CN114269036A - Power distribution system for microwave heating device - Google Patents
Power distribution system for microwave heating device Download PDFInfo
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- CN114269036A CN114269036A CN202111570439.4A CN202111570439A CN114269036A CN 114269036 A CN114269036 A CN 114269036A CN 202111570439 A CN202111570439 A CN 202111570439A CN 114269036 A CN114269036 A CN 114269036A
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Abstract
The invention provides a power distribution system for a microwave heating device, which comprises a power distribution mechanism and a leaky wave antenna mechanism, wherein the power distribution mechanism comprises a heating cavity, a first second divider, a straight waveguide, a second divider, a first bent waveguide, a triangular metal tuning element and a thin plate metal tuning element. The conveyor belt penetrates through the heating cavity, is positioned in the irradiation areas of the top leaky wave antenna and the bottom leaky wave antenna, penetrates through the microwave suppressor at the end part of the heating cavity to reach the external space, the radiation directions of the four rectangular metal cavities all face the inside of the heating cavity, the length direction of the elongated gap is not parallel to the transmission direction of the leaky wave antenna, microwave energy is radiated to the materials at the same time on the upper surface and the lower surface of the heated materials to heat the materials, the heating uniformity degree of the materials is greatly improved, the space field distribution is not uniform, the materials are heated unevenly, the available bandwidth of equipment is greatly widened, and the sensitivity of the equipment to the material characteristics is reduced.
Description
Technical Field
The invention relates to the technical field of power distribution devices, in particular to a power distribution system for a microwave heating device.
Background
The microwave heating is the result of the interaction between polar molecules in the material and the microwave electromagnetic field, under the action of the external alternating electromagnetic field, the polar molecules in the material are polarized and change along with the change of the polarity of the external alternating electromagnetic field, and a plurality of polar molecules are frequently subjected to friction loss mutually, so that the electromagnetic energy is converted into heat energy to heat the material.
However, the existing slot antenna has a limited radiation area, and interference exists between slot radiation fields, so that the spatial field distribution is not uniform, which causes uneven heating of materials.
Disclosure of Invention
In view of the above, it is desirable to provide a power distribution system for a microwave heating apparatus, which solves or alleviates the technical problems in the prior art, and at least provides a useful choice.
The technical scheme of the embodiment of the invention is realized as follows: a power distribution system for a microwave heating device comprises a power distribution mechanism and a leaky-wave antenna mechanism, wherein the power distribution mechanism comprises a heating cavity, a first second divider, a straight waveguide, a second divider, a first bent waveguide, a triangular metal tuning element and a thin plate metal tuning element;
the utility model discloses a microwave oven heating cavity, including heating cavity, first two distributors of front side fixedly connected with, the equal fixedly connected with straight waveguide in both sides of first two distributors, two the equal fixedly connected with second distributor in one side that straight waveguide kept away from each other, the first curved waveguide of the equal fixedly connected with in top and the bottom of second distributor, the curved waveguide of rear side fixedly connected with second of first curved waveguide, the top of first two distributors is equipped with horizontal rectangular waveguide face, and first two distributors are located the intermediate position of heating cavity side, and its input port electric field is the horizontal direction, and the heating cavity is the cavity that the metal sheet encloses, and two tip set up the microwave suppressor respectively to open external space, form the input and the output port of heating cavity.
Preferably, the front side of the first second divider is provided with a first longitudinal rectangular waveguide surface, the inner side of the first second divider is embedded with a first cylindrical metal tuning element, the E-surface of the first second divider is in a T-shaped structure and consists of a section of transverse rectangular waveguide and a section of longitudinal rectangular waveguide, the longitudinal rectangular waveguide is vertically installed on the wide side of the transverse waveguide, and the longitudinal waveguide and the transverse waveguide are communicated with each other.
Further preferably, a triangular metal tuning element is embedded in the top of the first and second distributors.
Further preferably, a second cylindrical metal tuning element is embedded in the front side of the second distributor, a thin plate-shaped metal tuning element is embedded in the front side of the second distributor, the H-shaped surface of the second distributor is in a T-shaped structure and is composed of a section of transverse rectangular waveguide and a section of longitudinal rectangular waveguide, the longitudinal rectangular waveguide is vertically installed on the narrow side of the transverse waveguide, and the longitudinal waveguide and the transverse waveguide are communicated with each other.
