CN202725161U - Closed tunable-frequency resonant type microwave reaction chamber - Google Patents
Closed tunable-frequency resonant type microwave reaction chamber Download PDFInfo
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- CN202725161U CN202725161U CN 201220297926 CN201220297926U CN202725161U CN 202725161 U CN202725161 U CN 202725161U CN 201220297926 CN201220297926 CN 201220297926 CN 201220297926 U CN201220297926 U CN 201220297926U CN 202725161 U CN202725161 U CN 202725161U
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- outer conductor
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Abstract
A closed tunable-frequency resonant type microwave reaction chamber belongs to the field of microwave energy application technology. The closed tunable-frequency resonant type microwave reaction chamber comprises an outer conductor (1), an inner conductor (2), a closed cap (3) and a feeder line in coaxial mode (4). The outer conductor (1) is a cylinder metal chamber, the inner conductor (2) keeps electrically contacting the outer conductor (1) by passing through bottom holes (11), and the closed cap (3) keeps electrically contacting the outer conductor (1) through screws. The feeder line (4) passes through a feed hole (32) coaxially to enable the closed cap (3) to electrically contact a coaxial feed outer conductor (42). The closed tunable-frequency resonant type microwave reaction chamber has the advantages of being made based on the TM010 cylinder resonant chamber principle to achieve frequency reconfiguration within a wider range in a continuous frequency adjustment mode without any blind area, and simple in structure to be suitable for research and application demand of wide-band microwave reaction and of application value for accurately perceiving effects of frequency over microwave reaction and guiding relevant processes.
Description
Technical background
The utility model belongs to the microwave energy applied technical field, particularly the resonant mode microwave reaction chamber of frequency reconfigurable.
Background technology
At present, HIGH-POWERED MICROWAVES has been widely used in the occasions such as heating, medical treatment, drying, plated film, environmental protection, auxiliary extraction, obtains better effect.For the basic principle of cognitive microwave energy application and microwave chemical reaction, the researcher need to utilize the microwave reaction device, and the reaction mechanism of a small amount of sample finally instructs industrial large-scale application under the further investigation different condition.
Along with going deep into gradually of research and application, it is found that microwave frequency is extremely important to reaction effect.For example, a certain sample is relevant with microwave frequency to the absorption of microwave, namely under a certain frequency, can better microwave energy absorbing, and improve reaction efficiency.Therefore, wish to carry out under the different microwave frequencies, the correlative study of microwave reaction, thereby the optimum frequency of accurate cognitive different material microwave reaction, this has just proposed Secretary to the microwave reaction device, i.e. the operating frequency restructural.
At present, small-scale microwave reaction device is existing multiple, and it is made of three major parts usually: microwave source, microwave transmission system, microwave reaction chamber.The microwave reaction device of frequency reconfigurable to the requirement of this three part is respectively: the exportable wide band HIGH-POWERED MICROWAVES of microwave source, and microwave transmission system can be supported the transmission of broadband microwave, the microwave reaction chamber can be used in broad frequency range.(referring to: Jin Qinhan, Dai Shushan, Huang Kama work " microwave chemical ", chapter 4 the 4th joint, Science Press, 1999.）
(1) generally adopt electron tube that power output is provided in the existing microwave reaction device, but narrower because of its bandwidth of operation, can't satisfy the requirement of frequency reconfigurable.Therefore, need to adopt signal generator in conjunction with the method for high-gain solid-state amplifier, produce larger microwave output power in very wide working band, the existing off-the-shelf of Vehicles Collected from Market can be for buying.
(2) when the microwave transmission system through-put power is lower than 500W, can adopt coaxial transmission line to transmit, compare the higher waveguiding structure of power capacity, the spendable frequency band range of coaxial transmission line is extremely wide.Simultaneously, required additional device in the microwave reaction device such as coupler, circulator etc., also can adopt coaxial transmission line to realize bandwidth work.
