Pasteur pipette capable of preventing liquid from continuously flowing out

Abstract

The utility model discloses a Pasteur pipette capable of preventing liquid from continuously flowing out, which comprises a pipette body, one end of the pipette body is connected with a suction bubble, the other end of the pipette body is provided with a suction nozzle, a sealing clip comprises a connecting block, symmetrical clip bodies are arranged on two sides of the connecting block, each clip body comprises a connecting part, a clip handle is arranged at the upper end of each connecting part, and a clip arm is arranged at the lower end of each connecting part. A clamping head is arranged at the lower end of the clamping arm, the connecting block is arranged on the pipe body, the clamping handle corresponds to the suction bubble, and the clamping head corresponds to one end, close to the suction nozzle, of the pipe body. The sealing clamp is arranged outside the straw body, the clamping handle is pinched to extrude sucked bubbles, the two clamping heads are separated, liquid is sucked through the suction nozzle, the clamping handle is loosened after suction is completed, and under the action of the torsion spring, the two clamping heads reset to clamp the end, close to the suction nozzle, of the straw body. The problem that the liquid continuously flows out from the opening of the Pasteur pipette due to quick volatilization or low surface tension and the like is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of Pasteur pipettes, and particularly relates to a Pasteur pipette that can avoid continuous liquid outflow. Background Art

[0002] As a disposable consumable in laboratories, Pasteur pipettes are widely used in fields such as genetics, medicine, epidemic prevention, clinical practice, genetics, biochemistry, petrochemical industry, and military. Pasteur pipettes are generally made of plastic materials such as PP or PE.

[0003] When using a Pasteur pipette to aspirate highly volatile (such as ethanol or formaldehyde) or low-boiling-point liquids, due to the easy evaporation of these liquids when contacting air to form gas, the liquid volume decreases, forming a negative pressure. To balance this negative pressure, the liquid may flow out of the Pasteur pipette until a new equilibrium state is reached. In addition, liquids with low surface tension usually have good fluidity, and the binding between liquid surface molecules is weak. Therefore, in some cases, it may also cause the liquid to be more likely to fall off or flow away from the solid surface.

[0004] Therefore, after the Pasteur pipette aspirates liquids with these characteristics, the liquid will continuously flow out of the Pasteur pipette mouth until the liquid in the tube runs out, which is not conducive to liquid transfer and does not meet the biosafety specifications.

[0005] Therefore, there is an urgent need for a Pasteur pipette that can avoid continuous liquid outflow to solve the problem that the liquid will continuously flow out of the tube mouth due to rapid evaporation resulting in pressure difference or low surface tension after aspirating the liquid. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a Pasteur pipette that can avoid continuous liquid outflow to solve the problems raised in the above background art. A Pasteur pipette that can avoid continuous liquid outflow provided by the utility model has the characteristic of avoiding continuous outflow from the Pasteur pipette mouth due to reasons such as rapid liquid evaporation or low surface tension.

[0007] To achieve the above purpose, the utility model provides the following technical solution: A Pasteur pipette that can avoid continuous liquid outflow includes a pipette body and a sealing clip. Among them, the pipette body includes a tube body, one end of the tube body is connected with a suction bulb, and the other end of the tube body is provided with a suction nozzle. The sealing clip includes a connecting block, and symmetric clip bodies are provided on both sides of the connecting block. The clip body includes a connecting portion, the connecting portion is hinged to the connecting block, and the two connecting portions are also connected by a torsion spring. The upper end of the connecting portion is provided with a clip handle, the lower end of the connecting portion is provided with a clip arm, and the lower end of the clip arm is provided with a clip head. The connecting block is arranged on the tube body, the clip handle corresponds to the suction bulb, and the clip head corresponds to one end of the tube body close to the suction nozzle.

[0008] To enable the sealing clip to be recycled, further, the sealing clip is made of stainless steel.

[0009] For the tube body to pass through and to realize the connection between the straw body and the sealing clip, further, a through hole is provided at the middle position of the connecting block.

[0010] To achieve the limit connection with the connecting block, further, the through hole is of a flared structure.

[0011] To install the clip body, further, two symmetrical pin shafts are provided on the connecting block, the connecting part is hinged on the pin shafts, and the torsion spring is sleeved on the pin shafts.

[0012] To limit the tube body and facilitate the quick installation of the tube body to a set position, further, a convex ring is provided on the circumference of the tube body near the suction bubble end.