Further preferably, the sides of the two corresponding second distributors close to each other are provided with second longitudinal rectangular waveguide surfaces.
Preferably, leaky-wave antenna mechanisms are arranged above and below the power distribution mechanism, and each leaky-wave antenna mechanism comprises a rectangular metal cavity, a slender gap and a horn-shaped tapered waveguide port;
the top and the bottom of the heating cavity are fixedly connected with two rectangular metal cavities, and the width of each rectangular metal cavity is within an m lambda to (m +) lambda interval (m is more than or equal to, and lambda is a wavelength).
Preferably, a plurality of elongated slots are arranged on the side, close to each other, of each of the two corresponding rectangular metal cavities, the radiation directions of the rectangular metal cavities face the inside of the heating cavity, and the length directions of the elongated slots are not parallel to the transmission direction of the leaky wave antenna.
Preferably, the two corresponding rectangular metal cavities are provided with horn-shaped tapered waveguide ports at the sides far away from each other, and the horn-shaped tapered waveguide ports are fixedly connected with the corresponding second curved waveguides.
Due to the adoption of the technical scheme, the embodiment of the invention has the following advantages:
the conveyor belt penetrates through the heating cavity, is positioned in the irradiation areas of the top leaky wave antenna and the bottom leaky wave antenna, penetrates through the microwave suppressor at the end part of the heating cavity to reach the external space, the radiation directions of the four rectangular metal cavities all face the inside of the heating cavity, the length direction of the elongated gap is not parallel to the transmission direction of the leaky wave antenna, microwave energy is radiated to the materials at the same time on the upper surface and the lower surface of the heated materials to heat the materials, the heating uniformity degree of the materials is greatly improved, the space field distribution is not uniform, the materials are heated unevenly, the available bandwidth of equipment is greatly widened, and the sensitivity of the equipment to the material characteristics is reduced.
The foregoing summary is provided for the purpose of description only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will be readily apparent by reference to the drawings and following detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or technical descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front perspective view of the present invention;
FIG. 2 is a perspective view of a first divider and a second divider of the present invention;
FIG. 3 is a perspective view of a second dispenser according to the present invention;
FIG. 4 is a perspective view of the leaky-wave antenna mechanism according to the present invention;
FIG. 5 is a graph of the reflection loss of materials of different dielectric constant/loss in the present invention when heated;
FIG. 6 is a graph showing the energy distribution of all materials when the dielectric constant/loss of the materials is 10/0.2 according to the present invention, which is the energy distribution of all materials added up along the direction of the conveyor belt.
Reference numerals: 1. a power distribution mechanism; 2. heating the cavity; 3. a first and a second distributors; 4. a straight waveguide; 5. a second dispenser; 6. a first curved waveguide; 7. a second curved waveguide; 8. a transverse rectangular waveguide surface; 9. a first longitudinal rectangular waveguide face; 10. a first cylindrical metal tuning element; 11. a triangular metal tuning element; 12. a second cylindrical metal tuning element; 13. a sheet metal tuning element; 14. a second longitudinal rectangular waveguide face; 15. a leaky-wave antenna mechanism; 16. a rectangular metal cavity; 17. an elongated slit; 18. a horn-shaped gradual change waveguide port.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1 to 4, an embodiment of the present invention provides a power distribution system for a microwave heating apparatus, including a power distribution mechanism 1 and a leaky wave antenna mechanism 15, where the power distribution mechanism 1 includes a heating cavity 2, a first second divider 3, a straight waveguide 4, a second divider 5, a first bent waveguide 6, a triangular metal tuning element 11, and a thin plate-shaped metal tuning element 13;
the front side of the heating cavity 2 is fixedly connected with a first second distributor 3, two sides of the first second distributor 3 are fixedly connected with straight waveguides 4, one side, far away from each other, of each of the two straight waveguides 4 is fixedly connected with a second distributor 5, the top and the bottom of the second distributor 5 are fixedly connected with first bent waveguides 6, the rear side of each first bent waveguide 6 is fixedly connected with a second bent waveguide 7, the top of the first second distributor 3 is provided with a transverse rectangular waveguide surface 8, the first second distributor 3 is positioned in the middle of the side surface of the heating cavity 2, the electric field of an input port of the first second distributor is in the horizontal direction, the heating cavity 2 is a cavity defined by metal plates, two end parts are respectively provided with microwave suppressors and are open to the external space to form an input port and an output port of the heating cavity 2, a conveyor belt penetrates through the inside of the heating cavity 2 and is positioned in the irradiation areas of top leaky-wave antennas and the bottom, passing through the microwave suppressor at the end of the heating chamber 2 to the external space.
