CN102513171A - Rotary evaporator capable of carrying out measuring - Google Patents
Rotary evaporator capable of carrying out measuring Download PDFInfo
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- CN102513171A CN102513171A CN2011104292541A CN201110429254A CN102513171A CN 102513171 A CN102513171 A CN 102513171A CN 2011104292541 A CN2011104292541 A CN 2011104292541A CN 201110429254 A CN201110429254 A CN 201110429254A CN 102513171 A CN102513171 A CN 102513171A
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- measuring
- wireway
- sensing element
- rotary evaporators
- evaporative flask
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- 238000001514 detection method Methods 0.000 claims abstract description 17
- 239000013557 residual solvent Substances 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims description 2
- 238000001704 evaporation Methods 0.000 abstract description 11
- 230000008020 evaporation Effects 0.000 abstract description 11
- 238000012545 processing Methods 0.000 abstract description 7
- 239000011888 foil Substances 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000012141 concentrate Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000002390 rotary evaporation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000007445 Chromatographic isolation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005292 vacuum distillation Methods 0.000 description 1
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- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention introduces a rotary evaporator. The rotary evaporator comprises a water-bath kettle, an evaporation flask, a gas-guide tube and a condenser tube; the left end of the gas-guide tube is rotatably communicated with the condenser tube, and the evaporation flask is communicated with the right end of the gas-guide tube; the rotary evaporator further comprises a detection module which comprises a measuring unit, a central processing unit, a memory cell and a result processing unit, wherein, the measuring unit is used for measuring information about a residual solvent in the evaporation flask, converts the information into a measuring signal and transmits the measuring signal to the central processing unit, the memory cell stores a database of information about the residual solvent and corresponding measuring signals in advance, the central processing unit calls the database and determines whether to send a control signal to the result processing unit, and the result processing unit responds according to the control signal. According to the invention, the purpose of measuring the amount of a residual solution in the evaporation flask is finally realized by measuring deformation of a foil gauge.
Description
Technical field
The invention belongs to the experiment equipment field, relate to a kind of Rotary Evaporators.
Background technology
Rotary Evaporators is mainly used in a large amount of effumability solvents of continuous still under reduced pressure, especially to extract concentrate with chromatographic isolation the time the distillation of reception liquid, can separate and purifying reflection product.The operation principle of Rotary Evaporators is a vacuum distillation.Make the evaporation flask be in negative pressure state through vavuum pump, the control evaporative flask is under the most suitable speed, and the constant speed rotation is to increase disengagement area, and the evaporation flask places the water-bath heated at constant temperature, the solution heating diffusive evaporation under negative pressure in the rotary flask.Become steam after the solution evaporation of evaporative flask, the transmission through wireway condenses to rapidly in the condenser pipe then, and when the liquid in the evaporative flask was evaporated to certain volume, experiment stopped.
During experiment, concentrated volume surplus generally is less than 5ml or 10ml, so that follow-up constant volume usefulness, general constant volume is to 5ml or 10ml, and this just requires to concentrate afterwards that remaining volume is less than 5ml or less than 10ml.Required precision to this Rotary Evaporators is not very high like this, as long as the last surplus of control is less than 5ml or 10ml.
The existing vaporising device in laboratory does not mostly have the function of measuring.The lab assistant observation experiment whether reached during the volume of the solution that will evaporate, need with the naked eye measure.Because last surplus is very little, this will ask lab assistant to keep aside always and see, in case evaporate to dryness again.
Because mostly will being placed on, existing breadboard vaporising device comes the water-bath heating in the water bath when evaporation; Therefore lab assistant needs in heating process, will evaporative flask be taken out observation in water bath at a distance from a period of time; Come qualitative analysis whether to be evaporated to the scale of appointment; Can't accurately hold the time on the one hand, also can't realize the tolerance of mechanization on the other hand.Therefore need a kind of Rotary Evaporators, reduce experimenter's burden with metric function.
