A filter cartridge spigot

Abstract

The utility model relates to experimental apparatus technical field, concretely relates to a filter core suction head, including the suction head body, the filter core and the anti -overflow mechanism of setting in the suction head body, the upper end of suction head body is provided with the connecting portion connected with the pipettor, the anti -overflow mechanism includes the valve seat sealedly connected with the inner wall of suction head body, the through -hole no.1 of penetrating valve seat, the through -hole no.2 of penetrating the slide -in -one of the elastic connection for plugging through -hole no.1 with valve seat, and the slide -in -two of the elastic connection for plugging through -hole no.2 with slide -in -one, when pipettor absorbs liquid, the clearance between slide -in -one and through -hole no.1 produces liquid and enters the inner chamber of the suction head body above valve seat, when pipettor extrudes the liquid in the suction head body, the clearance between slide -in -two and through -hole no.2 produces liquid sample and flows out to the suction head body outside. The present scheme is simple in structure, and it is more convenient to manufacture and install, and the phenomenon of liquid in the suction head outside dripping overflow can not occur in the process of pipettor after absorbing liquid and shifting to the target container.

Description

Technical Field

[0001] This utility model relates to the field of experimental equipment technology, specifically to a filter cartridge suction tip. Background Technology

[0002] Pipettes are consumables used with pipettes. Primarily made of medical-grade polypropylene, pipette tips are used in conjunction with pipettes to aspirate or displace liquid samples, completing the liquid transfer process. They are widely used in medical research, biological research, and chemical laboratories. In laboratories, automated pipettes are typically used with cartridge-type pipette tips to transfer and store various liquid samples. The filter cartridge in the cartridge-type pipette tip is air-permeable but liquid-impermeable, preventing sample liquid from flowing into the pipette and mitigating the risk of cross-contamination when pipetting different liquid samples.

[0003] However, some existing large-diameter filter cartridge tips are prone to liquid spillage during the transfer of liquid to the target container after aspiration. To prevent this spillage, prior art CN217450227 U discloses an anti-overflow filter cartridge tip. This solution incorporates a retainer, bevel gear set, lead screw, and other structures within the tip, and a handle extending radially through the tip. Rotating the handle controls the movement of a piston within the tip, thus controlling the opening and closing of the aspiration channel. While this solution effectively addresses the spillage issue, its complex structure makes manufacturing and installation difficult, and its practical application makes preventing spillage quite cumbersome. Utility Model Content

[0004] The purpose of this utility model is to provide a filter cartridge suction head that is simple in structure, easy to install, and easy to operate, so as to solve the problems mentioned in the above technical background that the existing filter cartridge suction heads have complex structures, are difficult to manufacture and install, and are relatively troublesome in actual operation.

[0005] To solve the above-mentioned technical problems, the basic solution adopted by this utility model is: a filter cartridge pipette tip, comprising a tubular pipette tip body, a filter cartridge disposed in the upper inner cavity of the pipette tip body, and an anti-overflow mechanism disposed in the lower inner cavity of the pipette tip body. The upper end of the pipette tip body is provided with a connecting part for connecting to a pipette, and the lower end of the pipette tip body is configured as a conical adsorption end. The anti-overflow mechanism includes a valve seat that is sealed to the inner wall of the pipette tip body, a through hole extending through the valve seat along the length direction of the pipette tip body, and a connection to the filter cartridge. The valve seat is elastically connected to a sliding column one for sealing the through hole one, a through hole two that passes through the sliding column one along the length direction of the pipette tip body, and a sliding column two that is elastically connected to the sliding column one for sealing the through hole two. When the pipette generates negative pressure to draw liquid samples, a gap is created between the sliding column one and the through hole, allowing the liquid sample to enter the inner cavity of the pipette tip body above the valve seat. When the pipette generates positive pressure to squeeze the liquid sample inside the pipette tip body, a gap is created between the sliding column two and the through hole two, allowing the liquid sample to flow out to the outside of the pipette tip body.

