CN110708778B - Intelligent microwave heating method and device - Google Patents
Intelligent microwave heating method and device Download PDFInfo
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- CN110708778B CN110708778B CN201911031246.4A CN201911031246A CN110708778B CN 110708778 B CN110708778 B CN 110708778B CN 201911031246 A CN201911031246 A CN 201911031246A CN 110708778 B CN110708778 B CN 110708778B
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- 229910000831 Steel Inorganic materials 0.000 claims description 3
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- 238000009826 distribution Methods 0.000 description 5
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- 241000084490 Esenbeckia delta Species 0.000 description 2
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- 235000008429 bread Nutrition 0.000 description 2
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- 235000012015 potatoes Nutrition 0.000 description 2
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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
- H05B6/02—Induction heating
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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
- H05B6/02—Induction heating
- H05B6/06—Control, e.g. of temperature, of power
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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
- H05B6/6447—Method of operation or details of the microwave heating apparatus related to the use of detectors or sensors
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Abstract
The invention discloses an intelligent microwave heating method and device, wherein the heating method comprises the following steps: step S1: acquiring a geometric model and attributes of a heated object; step S2: calculating the heating frequency and heating time of the heated object according to the geometric model and type of the heated object; step S3: heating the heated object according to the heating frequency and the heating time. The intelligent microwave heating method provided by the invention automatically obtains the geometric modeling of the heated object and judges the attribute of the heated object, so as to calculate the heating frequency and the heating time, fully considers the dynamic change characteristic of the heated object along with the time, improves the accuracy of frequency selection, realizes the intelligent heating process, and reduces the degree of dependence of the heating process on people.
Description
Technical Field
The invention relates to the field of microwave heating, in particular to an intelligent microwave heating method and device.
Background
With the rapid development of modern science and technology, microwave energy is widely applied to various fields such as industrial production, daily life and the like as a novel high-efficiency clean energy.
The prior microwave oven has the problem of poor heating uniformity of the heated object. In order to solve the technical problem, in the application of the prior art, the heating uniformity is improved by heating the heated object by the variable frequency microwaves (such as a variable frequency microwave oven), but the frequency conversion is often realized by simply sweeping the frequency in one frequency band, and the problem of low microwave absorption rate of the heated object, namely low heating efficiency still exists. Recently disclosed as a microwave frequency-selective heating device and a method thereof, the microwave adjusting device is arranged to select the heating frequency, so that the heating uniformity of the heated object is improved, and the microwave absorption efficiency is improved. The method mainly comprises the steps of obtaining an electric field, a magnetic field, dissipation power and temperature of a heated object in a certain frequency range by means of multi-physical-field calculation after geometrically modeling the heated object and inputting a dielectric constant, and storing the results into a memory. Then, the microprocessor selects the frequency corresponding to S11 < -3dB, and starts the frequency adjusting device to adjust the microwave heating frequency.
The prior art mainly has the following defects: firstly, the geometric modeling process of the heated object needs to be manually completed, the specific size setting needs to be carried out, and the process is relatively complicated; secondly, the dielectric properties of the heated object need to be manually input, and the dielectric properties of the substance can be dynamically changed in the heating process, so that the degree of matching between the calculation result and the actual result is poor to a certain extent while the degree of intellectualization is poor. That is, it is possible that the heating frequency selected is not necessarily the optimum microwave frequency. Third, the adjustment of the frequency lacks real-time performance. Because the prior method obtains the preferred frequency through pre-calculation, and along with the time lapse of heating, when the deviation between the pre-selected frequency and the actually required preferred frequency occurs, the output frequency can not be adjusted in time, thereby further improving the heating uniformity and efficiency.
Therefore, how to effectively improve the microwave heating efficiency is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an intelligent microwave heating method and device, which are used for improving the microwave heating efficiency and improving the heating uniformity.
In order to achieve the purpose, the invention provides the following technical scheme:
an intelligent microwave heating method comprises the following steps:
step S1: acquiring a geometric model and attributes of a heated object;
step S2: calculating the heating frequency and heating time of the heated object according to the geometric model and type of the heated object;
step S3: heating the heated object according to the heating frequency and the heating time.
Preferably, in step S2, there are a plurality of heating frequencies;
the step S2 further includes: according to the pre-stored information, several heating frequencies of the heated object are calculated, and the sequence of the heating frequencies is obtained.