[0013] To facilitate the accurate addition of liquid, further, scale lines are provided on the circumference of the tube body.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model is provided with a sealing clip outside the straw body. By pinching the clip handle, the suction bubble can be squeezed, and at the same time, the two clip heads are separated, and the liquid is sucked through the suction nozzle. After the suction is completed, the clip handle is released, and under the action of the torsion spring, the two clip heads are reset to clamp one end of the tube body close to the suction nozzle, avoiding the contact between the liquid and the air, thereby solving the problem of continuous outflow of the liquid from the mouth of the Pasteur pipette.

[0016] 2. The sealing clip of the present utility model is made of stainless steel, so that the sealing clip can be recycled.

[0017] 3. The through hole of the present utility model is of a flared structure, and the tube body and the through hole are in interference fit to achieve the limit connection with the connecting block.

[0018] 4. The present utility model is provided with a convex ring on the circumference of the tube body near the suction bubble end, and the tube body is limited by the convex ring, which is convenient for quickly installing the tube body to a set position. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural view of the present utility model;

[0020] Figure 2 is a schematic structural view of the sealing clip of the present utility model;

[0021] Figure 3 is a top view structural schematic of the sealing clip of the present utility model;

[0022] Figure 4 is a cross-sectional structural schematic of the connecting block of the present utility model;

[0023] Figure 5This is a schematic structural diagram of the clip body of the present utility model;

[0024] Figure 6 This is a schematic structural diagram of the straw body of the present utility model;

[0025] Figure 7 This is a schematic diagram of the state when the straw body of the present utility model is installed;

[0026] Figure 8 This is a schematic diagram of the state when the present utility model sucks liquid;

[0027] In the figure: 1. Sealing clip; 2. Straw body; 21. Tube body; 22. Nozzle; 23. Scale line; 24. Convex ring; 25. Suction bubble; 26. Depressed part; 3. Connecting block; 31. Through hole; 32. Pin shaft; 4. Clip body; 41. Connecting part; 42. Clip handle; 43. Clip head; 44. Clip arm; 5. Torsion spring. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Embodiment 1

[0030] Please refer to Figure 1-8 , the present utility model provides the following technical solutions: A Pasteur pipette for preventing continuous outflow of liquid, including a straw body 2 and a sealing clip 1. Among them, the straw body 2 includes a tube body 21, one end of the tube body 21 is connected with a suction bubble 25, the other end of the tube body 21 is provided with a nozzle 22, the sealing clip 1 includes a connecting block 3, and symmetric clip bodies 4 are provided on both sides of the connecting block 3. The clip body 4 includes a connecting part 41, the connecting part 41 is hinged to the connecting block 3, and the two connecting parts 41 are also connected by a torsion spring 5. The upper end of the connecting part 41 is provided with a clip handle 42, the lower end of the connecting part 41 is provided with a clip arm 44, the lower end of the clip arm 44 is provided with a clip head 43, the connecting block 3 is arranged on the tube body 21, the clip handle 42 corresponds to the suction bubble 25, and the clip head 43 corresponds to one end of the tube body 21 close to the nozzle 22.

[0031] By adopting the above technical solution, a sealing clip 1 is arranged outside the straw body 2 of the utility model. Squeezing the clip handle 42 can squeeze the suction bubble 25, and at the same time, the two clip heads 43 are separated. The liquid is sucked through the suction nozzle 22. After the suction is completed, the clip handle 42 is released. Under the action of the torsion spring 5, the two clip heads 43 reset and clamp one end of the tube body 21 close to the suction nozzle 22 to prevent the liquid from contacting the air, thereby solving the problem of continuous outflow from the mouth of the Pasteur pipette due to reasons such as rapid evaporation of the liquid or low surface tension.

[0032] Specifically, a through hole 31 is provided at the middle position of the connecting block 3.

[0033] By adopting the above technical solution, it is used for the tube body 21 to pass through, realizing the connection between the straw body 2 and the sealing clip 1.

[0034] Specifically, two symmetrical pin shafts 32 are provided on the connecting block 3. The connecting portion 41 is hinged on the pin shaft 32, and the torsion spring 5 is sleeved on the pin shaft 32.

[0035] By adopting the above technical solution, it is used for installing the clip body 4.

[0036] Embodiment 2

[0037] The difference between this embodiment and Embodiment 1 is that: specifically, the sealing clip 1 is made of stainless steel.