(3) under limited input power, reach the correlated response condition, existing microwave reaction chamber adopts resonance manner to realize usually, and resonance only also means and can work in a certain CF.On the other hand, in view of the wide-band microwave source only can produce the power output that is lower than 1000W, the electric field enlarge-effect of utilizing resonator is to finish the key of frequency reconfigurable microwave reaction experiment.To sum up, existing resonant mode reaction chamber can only can't satisfy the requirement of frequency reconfigurable a frequency normal operation, can only cover by the reaction chamber of a plurality of different sizes some discrete operating frequencies, and is with high costs, uses inconvenience.Therefore, need to develop the novel microwave reaction chamber, possess the ability that produces resonance under the different frequency.
Summary of the invention
The utility model provides a kind of closed frequency-tunable type micro-wave reaction chamber that shakes, and can utilize same reaction chamber structure to come research and the application demand of covering wide frequency band microwave reaction, and accurate cognitive frequency and guides related process to the effect of microwave reaction.
To achieve these goals, the technical solution of the utility model is:
A kind of closed frequency-tunable type micro-wave reaction chamber that shakes as shown in Figure 1, comprises outer conductor 1, inner wire 2, closing cap 3, feed coaxial 4.Outer conductor 1 is a cylindrical metal cavity, and its center, bottom has a band internal thread bottom outlet 11.Inner wire 2 is for being with externally threaded cylinder, and the screw-internal thread fit of inner wire 2 by self external screw thread 21 and outer conductor 1 bottom outlet 11 makes outer conductor 1 and inner wire 2 keep electrically contacting and be convenient to adjust inner wire 2 and enter length in the outer conductor 1.Closing cap 3 cooperates with the internal thread 12 at outer conductor 1 top by self external screw thread makes outer conductor 1 and closing cap 3 keep electrically contacting.Be connected with handle 31 on the closing cap 3, be convenient to turn closing cap 3.Feed coaxial 4 is made of feed coaxial inner conductor 41, feed coaxial outer conductor 42 and filled media between the two 43; The end of feed coaxial inner conductor 41 has a coaxial embedding mouth 411, feed coaxial outer conductor 42 end portion to have joint screw thread 421, and coaxial embedding mouth 411 is convenient to feed coaxial 4 with joint screw thread 421 and is linked to each other with external input port; The front end of feed coaxial inner conductor 41 is feed disk 412 or feed hemisphere 413.Closing cap 3 centers have a tapped power feed hole 32, the screw-internal thread fit in the external screw thread 422 of feed coaxial 4 by feed coaxial outer conductor 42 front ends and closing cap 3 apex drive holes 32 so that closing cap 3 and feed coaxial outer conductor 42 keep electrically contacting and be convenient to adjust the length that feed coaxial 4 enters in the outer conductor 1.
In the above-mentioned reaction chamber technical scheme, inner wire 2 topside areas more greatly can be directly placing response sample thereon; Also can fix on the inner wire top a barrel-shaped pallet 5 with the placing response sample.The mode that barrel-shaped pallet 5 is fixed in inner wire 2 tops has several: 1) bottom of pallet 5 has 51, three fixed cylinder of three fixed cylinder 51 and mutually agrees with (shown in Fig. 3,4) with corresponding three the interior fluted columns 22 in inner wire 2 tops; 2) bottom of pallet 5 has an interior fluted column 52, and interior fluted column 52 agrees with fixing (as shown in Figure 5) with inner wire 2 tops; 3).The bottom of pallet 5 has an interior fluted column 52, and interior fluted column 52 agrees with fixing (as shown in Figure 6) with inner wire 2 tops by screw thread.
