CN201742593U - Microwave heating device with structural metamaterial - Google Patents
Microwave heating device with structural metamaterial Download PDFInfo
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- CN201742593U CN201742593U CN2010201091240U CN201020109124U CN201742593U CN 201742593 U CN201742593 U CN 201742593U CN 2010201091240 U CN2010201091240 U CN 2010201091240U CN 201020109124 U CN201020109124 U CN 201020109124U CN 201742593 U CN201742593 U CN 201742593U
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Abstract
The utility model relates to a microwave heating device with a structural metamaterial, which belongs to the technical field of microwave heating and comprises a microwave generating device and a microwave output device and also comprises the structural metamaterial (3) which is placed in front of the microwave output window of the microwave heating device through a support (4); the structural metamaterial is formed by compounding a metal graph layer (7) and a dielectric layer (8); the metal graph layer (7) is a single-layer or a multi-layer structure, is located on the surface of the dielectric layer (8) or embedded in the dielectric layer (8) and is formed by evenly distributed metal graph units; and each metal graph unit is formed into a rotary symmetrical structure by one or more than one metal sheet with the same shape and size. The utility model not only can effectively improve the microwave heating efficiency of a material at a specific position but also can effectively improve the microwave heating evenness, can reduce microwave leakage and reduce the microwave protection pressure.
Description
Technical field
The utility model belongs to the microwave heating technique field, relates to super clever materialogy, particularly microwave heating equipment.
Background technology
Microwave is meant that frequency is the electromagnetic wave of 300MHz-300GHz, promptly wavelength 1 meter (not containing 1 meter) electromagnetic wave between to 1 millimeter.The hydrone that is heated in the material is a polar molecule, and under fast-changing high-frequency electromagnetic the action of a magnetic field, its polarity orientation will change along with the variation of external electric field.The motion of molecule produces mutual friction effect, and this moment, the microwave field Conversion of energy was the heat energy in the medium.Microwave raises temperature of charge, thereby produces the purpose that thermalization and a series of materializing procedures such as expanded reach microwave heating.Device according to this principle manufacturing is exactly a microwave heating equipment.
Microwave is as a kind of advanced energy, in family, and industrial or agricultural, food, rubber, timber, fields such as medical treatment are widely used.The starting of microwave energy application technology and the beginning of the seventies in last century of China, main application fields has food, tobacco leaf, agricultural byproducts, light textile, the general drying and the processing of timber, and medical industry.To the middle and later periods nineties, China's household microwave oven industry emerges rapidly, and industrial microwave can application industry also enlarge rapidly.Microwave heating equipment has been applied to tobacco industry, the vulcanization of rubber, microwave sintering and smelting, microwave pollution treatment, microwave asphalt maintenance of surface, microwave chemical extraction, synthetic and clear up field such as technology.Microwave energy and microwave plasma have bigger development prospect at new material and microelectric technique for the high and new technology field that characterizes.And microwave applications products such as microwave sulfur lamp, microwave clothes drier, microwave water-heater, microwave dishwasher, though fully success as yet at present, be expected future soon some project form big industry.
Use microwave heating equipment to add thermal material and have following several main features:
One, penetrability.Microwave is used for the electromagnetic wave of radiation heating than other, and is longer as infrared ray, far infrared equiwavelength, therefore has better penetrability.When microwave penetrates medium, because the rising of the medium temperature that dielectric loss causes, make almost while heat temperature raising of dielectric material inside, outside, organizator thermal source state, shortened the conventional heat conduction time of pining for that adds greatly, and in condition is dielectric dissipation factor and medium temperature when being negative correlativing relation, material inside and outside homogeneous heating unanimity.
Two, selectivity heating.The ability of material absorbing microwave is mainly decided by its dielectric dissipation factor.The big material of dielectric dissipation factor is just strong to the absorbability of microwave, on the contrary, the ability of the material absorbing microwave that dielectric dissipation factor is little also a little less than.Because the loss factor of each material there are differences, microwave heating just shows the characteristics of selectivity heating.Belong to polar molecule as hydrone, dielectric constant is bigger, and its dielectric dissipation factor is also very big, and microwave is had strong absorbability.And the dielectric constant of protein, carbohydrate etc. is less relatively, and its absorbability to microwave is more much smaller than water.
