Full-suction-preventing device of electric pipette

Abstract

The invention relates to the technical field of electric pipettes, and discloses an anti-full-suction device for an electric pipette, which comprises a pipette body, an end tube is arranged on the pipette body, an adapter tube and a pipette head are sequentially in threaded connection with the lower part of the end tube, a liquid return tube is mounted on the side surface of the adapter tube in a communicating manner, and the adapter tube comprises a tube body; the pipe body is in threaded connection with the end pipe and the pipetting head, a first piston part is movably connected in the pipe body, a reset part is movably inserted in the middle of the first piston part, the reset part is sleeved with a first reset spring, the first reset spring is arranged between the reset part and the first piston part, and a first fixing part is fixedly installed in the end pipe; a second fixing piece is fixedly installed in the liquid return pipe, and a second piston piece is movably connected to the second fixing piece in an inserted mode. According to the invention, excessive adsorption liquid can be prevented from entering the pipette to damage the pipette; and moreover, the movement amount of the piston piece I is adjusted according to the requirement of the adsorption reagent amount, so that the application range of the electric pipette is further widened.

Description

Technical Field

[0001] The present invention relates to the technical field of electric pipettes, and specifically to an anti-overfilling device for electric pipettes. Background Art

[0002] In the research and production in the fields of biology, chemistry, medicine, scientific research, etc., the precise transfer of liquids is a basic operation. To manually complete the operation of precise pipetting, the main tool used in the industry is a manual pipette. With the development of technology, more and more fields in the market are starting to use electric pipettes. Electric pipettes have advantages such as precise pipetting and rich functions compared to manual pipettes. Therefore, with the industrial upgrade, electric pipettes will have more and more applications.

[0003] When using an electric pipette in an experiment, due to the continuous suction principle of the electric pipette, sometimes carelessly, the reagent is overfilled. After the liquid is inhaled into the pipette, it is easy to cause damage inside the pipette, making it unable to continue to be used normally, affecting the experimental process. Moreover, for existing electric pipettes, it is difficult to adjust according to the inhalation volume, resulting in a narrow application range of the electric pipette. In view of this, we propose an anti-overfilling device for electric pipettes. Summary of the Invention

[0004] The purpose of the present invention is to provide an anti-overfilling device for electric pipettes to solve the problems mentioned in the above background art, that is, for existing electric pipettes, due to the continuous suction principle of the electric pipette, sometimes carelessly, the reagent is overfilled. After the liquid is inhaled into the pipette, it is easy to cause damage inside the pipette, making it unable to continue to be used normally, affecting the experimental process. Moreover, for existing electric pipettes, it is difficult to adjust according to the inhalation volume, resulting in a narrow application range of the electric pipette.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An anti-overfilling device for an electric pipette, including a pipette body, a tip tube is arranged on the pipette body, a connecting tube and a pipette tip are sequentially threadedly connected below the tip tube, a return tube is connected and installed on the side of the connecting tube, the connecting tube includes a tube body, the tube body is threadedly connected to the tip tube and the pipette tip, a piston member I is movably connected inside the tube body, a sealing ring is embedded on the upper end surface of the piston member I, a reset member is movably inserted in the middle of the piston member I, a first reset spring is sleeved on the reset member, and the first reset spring is arranged between the reset member and the piston member I. A first fixing member is fixedly installed inside the tip tube, and the first fixing member is movably inserted into the piston member I;

[0006] A second fixing member is fixedly installed inside the return tube, a piston member II is movably inserted on the second fixing member, a second reset spring is movably sleeved on the piston member II, and the second reset spring is arranged between the piston member II and the second fixing member. The lower end of the return tube is connected and fixedly installed with a liquid outlet tube, and a liquid collection bag is arranged at the lower end of the liquid outlet tube.

[0007] Preferably, a first piston member and an upper reset member are respectively and fixedly installed on the upper and lower sides of the first reset spring.

[0008] Preferably, the center lines of the end head tube, the adapter tube and the pipette tip are collinear, and the end head tube, the adapter tube and the pipette tip are internally connected.

[0009] Preferably, the center lines of the tube body and the liquid return tube are perpendicular to each other, and the tube body and the liquid return tube are internally connected.

[0010] Preferably, the center lines of the liquid outlet tube and the liquid return tube are perpendicular to each other, and the liquid outlet tube and the liquid return tube are internally connected.

[0011] Preferably, an embedded opening is formed at the lower end of the end head tube, and the sealing ring is movably connected inside the embedded opening.

[0012] Preferably, the outer diameters of the first piston member and the reset member are equal to the inner diameter of the tube body, and the first piston member and the reset member are both arranged inside the tube body.

[0013] Preferably, a plurality of mesh holes are formed in the first fixing member, and the outer diameter of the first fixing member is equal to the inner diameter of the end head tube.

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

[0015] 1. For this anti-overfilling device of the electric pipette, when the reagent suction amount is close to completion, there will be a small amount of excessive reagent suction. At this time, the first fixing member abuts against the reset member, causing the first reset spring to stretch. The reset member can push the first piston member to move inside the liquid return tube to the side away from the adapter tube. At this time, the excess reagent liquid can enter the liquid outlet tube, further preventing the excess adsorbed liquid from entering the electric pipette and damaging the electric pipette.