[0038] By adopting the above technical solution, the sealing clip 1 can be recycled.

[0039] Embodiment 3

[0040] The difference between this embodiment and Embodiment 1 is that: specifically, the through hole 31 is of a flared structure, the inner diameter of the upper end of the through hole 31 is larger than that of the lower end, and the inner diameter of the lower end of the through hole 31 is slightly smaller than the outer diameter of the tube body 21.

[0041] By adopting the above technical solution, the tube body 21 and the through hole 31 are in interference fit to realize the limit connection with the connecting block 3.

[0042] Specifically, a convex ring 24 is provided on the circumference of the tube body 21 near the suction bubble 25.

[0043] By adopting the above technical solution, the tube body 21 is limited by the convex ring 24, which is convenient for quickly installing the tube body 21 to the set position.

[0044] Embodiment 4

[0045] The difference between this embodiment and Embodiment 1 is that: specifically, scale lines 23 are provided on the circumference of the tube body 21.

[0046] By adopting the above technical solution, it is convenient to accurately add liquid.

[0047] Example 5

[0048] The difference between this embodiment and Embodiment 1 lies in that: specifically, a recessed portion 26 corresponding to the chuck 43 is provided at the lower end of the tube body 21.

[0049] By adopting the above technical solution, the clamping effect of the chuck 43 can be improved, and the possibility of liquid contacting air can be reduced. At the same time, the inner diameter of the nozzle 22 is the same as that of the tube body 21, so that the liquid below the clamping portion can flow out quickly after the liquid is sucked, reducing waste.

[0050] To sum up, a sealing clip 1 is provided outside the straw body 2 of the present utility model. Squeezing the clip handle 42 can squeeze the suction bubble 25, and at the same time, the two chucks 43 are separated, and the liquid is sucked through the nozzle 22. After the suction is completed, the clip handle 42 is released. Under the action of the torsion spring 5, the two chucks 43 are reset to clamp one end of the tube body 21 close to the nozzle 22, avoiding the contact between the liquid and the air, thereby solving the problem of continuous outflow from the mouth of the Pasteur pipette due to reasons such as rapid evaporation of the liquid or low surface tension; the sealing clip 1 of the present utility model is made of stainless steel, so that the sealing clip 1 can be recycled; the through hole 31 of the present utility model is of a flared structure, and the tube body 21 and the through hole 31 are in interference fit to realize the limit connection with the connecting block 3; a convex ring 24 is provided on the circumference of one end of the tube body 21 close to the suction bubble 25, and the tube body 21 is limited by the convex ring 24, which is convenient for quickly installing the tube body 21 to a set position.

[0051] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A Pasteur pipette for preventing continuous outflow of liquid, characterized in that: It includes a straw body and a sealing clip, wherein the straw body includes a tube body, one end of the tube body is connected to a suction bubble, and the other end of the tube body is provided with a suction nozzle, the sealing clip includes a connecting block, and symmetrical clamping bodies are provided on both sides of the connecting block, the clamping body includes a connecting part, the connecting part is hinged to the connecting block, and the two connecting parts are also connected by a torsion spring, the upper end of the connecting part is provided with a clamping handle, the lower end of the connecting part is provided with a clamping arm, and the lower end of the clamping arm is provided with a clamping head, the connecting block is arranged on the tube body, the clamping handle corresponds to the suction bubble, and the clamping head corresponds to one end of the tube body close to the suction nozzle.

2. A Pasteur pipette for preventing continuous outflow of liquid according to claim 1, characterized in that: The sealing clip is made of stainless steel.

3. A Pasteur pipette for preventing continuous outflow of liquid according to claim 1, characterized in that: A through hole is provided in the middle of the connecting block.

4. A Pasteur pipette for preventing continuous outflow of liquid according to claim 3, characterized in that: The through hole is a trumpet-shaped structure.

5. The Pasteur pipette for preventing continuous outflow of liquid according to claim 1, characterized in that: The connecting block is provided with two symmetrical pins, the connecting part is hinged on the pins, and the torsion spring is sleeved on the pins.

6. A Pasteur pipette for preventing continuous outflow of liquid according to claim 1, characterized in that: A convex ring is arranged on the circumference of one end of the tube body close to the suction bubble.

7. A Pasteur pipette for preventing continuous outflow of liquid according to claim 1, characterized in that: Scale lines are arranged on the circumference of the tube body.

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