A quantitative straw

Abstract

The invention discloses a quantitative pipette, comprising a top air bag, a connecting tube, an overflow storage tube and a pipette. The invention designs the upper and lower ends of the pipette to be conical structures respectively, and the inner cavity of the upper end of the pipette is a conical structure with a small top and a large bottom, and the inner cavity of the lower end of the pipette is a conical structure with a large top and a small bottom, so that the diameters of the openings at the upper and lower ends of the pipette are greatly reduced, so that the forces between the liquid and the solid at the upper and lower ends of the pipette are reduced, and the volume of the inner concave or outer convex of the liquid is greatly reduced, and the accuracy of collection is greatly improved. It is also easier to squeeze and discharge, and the residual amount is small.

Description

Technical Field

[0001] The invention relates to a quantitative drinking straw. Background Art

[0002] Quantitative pipetting is a step that needs to be implemented all the time in all physical, chemical and biological laboratories. Glass or plastic pipettes are used for large-volume pipetting both at home and abroad, such as Figure 1 As shown, the core structure of this type of pipette generally includes an air bag 91, a vent tube 92, a liquid storage tube 93, and a capillary tube 94. The lower end of the air bag 91 is connected to the liquid storage tube 93 through the vent tube 92, and the upper end of the capillary tube 94 is inserted and fixedly connected to the lower end of the liquid storage tube 93. In this way, by gently squeezing the air bag 91, the capillary tube 94 is sent into the collected liquid, and then the air bag 91 is released, so that the liquid enters the capillary tube 94, and the excess liquid at the upper end of the capillary tube 94 will overflow and be stored in the liquid storage tube 93, so that quantitative collection is achieved. However, due to the force between the liquid surface and the solid surface, The liquid sucked by the capillary has a convex or concave structure at the openings at both ends of the capillary, so that the actual collected liquid volume is inconsistent with the internal volume of the capillary, which makes the liquid collection accuracy not high and cannot meet the standards in some fields requiring high precision. In addition, the existing capillary is generally an integrated structure. When the collected volume needs to be changed, the entire capillary or even the entire product needs to be replaced, which makes it very inflexible in actual use. At the same time, when the operator squeezes the airbag 91 with too much force, the liquid will be directly sucked into the airbag 91 above, making it unusable for subsequent operations. Summary of the invention

[0003] In view of the above-mentioned deficiencies of the prior art, the present invention solves the problem of providing a quantitative pipette with high liquid collection accuracy, convenient capacity replacement, and reduced probability of liquid rushing into the air bag due to excessive force.

[0004] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0005] A quantitative pipette comprises a top airbag, a connecting tube, an overflow storage tube and a pipette; the lower end of the top airbag is connected to the connecting tube, the lower end of the connecting tube is connected to the overflow storage tube, and the connecting tube is connected between the top airbag and the overflow storage tube; a pipette is sealed and plugged into the lower end of the overflow storage tube; the upper end of the pipette is inserted into the middle of the overflow storage tube, and the lower end of the pipette is located below the overflow storage tube; the outer side around the upper end of the pipette and the inner side around the overflow storage tube form an annular cavity; the inner cavities at the upper and lower ends of the pipette are respectively in a conical structure, the inner cavity at the upper end of the pipette is in a conical structure that is small at the top and large at the bottom, and the inner cavity at the lower end of the pipette is in a conical structure that is large at the top and small at the bottom.

[0006] Furthermore, the pipette is of an integrated structure; the outer side around the upper end of the pipette is sealed and fixed to the inner side around the lower end of the overflow storage tube.

[0007] Furthermore, the suction tube has a separate structure; the suction tube includes an upper positioning tube and a lower disassembly tube; the upper end of the upper positioning tube is plugged and fixed inside the lower end of the overflow storage tube; the upper end of the lower disassembly tube is movably sleeved and connected to the lower end of the upper positioning tube.

