阅读说明：本技术 一种微波加热结构、方法及系统 (Microwave heating structure, method and system ) 是由 张益� 黄卡玛 陈星� 王策 陈倩 于 2021-09-22 设计创作，主要内容包括：本申请实施例涉及微波加热领域,具体而言,涉及一种微波加热结构、方法及系统,旨在解决现有的加热系统对工件加热时适用性较低的问题,微波加热结构包括：矩形基底,矩形基底由上至下包括第一金属层、介质基板和第二金属层,在矩形基底至少两条的邻边上,沿边缘的长度方向均匀间隔设置有多个金属化过孔,多个金属化过孔用于连接第一金属层和第二金属层；激发部,激发部与矩形基底连接；容置腔,容置腔贯穿第一金属层、介质基板和第二金属层,用于容纳被加热物体,在相同功率下微波能在矩形基底内产生更高场强,使被加热物体快速升温,实现了相同功率下加热速度较快,相同加热速度下所需功率更低的效果,有效提高了整个系统的适用性。(The embodiment of the application relates to the field of microwave heating, in particular to a microwave heating structure, a method and a system, which aim to solve the problem that the existing heating system is low in applicability when heating a workpiece, and the microwave heating structure comprises: the rectangular substrate comprises a first metal layer, a dielectric substrate and a second metal layer from top to bottom, wherein a plurality of metalized through holes are uniformly arranged on at least two adjacent edges of the rectangular substrate at intervals along the length direction of the edge and are used for connecting the first metal layer and the second metal layer; the excitation part is connected with the rectangular substrate; the containing cavity penetrates through the first metal layer, the medium substrate and the second metal layer and is used for containing the heated object, the microwave energy generates higher field intensity in the rectangular substrate under the same power, the heated object is heated rapidly, the effects that the heating speed is higher under the same power and the required power is lower under the same heating speed are achieved, and the applicability of the whole system is effectively improved.)

1. A microwave heating structure, characterized in that it comprises:

the rectangular substrate (1) comprises a first metal layer (3), a dielectric substrate (2) and a second metal layer (4) from top to bottom, a plurality of metalized through holes (5) are uniformly arranged on at least two adjacent edges of the rectangular substrate (1) at intervals along the length direction of the edge, and the metalized through holes (5) are used for connecting the first metal layer (3) and the second metal layer (4);

the excitation part (6) is connected with the rectangular substrate (1) and is used for inputting external microwaves into the rectangular substrate (1), wherein the input microwaves are blocked in an area enclosed by the metalized through holes (5);

an accommodation chamber (7), the accommodation chamber (7) penetrating through the first metal layer (3), the dielectric substrate (2), and the second metal layer (4), for accommodating an object to be heated.

2. Microwave heating structure according to claim 1, characterized in that the excitation section (6) comprises:

a coaxial connector (61) for inputting external microwaves into the rectangular substrate (1), an outer conductor (612) of the coaxial connector (61) being connected to the first metal layer (3), and an inner conductor (611) of the coaxial connector (61) being connected to the second metal layer (4).

3. Microwave heating structure according to claim 2, characterized in that the coaxial connector (61) is arranged on a diagonal of the rectangular substrate (1), and the impedance of the microwave heating structure of the coaxial connector (61) and the rectangular substrate (1) is a preset impedance.

4. The microwave heating structure according to claim 1, wherein the first metal layer (3) and the second metal layer (4) are located at the opening of the accommodating cavity (7), and microwave cut-off structures (71) respectively connected to the first metal layer (3) and the second metal layer (4) are provided for reducing the microwaves leaking from the opening of the accommodating cavity (7).

5. The microwave heating structure according to claim 1, wherein the accommodating cavity (7) is formed along a direction perpendicular to the plate surface of the rectangular substrate (1), the section of the accommodating cavity (7) is rectangular or circular, and the accommodating cavity (7) is located at the center of the plate surface of the rectangular substrate (1) or at a position close to one side edge.

