CN210303720U

CN210303720U - High-precision double-tube acid-base universal burette

Info

Publication number: CN210303720U
Application number: CN201920528356.0U
Authority: CN
Inventors: 马占龙; 韩蓉; 宋捷; 张亮; 马志岗; 刘姿辉; 徐睿
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2020-04-14
Anticipated expiration: 2029-04-18

Abstract

The utility model discloses a double-barrelled acid-base general buret of high accuracy relates to chemistry experiment instrument technical field. The utility model comprises an outer scale tube body, an inner scale tube body and a polytetrafluoroethylene cock, wherein the inner scale tube body with small diameter is arranged in the outer scale tube body; the outer wall of the inner scale tube body is provided with three brackets which are in smooth contact with the inner wall of the outer scale tube body; the lower end of the inner scale tube body is connected with a piston which is provided with a through hole and has a straight bottom surface; the piston has certain friction with the inner wall of the outer scale tube body, and the inner scale tube body cannot automatically slide downwards without the action of external force; the upper end of the inner scale tube body is provided with three resistance sheets and an inner tube cap with an inner tube cap through hole. The utility model discloses an inside and outside two scale body designs, can read out the percentile of buret reagent volume accurately, through long circle through-hole cock and the design that the aperture is trending little, the pipe wall is trending thin aciculus, effectively improves the controllability of emitting the reagent flow to the buret, has solved traditional buret survey data inaccuracy scheduling problem.

Description

High-precision double-tube acid-base universal burette

Technical Field

The utility model belongs to the technical field of chemistry experiment instrument, especially, relate to a double-barrelled acid-base general buret of high accuracy.

Background

Burettes are common laboratory instruments used in biological and chemical experiments and can be used for discharging and measuring the dosage and volume of reagents required by chemical reactions, so that the accuracy of reagent volume measurement directly influences the experimental results.

At present, the traditional burette used in a laboratory is divided into a basic burette and an acid burette, the volumes of the two burettes are generally 25mL and 50mL, the minimum scale value of the volumes is generally 0.1mL, only the tenth part of the volume of a reagent can be read during reading, and the percentile needs to be estimated and read, so the reading accuracy is not high. And the body internal diameter of traditional buret is great, and the scale change is not obvious when the reagent of buret is driped out by a small amount, leads to having great error when the reading. The cock through hole of the traditional acid burette is generally circular, and when the cock with the through hole rotates, the rotation angle and the change quantity of the opening and closing area of the through hole are unevenly changed, so the cock with the through hole is not beneficial to controlling the flow of the reagent, and meanwhile, the cock of the traditional acid burette is generally made of glass, so the acid burette cannot be filled with the alkaline reagent; the traditional basic burette has a rubber material structure, so the basic burette cannot be filled with an acid reagent. The tip aperture of the tip of the traditional burette is large, the aperture of the tip part of the tip is thick, the wall thickness of the burette causes large adhesive force between the liquid drop and the tip of the tip, so that the liquid drop volume of the reagent is large, the volume of the liquid drop dripped out of the tip is about 0.05ml under the ordinary condition, namely about 20 drops are 1ml, and the experiment requiring high precision easily causes large errors.

In summary, the following problems and drawbacks exist with the conventional burette for experiments: firstly, the reading is not accurate, and the volume percentile of the reagent needs to be estimated and read; secondly, the flow of the discharged reagent is not easy to control; thirdly, the volume of the liquid drop of the discharged reagent is larger; fourthly, the acid burette or the alkali burette cannot be used universally.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a double-barrelled general buret of acid-base of high accuracy, design through inside and outside two scale bodys, can read out the percentage position of buret reagent volume accurately, through the design of long circle through-hole and polytetrafluoroethylene cock, can improve the controllability of emitting the reagent flow to the buret, and can realize the general purpose of buret acid-base, through the design of aciculiform point mouth, can reduce the liquid drop volume of reagent, solve the problem of the data inaccuracy etc. of traditional buret survey.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a high-precision double-tube acid-base universal burette, which comprises an outer scale tube body, an inner scale tube body and a polytetrafluoroethylene cock.

