CN104923141A - Single-mode microwave chemical device based on extended rectangular waveguide size - Google Patents
Single-mode microwave chemical device based on extended rectangular waveguide size Download PDFInfo
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- CN104923141A CN104923141A CN201510318946.7A CN201510318946A CN104923141A CN 104923141 A CN104923141 A CN 104923141A CN 201510318946 A CN201510318946 A CN 201510318946A CN 104923141 A CN104923141 A CN 104923141A
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Abstract
A single-mode microwave chemical device based on an extended rectangular waveguide size comprises a microwave source, a circulator, a bi-directional coupler and a tapered waveguide device which are sequentially arranged, wherein the tapered waveguide device comprises two tapered loudspeakers and a size-extended rectangular waveguide connected with the two tapered loudspeakers; centers of two E surfaces of the size-extended rectangular waveguide extend in opposite directions to form first cut-off waveguides, and quartz glass tubes are inserted into the size-extended rectangular waveguides through the first cut-off waveguides. The tapered loudspeakers with proper tapered angles are selected for connection after the large-size rectangular waveguide is selected, so that a higher-order mode which can be generated in certain situations is eliminated, the microwave chemical reaction device is in a TE10 mode, the microwave heating controllability is greatly improved, microwave heating repeatability is also greatly improved, and the single-mode microwave chemical device is especially applicable to production or researches, such as researches on microwave chemical reaction mechanisms, with high requirements for repeatability.
Description
[technical field]
The invention belongs to Pulse width field, relate to a kind of single mold microwave chemical devices, be specifically related to a kind of based on the single mold microwave chemical devices after the extension of rectangular waveguide size.
[background technology]
In recent years, microwave energy is efficient as one, and the clean energy is widely used in different field, wherein heating using microwave is as a kind of major way of Pulse width, and it is high that it has the efficiency of heating surface, and speed is fast, non-contact thermal, inside and outside simultaneously carrying out such as heats at the advantage.Heating using microwave is widely used in chemical reaction, but interactional mechanism is not clear between microwave and chemical reaction, and in the process of heating using microwave chemical reaction, create a lot of controversial problem, therefore create new subject a---microwave chemical.The rectangular waveguide single mode heater of being used widely in microwave chemistry device, compared to the microwave chemical reaction apparatus with multimode cavity, it has homogeneous heating, and controllability is high, repeatable high.The region that existing rectangular waveguide single mode heater can be approximated to be homogeneous heating is limited and very narrow, and the microwave chemical reaction experimental provision so just limiting waveguide type can the volume of chemical reaction reagent of one-time heating.Such as be operated in the standard rectangular waveguide BJ-58 of 5.8GHz, in it, sectional dimension is 40.4mm*20.2mm, can be approximated to be the region of homogeneous heating just in the region that broadside (40.4mm) middle part is very narrow.According to the difference of actual requirement, the area size that can be approximated to be homogeneous heating is also different, but the maximum region that generally can not exceed broadside central authorities ± 5mm.Such microwave can directly act on the height of chemical reaction and the narrow limit consistent size of waveguide, and the chemical reagent volume that can simultaneously heat through calculating mostly most is 3.14*5*5*20.2mm
3namely about 1.58 milliliters, so little capacity causes also requiring very high precision to the volume of each composition of chemical reaction.Improve the difficulty of experiment, the rapidity of simultaneously heating using microwave also can make solvent soon temperature have little time the temperature that controls just to exceed needs or even seethed with excitement.
[summary of the invention]
For the problems referred to above, the object of the present invention is to provide a kind of based on the single mold microwave chemical devices after the extension of rectangular waveguide size.
The present invention is achieved by the following technical solutions, provides a kind of based on the single mold microwave chemical devices after the extension of rectangular waveguide size, comprise the microwave source, circulator, the tapered waveguide device that set gradually;
Described circulator has three ports, one of them port is connected by standard rectangular waveguide with microwave source, another port is provided with the dual directional coupler for monitoring the microwave power entering tapered waveguide device and reflect from tapered waveguide device, and the 3rd port is provided with for absorbing the first matched load reflecting microwave from tapered waveguide device;
Described gradual change rectangular waveguide body device comprises: two gradual change loudspeaker, have two H faces and E face size extension rectangular waveguide, and the flared rim of described each gradual change loudspeaker is connected with the edges at two ends of size extension rectangular waveguide respectively; One in described two gradual change loudspeaker is connected by standard rectangular waveguide with dual directional coupler, the end of another gradual change loudspeaker is provided with for absorbing the second matched load spreading out of microwave from tapered waveguide, and this second matched load is connected by standard rectangular waveguide with gradual change loudspeaker; The first cut-off waveguide is respectively extended in opposite direction in the corresponding center, E face of described size extension rectangular waveguide, this first cut-off waveguide is connected with size extension rectangular waveguide, and being inserted with quartz glass tube in this first cut-off waveguide, this quartz glass tube outer wall and cut-off waveguide inwall fit, end is stretched out in the first cut-off waveguide end.
