CN104494028B - A kind of method improving Composite Microwave solidification magnetic distribution uniformity - Google Patents
A kind of method improving Composite Microwave solidification magnetic distribution uniformity Download PDFInfo
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- CN104494028B CN104494028B CN201410780209.4A CN201410780209A CN104494028B CN 104494028 B CN104494028 B CN 104494028B CN 201410780209 A CN201410780209 A CN 201410780209A CN 104494028 B CN104494028 B CN 104494028B
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Abstract
A kind of method improving Composite Microwave solidification magnetic distribution uniformity, it is characterized in that the even microwave distribution improving in resonant cavity by the method changing intra resonant cavity wall pattern, the internal wall of resonant cavity uses non-smooth surface, or place reflection sphere on resonator cavity surface, make intra resonant cavity wall adjacent spots normal tangent the most not parallel.The microwave that microwave source is launched incides in above-mentioned airtight resonator cavity, and owing to 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 cavity, and during microwave irradiation to composite product surface, the microwave of composite element Surface absorption is more uniform.The present invention solves magnetic distribution problem of non-uniform that is uneven due to microwave source radiation and that produce, improves composite element temperature distribution evenness, reduces the deflection of composite product, improves the performance of product.
Description
Technical field
The present invention relates to a kind of composite curing technology, a kind of technology utilizing microwave heating that composite is solidified, a kind of method improving Composite Microwave solidification magnetic distribution uniformity.
Background technology
Microwave has that firing rate is fast, temperature is easily controllable, energy consumption is low, selectivity heating, large-scale and thicker complex structural member can carry out the advantages such as heating, 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 limiting microwave heating development.Affect microwave heating uniformity because have two, a kind of is the physical property of heating object itself, such as dielectric properties.Another kind is the uniformity of magnetic distribution in resonator cavity.The uniformity of magnetic distribution in raising resonator cavity, traditional way has the method such as metal rotation fan page and multiple microwave delivery outlets.But these methods all cannot be effectively improved even microwave distribution in cavity.
Summary of the invention
It is an object of the invention to for during existing macro solidification composite because in resonator cavity, magnetic distribution is uneven the problem that affects solidification effect, during according to Maxwell's Theory of Electromagnetic Field i.e. microwave irradiation to metal surface, major part microwave is all reflected, angle of reflection is equal to angle of incidence, and dump energy is exponential damping during penetrating metal, invent a kind of by changing the method that the pattern of intra resonant cavity wall improves even microwave distribution.
The technical scheme is that
A kind of method improving Composite Microwave solidification magnetic distribution uniformity, it is characterised in that: the internal wall of resonant cavity uses non-smooth surface, or places reflection sphere on resonator cavity surface, makes intra resonant cavity wall adjacent spots method phase tangent line the most not parallel；The microwave that microwave source is launched incides in above-mentioned airtight resonator cavity, and owing to 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 cavity, and during microwave irradiation to composite product surface, the microwave of composite element Surface absorption is more uniform, reduces the deflection of composite product.
Intra resonant cavity wall uses non-smooth surface, and surface irregularity degree is not less than the 1/10 of microwave wavelength；Non-smooth surface uses the material that can almost 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 the 1/2 of impinging microwave wavelength；Reflection sphere is made up of light material internal layer and metal coating two parts, and reflection sphere uses semiglobe, and the sphere of hemisphere points to resonator cavity, and the plane of hemisphere is close to shelter cavity wall of shaking.
Magnetic Attraction block is inlayed in reflection sphere；Reflection sphere is adsorbed on the wall of resonator cavity by magnetic block；Reflection sphere surface metal coating conducts with intra resonant cavity wall, resonator cavity wall ground connection, is derived by charge inducing.
Arrangement and the control method of reflection sphere are as follows: when between electromagnetic field field intensity crest and the trough in resonator cavity, phase difference is not less than 3000V/m, and position and the size of regulation reflection sphere improve microwave field distribution uniformity；When microwave field density compared with average field-strength in cavity less 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 less 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 less than averaged microwave field field intensity, change the radius of curvature reflection sphere 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, changing the reflection sphere that radius of curvature is bigger, reflection sphere curvature is more than the 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 cavity body.