[0006] Furthermore, the first through hole is an inverted conical hole, the first sliding column is an inverted conical column that mates with the first through hole, and the upper end face of the first sliding column is evenly distributed with multiple elastic bands in a ring around the axis of the first sliding column. One end of the elastic band is fixedly connected to the upper end face of the first sliding column, and the other end of the elastic band is fixedly connected to the upper end of the valve seat.

[0007] Furthermore, the upper end face of the first slide is flush with the upper end face of the valve seat, and the first elastic band is in a flat, relaxed state. The first elastic band is in a relaxed state to reduce the resistance when the pipette pushes the first slide to move and perform liquid aspiration.

[0008] Furthermore, the second through hole is a conical hole, the second sliding column is a conical column that mates with the second through hole, and the lower end face of the second sliding column is evenly distributed with multiple elastic bands 2 in a ring around the axis of the second sliding column. One end of the elastic band 2 is fixedly connected to the lower end face of the second sliding column, and the other end of the elastic band 2 is fixedly connected to the lower end face of the first sliding column.

[0009] Furthermore, the lower end of the second slide column extends downward beyond the first slide column, and the second elastic band is in a tensioned state to generate an upward preload force on the second slide column. This preload force is greater than the pressure generated by the weight of the liquid sample inside the suction head body on the second slide column.

[0010] Furthermore, both the first elastic band and the second elastic band are components made of elastic rubber.

[0011] Furthermore, the valve seat includes a seat body and a second rubber layer disposed on the outer wall of the seat body. The second rubber layer increases the friction between the valve seat and the inner wall of the suction head body, which helps to improve the sealing performance and stability of the valve seat when it is engaged with the inner wall of the suction head body.

[0012] Furthermore, the filter element is a double-layer filter element, with a rubber layer on the outer wall of the filter element to increase the friction between the filter element and the inner wall of the suction head body. The rubber layer increases the friction between the filter element and the inner wall of the suction head body, which helps to improve the sealing and stability of the filter element when it is attached to the inner wall of the suction head body.

[0013] Compared with existing technologies, the filter cartridge nozzle of this solution has at least the following beneficial effects: This design features a simple structure, making manufacturing and installation easier. After the pipette completes liquid aspiration, the elastic sliding column two, along with the elastic band two, blocks the through-hole two, preventing liquid from dripping out of the pipette tip during transfer to the target container. When the pipette discharges liquid, no other operations are required. Under the discharge pressure, the sliding column two overcomes the elastic band two and moves downwards, creating a gap between the sliding column two and the inner wall of the through-hole two, forming a discharge channel. The operation is simple. Attached Figure Description

[0014] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of a filter cartridge suction head according to the present invention.

[0015] Figure 2 for Figure 1 Sectional view of AA.

[0016] Figure 3 for Figure 1 Enlarged view of section A.

[0017] Figure 4 This is a schematic diagram of the valve seat structure when the pipette is drawing liquid.

[0018] Figure 5 This is a schematic diagram of the valve seat structure when the pipette is dispensing liquid.

[0019] The meanings of the labels in the attached diagram are as follows: suction head body - 10; connecting part - 101; conical suction end - 102; Filter element-20; Valve seat-30; seat body-301; rubber layer two-302; Through hole 1-31; sliding column 1-32; through hole 2-33; sliding column 2-34; elastic band 1-35; elastic band 2-36. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0022] One type of filter cartridge suction head in this embodiment, such as Figures 1-5 As shown, it includes a suction head body 10, a filter element 20 disposed in the upper inner cavity of the suction head body 10, and an anti-overflow mechanism disposed in the lower inner cavity of the suction head body 10.

