CN212284082U - Quantitative pipette - Google Patents
Quantitative pipette Download PDFInfo
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- CN212284082U CN212284082U CN202021813108.XU CN202021813108U CN212284082U CN 212284082 U CN212284082 U CN 212284082U CN 202021813108 U CN202021813108 U CN 202021813108U CN 212284082 U CN212284082 U CN 212284082U
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- glass tube
- liquid
- air bag
- connecting sleeve
- sleeve column
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Abstract
A quantitative pipette comprises a quantitative glass tube and an air bag ball; the upper end and the lower end of the glass tube are in a pointed cone shape and are respectively used as a liquid inlet and a liquid outlet, and limiting plates are arranged below the upper part of the outer side of the glass tube; the inner lower end of the air bag ball is provided with an integrally formed connecting sleeve column, the inner side of the connecting sleeve column is provided with a cylindrical through hole from top to bottom, the height of the connecting sleeve column is higher than that of the inner lower end of the air bag ball, one side of the lower end of the connecting sleeve column is provided with a liquid discharge hole, and the upper end of the glass tube is sleeved inside the connecting sleeve column from bottom to top. The utility model discloses simple structure is compact, convenient to use. This is novel in shifting liquid, owing to do not need the operator to keep pressing the state of gasbag ball with the hand, can bring facility for operating personnel's operation. When the liquid moves to a required position, an operator presses the air bag ball, and because the height of the upper end of the glass tube is higher than that of the lower end of the air bag ball, redundant liquid cannot enter the glass tube again, the purpose of accurately transferring the liquid is achieved, and convenience is brought to the operation of the operator.
Description
Technical Field
The utility model relates to an equipment technical field, especially a quantitative pipette that the laboratory used.
Background
The pipette is a measuring device for accurately moving and taking a certain volume of solution, and mainly comprises an ear-sucking ball and a long glass tube (the long glass tube is sleeved in a suction hole in the middle of the lower end of the ear-sucking ball) with scale values on the outer side, wherein the scale values are used as marks of the accurate volume of the taken liquid. When the existing pipette is used for transferring liquid, the lower end of the glass tube is inserted into the liquid, then the suction ball is squeezed by hands, the suction ball generates negative pressure suction force to suck the liquid into the glass tube, and the purpose of transferring the liquid is further achieved.
When the prior pipette is used for accurately pipetting (a plurality of physicochemical experiments and the like need accurate liquid amount), two methods are generally adopted. The first is to use a long glass tube with allowance to be sleeved in a suction hole at the lower end of an ear-sucking ball, when the liquid amount sucked in is increased to a scale value required by the front end of the glass tube during pipetting, an operator keeps the strength of pressing the ear-sucking ball by hands, so that the liquid amount is positioned in the glass tube and is at the pipetting amount required by the operator, then the lower end of the glass tube is taken out of the liquid, and the sucked liquid is put into an experimental bottle and the like; according to the operation method, the force of pressing the suction bulb by a hand is not easy to master, the accuracy of the sucked liquid amount cannot be effectively guaranteed, and in the process of transferring the glass tube from the liquid suction to an experiment bottle and the like, the force of pressing the suction bulb by the hand is easy to change, so that the liquid leaks from the lower end of the glass tube and the like, and the influence is brought to the accurate liquid transfer (even if an operator blocks the lower end of the glass tube by the hand after sucking the liquid to prevent the liquid from leaking, when the sucked liquid is corrosive, unnecessary safety risks can be brought to the operator, and the problem that the accuracy of the initial sucked liquid amount cannot be effectively guaranteed in actual operation). The second mode is that the glass tube (that is, the glass tube is filled with liquid and then the required quantitative liquid transfer amount) with a specific scale value is installed at the lower end of the suction bulb for liquid transfer operation, which can ensure that the liquid sucked into the glass tube reaches the required liquid transfer amount, but can not prevent the liquid from entering the suction bulb through the upper end of the glass tube, so that the liquid can not be transferred accurately because the glass tube and the suction bulb are filled with liquid at the same time (when the suction bulb is pressed to discharge the liquid in the glass tube subsequently, the liquid in the suction bulb can be discharged at the same time, thereby causing influence on the accurate liquid transfer), and particularly, when the operation of an inexperienced operator is performed, the problems are more prominent.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defect that the precise liquid transfer cannot be effectively ensured by the structure of some liquid transfer tubes, the utility model provides a quantitative glass tube with a plurality of different volumes, the glass tube and an air bag ball can be conveniently separated and combined, the inner upper end of the lower part of the air bag ball is provided with a connecting sleeve column higher than the surrounding of the inner lower side, the lower side end of the connecting sleeve column is provided with an opening, after the upper part of the glass tube is inserted into the connecting sleeve column, the upper end of the glass tube is higher than the inner lower end of the air bag ball, when an operator carries out liquid transfer operation, after the air bag ball glass tube is fully filled with liquid by pressing the air bag ball glass tube, the redundant liquid can overflow from the upper end of the glass tube to the lower part of the air bag ball, the precise liquid transfer can be ensured, in the process of transferring the glass tube from the liquid absorption to an experiment bottle and the like, the operator does not need to press the air bag ball all, the operator can conveniently take off the glass tube and emit unnecessary liquid in the gasbag ball, reaches a quantitative pipette that provides powerful technical support for accurate liquid removal from this.
