CN2294775Y

CN2294775Y - Automatic general titration device

Info

Publication number: CN2294775Y
Application number: CN 96232675
Authority: CN
Inventors: 陈集
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 1996-02-05
Filing date: 1996-02-05
Publication date: 1998-10-21
Anticipated expiration: 2006-02-05

Abstract

The utility model relates to a chemical analysis automatic general titration device, which is composed of a magnetic stirrer, a liquid-stored bottle, a cover arm, a graduation pipe, a spinning press valve, a titration head, a pressure ball, and a reading-aid device. The utility model can add the liquid and adjust zero rapidly, exactly and automatically; the utility model stirs the tested liquid automatically, and controls the titration speed conveniently and flexibly. The utility model is generally used in the acidity and alkalescency condition, and has no problem of leakage or blockage. The instrument is convenient, flexible and handy to operate; the reading is rapid and exact. The instrument can increase efficiency and accuracy of the titration analysis greatly. The instrument structure is compact and reasonable, the select material is proper, the performance is super, the cost is low; the instrument is easy to generalize and use.

Description

Automatic general titration kit

The utility model belongs to the titrimetry instrument that uses in chemical analysis and the chemical experiment.

At present, in titrimetry, still mainly continue to use acid buret and the base buret of just inventing before more than 100 year.Although it is cheap, but because of shortcomings such as it have liquid feeding zeroing trouble, leakage or obstruction easily, operation control is dumb, analysis speed slow, operator's labour intensity is big, therefore, some new titrimetry devices have been released in recent years both at home and abroad successively, " dibit titrator " as China's Shashi production, " the digital autotitrator " that Germany produces, " automatic zero burette " that U.S. Cole Pa Mo company produces, " liquid feeding zeroing titration kit automatically ".China's patent " Storage pipette ", " a kind of acid buret ", " a kind of buret " etc.In above-mentioned these titrimetry instruments, though have simple in structure, easy to operate, insufficiency; Though the advanced technology that has, automaticity height, high, the maintenance difficult of price; China's patent " general titration kit " (patent No. 91202009.1) is though improve to some extent at the aspects such as mode, reading and liquid feeding zeroing of control rate of titration, but it is slower also to exist rate of reading, when titrant more after a little while, extruding reservoir liquid feeding is difficult, stability of instrument is not good enough, always must be with hand conical flask with shortcomings such as mixing test solutions during titration.

The purpose of this utility model is to make a kind of convenience, quick, accurate, cheap, well behaved automatic general titration kit.It is on the basis of patent " general titration kit ", has done bigger improvement, makes its performance more perfect, to satisfy consumer's use needs.

The automatic general titration kit that the utility model is invented is to be made of base (1), reservoir (2), the ball of calming the anger (3), lid arm (5), liquid-feeding tube (7), upper and lower retainer plate (8,6), scale pipe cap (9), reading aid (11), graded tube (12), soft bomb tube (13), screwdown valve (14), titrating head (15), magnetic stirring apparatus (16,18).Its major technique feature is: lid arm (5) is to be combined as an integral body by bottle cap, titration arm and scale base; Be connected with the ball (3) of calming the anger on the arm at lid.Following retainer plate is fixed graded tube and liquid-feeding tube; Last retainer plate and scale pipe cap make liquid-feeding tube and liquid feeding mouth fixed-site; The position of screwdown valve is in the side of titration arm, and graded tube connects with titrating head mutually by soft bomb tube.The ball (3) of calming the anger is made up of rubber ball (24), outgassing nonreturn valve (25,26,27) and vent valve (28), and an air inlet aperture is arranged in the bottom of rubber ball, matches with thumb and air inlet aperture, can play the effect of breather check valve.Scale pipe cap (9) can closely be enclosed within the upper end of graded tube, and its top center has a vertical aperture, makes the fixed-site of the liquid feeding mouth (10) that passes aperture, and its sidepiece has an aperture, makes in the graded tube to communicate with atmosphere.Card has a reading aid (11) on graded tube, reading aid is the plastic sheet of a crooked compacting, utilize the elasticity of himself to be stuck on the graded tube (12), can arrest its handle with hand makes it go up random upper and lower slip at graded tube (12), its first half is a black for white, Lower Half, and it can make meniscus seem more clear.The titrating head (15) that is connected with soft bomb tube is to draw the tiny dropper of the port of export that forms by the polyethylene from high pressure process pipe, because its hydrophobic characteristic, each dropping liquid drop volume of outflow only is about 1/2nd of a glass titrating head, can make titer more accurate.

This automatic general titration kit has the following advantages: liquid feeding zeroing automatically promptly, and stir test solution automatically, control rate of titration, no leakage and blocking problem easily and flexibly; Can be general under acidity or alkali condition, reading is accurate rapidly.Use this instrument can improve titrimetric efficient and analytical accuracy; Easy and simple to handle, flexible; Compact conformation is reasonable, cost is lower, is easy to promote the use of.

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the schematic diagram of the utility model " automatic general titration kit ".

Fig. 2 is the schematic diagram of screwdown valve (14).

Fig. 3 is the schematic diagram of reading aid (11).

Fig. 4 is the top plan view of Fig. 3.

Fig. 5 is the schematic diagram of ball (3) of calming the anger.

In the drawings, 1. base 2. reservoirs 3. retainer plate 9. scale pipe caps 10. liquid feeding mouths 11. reading aids 12. graded tubes 13. soft bomb tube 14. screwdown valves 15. titrating heads 16. stirrers 17. power switches 18. magnetic agitation motor 19. attaching plugs 20. valve bodies 21. knobs 22. spinning bars 23. bearing plates 24. rubber balls 25. plastic inner pipes 26. thin rubber case 27. plastic outer sleeves 28. vent valves on 6. times retainer plates of ball 4. breather pipes 5. lid arms, 7. liquid-feeding tubes 8. of calming the anger.

