CN107104262A - A kind of method and cavity resonator structure for improving microwave cavity magnetic distribution uniformity - Google Patents
A kind of method and cavity resonator structure for improving microwave cavity magnetic distribution uniformity Download PDFInfo
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- CN107104262A CN107104262A CN201710228622.3A CN201710228622A CN107104262A CN 107104262 A CN107104262 A CN 107104262A CN 201710228622 A CN201710228622 A CN 201710228622A CN 107104262 A CN107104262 A CN 107104262A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
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Abstract
A kind of microwave cavity body method and structure for improving magnetic distribution uniformity, it is characterized in that setting multiple strong-electromagnetic field regions and light current field region in microwave resonance cavity, different zones are separated by isolation boundary with holes, the electromagnetic field of light current field region is heated object and heated in light current field region by strong field feed-in after the multiple reflections of border.The magnetic distribution uniformity of light current field region where the present invention can effectively improve heated object, the reduction product solidification temperature difference.
Description
Technical field
The present invention relates to a kind of Composites Molding Techniques, especially a kind of Composite Microwave forming technique, specifically
Say it is that a kind of can improve the method and microwave resonance cavity configuration of microwave cavity magnetic distribution uniformity.
Background technology
Advanced composite material has specific strength and specific modulus height, good anti-fatigue performance, corrosion resistance and good and global formation
Property many excellent specific properties such as good, widely apply composite not only can significantly mitigate the construction weight of aircraft on aircraft, carry
The performance of high aircraft, can also greatly reduce amount of parts, simplify frock, beneficial to big part assembling is carried out, accelerate manufacture week
Phase.Application site is from secondary load-carrying construction to main force support structure transition, and current composite is widely used in various control surfaces, wing
With the primary load bearing position such as fuselage.Multiple application of the material on complex-curved component is more and more, such as air intake duct, frame sections, pressure every
Frame etc..Component develops to global formation, co-curing direction, can significantly reduce the quantity of part, fastener and mould, significantly
Ground reduces assembly process, is the important measures of composite structure loss of weight, is also to reduce a kind of effective ways of cost.
At present, the main moulding process of advanced composite material is solidification of hot-press tank technique.By composite and mould
Sent into after encapsulation in autoclave, temperature-pressure curing molding.Solidification of hot-press tank technique heats composite with heat exchange pattern, multiple
The temperature difference inside condensation material is big；All material is both needed to be heated to high temperature, high energy consumption, cure cycle including gas medium in tank body
Long, efficiency is low.Microwave curing composite technology is a kind of potential technology for substituting autoclave, can be inside and outside while
Even heating composite, firing rate is fast.During microwave curing, only heat other materials in composite, tank and be situated between with gas
Matter is not heated, and energy consumption is low, and cure cycle is short, efficiency high.
Microwave has that firing rate is fast, temperature is easily controllable, energy consumption is low, selectivity heating, can be to large-scale and thicker
Complex structural member the advantages of heated, widely applied in industrial circle and sphere of life.But microwave resonance
The surrounding of chamber be in metal material, transmitting procedure microwave can be reflected in metal wall.Incidence wave and back wave by be superimposed into
One step formation standing wave.In heating process, the node and antinode of fixed standing wave can be heated the cold spot of formation temperature on object
And focus, so as to cause to be heated object temperature skewness, the local temperature difference of 200mm size parts is even as high as to 60 DEG C,
So as to the main bottleneck as limitation microwave heating development.To solve the above problems, existing way be using multichannel microwave source,
The methods such as mode stirrer are to avoid forming fixed cold spot and hotspot's distribution in a certain region.Although however, multichannel microwave source
Improve the uniformity of microwave field to a certain extent, but be due to that the number of microwave source is limited by microwave resonance chamber size and cost
System, can only change the original electromagnetic field of burning to a certain degree, it is impossible to effectively improve electromagnetism distributing homogeneity.Mode stirrer passes through reflection
Microwave is identical with the improvement principle in multichannel microwave source to avoid the formation of single magnetic distribution, can not equally improve resonator
The uniformity of interior electromagnetic field.
The content of the invention
The purpose of the present invention is to lead to attain heating-up temperature lack of homogeneity due to microwave reflection for existing microwave cavity,
The problem of influenceing heating effect and material, invents a kind of method that can improve microwave cavity magnetic distribution uniformity,
Designing simultaneously a kind of can improve the microwave resonance cavity of microwave cavity magnetic distribution uniformity.