The utility model provides a technical scheme that its technical problem adopted is:
a quantitative pipette comprises a plurality of quantitative glass tubes with different volumes and an air bag ball; the device is characterized in that the upper end and the lower end of each glass tube are in a sharp cone shape and respectively used as a liquid inlet and a liquid outlet, and a position below the upper part of the outer side of each glass tube is provided with a limit plate; the inner lower end of the air bag ball is provided with an integrally formed connecting sleeve column, the inner side of the connecting sleeve column is provided with a cylindrical through hole from top to bottom, and the inner diameter of the cylindrical through hole is smaller than the outer diameter of the middle part of the glass tube and larger than the outer diameter of the liquid outlet; the height of the connecting sleeve column is higher than that of the lower end in the air bag ball, and the lower part in the air bag ball is of a horizontal structure; and a liquid discharge hole communicated with the inner lower part of the air bag ball is formed in one side of the lower end of the connecting sleeve column, the upper end of the glass tube is sleeved inside the connecting sleeve column from bottom to top, the upper end of the limiting plate is positioned at the lower end of the air bag ball, and the upper end of the glass tube is higher than the upper end of the connecting sleeve column.
Furthermore, the drain hole of the connecting sleeve column is not limited to one, and a plurality of spaced distances can be distributed at the lower end of the connecting sleeve column.
Further, the air bag ball is made of rubber.
Furthermore, after the glass tube is sleeved in the connecting sleeve column of the air bag ball, the inner side of the connecting sleeve column, the liquid discharge hole and the outer side of the glass tube are in interference fit.
Furthermore, the outer diameters of the quantitative glass tubes with different volumes are consistent, and the distances from the limiting plates of the glass tubes to the upper ends of the glass tubes are equal.
Furthermore, the limiting plate can be replaced by arranging limiting blocks on one side and two sides of the glass tube.
The utility model has the advantages of simple and compact structure and convenient use. When the glass tube is used, the lower end of the glass tube is placed into liquid needing to be transferred, then an operator presses the air bag ball and releases the hand, negative pressure generated by the air bag ball can enable all liquid in the glass tube to be sucked, and redundant liquid can enter the lower end of the air bag ball from the upper end of the glass tube. The utility model discloses in shifting liquid, owing to do not need the operator to keep pressing the state of gasbag ball with the hand, can bring facility for operating personnel's operation. When the liquid moves to a required position, an operator presses the air bag ball, so that all liquid in the glass tube can flow into an experimental bottle and the like. Based on the foregoing, the utility model discloses good application prospect has.
Drawings
The invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a schematic view of the structure of the airbag ball of the present invention.
Fig. 3 is a schematic view of the quantitative glass tube structure of the present invention.
Detailed Description
As shown in fig. 1, 2 and 3, a quantitative pipette comprises a plurality of quantitative glass tubes 1 with different volumes marked with scale values, an air bag ball 2 (the upper end is spherical, and the lower end of the middle part is cylindrical); the upper end and the lower end of each glass tube 1 are in a sharp cone shape and respectively used as a liquid inlet 101 and a liquid outlet 102, and a circular limiting plate 103 is arranged at a certain position below the upper part of the outer side of each glass tube 1; the lower end in the middle of the air bag ball is provided with an integrally formed connecting sleeve column 21, the inner side of the connecting sleeve column 21 is provided with a cylindrical through hole 22 from top to bottom, the inner diameter of the cylindrical through hole 22 is slightly smaller than the outer diameter of the middle of the glass tube 1 by 1mm (the cylindrical through hole 22 has elasticity, the glass tube 1 can be inserted into the elastic through hole), and the inner diameter is larger than the outer diameters of the liquid outlet at the uppermost end and the liquid inlet at the lowermost end of the glass tube 1; the height of the connecting sleeve column 21 is higher than that of the inner lower end of the air bag ball 2, and the inner part of the air bag ball 2 at the periphery of the lower outer end of the connecting sleeve column 21 is of a horizontal structure; a liquid discharge hole 23 communicated with the inner lower part of the air bag ball is formed in the left side of the lower end of the connecting sleeve column of the air bag ball 2, the upper end of the glass tube 1 is sleeved inside the connecting sleeve column 21 from bottom to top, the upper end of the limiting plate 103 is located at the lower end of the air bag ball 2, and the upper end of the glass tube 1 is higher than the height of the upper end of the connecting sleeve column 21.
As shown in fig. 1, 2 and 3, the drain hole 23 of the connecting sleeve is not limited to one, and a plurality of drain holes may be provided at a certain interval at the lower end of the connecting sleeve. The air bag ball 2 is made of rubber. After the glass tube 1 is sleeved in the connecting sleeve column 21 of the balloon, the inner side of the connecting sleeve column 21, the liquid discharge hole 23 and the outer side of the glass tube 1 are in interference fit (no liquid leakage). The outer diameters of a plurality of quantitative glass tubes 1 with different volumes are completely consistent, and the spacing between the limiting plates 103 of the plurality of glass tubes 1 and the upper ends of the glass tubes 1 is equal. The limiting plate 103 can be replaced by a rectangular limiting block arranged on one side and two sides of the glass tube.