In Fig. 1, base (1) is made by high density polyethylene (HDPE), and magnetic agitation motor (18) is fixed on its inside, the bottle seat is arranged at the top of base, can put into reservoir and conical flask, reservoir is the glass reagent bottle with standard screw socket, and volume is 500 milliliters or 1000 milliliters.Lid arm (5) is made by high density polyethylene (HDPE), and it is bottle cap, titration arm and scale base three's combination, has screw thread to cooperate with the reservoir mouth in the bottle cap, screws bottle cap and can seal bottleneck.The titration arm is the support arm of titrating head (15) and screwdown valve (14), and glass graded tube (12) can vertically insert in the scale base easily.The liquid feeding mouth (10) of liquid-feeding tube (7) upper end passes the centre bore of scale pipe cap (9), mention or push the height that liquid feeding mouth (10) can be adjusted liquid feeding zeroing back liquid level position, the last aperture in addition of scale pipe cap (9) makes in the graded tube and communicates with atmosphere, can utilize siphon principle to make the liquid level self-zeroing after liquid feeding surpasses zero graduation.

In Fig. 2, screwdown valve (14) is by valve body (20), knob (21), spinning bar (22), bearing plate (23), and the soft bomb tube (13) that passes therethrough is formed.

In Fig. 3, reading aid (11) is the plastic sheet that a crooked compacting forms, and utilizes the elasticity of himself to be stuck on the graded tube (12); The handle of arresting its right-hand member with finger can make it with the surperficial upper and lower slip that is intended to graded tube (12); The first half of reading aid is for white, Lower Half is black, during reading it is slid into the liquid meniscus place in the graded tube, but clear and accurate read the volume number.Fig. 4 is the reading aid vertical view.

In Fig. 5, the ball of calming the anger (3) is made up of rubber ball (24), outgassing nonreturn valve (25,26,27) and vent valve (28).Outgassing nonreturn valve is made of plastic inner pipe (25), thin rubber case (26) and plastic outer sleeve (27).

This automatic general titration kit operation instruction: clean instrument earlier, titrating solution is packed in the reservoir (2), will cover bottle cap screwing on the arm (5) again on bottleneck.Vent valve (28) on the occlusion pressure balloon (3), block air inlet aperture, extruding rubber ball (24) with thumb, the bottle internal gas pressure increases, titrating solution is pressed in the graded tube (12) along liquid-feeding tube (7), liquid feeding mouth (10), after treating that liquid level surpasses zero graduation, the vent valve (28) of outwarding winding immediately makes bottle internal gas pressure equate with atmospheric pressure, the interior excess liquid of graded tube (12) turns back in the reservoir, can finish the liquid feeding zeroing rapidly.

Before the titration, the tested test solution of certain volume is packed in the conical flask, put into stirrer (16).Connect power supply, magnetic agitation motor (19) begins to rotate, and drives stirrer and does not stop rotation in test solution, test solution is mixed.During titration, titrating head (15) is aimed at the taper bottleneck, rotate the knob (21) on the screwdown valve (14), the titrating solution in the graded tube is flowed out through titrating head (15) in soft bomb tube (13).When near terminal point, screw screwdown valve slightly, titrating solution just can dropwise flow out.When reaching home, screw screwdown valve immediately, titrating solution stops to flow out.Reading aid (11) is slid into the interior meniscus place of graded tube (12), just can read the volume number that titrating solution consumes exactly.

Claims

1. automatic general titration kit that is used for chemical analysis and chemical experiment, be to be made of base (1), reservoir (2), the ball of calming the anger (3), lid arm (5), liquid-feeding tube (7), upper and lower retainer plate (8,6), scale pipe cap (9), reading aid (11), graded tube (12), soft bomb tube (13), screwdown valve (14), titrating head (15), magnetic stirring apparatus (16,18), it is characterized in that: the lid arm is to be combined as an integral body by bottle cap, titration arm and scale base; Covering the ball of be connected with-calming the anger on the arm; Following retainer plate is fixed graded tube and liquid-feeding tube; Last retainer plate and scale pipe cap make liquid-feeding tube and liquid feeding mouth fixed-site; The position of screwdown valve is in the side of titration arm; Graded tube connects with titrating head mutually by soft bomb tube.

2. titration kit according to claim 1, it is characterized in that: the ball of calming the anger (3) is made up of rubber ball (24), outgassing nonreturn valve (25,26,27) and vent valve (28), one air inlet aperture is arranged at the bottom of rubber ball, match with thumb and air inlet aperture, can play the effect of breather check valve.

3. titration kit according to claim 1, it is characterized in that: scale pipe cap (9) can closely be enclosed within the upper end of graded tube, and its top center has a vertical aperture, makes the fixed-site of the liquid feeding mouth (10) that passes aperture, its sidepiece has aperture, makes in the graded tube to communicate with atmosphere.

4. titration kit according to claim 1, it is characterized in that: reading aid (11) is the plastic sheet of a crooked compacting, utilize the elasticity of himself to be stuck on the graded tube (12), can arrest its handle with hand makes it go up random upper and lower slip at graded tube (12), its first half is a white, Lower Half is a black, can make meniscus seem more clear.

5. titration kit according to claim 1, it is characterized in that: titrating head (15) is to draw the tiny dropper of the port of export that forms by the polyethylene from high pressure process pipe, because its hydrophobic characteristic, each the dropping liquid drop volume that flows out only is about 1/2nd of a glass titrating head, can make titer more accurate.