In one embodiment, the front side of the first second divider 3 is provided with a first longitudinal rectangular waveguide surface 9, the inner side of the first second divider 3 is embedded with a first cylindrical metal tuning element 10, the E-surface of the first second divider 3 is in a T-shaped structure and is composed of a section of transverse rectangular waveguide and a section of longitudinal rectangular waveguide, the longitudinal rectangular waveguide is vertically installed on the wide side of the transverse waveguide, the longitudinal waveguide and the transverse rectangular waveguide are internally communicated, the longitudinal waveguide port is used as an input end, two ports of the transverse waveguide are used as output ends, and the waveguides work in the TE10 mode.
In one embodiment, the top of the first and second distributors 3 are embedded with a triangular metal tuning element 11.
In one embodiment, the front side of the second divider 5 is embedded with a second cylindrical metal tuning element 12, the front side of the second divider 5 is embedded with a thin plate-shaped metal tuning element 13, the H-shaped surface of the second divider 5 is a T-shaped structure and is composed of a section of transverse rectangular waveguide and a section of longitudinal rectangular waveguide, the longitudinal rectangular waveguide is vertically installed on the narrow side of the transverse waveguide, the longitudinal waveguide and the transverse waveguide are internally communicated, the longitudinal waveguide port is used as an input end, two transverse reporting ports are used as output ends, and the waveguides work in the TE10 mode.
In one embodiment, the sides of the two corresponding second dividers 5 that are close to each other are each provided with a second longitudinal rectangular waveguide surface 14.
In one embodiment, the leaky-wave antenna mechanism 15 is arranged above and below the power distribution mechanism 1, and the leaky-wave antenna mechanism 15 comprises a rectangular metal cavity 16, an elongated slot 17 and a horn-shaped tapered waveguide port 18;
the top and the bottom of the heating cavity 2 are both fixedly connected with two rectangular metal cavities 16, and the width of the rectangular metal cavities 16 is within the m lambda- (m + 1) lambda interval (m is more than or equal to 2, and lambda is the wavelength).
The invention is composed of a horn-shaped gradual change waveguide port 18, a rectangular metal cavity 16 and N (N is more than or equal to 3) slender slits 17 on one wide side surface of the rectangular metal cavity as shown in figure 5; the smaller opening surface of the horn-shaped gradual change waveguide opening 18 serves as an input end, and the larger opening surface serves as an output end and is connected with the rectangular metal cavity 16; the width of the metal cavity 16 is within an m lambda- (m + 1) lambda interval (m is more than or equal to 2, lambda is the wavelength), and microwaves are distributed in a multi-mode mainly in a TEm0 mode in the metal cavity; the length of the elongated slot 17 is much greater than 1 microwave wavelength; the length direction of the elongated slot 17 is perpendicular to the axial direction of the metal cavity; the spacing between the elongated slots 17 may or may not be equal.
In one embodiment, a plurality of elongated slots 17 are respectively arranged on the sides of the two corresponding rectangular metal cavities 16 close to each other, the radiation directions of the rectangular metal cavities 16 are both towards the inside of the heating cavity 2, and the length directions of the elongated slots 17 are not parallel to the transmission direction of the leaky wave antenna.
The size of the heating cavity 2 is 1m multiplied by 8m, 10 boxes of rectangular materials are uniformly placed in the heating cavity along the direction of the conveyor belt, the size of the materials is 0.4m multiplied by 0.2m multiplied by 0.6m, the dielectric constants/losses of the materials are respectively 5/0.1, 10/0.2 and 15/0.3, the reflection loss of the input end of the whole microwave heating device obtained through electromagnetic simulation at 915MHz is shown in figure 6, and the reflection loss of the heating device is lower than-10 dB within the range of 915 +/-10 MHz. When the dielectric constant and the loss are 10/0.2, the energy distribution of all the materials in the heating cavity 2 is accumulated along the direction of the conveyor belt to obtain the final energy of the materials, so that the energy distribution in the materials is uniform.
In one embodiment, the two corresponding rectangular metal cavities 16 are provided with flared tapered waveguide ports 18 on the sides away from each other, and the flared tapered waveguide ports 18 are fixedly connected with the corresponding second curved waveguides 7.
