CN116193659B - Microwave condition heating effect evaluation method - Google Patents
Microwave condition heating effect evaluation method Download PDFInfo
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- CN116193659B CN116193659B CN202310448303.9A CN202310448303A CN116193659B CN 116193659 B CN116193659 B CN 116193659B CN 202310448303 A CN202310448303 A CN 202310448303A CN 116193659 B CN116193659 B CN 116193659B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6432—Aspects relating to testing or detecting leakage in a microwave heating apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/04—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant in circuits having distributed constants, e.g. having very long conductors or involving high frequencies
- G01R27/06—Measuring reflection coefficients; Measuring standing-wave ratio
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
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Abstract
The invention discloses a method for evaluating microwave condition heating effect, belonging to the technical field of microwave heating, firstly, a standing wave type microwave resonant cavity model is constructed, the microwave resonant cavity model comprises a microwave resonant cavity, a waveguide and an object to be heated, the object to be heated is placed in the microwave resonant cavity, and the waveguide is arranged on the side wall of the microwave resonant cavity in a staggered manner; then, standing-wave ratio of a physical field in the microwave resonant cavity is calculated, and the microwave heating effect of the microwave resonant cavity can be obtained through the standing-wave ratio. According to the invention, parameters in the microwave radio frequency field are introduced, the propagation loss condition of microwaves in the microwave resonant cavity is intuitively reflected by adopting the radio frequency parameter voltage standing wave ratio, and the heating effect condition of the microwaves on materials under different processes or operation conditions is rapidly compared and evaluated by the loss condition of the microwaves in the transmission process, so that a great amount of evaluation and analysis time is saved, and the expenditure of various detection methods is saved.
Description
Technical Field
The invention belongs to the technical field of microwave heating, and particularly relates to a microwave condition heating effect evaluation method.
Background
In recent years, the microwave heating technology is gradually developed from the food heating of a household microwave oven to the industrial microwave heating field, for example, in the aspects of microwave drying, microwave material sintering, microwave soil remediation and the like.
The adaptation of the microwave device describes the propagation loss condition of microwaves among all groups of devices, namely whether the characteristics of the microwave generating unit, the transmission unit and the interior of the microwave resonant cavity are suitable for matching, if the matching effect is better, the loss of the microwaves among the three is less, and the energy utilization rate of the microwaves is higher. The preferred procedure for microwave devices is therefore to reduce the losses of microwaves during transmission. The transmission loss can be reflected by partial parameters in the microwave radio frequency field, and in the microwave heating field, the microwave condition heating effect can be judged only according to the temperature change, temperature uniformity or microwave electromagnetic field intensity distribution result of the material obtained after the heating is finished, and the judging mode greatly increases the time and energy cost, is complicated in the data screening treatment process, is easy to generate errors, and influences the evaluation result of the microwave condition heating effect. In the experimental heating process of an actual microwave device, when the heating effect of microwaves on materials under different processes and operation conditions is evaluated, how the heating effect is not accurately detected at any time is considered, and after heating, data screening statistics is still needed on all results, and then the comparison analysis is carried out, so that the process is complex and complicated, and the optimal condition of the heating effect of the microwave device cannot be obtained through rapid comparison.
Disclosure of Invention
The invention aims to provide a microwave condition heating effect evaluation method, which aims to solve the technical problems of long time consumption, complex process and easy error in the prior art that the heating effect of the microwave condition is judged by the temperature or electromagnetic field of a material after heating.
In order to solve the technical problems, the invention adopts the following technical scheme:
a microwave condition heating effect evaluation method comprises the following steps:
s100: constructing a standing wave type microwave resonant cavity model: the microwave resonant cavity model comprises a microwave resonant cavity, a waveguide and an object to be heated, wherein the object to be heated is placed in the microwave resonant cavity, and the waveguide is installed on the side wall of the microwave resonant cavity in a staggered manner;
s200: calculating standing wave ratio of a physical field in the microwave resonant cavity, and obtaining microwave heating effect of the microwave resonant cavity through the standing wave ratio.