There is following shortcoming in existing vaporising device:
1, can't realize quantitative measurement accurately;
2, can't realize automatic control;
Summary of the invention
The objective of the invention is defective, provide the measuring technique that a kind of utilization contains the elastic sensing element of resistance strain gage to come effectively to overcome above-mentioned deficiency, thereby realize a kind of Rotary Evaporators that can measure the solution surplus to the prior art existence.
The present invention adopts following mode to realize: a kind of measurable Rotary Evaporators; Comprise: water-bath, evaporative flask, wireway and condenser pipe; Heat evaporative flask at the place, below that said water-bath is positioned at said evaporative flask; Said wireway left end is communicated with condenser pipe rotationally; Said evaporative flask is communicated with the right-hand member of said wireway, also comprises detection module, and said detection module comprises measuring unit, CPU, memory cell and result treatment unit; Said measuring unit be used to measure said steam bottle interior residual solvent information and convert measuring-signal to and send said CPU to; Said memory cell prestores the information of residual solvent and the database of corresponding measuring-signal, and said CPU calls said database and whether decision transmits control signal for said result treatment unit, and said result treatment unit responds according to said control signal.Said measuring unit also comprises elastic sensing element cylindraceous; And said elastic sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, is used to test bottleneck is confirmed residual solvent in the steam bottle to the stress of said elastic sensing element information.Said elastic sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, and said elastic sensing element, steam bottle and wireway reach hermetic seal.Said elastic sensing element comprises resistance strain gage.Said measuring unit also includes electric bridge, and said electric bridge is made up of fixed resistance and said resistance strain gage, and a diagonal of said electric bridge and power supply electrically connect, and another cornerwise output forms measuring-signal and sends said CPU to.Said measuring unit, CPU and result treatment unit are installed on the said wireway.Said result treatment unit is an alarm unit.Also comprise power supply, said power supply adopts powered battery to give said measuring unit and CPU, also is installed on the said wireway.
The present invention is a kind of measurable Rotary Evaporators; Mainly be to utilize the annular resilient sensing element that comprises resistance strain gage in the measuring unit under the situation of the extruding that receives evaporative flask and wireway, to deform; Thereby generation strain signal; Through contrast signal by comparison, whether reach the surplus of solution then.There are certain relational expression in stressed size and its distortion of annular resilient sensing element; Because in the process of Rotary Evaporators work; Annular resilient sensing element, evaporative flask and wireway are simultaneously in rotation, so the annular resilient sensing element receives the extruding force of evaporative flask bore and wireway and the weight positive correlation of evaporative flask and interior solution thereof.So, can obtain the weight of solution in the evaporative flask through the strain value of measuring ring-type flexible member internal strain sheet, thereby confirm the surplus of solution in the evaporative flask, reach the purpose of control evaporation process.
The present invention has following beneficial effect compared with prior art:
1, can monitor the carrying out of control experiment accurately to experiment;
2, instrumentation is simple, convenient;
3, the accuracy of instrument is high
Description of drawings
Fig. 1 is the schematic block circuit diagram of detection module of the present invention;
Fig. 2 is the electric bridge connection layout of measuring unit in the detection module of the present invention;
Fig. 3 is the structure chart of one embodiment of the present of invention;
Wherein:
11 is measuring unit, and 12 is CPU, and 13 is memory cell, 14 result treatment unit, and 15 is power supply;
R1, R2, R3, R4 are resistance, and U0 is for supplying bridge voltage, and U is an output voltage;
21 is water-bath, and 22 is evaporative flask, and 23 is the annular resilient sensing element, and 24 is detection module, and 25 is wireway, and 26 is motor, and 27 is condenser pipe.