Preferably, after step S3, the method further includes:
acquiring a real-time reflection coefficient of the heated object;
and comparing the target reflection coefficient and the real-time reflection coefficient at each time point, and adjusting the heating frequency in real time according to the difference value of the target reflection coefficient and the real-time reflection coefficient.
Preferably, in step S2, the method for calculating the heating frequency includes:
according to the preset frequency step length, calculating and obtaining parameters of an electric field, a magnetic field, dissipation power, temperature and a reflection coefficient S11 of the heated object in a preset frequency range;
the coefficient of variation Cov which can be used to measure the heating uniformity is calculated according to equation (1):
wherein: t isiThe temperature of the sample is an arbitrary point temperature,
is the average temperature of the molten steel, and is,
(i.e. Delta T in the Table) is the average temperature rise
On the basis, all heating frequencies corresponding to S11 < -3dB are selected through comparison, and the sequence of the selected heating frequencies is determined according to the magnitude of S11.
Preferably, the step S2 further includes:
calculating microwave energy absorbed by the object according to the sequence of the heating frequencies and S11 parameters corresponding to the frequency points of the heating frequencies;
and calculating the heating time when the heated object reaches a preset average temperature by combining the geometric parameters, the density and the specific heat capacity parameters of the object.
An intelligent microwave heating device comprises a microwave oven main body, wherein a microwave oven inner cavity is arranged in the microwave oven main body, the intelligent microwave heating device further comprises a camera assembly and a controller, the camera assembly is used for acquiring a geometric model and attributes of a heated object, the controller is used for obtaining heating frequency and heating time of the heated object according to information acquired by the camera assembly, and the camera assembly is arranged in the microwave oven inner cavity.
Preferably, the camera assembly comprises a processor, a camera and a guide rail for moving the camera, and the controller is further configured to control the camera to move or rotate according to a preset path and angle.
Preferably, the camera assembly further comprises a camera memory, a power supply, a communication interface and a trolley carrier for mounting the camera, and the trolley carrier can move along the guide rail.
Preferably, the heating device further comprises an information memory for storing appearance characteristics, a dielectric constant table, density and specific heat capacity parameter information of common substances, and the controller is used for obtaining the heating frequency and the heating time of the heated object for the information stored inside the information memory according to the geometric model and the attribute of the heated object.
Preferably, the heating device further comprises a sensor for acquiring the real-time reflection coefficient of the heated object by a user, and the controller is further used for adjusting the heating frequency in real time according to the temperature information acquired by the sensor.
The intelligent microwave heating method provided by the invention comprises the following steps: step S1: acquiring a geometric model and attributes of a heated object; step S2: calculating the heating frequency and heating time of the heated object according to the geometric model and type of the heated object; step S3: heating the heated object according to the heating frequency and the heating time. The intelligent microwave heating method provided by the invention automatically obtains the geometric modeling of the heated object and judges the attribute of the heated object, so as to calculate the heating frequency and the heating time, fully considers the dynamic change characteristic of the heated object along with the time, improves the accuracy of frequency selection, realizes the intelligent heating process and reduces the interference of human factors.
The intelligent microwave heating device provided by the invention comprises a microwave oven main body, wherein a microwave oven inner cavity is arranged in the microwave oven main body, the intelligent microwave heating device also comprises a camera assembly for acquiring a geometric model and attributes of a heated object and a controller for acquiring the heating frequency and the heating time of the heated object according to the acquired information of the camera assembly, and the camera assembly is arranged in the microwave oven inner cavity. According to the intelligent microwave heating device provided by the invention, the geometric modeling of the heated object is realized through the camera assembly, the operation is convenient and quick, the optimized heating frequency and heating time of the heated object are automatically obtained through the controller, the intelligent operation is realized, the manual input is not needed, and the selection of the heating frequency is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of an intelligent microwave heating method provided by the present invention;
FIG. 2 is a schematic structural diagram of an embodiment of an intelligent microwave heating apparatus according to the present invention;
FIG. 3-A is a schematic diagram of the temperature distribution of the upper surface of a potato chip by the intelligent microwave heating device provided by the present invention;
FIG. 3-B is a schematic diagram of a temperature distribution of an upper surface of a potato chip by an intelligent microwave heating device provided in the prior art;
fig. 4 is a schematic structural diagram of a connection relationship block diagram of components in the intelligent microwave heating apparatus provided by the present invention;
wherein: 1. a camera; 2. a guide rail; 3. a display screen; 4. a sensor; 5. a controller; 6. a frequency modulation knob; 7. a keyboard; 8. a start button; 9. an inner cavity of the microwave oven; 10. a handle; 11. a door of the microwave oven; 12. a microwave source.
