CN202666881U - Rotary evaporimeter capable of measuring - Google Patents

Abstract

The utility model relates to an evaporimeter which comprises a water bath kettle, an evaporation bottle, a gas-guide tube and a condenser pipe. The left end of the gas-guide tube is communicated with the condenser pipe in a rotary mode, and the right end of the gas-guide tube is communicated with the evaporation bottle. The evaporimeter further comprises a detecting module which comprises a measuring unit, a central processing unit, a storing unit and a result processing unit. The measuring unit is used for measuring the information of residual solvent inside the evaporation bottle and transforming the information into a measuring signal to be transmitted to the central processing unit. The storing unit pre-stores a data base of the information of the residual solvent and the corresponding measuring signals, the central processing unit invokes the data base and determines whether a control signal is transmitted to the result processing unit or not, and the result processing unit responds according to the control signal. The rotary evaporimeter capable of measuring eventually achieves the purpose that the residual amount of solution inside the evaporation bottle is measured.

Description

Measurable Rotary Evaporators

Technical field

The utility model belongs to the experiment equipment field, relates 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 separate and purifying reflection product.The operation principle of Rotary Evaporators is vacuum distillation.Make the evaporation flask be in negative pressure state by vavuum pump, the control evaporative flask is under the most suitable speed, and constant speed rotary 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, then the transmission by wireway condenses to rapidly in the condenser pipe, and when the liquid evaporation in the evaporative flask arrived 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 concentrated afterwards remaining volume to be less than 5ml or less than 10ml.Be not very high to the required precision of this Rotary Evaporators 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.When whether the 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 always and see, in case evaporate to dryness again.

Because mostly will being placed on, the vaporising device in existing laboratory comes heating water bath in the water bath when evaporation, therefore lab assistant needs evaporative flask to be taken out observation in water bath every a period of time in heating process, 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 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, can't realize accurately quantitative measurement;

2, can't realize automatic control.

The utility model content

The purpose of this utility model is the defective that exists for prior art, provides the measuring technique of the elastic sensing element that a kind of utilization contains resistance strain gage effectively to overcome above-mentioned deficiency, thereby realizes a kind of Rotary Evaporators that can measure the solution surplus.

The utility model is realized 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 be used for measuring 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 transmit control signal to described result treatment unit, 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, is used for the test bottleneck is determined residual solvent in the evaporative flask to the stress of described elastic sensing element information.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 with powered battery, also is installed on the described wireway.

The utility model 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 in the situation of the extruding that is subject to evaporative flask and wireway, to deform, thereby generation strain signal, then by contrast signal by comparison, whether reach the surplus of solution.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 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 the strain value of measuring annular resilient element internal foil gauge the weight of solution in the evaporative flask, thereby determine the surplus of solution in the evaporative flask, reach the purpose of control evaporation process.

The utility model has following beneficial effect compared with prior art:

1, can monitor to experiment the carrying out of accurately control 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 the utility model detection module;

Fig. 2 is the electric bridge connection layout of measuring unit in the detection module of the present utility model;

Fig. 3 is the structure chart of an embodiment of the present utility model;

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 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 utility model 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, determine again whether transmit control signal to result treatment unit 14.Power supply 15 is measuring unit 11 and CPU 12 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 the detection module.Its connected mode as shown in the figure, four brachium pontis are comprised of resistance R 1, R2, R3, R4, U0 is for bridge voltage.

Output voltage is:

$U=\frac{R1\×R3-R2\×R4}{(R1+R2)(R3+R4)}\×U0$

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 only has the R4 brachium pontis, and namely 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 still are fixed resistance value R, and the substitution following formula has:

$\mathrm{\ΔU}=\frac{\mathrm{\ΔR}}{4\×R}\×U0$

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 the resistance variations that resistance strain gage produces because of deformation can be converted into the variation of voltage signal by 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 is subject to 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 the in-built V of evaporative flask ₀Solution rotating but in the unvaporized situation is measured adaptability to changes what is, then the corresponding 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 by program.

In actual experiment, the used evaporative flask of first chosen in advance and will be evaporated to V ₀The corresponding strain signal value of solution, when rotary evaporation, resistance strain gage sends to measuring unit 11 with strain signal, 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 pre-deposit data, is evaporated to the surplus V of appointment when solution ₀The time, 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 an embodiment of the present utility model.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 evaporative flask 22 interior liquid are 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, 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 the detection module 24 so that annular resilient sensing element 23 produces deformation signal, single-chip microcomputer is by processing, 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, so that circuit is reported to the police.

The utility model has carried out special description to disclosed a kind of measurable Rotary Evaporators; but above-mentioned is schematically not to be determinate; the modification that those skilled in the art do within not departing from the utility model scope all belongs to the scope that the utility model is protected.

Claims (8)

1. 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 be used for measuring 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 transmit control signal to described result treatment unit, described result treatment unit responds according to described control signal.

2. measurable Rotary Evaporators according to claim 1, it is characterized in that: 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, is used for the test bottleneck is determined residual solvent in the evaporative flask to the stress of described elastic sensing element information.

3. measurable Rotary Evaporators according to claim 2 is characterized in that: 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.

4. measurable Rotary Evaporators according to claim 2, it is characterized in that: described elastic sensing element comprises resistance strain gage.

5. 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.

6. measurable Rotary Evaporators according to claim 1, it is characterized in that: described measuring unit, CPU and result treatment cellular installation are on described wireway.

7. measurable Rotary Evaporators according to claim 1, it is characterized in that: described result treatment unit is alarm unit.

8. 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 with powered battery, is installed on the described wireway.

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