The specific embodiment
The schematic block circuit diagram of detection module of the present invention is as shown in Figure 1.Its circuit diagram comprises measuring unit 11, CPU 12, memory cell 13, result treatment unit 14 and power supply 15.Measuring unit 11 comprises the annular resilient sensing element, and measuring unit 11 links to each other with CPU 12.Measuring unit 11 passes to CPU 12 with measuring-signal; CPU 12 is called the database of surplus solution information that memory cell 13 prestores and corresponding measuring-signal; And compare with the measuring-signal that measuring unit 11 sends, whether decision transmits control signal for result treatment unit 14 again.Power supply 14 is measuring unit 12 and CPU 13 power supplies.In an embodiment, measuring unit 11 adopts straingauge and bridge structure, and CPU 12 adopts single-chip microcomputer with memory cell 13, and result treatment unit 14 adopts alarm, and power supply 15 adopts powered battery.
Fig. 2 is the electric bridge connection layout of measuring unit in the detection module.Its connected mode is as shown in the figure, and four brachium pontis are made up of resistance R 1, R2, R3, R4, and U0 supplies bridge voltage.
Output voltage is:
When R1 * R3=R2 * R4, output voltage U is zero, and electric bridge is in poised state.If change R4 into foil gauge, foil gauge is out of shape with stress deformation, causes the variation of foil gauge resistance R 4, and balance is destroyed, and output voltage U changes.When arm was worked, it was foil gauge that electric bridge has only the R4 brachium pontis, and promptly electric bridge is made up of first resistance, second resistance, the 3rd resistance and said resistance strain gage, and resistance becomes R+ △ R, and all the other each arms still are fixed resistance value R, and the substitution following formula has:
Because what measuring unit 11 adopted is that resistance strain gage is measured the extruding force between evaporative flask bottleneck and the wireway, resistance strain gage can be one or more in the annular resilient sensing element.So can the resistance variations that resistance strain gage produces because of deformation be converted into the variation of voltage signal through above-mentioned bridge circuit, thereby reflect the surplus of solution in the evaporative flask.
The design principle of measuring unit is in the present embodiment: establishing volume is V
0The quality of liquid be m
n, its corresponding density is ρ
n, establishing the adaptability to changes that the annular resilient sensing element receives is F
n, the quality of evaporative flask is m
aWhen work, there is certain relation in the adaptability to changes of liquid and evaporative flask quality sum and cyclic spring sensing element 23.
That is:
F
n∝(m
a+m
n)g
So:
F
n∝(m
a+V
0ρ
n)g
So the quality sum of the solution of each density and evaporative flask and the proportional relation of adaptability to changes.Present embodiment is to be desired V in the surplus of setting solution
0The time, be to utilize dress V in the evaporative flask
0Solution rotating but under the unvaporized situation is measured adaptability to changes what is, then the pairing adaptability to changes of the combination of each solution and evaporative flask is demarcated, and again to its programming, forms a database.Single-chip microcomputer comes in the setting data storehouse fiducial value of strain signal when certain solution and the evaporative flask through program.
In actual experiment, used evaporative flask of first chosen in advance and institute will be evaporated to V
0The pairing strain signal value of solution; When rotary evaporation, resistance strain gage sends to measuring unit 11 with strain signal, and measuring unit 11 changes into voltage signal with resistance value; After amplifying; Send to single-chip microcomputer, single-chip microcomputer is compared with the comparison signal of the data that prestore, and is evaporated to the surplus V of appointment when solution
0The time, single-chip microcomputer sends control signal and gives alarm, and alarm is reported to the police.