Detailed Description
The core of the invention is to provide an intelligent microwave heating method and device, which can improve the uniformity and efficiency of microwave heating.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 4, fig. 1 is a flowchart illustrating an intelligent microwave heating method according to the present invention; FIG. 2 is a schematic structural diagram of an embodiment of an intelligent microwave heating apparatus according to the present invention; FIG. 3-A is a schematic diagram of the temperature distribution of the upper surface of a potato chip by the intelligent microwave heating device provided by the present invention; FIG. 3-B is a schematic diagram of a temperature distribution of an upper surface of a potato chip by an intelligent microwave heating device provided in the prior art; fig. 4 is a schematic structural diagram of a connection relationship block diagram of each component in the intelligent microwave heating apparatus provided by the present invention.
The intelligent microwave heating method comprises the following steps:
step S1: acquiring a geometric model and attributes of a heated object, specifically, shooting the heated object through a plurality of angles to generate the geometric model of the heated object, automatically completing a three-dimensional modeling process, and judging the attributes of the heated object, such as potatoes or bread;
step S2: calculating the heating frequency and heating time of the heated object according to the geometric model and type of the heated object, specifically, directly providing a data table of the dielectric property of the heated object changing along with time after comparing with the existing data in the information memory according to the geometric model and type of the heated object, and calculating the optimal heating frequency and heating time according to the data table;
step S3: the heated object is heated according to the heating frequency and the heating time, and the automatic selection and heating process is realized.
Further, after step S3, the method further includes:
step S4: and stopping heating after the heating time is reached.
The intelligent microwave heating device provided by the invention realizes geometric modeling of the heated object through the camera assembly, is convenient and quick, automatically obtains the optimized heating frequency and heating time of the heated object through the controller 5, realizes intelligent operation, does not need manual input, and has more accurate selection of the heating frequency.
Preferably, in step S2, there are a plurality of heating frequencies, that is, the object to be heated can be heated by a plurality of different heating frequencies;
in addition, step S2 further includes: a plurality of heating frequencies of the object to be heated are calculated based on the information stored in advance, and the order of the heating frequencies is obtained.
In the steps, the problems of low efficiency and poor heating effect caused by heating only at the same frequency in the prior art can be solved by selecting a plurality of heating frequencies;
meanwhile, each heating frequency preferably corresponds to one heating time, and the heating times corresponding to the heating frequencies may be the same time or may be proportionally distributed according to the magnitude of the reflection coefficient S11 corresponding to the heating frequencies.
Specifically, the method for calculating the heating frequency includes:
according to the preset frequency step length, calculating and obtaining parameters of an electric field, a magnetic field, dissipation power, temperature and reflection coefficient S11 of the heated object in the preset frequency range through multiple physical fields; specifically, the preset frequency range is preferably 10GHz to 300 MHz;
the Coefficient of Variation Cov, i.e., Coefficient of Variation, which can be used to measure the uniformity of heating, is calculated according to equation 1:
wherein: t isiThe temperature of the sample is an arbitrary point temperature,
is the average temperature of the molten steel, and is,
(i.e. Delta T in the Table) is the average temperature rise
On the basis, all heating frequencies corresponding to S11 < -3dB are selected through comparison, and the sequence of the selected heating frequencies is determined according to the magnitude of S11.
More specifically, the heating frequencies may be sorted according to the magnitude of the reflection coefficient S11, with the heating frequency corresponding to the reflection coefficient S11 having a smaller value being sorted in the front, and the heating frequency corresponding to the reflection coefficient S11 having a larger value being sorted in the rear.
It should be noted that, when selecting the heating frequency, the frequency is selected according to the average value or average temperature rise of the electric field, for example, the microwave frequency with the average value or average temperature rise of the electric field higher than a preset value is selected.
In addition to the above embodiments, step S2 further includes:
calculating the microwave energy absorbed by the object according to the sequence of the heating frequencies and the S11 parameters corresponding to the frequency points of the heating frequencies;
the heating time when the heated object reaches a predetermined average temperature is calculated by combining the geometric parameters, density and specific heat capacity parameters of the object.
The above steps are used for calculating the total heating time, which can be displayed on the display screen 3, and are convenient for the user to take the heated object.
In addition to the above embodiments, the method further includes, after step S3:
acquiring a real-time reflection coefficient of a heated object;
and comparing the target reflection coefficient and the real-time reflection coefficient at each time point, and adjusting the heating frequency in real time according to the difference value of the target reflection coefficient and the real-time reflection coefficient.