6. A microwave heating structure according to claim 1, characterized in that the rectangular substrate (1) is provided with a plurality of metallized through holes (5) at regular intervals along the length direction of the edges on two adjacent edges or three edges of the plate surface;

the excitation section (6) comprises a coaxial connector (61) and a microwave input line (62), the inner conductor (611) of the coaxial connector (61) being connected to the first metal layer (3) via the microwave input line (62), the outer conductor (612) of the coaxial connector (61) being connected to the second metal layer (4).

7. Microwave heating structure according to claim 6, characterized in that the connection point of the microwave input line (62) to the first metal layer (3) is located on the edge of the first metal layer (3) where the metallized via (5) is not located, and the impedance of the excitation section (6) consisting of the coaxial connector (61) and the microwave input line (62) is a predetermined impedance.

8. A microwave heating method, based on the microwave heating structure, the microwave heating method comprising:

acquiring the current resonant frequency of the microwave heating structure in real time;

adjusting an input frequency of microwaves input into the microwave heating structure based on the current resonant frequency;

inputting microwaves into the microwave heating structure according to the input frequency so as to heat the heated object;

repeating the above steps until the heated object is heated to a target temperature.

9. The heating system of claim 8, wherein the microwave heating method further comprises:

acquiring the current temperature of the heated object according to a preset time interval;

determining microwave heating power according to the current temperature and the target temperature;

and inputting microwaves into the microwave heating structure according to the microwave heating power.

10. A microwave heating system comprising said microwave heating structure, the microwave input means comprising:

the detection module is used for acquiring the current resonant frequency in the microwave heating structure in real time;

the first adjusting module is used for adjusting the input frequency of the microwaves input into the microwave heating structure so as to enable the input frequency to be consistent with the current resonant frequency;

and the output device is used for inputting microwaves into the microwave heating structure according to the input frequency so as to heat the heated object until the heated object is heated to a target temperature.

Technical Field

The embodiment of the application relates to the field of microwave heating, in particular to a microwave heating structure, method and system.

Background

Microwave has been widely used and developed as an information carrier, but after the thermal effect of microwave was discovered by p.spencer until the 40 th century, microwave energy was widely used in the fields of material processing, food, chemical industry, etc. as a clean and efficient energy source.

Compared with the traditional heating technology, the microwave has the advantages of body heating, high speed and efficiency, selective heating and the like. However, most of the existing microwave heating technologies adopt multiple mold cavities for heating, which has the problems of large volume, complex system and the like, and the heating uniformity and consistency are also affected. More importantly, in many applications such as material synthesis or sensing, a sample or a device needs to be heated to a higher temperature in a short time, but the conventional heating system has a slow heating speed, and when the heating speed is increased, a large power is needed, so that the applicability is low.

Content of the specification

The embodiment of the application aims to provide a microwave heating structure, a microwave heating method and a microwave heating system, and aims to solve the problem that the existing heating system is low in applicability when heating a workpiece.

A first aspect of an embodiment of the present application provides a microwave heating structure, including: the rectangular substrate comprises a first metal layer, a dielectric substrate and a second metal layer from top to bottom, wherein a plurality of metalized through holes are uniformly arranged on at least two adjacent edges of the rectangular substrate at intervals along the length direction of the edge, and the metalized through holes are used for connecting the first metal layer and the second metal layer;

the excitation part is connected with the rectangular substrate and is used for inputting external microwaves into the rectangular substrate, wherein the input microwaves are blocked in an area enclosed by the plurality of metalized through holes;

and the accommodating cavity penetrates through the first metal layer, the medium substrate and the second metal layer and is used for accommodating a heated object.

Optionally, the excitation portion comprises:

and the coaxial connector is used for inputting external microwaves into the rectangular substrate, an outer conductor of the coaxial connector is connected with the first metal layer, and an inner conductor of the coaxial connector is connected with the second metal layer.

