CN210846426U

CN210846426U - Volumetric flask capable of fixing volume and having a plurality of different volumes

Info

Publication number: CN210846426U
Application number: CN201921449363.8U
Authority: CN
Inventors: 温淑瑶
Original assignee: Beijing Normal University
Current assignee: Beijing Normal University
Priority date: 2019-09-03
Filing date: 2019-09-03
Publication date: 2020-06-26
Anticipated expiration: 2029-09-03

Abstract

The utility model relates to a chemical experiment equipment technical field especially relates to a volumetric flask, concretely relates to volumetric flask that can a plurality of different capacities of constant volume. Volumetric flask of a plurality of different capacities of constant volume, include: the bottle comprises a bottle body, a neck and a bottle mouth plug, wherein the outer surface of the neck is provided with a plurality of scale marks and corresponding capacity digital marks, one scale mark in the middle is designed for the capacity bottle, a bulge structure is arranged at a part close to the bottle mouth so that a glass rod can conveniently stretch into the bottle mouth for guiding flow, the scale marks 'measuring out' when the scale marks all indicate the volume of the measured solution, and the scale marks 'measuring in' or not when the scale marks all indicate the volume of the measured solution. The utility model improves the constant volume precision of the volumetric flask, avoids the trouble that only the reassortment can be abandoned when the solution amount exceeds the marked line during the constant volume, saves the medicine and the solvent, and improves the efficiency; when the metering-out volumetric flask is selected, the solution with accurate constant volume can be directly poured out for use, and the complexity and the error of a pipette are saved.

Description

Volumetric flask capable of fixing volume and having a plurality of different volumes

Technical Field

The utility model relates to a chemical experiment equipment technical field especially relates to a volumetric flask, concretely relates to volumetric flask that can a plurality of different capacities of constant volume.

Background

The volumetric flask is a thin neck pear-shaped flat-bottomed volumetric flask, is mostly glass materials, also has transparent plastic material, is the accurate instrument for preparing the solution of the volume concentration of accurate certain material. The volumetric flask is provided with a ground glass stopper and the neck is usually provided with a marked line, which means that the volume of the solution is exactly equal to the volume marked on the flask when the liquid level of the liquid at the indicated temperature is tangent to the marked line on the neck of the volumetric flask. The volumetric flask is marked with: temperature, volume, scale lines. The more used bottles are of a 'measuring-in' type, and two marked lines are engraved, wherein the upper line represents the measured volume. Volumetric flasks have various specifications, including 5ml, 25ml, 50ml and 100ml for small ones and 250ml, 500ml, 1000ml and 2000ml for large ones, and are mainly used for preparing standard solutions and accurate dilution solutions and preparing sample solutions by a direct method.

The existing volumetric flask can only fix the volume to a specific volume in the using process, the utilization rate is not high enough, and the precision is not high enough. The volumetric flask often uses with the pipette cooperation, and surplus solution of surplus in the volumetric flask after moving the liquid usually is abandoned, causes the waste, if contain poisonous harmful composition and need special treatment just can discharge, environmental protection not enough, also uneconomic. Solution amount often appears during the constant volume and exceeds the marked line, and only need discard, the reconfiguration, not only extravagant medicine, solvent reduce work efficiency moreover.

SUMMERY OF THE UTILITY MODEL

The utility model provides a but volumetric flask of a plurality of different capacities of constant volume has solved the problem that a volumetric flask can only specific capacity of constant volume, has avoided the waste of medicine, solvent, has improved constant volume precision and work efficiency.

In order to achieve the above object, the utility model provides a but volumetric flask of a plurality of different capacities of constant volume, include: the bottle comprises a bottle body, a neck and a bottle mouth plug, wherein the outer surface of the neck is provided with a plurality of scale lines and capacity digital marks;

one of the plurality of scale marks is used for designing the volume of the volumetric flask;

preferably, the bottle body is a flat-bottomed container;

further preferably, the bottle body is of a pear-shaped flat-bottom structure;

preferably, the neck may be an elongated tubular structure;

preferably, the part of the neck part (2) close to the bottle mouth part is provided with an expansion structure (7), so that the glass rod can conveniently extend into the neck part (2) under the condition that the inner diameter of the neck part is too small and can be guided to flow into the volumetric flask;

the volume of the part of the plurality of scale marks (4) of the neck (2) is a certain numerical value between 1mL and 20 mL;

preferably, the volume of the part of the plurality of scale marks (4) of the neck part (2) is a certain value between 2 mL and 15 mL;

more preferably, the volume of the part of the plurality of scale marks (4) of the neck part (2) is a certain value between 2 and 10 mL;

the scribed lines all indicate the measured solution volume with a "measured" mark above the scribed line;

the lines all indicate the volume of solution metered in, with or without the line being marked "metered in".