Three, thermal inertia is little.Microwave is instantaneous heat temperature raising to dielectric material, and energy consumption is also very low.On the other hand, the power output of microwave is adjustable at any time, and the medium temperature rise changes thereupon, does not have the residual activity phenomenon, the needs that be highly advantageous to control automatically and serialization are produced.
It is strong to have above-mentioned penetrability just because of microwave heating, and the characteristics of selectivity heating, in case run into the requirement heating location near microwave source, or the low material of dielectric dissipation factor, a large amount of microwave energies can be low-loss by material to be heated, rather than absorbed by material and to be converted into heat and to add thermal material.This situation can cause microwave heating efficient low, and a large amount of wastes of microwave energy.
Super clever material is meant that nature does not exist, but the structure of making by manual method with special nature.The material design philosophy that super clever material is a kind of novelty, the basis of this thought are to break through the restriction of some apparent natural law by the design on multiple physical structure, thereby obtain extraordinary material function.Develop the super clever material that so far and comprise " left-handed materials ", photonic crystal, " super magnetic material " etc.The super clever material made from metal and medium can obtain the character different with the conventional media material.Under the uniform situation of electromagnetic wave incident equivalence, according to EFFECTIVE MEDIUM THEORY, λ=c/ γ, λ '=λ/n=c/n γ, wherein
Greater than 1 medium, near the microwave wavelength it is less than in a vacuum propagation wavelength for the effective dielectric constant real part.Adopt the design philosophy of super clever material, can obtain being different from the microwave transmission characteristic of general medium, thereby change near the microwave wavelength the super clever material, play the compression microwave field, the effect of concentrating microwaves energy.
Summary of the invention
The utility model provides a kind of microwave heating equipment with super clever structural material based on the design philosophy and the EFFECTIVE MEDIUM THEORY of super clever material.The microwave heating equipment that the utility model provides can focus on ad-hoc location with microwave energy, improves the microwave heating efficient of material, can also effectively improve the uniformity that microwave energy distributes, and reaches the purpose of rapid and uniform heating material.
Technical solutions of the utility model are as follows:
Microwave heating equipment with super clever structural material as shown in Figure 1 to Figure 3, comprises microwave generation device (being magnetron 1) and microwave output device (being waveguide or horn antenna 2); Also comprise super clever structural material 3, be placed on the microwave output window of microwave heating equipment by support 4 before.Described super clever structural material is composited by metal pattern layer 7 and dielectric layer 8; Described metal pattern layer 7 is the single or multiple lift structure and is arranged in dielectric layer 8 surfaces or is embedded into dielectric layer, and is made of equally distributed metallic pattern unit; Each metallic pattern unit constitutes rotational symmetry structure by one or more shapes with the identical sheet metal of size.
In the super clever structural material 3, the shape of described sheet metal can be rectangle, circle, Fang Huan, annulus, " ten " font, "
" font, or the rectangle that splits, circle, side's ring or annulus; The thickness h of sheet metal is greater than the microwave of the used metal material of the sheet metal peptide degree of depth that becomes; The real part of the complex dielectric permittivity of described dielectric layer panel material is less than 10, and imaginary part is less than 0.5, and concrete material can be to satisfy devitrified glass, tellite or the pottery etc. that complex dielectric permittivity requires.The thickness of whole super clever structural material 3 is advisable with 1/2nd wavelength that are no more than the work microwave.
The microwave energy that magnetron sends is by microwave output windows such as waveguide or horn antennas, and microwave energy can be radiated material to be heated surface more earlier through super clever structural material.Because super clever structural material has the single or multiple lift metallic pattern unit of symmetry or rotational symmetry structure, the real part of its equivalent complex dielectric permittivity is higher than the real part of complex dielectric permittivity in the vacuum, can shorten near the microwave wavelength of the super clever material of metal, play the compression microwave field, the effect of concentrating microwaves energy, thus reach the effect of using microwave Fast Heating assigned address.Simultaneously, super clever metallic pattern location equivalence on the super clever structural material is in the wavelet source of having introduced launched microwave in microwave heating equipment, microwave is radiated through super clever metallic pattern unit earlier again and adds on the thermal material, and the microwave energy on heating material surface distributes and just becomes more even.So, in microwave heating equipment, increase super clever structural material, can play microwave energy is gathered assigned address, effectively improve the efficient of microwave heating material, can also effectively improve the uniformity that material surface microwave energy distributes.By adjusting the structural parameters of super clever structural material, can change the position that microwave energy is assembled, adjust the penetration depth of microwave, also the design for microwave heating equipment provides a kind of simple and effective new way.Adopt the super clever structural material of different structure parameter, can on the basis of frequency that need not change magnetron output microwave and microwave heating equipment critical piece, satisfy the demand of the diverse location material being carried out the microwave Fast Heating.In open microwave heating system, adopt microwave nonstorage calorifier with super clever structure, also can reduce microwave leakage, reduce the pressure of microwave protection.