Realize that microwave reaction generally need to apply the HIGH-POWERED MICROWAVES signal to sample, the electrovacuum class microwave source working band more than the power output 1kW is usually very narrow, but and the solid state microwave sources power output of wideband operation is relatively low.Therefore, frequency reconfigurable microwave reaction device need adopt the wide-band microwave source, reaches the microwave energy of reaction needed by the electric field enlarge-effect of resonator.The utility model utilizes TM
010The cylinder resonator principle, when the length of reaction chamber during less than 2.03 times of radius, TM
010Replace TE
111Mould becomes resonance master mould.At this moment, its internal electric field is standing wave and distributes, and electric field is maximum near the cavity central axis, has converged most microwave energies, can satisfy microwave reaction power demand condition under less input power condition.
In the utility model, the closing cap resonant cavity inner wire of resonator needs to regulate simultaneously to change resonant frequency, so that have identical height at each resonant frequency place inner wire apart from closing cap, namely the response sample amount that can place of each frequency place is consistent; Closing cap screws in corresponding highest frequency when maximum, be about 1/10th of resonant frequency wavelength this moment apart from cavity bottom, closing cap screws in corresponding low-limit frequency when minimum, be about 1/5th of resonant frequency wavelength this moment apart from cavity bottom, the sealing thread length on the outer conductor inwall should be greater than this requirement; The frequency modulation reach of inner wire is definite by the frequency range of required covering, and the maximum length that inner wire enters outer conductor is 1/7th of low-limit frequency corresponding wavelength, and inner wire does not stretch at the highest frequency place; Inner wire the latter half frequency modulation screw thread and outer conductor bottom centre hole threaded engagement can move up and down by this bottom outlet and regulate inner wire and enter height in the outer conductor, cooperate the corresponding movement of closing cap, realize the variation of frequency; Screw thread is dome, avoids point discharge.
The inner wire radius of the utility model reaction chamber, the design of outer conductor inside radius will consider following problems: (1) reaction chamber need work in TM
010Pattern also suppresses other patterns, and this just requires the lowest operating frequency the longest corresponding chamber length should be less than 2.03 times of the inside radius of outer conductor, i.e. L
0＜2.03a
0, L wherein
0, a
0Be respectively the longest chamber length of resonator and the inside radius of outer conductor; (2) for TM
010There is not the maximum of quality factor in the mould cylinder resonator, and quality factor are with 2a
0/ L
0The increase dullness reduce, high quality factor can make reaction chamber can produce larger electric field under the input power same case, realizes better microwave reaction, reduces energy consumption, therefore should weigh cavity size and quality factor; (3) a
0Be about 1/2.613rd of maximum operating frequency institute corresponding wavelength, inner wire is actual to be tuning wand, but value is larger, generally is no more than 0.9a
0
The utility model adopts fed by coaxial probe to cover larger frequency range.In order to further expand operating frequency range, can adopt the similar feed coaxial fitting of a plurality of structures, its inner wire is different than the length of outer conductor, need change use when covering different frequency bands; The feed screw thread of feed coaxial outer conductor and closing cap power feed hole threaded engagement can change the length that the coaxial integral body of feed enters resonator, thereby realize the coupling of different frequency point in the frequency band.The microwave power of high-power microwave source output is by the coaxial cable input resonator, and the coaxial embedding mouth of feed coaxial inner conductor end, the joint screw thread of outer conductor end portion consist of corresponding supporting structure in the lump, are convenient to link to each other with external input port.According to the difference of external input port model, can regulate the coaxial inner and outer conductor size of feed and structure.
The utility model can adopt or not adopt pallet.If adopt pallet to be used for the placing response sample, should the try one's best little absorption or do not absorb microwave of the pallet in microwave reaction chamber is therefore select low-loss material.Quartz absorbs hardly to microwave, and is also very little to the loss of microwave, so select quartzy material as pallet in this microwave reaction.Consider the distribution character of electric field in this resonator, the pallet shape of design should be the analogous shapes such as disk, drum, to improve microwave reaction efficient and microwave utilization rate.
The utlity model has following advantage:
1, compare the fixing resonant mode microwave reaction chamber of frequency, reaction chamber of the present utility model can be realized frequency reconfigurable work in the relative broad range, and it is continuous that its frequency is adjusted mode, and non-blind area need not the reaction chamber of a plurality of different operating frequencies.