The volumetric flask capable of fixing a plurality of volumes is made of transparent glass, transparent plastic or other transparent materials which do not react with the components of the solution to be fixed.

But volumetric flask of a plurality of different capacities of constant volume compares with prior art's volumetric flask and has following advantage: (1) the neck is provided with a plurality of scale marks, so that the accurate volume of the solution can be conveniently read in the constant volume operation process, the accurate concentration of the solution can be conveniently calculated, the problem that the reconfiguration is complicated because the excessive amount cannot be determined when the solution volume exceeds the marked line of the designed volume in the constant volume process is avoided, the medicines and the solvent are saved, and the working efficiency is improved; (2) the neck is thin, so that the reading precision is improved; (3) when the scale line represents the volume of the measured solution, the solution with the uniformly shaken design volume can be directly poured out, so that the complexity of pipetting by a pipette and the error brought by the pipette are saved; (4) the bulging structure (7) arranged on the part, close to the bottle mouth, of the neck facilitates the glass rods with different thicknesses to stretch into the bulging structure for flow guiding.

Drawings

FIG. 1 is a schematic structural view of a volumetric flask according to an embodiment of the present invention;

labeled as: 1-bottle body, 2-neck, 3-bottle mouth stopper, 4-multiple scale lines, 5-capacity digital mark, 6-designed capacity of the volumetric flask, and 7-bulging structure.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

Examples

Referring to fig. 1, the volumetric flask capable of fixing a plurality of volumes with different volumes according to the embodiment includes: the bottle comprises a pear-shaped flat-bottom bottle body 1, a slender neck 2 and a bottle mouth plug 3, wherein the outer surface of the neck 2 is provided with a plurality of scale marks 4 and capacity digital marks 5;

the length of the neck part 2 is set according to the requirement, and an expansion structure 7 is preferably arranged at the part close to the bottle mouth, so that glass rods with different thicknesses can conveniently extend into the expansion structure to be guided into the bottle;

the volume of the part of the plurality of scale marks 4 of the neck part 2 is set to be a certain value between 1mL and 20mL, such as 10 mL;

the scribed lines indicate that the volume of the measured solution is marked with a 'measuring out' character (not shown in the figure);

when the scribed lines all represent the volume of the measured solution, two characters of 'measuring in' are marked above the scribed lines or no marks are marked.

The material of a but a plurality of different volumetric flasks of constant volume is transparent glass.

But volumetric flask of a plurality of different capacities of constant volume compares the following example of advantage with prior art's volumetric flask:

example 1

COD is a frequently-measured index of water quality monitoring, in the measurement of COD, 0.2500mol/L potassium dichromate solution needs to be prepared, if 100mL is required to be prepared, 1.2258g of high-grade pure potassium dichromate which is dried at 120 ℃ for 2 hours in advance needs to be weighed and dissolved in a small amount of distilled water, a glass rod is uniformly stirred and moved into a 100mL volumetric flask, the glass rod and a beaker are washed by distilled water in a washing bottle for multiple times, washing liquid is transferred into the 100mL volumetric flask, and finally distilled water is added by a dropper, because the dropping speed is too fast, the solution exceeds 100mL, in the case of the prior art, the solution can only be poured into a waste liquid recycling barrel, and the waste liquid company charges for treatment, because potassium dichromate is a distortion, carcinogen and a mutation substance and cannot be directly discharged, and the solution can only be prepared again. If use the utility model discloses a 100mL volumetric flask, many scale marks 4 partial volumes of its neck 2 are 10mL, accurate to 0.1mL, and then can read out the solution volume of preparing and be 100.10mL to calculate the concentration of potassium dichromate solution and be 0.2498mol/L, this solution brings the concentration value into 0.2498 in the calculation of COD value, and not 0.2500 can. The neck is provided with the plurality of scale marks 4, so that the accurate solution volume of 100.10mL can be conveniently read in the constant volume operation process, the accurate concentration of the solution can be conveniently calculated, the problem that the solution volume exceeds the marked line when the constant volume is realized, the problem that the solution volume can only be discarded due to the fact that the solution volume cannot be determined to exceed the marked line is solved, the medicine and the solvent are saved, the working efficiency is improved, the problem that the toxic waste liquid is complicated to store, transport and treat is avoided, and the treatment cost is saved;

