CN214974098U - Volumetric flask with convenient constant volume - Google Patents
Volumetric flask with convenient constant volume Download PDFInfo
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- CN214974098U CN214974098U CN202120743100.9U CN202120743100U CN214974098U CN 214974098 U CN214974098 U CN 214974098U CN 202120743100 U CN202120743100 U CN 202120743100U CN 214974098 U CN214974098 U CN 214974098U
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- volumetric flask
- constant volume
- water injection
- injection hole
- bottle cap
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Abstract
The utility model discloses a volumetric flask of convenient constant volume belongs to volumetric flask technical field. The utility model provides a make things convenient for volumetric flask of constant volume, including the volumetric flask body, first bottle lid and second bottle lid, be equipped with the scale mark on the volumetric flask body, volumetric flask body top is located to first bottle lid, the water injection hole has been seted up at first bottle lid center, be equipped with the fixed part on the water injection hole inner wall, fixed part intermediate position accessible rubber head drip tube, be equipped with first sealing on the all the other positions of detaching the fixed part on the water injection hole inner wall, the water injection hole is located to the second bottle lid, the latter half of second bottle lid can be through the intermediate position in the fixed part, second bottle lid lower half is equipped with the second sealing, the second sealing can reach sealed effect with first sealing mutual extrusion, the liquid that can instil into when the constant volume rubber head drip tube can not be when the constant volume drips to the volumetric flask inner wall carelessly, need not wait to wait in the liquid on the inner wall flows into the bottle completely.
Description
Technical Field
The utility model relates to a volumetric flask technical field, more specifically say, relate to a volumetric flask of convenient constant volume.
Background
Volumetric flasks are precision instruments used to prepare solutions of exact quantitative concentrations of a substance. It is a long and thin neck pear-shaped flat-bottom glass bottle with a ground glass stopper, and scales are arranged on the neck. When the volume in the bottle reaches the marked point at the specified temperature, the volume is the indicated volume number.
The conventional volumetric flasks are classified according to their specifications, and generally have several specifications such as 25, 50, 100, 250, 500, 1000mL and the like.
When a volumetric flask is used for preparing a solution with a certain amount and concentration of a substance, a constant volume step is provided, when the liquid surface is about to touch a marked line, a rubber-tipped dropper is required to be changed into the constant volume step for slowly dropping, but a conventional volumetric flask can shake hands or drop on the inner wall of the volumetric flask carelessly, so that the liquid needs to flow into the solution completely, a certain time is required, and the concentration of the prepared solution can be influenced.
SUMMERY OF THE UTILITY MODEL
1. Technical problem to be solved
To the problem that exists among the prior art, the utility model aims to provide a volumetric flask of convenient constant volume, it can be when the constant volume fixed rubber head drip tube can not drip into liquid carelessly to the volumetric flask inner wall in the time, need not to wait that liquid on the inner wall flows into in the bottle completely.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
A volumetric flask convenient for constant volume comprises a volumetric flask body, a first bottle cap and a second bottle cap;
the volumetric flask body is provided with scale marks;
the first bottle cover is arranged at the top of the volumetric flask body;
a water injection hole is formed in the center of the first bottle cap;
a fixing part is arranged on the inner wall of the water injection hole, and a rubber head dropper can pass through the middle position of the fixing part;
the other positions on the inner wall of the water injection hole except the fixed part are provided with first sealing parts;
the second bottle cap is arranged in the water injection hole, and the lower half part of the second bottle cap can pass through the middle position in the fixing part;
the lower half part of the second bottle cap is provided with a second sealing part, and the second sealing part and the first sealing part can be mutually extruded to achieve the sealing effect.
Furthermore, the fixing part is a circular plate, and a through hole is formed in the middle of the fixing part.
Furthermore, the fixing part is positioned at the upper middle position in the water injection hole.
Furthermore, the fixing part is fixedly connected with the first bottle cap.
Further, the first sealing portion is made of a flexible material.
Furthermore, the diameter of the part, extending into the water injection hole, of the second bottle cap is equal to that of the through hole in the fixing part.
Further, the diameter of the second sealing portion is larger than that of the first sealing portion.
Furthermore, the water injection hole is fixedly connected with the first sealing part.
3. Advantageous effects
Compared with the prior art, the utility model has the advantages of:
(1) this scheme can be when the constant volume fixed rubber head drip tube can not the time liquid that instils into drip to the volumetric flask inner wall carelessly on, need not to wait that the liquid on the inner wall flows into the bottle completely.
(2) The arrangement of the fixing part can ensure that the rubber head dropper keeps fixed in the process of dropping liquid and does not drop the liquid to other positions.
(3) Simple structure and convenient use.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a cross-sectional view of a first bottle cap according to the present invention;
fig. 3 is a schematic structural view of a second bottle cap according to the present invention;
the reference numbers in the figures illustrate:
the measuring flask comprises a volumetric flask body 1, scale marks 2, a first bottle cap 3, a second bottle cap 4, a water injection hole 5, a first sealing part 6, a fixing part 7 and a second sealing part 8.