Preferably, in step S200, the derivation of the relationship among the voltage standing wave ratio, the return loss and the reflection coefficient in the microwave cavity is as follows:
wherein VSWR is the voltage standing wave ratio; RL (dB) is return loss; w (W) Hair brush And W is equal to Returning to The power of the emitted microwaves is the power of the incident microwaves and the power of the reflected microwaves reflected back through the inner wall of the resonant cavity and the waveguide respectively; u (U) Hair brush And U Returning to The microwave voltage is respectively the emitted microwave voltage of the incident microwave and the reflected microwave voltage reflected back through the resonant cavity and the inner wall of the waveguide;
is the reflection coefficient;
the available microwave energy in the microwave resonant cavity is expressed by voltage:
U can be used =U Hair brush -U Returning to （6）
The relation between standing-wave ratio and available microwave energy in the microwave resonant cavity is obtained by the formula (5) and the formula (6) as follows:
substituting equation (9) into equation (8)
Wherein E is Can be used The unit is V/m for the available electric field intensity in the microwave resonant cavity; d is the height of the microwave resonant cavity, and is a fixed value, and the unit is m;
the electric field intensity and U in the microwave resonant cavity are obtained according to the formula Can be used Is positively correlated with standing wave ratio and E Can be used And the two are in negative correlation.
Preferably, the absorption power relation of the material of the object to be heated to microwaves is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
the dielectric constant in vacuum is expressed as F/m; />
The relative dielectric constant of the material is F/m; f is the frequency of the microwave in working, and the unit is GHz; e is the effective value of the electric field intensity of the position where the material is located, and the unit is V/m; tan delta is the loss tangent of a material and can reflect the degree to which the material absorbs microwave energy;
and obtaining the conclusion that the absorption power of the material to be heated in the microwave resonant cavity to microwaves is inversely related to the standing-wave ratio.
Preferably, the object to be heated is a SiC round bar, and the SiC round bar is disposed on a base at the bottom of the microwave resonant cavity.
Preferably, the waveguide is connected with a solid-state microwave source, and the solid-state microwave source is adopted in an actual microwave device to conveniently detect the VSWR value.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: compared with the prior art, the method has the advantages that the propagation loss condition of microwaves in the microwave resonant cavity is intuitively reflected by introducing parameters in the microwave radio frequency field and adopting the radio frequency parameter Voltage Standing Wave Ratio (VSWR), and the heating effect condition of the microwaves on the material is rapidly evaluated by the loss condition of the microwaves in the transmission process. The overall heating effect of the microwave on the material can be directly judged and evaluated through the detection of the radio frequency parameters, compared with the traditional method which needs multiple methods and can evaluate the effect of microwave heating the material through repeated detection in a data processing analysis method, a great amount of evaluation and analysis time is saved, and the expenditure of multiple detection methods is also saved. The invention provides a method for rapidly comparing and evaluating microwave heating effects, which can rapidly obtain the condition heating effects of a microwave device by detecting the magnitude of a VSWR value when a plurality of groups of materials are applied to the microwave device for heating or are subjected to microwave heating under various microwave heating processes and operating conditions.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of a microwave cavity model in an embodiment of the invention;
FIG. 2 is a specific evaluation step of one embodiment of the present invention;
FIG. 3 is a graph showing the relationship between standing wave ratio obtained by post-processing the model calculation result and heating effect under the microwave frequency adjustment condition;
FIG. 4 is a graph showing the relationship between standing wave ratio obtained by post-processing the model calculation result and microwave heating effect under the condition of adjusting the thickness of the SiC round bar;
in the figure: 1-microwave resonant cavity, 2-waveguide, 3-object to be heated and 4-base.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The method for evaluating the heating effect of the microwave condition provided by the embodiment of the invention comprises the following steps:
s100: constructing a standing wave type microwave resonant cavity model: as shown in fig. 1, the microwave resonant cavity model comprises a microwave resonant cavity 1, a waveguide 2 and an object to be heated 3, wherein the object to be heated 3 is placed in the microwave resonant cavity 1, and the waveguide 2 is installed on the side wall of the microwave resonant cavity 1 in a staggered manner. In an actual microwave device, a waveguide 2 is connected with a solid-state microwave source, and the solid-state microwave source can detect a VSWR value in real time by detecting the degree of reflected waves; the object to be heated 3 is a SiC round bar which is arranged on a base 4 at the bottom of the microwave resonant cavity 1.
By means of a computer theory simulation technology, a standing wave type microwave resonant cavity multi-physical field theory model is constructed on a computer platform to serve as a basis for applying a calculation example, a complete theory calculation model is constructed by adjusting in theory such as an electromagnetic wave Maxwell equation set, a heat transfer equation and the like, iterative operation is carried out on the theory model, standing wave ratio (VSWR) is used as an adaptive optimal condition for a microwave heating material, and a theory result is obtained and used for guiding pushing practical implementation of a practical device.
S200: calculating standing wave ratio of a physical field in the microwave resonant cavity, and obtaining microwave heating effect of the microwave resonant cavity through the standing wave ratio.