[0008] Furthermore, the outer side of the upper positioning tube is sealed and fixed to the inner side of the lower end of the overflow storage tube.

[0009] Furthermore, the inner cavity at the upper end of the upper positioning tube presents a conical structure that is small at the top and large at the bottom; and the inner cavity at the lower end of the lower disassembly tube presents a conical structure that is large at the top and small at the bottom.

[0010] Furthermore, a conical sleeve joint is provided at the upper end of the lower disassembly tube; the conical sleeve joint is a conical structure with a larger upper portion and a smaller lower portion; the upper end of the lower disassembly tube is movably connected to the outer side around the lower end of the upper positioning tube through the conical sleeve joint.

[0011] Further, the connecting pipe between the top airbag and the overflow storage pipe is located in the middle or on one side between the top airbag and the overflow storage pipe.

[0012] Furthermore, reinforcement strips are provided on both sides of the connecting tube; the upper and lower ends of the reinforcement strips are respectively connected between the top airbag and the overflow storage tube.

[0013] Furthermore, the connecting tube, overflow storage tube and liquid pipette are made of glass or polymer material.

[0014] Furthermore, the top airbag has a flat or ellipsoidal structure.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The present invention designs the upper and lower ends of the pipette to be conical structures respectively, and the inner cavity of the upper end of the pipette is a conical structure with a small upper part and a large lower part, and the inner cavity of the lower end of the pipette is a conical structure with a large upper part and a small lower part. In this way, the diameters of the openings at the upper and lower ends of the pipette are greatly reduced, so that the forces between the liquid and the solid at the upper and lower ends of the pipette are reduced, the volume of the inner concave or outer convex of the liquid is greatly reduced, the accuracy of collection is greatly improved, and it is easier to squeeze and discharge, and the residual amount is small.

[0017] 2. The present invention makes the liquid suction tube a separate structure, including an upper positioning tube and a lower disassembly tube. The upper end of the upper positioning tube is plugged and fixed inside the lower end of the overflow storage tube, and the upper end of the lower disassembly tube is movably connected to the lower end of the upper positioning tube. In this way, the lower disassembly tubes of different volumes can be replaced according to actual needs, while the volume of the upper positioning tube remains unchanged, so that flexible adjustment of various suction volumes can be achieved.

[0018] 3. The present invention can set the connecting tube between the top airbag and the overflow storage tube on one side between the top airbag and the overflow storage tube. The essence is to eccentrically set the vent between the lower end of the connecting tube and the upper end of the overflow storage tube so that the vent is located on one side of the upper end of the overflow storage tube to form an eccentric ventilation structure. In this way, when the operator inhales too much liquid with excessive force, the vent deviates from the middle of the upper end of the overflow storage tube. When the liquid moves upward, it will be blocked by the upper end of the overflow storage tube, which greatly reduces the probability of the liquid directly rushing into the top airbag. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the existing structure.

[0020] Figure 2 This is a schematic diagram of the structure of Example 1 of the present invention.

[0021] Figure 3 For the present invention Figure 2 Schematic diagram of the split structure.

[0022] Figure 4 This is a schematic diagram of the structure of Example 2 of the present invention.

[0023] Figure 5 For the present invention Figure 4 Schematic diagram of the split structure.

[0024] Figure 6 This is a schematic diagram of the structure of Example 3 of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of Example 4 of the present invention. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Example 1

