CN102513171B - Rotary evaporator capable of carrying out measuring - Google Patents
Rotary evaporator capable of carrying out measuring Download PDFInfo
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- CN102513171B CN102513171B CN201110429254.1A CN201110429254A CN102513171B CN 102513171 B CN102513171 B CN 102513171B CN 201110429254 A CN201110429254 A CN 201110429254A CN 102513171 B CN102513171 B CN 102513171B
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- measuring
- wireway
- evaporative flask
- sensing element
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- 238000001514 detection method Methods 0.000 claims abstract description 17
- 230000001413 cellular effect Effects 0.000 claims description 2
- 238000009434 installation 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 6
- 239000013557 residual solvent Substances 0.000 abstract description 5
- 238000002474 experimental method Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000010438 heat treatment Methods 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
- 239000007795 chemical reaction product Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 239000008236 heating water Substances 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
- 238000000746 purification Methods 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
- 238000012360 testing method 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 discloses 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 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, and the distillation of the receiving liquid during especially to the concentrated and chromatographic isolation of extract, can separated and purification reaction product.The operation principle of Rotary Evaporators is vacuum distillation.By vavuum pump, make to evaporate flask in negative pressure state, control evaporative flask under the most applicable speed, constant speed rotary is to increase disengagement area, and evaporation flask is placed in water-bath heated at constant temperature, the solution heating diffusive evaporation under negative pressure in rotary flask.After the solution evaporation of evaporative flask, become steam, then the transmission by wireway condenses to rapidly in condenser pipe, and when the liquid evaporation in evaporative flask arrives certain volume, experiment stops.
During experiment, concentrated volume surplus is generally less than 5ml or 10ml, so that follow-up constant volume use, general constant volume is to 5ml or 10ml, and this just requires concentrated rear remaining volume to be less than 5ml or to be less than 10ml.To the required precision of this Rotary Evaporators, be not very high like this, as long as control last surplus, be less than 5ml or 10ml.
The existing vaporising device in laboratory, does not mostly have the function of measuring.When whether lab assistant observation experiment has reached 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 and to see always, in case evaporate to dryness again.
Because mostly will being placed on when the evaporation, the vaporising device in existing laboratory in water bath, carrys out heating water bath, therefore lab assistant need will be taken out observation by evaporative flask every a period of time in heating process in water bath, come qualitative analysis whether to be evaporated to the scale of appointment, cannot accurately hold the time on the one hand, also cannot realize on the other hand the tolerance of mechanization.Therefore need a kind of Rotary Evaporators with metric function, reduce experimenter's burden.
There is following shortcoming in existing vaporising device:
1, cannot realize quantitative measurement accurately;
2, cannot realize automatic control;
Summary of the invention
The object of the invention is the defect existing for prior art, provide the measuring technique of the elastic sensing element that a kind of utilization contains resistance strain gage effectively to overcome above-mentioned deficiency, thereby realize a kind of Rotary Evaporators that can measure solution surplus.
The present invention realizes in the following ways: a kind of measurable Rotary Evaporators, comprise: water-bath, evaporative flask, wireway and condenser pipe, heat evaporative flask at the place, below that described water-bath is positioned at described evaporative flask, described wireway left end is communicated with condenser pipe rotationally, described evaporative flask is communicated with the right-hand member of described wireway, also comprise detection module, described detection module comprises measuring unit, CPU, memory cell and result treatment unit, described measuring unit for measure described evaporative flask interior residual solvent information and convert measuring-signal to and send described CPU to, described memory cell prestores the information of residual solvent and the database of corresponding measuring-signal, whether described CPU is called described database and is determined and to described result treatment unit, transmit control signal, described result treatment unit responds according to described control signal.Described measuring unit also comprises elastic sensing element cylindraceous, and described elastic sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, for testing bottleneck, the stress of described elastic sensing element is determined to the information of residual solvent in evaporative flask.Described elastic sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, and described elastic sensing element, evaporative flask and wireway reach hermetic seal.Described elastic sensing element comprises resistance strain gage.Described measuring unit also includes electric bridge, and described electric bridge is comprised of fixed resistance and described resistance strain gage, and a pair of linea angulata of described electric bridge and power supply are electrically connected, and another cornerwise output forms measuring-signal and sends described CPU to.Described measuring unit, CPU and result treatment cellular installation are on described wireway.Described result treatment unit is alarm unit.Also comprise power supply, described power acquisition is given described measuring unit and CPU by powered battery, is also installed on described wireway.
