CN212137954U - Leakage coaxial device for uniformly heating solid material - Google Patents
Leakage coaxial device for uniformly heating solid material Download PDFInfo
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- CN212137954U CN212137954U CN202020894960.8U CN202020894960U CN212137954U CN 212137954 U CN212137954 U CN 212137954U CN 202020894960 U CN202020894960 U CN 202020894960U CN 212137954 U CN212137954 U CN 212137954U
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Abstract
The utility model relates to a microwave heating field indicates a reveal coaxial device for solid material even heating, has solved among the prior art heating environment among the prior art and has required high, the inhomogeneous problem of heating. The utility model is connected with a microwave generator and also comprises at least two groups of coaxial cables; the coaxial cable is transversely provided with a gap; the coaxial cable is connected with the microwave generator; the coaxial cable group and the heated object are arranged at intervals in a layered mode; the utility model discloses a reveal coaxial arrangement for solid material even heating sets up coaxial cable group and heated object through the interval of layering bearing structure, and the setting on the coaxial cable cracks the even radiation electromagnetic wave to form the electric field of homogeneous distribution outside the coaxial cable, and then all-round even radiation microwave energy, realize even heating; the utility model discloses do not receive the influence of heating environment, can deal with extensive even heating demand.
Description
Technical Field
The utility model relates to a microwave heating field especially indicates a reveal coaxial device that is used for solid material even heating.
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.
However, in the application of microwave heating, there is a problem that the heating uniformity of the object to be heated is poor.
In the prior art, there are many methods for solving the above problems, and the heating of the object in the heating chamber by microwaves is common, and not only the heating environment is greatly affected, but also the challenge of heating uniformity in industrial heating is not insignificant.
A new microwave heating apparatus solving the above problems is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a reveal coaxial arrangement for solid material even heating has solved among the prior art problem that the heating environment requires height, heating is inhomogeneous among the prior art.
The technical scheme of the utility model is realized like this: a leakage coaxial device for uniformly heating solid materials is connected with a microwave generator and also comprises at least two groups of coaxial cables; the coaxial cable is transversely provided with a gap; the coaxial cable is connected with the microwave generator; the coaxial cable is arranged in layers spaced from the heated object.
Further, the coaxial cable comprises a bidirectional radiation cable and a unidirectional radiation cable; the bidirectional radiation cable group is arranged on the middle layer; the single-phase radiation cable group is arranged on the upper layer and the lower layer.
Further, the slots of the bidirectional radiation cable are transversely arranged on two opposite sides of the coaxial cable; the slot of the single-phase radiation cable is transversely arranged on one side of the coaxial cable.
Furthermore, the gaps are arranged on the outer conductor of the coaxial cable at intervals, and the electric field distribution outside the gaps is uniform.
Furthermore, one end of the coaxial cable, which is far away from the microwave generator, is also provided with a short-circuit surface.
Further, the coaxial cable and the heated object are arranged in layers by a layered support structure.
Preferably, the slots are spaced apart by one-half of an operating wavelength.
Preferably, the coaxial cable is connected with the microwave generator through a microwave coaxial conversion device; the microwave coaxial conversion device comprises a magnetron, a coaxial connector and a conversion cavity, wherein the magnetron is connected with the coaxial connector, the coaxial connector is connected with the coaxial cavity, and the conversion cavity is used for feeding energy.
Further, the inner conductor of the coaxial connector is higher than the outer conductor; the inner conductor is in a rivet structure, and the radius of the inner conductor close to the output antenna part exceeds that of the inner conductor far away from the output antenna part; the part close to the output antenna is a nail cap part; the nail cap part is of a chamfer structure.
The utility model discloses a reveal coaxial arrangement for solid material even heating, set up coaxial cable and heated object through the interval of layered supporting structure, set up on the coaxial cable and slit the even radiation electromagnetic wave to form the electric field of homogeneous distribution outside the coaxial cable, and then all-round even radiation microwave energy, realize even heating; the utility model is not affected by the heating environment, and can meet the large-scale uniform heating requirement; the utility model connects with the microwave source through a microwave coaxial conversion device, which not only has simple and small structure, is convenient for the integration of the magnetron system, but also has high microwave output efficiency and is not easy to be influenced by the load; by providing the nut portion, the tip effect is effectively prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 these drawings without inventive exercise.