[0028] like Figure 2 and 3As shown, a quantitative pipette comprises a top airbag 1, a connecting tube 2, an overflow storage tube 3, and a pipette 4; the lower end of the top airbag 1 is connected to and installed with the connecting tube 2, and the lower end of the connecting tube 2 is connected to and installed with the overflow storage tube 3, and the connecting tube 2 is located in the middle position between the top airbag 1 and the overflow storage tube 3; a pipette 4 is sealed and plugged into the lower end of the overflow storage tube 3; the upper end of the pipette 4 is inserted and connected to the middle of the overflow storage tube 3, and the lower end of the pipette 4 is located below the overflow storage tube 3; the outer side around the upper end of the pipette 4 and the inner side around the overflow storage tube 3 form an annular cavity; the inner cavities at the upper and lower ends of the pipette 4 are respectively in a conical structure, the upper end 41 of the pipette 4 is a conical structure with a small upper part and a large lower part, and the lower end 42 of the pipette 4 is a conical structure with a large upper part and a small lower part. Furthermore, the pipette 4 is an integrated structure; the outer side around the upper end of the pipette 4 is sealed and fixed to the inner side around the lower end of the overflow storage tube 3, which can be fixed by glue, or directly inserted and sealed, or other methods can be selected. Further, reinforcing strips 11 are provided on both sides of the connecting tube 2; the upper and lower ends of the reinforcing strip 11 are respectively connected between the top airbag 1 and the overflow storage tube 3. Further, the connecting tube 2, the overflow storage tube 3, and the pipette 4 are made of glass or polymer material. Further, the top airbag 1 is a flat or ellipsoidal structure.

[0029] The present invention designs the upper and lower ends of the pipette 4 to be conical structures respectively, the upper end 41 of the pipette 4 is a conical structure that is small at the top and large at the bottom, and the lower end 42 of the pipette 4 is a conical structure that is large at the top and small at the bottom, so that the diameters of the openings at the upper and lower ends of the pipette 4 are greatly reduced, so that the forces between the liquid and the solid at the upper and lower ends of the pipette 4 are reduced, the volume of the liquid concave or convex, the accuracy of collection is greatly improved, and it is easier to squeeze and discharge, with a small residual amount.

[0030] Example 2

[0031] This embodiment refers to the embodiment 1, except that the structure of the pipette is as follows: Figure 4 and 5As shown, the liquid pipette 4 is a separated structure; the liquid pipette 4 includes an upper positioning tube 43 and a lower disassembly tube 44; the upper end of the upper positioning tube 43 is plugged and fixed inside the lower end of the overflow storage tube 3; the upper end of the lower disassembly tube 44 is movably sleeved and connected to the lower end of the upper positioning tube 43. Further, the outer side of the upper positioning tube 43 is sealed and fixed to the inner side of the lower end of the overflow storage tube 3, which can be sealed and fixed by glue bonding, or directly and tightly plugged to achieve sealing. Further, the upper end 431 of the upper positioning tube 43 is a conical structure with a small upper part and a large lower part; the lower end 441 of the lower disassembly tube 44 is a conical structure with a large upper part and a small lower part. Furthermore, a conical sleeve joint 442 is provided at the upper end of the lower disassembly tube 44; the conical sleeve joint 442 is a conical structure with a larger upper portion and a smaller lower portion; the upper end of the lower disassembly tube 44 is movably connected to the outer side around the lower end of the upper positioning tube 43 through the conical sleeve joint 442.

[0032] The present invention makes the liquid suction tube 4 a separate structure, including an upper positioning tube 43 and a lower disassembly tube 44. The upper end of the upper positioning tube 43 is plugged and fixed inside the lower end of the overflow storage tube 3, and the upper end of the lower disassembly tube 44 is movably sleeved and connected to the lower end of the upper positioning tube 43. In this way, the lower disassembly tube 44 of different volumes can be replaced according to actual needs, while the volume of the upper positioning tube 43 remains unchanged, so that flexible adjustment of various suction volumes can be achieved.

[0033] Example 3

[0034] like Figure 6 As shown, this embodiment refers to the embodiment 1, but differs in that the present invention arranges the connecting pipe 2 at a position on one side of the middle between the top airbag 1 and the overflow storage pipe 3 to form an eccentric ventilation structure.

[0035] Example 4

[0036] like Figure 7 As shown, this embodiment refers to Embodiment 2, but differs in that the present invention arranges the connecting pipe 2 at a position on one side of the middle between the top airbag 1 and the overflow storage pipe 3 to form an eccentric ventilation structure.