In the above steps, the heating precision and efficiency are further improved through real-time feedback, and after the sequence of the preferred heating frequency is obtained through calculation, the preferred frequency is timely adjusted on the basis, so that the heating efficiency can be further improved; by intelligently controlling the heating time, the heating is automatically stopped after the target temperature is reached.
In addition to the above embodiments, step S1 further includes: acquiring the initial temperature of a heated object; step S2 further includes: heating time corresponding to each heating frequency is determined according to the initial temperature of the heated object. For example, the heating time may be increased accordingly for articles taken out of the refrigerator, and the heating time may be decreased appropriately for articles at normal temperature. Of course, it is also possible to determine whether or not the object is frozen when acquiring the geometric model and the attributes of the object to be heated, and to adjust the heating time corresponding to each heating frequency accordingly.
Besides the intelligent microwave heating method, the invention also provides an intelligent microwave heating device.
The intelligent microwave heating device comprises a microwave oven main body, a microwave oven inner cavity 9 is arranged in the microwave oven main body, and the intelligent microwave heating device further comprises a camera shooting assembly and a controller 5.
The camera shooting assembly is used for obtaining a geometric model and attributes of the heated object, the controller 5 is used for obtaining the heating frequency and the heating time of the heated object according to the obtained information of the camera shooting assembly, the camera shooting assembly is arranged in the inner cavity 9 of the microwave oven, and the controller 5 can be arranged on the microwave oven body or outside the microwave oven body.
The intelligent microwave heating device provided by the invention realizes geometric modeling of the heated object through the camera assembly, is convenient and quick, automatically obtains the optimized heating frequency and heating time of the heated object through the controller 5, realizes intelligent operation, does not need manual input, and has more accurate selection of the heating frequency.
In addition to the above embodiments, the heating apparatus further includes an information memory for storing information on appearance characteristics, a dielectric constant table, density, and specific heat capacity parameters of a common substance, and the controller 5 is configured to obtain a heating frequency and a heating time of the object to be heated with respect to the information stored inside the information memory based on the geometric model and the attributes of the object to be heated.
In addition to the above embodiments, the heating apparatus further includes a sensor 4 for acquiring a real-time reflection coefficient of the object to be heated by a user, and the controller 5 is further configured to adjust the heating frequency in real time based on the temperature information acquired by the sensor 4.
On the basis of the above embodiments, the camera assembly includes a processor, a camera 1 and a guide rail 2 for moving the camera 1, and the controller 5 is further configured to control the camera 1 to move or rotate according to a preset path and angle, and specifically, the guide rail 2 is preferably installed on the top of the cavity 9 of the microwave oven.
On the basis of the above embodiments, the camera module further includes a camera memory, a power supply, a communication interface, and a carriage carrier for mounting the camera 1, and the carriage carrier can move along the guide rail 2. Specifically, the communication interface may be a USB interface or a 1394 interface.
Further, the processor is connected with the camera assembly through a serial port device and used for controlling the camera assembly to acquire images of the heated object and realize a three-dimensional modeling function.
On the basis of the above embodiments, the microwave oven body is also provided with a frequency modulation knob 6, which can manually adjust the microwave frequency; and, there is an input keyboard 7, which can be used for entering the dielectric properties, density, specific heat capacity parameters of the substance or for manually setting the heating time.
Preferably, a display screen 3 for displaying the heating time and/or the heating frequency is further arranged on the microwave oven main body, so that the microwave oven is convenient to observe.
Furthermore, the microwave oven main body is also provided with a starting button 8 and a microwave oven door 11, and the microwave oven door 11 is provided with a handle 10, so that the microwave oven is convenient to use.
On the basis of each embodiment, the device can also comprise a WIFI component, and the input of a remote control microwave heating device or parameters is realized.