example 2

Prior art's 100mL volumetric flask can only read 100.0mL, because the utility model discloses a volumetric flask neck is 1mL to the volume of many scale marks 4 parts, can read to 100.10mL, can read to 100.100mL even, the utility model discloses a volumetric flask has improved the precision of reading.

Example 3

The process of prior art survey COD value needs to move 20.00 mL's potassium dichromate solution in 250mL ground erlenmeyer flask with abluent pipette accurately and reacts, adopts the utility model discloses a 20.00mL volumetric flask, the partial volume of many scale marks 4 of its neck 2 is 1mL, and the volume between per two adjacent scale lines is 0.01mL, is accurate to 0.01mL promptly, can directly pour the even 20.00mL solution of configuration into 250mL ground erlenmeyer flask when the ruling shows the solution volume of measurationing, has saved the loaded down with trivial details of pipetting with the pipette and the error that brings in, has simplified the operating procedure, and does not reduce the precision to work efficiency has been improved.

Example 4

The utility model discloses a 50mL volumetric flask, when the volume of 4 parts of many scale marks of its neck 2 is 5mL, the volume between per two adjacent scale lines is 0.05mL, at the in-process of configuration solution, because the precision is higher than prior art, the inside diameter of pipe is less, expands the convenient different thickness glass stick that sets up of structure 5 when leading the inflow bottle with the glass stick and stretches into.

Example 5

The solution with a certain concentration of 98.5mL is needed, the prior art selects a volumetric flask with 250mL for configuration, then 98.5mL is moved for use, 98.5mL is moved for at least 4 times, namely 50.0mL, 25.0mL, 20.0mL, 3.50mL, or 50.0mL, 20.0mL, 8.50mL, at least 3 pipettes with different capacities are used, 4 times are read, the utility model discloses a volumetric flask with 100mL 'measuring', the partial volume of a plurality of scales 4 on the neck of the volumetric flask is 10mL, one scale line in the middle is a 100.00mL scale line, the range of the settable volume is 95.00-105.00, 98.50 mL can be directly configured, then the volumetric flask is poured out for use, time saving, labor saving and high efficiency are achieved, and error accumulation of multiple readings is avoided.

The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. A volumetric flask capable of fixing a plurality of volumes with different volumes is characterized by comprising: the bottle comprises a bottle body (1), a neck (2) and a bottle mouth plug (3), wherein the outer surface of the neck (2) is provided with a plurality of scale marks (4) and corresponding capacity digital marks (5);

one of the middle of the plurality of scale marks (4) is used for designing a volume (6) for the volumetric flask;

the part of the neck part (2) close to the bottle mouth part is provided with an expansion structure (7), so that the glass rod can extend into the neck part (2) under the condition that the inner diameter of the neck part is too small to guide the glass rod to flow into the bottle;

the volume of the part of the plurality of scale marks (4) of the neck (2) is 1-20 mL;

the scale marks (4) indicate the measured volume of the solution, and the measured volume is marked above the scale marks (4);

and when the scale marks (4) represent the volume of the measured solution, the scale marks (4) are marked with 'measuring in' or no mark.

2. Volumetric flask capable of metering a plurality of different volumes according to claim 1, characterized in that the body (1) of the flask is pear-shaped with a flat bottom and the neck (2) is of elongated tubular structure.

3. A volumetric flask capable of fixing a plurality of volumes with different volumes as claimed in claim 1, characterized in that the material of the volumetric flask is a transparent material which does not react with the components of the solution to be fixed.

4. A volumetric flask capable of fixing a plurality of volumes with different volumes as claimed in claim 3, wherein the glass volumetric flask mouth and the bottle mouth plug are connected by grinding.