Optionally, the coaxial connector is disposed on a diagonal of the rectangular substrate, and an impedance of the microwave heating structure formed by the coaxial connector and the rectangular substrate is a preset impedance.

Optionally, the first metal layer and the second metal layer are located at the opening of the accommodating cavity, and a microwave cut-off structure connected to the first metal layer and the second metal layer is provided to reduce the microwave leaked from the opening of the accommodating cavity.

Optionally, the accommodating cavity is formed in a direction perpendicular to the rectangular substrate surface, the cross section of the accommodating cavity is rectangular or circular, and the accommodating cavity is located at the center of the rectangular substrate surface or at a position close to one side edge.

Optionally, a plurality of metalized through holes are uniformly arranged on two adjacent edges or three adjacent edges of the rectangular substrate along the length direction of the edges at intervals;

the excitation portion includes a coaxial connector and a microwave input line, an inner conductor of the coaxial connector is connected with the first metal layer through the microwave input line, and an outer conductor of the coaxial connector is connected with the second metal layer.

Optionally, a connection point of the microwave input line and the first metal layer is located on an edge of the first metal layer where the metalized via is not located, and an impedance of an excitation portion formed by the coaxial connector and the microwave input line is a preset impedance.

A second aspect of the embodiments of the present application provides a microwave heating method, based on the microwave heating structure, the heating method includes:

acquiring the current resonant frequency of the microwave heating structure in real time;

adjusting an input frequency of microwaves into the microwave heating structure based on the current resonant frequency;

inputting microwaves into the microwave heating structure at the input frequency to heat the object to be heated;

repeating the above steps until the heated object is heated to a target temperature.

Optionally, the heating method further comprises:

acquiring the current temperature of the heated object according to a preset time interval;

determining microwave heating power according to the current temperature and the target temperature;

and inputting microwaves into the microwave heating structure according to the microwave heating power.

A second aspect of the embodiments of the present application provides a microwave heating system, including the microwave heating structure, the microwave input device includes:

the detection module is used for acquiring the current resonant frequency in the microwave heating structure in real time;

the first adjusting module is used for adjusting the input frequency of the microwaves input into the microwave heating structure so as to enable the input frequency to be consistent with the current resonant frequency;

and the output device is used for inputting microwaves into the microwave heating structure according to the input frequency so as to heat the heated object until the heated object is heated to a target temperature.

Has the advantages that:

the present application provides a microwave heating structure, method and system, when microwave is inputted into a rectangular substrate, the microwave is limited in the area enclosed by the metallized through hole, when the heated object enters the accommodating cavity, due to the characteristic of the microwave, the microwave energy generates higher field intensity in the rectangular substrate under the same power, so that the heated object is rapidly heated, thereby realizing the effect of quickly heating the heated object, and by adopting the structure of the application, the energy of the microwave is enclosed in one area by the metal via hole, the microwave hardly leaks, and is directly absorbed by the heated object, the loss of the whole heating process is less, the utilization rate of energy is effectively improved, therefore, the required power is less under the condition of the same heating speed, therefore, the effects of higher heating speed under the same power and lower required power under the same heating speed are realized, and the applicability of the whole system is effectively improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a microwave heating structure according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a coaxial connector connection according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a microwave cut-off mechanism according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an accommodating chamber according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of another accommodating chamber according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a via opening method for metallization according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of another via opening method for metallization according to an embodiment of the present application;

fig. 8 is a schematic flow chart of a microwave heating method according to an embodiment of the present application.

Description of reference numerals: 1. a rectangular base; 2. a dielectric substrate; 3. a first metal layer; 4. a second metal layer; 5. metallizing the via hole; 6. an excitation section; 61. a coaxial connector; 611. an inner conductor; 612. an outer conductor; 62. a microwave input line; 7. an accommodating cavity; 71. and a microwave cut-off structure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the related art, when a workpiece or an object is heated, heating equipment is often required to be used for heating in order to heat the workpiece or the object to a preset temperature, however, in the prior art, because the heating equipment is low in heating speed, the heating speed of the heating equipment is increased, the heating equipment is often realized by increasing the power of the heating equipment, so that the power is high, even the power of the heating equipment cannot meet the requirement, and the applicability is low.

