CN104494028A - Method for improving distribution uniformity of composite microwave curing electromagnetic field - Google Patents
Method for improving distribution uniformity of composite microwave curing electromagnetic field Download PDFInfo
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- CN104494028A CN104494028A CN201410780209.4A CN201410780209A CN104494028A CN 104494028 A CN104494028 A CN 104494028A CN 201410780209 A CN201410780209 A CN 201410780209A CN 104494028 A CN104494028 A CN 104494028A
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Abstract
The invention discloses a method for improving the distribution uniformity of a composite microwave curing electromagnetic field. The method is characterized in that the distribution uniformity of microwaves in a resonant cavity is improved by adopting a method of changing the morphology of the wall surface of the interior of the resonant cavity, a non-smooth surface is adopted as the wall surface of the interior of the resonant cavity, or a reflection ball is placed on the surface of the resonant cavity so that normal tangent lines of all adjacent points on the wall surface of the interior of the resonant cavity are not parallel. Microwaves emitted from a microwave source enter the closed resonant cavity, and because reflection directions are not consistent, dense microwave beams are dispersed by virtue of reflection of the wall surface of the interior of the resonant cavity. The composite material member is placed in the closed resonant cavity, and when the microwaves irradiate the surface of the composite material member, the microwaves absorbed by the surface of the composite material member are relatively uniform. According to the method, the problem of non-uniformity of distribution of the electromagnetic field, which is generated by non-uniformity of radiation of the microwave source is solved, the temperature distribution uniformity of the composite material member, is improved, the deformation of the composite material member is reduced, and the performance of the composite material member is improved.
Description
Technical field
The present invention relates to a kind of composite material solidification technology, especially a kind of technology utilizing heating using microwave to be cured composite, specifically a kind of method improving Composite Microwave solidification magnetic distribution uniformity.
Background technology
Microwave has that firing rate is fast, temperature is easy to control, low, the selective heating of energy consumption, can carries out the advantage such as heating to large-scale and thicker complex structural member, is applied widely at industrial circle and sphere of life.
But heating objects with microwaves has the shortcoming of inhomogeneities, this is the Main Bottleneck of restriction heating using microwave development.Affect heating using microwave uniformity because have two, a kind of is the physical property of heating object itself, as dielectric properties.Another kind is the uniformity of magnetic distribution in resonator.Improve the uniformity of magnetic distribution in resonator, traditional way has the method such as metal rotation fan page and multiple microwave delivery outlets.But these methods all cannot effectively improve even microwave distribution in cavity.
Summary of the invention
The object of the invention is the problem for affecting solidification effect during existing macro cured composite material because magnetic distribution in resonator is uneven, during according to Maxwell's Theory of Electromagnetic Field and microwave irradiation to metal surface, major part microwave is all reflected, angle of reflection equals incidence angle, and dump energy is in the decay of penetrating metal process Exponential, invent a kind of method that pattern by changing intra resonant cavity wall improves even microwave distribution.
Technical scheme of the present invention is:
Improve a method for Composite Microwave solidification magnetic distribution uniformity, it is characterized in that: the inner wall of resonant cavity adopts non-smooth surface, or places reflection sphere on resonator surface, makes intra resonant cavity wall adjacent spots method phase tangent line all not parallel; The microwave that microwave source is launched incides in above-mentioned airtight resonator, and because reflection direction is inconsistent, intensive microbeam becomes dispersion through the reflection of intra resonant cavity wall; Composite element is placed in above-mentioned airtight resonator, and when microwave irradiation is to composite product surface, the microwave of composite element Surface absorption is more even, reduces the deflection of composite product.
Intra resonant cavity wall adopts non-smooth surface, and surface irregularity degree is not less than 1/10 of microwave wavelength; Non-smooth surface adopts the material that almost can be totally reflected impinging microwave, and its arrangement mode is symmetrical structure or asymmetric distribution structure.
The minimum profile curvature radius of reflection sphere is not less than 1/2 of impinging microwave wavelength; Reflection sphere is made up of light material internal layer and metal coating two parts, and reflection sphere adopts semiglobe, and the sphere of hemisphere points to resonator, and the plane of hemisphere is close to and is sheltered the chamber wall that shakes.