Need to prove:
1. the thickness h of sheet metal is greater than the microwave skin depth of the used metal material of sheet metal.In order to save cost, wish that the thickness h of unit metal sheet is the smaller the better, but at least should greater than or preferably be not less than ten times of microwave skin depth of the used metal material of unit metal sheet.
2. super clever structural material can will super clever metallic pattern be made in dielectric material surface or the embedding medium material by methods such as stickup, silk screen printing, evaporation coating or sputter coatings to be realized.
3. the real part of the complex dielectric permittivity of the dielectric layer material in the super clever structural material is less than 10, and imaginary part is less than 0.5, and microwave can low-lossly see through super clever structural material like this, and the microwave that does not influence load substantially uses and absorbs.
4. the microwave energy that produces from magnetron sees through microwave output windows such as waveguide or horn antenna, and microwave energy is earlier through super clever structural material, again to material radiation to be heated.
5. the structural parameters of super clever structural material comprise the size and the shape of sheet metal, periodic arrangement, rotation symmetric arrays, and individual layer, bilayer or multilayer, and sheet thicknesses etc., all adjustable within the specific limits.For the microwave source of same frequency, change parameter and can obtain different effective dielectric constants, thereby change the penetration depth of microwave, realize that microwave energy assembles and to the rapid microwave heating of material at diverse location.
6. because super clever structural material has near the effect of its microwave wavelength of compression, it is very near from microwave output window distance that the utility model is particularly useful for heating location, less than the material of one or several microwave source wavelength.
7. introduce several microwave emission wavelet sources because super clever structural material is equivalent to, can effectively improve the uniformity of microwave heating.With respect to the critical piece of huge microwave heating equipment, super clever structural material weight is lighter, it is slowly rotated with the stirring microwave field, thereby realize better microwave heating uniformity.
8. in open microwave heating system, adopt the microwave heating equipment of super clever structural material, can also effectively reduce microwave leakage, reduce the pressure of microwave protection.
In sum, the microwave heating equipment that the utility model provides can focus on ad-hoc location with microwave energy, improves the microwave heating efficient of material, can also effectively improve the uniformity that microwave energy distributes, and reaches the purpose of rapid and uniform heating material.
Description of drawings
Fig. 1 is the structural representation of the microwave heating equipment with super clever structural material that provides of the utility model.Wherein, the 1st, magnetron, the 2nd, waveguide or horn antenna, the 3rd, super clever structural material, the 4th, the support of fixing super clever structural material, the 5th, material to be heated.
Fig. 2 is the cross section structure schematic diagram of super clever structural material.Wherein, the 7th, metal pattern layer, the 8th, dielectric layer.
Fig. 3 is a kind of planar structure schematic diagram of the super clever structural material with 90 ° of rotational symmetry structures of bilayer.Wherein (a) is layer of metal graph layer structure; (b) be another layer metal pattern layer structure; Bilevel pair of metal sheet, its angle are 40 °.
Fig. 4 is the Electromagnetic Simulation test curve of the microwave penetrating rate of super clever structural material shown in Figure 3.
Fig. 5 is the Electromagnetic Simulation test curve of the equivalent complex dielectric permittivity real part of super clever structural material shown in Figure 3.
Fig. 6 has the structural representation of the microwave heating equipment of three groups of magnetrons and horn antenna.
Fig. 7 adopts one group of magnetron and horn antenna,, directly heats and is placed under the super clever structural material and heat the correlation curve of water temperature rise time Δ t 1500ml water heating 300s with the 1kW microwave.
