CN2068418U

CN2068418U - Batch liquid-removing apparatus for chemical test

Info

Publication number: CN2068418U
Application number: CN 89221971
Authority: CN
Inventors: 陈集
Original assignee: XINAN PETROLEUM COLLEGE
Current assignee: XINAN PETROLEUM COLLEGE
Priority date: 1989-12-21
Filing date: 1989-12-21
Publication date: 1991-01-02

Abstract

The utility model relates to a rapid batch liquid-removing apparatus for the chemical test, comprising a pumping depressor, a connecting pipe, suction pipes and a liquid suction nozzle. Two positioning disks of the piston rod in the pumping depressor and cylinder cover of a piston cylinder can together determine the moving distance of a piston to consequently control the size of the quantity of removing the liquid. The utility model can be connected with suction pipes with different sizes through a connecting pipe. After the pumping depressor is calibrated, the utility model can be directly sheathed with the liquid suction nozzle to the used in the match model and can produce pumping depressors and liquid suction nozzles with different sizes according to the requirement. The utility model is simple in structure, low in cost, convenient in operation, rapid in removing the liquid, adjustable in the quantity of the removed liquid according to the requirement and higher in precision of removing the liquid.

Description

Batch liquid-removing apparatus for chemical test

The utility model belongs to the fast quantification that uses in the chemical experiment and moves the liquid instrument.

At present, various moving in the liquid instrument at home and abroad, the complex structure, the price that have are expensive; The liquid measure of moving that has can not free adjustment change; The liquid speed of moving that has is slower again, is unfavorable for promoting the use of in research and production.And the under lab widely used tradition that combines with pipette with ear washing bulb is moved the liquid method, and is both time-consuming, extremely inconvenient again.

The purpose of this utility model be to make a kind of be suitable for chemical experiment, that can measure different volumes liquid quickly and easily, simple in structure, cheap, the quantitative pipettor that is easy to promote the use of.

This quantitative pipettor utilizes the principle work of syringe, determines the distance that piston moves by positioning disk and cover, thereby control moves liquid measure.During the extracting piston, form negative pressure, solution is inhaled in suction pipe or the imbibition nozzle.When depressing piston, form malleation, solution is forced out and moves in the receiving vessel.

Describe CONSTRUCTED SPECIFICATION of the present utility model and working condition in detail below in conjunction with accompanying drawing: accompanying drawing: the quantitative pipettor structure chart of chemical experiment.

Among the figure: 1, suction pipe, 2, tube connector, 3, piston cylinder, 4, piston, 5, fastening nut down, 6, tighten nut, 7, piston rod, 8, positioning disk down, 9, cover, 10, go up positioning disk, 11, the pressure-raising ring, 12, imbibition nozzle.Wherein the 3-11 formation is taken out depressor.

This quantitative pipettor is formed by taking out depressor (3-11), connecting piece (2), suction pipe (1) or imbibition nozzle (12) three parts.Take out the piston cylinder 3 usefulness rigid plastics casting system in the depressor, the garden tube on its top can closely cooperate with piston 4, and the screw thread mouth of upper end can screw the cover 9 of rigid plastics casting system.Piston 4 is the plastics Cylinder, and an aperture that be able to pass piston rod 7 is arranged along its axle center, and fastening nut 5,6 can be fixed on piston the lower end of piston rod.Piston rod is made by steel wire, the bar fine and closely woven screw thread of having got on the bus.The last positioning disk 10 of steel and following positioning disk 8 be can with the microgroove nut of piston rod close fit.There is an aperture that can pass piston rod at the center of cover 9, and there is a strip hole side, for regulating positioning disk 8 usefulness down.Regulate upper and lower positioning disk and can change the distance that piston moves, thereby control moves the size of liquid measure.The upper end of piston rod is cast into rigid plastics pressure-raising ring 11, during operation finger is inserted in the ring, puts pressure on can be easily, drives piston and moves up and down in piston cylinder.The lower end of taking out depressor is hollow reverse frustoconic, and an end of plastic union pipe 2 can closely overlap in the above.The other end of tube connector can connect the glass pipette 1 of all size.Taking out depressor and can directly overlap the vinyon imbibition nozzle 12 that connects different size and use after calibration.