Magnetic Attraction block is inlayed in reflection sphere; Reflection sphere is adsorbed on the wall of resonator by magnetic block; Reflection sphere surface metal coating and intra resonant cavity wall conduct, and resonator wall ground connection, derives charge inducing.
Arrangement and the control method of reflection sphere are as follows: when between the electromagnetic field field intensity crest in resonator with trough, phase difference is not less than 3000V/m, the position of accommodation reflex ball and size improve microwave field distribution uniformity; When microwave field density compared with average field-strength in cavity lower than 10% time, more than 10% is reduced apart from the reflection sphere sum of nearest wall to its regional center, when microwave field density compared with average field-strength in cavity lower than 20% time, more than 20% is reduced apart from the reflection sphere sum of nearest wall to its regional center, the rest may be inferred, and the reflection sphere quantity of other walls is constant; When microwave field field intensity is still lower than averaged microwave field field intensity, change the reflection sphere that radius of curvature is less than microwave wavelength 1/4; When microwave field density compared with average field-strength in cavity high about 10% time, more than 10% is increased apart from the reflection sphere of nearest wall to its regional center, when microwave field density compared with average field-strength in cavity high about 20% time, more than 20% is increased apart from the reflection sphere of nearest wall to its regional center, the rest may be inferred, and the reflection sphere quantity of other walls is constant; When microwave field field intensity is still higher than averaged microwave field field intensity, change the reflection sphere that radius of curvature is larger, reflection sphere curvature is greater than 1/4 of microwave wavelength.
The invention has the beneficial effects as follows:
The present invention can improve the uniformity of microwave in whole microwave resonance cavity.
The present invention can realize the complex-curved and temperature distribution evenness of composite element in microwave curing process that be structure.
Accompanying drawing explanation
Fig. 1 is that schematic cross-section placed by intra resonant cavity reflection sphere of the present invention.
Fig. 2 is intra resonant cavity Non-smooth surface wall schematic diagram of the present invention.
In figure: 1 is intra resonant cavity wall, and 2 is reflection spheres, and 3 is resonators, and 4 is non-smooth surfaces.
Detailed description of the invention
The present invention is further illustrated for Structure Figure and embodiment below.
As shown in Figure 1-2.
A kind of method improving Composite Microwave solidification magnetic distribution uniformity, its key makes the inner wall 1 of resonant cavity adopt the non-smooth surface 4 shown in Fig. 2, or the method shown in employing Fig. 1, place reflection sphere 2 at intra resonant cavity wall 1, make intra resonant cavity wall 1 adjacent spots normal tangent all not parallel.The microwave that microwave source is launched incides in above-mentioned airtight resonator 3, and because reflection direction is inconsistent, intensive microbeam becomes dispersion through the reflection of intra resonant cavity wall 1.Composite element is placed in above-mentioned airtight resonator 3 after vacuum pressed, and when microwave irradiation is to composite element surface, the microwave of composite element Surface absorption is more even.
Above-mentioned microwave field derives from the adjustable microwave source of a power linear, and the frequency range of its microwave comprises: 300MHz to 300GHz.The non-smooth surface 4 that intra resonant cavity wall 1 adopts, surface irregularity degree is not less than 1/10 of input microwave wavelength.Non-smooth surface 4 adopts the material (as metal coating) that can be totally reflected impinging microwave.
The minimum profile curvature radius of reflection sphere 2 of the present invention is not less than 1/2 of impinging microwave wavelength.Reflection sphere 2 adopts two parts to form, and is respectively the hemisphere (as foam hemisphere, plastics hemisphere) of inner light material and outside conductive coating.Reflection sphere also can adopt hollow or solid metal hemisphere.The shape of reflection sphere 2 also can adopt the solid of other surperficial each point normal direction changes.For the ease of the location of reflection sphere in resonator 3, magnetic contiguous block can be inlayed in reflection sphere 2.Reflection sphere is adsorbed on the wall 1 of resonator by magnetic contiguous block.Reflection sphere 2 surface metal coating and intra resonant cavity wall 1 conduct.Closely arrange between reflection sphere 2.During concrete enforcement, reflection sphere 2, also by pasting, being welded on the first-class method of metallic plate and being placed on intra resonant cavity wall 1, realizes changing reflection sphere 2 by changing conductive plate.Based on Maxwell's Theory of Electromagnetic Field, angle of reflection equals incidence angle.Simultaneously in resonator, along with the increase of hole, the probability that microwave shines intra resonant cavity wall 1 increases, and reflect more concentrated, close microwave field density is stronger.When reflection sphere 2 radius is less than microwave wavelength, along with the radius of curvature of reflection sphere 2 is larger, electromagnetic angle of reflection and incidence angle angle larger, degree of scatter is higher, and close microwave field density is more weak.