The deduction process of the relation among the voltage standing wave ratio, the return loss and the reflection coefficient in the microwave resonant cavity is as follows:
wherein RL (dB) is return loss; w (W) Hair brush And W is equal to Returning to The microwave power emitted by the incident microwave and the reflected microwave power reflected back through the inner wall of the waveguide are respectively; u (U) Hair brush And U Returning to The microwave voltage is respectively the emitted microwave voltage of the incident microwave and the reflected microwave voltage reflected back through the inner wall of the microwave resonant cavity waveguide;
is the reflection coefficient; and obtaining the relation between the reflection coefficient and the VSWR through substitution of the return loss and the reflection coefficient equation.
From the above formula, VSWR and U Returning to And U Hair brush The relation between the microwave energy and the microwave energy in the microwave resonant cavity is expressed as voltage:
U can be used =U Hair brush -U Returning to （6）
The relation between standing-wave ratio and available microwave energy in the microwave resonant cavity is obtained by the formula (5) and the formula (6) as follows:
and also (b)
（9）
From this, it can be seen that the electric field intensity in the microwave resonant cavity and U Can be used The two are positively correlated.
Substituting equation (9) into equation (8)
Wherein E is Can be used The unit is V/m for the available electric field intensity in the microwave resonant cavity; d is the height of the microwave resonant cavity, and is a fixed value, and the unit is m. Thus, it can be known that standing wave ratio and E Can be used And the two are in negative correlation.
The relation of the absorption power of the material of the object to be heated to microwaves is as follows:
wherein, the liquid crystal display device comprises a liquid crystal display device,
the dielectric constant in vacuum is expressed as F/m; />
The unit of the relative dielectric constant of the material is F/m, and the unit is generally the real part of the complex dielectric constant of the material; reflecting the ability of the object to absorb microwaves to a certain extent; f is the frequency of the microwave in working, and the unit is GHz; e is the effective value of the electric field intensity of the position where the material is located, and the unit is V/m; tan delta is a materialThe loss tangent of (2) can reflect the degree to which the material absorbs microwave energy.
Obtained according to formula (11): and a conclusion that the absorption power of the material to be heated in the microwave resonant cavity to microwaves is inversely related to the VSWR is made. Therefore, when the VSWR value is lower, the better heating effect can be obtained for the object to be heated in the microwave resonant cavity.
In the specific implementation, a theoretical calculation model is built on a computer platform, a transmission unit, namely a waveguide end and an incidence port, of the theoretical model are detected in the model in a specific probe detection mode in the calculation process, a resonant cavity unit, namely the resonant cavity size and a resonant cavity internal device, and a joint part of a resonant cavity wall and a feed-in port in the theoretical model are detected, a microwave heating material unit, namely a heating material configuration and a tray configuration part are detected, and a VSWR result is obtained. In the microwave radio frequency module, the lower the VSWR is, the better the suitability of the microwave device is, the better the microwave transmission effect is, the lower the loss is, the better the heating material absorbs the microwave energy, the VSWR obtained from theoretical calculation not only can measure the propagation benefit and loss condition of the microwave, evaluate the incidence effect of the microwave and other conditions, but also can directly evaluate the heating uniformity condition of the microwave on the heating material.
In a specific embodiment provided by the invention, a microwave heating SiC model is constructed through a computer simulation platform for resolving, wherein the microwave heating SiC model comprises a square microwave resonant cavity, two rectangular waveguide ports and a SiC round bar, wherein the two rectangular waveguide ports are asymmetrically arranged on two different sides, and the SiC round bar is arranged in the center of the model. Fig. 3 and fig. 4 show the heating effect after the microwave frequency condition and the microwave heating effect after the SiC thickness condition are adjusted, respectively, and the trough value of the VSWR is exactly the position with the best heating effect under the microwave condition, and the crest value of the VSWR is exactly the position with the worst heating under the microwave condition, corresponding to the deduction of the previous equation.
The invention provides a method for evaluating the heating effect of an integral microwave heating device by taking a Voltage Standing Wave Ratio (VSWR) of a microwave radio frequency propagation parameter as a method for evaluating the heating effect of the integral microwave heating device. Microwaves excited by the microwave excitation source propagate into the resonant cavity through the waveguide transmission line, and the waveguide and the inner wall of the resonant cavity are lowA metal material having dielectric characteristics, an incident microwave is reflected on the inner wall, the reflected wave and the incident wave are brought into contact with each other (superimposed or cut) in the waveguide transmission line and the resonant cavity, and as a result, a plurality of antinodes and valleys are formed in the waveguide and the resonant cavity, and an antinode voltage (U max ) Voltage at the trough (U) min ) The ratio of (2) is VSWR.