In a specific embodiment, the specific operation process of the device and the method is as follows:
putting an object into a furnace box, pressing a start button 8, controlling a camera assembly by a processor to take a picture of the heated object every 13-17 degrees, preferably 15 degrees, generating a three-dimensional model of the heated object by the processor according to the taken picture after the camera 1 moves for a circle, completing geometric modeling, and storing a modeling result into a storage unit, such as a camera memory, in the processor; meanwhile, the attributes of the heated object are judged, such as whether the heated object belongs to potatoes, bread or other types, and after the comparison is carried out through a storage unit, such as the existing result of an information memory, the object type judgment is carried out, and a dielectric property table, and the density and specific heat capacity parameter values corresponding to the object type judgment are called out from the information memory;
substituting the obtained geometric modeling result into a multi-physical-field calculation program by combining with a dielectric property table, carrying out frequency selection between 10GHz and 300MHz to obtain a microwave frequency sequence capable of efficiently heating, and simultaneously estimating the total heating time;
heating is carried out, the controller 5 sequentially outputs according to the optimized heating frequency, the action time of each frequency is controlled by a built-in clock unit, and the microwave heating frequency is timely adjusted under the control of the processor according to the reflected power detected by the sensor 4;
when the estimated heating time is reached, the controller 5 controls the microwave source 12 to stop heating.
Examples are: as shown in fig. 3-a and 3-B, by comparing the temperature distribution on the upper surface of the rectangular potato chip, after heating for 30 seconds, the heating method provided by the present embodiment is adopted to perform the optimization of the microwave heating frequency, and the heating effect is significantly better.
The intelligent microwave heating method and device provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (9)
1. An intelligent microwave heating method is characterized by comprising the following steps:
step S1: acquiring a geometric model and attributes of a heated object;
step S2: calculating the heating frequency and heating time of the heated object according to the geometric model and type of the heated object;
step S3: heating the heated object according to the heating frequency and the heating time;
in step S2, the method for calculating the heating frequency includes:
according to the preset frequency step length, calculating and obtaining parameters of an electric field, a magnetic field, dissipation power, temperature and a reflection coefficient S11 of the heated object in a preset frequency range;
calculating a coefficient of variation Cov for measuring heating uniformity according to formula (1):
wherein:
the temperature of the sample is an arbitrary point temperature,
is the average temperature of the molten steel, and is,
in order to average the temperature rise,
(ii) a On the basis, all heating frequencies corresponding to S11 < -3dB are selected through comparison, and the sequence of the selected heating frequencies is determined according to the magnitude of S11.
2. The intelligent microwave heating method according to claim 1, wherein in the step S2, the heating frequency is plural;
the step S2 further includes: according to the pre-stored information, several heating frequencies of the heated object are calculated, and the sequence of the heating frequencies is obtained.
3. The intelligent microwave heating method according to claim 1, further comprising, after the step S3:
acquiring a real-time reflection coefficient of the heated object;
and comparing the target reflection coefficient and the real-time reflection coefficient at each time point, and adjusting the heating frequency in real time according to the difference value of the target reflection coefficient and the real-time reflection coefficient.
4. The intelligent microwave heating method according to claim 2, wherein the step S2 further includes:
calculating microwave energy absorbed by the object according to the sequence of the heating frequencies and S11 parameters corresponding to the frequency points of the heating frequencies;
and calculating the heating time when the heated object reaches a preset average temperature by combining the geometric parameters, the density and the specific heat capacity parameters of the object.
5. An intelligent microwave heating device, which adopts the intelligent microwave heating method according to any one of claims 1 to 4, and comprises a microwave oven main body, wherein a microwave oven inner cavity (9) is arranged in the microwave oven main body, the intelligent microwave heating device is characterized by further comprising a camera component for acquiring a geometric model and attributes of a heated object and a controller (5) for acquiring the heating frequency and the heating time of the heated object according to the acquired information of the camera component, and the camera component is arranged in the microwave oven inner cavity (9).
6. An intelligent microwave heating device according to claim 5, characterized in that the camera assembly comprises a processor, a camera (1) and a guide rail (2) for the camera (1) to move, and the controller (5) is further configured to control the camera (1) to move or rotate according to a preset path and angle.
7. An intelligent microwave heating device according to claim 6, characterized in that the camera assembly further comprises a camera memory, a power supply, a communication interface and a trolley carrier for mounting the camera (1), the trolley carrier moving along the guide rail (2).
8. The intelligent microwave heating device according to any one of claims 5 to 7, further comprising an information memory for storing parameter information of appearance characteristics, dielectric constant table, density, specific heat capacity of common substances, and the controller (5) is configured to obtain heating frequency and heating time of the heated object with respect to the information stored inside the information memory, based on the geometric model and attributes of the heated object.
9. The intelligent microwave heating device according to any one of claims 5 to 7, further comprising a sensor (4) for acquiring real-time reflection coefficient of the heated object by a user, wherein the controller (5) is further configured to adjust the heating frequency in real time according to the temperature information acquired by the sensor (4).
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