Especially, the second cut-off waveguide of an accommodation infrared probe is respectively extended at the center, H face that described size extension rectangular waveguide is corresponding respectively in opposite direction.
Especially, described size extension rectangular waveguide is the rectangular waveguide that H face stretches or E face stretches or H face and E face stretch simultaneously.
Especially, described microwave source is magnetron, travelling-wave tubes, klystron.
Compared to prior art, the invention provides a kind of based on the single mold microwave chemical devices after the extension of rectangular waveguide size, the setting of size extension rectangular waveguide, makes the volume of the chemical reaction solution of one-time heating increase, thus the uniformity of heating using microwave is significantly improved; Eliminate higher mode when higher mode originally can be produced, make the pattern in this microwave chemical reaction apparatus be TE
10mould, makes the controllability of heating using microwave obtain great lifting, and the repeatability of heating using microwave there has also been very large improvement, is specially adapted to the exigent production of repeatability or research, as the research of microwave chemical reaction mechanism.
[accompanying drawing explanation]
Fig. 1 is a kind of structural representation based on the single mold microwave chemical devices after the extension of rectangular waveguide size of the present invention;
Fig. 2 is a kind of structural representation based on tapered waveguide device in the single mold microwave chemical devices after the extension of rectangular waveguide size of the present invention;
Fig. 3 is a kind of electric field sectional drawing based on adopting H face gradual change loudspeaker uniaxial direct tensile in the single mold microwave chemical devices after the extension of rectangular waveguide size of the present invention;
There is schematic diagram in what the rectangular waveguide adopting H face to stretch in the single mold microwave chemical devices of Fig. 4 after to be that the present invention is a kind of extend based on rectangular waveguide size eliminated higher mode;
Fig. 5 is the schematic diagram that a kind of rectangular waveguide quartz glass tube place based on adopting H face to stretch in the single mold microwave chemical devices after the extension of rectangular waveguide size of the present invention eliminates the existence of higher mode;
Fig. 6 is the electric field sectional drawing of a kind of rectangular waveguide uniaxial direct tensile based on adopting E face to stretch in the single mold microwave chemical devices after the extension of rectangular waveguide size of the present invention;
There is schematic diagram in what the rectangular waveguide adopting E face to stretch in the single mold microwave chemical devices of Fig. 7 after to be that the present invention is a kind of extend based on rectangular waveguide size eliminated higher mode;
Fig. 8 is the schematic diagram that a kind of rectangular waveguide quartz glass tube place based on adopting E face to stretch in the single mold microwave chemical devices after the extension of rectangular waveguide size of the present invention eliminates the existence of higher mode;
There is schematic diagram in what the rectangular waveguide adopting H face and E face simultaneously to stretch in the single mold microwave chemical devices of Fig. 9 after to be that the present invention is a kind of extend based on rectangular waveguide size eliminated higher mode;
Figure 10 is the schematic diagram that a kind of rectangular waveguide quartz glass tube place based on adopting H face and E face to stretch in the single mold microwave chemical devices after the extension of rectangular waveguide size simultaneously of the present invention eliminates the existence of higher mode.
[detailed description of the invention]
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in more detail.
Refer to Fig. 1-Fig. 2, the invention provides a kind of based on the single mold microwave chemical devices after the extension of rectangular waveguide size, comprise the microwave source 1, circulator 2, the tapered waveguide device 3 that set gradually;
Described circulator 2, electromagnetic transmission is circulated along one direction, this circulator 2 has three ports, one of them port is connected by standard rectangular waveguide (not indicating in figure) with microwave source 1, another port is provided with the dual directional coupler 4 for monitoring the microwave power entering tapered waveguide device 3 and reflect from tapered waveguide device 3, 3rd port is provided with for absorbing the first matched load 5 reflecting microwave from tapered waveguide device 3, thus the electromagnetic wave reflected from tapered waveguide device 3 is spread out of in 12, the matched load 13 being connected circulator port 12 absorbs, protect microwave source 10,
Described gradual change rectangular waveguide body device 1 comprises: two gradual change loudspeaker 6, have two H faces and E face size extension rectangular waveguide 7, and the flared rim of described each gradual change loudspeaker 6 is connected with the edges at two ends of size extension rectangular waveguide 7 respectively; One in described two gradual change loudspeaker 6 is connected by standard rectangular waveguide (not indicating in figure) with dual directional coupler 4, the end of another gradual change loudspeaker 6 is provided with for absorbing the second matched load 8 spreading out of microwave from tapered waveguide 1, and this second matched load 8 is connected by standard rectangular waveguide (not indicating in figure) with gradual change loudspeaker 6; The second cut-off waveguide 11 of an accommodation infrared probe is respectively extended at the corresponding center, H face of described size extension rectangular waveguide 7 respectively in opposite direction, the first cut-off waveguide 9 is respectively extended at corresponding center, E face in opposite direction, this first cut-off waveguide 9 is connected with size extension rectangular waveguide 7, and being inserted with quartz glass tube 10 in this first cut-off waveguide 9, this quartz glass tube 10 outer wall and cut-off waveguide 7 inwall fit, end is stretched out in the first cut-off waveguide 9 end.