An inner scale pipe body with a small pipe diameter is arranged in the outer scale pipe body; the outer wall of the inner scale tube body is provided with three brackets which are in smooth contact with the inner wall of the outer scale tube body; the lower end of the inner scale tube body is connected with a piston which is provided with a through hole and has a straight bottom surface; the piston and the inner wall of the outer scale tube body have certain friction force which is slightly larger than the gravity of the inner scale tube body, and the inner scale tube body cannot automatically slide downwards without the action of external force; the upper end of the inner scale tube body is provided with a stop sheet and an inner tube cap with an inner tube cap through hole; a polytetrafluoroethylene cock is inserted into the position of the outer scale pipe body for controlling the reagent flow; the lower end part of the outer scale tube body is provided with a needle-shaped tip.

Further, the through hole of the polytetrafluoroethylene plug is an oblong through hole.

Furthermore, the needle-shaped tip nozzle is a needle-shaped tip nozzle with a gradually smaller aperture towards the tip direction and a gradually thinner pipe wall, and a protective sleeve is arranged on the periphery side of the needle-shaped tip nozzle.

The utility model discloses following beneficial effect has:

the utility model can accurately read the percentage position of the reagent volume of the burette through the design of the inner and outer double-scale pipe bodies, thereby effectively improving the reading accuracy of the burette; by the design of the oblong through hole and the polytetrafluoroethylene cock, the control capacity of the flow of the reagent discharged from the burette is effectively improved, and the purpose of acid-base universality is realized; through the design of the needle-shaped tip, the volume of the liquid drop of the reagent is reduced, and the accuracy of a chemical experiment is improved.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the overall structure of a high-precision double-tube acid-base universal burette of the present invention;

FIG. 2 is a partial external view of a high-precision double-tube acid-base universal burette of the present invention;

FIG. 3 is a schematic view of a partial structure of a high-precision double-tube acid-base universal burette of the present invention;

FIG. 4 is a schematic structural view of an inner pipe cap of a high-precision double-pipe acid-base universal burette of the present invention;

FIG. 5 is a double-tube transverse cutting view of a high-precision double-tube acid-base universal burette of the present invention;

FIG. 6 is a cross sectional view of a needle-shaped tip of a high-precision double-tube acid-base universal burette of the present invention;

in the drawings, the components represented by the respective reference numerals are listed below:

1-outer scale tube body, 2-inner scale tube body, 3-bracket, 4-piston, 5-through hole, 6-inner tube cap through hole, 7-inner tube cap, 8-resistance sheet, 9-oblong through hole, 10-needle tip, 11-protective sleeve and 12-polytetrafluoroethylene cock.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, the utility model relates to a high-precision double-tube acid-base universal burette, which comprises an outer scale tube body 1, an inner scale tube body 2 and a polytetrafluoroethylene cock 12; an inner scale pipe body 2 with small pipe diameter is arranged in the outer scale pipe body 1; the outer wall of the inner scale tube body 2 is provided with three brackets 3, and the three brackets 3 are smoothly contacted with the inner wall of the outer scale tube body 1; the lower end of the inner scale tube body 2 is connected with a piston 4 which is provided with a through hole 5 and has a straight bottom surface; the piston 4 and the inner wall of the outer scale tube body 1 have certain friction force, the friction force is slightly larger than the gravity of the inner scale tube body, and the inner scale tube body cannot automatically slide downwards without the action of external force; the upper end of the inner scale tube body 2 is provided with a stop sheet 8 and an inner tube cap 7 with an inner tube cap through hole 6; a polytetrafluoroethylene cock 12 with a through hole in an oblong shape 9 is inserted in the position of the outer scale pipe body 1 for controlling the reagent flow; the lower end part of the outer scale tube body 1 is provided with a needle-shaped sharp mouth 10 with the aperture gradually decreasing towards the tip direction of the sharp mouth and the tube wall gradually thinning; the periphery of the needle-shaped tip 10 is provided with a protective sleeve 11.