One of technical scheme is：
A kind of method that can improve microwave cavity magnetic distribution uniformity, it is characterized in that by being set in microwave resonance cavity
Isolation boundary with holes is put, microwave resonance cavity is separated into strong-electromagnetic field region and light current field region, light current field region
Electromagnetic field after both border multiple reflections, is incided weak by the electromagnetic field of strong field via the hole on isolation boundary with holes
Electromagnetic spectrum；Formed to heat after intercoupling and interfere between microwave source, the microwave source of enormous amount on isolation boundary hole and placed
In the heating target of light current field region, the area size of cold spot and focus is greatly reduced, so as to improve microwave cavity
Interior magnetic distribution uniformity；Cold spot characterizes magnetic distribution uneven in cavity with focus, and cold spot is the node of standing wave,
Focus is the antinode of standing wave.
It can increase electromagnetic field in forceful electric power in strong-electromagnetic field region increase mode stirrer to further improve uniformity
Field region and the reflection on border.
Described isolation boundary with holes is using not wave transparent exotic material.
Described not wave transparent exotic material is metal material or the material being made up of light material internal layer and metal surface.
Described isolation boundary surface configuration with holes is plane or complex-curved；Isolation boundary with holes can be single border
Or by multiple single boundary combinations into polygon cavity；The status requirement of isolation boundary with holes is not parallel to nearest microwave
Resonant cavity wall, the required distance minimum value of itself and microwave resonance cavity wall is 1/4 wavelength, and maximum is 4 wavelength；
Isolation boundary with holes uses welding, riveting, screw thread with wall, support column or hinge to connect in the fixing means of microwave resonance intracavitary
Connect mechanical connection or splicing, the on-mechanical connection of electromagnetic adsorption class of class；The support column or hinge class connecting material used is non-
Metal material；Hole is shaped as rectangle on isolation boundary with holes, and waist type is circular and cross；Perforate on isolation boundary with holes
Size increases with increasing with the distance of antenna for radiating microwave, and the diameter or length in hole are not less than electromagnetic field wavelength in cavity
1/4, Kong Yukong between beeline equally be not less than electromagnetic field wavelength 1/4；The arragement direction in hole can single direction arrangement
Multidirectional it can also arrange.
Multichannel microwave antenna assembly is set in microwave resonance cavity outside wall surface；Microwave generating apparatus launches microwave, and passes through
The coupling device of overshoot antenna or microwave resonance cavity contact position can be controlled individually to inside cavity feed-in microwave, its power
Also control can be combined；Microwave frequency range is 300MHz~300GHz；Microwave frequency can immobilize or according to more than 20MHz's
Scope linearly or nonlinearly changes；Microwave aerial assembly can be Waveguide slot antenna, flagpole antenna, circular loop antenna, helical day
One or more in line, electromagnetic horn or microstrip antenna.
The two of technical scheme are：
It is a kind of to improve the microwave resonance cavity of microwave cavity magnetic distribution uniformity, it is characterized in that it is included outside polygon
Cavity 2, microwave aerial assembly 1 is arranged on described outer chamber 2, is provided with what is be made up of isolation boundary with holes in outer chamber 2
Inner chamber body 3, heating target is arranged in inner chamber body 3；The microwave that microwave aerial assembly 1 is launched is between inner chamber body 3 and outer chamber 2
Through hole on isolation boundary with holes forms the light current magnetic area that microwave source incided in inner chamber body 3 after multiple reflections and heat and put
It is placed in the heating target of light current field region；After intercoupling and interfere between the microwave source of enormous amount, greatly reduce
The area size of cold spot and focus.
Mode stirrer is provided between outer chamber 2 and inner chamber body 3 to increase electromagnetic field on strong-electromagnetic field region and border
Reflection.
Described isolation boundary with holes is metal material using not wave transparent exotic material, described not wave transparent exotic material
Material or the material being made up of light material internal layer and metal surface.