FIG. 1: the structure of the utility model is shown schematically;
FIG. 2: a schematic structure diagram of a coaxial cable;
FIG. 3: a heating effect diagram of a specific embodiment;
FIG. 4: the microwave coaxial conversion device is structurally schematic;
FIG. 5: the temperature distribution diagrams of the unidirectional radiation coaxial cable and the bidirectional radiation coaxial cable at different gap intervals;
FIG. 6: a graph of the relationship between the gap spacing and the reflected power of the unidirectional radiating coaxial cable and the bidirectional radiating coaxial cable;
FIG. 7: the relation graph of different gap widths and reflected power of the unidirectional radiation coaxial cable and the bidirectional radiation coaxial cable;
FIG. 8: the relation graph of the different slit cutting depths and the reflected powers of the unidirectional radiation coaxial cable and the bidirectional radiation coaxial cable;
wherein: 1. an outer conductor; 2. a gap; 3. a microwave coaxial conversion device; 4.1, unidirectional radiation coaxial cable; 4.2, bidirectional radiating coaxial cable; 5. an object to be heated; 6. a coaxial cable; 7. a magnetron; 8. A conversion chamber; 9. an inner conductor; 10. and a cap part.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The utility model discloses a leakage coaxial device for uniformly heating solid materials, which is connected with a microwave generator and comprises at least two groups of coaxial cables; the coaxial cable is transversely provided with a gap 2; the coaxial cable is connected with the microwave generator; the coaxial cable 6 is provided at a layered interval from the object 5 to be heated.
Further, the coaxial cable comprises a bidirectional radiation cable and a unidirectional radiation cable; the bidirectional radiation cable group is arranged on the middle layer; the single-phase radiation cable group is arranged on the upper layer and the lower layer.
Further, the slots 2 of the bidirectional radiation cable are transversely arranged on two opposite sides of the coaxial cable; the slot 2 of the single-phase radiation cable is transversely arranged on one side of the coaxial cable.
Furthermore, the slots 2 are arranged on the outer conductor 1 of the coaxial cable at intervals, and the electric field distribution outside the slots 2 is uniform.
Furthermore, one end of the coaxial cable, which is far away from the microwave generator, is also provided with a short-circuit surface.
Further, the coaxial cable 6 and the heated object 5 are arranged in layers by a layered support structure.
Preferably, the slots 2 are spaced one-half of an operating wavelength apart.
Preferably, the coaxial cable is connected with the microwave generator through a microwave coaxial conversion device 3; the microwave coaxial switching device 3 comprises a coaxial connector for connecting a magnetron 7 and a coaxial cavity and a switching cavity 8 for feeding energy.
Further, the inner conductor 9 of the coaxial connector is higher than the outer conductor 1; the inner conductor 9 is in a rivet structure, and the radius of the inner conductor 9 close to the output antenna part exceeds that of the inner conductor far away from the output antenna part; the portion close to the output antenna is a spike cap portion 10; the nut portion 10 is a chamfered structure.
The utility model provides a characteristic impedance of coaxial cable all is 50 omega, is the single mode of work in the TEM mould, and the energy is concentrated, and can reduce the loss in the transmission course and avoid the interference between the different modes.
For the higher order mode in the coaxial cable, the mode of the low-order waveguide mode is TE11Mode, for TE11Mode, having a cutoff wavelength, for transmitting TE only when the operating wavelength of the electromagnetic wave is less than the cutoff wavelength11A wave of modes. And the operating wavelength is greater than the cutoff wavelength, a TEM mode wave is transmitted. So that the transmission of TEM wave needs to satisfy the formula[9]：
λmin≥π(a+b)
Wherein λminIs the minimum operating wavelength at which only the TEM mode exists, a is the radius of the inner conductor 9 of the coaxial cable and b is the radius of the outer conductor 1 of the coaxial cable.
As shown in the relationship diagrams of the widths, intervals, and cutting depths of the different gaps 2 of the unidirectional radiation coaxial cable 4.1 and the bidirectional radiation coaxial cable 4.2 and the relationship diagrams of the reflected power, for the unidirectional radiation coaxial cable, when the interval between the gaps 2 is 5.9cm, the electromagnetic field energy radiated between the gaps 2 is relatively consistent;
when the interval between the gaps 2 of the bidirectional radiation coaxial cables is 5.8cm, the bidirectional radiation coaxial cables have better consistency; the reflected power is smaller when the slot 2 radiated power is relatively uniform.
When the width of the slit 2 is more than 0.5cm, the increase in width does not greatly affect the reduction of reflection.
The greater the depth of cut of the slot 2, the more the radiated power and the less the reflection. This is because the greater the depth of cut, the longer the length of the slot 2 and the greater the range of current flow to cut the wall.
In the using process, a microwave generator, namely a microwave source is connected with the coaxial cable through the microwave coaxial conversion device 3, the slot on the coaxial cable is used for carrying out electromagnetic wave radiation, and whether the electric field distribution outside the coaxial cable is uniform or not is set; the purpose of uniform radiation of microwave energy is achieved.
Taking the heated solid catalyst as an example:
the catalyst can be used for treating waste gas, the catalyst reacts with gas after microwave heating to realize harmless emission, the catalyst material heated by the whole cavity is three layers, each layer of catalyst can be two by two, and the coaxial cables 6 have four layers in total, wherein the middle two layers of coaxial cables are upper and lower bidirectional radiation cable sets, and the uppermost layer and the lowermost layer of coaxial cables are unidirectional radiation cable sets.
