Suction head device for pipettor

Abstract

The utility model discloses a suction head device for a pipettor, which comprises a pipette connected with a main body of the pipettor; the suction head is connected with the end part, far away from the pipettor main body, of the pipette and is connected with the gun tip in an inserting manner; the fixing assembly comprises a supporting piece arranged on the inner wall of the pipette; the adjusting assembly comprises a movable part rotationally arranged on the supporting part and an adjusting part which extends outwards along the movable part and penetrates through the liquid suction pipe, and the movable part is in threaded connection with the suction head; wherein the movable part is configured to be capable of driving the suction head to rotate relative to the pipette when the adjusting part is twisted, so that the suction head is inserted into the gun tip to form sealing. By changing the length of the portion, extending out of the liquid suction pipe, of the suction head, the same suction head can be matched with speartips of various models and sizes, adaptability is higher, and improvement of experiment efficiency, reduction of cost, simplification of operation procedures, enhancement of experiment flexibility and the like are facilitated. In addition, the adjusting part extends out of the pipette and can be directly adjusted, so that the operation convenience is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of pipettes, and particularly relates to a tip device for a pipette. Background Art

[0002] At present, pipettes (also called pipetting guns) on the market are metering tools that transfer liquid from an original container to another container within a certain range of measuring ranges. The main structure performs liquid suction and discharge operations by inserting a tip into the tip of the gun. The tip length of common pipettes on the market is fixed, that is, a type of pipette matches a tip of one size. The bottom of the tip is vertically inserted downward into the tip of the gun to form a seal for liquid suction and discharge operations. When the tip is inserted too deep into the tip of the gun, this sealing structure will be damaged or affected. The sealing failure will cause bubbles, liquid leakage or incomplete liquid suction during the liquid suction or discharge process, thus affecting the accuracy of the experiment. Therefore, a tip of one size can only match a tip of one type, with poor compatibility. It is necessary to frequently replace the tip to adapt to tips of different sizes, which increases the operation difficulty and the risk of contamination, is time-consuming and laborious, and seriously affects the overall efficiency of the experiment. Therefore, it is necessary for us to design a tip device for a pipette to solve these problems. Summary of the Utility Model

[0003] The problem to be solved by the utility model is to provide a tip device for a pipette, so that the same tip can match tips of multiple types and sizes, improve the experiment efficiency, reduce the cost, simplify the operation process and enhance the experiment flexibility, etc.

[0004] To solve the above technical problems, the technical solution adopted by the utility model is:

[0005] A tip device for a pipette, which can be connected to the pipette body, includes:

[0006] A liquid suction tube, which is connected to the pipette body;

[0007] A tip, which is connected to the end of the liquid suction tube far from the pipette body and is inserted into the tip of the gun;

[0008] A fixing component, which includes a support member arranged on the inner wall of the liquid suction tube;

[0009] An adjusting component, which includes a movable member rotatably arranged on the support member, and an adjusting member extending outward along the movable member and penetrating the liquid suction tube. The movable member is threadedly connected to the tip;

[0010] Wherein, the movable member is configured to drive the tip to axially slide relative to the liquid suction tube when the adjusting member is twisted, so that the tip is inserted into the tip of the gun to form a seal.

[0011] Further, the movable member includes a movable block threadedly connected to the outer wall of the suction head and a first convex portion provided on the movable block and rotatably connected to the support member. The side of the first convex portion away from the movable block is connected to the adjusting member.

[0012] Further, the cross-section of the liquid suction pipe in a direction perpendicular to the movement of the suction head is elliptical, and the cross-section of the adjusting member is circular. The two are coaxially arranged so that a part of the adjusting member extends out of the liquid suction pipe.

[0013] Further, a chute recessed inward is provided on the suction head, and the limiting member is inserted into the chute and moves along a direction parallel to the axial direction of the suction head to achieve a sliding connection between the limiting member and the suction head.

[0014] Further, a receiving groove for receiving the first convex portion is provided on the support member, and a bearing is provided in the receiving groove. The first convex portion is rotatably connected to the support member through the bearing.