[0016] 2. For this anti-overfilling device of the electric pipette, the end head tube, the adapter tube and the pipette tip are sequentially connected by means of threads. After rotating the adapter tube, the distance between the end head tube and the adapter tube can be increased, and thus the movement amount of the first piston member can be adjusted according to the required amount of adsorbed reagent, further improving the application range of the electric pipette and being worthy of popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the present invention;

[0018] Figure 2 is a schematic connection diagram of the end head tube, the adapter tube and the pipette tip of the present invention;

[0019] Figure 3 is for the present invention Figure 2 cross-sectional schematic diagram;

[0020] Figure 4 Schematic diagram of the initial liquid suction state of the present invention;

[0021] Figure 5 Schematic diagram of the state during inhalation of the present invention;

[0022] Figure 6 Schematic diagram of the stretching state of the first reset spring of the present invention;

[0023] Figure 7 Schematic diagram of the compressed state of the second reset spring of the present invention.

[0024] In the figure: 1. Pipette gun body; 2. End tube; 21. First fixing part; 22. Embedded port; 3. Adapter tube; 31. Tube body; 32. Liquid return tube; 33. Liquid outlet tube; 34. Liquid collection bag; 35. Second fixing part; 36. Second piston part; 37. Second reset spring; 38. First piston part; 381. Reset part; 382. Sealing ring; 39. First reset spring; 4. Pipette tip. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment: Please refer to Figure 1-7 , the present invention provides a technical solution: an anti-overfilling device for an electric pipette, mainly aiming at the existing electric pipette. Due to the continuous suction principle of the electric pipette, sometimes without attention, the reagent is overfilled. After the liquid is inhaled into the pipette, it is easy to cause damage inside the pipette, making it impossible to continue normal use and affecting the experimental process. Moreover, for the existing electric pipette, it is difficult to adjust according to the inhalation volume, resulting in a narrow application range of the electric pipette. The specific solution is as follows: It includes a pipette gun body 1. Among them, the pipette in the present invention is an electric pipette.

[0027] Please refer to Figure 1 , among which, an end tube 2 is arranged on the pipette gun body 1. A transfer tube 3 and a pipette tip 4 are sequentially threadedly connected below the end tube 2. A scale is arranged on the outer side of the transfer tube 3, and the transfer tube 3 is made of a transparent material. The end tube 2, the transfer tube 3, and the pipette tip 4 are collinear at the center, and the end tube 2, the transfer tube 3, and the pipette tip 4 are internally connected.

[0028] Please refer to Figure 2 and Figure 3, wherein the side of the transfer tube 3 is connected and installed with a return pipe 32, the center lines of the tube body 31 and the return pipe 32 are perpendicular to each other, and the tube body 31 and the return pipe 32 are internally connected. The transfer tube 3 includes a tube body 31, and the tube body 31 and the end tube 2 and the pipette head 4 are all connected by threads. The inside of the tube body 31 is movably connected with a piston member 38, and the upper end surface of the piston member 38 is embedded with a sealing ring 382, ​​wherein the cross section of the sealing ring 382 is circular, and the material of the sealing ring 382 is flexible rubber. In actual use, the elasticity of the sealing ring 382 can further prevent the liquid from penetrating into the inside of the pipette gun body 1.

[0029] Furthermore, a reset member 381 is movably inserted in the middle of the piston member 38, and the outer diameters of the piston member 38 and the reset member 381 are equal to the inner diameter of the tube body 31, and the piston member 38 and the reset member 381 are both arranged inside the tube body 31. A reset spring 39 is sleeved on the reset member 381, and the upper and lower sides of the reset spring 39 are fixedly installed on the piston member 38 and the reset member 381 respectively. The reset spring 39 is arranged between the reset member 381 and the piston member 38. Through the arrangement of the reset spring 39, the distance between the reset member 381 and the piston member 38 can be minimized in the initial state. When the reset member 381 is moved downward by an external force, the distance between the reset member 381 and the piston member 38 can be increased, so that the reset spring 39 can be stretched.

[0030] Furthermore, a fixing part 21 is fixedly installed inside the end tube 2, and the fixing part 21 is movably inserted into the piston part 38; a plurality of mesh holes are provided on the fixing part 21, and the outer diameter of the fixing part 21 is equal to the inner diameter of the end tube 2. It is worth noting that the mesh holes will not affect the electric pipette driving the piston part 38 to reciprocate up and down inside the tube body 31.

[0031] See also Figure 3 , wherein a second fixing part 35 is fixedly installed inside the liquid return pipe 32, a second piston part 36 is movably inserted on the second fixing part 35, a second return spring 37 is movably sleeved on the second piston part 36, and the second return spring 37 is arranged between the second piston part 36 and the second fixing part 35. The arrangement of the second return spring 37 can make the second piston part 36 in the initial state, such as Figure 4-6 Status shown.