Quantitatively pipettor course of work is as follows for this: if measure the liquid of different volumes, connect volume required suction pipe on the depressor taking out.Suction pipe is inserted in the liquid.Slowly upwards mention the pressure-raising ring again, solution enters suction pipe, stops extracting when certain scale, shifts in receiving vessel then.Take out the effect that depressor has replaced ear washing bulb this moment, but more convenient than the latter, needn't change hand and pin suction pipe and once finish.If when measuring the liquid of equal volume, to calibrate earlier and take out depressor.Connect suction pipe on the depressor taking out, regulate the position of positioning disk 10, depress the pressure-raising ring, suction pipe is inserted in the solution, slowly mention the pressure-raising ring again, solution enters suction pipe.Regulate positioning disk 8 down, make liquid level meet the requirements of scale, mention suction pipe then from solution, solution is pressed in the receiving vessel, take out depressor and be calibrated this moment.After twisting standard, take out depressor, when shifting the solution of equal volume, just needn't calibrate again, also can directly connect sucker mouth 12 and use.If precision prescribed is higher, also available measurement method calibration moves liquid measure.

Be to adapt to chemical experiment needs, quantitative pipettor can be made and move liquid measure is series of products such as 0～2 milliliter, 0～5 milliliter, 0～10 milliliter, 0～25 milliliter, 0～50 milliliter.

This quantitative pipettor can be simplified pipetting, improves and moves liquid speed, saves time.It both can cooperate the suction pipe of all size to use, and also can directly connect the plastics imbibition nozzle and use after calibration move liquid measure.Its structure is simpler than commercially available quantitative pipette (device), need before dispatching from the factory, accurately not edit yet and move liquid measure, its big I of moving liquid measure need conveniently be adjusted with the user, moving the liquid precision improves with the raising of calibration accuracy, therefore the production cost of this quantitative pipettor is low, easy to use, be easy to promote.

Embodiment 1: use 0～2 milliliter of quantitative pipettor (socket suction pipe) of making according to above-mentioned principle to carry out pipetting, behind the calibrated scale, whenever move liquid and once only took time 3～5 seconds, want tens of seconds time at least and cooperate suction pipe to move liquid with ear washing bulb.Repeatedly experiment shows that the former moves the liquid precision and is not less than the latter.

Embodiment 2: the standard series of the atomic absorption analysis of preparation magnesium.With 0～5 milliliter that makes according to above-mentioned principle quantitative pipettor (socket calibration suction pipe), adding 0,0.5,1,2,3,5 ml concns in 6 50 milliliters volumetric flask respectively is 10 μ g.ml ^-1The magnesium standard liquid, in each volumetric flask, add 1.5 milliliters with 0～2 milliliter the quantitative pipettor of having calibrated (cooperation imbibition nozzle) again, concentration is 10 μ g.ml ^-1Strontium solution.Select to scale with pure water is rare then, on atomic absorption spectrophotometer, measure, the gained calibration curve is linear good, coefficient correlation is near 1, with cooperate suction pipe to move the result of liquid with ear washing bulb similar, but operating process is easier than the latter, and the used time only is the latter's part, has accelerated dosing speed greatly.

Claims

1, a kind of quantitative pipettor that is used for chemical experiment, be to constitute by taking out depressor 3～11, tube connector 2, suction pipe 1 and imbibition nozzle 12, it is characterized in that: it is definite by the cover 9 that the upper and lower positioning disk on the piston rod 7 10,8 and piston cylinder 3 upper ends screw to take out the distance that the piston 4 in the depressor moves, aperture is arranged at the top of cover 9, and the side has for regulating the strip hole of positioning disk 8 usefulness down.

2, the depressor of taking out according to claim 1 is characterized in that it can connect the suction pipe use of different size by tube connector 2, also can the directly imbibition nozzle of socket different size use after calibration moves liquid measure.