Detailed Description
Please refer to fig. 1-3, which is a volumetric flask with convenient constant volume, comprising a volumetric flask body 1, a first flask cover 3 and a second flask cover 4.
The volumetric flask body 1 is provided with scale marks 2.
The first bottle cap 3 is arranged on the top of the volumetric flask body 1.
The center of the first bottle cap 3 is provided with a water injection hole 5.
The inner wall of the water injection hole 5 is provided with a fixing part 7, and the middle position of the fixing part 7 can pass through a rubber head dropper.
The first sealing part 6 is arranged on the inner wall of the water injection hole 5 except the fixing part 7.
The second cap 4 is disposed in the filling hole 5, and the lower half portion of the second cap 4 may pass through the middle position in the fixing portion 7.
The lower half part of the second bottle cap 4 is provided with a second sealing part 8, and the second sealing part 8 and the first sealing part 6 can be mutually extruded to achieve the sealing effect.
The fixing part 7 is a circular plate, and a through hole is formed in the middle of the fixing part.
The fixing part 7 is positioned at the upper middle position in the water injection hole 5.
The fixing part 7 is fixedly connected with the first bottle cap 3.
The first seal portion 6 is made of a flexible material.
The diameter of the part of the second bottle cap 4 extending into the water injection hole 5 is equal to that of the through hole in the fixing part 7.
The diameter of the second seal portion 8 is larger than the diameter of the first seal portion 6.
The water injection hole 5 is fixedly connected with the first sealing part 6.
When the bottle cap is used, a series of operations before constant volume are firstly carried out, then, a solution is added into the volumetric flask from the scale mark by about 0.5-1 cm, the first bottle cap 3 is covered, then, the rubber dropper is stretched into the water injection hole 5, the part with the largest diameter of the rubber dropper can be clamped by the fixing part 7, the inner diameter of the fixing part 7 is equal to the diameter of the rubber dropper, the displacement of the rubber dropper in the horizontal direction is limited, so that the rubber dropper can not contact the inner wall of the water injection hole 5 and can not contact the inner wall of the volumetric flask body 1, most importantly, the liquid dripped by the rubber dropper can be dripped into the center of the volumetric flask and can not be dripped onto the inner wall of the volumetric flask due to hand shaking or other factors, and the second bottle cap 4 is covered after the constant volume is finished, and subsequent operations of the constant volume are carried out.
Claims (8)
1. The utility model provides a volumetric flask of convenient constant volume which characterized in that: comprises a volumetric flask body (1), a first bottle cap (3) and a second bottle cap (4);
the volumetric flask body (1) is provided with scale marks (2);
the first bottle cap (3) is arranged at the top of the volumetric flask body (1);
a water injection hole (5) is formed in the center of the first bottle cap (3);
a fixing part (7) is arranged on the inner wall of the water injection hole (5), and a rubber head dropper can pass through the middle position of the fixing part (7);
a first sealing part (6) is arranged on the inner wall of the water injection hole (5) except the fixing part (7);
the second bottle cap (4) is arranged in the water injection hole (5), and the lower half part of the second bottle cap (4) can pass through the middle position in the fixing part (7);
the lower half part of the second bottle cap (4) is provided with a second sealing part (8), and the second sealing part (8) and the first sealing part (6) can be mutually extruded to achieve the sealing effect.
2. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the fixing part (7) is a circular plate, and a through hole is formed in the middle of the fixing part.
3. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the fixing part (7) is positioned at the upper middle position in the water injection hole (5).
4. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the fixing part (7) is fixedly connected with the first bottle cap (3).
5. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the first seal portion (6) is made of a flexible material.
6. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the diameter of the part of the second bottle cap (4) extending into the water injection hole (5) is equal to that of the through hole in the fixing part (7).
7. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the diameter of the second seal portion (8) is larger than the diameter of the first seal portion (6).
8. A volumetric flask convenient for constant volume according to claim 1, characterized in that: the water injection hole (5) is fixedly connected with the first sealing part (6).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202120743100.9U CN214974098U (en) | 2021-04-13 | 2021-04-13 | Volumetric flask with convenient constant volume |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202120743100.9U CN214974098U (en) | 2021-04-13 | 2021-04-13 | Volumetric flask with convenient constant volume |
Publications (1)
Publication Number | Publication Date |
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CN214974098U true CN214974098U (en) | 2021-12-03 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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CN202120743100.9U Active CN214974098U (en) | 2021-04-13 | 2021-04-13 | Volumetric flask with convenient constant volume |
Country Status (1)
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CN (1) | CN214974098U (en) |
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2021
- 2021-04-13 CN CN202120743100.9U patent/CN214974098U/en active Active
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