[0032] Furthermore, a liquid outlet pipe 33 is connected and fixedly installed at the lower end of the liquid return pipe 32, and a liquid collecting bag 34 is provided at the lower end of the liquid outlet pipe 33. The liquid collecting bag 34 is a balloon-shaped bag, and the liquid collecting bag 34 can facilitate the discharge of the liquid entering the liquid outlet pipe 33. The center lines of the liquid outlet pipe 33 and the liquid return pipe 32 are perpendicular to each other, and the liquid outlet pipe 33 and the liquid return pipe 32 are connected to each other.

[0033] In this embodiment, an embedded port 22 is provided at the lower end of the end tube 2, and the sealing ring 382 is movably connected inside the embedded port 22. When the first piston member 38 is at the uppermost position, at this time, the sealing ring 382 is snapped into the embedded port 22, which can further improve the anti-leakage performance of the pipette.

[0034] Working principle: For this anti-overfilling device of the electric pipette, during use, when the reagent inhaled exceeds the maximum volume of the pipette tube (i.e., the maximum capacity of the pipette tip 4 and the adapter tube 3 in the present invention), the reagent enters the pipette in sequence from the pipette tip 4, the adapter tube 3, and the end tube 2. During this process, the first piston member 38 moves upward in the adapter tube 3. Through the connection of the first return spring 39, at this time, the reset member 381 moves with the first piston member 38. As the first piston member 38 moves, the reagent can be inhaled into the pipette; after the sealing ring 382 on the first piston member 38 is snapped into the embedded port 22 on the end tube 2, the inhalation of the quantitative reagent is completed; when the inhalation of the reagent is nearly completed, there will be a small amount of excessive inhalation of the reagent. At this time, the first fixing member 21 abuts against the reset member 381, causing the first return spring 39 to stretch. The reset member 381 can push the second piston member 36 to move away from the adapter tube 3 inside the liquid return tube 32. At this time, the excess reagent liquid can enter the liquid outlet tube 33, further preventing the excess adsorbed liquid from entering the pipette, playing a role of automatic pressure relief.

[0035] Although the embodiments of the present invention 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 principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-full suction device for an electric pipette, comprising a pipette body (1), wherein the pipette body (1) is provided with a terminal tube (2), wherein a transfer tube (3) and a pipette head (4) are threadedly connected in sequence below the terminal tube (2), and a liquid return tube (32) is connected and installed on the side of the transfer tube (3), characterized in that: The transfer tube (3) comprises a tube body (31), the tube body (31) and the end tube (2) and the pipetting head (4) are all connected by threads, a piston member (38) is movably connected inside the tube body (31), a sealing ring (382) is embedded in the upper end surface of the piston member (38), a reset member (381) is movably inserted in the middle of the piston member (38), a reset spring (39) is sleeved on the reset member (381), and the reset spring (39) is arranged between the reset member (381) and the piston member (38), a fixing member (21) is fixedly installed inside the end tube (2), and the fixing member (21) is movably inserted in the piston member (38); A second fixing part (35) is fixedly installed inside the liquid return pipe (32), a second piston part (36) is movably inserted into the second fixing part (35), a second return spring (37) is movably sleeved on the second piston part (36), and the second return spring (37) is arranged between the second piston part (36) and the second fixing part (35). The lower end of the liquid return pipe (32) is connected to and fixedly installed with a liquid outlet pipe (33), and a liquid collecting bag (34) is arranged at the lower end of the liquid outlet pipe (33).

2. The anti-full device for an electric pipette according to claim 1, characterized in that: The upper and lower sides of the return spring 1 (39) are respectively fixedly mounted on the piston member 1 (38) and the return member (381).

3. The anti-full suction device for an electric pipette according to claim 1, characterized in that: The centers of the terminal tube (2), the transfer tube (3) and the transfer head (4) are collinear, and the terminal tube (2), the transfer tube (3) and the transfer head (4) are internally connected.

4. The anti-full suction device for an electric pipette according to claim 1, characterized in that: The center lines of the tube body (31) and the liquid return pipe (32) are perpendicular to each other, and the insides of the tube body (31) and the liquid return pipe (32) are connected.

5. The anti-full suction device for an electric pipette according to claim 1, characterized in that: The center lines of the liquid outlet pipe (33) and the liquid return pipe (32) are perpendicular to each other, and the insides of the liquid outlet pipe (33) and the liquid return pipe (32) are connected.

6. The anti-full suction device for an electric pipette according to claim 1, characterized in that: The lower end of the terminal tube (2) is provided with an embedded opening (22), and the sealing ring (382) is movably connected to the inside of the embedded opening (22).

7. The anti-full device for an electric pipette according to claim 1, characterized in that: The outer diameters of the piston member 1 (38) and the reset member (381) are equal to the inner diameter of the tube body (31), and the piston member 1 (38) and the reset member (381) are both arranged inside the tube body (31).

8. The anti-full suction device for an electric pipette according to claim 1, characterized in that: The fixing member 1 (21) is provided with a plurality of mesh holes, and the outer diameter of the fixing member 1 (21) is equal to the inner diameter of the end tube (2).

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