[0023] The pipette tip body 10 is made of medical-grade polypropylene. The pipette tip body 10 is a vertically arranged circular tube. The upper end of the pipette tip body 10 is provided with a connecting part 101 for connecting with a pipette. The pipette tip body 10 is sealed and plugged into or snapped into the adsorption port of the pipette through the connecting part 101. The lower end of the pipette tip body 10 is provided with a conical adsorption end 102.

[0024] The filter element 20 is a double-layer filter element. The outer wall of the filter element 20 is provided with a rubber layer 1 to increase the friction between the filter element 20 and the inner wall of the suction head body 10. The rubber layer 1 increases the friction between the filter element 20 and the inner wall of the suction head body 10, which is beneficial to improving the sealing and stability of the filter element 20 when it is stuck on the inner wall of the suction head body 10.

[0025] The anti-overflow mechanism includes a valve seat 30 sealed to the inner wall of the suction head body 10, a through hole 31 extending through the valve seat 30 along the length of the suction head body 10, a slide bar 32 elastically connected to the valve seat 30 for sealing the through hole 31, a through hole 33 extending through the slide bar 32 along the length of the suction head body 10, and a slide bar 34 elastically connected to the slide bar 32 for sealing the through hole 33. Figures 1-3 As shown, the valve seat 30 includes a cylindrical seat body 301 and a second rubber layer 302 fixed on the outer wall of the seat body 301. The second rubber layer 302 increases the friction between the valve seat 30 and the inner wall of the suction head body 10, which helps to improve the sealing and stability of the valve seat 30 when it is stuck on the inner wall of the suction head body 10.

[0026] The through hole 31 is an inverted conical hole, and the slide column 32 is an inverted conical column that mates with the through hole 31. The upper end face of the slide column 32 is flush with the upper end face of the valve seat 30. Multiple elastic bands 35 are evenly distributed in a ring around the axis of the slide column 32 on the upper end face. In this embodiment, four elastic bands 35 are evenly distributed in a ring around the axis of the slide column 32 on the upper end face. In other feasible embodiments, there can be six, eight, or other numbers of elastic bands 35. The elastic bands 35 are made of elastic rubber. One end of the elastic band 35 is fixedly connected to the upper end face of the slide column 32, and the other end of the elastic band 35 is fixedly connected to the upper end of the valve seat 30. The elastic bands 35 are in a flat and relaxed state to reduce the resistance when the pipette pushes the slide column 32 to move for liquid aspiration. The second through hole 33 is a conical hole, and the second slide column 34 is a conical column that mates with the second through hole 33. Multiple elastic bands 36 are evenly distributed in a ring around the axis of the second slide column 34 on its lower end face. In this embodiment, corresponding to the first elastic band 35, four elastic bands 36 are evenly distributed in a ring around the axis of the second slide column 34 on its lower end face. In other feasible embodiments, six, eight, or other numbers of elastic bands 36 can be used. The elastic bands 36 are made of elastic rubber. One end of the elastic band 36 is fixedly connected to the lower end face of the second slide column 34, and the other end is fixedly connected to the lower end face of the first slide column 32. The lower end of the second slide column 34 extends downward beyond the first slide column 32. The elastic bands 36 are in a tensioned state to generate an upward preload force on the second slide column 34. This preload force is greater than the pressure exerted on the second slide column 34 by the weight of the liquid sample inside the suction head body 10.

[0027] In this design, the pipette tip body 10 is connected to the pipette. When the operation causes the pipette to generate negative pressure to aspirate a liquid sample, such as... Figure 4 As shown, under negative pressure, the sliding column 32 moves upward against the elastic force of the elastic band 35, creating a gap between the sliding column 32 and the through hole 31 to form a liquid inlet channel. The liquid sample enters the inner cavity of the pipette head body 10 above the valve seat 30 through this inlet channel. After aspiration, under the elastic force of the elastic band 35 and the gravity of the liquid, the sliding column 32 moves downward and fits against the through hole 31, sealing the through hole 31. At this time, under the elastic force of the elastic band 36, the sliding column 34 cannot move downward, and the liquid above the valve seat 30 cannot flow out through the through hole 33. When the operation generates positive pressure in the pipette to squeeze the liquid sample in the pipette head body 10 for drainage, as... Figure 5 As shown, the downward pressure on the second slide column 34 increases, and the second slide column 34 moves downward against the elastic force of the second sandalwood strip, so that a gap is formed between the second slide column 34 and the second through hole 33 to form a drainage channel. The liquid sample above the valve seat 30 is squeezed out into the target container outside the suction head body 10 through the drainage channel.

