Novel pipette

Abstract

The utility model relates to a novel pipette. According to the technical scheme, an opening in the lower end of a liquid storage pipe is connected with a liquid taking pipe, a piston is slidably arranged in the liquid storage pipe, a through hole is formed in the middle of the piston, the upper end of the piston is fixedly connected with a push-pull pipe, a pipe opening in the upper end of the push-pull pipe is fixedly connected with a first push-pull lug, and a counter bore is rightwards formed in the inner wall of the right side of a central pipe opening of the first push-pull lug; a sliding groove is formed over the counter bore, a limiting pin is movably inserted into the inlet end of the counter bore, the upper side wall of the limiting pin is fixedly connected with a sliding block, the upper end of the sliding block extends out of the sliding groove, the right side wall of the limiting pin is fixedly connected with a spring fixing column, and the spring fixing column is fixedly sleeved with one end of a spring. A limiting hole is formed in the portion, corresponding to the counter bore, of the ejector rod. The liquid taking device has the advantages that the push rod can conveniently stretch into the liquid taking pipe to push out residual liquid in the liquid taking pipe, liquid taking accuracy is guaranteed, meanwhile, blockages in the liquid taking pipe can be pushed out, and the liquid taking pipe is prevented from being blocked.

Description

Technical Field

[0001] The utility model belongs to the field of pipettes and relates to a novel pipette. Background Art

[0002] A pipette is a measuring instrument used to accurately transfer a certain volume of solution. With the development of society and the improvement of medical level, people are more and more precise in controlling the amount of drugs. As a measuring instrument for measuring liquid volume, pipettes are widely used in current drug inspections. The end of the pipette is thinner. During use, if there are particulate impurities in the extract, it is easy to cause blockage. At the same time, when discharging liquid, the thinner end of the pipette can easily cause liquid to remain in the pipette due to the tension and adhesion of the liquid, thus affecting the accuracy of the pipette.

[0003] Therefore, the utility model provides a novel pipette to solve the above problems. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model discloses a novel pipette, the technical scheme adopted is that it comprises a liquid storage tube, the lower part of the liquid storage tube is conical, the lower end opening of the liquid storage tube is connected to the liquid extraction tube, a piston is slidably arranged inside the liquid storage tube, a through hole is provided in the middle of the piston, the upper end of the piston is fixedly connected to a push-pull tube, the upper end tube mouth of the push-pull tube is fixedly connected to a first push-pull ear, a countersunk hole is provided to the right on the right inner wall of the central tube mouth of the first push-pull ear, a sliding groove is provided directly above the countersunk hole, a limit pin is movably inserted into the inlet end of the countersunk hole, the upper side wall of the limit pin is fixedly connected to a sliding block, the upper end of the sliding block extends out of the sliding groove, the right side wall of the limit pin is fixedly connected to a spring fixing column, the spring fixing column is fixedly fitted with one end of the spring, a push rod is slidably inserted into the through hole and the push-pull tube, and a limit hole is provided at the position corresponding to the push rod and the countersunk hole.

[0005] As a preferred solution of the utility model, the outer side wall of the liquid storage tube is evenly scaled from bottom to top.

[0006] As a preferred solution of the utility model, the left and right sides of the upper end of the liquid storage tube are respectively fixedly connected to fixing ears.

[0007] As a preferred solution of the utility model, the inner diameters of the liquid collection tube, the through hole and the push-pull tube are equal to the diameter of the push rod; such a design makes it easy for the push rod to extend into the liquid collection tube and push out the residual liquid inside, thereby ensuring the accuracy of liquid collection. At the same time, the blockage in the liquid collection tube can be pushed out to avoid blockage of the liquid collection tube.

[0008] As a preferred solution of the utility model, the length of the push rod is greater than the sum of the lengths of the liquid storage tube and the liquid extraction tube; such a design can ensure that the push rod can be fully extended out of the tube mouth of the liquid extraction tube.

[0009] As a preferred solution of the utility model, the left and right sides of the upper end of the push rod are respectively fixedly connected to the second push-pull ears.

[0010] The beneficial effects of the utility model are as follows: a push rod that can be pushed and pulled up and down is arranged in the piston and the push-pull tube, and in cooperation with the limit pin, the spring fixing column and the spring arranged in the first push-pull ear, when taking liquid, the limit pin is inserted into the limit hole of the push rod to achieve the sealing of the through hole of the piston by the push rod, and after the liquid is taken and discharged from the lower end of the liquid storage tube, the limit pin is moved out of the limit hole by sliding the slider, and the push rod is pushed downward to push the residual liquid in the liquid collection tube out of the liquid collection tube, thereby improving the accuracy of pipetting to a certain extent. At the same time, during use, the push rod can be extended into the liquid collection tube to discharge the blockage inside it, thereby improving the convenience of using the pipette. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0012] Figure 2 It is a cross-sectional view of the overall structure of the utility model;

[0013] Figure 3 It is a schematic diagram of the piston of the utility model;

[0014] Figure 4 This is a schematic diagram of the assembly of the push-pull tube and the ejector rod of the utility model;

[0015] Figure 5 This is a cross-sectional view of the push-pull tube and the push rod of the utility model.