[0037] The above-mentioned embodiments 3 and 4 can greatly reduce the probability of liquid directly rushing into the top airbag 1 when excessive force is applied. The present invention can arrange the connecting tube 2 between the top airbag 1 and the overflow storage tube 3 on one side between the top airbag 1 and the overflow storage tube 3. The essence is to eccentrically arrange the vent 21 between the lower end of the connecting tube 2 and the upper end of the overflow storage tube 3 so that the vent 21 is located on one side of the upper end of the overflow storage tube 3 to form an eccentric ventilation structure. In this way, when the operator applies excessive force and inhales too much liquid, since the vent 21 deviates from the middle of the upper end of the overflow storage tube 3, the liquid will be blocked by the upper end of the overflow storage tube 3 when moving upward, which greatly reduces the probability of liquid directly rushing into the top airbag 1.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A quantitative straw, characterized in that: The invention comprises a top air bag, a connecting pipe, an overflow storage pipe and a liquid suction pipe; the lower end of the top air bag is connected to the connecting pipe, the lower end of the connecting pipe is connected to the overflow storage pipe, and the connecting pipe is connected between the top air bag and the overflow storage pipe; a liquid suction pipe is sealed and plugged into the lower end of the overflow storage pipe; the upper end of the liquid suction pipe is inserted and connected to the middle of the overflow storage pipe, and the lower end of the liquid suction pipe is located below the overflow storage pipe; the outer side of the upper end of the liquid suction pipe is connected to the inner side of the overflow storage pipe An annular cavity is formed; the inner cavities at the upper and lower ends of the pipette are respectively in a conical structure, the inner cavity at the upper end of the pipette is a conical structure that is small at the top and large at the bottom, and the inner cavity at the lower end of the pipette is a conical structure that is large at the top and small at the bottom; the connecting tube between the top airbag and the overflow storage tube is located at one side between the top airbag and the overflow storage tube, and an eccentric ventilation structure is formed between the lower end of the connecting tube and the upper end of the overflow storage tube, thereby reducing the probability of liquid directly rushing into the top airbag when the top airbag is squeezed with excessive force and then released.

2. The quantitative drinking straw according to claim 1, characterized in that: The liquid suction tube is an integrated structure; the outer side around the upper end of the liquid suction tube is sealed and fixed with the inner side around the lower end of the overflow storage tube.

3. The quantitative drinking straw according to claim 1, characterized in that: The suction tube is a separate structure; the suction tube includes an upper positioning tube and a lower disassembly tube; the upper end of the upper positioning tube is plugged and fixed inside the lower end of the overflow storage tube; the upper end of the lower disassembly tube is movably sleeved and connected to the lower end of the upper positioning tube.

4. The quantitative drinking straw according to claim 3, characterized in that: The outer side of the upper positioning tube is sealed and fixed to the inner side of the lower end of the overflow storage tube.

5. The quantitative drinking straw according to claim 3, characterized in that: The upper end of the lower disassembly tube is provided with a conical sleeve joint; the conical sleeve joint is a conical structure with a larger upper part and a smaller lower part; the upper end of the lower disassembly tube is movably sleeve-connected to the outer side around the lower end of the upper positioning tube through the conical sleeve joint.

6. The quantitative drinking straw according to any one of claims 1 to 5, characterized in that: Reinforcement strips are arranged on both sides of the connecting pipe; the upper and lower ends of the reinforcement strips are respectively connected between the top airbag and the overflow storage pipe.

7. The quantitative drinking straw according to any one of claims 1 to 5, characterized in that: The connecting tube, overflow storage tube and liquid pipette are made of glass or polymer material.

8. The quantitative drinking straw according to any one of claims 1 to 5, characterized in that: The top airbag is in a flat or ellipsoidal structure.

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