The present invention is a kind of measurable Rotary Evaporators, mainly to utilize the annular resilient sensing element that comprises resistance strain gage in measuring unit in the situation that be subject to evaporative flask and the extruding of wireway deforms, thereby generation strain signal, then by contrast signal by comparison, whether reach the surplus of solution.There is certain relational expression in stressed size and its distortion of annular resilient sensing element, in the process in Rotary Evaporators work, annular resilient sensing element, evaporative flask and wireway are simultaneously in rotation, so annular resilient sensing element is subject to the extruding force of evaporative flask bore and wireway and the weight positive correlation of evaporative flask and interior solution thereof.So, can obtain by measuring the strain value of annular resilient element internal foil gauge the weight of solution in evaporative flask, thereby determine the surplus of solution in evaporative flask, reach the object of controlling evaporation process.
The present invention has following beneficial effect compared with prior art:
1, can monitor experiment, control accurately the carrying out of experiment;
2, instrumentation is simple, convenient;
3, the accuracy of instrument is high
Accompanying drawing explanation
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 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 output voltage;
21 is water-bath, and 22 is evaporative flask, and 23 is 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 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 annular resilient sensing element, and measuring unit 11 is connected with CPU 12.Measuring unit 11 passes to CPU 12 by 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 of measuring unit 11 transmissions, then determine whether to result treatment unit 14, transmit control signal.Power supply 15 is measuring unit 11 and CPU 13 power supplies.In an embodiment, measuring unit 11 adopts straingauge and bridge structure, and CPU 12 and memory cell 13 adopt single-chip microcomputer, 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 detection module.As shown in the figure, four brachium pontis are comprised of resistance R 1, R2, R3, R4 its connected mode, and U0 is for 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 is worked, it is foil gauge that electric bridge only has R4 brachium pontis, and electric bridge is comprised of the first resistance, the second resistance, the 3rd resistance and described resistance strain gage, and resistance becomes R+ △ R, and all the other each arms are still fixed resistance value R, and substitution above formula has:
What adopt due to measuring unit 11 is that resistance strain gage is measured the extruding force between evaporative flask bottleneck and wireway, and resistance strain gage, in annular resilient sensing element, can be one or more.So the resistance variations that resistance strain gage can be produced because of deformation by above-mentioned bridge circuit is converted into the variation of voltage signal, thus the surplus of solution in reflection evaporative flask.
In the present embodiment, the design principle of measuring unit is: establishing volume is V
0the quality of liquid be m
n, its corresponding density is ρ
n, establishing the adaptability to changes that annular resilient sensing element is subject to is F
n, the quality of evaporative flask is m
a.When 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.The present embodiment is to be desired V in the surplus of setting solution
0time, be to utilize the in-built V of evaporative flask
0solution rotating but in unvaporized situation, measures adaptability to changes and is how many, then the corresponding adaptability to changes of the combination of each solution and evaporative flask is demarcated, then it is programmed, and forms a database.Single-chip microcomputer carrys out in setting data storehouse the fiducial value of strain signal when certain solution and the evaporative flask by program.