2, in the frequency reconfiguration process, reaction chamber of the present utility model can be realized resonance at every turn under unique frequency, so can accurately judge the optimal frequency of microwave reaction.
3, in the frequency reconfiguration process, the Electric Field Distribution of the utility model resonator remains unchanged, concentrate on all the time in the cavity central axis cylindrical region, and this zone in distribution uniform, can provide uniform microwave irradiation for response sample.
4, reaction chamber of the present utility model is totally-enclosed, the impact healthy on operating personnel of having avoided microwave leakage to cause, and the environmental pollution that causes of microwave leakage etc.
Description of drawings
Fig. 1 is closed frequency-tunable that the utility model the provides type micro-wave reaction chamber structural representation that shakes.
Fig. 2 is closed frequency-tunable that the utility model provides coaxial 4 structural representations of feed in the type micro-wave reaction chamber that shake.
Fig. 3 is shake one of pallet and inner conductor structure schematic diagram in the type micro-wave reaction chamber of closed frequency-tunable that the utility model provides.
Fig. 4 is shake one of pallet and inner conductor structure schematic diagram (top view) in the type micro-wave reaction chamber of closed frequency-tunable that the utility model provides.
Fig. 5 is closed frequency-tunable that the utility model provides two of the pallet and inner conductor structure schematic diagram in the type micro-wave reaction chamber that shake.
Fig. 6 is closed frequency-tunable that the utility model provides three of the pallet and inner conductor structure schematic diagram in the type micro-wave reaction chamber that shake.
The specific embodiment
Embodiment 1: as shown in Figure 1, a kind of resonant mode microwave reaction chamber comprises outer conductor 1, inner wire 2, closing cap 3, feed coaxial 4.It is characterized in that, outer conductor 1 is a cylindrical metal cavity, and there is a cylinder bottom outlet 11 its center, bottom, and inwall has screw thread; Circular inner conductor 2 passes the inside that bottom outlet 11 enters outer conductor 1, the vaulted frequency modulation screw thread 21 of inner wire 2 the first half tools, with threaded engagement on bottom outlet 11 walls, make outer conductor 1 and inner wire 2 keep electrically contacting the length that while capable of regulating inner wire 2 enters in the outer conductor 1; Outer conductor 1 with axisymmetric closing cap 3 outer ledge threaded engagement, makes outer conductor 1 and closing cap 3 keep electrically contacting near the vaulted sealing thread 12 in top inner wall place, can control the relative position of closing cap 3 and outer conductor 1 simultaneously, changes the total height of cavity; Handle 31 is arranged on the closing cap 3, be convenient to turn closing cap 3; There is a power feed hole 32 closing cap 3 centers, and the rotational symmetric feed of axle coaxial 4 enters the inside of outer conductor 1 by power feed hole 32; Feed coaxial 4 is made of feed coaxial inner conductor 41, feed coaxial outer conductor 42 and filled media between the two 43; The end of feed coaxial inner conductor 41 has a coaxial embedding mouth 411, feed coaxial outer conductor 42 end portion to have joint screw thread 421, and these two structures are convenient to link to each other with external input port; The end that feed coaxial inner conductor 41 enters outer conductor 1 one ends has a feed end disc portion 412; The feed coaxial outer conductor 42 terminal outsides have feed screw thread 422, with threaded engagement on power feed hole 32 walls, so that closing cap 3 and feed coaxial outer conductor 42 keep electrically contacting the length that while capable of regulating feed coaxial 4 enters in the outer conductor 1.
Design as the basis take embodiment 1, the frequency of finishing 500MHz～1000MHz covers continuously.When guaranteeing that the resonator quality factor is higher, by appropriate design inner and outer conductor size so that cavity works in the main mould TM of circular waveguide resonator
010Pattern.Outer conductor 1 outside, inner wire 2 bottoms, coaxial 4 outsides of feed can cover heat insulation layer.
