized in that: the upper surface of shielding cap is the level and smooth cambered surface of epirelief.
2. the negative pole part structure of magnetron according to claim 1 is characterized in that: shielding cap overlook profile for circular, and the central shaft of shielding cap and upper seal is a coaxial configuration.
3. the negative pole part structure of magnetron according to claim 2 is characterized in that: fit tightly between shielding cap and upper seal.
4. the negative pole part structure of magnetron according to claim 3 is characterized in that: seamlessly transit between the upper surface of shielding cap and the upper seal.
5. the negative pole part structure of magnetron according to claim 4 is characterized in that: the cambered surface of the upper surface of shielding cap and the contact position of upper seal formation one circle indent.
6. the negative pole part structure of magnetron according to claim 1 is characterized in that: all periphery and the intersection location on plane form chamfering on columniform upper seal and lower seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101627816A CN102237237A (en) | 2010-05-05 | 2010-05-05 | Negative part structure of magnetron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101627816A CN102237237A (en) | 2010-05-05 | 2010-05-05 | Negative part structure of magnetron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102237237A true CN102237237A (en) | 2011-11-09 |
Family
ID=44887778
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101627816A Pending CN102237237A (en) | 2010-05-05 | 2010-05-05 | Negative part structure of magnetron |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102237237A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850524A (en) * | 2020-07-17 | 2020-10-30 | 广东威特真空电子制造有限公司 | Rare earth tungsten cathode and preparation method and application thereof |
-
2010
- 2010-05-05 CN CN2010101627816A patent/CN102237237A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111850524A (en) * | 2020-07-17 | 2020-10-30 | 广东威特真空电子制造有限公司 | Rare earth tungsten cathode and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103346053A (en) | 2450-MHz high-power continuous-wave magnetron and preparation method thereof | |
| US20070151847A1 (en) | Magnetron | |
| CN204946855U (en) | A kind of New X ray tube rotating anode arrangement | |
| CN102237240A (en) | Filtering structure of magnetron | |
| EP1801839B1 (en) | Magnetron | |
| KR100774467B1 (en) | Choke filter of magnetron | |
| CN102237237A (en) | Negative part structure of magnetron | |
| CN101640156A (en) | Choke structure of magnetron | |
| CN102238765A (en) | Antenna cap of magnetron | |
| CN102820194A (en) | Cathode ceramic structure of magnetron | |
| CN102820193A (en) | Cathode part structure of magnetron | |
| CN102237241A (en) | Negative seal cover of magnetron | |
| CN105006415A (en) | Novel X-ray tube rotating anode device | |
| CN102243971A (en) | Cathode wire structure for magnetron | |
| KR100765948B1 (en) | Cooling device of magnetron | |
| CN102630332A (en) | Magnetron and apparatus that uses microwaves | |
| CN102237238A (en) | Cathode lead structure of magnetron | |
| CN102820195A (en) | Antenna seal cap of magnetron | |
| CN101640151A (en) | Magnetic pole structure of magnetron | |
| CN103311074A (en) | Upper magnetic pole structure of magnetron | |
| WO2012120903A1 (en) | Magnetron and device utilizing microwaves | |
| CN104253005B (en) | The blast pipe of magnetron for microwave oven | |
| CN102237239A (en) | Choking structure of magnetron | |
| CN101206985A (en) | Leakage-proof filter of permatron | |
| KR100640794B1 (en) | Connecting lead in magnetron |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20111109 |