Especially, described size extension rectangular waveguide 7 is the rectangular waveguide that H face stretches or E face stretches or H face and E face stretch simultaneously.
Especially, described microwave source 1 is magnetron, travelling-wave tubes, klystron.
A kind of microwave chemical reaction apparatus based on this type of single mold microwave chemical devices after the extension of rectangular waveguide size provided by the invention can be applied to multi-frequency, such as 915MHz, 2.45GHz, 5.8GHz etc., wherein choosing of the H face of size extension rectangular waveguide 7 or the pulled out condition in E face or H face and E face and gradual change loudspeaker is that operating frequency as required carries out designing.By the following examples technical scheme of the present invention is explained, the rectangular waveguide that embodiment is selected is many times of sizes of former BJ-58 standard rectangular waveguide, namely simulates in computer software the H face of former BJ-58 standard rectangular waveguide or E face or H face and E face and stretches.
Embodiment 1
By stretching to the H face of former BJ-58 standard rectangular waveguide, the size extension rectangular waveguide 7, Fig. 3 obtained after the stretching of H face is the electric field sectional drawing of the rectangular waveguide after H face stretches, and as shown in Figure 3, rectangular waveguide H face creates higher mode after stretching, afterwards according to the narrow limit size of size extension rectangular waveguide 7, the gradual change loudspeaker choosing corresponding opening angle connect, obtain gradual change rectangular waveguide body device 1, afterwards it is assembled according to device provided by the invention, obtain the single mold microwave chemical devices after extending based on rectangular waveguide size, obtain Fig. 4 by experiment, Fig. 5, by Fig. 4, Fig. 5 is known, after the H face of rectangular waveguide is stretched, choose suitable gradual change loudspeaker, eliminate while increasing rectangular waveguide H face size and therefore change and the higher mode caused, namely the existence of higher mode is eliminated, only remaining TE
10mould.Only having TE
10under the existent condition of single mode, increase TE
10the region of mould homogeneous heating, namely increase disposable can the volume of chemical reaction reagent of homogeneous heating.
Embodiment 2
By stretching to the E face of former BJ-58 standard rectangular waveguide, the size extension rectangular waveguide 7, Fig. 6 obtained after the stretching of E face is the electric field sectional drawing of the rectangular waveguide after E face stretches, and as shown in Figure 6, rectangular waveguide E face creates higher mode after stretching, the narrow limit size of the rectangular waveguide of size extension afterwards 7, the gradual change loudspeaker choosing corresponding opening angle connect, obtain gradual change rectangular waveguide body device 1, afterwards it is assembled according to device provided by the invention, obtain the single mold microwave chemical devices after extending based on rectangular waveguide size, obtain Fig. 7 by experiment, Fig. 8, by Fig. 7, Fig. 8 is known, after the E face of rectangular waveguide is stretched, choose suitable gradual change loudspeaker, eliminate while increasing rectangular waveguide H face size and therefore change and the higher mode caused, namely the existence of higher mode is eliminated, only remaining TE
10mould.Only having TE
10under the existent condition of single mode, increase TE
10the region of mould homogeneous heating, namely increase disposable can the volume of chemical reaction reagent of homogeneous heating.
Embodiment 3
By stretching to the H face of former BJ-58 standard rectangular waveguide and E face simultaneously, obtain H face and E face stretch simultaneously after size extension rectangular waveguide 7, afterwards according to the narrow limit size of size extension rectangular waveguide 7, the gradual change loudspeaker choosing corresponding opening angle connect, obtain gradual change rectangular waveguide body device 1, afterwards it is assembled according to device provided by the invention, obtain the single mold microwave chemical devices after extending based on rectangular waveguide size, obtain Fig. 9 by experiment, Figure 10, by Fig. 9, Figure 10 is known, after the H face of rectangular waveguide and E face are stretched simultaneously, choose suitable gradual change loudspeaker, eliminate while increasing rectangular waveguide H face and E face size and therefore change and the higher mode caused, namely the existence of higher mode is eliminated, only transmit single mode.