Embodiment
Microwave heating equipment with super clever structural material, the step below adopting when design and making:
Step 1:
Electromagnetic Simulation is determined physical dimension, cycle size, symmetry or the rotational symmetry structure of the metal unit of metal pattern layer in the super clever structural material.Need consider metal material and dielectric material material behaviors such as loss during Electromagnetic Simulation to microwave.According to the effective dielectric constant of position calculation needs to be heated, the super clever structural material parameter of selection and location matches to be heated.Adjust parameter, make microwave energy low-loss, obtain more uniform microwave energy on material to be heated surface and distribute through super clever structural material.
Step 2:
According to the Electromagnetic Simulation result of step 1, adopt the structural parameters of optimizing to make super clever structural material.Can adopt methods such as bonding, silk screen printing, evaporation coating or sputter coating to make.
Step 3:
It is preceding that the super clever structural material that makes is placed on microwave energy output window (waveguide or horn antenna), between microwave output window and material to be heated; Requirement propagates into the microwave output window from the microwave energy that magnetron sends, and earlier through super clever structural material, is radiated the material position of stand-by microwave heating again.
Step 4:
Carry out the microwave heating experiment.Research has the efficient of the microwave heating equipment heating diverse location material of super clever structural material.The Temperature Distribution on material surface when obtaining microwave heating with thermal infrared imager, thus the distribution situation of microwave energy obtained on the material surface.Analyze the distribution situation of penetration depth, microwave heating efficient and the microwave energy of microwave according to the microwave heating result of experiment, prove this microwave nonstorage calorifier with super clever structure, really have the microwave energy of making and concentrate on ad-hoc location, improve the microwave heating efficient of material, and improve the inhomogeneity effect of microwave heating.
Repeating step 1,2,3 and 4 repeatedly, optimize the structural parameters of super clever structure, make penetration depth, efficiency of microwave heating and the microwave heating uniformity of microwave obtain unified preferably.
Applicating example
Designed and produced a kind of 2.45GHz microwave heating equipment with super clever structural material.
1. Electromagnetic Simulation is determined structural parameters
The result determines structural parameters according to Electromagnetic Simulation.Fig. 3 has shown the super clever structure of metal a kind of bilayer, that have rotational symmetry structure.In the transmittance curve of Electromagnetic Simulation, for the 2.45GHz microwave, the penetrance of microwave is about-1.2dB in Fig. 4.Microwave energy is through behind the super clever structural material, and most of microwave energy is to material radiation to be heated, rather than reflects back.
2. calculating effective dielectric constant
Calculate the effective dielectric constant of the dielectric-slab of super clever structural material.In the curve of the effective dielectric constant real part of Fig. 5, for the 2.45GHz microwave, the effective dielectric constant of this super clever structural material is about 5.7, much larger than airborne effective dielectric constant 1.The 2.45GHz microwave field that Electromagnetic Simulation obtains distributes and microwave energy distributes, demonstrate the 2.45GHz microwave through behind the super clever structural material, near the dielectric-slab microwave wavelength is less than the propagation wavelength of microwave in the air, and microwave energy accumulates near the super clever structural material.
3. make microwave heating equipment with super clever structural material
According to the structure of Fig. 3,, on microcrystal glass plate, prepared double-deck aluminium flake array with 4 rotational symmetry structures with bonding method.This super clever structural material is fixed between the horn antenna mouth and material to be heated of Fig. 6 with support.The 2.45GHz microwave energy that magnetron sends through this super clever structural material, is radiated on the material to be heated earlier via horn antenna again.
4. microwave heating experiment
Adopt one group of magnetron and horn antenna in the microwave heating equipment shown in Figure 6,12.0 ℃ of room temperatures, humidity 48% adopts microwave power 1kW, to 1500ml water heating 300s.The water temperature that shown Fig. 7 rise and super clever structural material to the relation of the distance of the water surface.Among Fig. 7, along with super clever structural material apart from the reducing of water surface distance H, the rising Δ t of water temperature presents index decreased.Super clever structural material is removed, obtained directly heating accordingly the water temperature that obtains behind the 1500ml water and risen and the relation that heats variable in distance, the rising Δ t of water temperature presents linear change.Among Fig. 7, during H＞25mm, the efficient that directly adds hot water is higher than the efficient that adds the heating of excess of imports grain husk structural material, when H＜25mm, adds the efficient that excess of imports grain husk structural material adds hot water and is higher than direct-fired efficient.This result shows, in microwave heating equipment, add excess of imports grain husk structural material after, microwave energy mainly concentrates on the super clever structural material 25mm of distance with interior zone, can realize for specific range (＜25mm) locate the microwave Fast Heating of material; And for similar open microwave heating system, apart from the zone beyond the dielectric-slab 25mm, microwave energy leaks the direct-fired situation that also is far smaller than.The conclusion that the microwave field of Electromagnetic Simulation distributes among this result and Fig. 6 is consistent.