[0028] The above are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A filter cartridge pipette tip, comprising a tubular pipette tip body (10) and a filter cartridge (20) disposed in the upper inner cavity of the pipette tip body (10), wherein the upper end of the pipette tip body (10) is provided with a connecting part (101) for connecting to a pipette, and the lower end of the pipette tip body (10) is provided with a conical adsorption end (102), characterized in that: It also includes an overflow prevention mechanism disposed in the lower end cavity of the suction head body (10). The overflow prevention mechanism includes a valve seat (30) that is sealed to the inner wall of the suction head body (10), a through hole (31) extending through the valve seat (30) along the length direction of the suction head body (10), a slide (32) elastically connected to the valve seat (30) for sealing the through hole (31), and a through hole (33) extending through the slide (32) along the length direction of the suction head body (10). The slide column 2 (34) is elastically connected to the slide column 1 (32) to block the through hole 2 (33). When the pipette generates negative pressure to draw liquid samples, a gap is created between the slide column 1 (32) and the through hole 1 (31) to allow the liquid sample to enter the inner cavity of the pipette head body (10) above the valve seat (30). When the pipette generates positive pressure to squeeze the liquid sample in the pipette head body (10), a gap is created between the slide column 2 (34) and the through hole 2 (33) to allow the liquid sample to flow out to the outside of the pipette head body (10).

2. The filter cartridge suction head according to claim 1, characterized in that: The through hole (31) is an inverted conical hole, and the sliding column (32) is an inverted conical column that cooperates with the through hole (31). Multiple elastic bands (35) are evenly distributed around the axis of the sliding column (32) on the upper end face. One end of the elastic band (35) is fixedly connected to the upper end face of the sliding column (32), and the other end of the elastic band (35) is fixedly connected to the upper end of the valve seat (30).

3. The filter cartridge suction head according to claim 2, characterized in that: The upper end face of the slide bar (32) is flush with the upper end face of the valve seat (30), and the elastic band (35) is in a flat and relaxed state.

4. The filter cartridge suction head according to claim 3, characterized in that: The second through hole (33) is a conical hole, and the second sliding column (34) is a conical column that cooperates with the second through hole (33). The lower end face of the second sliding column (34) is evenly distributed with multiple elastic bands (36) in a ring around the axis of the second sliding column (34). One end of the elastic band (36) is fixedly connected to the lower end face of the second sliding column (34), and the other end of the elastic band (36) is fixedly connected to the lower end face of the first sliding column (32).

5. The filter cartridge suction head according to claim 4, characterized in that: The lower end of the second slide (34) extends downward beyond the first slide (32), and the second elastic band (36) is in a tensioned state to generate an upward preload force on the second slide (34). This preload force is greater than the pressure generated by the weight of the liquid sample in the suction head body (10) on the second slide (34).

6. The filter cartridge suction head according to claim 5, characterized in that: Both the first elastic band (35) and the second elastic band (36) are made of elastic rubber.

7. The filter cartridge suction head according to claim 1, characterized in that: The valve seat (30) includes a seat body (301) and a second rubber layer (302) disposed on the outer wall of the seat body (301).

8. The filter cartridge suction head according to claim 1, characterized in that: The filter element (20) is a double-layer filter element. The outer wall of the filter element (20) is provided with a rubber layer to increase the friction between the filter element (20) and the inner wall of the suction head body (10).

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