CN110215946A - A kind of novel metal test tube device for microwave heating - Google Patents
A kind of novel metal test tube device for microwave heating Download PDFInfo
- Publication number
- CN110215946A CN110215946A CN201910456036.3A CN201910456036A CN110215946A CN 110215946 A CN110215946 A CN 110215946A CN 201910456036 A CN201910456036 A CN 201910456036A CN 110215946 A CN110215946 A CN 110215946A
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- Prior art keywords
- test tube
- metal
- heating
- microwave
- tube device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 66
- 239000002184 metal Substances 0.000 title claims abstract description 66
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 66
- 239000011888 foil Substances 0.000 claims abstract description 7
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 2
- 239000010931 gold Substances 0.000 claims 2
- 229910052737 gold Inorganic materials 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 12
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 2
- 230000008859 change Effects 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000011521 glass Substances 0.000 description 9
- 230000000630 rising effect Effects 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000005030 aluminium foil Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 241000883990 Flabellum Species 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/508—Containers for the purpose of retaining a material to be analysed, e.g. test tubes rigid containers not provided for above
- B01L3/5082—Test tubes per se
Abstract
The invention belongs to test tube engineering device technique fields, disclose a kind of novel metal test tube device for microwave heating, are provided with test tube body；Metal sleeve is enclosed on the outside of test tube body, metal sleeve is cylindrical shape, top and bottom end opening, and metal sleeve is metal foil or metal sheet.It is the configuration of the present invention is simple, cheap, it is only made of conventional test tube and sheet metal, conventional test tube can conveniently be bought by market, price is only several yuans, the commercially available metal aluminum foil of thin metal layer or tinfoil paper production, therefore, of the invention is low in cost；And heating effect is good, compared to the heating in conventional test tube, in such a way that the outer wall of conventional test tube wraps up thin metal layer, it can change electromagnetic wave propagation direction, " focusing effect " can be effectively avoided in the comparable situation of heating efficiency, to significantly improve microwave heating uniformity.
Description
Technical field
The invention belongs to test tube engineering device technique field more particularly to a kind of novel metal cuvette cartridges for microwave heating
It sets.
Background technique
Currently, the prior art commonly used in the trade is such that
Microwave heating has been widely used for food, material, change because of the advantages that heating speed is fast, high-efficient and pollution-free
Work and medicine and other fields.Liquid need to generally be heated in fields, microwaves such as microwave chemical, microwave abstracting, microwave synthesis.
Existing technology is usually to contain liquid into the conventional test tube such as glass or polytetrafluoroethylene (PTFE), and it is anti-that the test tube is then placed in microwave
It answers in device, is then turned on microwave power supply, it is heated.However, when using conventional test tube, heated liquid in heating process
It will appear significant " focusing effect ", that is, the central temperature of test tube caused to be much higher than the temperature at other positions.This will cause trying
Solution temperature is excessively high at tube hub, and corresponding treatment effect is but not achieved at other positions.In general, to improve microwave heating
Uniformity, frequently with following three kinds of methods.Method one: the placing rotary disk in microwave reactor puts the heating objects such as test tube
It is placed in turntable, then heating object is moved in microwave reactor.Although this method can be to a certain degree
Interior raising heating uniformity, but effect is undesirable, and needs to increase the devices such as additional turntable, motor, increases cost.Side
Method two: mode stirrer is placed in microwave reactor.This method is current most widely used method, but improvement
Still not ideal enough, show: heating efficiency is lower when heating low consumption liquid, and heating uniformity is poor when heating high consumption liquid,
And using needing to increase the devices such as additional stirring flabellum, motor, increase cost.Method three: it is fed using more feeds.Feedback
The increase in source causes using complexity, and significantly increases cost.
In conclusion problem of the existing technology is:
It will appear significant focusing effect in conventional test tube microwave heating process, cause the central temperature of test tube much higher than examination
The temperature for managing other positions influences the uniformity of test tube heating, to influence heating effect.There is heating to imitate for existing method
The problems such as fruit is undesirable, complicated for operation, higher cost.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of novel metal cuvette cartridges for microwave heating
It sets.
The invention is realized in this way a kind of novel metal cuvette cartridge for microwave heating is set and is provided with
Test tube body；
Metal sleeve is enclosed on the outside of test tube body.