Described isolation boundary surface configuration with holes is plane or complex-curved；Isolation boundary with holes can be single border
Or by multiple single boundary combinations into polygon cavity；The status requirement of isolation boundary with holes is not parallel to nearest microwave
Resonant cavity wall, the required distance minimum value of itself and microwave resonance cavity wall is 1/4 wavelength, and maximum is 4 wavelength；
Isolation boundary with holes uses welding, riveting, screw thread with wall, support column or hinge to connect in the fixing means of microwave resonance intracavitary
Connect mechanical connection or splicing, the on-mechanical connection of electromagnetic adsorption class of class；The support column or hinge class connecting material used is non-
Metal material；Hole is shaped as rectangle on isolation boundary with holes, and waist type is circular and cross；Perforate on isolation boundary with holes
Size increases with increasing with the distance of antenna for radiating microwave, and the diameter or length in hole are not less than electromagnetic field wavelength in cavity
1/4, Kong Yukong between beeline equally be not less than electromagnetic field wavelength 1/4；The arragement direction in hole can single direction arrangement
Multidirectional it can also arrange.
Beneficial effects of the present invention：
The present invention proposes that a kind of new thinking solves the uneven problem of microwave resonance intracavitary electromagnetic field, significantly improves in cavity
The uniformity of electromagnetic field.Realize that heating member overall temperature difference is no more than 3 degrees Celsius of excellent uniform temperature, temperature homogeneity improves 20 times
More than.
Brief description of the drawings
Fig. 1 is the resonant cavity structural representation of the present invention.
Fig. 2 is through hole schematic diagram on the inner chamber body wall of the present invention.
In figure：1 it is antenna assembly, 2 be outer chamber, 3 is inner chamber body.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
Embodiment one.
As shown in Figure 1-2.
A kind of method that can improve microwave cavity magnetic distribution uniformity, by setting band in microwave resonance cavity
Hole isolation boundary, strong-electromagnetic field region and light current field region, the electromagnetism of light current field region are separated into by microwave resonance cavity
After both border multiple reflections, light current magnetic is incided via the hole on isolation boundary with holes by the electromagnetic field of strong field in field
Region；Formed on isolation boundary hole after intercoupling and interfere between microwave source, the microwave source of enormous amount heating be positioned over it is weak
The heating target of electromagnetic field, greatly reduces the area size of cold spot and focus, so as to improve microwave resonance intracavitary electricity
Distribution of Magnetic Field uniformity；Cold spot characterizes magnetic distribution uneven in cavity with focus, and cold spot is the node of standing wave, focus
For the antinode of standing wave.It can be existed to further improve uniformity in strong-electromagnetic field region increase mode stirrer with increasing electromagnetic field
Strong-electromagnetic field region and the reflection on border.Described isolation boundary with holes using not wave transparent exotic material such as metal material or by
The material of light material internal layer and metal surface composition.Described isolation boundary surface configuration with holes is plane or complex-curved；
Isolation boundary with holes can for single border or by multiple single boundary combinations into polygon cavity；Isolation boundary with holes
Status requirement is not parallel to nearest microwave resonance cavity wall, and the required distance minimum value of itself and microwave resonance cavity wall is
1/4 wavelength, maximum is 4 wavelength；Isolation boundary with holes is used and wall, support in the fixing means of microwave resonance intracavitary
Welding, riveting, the mechanical connection for being threadedly coupled class or the splicing of post or hinge, the on-mechanical connection of electromagnetic adsorption class；Use
Support column or hinge class connecting material are nonmetallic materials；Hole is shaped as rectangle, waist type, circle and ten on isolation boundary with holes
Font；Bore size on isolation boundary with holes increases with increasing with the distance of antenna for radiating microwave, and the diameter in hole or
Length is equally not less than the 1/4 of electromagnetic field wavelength not less than beeline between 1/4, Kong Yukong of electromagnetic field wavelength in cavity；
The arragement direction in hole can single direction arrangement multidirectional can also arrange.Multichannel microwave day is set in microwave resonance cavity outside wall surface
Line apparatus；Microwave generating apparatus launches microwave, and by radiating antenna or microwave resonance cavity contact position coupling device to
Inside cavity feed-in microwave, its power can individually control that control also can be combined；Microwave frequency range is 300MHz~300GHz；It is micro-
Wave frequency rate can immobilize or linearly or nonlinearly change according to more than 20MHz scope；Microwave aerial assembly can be waveguide
One or more in leaky antenna, flagpole antenna, circular loop antenna, spiral antenna, electromagnetic horn or microstrip antenna.
Specific to Fig. 1,2 and side, key of the invention be inside outer chamber 2 placement one layer of wall group as shown in Figure 2
The inner chamber body 3 closed.The weak region in region and electromagnetic field that whole cavity is divided into electromagnetic field intensity by inner chamber body 3.Microwave is from outer
Antenna assembly 1 on cavity 2 is incided on the wall of inner chamber body 3, and intensive microbeam becomes via inside and outside cavity wall multiple reflections
It must disperse, then scattered microwave incides light current field region via the hole on the wall of inner chamber body 3, and heats heated pair
As.
