CN201020363Y - Dropping head structure for burette or transfer pipette - Google Patents
Dropping head structure for burette or transfer pipette Download PDFInfo
- Publication number
- CN201020363Y CN201020363Y CNU2007200103380U CN200720010338U CN201020363Y CN 201020363 Y CN201020363 Y CN 201020363Y CN U2007200103380 U CNU2007200103380 U CN U2007200103380U CN 200720010338 U CN200720010338 U CN 200720010338U CN 201020363 Y CN201020363 Y CN 201020363Y
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- Prior art keywords
- pipette
- buret
- burette
- emitter structure
- wedge
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Abstract
The utility model relates to a common burette or pipette dripper for analytic chemistry, in particular to a structure of a burette or pipette dripper, which is of minor arc wedge structure at the top, so as to effectively improve the precision of burette or pipette precision and avoid misoperation. The utility model is particularly applicable for transfer operation of little liquid.
Description
Technical field
The utility model relates to buret and the pipette that often uses in the chemical laboratory, the emitter structure of specifically a kind of buret or pipette.
Background technology
In chemical laboratory, often need use buret and pipette.Conventional buret is divided into two kinds of acid and alkali formulas, and capacity is 50ml, and the capacity of microburet can be 10ml usually, even 1ml.During near terminal point, may need half drop of liquid in titration.General way is: partly form spherically at solution at water dropper, when also not dripping fully, by obedient wall, make it enter into following solution.The about 0.05ml of the volume of this half solution, and have only veteran operator just can effectively control.For conventional titration operation, this error can be thought in systematic error, but for microtitration, its error will can not be ignored.Therefore design a kind of device or structure that can reduce this error, for reducing the human error that experimental implementation is brought, it is very meaningful to improve experimental precision.
The pipette that adopt in the laboratory is according to the volume difference that pipettes liquid, can be divided into different a variety of.The above pipette of 10ml mostly is the shape of big tripe greatly, and is generally straight type structure less than the pipette of 10ml, and liquid is inhaled in the glass tube of hollow, and the scale on glass tube surface is used to determine the volume that pipettes.Same with buret, pipette last that liquid emits from pipe, very a spot of a part of liquid holdup is often arranged at tube head, need it be transferred in the following solution by means such as obedient walls.Although adopting the identical operations step in common operation tests, can partly avoid accidental error, but because the rectification personnel of quantitative instrument and practical operation personnel's operation have certain difference, and each operating personnel also has the custom of oneself, therefore in the transplanting of method, and will produce artificial error in the report of data.
The utility model content
The purpose of this utility model is to provide the emitter structure of a kind of buret or pipette, makes to obtain approximate same result when all operating personnel use, and improves the analysis precision of assay laboratory.
For achieving the above object, the technical solution adopted in the utility model is:
The emitter structure of a kind of buret or pipette, it has the wedge structure of minor arc face for the top.
Described wedge structure has an inclined-plane, and it is provided with the groove that is connected with the mesopore of buret or pipette, and the cross section of groove is circle or dihedral; The angle of its wedge structure tip portion can be 10-85 °, is preferably 45-60 °.
Can be arranged with a taper or a frustum protective sleeve that is complementary with its size in the wedge structure outside; The front portion of protective sleeve for the tip of water dropper be complementary taper or frustum oblique angle structure, the rear portion be and buret or the fixing cartridge type part of pipette that cavity is protected in the tip formation of taper or frustum oblique angle structure and water dropper.
The utility model adopts a kind of sharp structure with circular groove, can effectively improve the precision of buret or pipette, avoids operate miss, especially is suitable for the transfer operation of micro liquid, can improve the analysis precision in the analytical chemistry.
Description of drawings
Fig. 1 is the existing conventional pipette or the emitter structure schematic diagram of buret;
The emitter structure that Fig. 2 designs for the utility model;
Fig. 3 is the enlarged drawing at emitter structure tip in the diagram;
Fig. 4 is the utility model protective sleeve structural representation.
The specific embodiment
Embodiment 1
As shown in Figure 1, it is the general pipette or the emitter structure of buret.Notice that the front end of its wedge structure is bigger horizontal.Liquid flows out from the mesopore 2 of glass water dropper 1, forms circular drop 3 at the mouth place.Get at obedient wall shift under the situation of half drop of liquid, according to operating personnel's experience, each people is to drop control time difference, and the size differences of droplet size is bigger.Overlong time may cause the integral drip drop all to pipette, and causes positive error, and deficiency of time, otherwise pipette less than, or still not forming complete drop is promptly pipetted, and secondary error occurs.
As shown in Figure 2, it is an emitter structure of the present utility model, it has the wedge structure of minor arc face for the top, and the residing tangent plane 4 of its minor arc string (inclined-plane of wedge structure) is provided with the groove 5 that is connected with the mesopore 2 (being internal cavity) of buret or pipette, and the cross section of groove is circular; The angle of its wedge structure tip portion is 45-60 °.