When phase difference is not less than 3000V/m between the electromagnetic field field intensity crest in resonator with trough, improve the distributing homogeneity of microwave field by the position of accommodation reflex ball and size.When detect the microwave field density of certain compared with average field-strength in cavity low about 10% time, to its regional center apart from nearest wall reflection sphere sum reduce more than 10%, low by 20%, reduce more than 20%, the rest may be inferred, and the reflection sphere quantity of other walls is constant.When microwave field field intensity is still lower than averaged microwave field field intensity, the reflection sphere being less than microwave wavelength 1/4 by changing radius of curvature solves the problems referred to above.When detect the microwave field density of certain compared with average field-strength in cavity high about 10% time, can will to its regional center apart from nearest wall reflection sphere increase by more than 10%, high by 20%, increase by more than 20%, the rest may be inferred, and the reflection sphere quantity of other walls is constant.When microwave field field intensity is still higher than averaged microwave field field intensity, change the reflection sphere that radius of curvature is larger, the reflection sphere adopting reflection sphere curvature to be greater than 1/4 of microwave wavelength solves above problem.Reflection sphere can be non-uniform Distribution mode.
Example.
The microwave frequency that this example adopts is 2450 ± 30MHz.Microwave source is connected with microwave transmission line, and other one end of microwave transmission line is connected with antenna for radiating microwave.Microwave is radiated quadrangle resonator 3 by antenna for radiating microwave.Wherein, resonator 3 length of side 1m.Reflection sphere 2 radius is 4cm.Reflection sphere 2 inner core adopts high-temperature resistance plastice hemisphere, as polyimides hemisphere, layer of metal film is plated at polyimides all surface by electric plating method, copper is adopted to be metal film in this example, inlay the magnetic material with electric conductivity in polyimides hemisphere, in this example, adopt neodymium iron boron to be magnetic material.The cross section of reflection sphere is parallel with magnetic material face, and reflection sphere is adsorbed on the wall of resonator by magnetic material, and reflection sphere 2 cross section abuts against on intra resonant cavity wall 1 to prevent lossy microwave.Reflection sphere 2 is closely arranged on intra resonant cavity wall 1.When the field intensity crest of microwave field is with when differing 3000V/m between trough, the position of accommodation reflex ball 2 and size improve microwave field distribution uniformity further.Regulate the method for even microwave distribution as follows: when microwave field density is lower than averaged microwave field field intensity 1500 V/m, on its nearest wall area, to reduce by 5 reflection spheres.When microwave field field intensity is still lower than averaged microwave field field intensity 1500V/m, change the reflection sphere that radius of curvature is 1/10 wavelength.Reflection sphere range of curvature radius is 1/10 of microwave wavelength.When microwave field density is higher than averaged microwave field field intensity 1500 V/m, its nearest wall area, increases by 5 reflection spheres 2.Space subsequently between accommodation reflex ball 2, space scope is 1/8 to 2 of microwave wavelength.When microwave field field intensity is still higher than averaged microwave field field intensity 1500V/m, change the reflection sphere that radius of curvature is 1/2 wavelength.Through experimental verification, the magnetic distribution uniformity of this kind of method acquisition does not adopt the method for reflection sphere to improve more than 50%.
For cavity Non-smooth surface wall, this example adopts 2.45GHz microwave, and the distance between two adjacent high spots of wall is 1/4 wavelength 3cm, and convex paddy differs 1/6 wavelength with the height of trench, 2cm.Distribution mode is symmetrical.As calculated and experimental verification, the magnetic distribution uniformity that this kind of method obtains does not adopt the method for Non-smooth surface wall to improve more than 40%.