The interval of the gaps 2 of the unidirectional radiation coaxial cable 4.1 is 5.9cm, the width of the gap 2 is 1cm, and the cutting depth of the gap 2 is 1.4 cm; the interval of the gaps 2 of the bidirectional radiation coaxial cable 4.2 is 5.8cm, the width of the gap 2 is 0.8cm, and the cutting depth of the gap 2 is 1.4 cm; the distance from the coaxial cable to the solid catalyst was 2.8 cm.
The material properties of the solid catalyst are given in the table below.
Material properties
As shown in fig. 3, which is a heating result of the three-layered solid catalyst heated in the chamber, the uppermost layer of the three-layered heated material is identical to the lowermost layer due to the symmetrical structure. The heating effect of the upper and lower coaxial layers is symmetrical due to the upper and lower two-way radiation leakage coaxial layers of the middle layer, the heating result is the best, and the heating objects of the uppermost layer and the lowermost layer have asymmetric temperature distribution due to the difference of the gaps 2 between the two-way radiation leakage coaxial layers and the one-way radiation leakage coaxial layers.
From the temperature distribution, it can be seen that the catalyst has the best heating effect in the middle and slightly worse edge positions. This is caused by the fact that the central part is exposed to the largest radiation area, while the edge is located further away from the radiation slot 2.
The top and bottom two coaxial layers have an input power of 500 watts, while the middle two coaxial layers have an input power of 1000 watts. The total input power was 12000 watts and the total absorbed power was 11444 watts, giving a calculated energy absorption of 95.4%.
The utility model discloses a reveal coaxial arrangement for solid material even heating, set up coaxial cable 6 and heated object 5 through the interval of layered supporting structure, the setting on the coaxial cable cracks the even radiation electromagnetic wave to form the electric field of homogeneous distribution outside the coaxial cable, and then all-round even radiation microwave energy, realize even heating; the utility model is not affected by the heating environment, and can meet the large-scale uniform heating requirement; the utility model connects with the microwave source through a microwave coaxial conversion device 3, which not only has simple structure, small size, convenient integration of the magnetron 7 system, but also has high microwave output efficiency and is not easy to be influenced by the load; by providing the nut portion 10, the tip effect is effectively prevented.
Of course, without departing from the spirit and essence of the present invention, those skilled in the art should be able to make various corresponding changes and modifications according to the present invention, and these corresponding changes and modifications should fall within the scope of the appended claims.
Claims (9)
1. A leaky coaxial device for uniformly heating solid materials is connected with a microwave generator, and is characterized in that: at least two groups of coaxial cables are also included; the coaxial cable is transversely provided with a gap; the coaxial cable is connected with the microwave generator; the coaxial cable is arranged in layers spaced from the heated object.
2. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 1, wherein: the coaxial cable comprises a bidirectional radiation cable and a unidirectional radiation cable; the bidirectional radiation cable is arranged on the middle layer; the single-item radiation cable is arranged on the upper layer and the lower layer.
3. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 2, wherein: the slots of the bidirectional radiation cable are transversely arranged on two opposite sides of the coaxial cable; the slot of the single-phase radiation cable is transversely arranged on one side of the coaxial cable.
4. A leaky coaxial arrangement for uniform heating of solid material as claimed in any one of claims 1 to 3, wherein: the gaps are arranged on the outer conductor of the coaxial cable at intervals, and the electric field outside the gaps is uniformly distributed.
5. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 4, wherein: and one end of the coaxial cable, which is far away from the microwave generator, is also provided with a short circuit surface.
6. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 5, wherein: the coaxial cable and the heated object are arranged in layers by a layered support structure.
7. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 5 or 6, wherein: the gap spacing is one-half of an operating wavelength.
8. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 7, wherein: the coaxial cable is connected with the microwave generator through a microwave coaxial conversion device; the microwave coaxial conversion device comprises a magnetron, a coaxial connector and a conversion cavity, wherein the magnetron is connected with the coaxial connector, the coaxial connector is connected with the coaxial cavity, and the conversion cavity is used for feeding energy.
9. A leaky coaxial arrangement for uniform heating of solid material as claimed in claim 8, wherein: the inner conductor of the coaxial connector is higher than the outer conductor;
the inner conductor is in a rivet structure, and the radius of the inner conductor close to the output antenna part exceeds that of the inner conductor far away from the output antenna part;
the part close to the output antenna is a nail cap part;
the nail cap part is of a chamfer structure.
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| CN2020205692531 | 2020-04-16 | ||
| CN202020569253 | 2020-04-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113543395A (en) * | 2020-04-16 | 2021-10-22 | 中国石油化工股份有限公司 | Leakage coaxial device for uniformly heating solid material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113543395A (en) * | 2020-04-16 | 2021-10-22 | 中国石油化工股份有限公司 | Leakage coaxial device for uniformly heating solid material |
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