In actual experiment, first chosen in advance evaporative flask used and the corresponding strain signal value of solution that will be evaporated to V0, when rotary evaporation, resistance strain gage sends to measuring unit 11 by strain signal, measuring unit 11 changes into voltage signal by resistance value, after amplifying, sends to single-chip microcomputer, single-chip microcomputer is compared with the comparison signal of pre-deposit data, when solution is evaporated to the surplus V of appointment
0time, single-chip microcomputer sends control signal to 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, in 23 annular resilient sensing elements, comprise resistance strain gage, belong to a part for detection module 24, detection module adopts powered battery.Wireway 25 one end are connected with condenser pipe 27, and one end connects evaporative flask 22, and motor 26 drives wireway 25 to rotate, thereby drives evaporative flask 22 in 21 li of rotations of water-bath, and the interior liquid of evaporative flask 22 is rotated to evaporation.Detection module 24 is arranged on 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, evaporative flask 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, central authorities process and the single-chip microcomputer of data storage to having in detection module 24 to make annular resilient sensing element 23 produce deformation signal, single-chip microcomputer is by processing, relatively detect and whether reach desired value this signal, along with the minimizing of solution in evaporative flask, extruding force diminishes, and finally reaches desired signal value, single-chip microcomputer transmits control signal to alarm unit, and circuit is reported to the police.
The present invention has carried out special description to disclosed a kind of measurable Rotary Evaporators, but above-mentioned be not to be schematically determinate, those skilled in the art, not departing from the modification of doing in the scope of the invention, belong to the scope of protection of the invention.
Claims (7)
1. a measurable Rotary Evaporators, comprise: water-bath, evaporative flask, wireway and condenser pipe, heat evaporative flask at the place, below that described water-bath is positioned at described evaporative flask, described wireway left end is communicated with condenser pipe rotationally, described evaporative flask is communicated with the right-hand member of described wireway, it is characterized in that, also comprise detection module, described detection module comprises measuring unit, CPU, memory cell and result treatment unit, described measuring unit comprises annular resilient sensing element, described annular resilient sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, for measuring bottleneck, the stress of described annular resilient sensing element is determined to the surplus V of solution in evaporative flask
0and convert measuring-signal to and send described CPU to, described memory cell prestores the surplus V of solution
0with the database of corresponding measuring-signal, whether described CPU is called described database and is determined and to described result treatment unit, transmit control signal, described result treatment unit responds according to described control signal.
2. measurable Rotary Evaporators according to claim 1, is characterized in that: described annular resilient sensing element is close to the join wireway outer wall of end of bottleneck with evaporative flask, and described annular resilient sensing element, evaporative flask and wireway reach hermetic seal.
3. measurable Rotary Evaporators according to claim 1, is characterized in that: described annular resilient sensing element comprises resistance strain gage.
4. measurable Rotary Evaporators according to claim 3, it is characterized in that: described measuring unit also includes electric bridge, described electric bridge is comprised of fixed resistance and described resistance strain gage, the a pair of linea angulata of described electric bridge and power supply are electrically connected, and another cornerwise output forms measuring-signal and sends described CPU to.
5. measurable Rotary Evaporators according to claim 1, is characterized in that: described measuring unit, CPU and result treatment cellular installation are on described wireway.
6. measurable Rotary Evaporators according to claim 1, is characterized in that: described result treatment unit is alarm unit.
7. measurable Rotary Evaporators according to claim 1, is characterized in that: also comprise power supply, described power acquisition is given described measuring unit and CPU by powered battery, is installed on described 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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| CN102513171A CN102513171A (en) | 2012-06-27 |
| CN102513171B true CN102513171B (en) | 2014-04-30 |
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| CN201110429254.1A Expired - Fee Related CN102513171B (en) | 2011-12-20 | 2011-12-20 | Rotary evaporator capable of carrying out measuring |
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Families Citing this family (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 |
| CN108709760B (en) * | 2018-06-05 | 2020-06-30 | 重庆市计量质量检测研究院 | Method for detecting performance of rotary evaporator instrument |
Citations (6)
| 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 |
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10108242C1 (en) * | 2001-02-21 | 2002-08-08 | Hans Georg Genser | Rotary evaporator with a pendulum system with a shifted pivot point |
-
2011
- 2011-12-20 CN CN201110429254.1A patent/CN102513171B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| 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 |
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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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