In view of this, the present application provides a microwave heating structure, which includes:

the rectangular substrate 1 comprises a first metal layer 3, a dielectric substrate 2 and a second metal layer 4 from top to bottom, a plurality of metalized through holes 5 are uniformly arranged on at least two adjacent edges of the rectangular substrate 1 at intervals along the length direction of the edge, and the metalized through holes 5 are used for connecting the first metal layer 3 and the second metal layer 4; the excitation part 6 is connected with the rectangular substrate 1 and is used for inputting external microwaves into the rectangular substrate 1, wherein the input microwaves are blocked in an area enclosed by the plurality of metallized through holes 5; and the accommodating cavity 7 penetrates through the first metal layer 3, the medium substrate 2 and the second metal layer 4, and is used for accommodating the heated object.

Referring to fig. 1, in the present embodiment, a rectangular substrate 1 includes a square dielectric substrate 2, a first metal layer 3, and a second metal layer 4, the areas of the dielectric substrate 2, the first metal layer 3, and the second metal layer 4 are the same, and the first metal layer 3 and the second metal layer 4 are respectively fixed on two sides of the dielectric substrate 2.

The dielectric substrate 2 is a wave-transparent material, and in some embodiments, the dielectric substrate 2 may be a microwave substrate material, a teflon material, or the like, so as to reduce the loss of the microwave in the dielectric substrate 2. The material of the first metal layer 3 and the second metal layer 4 may be copper, and specifically, the first metal layer 3 and the second metal layer 4 may be copper foil with a thickness of 16 μm, or gold or silver is plated on the surface of the copper foil.

The rectangular substrate 1 is provided with a plurality of metalized through holes 5 at even intervals along the edges of four sides of the rectangular substrate 1, and the metalized through holes are connected with a first metal layer 3 and a second metal layer 4, wherein the first interval between every two adjacent metalized through holes 5 is s, the diameter of each metalized through hole 5 is d, and the ratio of the first interval to the diameter, namely s/d, is less than 2; the second spacing between the vias of two opposite edges is w, and the ratio between the diameter and the second spacing, i.e. d/w, is < 0.1.

When a plurality of heated objects need to be heated simultaneously, the rectangular substrates can be spliced, two sides with equal length can be spliced, and two adjacent sides can share the same row of metallized through holes, so that the effect of heating the heated objects simultaneously is realized, and the whole splicing structure is easier to process.

The excitation portion 6 is disposed on the plate surface of the first metal layer 3, and is used for connecting with an external microwave input device so as to input microwaves into the rectangular substrate 1, and due to the metalized via hole 5 and the first and second metal layers 3 and 4, the microwaves are confined in the area surrounded by the metalized via hole 5.

In some embodiments, the excitation part 6 is connected to a microwave isolation field device, so as to select electric field heating or magnetic field heating according to the material of the heated object, for example, when the microwave isolation field device is applied to organic chemical synthesis, biomass cracking and the like, the excitation part 6 is connected to a microwave electric field device, so as to perform treatment by a microwave electric field; when the device is applied to powder synthesis of special alloys, connection of different metal materials, sintering of ferrite and the like, the device is connected with a microwave magnetic field device through the excitation part 6, so that the treatment is carried out through the microwave magnetic field, and the applicability of the whole device is effectively improved.

The accommodating cavity 7 is arranged in the area surrounded by the metallized through holes 5, and when the microwave oven works, the heated object is conveyed to the position between the first metal plate and the second metal plate in the accommodating cavity 7, and then the microwave is input, so that the heated object is heated through the microwave in the rectangular substrate 1.