If the resonant cavity load is completely matched with the waveguide transmission line, the reflection coefficient is 0, the voltage standing wave ratio is 1, but the realization is practically impossible, the microwave cannot be lost in the transmission process, so that the propagation loss can be reduced as much as possible only by optimizing the matching condition between microwave devices, the VSWR value is the influence degree of the reflected wave of the microwave on the incident wave, the lower the degree is, the better the incident effect is, the lower the loss of the microwave in the transmission process is, the better the incident condition of the microwave is, and the better the heating effect of the material in the microwave resonant cavity is.
In summary, the beneficial effects of the invention are as follows:
A. the method for evaluating the heating effect of the microwave condition provided by the invention extends from the microwave radio frequency field, and can directly judge and evaluate the overall heating effect of the microwave on the material only by detecting the radio frequency parameter, wherein the heating effect comprises a temperature result, a uniformity result, a heating rate and other results, and the effect of the microwave heating material can be evaluated by repeatedly detecting and analyzing by a plurality of methods in the prior art.
B. The method for evaluating the heating effect of the microwave condition mainly provides a method for rapidly judging the heating effect of the microwave device under various processes and operation conditions, and when a plurality of groups of materials are applied to the heating of the microwave device or the microwave heating is performed under various microwave heating processes and operation conditions, the heating effect of the microwave device can be rapidly compared and obtained through the magnitude of the VSWR value.
C. The method for evaluating the microwave condition heating effect provides convenience for a microwave heating device which takes the solid-state microwave source as a microwave excitation source, and the solid-state microwave source can calculate the reflected microwave quantity in real time in the working process and detect the real-time VSWR value at the same time, so that the condition heating effect can be directly evaluated according to the VSWR value calculated by the solid-state microwave source when the solid-state microwave source is taken as the excitation source.
In the foregoing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed above.
Claims (6)
1. The microwave condition heating effect evaluation method is characterized by comprising the following steps of:
s100: constructing a standing wave type microwave resonant cavity model: the microwave resonant cavity model comprises a microwave resonant cavity, a waveguide and an object to be heated, wherein the object to be heated is placed in the microwave resonant cavity, and the waveguide is installed on the side wall of the microwave resonant cavity in a staggered manner;
s200: calculating the standing-wave ratio of a physical field in the microwave resonant cavity, and obtaining the microwave heating effect of the microwave resonant cavity through the standing-wave ratio, wherein the lower the VSWR value is, the better the heating effect of the object to be heated in the microwave resonant cavity can be obtained.
2. The method for evaluating a heating effect under microwave conditions according to claim 1, wherein: in step S200, the voltage standing wave ratio in the microwave cavity is obtained by the following formula:
wherein VSWR is the voltage standing wave ratio; w (W) Hair brush And W is equal to Returning to The power of the emitted microwaves is the power of the incident microwaves and the power of the reflected microwaves reflected back through the inner wall of the resonant cavity and the waveguide respectively; u (U) Hair brush And U Returning to Microwave voltage and microwave voltage emitted via resonant cavity and waveguideThe reflected microwave voltage reflected back by the wall.
3. The method for evaluating a heating effect under microwave conditions according to claim 2, wherein:
the available microwave energy in the microwave resonant cavity is as follows: u (U) Can be used =U Hair brush -U Returning to
The relation between standing wave ratio and available microwave energy in the microwave resonant cavity is as follows:
the electric field intensity and U in the microwave resonant cavity are obtained according to the formula Can be used Is positively correlated with standing wave ratio and E Can be used And the two are in negative correlation.
4. A microwave conditional heating effect evaluation method according to claim 3, characterized in that:
the relation of the absorption power of the material of the object to be heated to microwaves is as follows:
wherein (1)>
The dielectric constant in vacuum is expressed as F/m; />
The relative dielectric constant of the material is F/m; f is the frequency of the microwave in working, and the unit is GHz; e is the effective value of the electric field intensity of the position where the material is located, and the unit is V/m; tan delta is the loss tangent of a material and can reflect the degree to which the material absorbs microwave energy;
and obtaining the conclusion that the absorption power of the material to be heated in the microwave resonant cavity to microwaves is inversely related to the standing-wave ratio.
5. The method for evaluating a heating effect under microwave conditions according to claim 1, wherein: the object to be heated is a SiC round rod which is arranged on a base at the bottom of the microwave resonant cavity.
6. The method for evaluating a heating effect under microwave conditions according to claim 1, wherein: the waveguide is connected to a solid state microwave source.
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| RU2329618C1 (en) * | 2007-01-09 | 2008-07-20 | Государственное образовательное учреждение высшего профессионального образования Саратовский государственный технический университет (СГТУ) | Laboratory chamber of microwave heating |
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