The rectangular waveguide (i.e. size extension rectangular waveguide 7) that the present invention increases by taking the gradual change loudspeaker size for connection of certain angle, the size extension rectangular waveguide 7 of this increased in size can be that H face size increases, also can be that E face size increases, can also be the rectangular waveguide that E face and H face increase simultaneously.When the rectangular waveguide that size increases and gradual change loudspeaker draw angle are chosen suitable, higher mode can be made to have encouraged, in device, only transmit TE
10mould.But inappropriate draw angle can not eliminate higher mode, the draw angle of connection loudspeaker corresponding under different expansion size is different.
The key of implementing measure of the present invention is exactly choosing of loudspeaker angle as known from the above, for the size extension rectangular waveguide 7 of different E faces and H face increased in size, there is no fixing loudspeaker angular range, choosing of this loudspeaker angle needs first to obtain according to business software or program calculation, determine final angle by optimizing contrast, the size extension rectangular waveguide 7 after choosing suitable gradual change loudspeaker afterwards and stretching carries out being connected.
Should be understood that, in those skilled in the art, can be improved according to the above description or convert, and all these improve and convert the protection domain that all should belong to claims of the present invention.
Claims (4)
1. the single mold microwave chemical devices after extending based on rectangular waveguide size, is characterized in that, comprises the microwave source (1), circulator (2), the tapered waveguide device (3) for propagation of electromagnetic waves that set gradually;
Described circulator (2) has three ports, one of them port is connected by standard rectangular waveguide with microwave source (1), another port is provided with the dual directional coupler (4) of the microwave power entering tapered waveguide device (3) for monitoring and reflect from tapered waveguide device (3), and the 3rd port is provided with for absorbing the first matched load (5) reflecting microwave from tapered waveguide device (3);
Described gradual change rectangular waveguide body device (1) comprising: two gradual change loudspeaker (6), have two H faces and E face size extension rectangular waveguide (7), and the flared rim of described each gradual change loudspeaker (6) is connected with the edges at two ends of size extension rectangular waveguide (7) respectively; One in described two gradual change loudspeaker (6) is connected by standard rectangular waveguide with dual directional coupler (4), the end of another gradual change loudspeaker (6) is provided with for absorbing the second matched load (8) spreading out of microwave from tapered waveguide (1), and this second matched load (8) is connected by standard rectangular waveguide with gradual change loudspeaker (6); The first cut-off waveguide (9) is respectively extended at the center, E face that described size extension rectangular waveguide (7) is corresponding in opposite direction, this first cut-off waveguide (9) is connected with size extension rectangular waveguide (7), and being inserted with quartz glass tube (10) in this first cut-off waveguide (9), this quartz glass tube (10) outer wall and cut-off waveguide (7) inwall fit, end is stretched out in the first cut-off waveguide (9) end.
2. according to claim 1 a kind of based on the single mold microwave chemical devices after the extension of rectangular waveguide size, it is characterized in that, second cut-off waveguide (11) of an accommodation infrared probe is respectively extended at the center, H face that described size extension rectangular waveguide (7) is corresponding respectively in opposite direction.
3. according to claim 1 a kind of extend based on rectangular waveguide size after single mold microwave chemical devices, it is characterized in that, described size extension rectangular waveguide (7) is the rectangular waveguide that H face stretches or E face stretches or H face and E face stretch simultaneously.
4. according to claim 1 a kind of extend based on rectangular waveguide size after single mold microwave chemical devices, it is characterized in that, described microwave source (1) is magnetron, travelling-wave tubes, klystron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510318946.7A CN104923141A (en) | 2015-06-11 | 2015-06-11 | Single-mode microwave chemical device based on extended rectangular waveguide size |
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|---|---|---|---|
| CN201510318946.7A CN104923141A (en) | 2015-06-11 | 2015-06-11 | Single-mode microwave chemical device based on extended rectangular waveguide size |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106850085A (en) * | 2016-12-29 | 2017-06-13 | 西北核技术研究所 | A kind of device of test material radio-frequency responsive performance |
| CN107308895A (en) * | 2017-06-09 | 2017-11-03 | 四川大学 | A kind of thermostatic type microwave continuous flow reactor |
-
2015
- 2015-06-11 CN CN201510318946.7A patent/CN104923141A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106850085A (en) * | 2016-12-29 | 2017-06-13 | 西北核技术研究所 | A kind of device of test material radio-frequency responsive performance |
| CN106850085B (en) * | 2016-12-29 | 2023-07-21 | 西北核技术研究所 | Device for testing radio frequency response performance of material |
| CN107308895A (en) * | 2017-06-09 | 2017-11-03 | 四川大学 | A kind of thermostatic type microwave continuous flow reactor |
| CN107308895B (en) * | 2017-06-09 | 2019-12-24 | 四川大学 | Constant-temperature microwave continuous flow reactor |
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Application publication date: 20150923 |