When microwaves are input into the rectangular substrate 1, the microwaves are limited in the area enclosed by the metallized through holes 5, when the heated object enters the accommodating cavity 7, due to the characteristics of the microwaves, the microwave energy generates higher field intensity in the rectangular substrate 1 under the same power, so that the heated object is rapidly heated, the effect of rapidly heating the heated object is realized, the energy of the microwaves is directly absorbed by the heated object, the loss in the whole heating process is less, the utilization rate of the energy is effectively improved, the required power is less under the condition of the same heating speed, the effects of higher heating speed under the same power and lower required power under the same heating speed are realized, and the applicability of the whole system is effectively improved.

In some embodiments, referring to fig. 2, the excitation portion 6 includes: the coaxial connector 61 is used for inputting external microwaves into the rectangular substrate 1, the outer conductor 612 of the coaxial connector 61 is connected to the first metal layer 3, and the inner conductor 611 of the coaxial connector 61 is connected to the second metal layer 4.

The coaxial connector 61 includes an outer conductor 612 and an inner conductor 611, a wave-transparent material is filled between the outer conductor 612 and the inner conductor 611, a connection hole is formed in the first metal layer 3, the diameter of the connection hole is equal to the diameter of the outer conductor 612 of the coaxial connector 61, the outer conductor 612 is connected with the first metal layer 3, and the first metal layer 3 does not exist between the inside of the outer conductor 612 of the coaxial connector 61 and the dielectric substrate 2. An inner connection hole penetrating through the dielectric substrate 2 is formed in the region of the connection hole, and the inner conductor 611 of the coaxial connector 61 penetrates through the inner connection hole and then is connected to the second metal layer 4. When an input device for external microwaves is connected through the coaxial connector 61, microwaves are smoothly introduced through the coaxial connector 61.

In some embodiments, the coaxial connector 61 is disposed on a diagonal line of the rectangular substrate 1, and the impedance of the microwave heating structure formed by the coaxial connector 61 and the substrate is a predetermined impedance.

During microwave transmission, when impedance between the two parts is not matched, reflected waves and the like are generated to influence microwave transmission, so that the impedance of the whole microwave transmission path during microwave transmission has requirements, only when the impedance of the whole microwave input path and the impedance of two sides of the port connection part of the microwave heating structure are the same preset impedance, reflection and loss of microwave signals transmitted in the microwave input path are minimum, transmission efficiency is highest, and the impedance can be set to different values according to different microwave transmission materials, for example, when the dielectric substrate 2 is made of polytetrafluoroethylene, the impedance can be 50 Ω. The coaxial connector 61 is arranged on the diagonal line of the rectangular substrate 1, and the impedance of the whole microwave transmission line is adjusted to be preset impedance by adjusting the position and the like, so that the microwave transmission efficiency of the whole structure is effectively improved.

The preset impedance can be adjusted according to the type of the microwave input device or the coaxial connector 61 and the material of the dielectric substrate 2, so as to achieve the best microwave transmission effect.

In some embodiments, referring to fig. 3, the first metal layer 3 and the second metal layer 4 are disposed at the opening of the accommodating cavity 7, and a microwave blocking structure 71 connected to the first metal layer 3 and the second metal layer 4 is disposed on the first metal layer 3 and the second metal layer 4, respectively, for reducing the microwave leaking from the opening of the accommodating cavity 7.

Wherein, microwave cuts off structure 71 and can be the pipe that cuts off of metal material, when being heated the object and placing in holding chamber 7 by the heating, because holding chamber 7 both ends opening, lead to partial microwave to reveal from both sides opening easily, can the experimenter influence to external environment, can lead to microwave heating efficiency to reduce simultaneously, consequently, at the both sides opening part of heating chamber, the fixed microwave that sets up microwave and cut off structure 71 and reveal cuts off the reflection, wherein, microwave cuts off structure 71's cross sectional shape and opening shape looks adaptation, or slightly less than holding chamber 7, microwave cuts off structure 71's length and cross sectional area directly proportional.