Liquid flows out from mesopore 2, and flows to most advanced and sophisticated along groove 5.Following titration bottle or walls of beaker are pressed close in the tip, can reach the purpose that accurately pipettes drop.
The utility model is used for chemistry can be processed on original device with the emitter structure part of buret or pipette, also can directly adopt mould to finish when producing.The oblique part that cuts in top with existing buret or pipette forms the wedge structure with minor arc face, passes through mutually at it then and offers circle or the dihedral groove 5 that is connected with mesopore 2 on the face.
No matter be buret or pipette, water dropper is the most flimsy part.Because the emitter structure of this utility model is sharper, damage for fear of it, also designed supporting protective sleeve assembly, as shown in Figure 3, be arranged with a taper or a frustum protective sleeve that is complementary with its size in the wedge structure outside;
The material of protective sleeve can be glass, quartz glass, stainless steel or the plastics with sufficient intensity.Protective sleeve is as independent assembly, and it combines with original device, can adopt the form of directly being inserted in, and also can adopt clamp type structure to fix, and guarantees that both effectively contact.
The taper oblique angle structure 6 of protective sleeve mates with the tip of water dropper, and cartridge type part 7 plays fixing effect, if adopt the flexible plastic material, both better cooperate size, do not need other extentions.If adopt materials such as stainless steel, must in cartridge type part 7, add clamp type structure to fix; 8 is cavity, and the tip of water dropper is played a protective role.
Application example:
Adopt the 10ml buret of two kinds of different structures to test.A kind of is general commercially available buret; Another kind is the buret of processing voluntarily according to the utility model, and both are all corrected before experiment.
The making of water dropper: the water dropper of general, commercially available buret is partly worn into the wedge shape of 45, and further grinds the circular groove of mating with the water dropper internal diameter thereon.Complete.
Each titration 5ml.Fill then, repeat 10 times.Table a kind has provided the contrast of experimental result.
Table 1 adopts the structure contrast of the utility model new construction buret and traditional structure buret
| The test sequence number | 1 | 2 | 3 | 4 |
| The utility model buret traditional structure buret | 50.10 50.23 | 50.07 50.31 | 49.97 50.22 | 50.04 49.81 |
Claims (7)
1. the emitter structure of buret or pipette, it is characterized in that: it has the wedge structure of minor arc face for the top.
2. according to the described emitter structure of claim 1, it is characterized in that: described wedge structure has an inclined-plane, and it is provided with the groove (5) that is connected with the mesopore (2) of buret or pipette.
3. according to the described emitter structure of claim 2, it is characterized in that: the cross section of described groove is circle or dihedral.
4. according to the described emitter structure of claim 1, it is characterized in that: the angle of its wedge structure tip portion is 10-85 °.
5. according to the described emitter structure of claim 1, it is characterized in that: the angle of described wedge structure tip portion is preferably 45-60 °.
6. according to the described emitter structure of claim 1, it is characterized in that: be arranged with a taper or a frustum protective sleeve that is complementary with its size in the wedge structure outside.
7. according to the described emitter structure of claim 6; it is characterized in that: the front portion of protective sleeve for the tip of water dropper be complementary taper or frustum oblique angle structure (6); the rear portion is and buret or the fixing cartridge type part (7) of pipette that taper or frustum oblique angle structure (6) form protection cavity (8) with the tip of water dropper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200103380U CN201020363Y (en) | 2007-01-26 | 2007-01-26 | Dropping head structure for burette or transfer pipette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200103380U CN201020363Y (en) | 2007-01-26 | 2007-01-26 | Dropping head structure for burette or transfer pipette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201020363Y true CN201020363Y (en) | 2008-02-13 |
Family
ID=39087769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200103380U Expired - Fee Related CN201020363Y (en) | 2007-01-26 | 2007-01-26 | Dropping head structure for burette or transfer pipette |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201020363Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101064B (en) * | 2009-12-16 | 2012-12-26 | 中国科学院沈阳应用生态研究所 | Emitter structure of burette joint |
| CN106872642A (en) * | 2017-01-03 | 2017-06-20 | 北京雪迪龙科技股份有限公司 | A kind of micro-sampling pipe |
-
2007
- 2007-01-26 CN CNU2007200103380U patent/CN201020363Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102101064B (en) * | 2009-12-16 | 2012-12-26 | 中国科学院沈阳应用生态研究所 | Emitter structure of burette joint |
| CN106872642A (en) * | 2017-01-03 | 2017-06-20 | 北京雪迪龙科技股份有限公司 | A kind of micro-sampling pipe |
| CN106872642B (en) * | 2017-01-03 | 2020-01-17 | 北京雪迪龙科技股份有限公司 | Trace sampling tube |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080213 |