The present invention is capable of the composite element of complex-curved and structure temperature distribution evenness during microwave curing.
Accompanying drawing explanation
Fig. 1 is that schematic cross-section placed by the intra resonant cavity reflection sphere of the present invention.
Fig. 2 is the 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 sphere, and 3 is resonator cavity, and 4 is non-smooth surface.
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, it is critical that the internal wall 1 of resonant cavity uses 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 the most not parallel.The microwave that microwave source is launched incides in above-mentioned airtight resonator cavity 3, and owing to 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 cavity 3 after vacuum pressed, and when microwave irradiation to composite element surface, the microwave of composite element Surface absorption is more uniform.
Above-mentioned microwave field derives from an adjustable microwave source of power linear, and the frequency range of its microwave includes: 300MHz to 300GHz.The non-smooth surface 4 that intra resonant cavity wall 1 uses, surface irregularity degree is not less than the 1/10 of input microwave wavelength.Non-smooth surface 4 uses the material (such as metal coating) that can be totally reflected impinging microwave.
The minimum profile curvature radius of the reflection sphere 2 of the present invention is not less than the 1/2 of impinging microwave wavelength.Reflection sphere 2 uses two parts to form, and is respectively the hemisphere (such as foam hemisphere, plastics hemisphere) of internal light material and outside conductive coating.Reflection sphere may be used without hollow or solid metal hemisphere.The shape of reflection sphere 2 may be used without the solid of other surface each point normal direction changes.For the ease of reflection sphere location in resonator cavity 3, magnetic contiguous block can be inlayed in reflection sphere 2.Reflection sphere is adsorbed on the wall 1 of resonator cavity by magnetic contiguous block.Reflection sphere 2 surface metal coating conducts with intra resonant cavity wall 1.Closely arrange between reflection sphere 2.When being embodied as, reflection sphere 2 also can be placed on intra resonant cavity wall 1 by pasting, being welded on the first-class method of metallic plate, realizes changing reflection sphere 2 by changing conductive plate.Based on Maxwell's Theory of Electromagnetic Field, angle of reflection is equal to angle of incidence.Simultaneously in resonator cavity, along with the increase of hole, microwave shines the probability of intra resonant cavity wall 1 and increases, and reflection is more concentrated, and close microwave field density is higher.When reflection sphere 2 radius is less than microwave wavelength, along with the radius of curvature of reflection sphere 2 is the biggest, the angle of reflection of electromagnetic wave is the biggest with angle of incidence angle, and degree of scatter is the highest, and close microwave field density is the most weak.
When phase difference is not less than 3000V/m between electromagnetic field field intensity crest and the trough in resonator cavity, the distributing homogeneity of microwave field can be improved by the position of regulation reflection sphere and size.When detect the microwave field density of certain compared with average field-strength in cavity low about 10% time, reduce more than 10% to its regional center apart from the reflection sphere sum of nearest wall, 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 less than averaged microwave field field intensity, the problems referred to above can be solved by changing radius of curvature less than the reflection sphere of microwave wavelength 1/4.When detect the microwave field density of certain compared with average field-strength in cavity high about 10% time, more than 10% can be increased to its regional center apart from the reflection sphere of nearest wall, 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 bigger, use the reflection sphere curvature reflection sphere more than the 1/4 of microwave wavelength to solve problem above.Reflection sphere can be non-uniform Distribution mode.
Example.