In some embodiments, referring to fig. 1, 4 and 5, the accommodating cavity 7 is opened along a direction perpendicular to the plate surface of the rectangular substrate 1, the section of the accommodating cavity 7 is rectangular or circular, and the accommodating cavity 7 is located at the center of the plate surface of the rectangular substrate 1 or near one side edge.

Wherein, the opening direction of the containing cavity 7 is parallel to the thickness direction of the rectangular substrate 1, so as to improve the microwave heating efficiency and facilitate the transmission of the heated object. According to the shape of the heated object, the shape of the accommodating cavity 7 can be preset to different shapes, for example, when the rectangular substrate 1 is used for heating a plate, the cross section of the accommodating cavity 7 can be set to be rectangular, wherein the length direction of the accommodating cavity 7 is parallel to the edge of any rectangular substrate 1 and is set at one side close to the edge of any rectangular substrate 1, or is set at the middle position of the rectangular substrate 1, so that the plate-shaped/layered material is processed, and the device is further applied to the aspects of novel high-performance microwave welding, microwave preparation of composite materials, connection and repair of high polymer materials and the like, and the applicability of the device is effectively improved.

When the heated object is a strip or tube object, the cross section of the accommodating cavity 7 can be formed in a circular shape, wherein the length direction of the accommodating cavity 7 is parallel to the edge of any rectangular substrate 1 and is formed in the middle of the rectangular substrate 1 or close to any edge of the rectangular substrate 1.

In some embodiments, referring to fig. 6 and 7, a plurality of metalized vias 5 are uniformly arranged on two adjacent edges or three adjacent edges of the rectangular substrate 1 along the length direction of the edges; the excitation section 6 includes a coaxial connector 61 and a microwave input line 62, the inner conductor 611 of the coaxial connector 61 is connected to the first metal layer 3 through the microwave input line 62, and the outer conductor 612 of the coaxial connector 61 is connected to the second metal layer 4.

For example, when the metalized via 5 is formed on three edges of the rectangular substrate 1, due to the symmetric characteristic of the microwave, the electromagnetic line on one side edge of the rectangular substrate 1, which is not formed with the metalized via 5 when the microwave is transmitted, is an ideal magnetic wall, so that the microwave field mode is not changed, and the amount of the metalized via and the volume of the rectangular substrate 1 are reduced. The area of the first metal layer 3 can be changed according to the opening condition of the metalized via hole 5, and the area of the second metal layer 4 is moderate and is the same as that of the dielectric substrate 2.

In some embodiments, the connection point of the microwave input line 62 and the first metal layer 3 is located on the edge of the first metal layer 3 where the metalized via 5 is not located, and the impedance of the excitation portion 6 formed by the coaxial connector 61 and the microwave input line 62 is a predetermined impedance.

When the metallized via 5 is opened as in the above case, that is, when the rectangular substrate 1 has an edge where the metallized via 5 is not opened, the coaxial connector 61 may be disposed on the sidewall of the rectangular substrate 1, and by connecting the outer conductor 612 with the second metal layer 4, the inner conductor 611 is connected with the edge of the first metal layer 3 where the metallized via 5 is not opened through the microwave input line 62, so that external microwaves are input into the rectangular substrate 1.

Impedance matching of the entire structure is achieved by adjusting the impedance of the excitation section 6 composed of the coaxial connector 61 and the microwave input line 62, for example, by adjusting the width of the microwave transmission line, the impedance may be set to different values according to the microwave transmission material, for example, when the dielectric substrate 2 is made of teflon, the impedance may be 50 Ω. The predetermined impedance may be adjusted according to the material of the dielectric substrate 2, the type of the microwave input device or coaxial connector 61, and the type of the microwave input line 62, so as to achieve the best microwave transmission effect.

In some embodiments, when a plurality of the above structures are used simultaneously, one side edge of two rectangular substrates 1 with metallized via holes 5 can be spliced, and the same column of metallized via holes 5 is used for adjacent edges, and the same coaxial connector 61 is used to connect different rectangular substrates 1 through different microwave input lines 62, so as to achieve the effect of heating a plurality of heated objects simultaneously, and make the whole assembly structure easier to process.