The invention is in operation: the conveyor belt penetrates through the heating cavity 2 and is positioned in the irradiation areas of the top leaky wave antenna and the bottom leaky wave antenna, the end part of the heating cavity 2 penetrates through the microwave suppressor to reach the external space, the radiation directions of the four rectangular metal cavities 16 all face the inside of the heating cavity 2, the length direction of the elongated gap 17 is not parallel to the transmission direction of the leaky wave antenna, microwave energy is radiated to the materials on the upper surface and the lower surface of the heated materials at the same time for heating, and the heating uniformity degree of the materials is greatly improved; the effective radiation surface of the leaky-wave antenna is far larger than that of a common slot antenna, so that materials are completely covered by the radiation surface, microwaves can be fully absorbed by the materials and converted into heat energy, the available bandwidth of equipment is greatly widened, and the sensitivity of the equipment to material characteristics is reduced.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive various changes or substitutions within the technical scope of the present invention, and these should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A power distribution system for a microwave heating apparatus, comprising a power distribution mechanism (1) and a leaky wave antenna mechanism (15), characterized in that: the power distribution mechanism (1) comprises a heating cavity (2), a first second divider (3), a straight waveguide (4), a second divider (5), a first bent waveguide (6), a triangular metal tuning element (11) and a thin plate metal tuning element (13);
the first and second distributors (3) of front side fixedly connected with of heating cavity (2), the equal fixedly connected with straight waveguide (4) in both sides of first and second distributors (3), two the equal fixedly connected with second distributor (5) in one side that straight waveguide (4) kept away from each other, the first curved waveguide (6) of the equal fixedly connected with in top and bottom of second distributor (5), the rear side fixedly connected with second curved waveguide (7) of first curved waveguide (6), the top of first and second distributors (3) is equipped with horizontal rectangular waveguide face (8).
2. A power distribution system for a microwave heating apparatus as in claim 1, wherein: the front side of the first second divider (3) is provided with a first longitudinal rectangular waveguide surface (9), and the inner side of the first second divider (3) is embedded with a first cylindrical metal tuning element (10).
3. A power distribution system for a microwave heating apparatus as in claim 1, wherein: and a triangular metal tuning element (11) is embedded at the top of the first divider and the second divider (3).
4. A power distribution system for a microwave heating apparatus as in claim 1, wherein: the front side of the second distributor (5) is embedded with a second cylindrical metal tuning element (12), and the front side of the second distributor (5) is embedded with a thin plate-shaped metal tuning element (13).
5. A power distribution system for a microwave heating apparatus as in claim 1, wherein: and one sides of the two corresponding second distributors (5) close to each other are provided with second longitudinal rectangular waveguide surfaces (14).
6. A power distribution system for a microwave heating apparatus as in claim 1, wherein: leaky-wave antenna mechanisms (15) are arranged above and below the power distribution mechanism (1), and each leaky-wave antenna mechanism (15) comprises a rectangular metal cavity (16), a long and thin gap (17) and a horn-shaped gradually-changed waveguide port (18);
the top and the bottom of the heating cavity (2) are both fixedly connected with two rectangular metal cavities (16).
7. A power distribution system for a microwave heating apparatus as in claim 6, wherein: and a plurality of elongated slits (17) are arranged on the sides, close to each other, of the two corresponding rectangular metal cavities (16).
8. A power distribution system for a microwave heating apparatus as in claim 6, wherein: and horn-shaped tapered waveguide ports (18) are arranged on one sides, far away from each other, of the two corresponding rectangular metal cavities (16), and the horn-shaped tapered waveguide ports (18) are fixedly connected with the corresponding second bent waveguides (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111570439.4A CN114269036A (en) | 2021-12-21 | 2021-12-21 | Power distribution system for microwave heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111570439.4A CN114269036A (en) | 2021-12-21 | 2021-12-21 | Power distribution system for microwave heating device |
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| Publication Number | Publication Date |
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| CN114269036A true CN114269036A (en) | 2022-04-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111570439.4A Pending CN114269036A (en) | 2021-12-21 | 2021-12-21 | Power distribution system for microwave heating device |
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| CN (1) | CN114269036A (en) |
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- 2021-12-21 CN CN202111570439.4A patent/CN114269036A/en active Pending
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