The microwave frequency that this example uses is 2450 ± 30MHz.Microwave source is connected with microwave transmission line, and the other end of microwave transmission line is connected with antenna for radiating microwave.Microwave is radiated tetragon resonator cavity 3 by antenna for radiating microwave.Wherein, resonator cavity 3 length of side 1m.Reflection sphere 2 radius is 4cm.Reflection sphere 2 inner core uses high-temperature resistance plastice hemisphere, such as polyimides hemisphere, layer of metal film is plated at polyimides all surface by electric plating method, using copper in this example is metal film, inlaying the magnetic material with electric conductivity in polyimides hemisphere, using neodymium iron boron in this example is magnetic material.The cross section of reflection sphere is parallel with magnetic material face, and reflection sphere is adsorbed on the wall of resonator cavity 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 differing 3000V/m between the field intensity crest and trough of microwave field, position and the size of regulation reflection sphere 2 improve microwave field distribution uniformity further.The method of regulation even microwave distribution is as follows: when microwave field density is less than averaged microwave field field intensity 1500 V/m, on its closest wall area, reduce by 5 reflection spheres.When microwave field field intensity is still less 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 the 1/10 of microwave wavelength.When microwave field density is higher than averaged microwave field field intensity 1500 V/m, its closest wall area, increase by 5 reflection spheres 2.Space between regulation reflection sphere 2 subsequently, space scope is the 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.Experiments verify that, the magnetic distribution uniformity of this kind of method acquisition is relatively provided without the method for reflection sphere and improves more than 50%.
For cavity Non-smooth surface wall, this example uses 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, 2cm with the height of trench.Distribution mode is symmetrical.Being computed and experimental verification, the magnetic distribution uniformity of this kind of method acquisition is relatively provided without the method for Non-smooth surface wall and improves more than 40%.
Below it is only the concrete exemplary applications 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, within the scope of all falling within rights protection of the present invention.
Part that the present invention does not relate to is same as the prior art maybe can use constructed realization.
Claims (4)
1. the method improving Composite Microwave solidification magnetic distribution uniformity, it is characterised in that: the internal wall of resonant cavity uses non-smooth surface, or places reflection sphere on resonator cavity surface, makes intra resonant cavity wall adjacent spots normal tangent the most not parallel；The microwave that microwave source is launched incides in above-mentioned airtight resonator cavity, and owing to 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 cavity, and during microwave irradiation to composite product surface, the microwave of composite element Surface absorption is more uniform, reduces the deflection of composite product；Arrangement and the control method of reflection sphere are as follows: when between electromagnetic field field intensity crest and the trough in resonator cavity, phase difference is not less than 3000V/m, and position and the size of regulation reflection sphere improve microwave field distribution uniformity；When microwave field density compared with average field-strength in cavity less than 10% time, 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 less than 20% time, 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 less than averaged microwave field field intensity, change the radius of curvature reflection sphere less than microwave wavelength 1/4；When microwave field density compared with average field-strength in cavity high 10% time, 10% is increased apart from the reflection sphere quantity of nearest wall to its regional center, when microwave field density compared with average field-strength in cavity high 20% time, 20% is increased apart from the reflection sphere quantity 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, changing the reflection sphere that radius of curvature is bigger, reflection sphere radius of curvature is more than the 1/4 of microwave wavelength.
2. the method for claim 1, it is characterised in that: intra resonant cavity wall uses non-smooth surface, and surface irregularity degree is not less than the 1/10 of microwave wavelength；Non-smooth surface uses the material that can almost be totally reflected impinging microwave, and its arrangement mode is symmetrical structure or asymmetric distribution structure.
3. the method for claim 1, it is characterised in that: the minimum profile curvature radius of reflection sphere is not less than the 1/2 of impinging microwave wavelength；Reflection sphere is made up of light material internal layer and metal coating two parts, and reflection sphere uses semiglobe, and the sphere of hemisphere points to resonator cavity, and the plane of hemisphere is close to resonance cavity wall.
4. the method for claim 1, it is characterised in that: in reflection sphere, inlay magnetic Attraction block；Reflection sphere is adsorbed on the wall of resonator cavity by magnetic block；Reflection sphere surface metal coating conducts with intra resonant cavity wall, resonator cavity wall ground connection, is derived by charge inducing.
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| CN111578648B (en) * | 2019-02-19 | 2022-12-23 | 江苏食品药品职业技术学院 | Microwave heating type vacuum freeze dryer with multiple oscillation modes |
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