[0016] In the figure: 1-liquid storage tube, 2-piston, 3-push-pull tube, 4-elevator, 11-liquid extraction tube, 12-scale, 13-fixing ear, 21-through hole, 31-first push-pull ear, 32-counterbore, 33-slide groove, 34-limiting pin, 341-slider, 35-spring fixing column, 36-spring, 41-limiting hole, 42-second push-pull ear. DETAILED DESCRIPTION

[0017] Example 1

[0018] like Figures 1 to 5As shown, a new type of pipette described in the utility model adopts the technical solution of comprising a liquid storage tube 1, the lower part of the liquid storage tube 1 is conical, the lower end opening of the liquid storage tube 1 is connected to the liquid extraction tube 11, the outer wall of the liquid storage tube 1 is evenly provided with scales 12 from bottom to top, the left and right sides of the upper end tube opening of the liquid storage tube 1 are respectively fixedly connected to fixed ears 13, a piston 2 is slidably arranged inside the liquid storage tube 1, a through hole 21 is provided in the middle of the piston 2, the upper end of the piston 2 is fixedly connected to a push-pull tube 3, the upper end tube opening of the push-pull tube 3 is fixedly connected to a first push-pull ear 31, a countersunk hole 32 is provided to the right of the right inner wall of the central tube opening of the first push-pull ear 31, a slide groove 33 is provided directly above the countersunk hole 32, and the countersunk hole A limit pin 34 is movably inserted into the inlet end of 32, and the upper side wall of the limit pin 34 is fixedly connected to a slider 341, and the upper end of the slider 341 extends out of the slide groove 33. The right side wall of the limit pin 34 is fixedly connected to a spring fixing column 35, and the spring fixing column 35 is fixedly fitted with one end of the spring 36. A push rod 4 is slidably inserted into the through hole 21 and the push-pull tube 3, and the diameters of the push rod 4 are respectively equal to the inner diameters of the liquid collection tube 11, the through hole 21 and the push-pull tube 3, and the length of the push rod 4 is greater than the sum of the lengths of the liquid storage tube 1 and the liquid collection tube 11. A limit hole 41 is provided at the position corresponding to the push rod 4 and the counterbore 32, and the left and right sides of the upper end of the push rod 4 are respectively fixedly connected to the second push-pull ears 42.

[0019] The working principle of the utility model is as follows: when taking liquid, the liquid taking tube 11 at the lower end of the liquid storage tube 1 is extended into the liquid to be sampled, the first push-pull ear 31 of the tube opening at the upper end of the push-pull tube 3 is hooked with a finger and lifted upward, and the scale 12 on the outer wall of the liquid storage tube 1 is observed to be flush with the liquid surface to judge the amount of liquid taken. After the liquid is taken, when the liquid in the pipette needs to be discharged, the two sides of the first push-pull ear 31 are pressed downward to move the piston 2 to the bottom of the liquid storage tube 1, and the piston 2 discharges the liquid inside the liquid storage tube 1 through the liquid taking tube 11. After that, the slider 341 in the slide groove 33 is moved, and the slider 341 drives the limit pin 34 to compress the spring 36, so that the limit pin 34 is pulled out from the limit hole 41 of the push rod 4, and the position of the slider 341 is kept stationary, and the second push-pull ear 42 is pressed downward to slowly push the push rod 4 into the liquid taking tube 11, and a part of the liquid retained in the liquid taking tube 11 is pushed out of the liquid taking tube 11 through the push rod 4.

[0020] The electrical connection methods or structures not described in detail herein are prior art.

[0021] Although the specific embodiments of the present invention are described in detail above, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention, and modifications or deformations without creative labor are still within the scope of protection of the present invention.

Claims

1. A novel pipette, characterized in that: The invention comprises a liquid storage tube (1), the lower part of which is conical, the lower end opening of which is connected to a liquid extraction tube (11), a piston (2) is slidably arranged inside the liquid storage tube (1), a through hole (21) is provided in the middle of the piston (2), the upper end of the piston (2) is fixedly connected to a push-pull tube (3), the upper end of the push-pull tube (3) is fixedly connected to a first push-pull ear (31), a countersunk hole (32) is provided on the right inner wall of the central tube opening of the first push-pull ear (31), and a slide groove (33) is provided directly above the countersunk hole (32). ), a limit pin (34) is movably inserted at the inlet end of the counterbore (32), the upper side wall of the limit pin (34) is fixedly connected to a slider (341), the upper end of the slider (341) extends out of the slide groove (33), the right side wall of the limit pin (34) is fixedly connected to a spring fixing column (35), the spring fixing column (35) is fixedly sleeved with one end of a spring (36), a push rod (4) is slidably inserted into the through hole (21) and the push-pull tube (3), and a limit hole (41) is provided at a position corresponding to the push rod (4) and the counterbore (32).

2. A novel pipette according to claim 1, characterized in that: The outer wall of the liquid storage tube (1) is evenly provided with scale marks (12) from bottom to top.

3. A novel pipette according to claim 1, characterized in that: The left and right sides of the upper end of the liquid storage tube (1) are respectively fixedly connected to fixing ears (13).

4. A novel pipette according to claim 1, characterized in that: The inner diameters of the liquid extraction tube (11), the through hole (21) and the push-pull tube (3) are equal to the diameter of the push rod (4).

5. A novel pipette according to claim 1, characterized in that: The length of the push rod (4) is greater than the sum of the lengths of the liquid storage tube (1) and the liquid extraction tube (11).

6. A novel pipette according to claim 1, characterized in that: The left and right sides of the upper end of the push rod (4) are respectively fixedly connected to the second push-pull ears (42).

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