The embodiment of the present application further provides a microwave heating method, based on the microwave heating structure, with reference to fig. 8, the heating method includes:

s1, acquiring the current resonant frequency of the microwave heating structure in real time;

in some embodiments, by connecting the double-coupling detection structure at the excitation portion, part of the microwaves on the microwave transmission path are transmitted into the double-coupling detection structure, so as to detect the input state, the output state and the reflection state of the whole heating structure, thereby acquiring the current resonant frequency of the microwave heating structure in real time.

The probe can be inserted into the accommodating cavity or inserted from other positions of the microwave heating structure, a small-sized loop antenna is adopted to couple a microwave field in a position close to the edge in an area surrounded by the metallized through hole 5, and the effect of acquiring the current resonant frequency of the microwave heating structure in real time is realized by connecting a diode detection circuit.

S2, adjusting an input frequency of the microwave to be inputted into the microwave heating structure based on the current resonance frequency.

In the heating process, the dielectric constant of the heated object changes along with the rise of temperature, and the resonant frequency of the microwave heating structure changes along with the heating process generally along with phase change, chemical reaction and the like in the heating process.

Therefore, when the heated object is heated, the current resonant frequency of the microwave heating structure is acquired in real time, and then the input frequency of the input microwave is enabled to be the same as the resonant frequency by adjusting the input frequency of the input microwave into the microwave heating structure, so that the heating efficiency of the whole structure is always in a higher state, and the heating effect on the heated object is effectively improved.

Meanwhile, the resonant frequency of the microwave heating structure is judged within a millisecond time period through a frequency tracking algorithm with quick response, and the input frequency of the microwave is adjusted according to the resonant frequency, so that the input frequency is quickly adjusted, the response speed in the heating process is improved, and the heating effect on the heated object is further improved.

S3, microwave is input into the microwave heating structure according to the input frequency, thereby heating the object to be heated until the object to be heated is heated to the target temperature.

S4, repeating the above steps until the heated object is heated to the target temperature.

The input frequency of the input microwave is adjusted to be the same as the resonance frequency, so that the heating efficiency of the whole structure is always in a higher state, the heating rate of the heated object is effectively improved, the utilization rate of energy is improved, the material is heated to the required temperature by using power far lower than that of the traditional mode and is kept at the temperature, and the effect of effectively improving the heating speed under the same power is realized;

the microwave can reduce the activation energy of partial chemical reaction, and the microwave electric field and the magnetic field have different reduction effects, so that when the microwave heating structure is used for microwave heating, the energy required for heating the reactant is further reduced by the 'activation energy for reducing the chemical reaction', and the effects of reducing the energy consumption of the microwave and saving energy and reducing emission are realized.

In other embodiments, microwave-separated electric field heating or microwave-separated magnetic field heating may be selected according to the actual situation of the heated object, for example, when applied to organic chemical synthesis, biomass pyrolysis, etc., the microwave electric field device is connected to the excitation part to perform treatment by the microwave electric field; when the device is applied to powder synthesis of special alloys, connection of different metal materials, sintering of ferrite and the like, the device is connected with a microwave magnetic field device through an excitation part, so that the treatment is carried out through a microwave magnetic field, and the applicability of the whole device is effectively improved.

In some embodiments, the heating method further comprises:

s101, acquiring the current temperature of a heated object according to a preset time interval;

the temperature of the heated object is detected once per a preset heating time interval by a temperature detecting means such as a temperature sensor or the like, thereby obtaining the current temperature of the heated object in time.

Wherein the preset time interval can be determined according to the characteristics of the heated object, such as dielectric constant, etc., so that the heated object can be accurately heated to the target temperature.

S102, determining microwave heating power according to the current temperature and the target temperature;

according to the current temperature of the heated object, the heating speed of the heated object is adjusted in real time, the phenomenon that the temperature of the heated object is overhigh or cannot reach the target temperature in time is avoided, and the applicability of the whole method is improved.