It is the configuration of the present invention is simple, cheap, it is only made of conventional test tube and sheet metal, conventional test tube can be by market
Conveniently to buy, price is only several yuans, the commercially available metal aluminum foil of thin metal layer or tinfoil paper production, therefore,
Cost of the invention is less than 10 yuans；And heating effect is good, compared to the heating in conventional test tube, by conventional examination
The mode of the outer wall package thin metal layer of pipe, thus it is possible to vary electromagnetic wave propagation direction, situation that can be suitable in heating efficiency
Under, " focusing effect " is effectively avoided, to significantly improve microwave heating uniformity.
Further, metal sleeve is cylindrical shape, top and bottom end opening.
Metal sleeve of the invention does not wrap up the top and bottom of conventional test tube, so that microwave is from the top and bottom of test tube
Portion enters the inside of test tube.
Further, metal sleeve is metal foil or metal sheet.
In conclusion advantages of the present invention and good effect are as follows:
1. heating uniformity is good.Compared to common test tube, the present invention can effectively avoid " focusing effect " in heating process,
So as to which heating uniformity is improved 20% or so.
2. low manufacture cost.Compared to common test tube, the present invention merely adds thin metal layer structure.The thin metal layer structure
Cost it is very cheap, easily obtained from market.Therefore, cost of manufacture of the invention is suitable with common test tube.With other methods
It compares, cost is very low and easy to operate.
Detailed description of the invention
Fig. 1 is the novel metal test tube apparatus structure schematic diagram provided in an embodiment of the present invention for microwave heating；
In figure: 1, test tube body；2, metal sleeve.
Fig. 2 is Distribution of temperature rise figure after one water of embodiment provided in an embodiment of the present invention heats 100 seconds.
Fig. 3 is Distribution of temperature rise figure after two water of embodiment provided in an embodiment of the present invention heats 100 seconds.
Specific embodiment
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and cooperate attached drawing
Detailed description are as follows.
As shown in Figure 1, the novel metal test tube device provided in an embodiment of the present invention for microwave heating includes: test tube sheet
Body 1, metal sleeve 2.
Metal sleeve 2 is enclosed on the outside of test tube body 1, metal sleeve 2 is cylindrical shape, top and bottom end opening, metallic sheath
Cylinder 2 is metal foil or metal sheet.
The working principle of the invention is:
1. " focusing effect " of the conventional test tube there is in, heating uniformity is poor in microwave heating process.Big
In most microwave heating applications, due to the test tube wall thinner thickness of conventional test tube, and its relative dielectric constant will be much smaller than analysis
Diluted acid, the stronger solution of diluted alkaline isopolarity, therefore influence of the negligible conventional test tube to Electromagnetic Wave Propagation in microwave reactor.?
During microwave heating, electric field isElectromagnetic wave is from the air exposure near conventional test tube outer wall to the surface of solution, and one
Point reflection of electromagnetic wave is made the return trip empty in gas, and another part electromagnetic wave enters solution internal communication.Due to the relative dielectric constant of solution
Much larger than the relative dielectric constant of air, according to Fresnel reflections law, the refraction angle of electromagnetic wave in the solution will be substantially less that into
Firing angle, the direction of propagation will be skewed towards the central axes direction of test tube, to form " focusing effect ".This will make the temperature of immediate vicinity
Degree rising is too fast, generates biggish temperature gradient, heating uniformity is poor.
2. to overcome problem above, the present invention uses the outer wall that thin metal layer is wrapped in conventional test tube to wrap up, constitutes
One metal cylinder waveguide.At this point, electromagnetic wave can only enter inside solution from the bottom of test tube or top, prevent electromagnetic wave from examination
Tube wall enters solution and forms " focusing effect ", improves heating uniformity.
3. the metal needs that the present invention uses have good conductive characteristic, conductivity should generally meet σ >=104Ω/m,
Its material can be aluminium, copper, iron and all kinds of alloys etc..
4. the internal diameter radius r of the metal test tubes should determine according to the working frequency of microwave and the relative dielectric constant of solution
Fixed, should ensure that can at least transmit a TE mould or TM mould, physical relationship are as follows:
Wherein f is the frequency of microwave, εrFor the real part of the relative dielectric constant of solution.
5. the thickness for the thin metal layer that the present invention uses should be greater than skin depth of the microwave in used metal.