Adopt three groups of magnetrons and horn antenna among Fig. 6, total microwave power reaches 3kW, to a plank heating 60s.The Temperature Distribution on the plank surface that the employing infrared thermography obtains.The thermal infrared imager imaging results shows directly heating, and temperature distributing disproportionation is even; And in microwave heating equipment, having added the result that super clever structural material heats, the Temperature Distribution in most of zone is more even.If slowly rotate or move super clever structural material, change the position that microwave is concentrated heating, can further improve the uniformity of microwave heating.Adopt this method, can exempt and move heavy magnetron and aerial array obtaining the even heating of microwave, more pratical and feasible and effect is remarkable.
Above-mentioned Electromagnetic Simulation and experimental result prove that this microwave heating equipment with super clever structural material can be realized the rapid and uniform heating of material at ad-hoc location.
Claims (8)
1. the microwave heating equipment that has super clever structural material comprises microwave generation device and microwave output device; Also comprise super clever structural material (3), be placed on the microwave output window of microwave heating equipment by support (4) before; Described super clever structural material is composited by metal pattern layer (7) and dielectric layer (8); Described metal pattern layer (7) is the single or multiple lift structure and is arranged in dielectric layer (8) surface or is embedded into dielectric layer, and is made of equally distributed metallic pattern unit; Each metallic pattern unit constitutes rotational symmetry structure by one or more shapes with the identical sheet metal of size.
2. the microwave heating equipment with super clever structural material according to claim 1 is characterized in that, described microwave generation device is magnetron (1).
3. the microwave heating equipment with super clever structural material according to claim 1 is characterized in that, described microwave output device is waveguide or horn antenna (2).
4. the microwave heating equipment with super clever structural material according to claim 1, it is characterized in that, in the super clever structural material (3), the shape of described sheet metal is rectangle, circle, Fang Huan, annulus, " ten " font, " Swastika " font, or the rectangle that splits, circle, side's ring or annulus.
5. the microwave heating equipment with super clever structural material according to claim 1 is characterized in that, in the super clever structural material (3), the thickness h of sheet metal is greater than the microwave skin depth of the used metal material of sheet metal.
6. the microwave heating equipment with super clever structural material according to claim 1 is characterized in that, in the super clever structural material (3), the real part of the complex dielectric permittivity of described dielectric layer (8) material is less than 10, and imaginary part is less than 0.5.
7. the microwave heating equipment with super clever structural material according to claim 6 is characterized in that, described dielectric layer (8) material is to satisfy devitrified glass, tellite or the pottery that complex dielectric permittivity requires.
8. the microwave heating equipment with super clever structural material according to claim 1 is characterized in that, the thickness of described super clever structural material (3) is no more than 1/2nd wavelength of work microwave.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201091240U CN201742593U (en) | 2010-02-03 | 2010-02-03 | Microwave heating device with structural metamaterial |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010201091240U CN201742593U (en) | 2010-02-03 | 2010-02-03 | Microwave heating device with structural metamaterial |
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| CN201742593U true CN201742593U (en) | 2011-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480004A (en) * | 2011-03-29 | 2012-05-30 | 深圳光启高等理工研究院 | Metamaterial with spatial clearance and preparation method of metamaterial |
-
2010
- 2010-02-03 CN CN2010201091240U patent/CN201742593U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102480004A (en) * | 2011-03-29 | 2012-05-30 | 深圳光启高等理工研究院 | Metamaterial with spatial clearance and preparation method of metamaterial |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110209 Effective date of abandoning: 20111221 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20110209 Effective date of abandoning: 20111221 |