As shown in Figure 3, be the structure chart of one embodiment of the present of invention.The structure of this embodiment comprises water-bath 21, evaporative flask 22, annular resilient sensing element 23, detection module 24, wireway 25, motor 26 and condenser pipe 27.Wherein, comprise resistance strain gage in the 23 annular resilient sensing elements, belong to the part of detection module 24, detection module adopts powered battery.Wireway 25 1 ends link to each other with condenser pipe 27, and an end connects evaporative flask 22, and motor 26 drives wireway 25 and rotates, thereby drive evaporative flask 22 in 21 li rotations of water-bath, and liquid in the evaporative flask 22 is rotated evaporation.Detection module 24 is installed on the wireway 25, adopts powered battery.Wherein the annular resilient sensing element of detection module 24 is close to join wireway 25 outer walls of end of bottleneck with evaporative flask 22, and annular resilient sensing element 23, steam bottle 22 and wireway 25 reach hermetic seal.Detection module 24 comprises bridge structure, single-chip microcomputer and the alarm of resistance strain gage.When rotary evaporation, evaporative flask and wireway produce an extruding force to annular resilient sensing element 23, make annular resilient sensing element 23 produce deformation signal and give the single-chip microcomputer that has central authorities' processing and storage in the detection module 24; Single-chip microcomputer is through handling, relatively detect whether reach desired value this signal; Along with the minimizing of solution in the evaporative flask, extruding force diminishes, and finally reaches desired signal value; Single-chip microcomputer transmits control signal to alarm unit, makes circuit report to the police.
The present invention has carried out special description to disclosed a kind of measurable Rotary Evaporators, but above-mentioned be schematically not to be determinate, those skilled in the art belong to the scope of the present invention's protection in the modification that does not depart from the scope of the invention to be done.
Claims (8)
1. measurable Rotary Evaporators; Comprise: water-bath, evaporative flask, wireway and condenser pipe; Heat evaporative flask at the place, below that said water-bath is positioned at said evaporative flask; Said wireway left end is communicated with condenser pipe rotationally, and said evaporative flask is communicated with the right-hand member of said wireway, it is characterized in that; Also comprise detection module; Said detection module comprises measuring unit, CPU, memory cell and result treatment unit, said measuring unit be used to measure said steam bottle interior residual solvent information and convert measuring-signal to and send said CPU to, said memory cell prestores the information of residual solvent and the database of corresponding measuring-signal; Said CPU calls said database and whether decision transmits control signal for said result treatment unit, and said result treatment unit responds according to said control signal.
2. measurable Rotary Evaporators according to claim 1; It is characterized in that: said measuring unit also comprises elastic sensing element cylindraceous; And said elastic sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, is used to test bottleneck is confirmed residual solvent in the steam bottle to the stress of said elastic sensing element information.
3. measurable Rotary Evaporators according to claim 1 is characterized in that: said elastic sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, and said elastic sensing element, steam bottle and wireway reach hermetic seal.
4. measurable Rotary Evaporators according to claim 1 is characterized in that: said elastic sensing element comprises resistance strain gage.
5. measurable Rotary Evaporators according to claim 3; It is characterized in that: said measuring unit also includes electric bridge; Said electric bridge is made up of fixed resistance and said resistance strain gage; One diagonal of said electric bridge and power supply electrically connect, and another cornerwise output forms measuring-signal and sends said CPU to.
6. measurable Rotary Evaporators according to claim 1 is characterized in that: said measuring unit, CPU and result treatment unit are installed on the said wireway.
7. measurable Rotary Evaporators according to claim 1 is characterized in that: said result treatment unit is an alarm unit.