The microwave curing frequency that this example is used is 2450 ± 30MHz.It is galss fiber reinforced resin base to be heated object
Composite, size is 500mm*500mm.Antenna assembly 1 uses leaky antenna in this example.The interior section of outer chamber 2 is using just
Heptagon, and a wall of the intersection just to inner chamber body 3 of 2 liang of walls of outer chamber.The length of side of outer chamber 2 is 1m, inner chamber body 2
The length of side is 0.8m.The central shaft difference of interior outer chamber is no more than 5mm.The epithyrid of inner chamber body 3 uses round rectangle hole, such as Fig. 2 institutes
Show.Its length and width is respectively 3cm and 1cm.Adjacent round rectangle hole centre-to-centre spacing is not less than 6cm.In addition, on outer chamber 2
Antenna assembly 1, the size in round rectangle hole is bigger, and farthest round rectangle hole length and width is respectively 6cm and 2cm.
Microwave source is connected with microwave transmission antenna, and the other end of microwave transmission line is connected with leaky antenna, microwave
Produced, be radiated to by leaky antenna in outer chamber 2 by microwave source.The hole eventually passed through in inner chamber body 3 is radiated glass
Glass fiber-reinforced resin matrix compound material.Test result indicates that, compared to original cavity design method, galss fiber reinforced resin
Based composites surface maximum temperature difference is reduced to 3 DEG C from original 25 DEG C, and the temperature for significantly improving material microwave heating is uniform
Property.
Embodiment two.
As shown in Figure 1-2.
A kind of to improve the microwave resonance cavity of microwave cavity magnetic distribution uniformity, it includes polygon outer chamber
2, as shown in figure 1, microwave aerial assembly 1 is arranged on described outer chamber 2, it is with holes provided with as shown in Figure 2 in outer chamber 2
The inner chamber body 3 of isolation boundary composition, heating target is arranged in inner chamber body 3；The microwave that microwave aerial assembly 1 is launched is in inner chamber body
Between 3 and outer chamber 2 after multiple reflections through hole on isolation boundary with holes formed microwave source incide it is weak in inner chamber body 3
Heat the heating target for being positioned over light current field region in electromagnetic spectrum；The microwave source of enormous amount（Hundreds and thousands of）Between mutually
After coupling and interference, the area size of cold spot and focus is greatly reduced.When it is implemented, can also be in outer chamber 2 and inner chamber
Agitator is set to increase reflecting effect of the electromagnetic field in strong-electromagnetic field region and border between body 3.Described isolated border with holes
Boundary should be using not wave transparent exotic material, such as metal material or the material being made up of light material internal layer and metal surface.It is with holes
Isolation boundary surface configuration can be plane or complex-curved；Isolation boundary with holes can be for single border or by multiple single borders
The polygon cavity being combined into；The status requirement of isolation boundary with holes is not parallel to nearest microwave resonance cavity wall, its
Required distance minimum value with microwave resonance cavity wall is 1/4 wavelength, and maximum is 4 wavelength；Isolation boundary with holes exists
The fixing means of microwave resonance intracavitary is used and the welding of wall, support column or hinge, riveting, the mechanical connection for being threadedly coupled class
Or splicing, the on-mechanical connection of electromagnetic adsorption class；The support column or hinge class connecting material used is nonmetallic materials；It is with holes every
Rectangle is shaped as from hole on border, waist type is circular and cross；Bore size on isolation boundary with holes with microwave spoke
Penetrate the distance increase of antenna and increase, and between 1/4, the Kong Yukong of diameter or length not less than electromagnetic field wavelength in cavity in hole
Beeline is equally not less than the 1/4 of electromagnetic field wavelength；The arragement direction in hole can single direction arrangement multidirectional can also arrange.
The present invention operation principle be：
Multiple strong-electromagnetic field regions and light current field region are set in microwave resonance cavity, and different zones are by isolation boundary with holes
Separate, the electromagnetic field of light current field region by strong field electromagnetic field feed-in after both border multiple reflections.Isolation
The huge hole of boundary number is converted to new microwave source, launches microwave.Hole microwave source intercouples and interfered so that original
Cold spot in resonator is substantially reduced with spot size and mutual spacing distance, significantly improves the equal of electromagnetic field in resonator
Even property.