[0015] Further, a baffle is also provided on the support member to limit the first convex portion from disengaging from the receiving groove.

[0016] Further, a connecting block is also provided on the support member, and a rotary sealing ring is provided between it and the suction head.

[0017] Further, the suction head includes a suction head main body threadedly connected to the movable block and an insertion end connected thereto and extending out of the liquid suction pipe. The outer diameter of a part of the insertion end gradually decreases in a direction away from the liquid suction pipe.

[0018] Further, strip-shaped protrusions are provided on the outer side of the insertion end. The strip-shaped protrusions are evenly distributed along the axial direction of the insertion end and are matched with strip-shaped grooves provided on the inner wall of the tip.

[0019] The advantages and positive effects of the present utility model are as follows: By providing a movable member rotatably connected to the suction head and a limiting member slidably connected thereto, when the adjusting member is twisted, the suction head can be driven to slide up and down relative to the liquid suction pipe, thereby changing the length of the suction head extending out of the liquid suction pipe, enabling the same suction head to match various models and sizes of tips, with stronger adaptability, facilitating popularization and application, reducing the time for frequently replacing the tip, contributing to improving the experimental efficiency, reducing costs, simplifying the operation process, and enhancing the experimental flexibility, etc. In addition, the adjusting member extends out of the liquid suction pipe, and can be directly adjusted, improving the convenience of operation. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 is the overall structural schematic diagram of the embodiment of the present invention;

[0022] Figure 2 is Figure 1 the partial cross-sectional view of A-A in

[0023] Figure 3 is Figure 1 the partial cross-sectional view of B-B in

[0024] The description of the reference numerals is as follows:

[0025] 100, liquid suction tube; 200, suction head; 210, suction head body; 220, insertion end; 230, chute; 300, tip; 410, support member; 411, receiving groove; 412, baffle; 413, connecting block; 510, movable member; 511, movable block; 512, first protrusion; 520, adjusting member. Specific embodiments

[0026] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0027] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.

[0028] The following further describes the present utility model with reference to the accompanying drawings:

[0029] As Figure 1 and Figure 2 shown, a tip device for a pipette, which can be connected to the pipette body, includes:

[0030] A liquid suction tube 100, which is connected to the pipette body;

[0031] A tip 200, which is connected to the end of the liquid suction tube 100 away from the pipette body and is inserted into the tip 300;

[0032] A fixing assembly, which includes a support member 410 and a limiting member 420 provided on the inner wall of the liquid suction tube 100;

[0033] An adjusting assembly, which includes a movable member 510 rotatably provided on the support member 400, and an adjusting member 520 extending outward along the movable member 510 and passing through the liquid suction tube 100 and rotatably connected to the liquid suction tube 100. The tip 200 is rotatably connected to the movable member 510 and slidably connected to the limiting member 420;

[0034] Among them, the movable member 510 is configured to drive the suction head 200 to axially slide relative to the liquid suction pipe 100 when the adjusting member 520 is twisted, so that the suction head 200 is inserted into the tip 300 to form a seal. In this embodiment, the movable member 510 is rotatably disposed within the support member 400, and the two can rotate relative to each other but cannot be disengaged. The limiting member 420 can only be slidably connected to the suction head 200 up and down, which is equivalent to restricting the axial rotation of the suction head 200. Therefore, when the adjusting member 520 is twisted, it drives the movable member 510 to move together. The suction head 200 cannot rotate but moves upward or downward relative to the liquid suction pipe 100, thereby changing the length H of the suction head 200 extending from the bottom of the liquid suction pipe 100. During use, the length H can be appropriately adjusted according to the size and position of the tip 300 to ensure the appropriate depth of the suction head 200 inserted into the tip 300, so that the suction head 200 is tightly combined with the tip 300, thereby forming a good seal. This setting enables the same suction head 200 to be used in combination with various models and sizes of tips 300, increasing the operation convenience, and contributing to improving the experimental efficiency, reducing the cost, simplifying the operation process, and enhancing the experimental flexibility, etc. In addition, the adjusting member 520 extends outside the liquid suction pipe 100, with simple operation, improving the operation convenience.