Specifically be of a size of: the inside radius 120mm of outer conductor 1, outer conductor 1 height L
0 Inner wire 2 radius 100mm stretch into the length L of outer conductor 1
1 Closing cap 3 is apart from the distance L at inner wire 2 tops
0-L
1Be fixed as 30mm; The thickness 5mm of outer conductor 1, material copper; The characteristic impedance of feed coaxial 4 is 50 Ω, feed coaxial inner conductor 41 radius 1.52mm, the inside radius 5.75mm of feed coaxial outer conductor 42, the thickness 1mm of feed coaxial outer conductor 42, material copper, the material of filled media 43 is polytetrafluoroethylene (PTFE), feed coaxial inner conductor 41 is than feed coaxial outer conductor 42 long D, get respectively 1mm, 3mm and 5mm, correspondence is designated as A, B and three joints of C, these three joints just can cover whole frequency band range, and the feed inner wire stretches into cavity one end end and connects disk 412, its radius 4.5mm, thickness 0.1mm; The length that feed coaxial outer conductor 42 stretches into outer conductor 1 is L.
Design result is under the Light Condition:
The length L that the present embodiment enters outer conductor 1 by regulating inner wire 2 is described
1The length L that enters outer conductor 1 with feed coaxial 4 can realize the continuous variation of 500MHz～1000MHz broad frequency range internal reaction chamber resonant frequency.
The Electric Field Distribution of different resonant frequencies is roughly the same, mainly concentrates on centered by the outer conductor central axis, in the cylindrical region between top cover and the inner wire, increases with cylindrical radius, and field intensity reduces gradually.Under 500W power initial conditions, getting resonant frequency is that 707MHz is the distribution that example illustrates the chamber internal electric field, and axis centered by the outer conductor central axis, radius are in the cylindrical region of 40mm, and the electric field virtual value is all greater than 4.82 * 10
5V/m; Axis centered by the outer conductor central axis, radius are in the cylindrical region of 60mm, and the electric field virtual value is all greater than 4.02 * 10
5V/m; Axis centered by the outer conductor central axis, radius are in the cylindrical region of 100mm, and the electric field virtual value is all greater than 3.21 * 10
5V/m.Other resonant frequency place Electric Field Distribution are similar, and electric field value is slightly different.
With dielectric constant be 3.6, to be placed on inner wire 2 tip radius be 30mm, high in the cylindrical region of 10mm to the sample of loss angle tangent 0.01, research has the situation of carrying.In like manner, regulate the length L that inner wire 2 enters outer conductor 1
1The length L that enters outer conductor 1 with feed coaxial 3 can realize the continuous variation of 500MHz～1000MHz broad frequency range internal reaction chamber resonant frequency.At this moment, Electric Field Distribution is more concentrated, and value slightly reduces.
Embodiment 2: as shown in Figure 1 and Figure 2, on the basis of embodiment 1, the end that above-mentioned feed coaxial inner conductor 41 enters outer conductor 1 connects the terminal hemisphere 413. of feed of a semi-spherical shape
Embodiment 3: such as Fig. 1, Fig. 3 and shown in Figure 4, on the basis of embodiment 1, introduce a diameter less than the barrel-shaped pallet 5 of inner wire 2, its bottom is stretched out three fixedly small columns 51 downwards, agree with fixingly with three interior fluted column apertures 22 on inner wire 2 tops, the bottom of interior fluted column aperture 22 is tapered.
Embodiment 4: such as Fig. 1, shown in Figure 5, on the basis of embodiment 1, introduce the suitable barrel-shaped pallet 5 of a diameter and inner wire 2, its bottom has an interior fluted column 52, and interior fluted column 52 coincide fixing with inner wire 2 tops.
Embodiment 5: such as Fig. 1, shown in Figure 6, on the basis of embodiment 1, introduce the suitable barrel-shaped pallet 5 of a diameter and inner wire 2, its bottom has an interior fluted column 52, and interior fluted column 52 madial walls have knuckle screw thread and inner wire 2 top screw threads agree with fixing.