It the above is only the concrete application example of the present invention, protection scope of the present invention be not limited in any way.It is all to use
Technical scheme formed by equivalents or equivalence replacement, all falls within rights protection scope of the present invention.
Part that the present invention does not relate to is same as the prior art or can be realized using prior art.
Claims (4)
1. a kind of microwave cavity body method for improving magnetic distribution uniformity, it is characterised in that：In microwave resonance cavity
Multiple strong-electromagnetic field regions and light current field region are set, and different zones are separated by isolation boundary with holes, light current field region
Electromagnetic field by strong field electromagnetic field feed-in after both border multiple reflections, heating be positioned over light current field region
Heating target.
2. the method as described in claim 1, it is characterised in that：The isolation boundary with holes is using not electromagnetic wave transparent material, such as metal
Material.
3. the method as described in claim 1, it is characterised in that：The length in hole is not less than in cavity on the isolation boundary with holes
The 1/4 of electromagnetic field wavelength, and beeline is equally not less than the 1/4 of electromagnetic field wavelength between Kong Yukong.
4. a kind of can improve the microwave resonance cavity of microwave cavity magnetic distribution uniformity, it is characterized in that it includes polygon
Outer chamber（2）, microwave aerial assembly（1）Installed in described outer chamber（2）On, in outer chamber（2）In be provided with by isolation with holes
The inner chamber body of border composition（3）, heating target is installed in inner chamber body（3）In；Microwave aerial assembly（1）The microwave of transmitting is in inner chamber
Body（3）And outer chamber（2）Between form microwave source through hole on isolation boundary with holes after multiple reflections and incide inner chamber body
（3）In the heating of light current magnetic area be positioned over the heating target of light current field region；After intercoupling and interfere between microwave source,
Reduce the area size of cold spot and focus.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108366446A (en) * | 2018-04-13 | 2018-08-03 | 南京航空航天大学 | Microwave heating temperature field control method based on electromagnetic fiele |
| CN109655446A (en) * | 2019-01-22 | 2019-04-19 | 重庆大学 | A kind of △ type resonant cavity improving gas Raman intensity/integrating sphere joint enhancing chamber |
| CN113766689A (en) * | 2021-09-22 | 2021-12-07 | 四川大学 | Microwave heating structure, method and system |
| WO2023193693A1 (en) * | 2022-04-07 | 2023-10-12 | 湖南大学 | Method for improving uniformity of electromagnetic fields inside static microwave resonant cavity |
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| CN202374485U (en) * | 2011-12-20 | 2012-08-08 | 湖南省中晟热能科技有限公司 | Slot antenna for microwave furnace |
| CN103587130A (en) * | 2013-10-15 | 2014-02-19 | 南京航空航天大学 | Method and device for curing fiber-reinforced resin-based composite material component by utilizing microwaves |
| CN105655724A (en) * | 2016-03-07 | 2016-06-08 | 南京航空航天大学 | Microwave antenna for composite material microwave solidification |
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| CN101127413A (en) * | 2007-08-21 | 2008-02-20 | 西安电子科技大学 | Microwave resonance cavity |
| CN202374485U (en) * | 2011-12-20 | 2012-08-08 | 湖南省中晟热能科技有限公司 | Slot antenna for microwave furnace |
| CN103587130A (en) * | 2013-10-15 | 2014-02-19 | 南京航空航天大学 | Method and device for curing fiber-reinforced resin-based composite material component by utilizing microwaves |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108366446A (en) * | 2018-04-13 | 2018-08-03 | 南京航空航天大学 | Microwave heating temperature field control method based on electromagnetic fiele |
| CN109655446A (en) * | 2019-01-22 | 2019-04-19 | 重庆大学 | A kind of △ type resonant cavity improving gas Raman intensity/integrating sphere joint enhancing chamber |
| CN109655446B (en) * | 2019-01-22 | 2021-03-30 | 重庆大学 | Triangular resonant cavity/integrating sphere combined enhancement cavity for improving gas Raman intensity |
| CN113766689A (en) * | 2021-09-22 | 2021-12-07 | 四川大学 | Microwave heating structure, method and system |
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| WO2023193693A1 (en) * | 2022-04-07 | 2023-10-12 | 湖南大学 | Method for improving uniformity of electromagnetic fields inside static microwave resonant cavity |
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