[0035] Preferably, the movable member 510 includes a movable block 511 threadedly connected to the outer wall of the suction head 200 and a first protrusion 512 disposed on the movable block 511 and rotatably connected to the support member 410. The side surface of the first protrusion 512 away from the movable block 511 is connected to the adjusting member 520.

[0036] Preferably, the cross-section of the liquid suction pipe 100 in the direction perpendicular to the movement of the suction head 200 is elliptical, and the cross-section of the adjusting member 520 is circular. The two are coaxially arranged so that a part of the adjusting member 520 extends outside the liquid suction pipe. In this embodiment, in combination with Figure 2 and Figure 3 as shown, the cross-section of the liquid suction pipe 100 in the direction perpendicular to the movement of the suction head 200 is elliptical, and the liquid suction pipe 100 and the suction head 200 are coaxially designed. This design enables the liquid suction pipe 100 and the adjusting member 520 to rotate relative to each other, but at the same time, a part of the liquid suction pipe 100 is reserved for contact with the adjusting member 520, so that the adjusting member 520 can laterally pass through the liquid suction pipe 100 and rotate relative to the liquid suction pipe 100. Of course, more preferably, the end of the liquid suction pipe 100 connected to the pipette body remains unchanged, and only a part of the outer wall of the liquid suction pipe 100 is elliptical, so that this suction head device can still match the existing pipettes, saving resources and costs.

[0037] Preferably, the movable member 510 and / or the adjusting member 520 are coaxially arranged with the suction head 200.

[0038] Preferably, the suction head 200 is provided with an inwardly recessed slide groove 230, and the limiting member 420 is inserted into the slide groove 230 and moves in a direction parallel to the axial direction of the suction head 200 to achieve a sliding connection between the limiting member 420 and the suction head 200. In this embodiment, if there is no axial limit of the limiting member 420, when the adjusting member 520 rotates, it will drive the suction head 200 to rotate together. The setting of the limiting member 420 is equivalent to limiting the rotation of the suction head 200. Therefore, driving the adjusting member 520 to rotate can only drive the suction head 200 to move up and down relative to the pipette 100. In addition, the existence of the limiting member 420 and the slide groove 230 controls the range in which the suction head 200 can move up and down in disguised form, thereby preventing the top of the suction head 200 from separating from the support member 410 and affecting the sealing effect of the sealing cavity.

[0039] Preferably, a receiving groove 411 for receiving the first protrusion 512 is provided on the support member 410 , a bearing is provided in the receiving groove 411 , and the first protrusion 512 is rotatably connected to the support member 410 via the bearing.

[0040] Preferably, a baffle 412 is provided on the support member 410 to limit the first protrusion 512 from being separated from the receiving groove 411 .

[0041] Preferably, the support member 410 further includes a connection block 413, and a rotating sealing ring is formed between the connection block 413 and the suction head 200. In this embodiment, the connection block 413 and the baffle 412 are disposed on both sides of the first protrusion 512. Specifically, the baffle 412 is disposed on one side of the bottom of the first protrusion 512, and the connection block 413 is disposed on one side of the top of the first protrusion 512. The rotating sealing ring design between the connection block 413 and the suction head 200 can withstand a high pressure, ensure the stability and reliability of the sealing performance of the liquid suction chamber, and then accurately move and distribute the liquid, thereby ensuring the accuracy and reliability of the experimental results.

[0042] Preferably, the suction head 200 includes a suction head body 210 threadedly connected to the movable block 511 and an insertion end 220 connected thereto and extending out of the suction tube 100, and the outer diameter of a portion of the insertion end 220 gradually decreases in a direction away from the suction tube 100.

[0043] Preferably, a strip-shaped protrusion 221 is provided on the outer side of the insertion end 220 , and the strip-shaped protrusion 221 is evenly distributed along the axial direction of the insertion end 220 and matches with the strip-shaped groove provided on the inner wall of the gun tip 300 .