Claims (5)
1. closed frequency-tunable type micro-wave reaction chamber that shakes comprises outer conductor (1), inner wire (2), closing cap (3) and feed coaxial (4); It is characterized in that: outer conductor (1) is a cylindrical metal cavity, and its center, bottom has a band internal thread bottom outlet (11); Inner wire (2) is for being with externally threaded cylinder, and the screw-internal thread fit of inner wire (2) by self external screw thread (21) and outer conductor (1) bottom outlet (11) electrically contacts outer conductor (1) and inner wire (2) maintenance and be convenient to adjust inner wire (2) and enter length in the outer conductor (1); Closing cap (3) cooperates with the internal thread (12) at outer conductor (1) top by self external screw thread makes outer conductor (1) and closing cap (3) keep electrically contacting; Be connected with handle (31) on the closing cap (3), be convenient to turn closing cap (3); Feed coaxial (4) is made of feed coaxial inner conductor (41), feed coaxial outer conductor (42) and filled media between the two (43); The end of feed coaxial inner conductor (41) has a coaxial embedding mouth (411), feed coaxial outer conductor (42) end portion to have joint screw thread (421), and coaxial embedding (411) is convenient to feed coaxial (4) with joint screw thread (421) and is linked to each other with external input port; The front end of feed coaxial inner conductor (41) is feed disk (412) or feed hemisphere (413); Closing cap (3) center has a tapped power feed hole (32), and the screw-internal thread fit in the external screw thread (422) of feed coaxial (4) by feed coaxial outer conductor (42) front end and closing cap (3) apex drive hole (32) enters length in the outer conductor (1) so that closing cap (3) and feed coaxial outer conductor (42) keep electrically contacting and be convenient to adjust feed coaxial (4).
2. the closed frequency-tunable according to claim 1 type micro-wave reaction chamber that shakes is characterized in that, the described closed frequency-tunable type micro-wave reaction chamber that shakes also comprises a pallet (5); Described pallet (5) is fixed in inner wire (2) top.
3. the closed frequency-tunable according to claim 2 type micro-wave reaction chamber that shakes, it is characterized in that, the bottom of described pallet (5) has three fixed cylinder (51), and three fixed cylinder (51) are agreed with fixing with inner wire (2) corresponding three the interior fluted columns in top (22) mutually.
4. the closed frequency-tunable according to claim 2 type micro-wave reaction chamber that shakes is characterized in that, the bottom of pallet (5) has an interior fluted column (52), and interior fluted column (52) agrees with fixing with inner wire (2) top.
5. the closed frequency-tunable according to claim 2 type micro-wave reaction chamber that shakes is characterized in that, the bottom of pallet (5) has an interior fluted column (52), and interior fluted column (52) agrees with fixing with inner wire (2) top by screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220297926 CN202725161U (en) | 2012-06-25 | 2012-06-25 | Closed tunable-frequency resonant type microwave reaction chamber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220297926 CN202725161U (en) | 2012-06-25 | 2012-06-25 | Closed tunable-frequency resonant type microwave reaction chamber |
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| Publication Number | Publication Date |
|---|---|
| CN202725161U true CN202725161U (en) | 2013-02-13 |
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|---|---|---|---|
| CN 201220297926 Expired - Lifetime CN202725161U (en) | 2012-06-25 | 2012-06-25 | Closed tunable-frequency resonant type microwave reaction chamber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744026A (en) * | 2012-06-25 | 2012-10-24 | 电子科技大学 | Closed frequency-adjustable resonant microwave reaction chamber |
-
2012
- 2012-06-25 CN CN 201220297926 patent/CN202725161U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102744026A (en) * | 2012-06-25 | 2012-10-24 | 电子科技大学 | Closed frequency-adjustable resonant microwave reaction chamber |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20131211 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20131211 |
|
| RGAV | Abandon patent right to avoid regrant |