Below be only embody rule example of the present invention, protection scope of the present invention is not constituted any limitation.The technical scheme that all employing equivalents or equivalence are replaced and formed, all drops within rights protection scope of the present invention.
Part that the present invention does not relate to is same as the prior art maybe can adopt constructed realization.
Claims (5)
1. one kind is improved the method for Composite Microwave solidification magnetic distribution uniformity, it is characterized in that: the inner wall of resonant cavity adopts non-smooth surface, or place reflection sphere on resonator surface, make intra resonant cavity wall adjacent spots method phase tangent line all not parallel; The microwave that microwave source is launched incides in above-mentioned airtight resonator, and because reflection direction is inconsistent, intensive microbeam becomes dispersion through the reflection of intra resonant cavity wall; Composite element is placed in above-mentioned airtight resonator, and when microwave irradiation is to composite product surface, the microwave of composite element Surface absorption is more even, reduces the deflection of composite product.
2. the method for claim 1, is characterized in that: intra resonant cavity wall adopts non-smooth surface, and surface irregularity degree is not less than 1/10 of microwave wavelength; Non-smooth surface adopts the material that almost can be totally reflected impinging microwave, and its arrangement mode is symmetrical structure or asymmetric distribution structure.
3. the method for claim 1, is characterized in that: the minimum profile curvature radius of reflection sphere is not less than 1/2 of impinging microwave wavelength; Reflection sphere is made up of light material internal layer and metal coating two parts, and reflection sphere adopts semiglobe, and the sphere of hemisphere points to resonator, and the plane of hemisphere is close to and is sheltered the chamber wall that shakes.
4. the method for claim 1, is characterized in that: in reflection sphere, inlay magnetic Attraction block; Reflection sphere is adsorbed on the wall of resonator by magnetic block; Reflection sphere surface metal coating and intra resonant cavity wall conduct, and resonator wall ground connection, derives charge inducing.
5. the method for claim 1, it is characterized in that: arrangement and the control method of reflection sphere are as follows: when between the electromagnetic field field intensity crest in resonator with trough, phase difference is not less than 3000V/m, the position of accommodation reflex ball and size improve microwave field distribution uniformity; When microwave field density compared with average field-strength in cavity lower than 10% time, more than 10% is reduced apart from the reflection sphere sum of nearest wall to its regional center, when microwave field density compared with average field-strength in cavity lower than 20% time, more than 20% is reduced apart from the reflection sphere sum of nearest wall to its regional center, the rest may be inferred, and the reflection sphere quantity of other walls is constant; When microwave field field intensity is still lower than averaged microwave field field intensity, change the reflection sphere that radius of curvature is less than microwave wavelength 1/4; When microwave field density compared with average field-strength in cavity high about 10% time, more than 10% is increased apart from the reflection sphere of nearest wall to its regional center, when microwave field density compared with average field-strength in cavity high about 20% time, more than 20% is increased apart from the reflection sphere of nearest wall to its regional center, the rest may be inferred, and the reflection sphere quantity of other walls is constant; When microwave field field intensity is still higher than averaged microwave field field intensity, change the reflection sphere that radius of curvature is larger, reflection sphere curvature is greater than 1/4 of microwave wavelength.
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Cited By (4)
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| CN107377533A (en) * | 2017-09-12 | 2017-11-24 | 深圳市华星光电半导体显示技术有限公司 | A kind of ultraviolet irradiation device |
| CN111578648A (en) * | 2019-02-19 | 2020-08-25 | 江苏食品药品职业技术学院 | Microwave heating type vacuum freeze dryer with multiple oscillation modes |
| CN114536617A (en) * | 2022-02-21 | 2022-05-27 | 昆明理工大学 | Method for improving microwave curing heating uniformity of carbon fiber composite material |
| CN114666932A (en) * | 2022-04-07 | 2022-06-24 | 湖南大学 | Method for improving uniformity of electromagnetic field in cavity of static microwave resonant cavity |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114536617A (en) * | 2022-02-21 | 2022-05-27 | 昆明理工大学 | Method for improving microwave curing heating uniformity of carbon fiber composite material |
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| CN114666932B (en) * | 2022-04-07 | 2022-11-18 | 湖南大学 | Method for improving uniformity of electromagnetic field in cavity of static microwave resonant cavity |
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