[0044] When a larger-sized gun tip 300 is required, the length of the distance H needs to be increased, that is, the suction head 200 needs to be moved downward; otherwise, the suction head 200 needs to be driven to move upward to ensure that the bottom of the pipette 100 and the top of the gun tip 300 are maintained within a safe distance, and to help the operator quickly determine the depth of the suction head 200 inserted into the gun tip 300 to ensure that no leakage or falling off occurs during the suction or pipetting process.

[0045] The advantages and positive effects of the present utility model are as follows: An active member rotatably connected to the suction head and a limiting member slidably connected thereto are provided, which can drive the suction head to slide up and down relative to the liquid suction pipe when the adjusting member is twisted, thereby changing the length of the suction head extending outside the liquid suction pipe, so that the same suction head can match pipette tips of various models and sizes, with stronger adaptability, facilitating popularization and application, reducing the time for frequently replacing the pipette tips, helping to improve the experimental efficiency, reduce costs, simplify the operation process and enhance the experimental flexibility, etc. In addition, the adjusting member extends outside the liquid suction pipe and can be directly adjusted, improving the convenience of operation.

[0046] The above has described in detail an embodiment of the present utility model, but the content described is only the preferred embodiment of the present utility model and cannot be considered as limiting the scope of implementation of the present utility model. All equivalent changes and improvements made in accordance with the scope of the application of the present utility model should still fall within the scope covered by the patent of the present utility model.

Claims

1. A tip device for a pipette, which can be connected to the pipette body, characterized in that: include: A pipette connected to the pipette body; A suction head, which is connected to the end of the pipette away from the pipette body and plugged into the gun tip; A fixing assembly, comprising a supporting member and a limiting member arranged on the inner wall of the pipette; An adjusting component, comprising a movable member rotatably arranged on the supporting member, and an adjusting member extending outwardly from the movable member and penetrating the pipette and rotatably connected to the pipette, wherein the suction head is rotatably connected to the movable member head and slidably connected to the limiting member; Wherein, the movable part is configured to drive the suction head to slide axially relative to the pipette when the adjusting part is twisted, so that the suction head is inserted into the gun tip to form a seal.

2. The pipette tip device according to claim 1, characterized in that: The movable member comprises a movable block threadedly connected to the outer wall of the suction head and a first protrusion disposed on the movable block and rotatably connected to the support member, wherein the first protrusion is connected to the adjusting member at a side away from the movable block.

3. The pipette tip device according to claim 2, characterized in that: The cross section of the pipette along the direction perpendicular to the movement of the suction head is elliptical, and the cross section of the adjusting member is circular, and the two are coaxially arranged so that part of the adjusting member extends out of the pipette.

4. The pipette tip device according to any one of claims 1 to 3, characterized in that: The suction head is provided with an inwardly recessed slide groove, the limiting member is inserted into the slide groove and moves in a direction parallel to the axial direction of the suction head to achieve a sliding connection between the limiting member and the suction head.

5. The pipette tip device according to claim 2 or 3, characterized in that: The support member is provided with a receiving groove for receiving the first protrusion, a bearing is provided in the receiving groove, and the first protrusion is rotatably connected to the support member via the bearing.

6. The pipette tip device according to claim 5, characterized in that: The support member is also provided with a baffle plate for limiting the first protrusion from being separated from the accommodating groove.

7. The pipette tip device according to claim 6, characterized in that: The support member is also provided with a connecting block, and a rotating sealing ring is provided between the connecting block and the suction head.

8. The pipette tip device according to claim 7, wherein: The suction head comprises a suction head body threadedly connected to the movable block and an insertion end connected thereto and extending out of the pipette, and the outer diameter of a part of the insertion end gradually decreases in a direction away from the pipette.

9. The pipette tip device according to claim 8, characterized in that: A strip-shaped protrusion is arranged on the outer side of the insertion end. The strip-shaped protrusion is evenly distributed along the axial direction of the insertion end and matches with the strip-shaped groove arranged on the inner wall of the gun tip.

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