And S103, inputting microwaves into the microwave heating structure according to the microwave heating power.

The heated object is heated by the microwave heating power determined according to the current temperature and the target temperature, so that the effect of accurately controlling the heating temperature is realized, and meanwhile, the utilization rate of energy is improved.

In a specific embodiment, when an object to be heated is heated by a microwave heating structure, the added object is conveyed into an accommodating cavity, the resonant frequency of the microwave heating structure is firstly measured, the input microwave frequency is set according to the resonant frequency, the input microwave frequency is enabled to be consistent with the resonant frequency, the current temperature of the heated object is detected, the heating power of the microwave is determined according to the preset heating target temperature and the current temperature, and then the microwave is input according to the determined microwave frequency and the heating power to start heating; after heating to a preset time interval, detecting whether the current temperature of the heated object reaches a target temperature, if not, acquiring the resonant frequency of the microwave heating structure again, enabling the input microwave frequency to be consistent with the resonant frequency, then re-determining the heating power of the microwave according to the newly acquired current temperature and the target temperature, continuing heating according to the new microwave frequency and the heating power, repeating the operation until the heated object is heated to the target temperature, and enabling the input frequency of the input microwave to be the same as the resonant frequency by adjusting the input frequency of the input microwave, so that the heating efficiency of the whole structure is always in a higher state, the heating rate of the heated object is effectively improved, the utilization rate of energy is improved, and the effect of effectively improving the heating speed under the same power is realized.

The embodiment of this application still provides a microwave heating system, including the microwave heating structure, microwave input device includes:

the detection module is used for acquiring the current resonant frequency of the microwave heating structure in real time;

in some embodiments, the detection module includes a double-coupling detection structure, and the double-coupling detection structure is connected to the excitation portion to transmit part of the microwaves on the microwave transmission path into the double-coupling detection structure, so as to detect the input state, the output state and the reflection state of the whole heating structure, and thus obtain the current resonant frequency of the microwave heating structure.

The detection module can also comprise a probe, the probe penetrates into the accommodating cavity, a small-sized loop antenna is adopted to couple a microwave field in the accommodating cavity, and the effect of detecting the current resonant frequency of the microwave heating structure in real time is realized by connecting a diode detection circuit.

The first adjusting module is used for adjusting the input frequency of the microwaves input into the microwave heating structure so as to enable the input frequency to be consistent with the current resonant frequency.

And the output device is used for inputting microwaves into the microwave heating structure according to the input frequency so as to heat the heated object until the heated object is heated to the target temperature.

In some embodiments, the microwave heating system further comprises:

and a temperature acquisition module. The temperature control device is used for acquiring the current temperature of a heated object according to a preset time interval;

a second adjustment module; determining microwave heating power according to the current temperature and the target temperature;

the output device is also used for inputting microwaves into the microwave heating structure according to the microwave heating power.

In some embodiments, the microwave heating system further comprises:

the conveying module can be a conveyor belt, the conveyor belt penetrates through the accommodating cavity, the material of the part of the conveying device, which penetrates through the heated object, is determined according to the heated object, for example, the conveying device can be a wave-transmitting material, so that the microwave is completely absorbed by the heated object, and can also be a wave-absorbing material, and the heated object which cannot absorb the electromagnetic wave on the conveying device can be heated by absorbing the electromagnetic wave.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the system or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application. Moreover, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or should not be construed as indicating or implying relative importance. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or terminal equipment comprising the element.

The technical solutions provided by the present application are described in detail above, and the principles and embodiments of the present application are described herein by using specific examples, which are only used to help understanding the present application, and the content of the present description should not be construed as limiting the present application. While various modifications of the illustrative embodiments and applications will be apparent to those skilled in the art based upon this disclosure, it is not necessary or necessary to exhaustively enumerate all embodiments, and all obvious variations and modifications can be resorted to, falling within the scope of the disclosure.