Embodiment one:
It is 4.0cm that aluminium foil, which is wrapped in internal diameter, and a height of 5.0cm, wall thickness is the outer wall of the flat-bottomed glass test tube of 0.2cm, structure
At metal test tubes device, and 20ml water is held in the apparatus.By the test tube device and its water held, it is placed in microwave reaction
The center of the glass tray of device, is heated.Using microwave heating power 100W, working frequency 2450MHz, heating
Time is 100 seconds.In the metal test tubes device shown in Distribution of temperature rise such as Fig. 2 (a) of water.Fig. 2 (b) is when removing aluminium foil, flat
The Distribution of temperature rise of aqueous solution in teat glass.From figure 2 it can be seen that conventional test tube center can go out in microwave heating
Existing " focusing effect ", can preferably avoid the problem using the present invention.Further to assess heating efficiency and heating of the invention
Uniformity, table 1 show the average temperature rising of the present invention and conventional test tubeWith COV value.Wherein, the calculation formula of COV value is as follows:
WhereinFor average temperature rising, N is the number of sampling points of water temperature, TiFor the temperature rise of ith sample point.Wherein, COV value
It is smaller, it is better to represent heating uniformity；Conversely,.
1. novel metal test tube device one of table is compared with the microwave heating situation of Conventional glass test tube
Compare average temperature rising (the i.e. heating effect it is recognized that while the water using metal test tubes device of the invention from table 1
Rate), outline is lower than the case where using conventional test tube.But heating uniformity (COV=0.568) is normal far better than using
The case where advising test tube (COV=0.818).
Embodiment two:
It is 3.0cm that aluminium foil, which is wrapped in internal diameter, and a height of 10.0cm, wall thickness is the outer wall of the flat-bottomed glass test tube of 0.2cm.Aluminium
The range of the test tube wall of foil package is test tube bottom to the part of a height of 0.015cm.By the test tube device and its hold
10mL water is placed in the center of the glass tray of microwave reactor, is heated.Using microwave heating power 150W, work
Working frequency is 2450MHz, and heating time is 100 seconds.In the metal test tubes device shown in Distribution of temperature rise such as Fig. 3 (a) of water.Fig. 3
(b) for when removing aluminium foil, the Distribution of temperature rise of the aqueous solution in flat-bottomed glass test tube.From figure 3, it can be seen that in microwave heating
When, conventional test tube center will appear " focusing effect ", can preferably avoid the problem using the present invention.This is listed in table 2
The average temperature rising of invention and conventional test tubeWith COV value, it is respectively used to characterization heating efficiency and heating uniformity, such as case one
It is described.
2. novel metal test tube device two of table is compared with the microwave heating situation of Conventional glass test tube
Compare from table 2 it is found that using metal test tubes device of the invention water average temperature rising substantially with use routine
The case where test tube, is suitable.But heating uniformity (COV=0.547) will be far better than (COV the case where using conventional test tube
=0.655).
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (6)
1. a kind of novel metal test tube device for microwave heating, which is characterized in that the novel gold for microwave heating
Category cuvette cartridge, which is set, to be provided with
Test tube body；
Metal sleeve is enclosed on the outside of test tube body.
2. being used for the novel metal test tube device of microwave heating as described in claim 1, which is characterized in that metal sleeve is circle
Tubular, top and bottom end opening.
3. being used for the novel metal test tube device of microwave heating as described in claim 1, which is characterized in that metal sleeve is gold
Belong to foil or metal sheet.
4. being used for the novel metal test tube device of microwave heating as described in claim 1, which is characterized in that described to be used for microwave
The novel metal test tube device of heating uses the outer wall that thin metal layer is wrapped in conventional test tube to wrap up, and constitutes a round metal
Column waveguide.
5. being used for the novel metal test tube device of microwave heating as described in claim 1, which is characterized in that described to be used for microwave
The internal diameter radius r of the metal test tubes of the novel metal test tube device of heating should be according to the opposite of the working frequency of microwave and solution
Dielectric constant determines, at least transmits a TE mould or TM mould, physical relationship are as follows:
Wherein f is the frequency of microwave, εrFor the real part of the relative dielectric constant of solution.
6. being used for the novel metal test tube device of microwave heating as described in claim 1, which is characterized in that described to be used for microwave
The thickness for the thin metal layer that the novel metal test tube device of heating uses should be greater than skin depth of the microwave in used metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910456036.3A CN110215946A (en) | 2019-05-29 | 2019-05-29 | A kind of novel metal test tube device for microwave heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910456036.3A CN110215946A (en) | 2019-05-29 | 2019-05-29 | A kind of novel metal test tube device for microwave heating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110215946A true CN110215946A (en) | 2019-09-10 |
Family
ID=67818371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910456036.3A Pending CN110215946A (en) | 2019-05-29 | 2019-05-29 | A kind of novel metal test tube device for microwave heating |
Country Status (1)
| Country | Link |
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| CN (1) | CN110215946A (en) |
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Application publication date: 20190910 |
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| RJ01 | Rejection of invention patent application after publication |