As shown in fig. 1, 2 and 3, the utility model has simple and compact structure and convenient use. Before use, the glass tube 1 with the required volume is selected according to requirements (after the glass tube is fully filled with the liquid 3, the liquid amount is the required liquid moving amount), and is inserted into the connecting sleeve column 21 of the air bag ball 2 from bottom to top, so that the upper end of the limiting plate 103 is just contacted with the outer side of the lower end of the air bag ball 2. When the liquid is transferred, the lower end of the glass tube 1 is placed into the liquid 3 needing to be transferred, then an operator releases the hand after pressing the air bag ball 2, so that the negative pressure generated by the air bag ball 2 can enable all the liquid 3 in the glass tube 1 to be sucked (the hand for pressing the air bag ball 2 is released after the air bag ball 2 is filled with the liquid), and the redundant liquid 3 can enter the lower end of the air bag ball 2 from the liquid outlet 102 at the upper end part of the glass tube 1. The utility model discloses 1 lower extreme of glass pipe is sharp toper thin mouthful (inlet 101), mainly plays liquid 3 can not be because of the too big water clock of glass pipe lower extreme trompil in moving the liquid. The tapered thin opening (liquid outlet 102) at the upper end of the glass tube 1 is used for sucking the liquid 3, and when the liquid 3 reaches the upper end tube opening of the glass tube 1, the flow rate is slower, so that the liquid cannot directly flow into the air bag ball 2 in a large amount. The utility model discloses in shifting liquid 3, owing to do not need the operator to keep pressing the state of gasbag ball 2 with the hand, can bring the facility for operating personnel's operation. After the liquid moves to the required position, the operator presses the air bag ball 2, so that all liquid in the glass tube 1 can flow into the experiment bottle and the like, and because the height of the upper end of the glass tube 1 is higher than that of the lower end in the air bag ball 2, redundant liquid 3 can not enter the glass tube 1 again, the purpose of accurately transferring liquid is achieved, and convenience is brought to the operation of the operator. The utility model discloses move liquid and finish back detachable glass pipe 1 according to pressing gasbag ball 2, just can discharge unnecessary liquid 3 in the gasbag ball 2 from outage 23, for next move liquid and prepare well.
The basic principles and essential features of the invention and the advantages of the invention have been shown and described above, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing exemplary embodiments, but rather can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims (6)
1. A quantitative pipette comprises a plurality of quantitative glass tubes with different volumes and an air bag ball; the device is characterized in that the upper end and the lower end of each glass tube are in a sharp cone shape and respectively used as a liquid inlet and a liquid outlet, and a position below the upper part of the outer side of each glass tube is provided with a limit plate; the inner lower end of the air bag ball is provided with an integrally formed connecting sleeve column, the inner side of the connecting sleeve column is provided with a cylindrical through hole from top to bottom, and the inner diameter of the cylindrical through hole is smaller than the outer diameter of the middle part of the glass tube and larger than the outer diameter of the liquid outlet; the height of the connecting sleeve column is higher than that of the lower end in the air bag ball, and the lower part in the air bag ball is of a horizontal structure; and a liquid discharge hole communicated with the inner lower part of the air bag ball is formed in one side of the lower end of the connecting sleeve column, the upper end of the glass tube is sleeved inside the connecting sleeve column from bottom to top, the upper end of the limiting plate is positioned at the lower end of the air bag ball, and the upper end of the glass tube is higher than the upper end of the connecting sleeve column.
2. The pipette of claim 1 wherein the drainage hole of the connecting stem is not limited to one but can be distributed at the lower end of the connecting stem by a plurality of spaced distances.
3. A dosing pipette as claimed in claim 1, characterised in that the balloon ball is of rubber material.
4. The dosing pipette of claim 1 wherein the glass tube is held in interference fit with the inside of the connecting stem of the balloon and the drain hole and the outside of the glass tube after the glass tube is received within the connecting stem.
5. The pipette of claim 1 wherein the plurality of glass tubes have substantially the same outside diameter and are spaced apart from the limiting plate to the upper end of the glass tube.
6. The pipette of claim 1 wherein the stopper is replaced by stoppers on one and both sides of the glass tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021813108.XU CN212284082U (en) | 2020-08-26 | 2020-08-26 | Quantitative pipette |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021813108.XU CN212284082U (en) | 2020-08-26 | 2020-08-26 | Quantitative pipette |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212284082U true CN212284082U (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021813108.XU Active CN212284082U (en) | 2020-08-26 | 2020-08-26 | Quantitative pipette |
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| Country | Link |
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| CN (1) | CN212284082U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992261A (en) * | 2020-08-26 | 2020-11-27 | 上海菁一科技有限公司 | Quantitative pipette |
-
2020
- 2020-08-26 CN CN202021813108.XU patent/CN212284082U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111992261A (en) * | 2020-08-26 | 2020-11-27 | 上海菁一科技有限公司 | Quantitative pipette |
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