8. measurable Rotary Evaporators according to claim 1 is characterized in that: also comprise power supply, said power supply adopts powered battery to give said measuring unit and CPU, is installed on the said wireway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110429254.1A CN102513171B (en) | 2011-12-20 | 2011-12-20 | Rotary evaporator capable of carrying out measuring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110429254.1A CN102513171B (en) | 2011-12-20 | 2011-12-20 | Rotary evaporator capable of carrying out measuring |
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| Publication Number | Publication Date |
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| CN102513171A true CN102513171A (en) | 2012-06-27 |
| CN102513171B CN102513171B (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110429254.1A Expired - Fee Related CN102513171B (en) | 2011-12-20 | 2011-12-20 | Rotary evaporator capable of carrying out measuring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103721776A (en) * | 2014-01-16 | 2014-04-16 | 深圳市华测检测技术股份有限公司 | Strain automatic quantitative liquid dropping device |
| CN105149025A (en) * | 2015-09-16 | 2015-12-16 | 常州进出口工业及消费品安全检测中心 | Rotary evaporation bottle having quantitative function |
| CN108709760A (en) * | 2018-06-05 | 2018-10-26 | 重庆市计量质量检测研究院 | Method for the detection of Rotary Evaporators instrument performance |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2700894A1 (en) * | 1977-01-11 | 1978-07-13 | Buechi Lab Tech | Rotatory evaporator for delicately handling liquids - has monitors ensuring optimal working with minimal consumption of cooling water |
| JPS5973001A (en) * | 1982-10-16 | 1984-04-25 | Yamato Scient Co Ltd | Control system of rotary evaporator |
| US4759825A (en) * | 1985-07-25 | 1988-07-26 | Bela Medvey | Rotary evaporator |
| US5759356A (en) * | 1993-10-14 | 1998-06-02 | Buchi Labortechnik Ag | Evaporator flask for a rotary evaporator |
| US20020148718A1 (en) * | 2001-02-21 | 2002-10-17 | Genser Hans Georg | Rotary evaporator with a pendulum system with an offset fulcrum |
| CN201454558U (en) * | 2009-06-12 | 2010-05-12 | 湖北中烟工业有限责任公司 | Anti-splash rotary evaporator |
| CN202666881U (en) * | 2011-12-20 | 2013-01-16 | 深圳市华测检测技术股份有限公司 | Rotary evaporimeter capable of measuring |
-
2011
- 2011-12-20 CN CN201110429254.1A patent/CN102513171B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2700894A1 (en) * | 1977-01-11 | 1978-07-13 | Buechi Lab Tech | Rotatory evaporator for delicately handling liquids - has monitors ensuring optimal working with minimal consumption of cooling water |
| JPS5973001A (en) * | 1982-10-16 | 1984-04-25 | Yamato Scient Co Ltd | Control system of rotary evaporator |
| US4759825A (en) * | 1985-07-25 | 1988-07-26 | Bela Medvey | Rotary evaporator |
| US5759356A (en) * | 1993-10-14 | 1998-06-02 | Buchi Labortechnik Ag | Evaporator flask for a rotary evaporator |
| US20020148718A1 (en) * | 2001-02-21 | 2002-10-17 | Genser Hans Georg | Rotary evaporator with a pendulum system with an offset fulcrum |
| CN201454558U (en) * | 2009-06-12 | 2010-05-12 | 湖北中烟工业有限责任公司 | Anti-splash rotary evaporator |
| CN202666881U (en) * | 2011-12-20 | 2013-01-16 | 深圳市华测检测技术股份有限公司 | Rotary evaporimeter capable of measuring |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103721776A (en) * | 2014-01-16 | 2014-04-16 | 深圳市华测检测技术股份有限公司 | Strain automatic quantitative liquid dropping device |
| CN105149025A (en) * | 2015-09-16 | 2015-12-16 | 常州进出口工业及消费品安全检测中心 | Rotary evaporation bottle having quantitative function |
| CN108709760A (en) * | 2018-06-05 | 2018-10-26 | 重庆市计量质量检测研究院 | Method for the detection of Rotary Evaporators instrument performance |
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| Publication number | Publication date |
|---|---|
| CN102513171B (en) | 2014-04-30 |
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Address after: 518057 Guangdong, Shenzhen Province, Baoan District District, Wei Wei Industrial Park, building C, 70 Patentee after: CENTRE TESTING INTERNATIONAL GROUP CO., LTD. Address before: 518057 Guangdong, Shenzhen Province, Baoan District District, Wei Wei Industrial Park, building C, 70 Patentee before: Shenzhen Centre Testing Technology Co., Ltd. |
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Application publication date: 20120627 Assignee: Wuhan Hua Testing Technology Co., Ltd. Assignor: CENTRE TESTING INTERNATIONAL GROUP CO., LTD. Contract record no.: 2015420000159 Denomination of invention: Measurable rotary evaporator Granted publication date: 20140430 License type: Exclusive License Record date: 20150914 |
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