As shown in fig. 2-6, in order to improve the accuracy of the measured data of the burette, an auxiliary measurement reading structure is additionally arranged inside the outer graduated tube body 1 of the burette, namely, an inner graduated tube body 2 with the diameter smaller than that of the outer graduated tube body 1 is provided, the inner graduated tube body 2 is also provided with a volume scale value, the volume of the inner graduated tube body is larger than 1m, the minimum volume scale value is 0.01ml or other values, and the cross-sectional area of the inner cavity of the inner graduated tube body is 1/5 or 1/10 or other proportions of the cross-sectional area of the inner cavity of the outer graduated tube body 1; when reading is needed, the inner scale pipe body 2 is pushed down to the position of the outer scale pipe body 1 with an accurate scale value, a certain amount of reagent is extruded into the inner scale pipe body 2, when the reagent enters the inner scale pipe body 2 from the outer scale pipe body 1 through the piston through hole 5, the percentile of the volume of the reagent can be conveniently and accurately read, and the reading of the volume of the reagent is the sum of the reading of the outer scale pipe body 1 at the lower bottom surface of the piston 4 and the reading of the lowest position of the concave liquid surface of the reagent in the inner scale pipe body 2; in order to avoid the shaking condition of the inner scale tube body 2, the inner scale tube body 2 is stabilized by the three brackets 3, and meanwhile, in order to avoid the problem that the inner scale tube body 2 is excessively pushed into the outer scale tube body 1 and is inconvenient to take out, the three resistance pieces 8 are arranged to prevent the inner scale tube body 2 from being completely pushed into the outer scale tube body 1; aiming at the problem that the flow of the discharged reagent is not easy to control, the circular through hole of the cock is set to be the oblong through hole 9, and the polytetrafluoroethylene cock 12 is slowly rotated when the burette is used, so that the flow of the discharged reagent can be uniformly controlled, and the control capability of the reagent flow is improved; in order to improve the experimental efficiency, for experiments in which the amount of the reagent can be predetermined to a certain extent by chemical equations and the like, and the flow rate of the discharged reagent does not affect the experimental result, the speed of the flow rate of the discharged reagent can be increased by closing the through hole 6 of the inner pipe cap and slowly pressing the inner pipe cap 7 downwards, and the pressing is stopped before the amount of the discharged reagent reaches the predetermined amount of the reagent; in order to solve the problem that the volume of the liquid drop of the discharged reagent is larger, the tip of the burette is set to be a needle-shaped tip 10 with the aperture gradually decreasing towards the tip direction of the tip and the thin tube wall gradually decreasing, so that the adhesive force between the tip of the tip and the liquid drop is reduced, the purpose of reducing the volume of the liquid drop is achieved, and a protective sleeve 11 is additionally arranged on the needle-shaped tip 10 so as to protect the tip of the needle-shaped tip 10; the cock is made of acid-resistant and alkali-resistant polytetrafluoroethylene material so as to achieve the purpose of acid and alkali universality.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a general buret of double-barrelled acid-base of high accuracy, includes outer scale body (1), interior scale body (2), polytetrafluoroethylene cock (12), its characterized in that:

an inner scale pipe body (2) with a small pipe diameter is arranged in the outer scale pipe body (1); the outer wall of the inner scale tube body (2) is provided with three brackets (3), and the three brackets (3) are in smooth contact with the inner wall of the outer scale tube body (1); the lower end of the inner scale tube body (2) is connected with a piston (4) which is provided with a through hole (5) and has a straight bottom surface; the piston (4) is in frictional contact with the inner wall of the outer scale tube body (1); the upper end of the inner scale tube body (2) is provided with a resistance sheet (8); an inner pipe cap (7) provided with an inner pipe cap through hole (6) is arranged at the upper end of the inner scale pipe body (2); a polytetrafluoroethylene cock (12) is inserted into the position of the outer scale pipe body (1) for controlling the flow of the reagent; the lower end part of the outer scale tube body (1) is provided with a needle-shaped tip (10).

2. A high precision double tube acid-base universal burette as claimed in claim 1, wherein the through hole of the teflon tap (12) is an oblong through hole (9).

3. A high-precision double-tube acid-base universal burette as claimed in claim 1, wherein the needle-shaped tip (10) is a needle-shaped tip (10) with a decreasing aperture diameter towards the tip of the tip and a decreasing tube wall, and a protective sleeve (11) is arranged on the outer periphery of the needle-shaped tip (10).