Volume-adjustable pipettor

Abstract

The utility model discloses a volume-adjustable pipettor, which comprises a shell, a volume-adjustable pipettor and a volume-adjustable pipettor, wherein a conduit is fixedly arranged in the shell; the plug block is arranged in the guide pipe in a sliding manner; the fixed block is rotationally arranged at the bottom end of the guide pipe; the suction head is inserted into the fixing block and is communicated with the guide pipe; the fixing assembly at least comprises an expansion block which is fixedly installed in the fixing block and is driven to abut against the suction head. According to the volume-adjustable pipettor provided by the utility model, the suction head is firstly inserted into the fixed block, so that the suction head is pre-fixed in the fixed block, and the fixed block is in threaded connection with the guide pipe through the fixed block, so that the fixed block can be mounted on the guide pipe, and in the threaded connection process of the fixed block and the guide pipe, the volume of the suction head can be adjusted by driving the expansion block to inflate and expand. According to the pipettor, the expansion block abuts against the suction head, so that the suction head is fixed, the suction head is prevented from loosening during liquid suction, the sealing performance of the suction head can be improved, and the liquid suction accuracy of the pipettor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipettes, in particular to a pipette with adjustable capacity. Background Art

[0002] The adjustable volume pipette is an essential precision tool in the laboratory. It is based on the principle of air displacement and piston telescopic movement to achieve precise control and removal of liquids.

[0003] When using an adjustable volume pipette for pipetting, in order to ensure accurate liquid transfer and prevent cross contamination, the experimenter needs to install the tip at the bottom of the pipette before taking liquid through the tip. The traditional tip installation method is to directly plug the tip into the trapezoidal block at the bottom of the pipette so that the tip can be clamped on the pipette. However, during the pipetting process, the tip can easily touch the inner wall of the glass container, causing the tip to loosen and affecting the sealing effect between the tip and the pipette. In severe cases, the tip may fall off directly, which not only reduces the accuracy of the pipette, but also contaminates the aspirated liquid. Utility Model Content

[0004] The purpose of the utility model is to provide a pipette with adjustable capacity, so as to solve the above problems.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical solution: an adjustable volume pipette, comprising:

[0006] a housing, wherein a conduit is fixedly installed in the housing;

[0007] a plug slidably disposed within the conduit;

[0008] Rotating a fixed block disposed at the bottom end of the conduit;

[0009] A suction head inserted into the fixed block and connected to the catheter;

[0010] The fixing assembly at least comprises an expansion block fixedly installed in the fixing block and driven to abut against the suction head.

[0011] Preferably, a groove is formed at the bottom of the fixing block, a suction head is fixedly connected to the groove, a rubber block is fixedly installed in the groove, and the rubber block abuts against the suction head.

[0012] Preferably, an expansion block is fixedly connected in the groove.

[0013] Preferably, a mounting groove is provided at the top of the fixing block, a through hole is provided at the side wall of the fixing block, one end of the through hole is connected to the mounting groove, and the other end of the through hole is connected to the expansion block.

[0014] Preferably, a conduit is threadedly connected in the installation groove, an elastic member is fixedly installed in the installation groove, a sealing block is fixedly installed on the end surface of the elastic member, and the sealing block abuts against the conduit.

[0015] Preferably, a push rod is movably mounted on the top end of the shell, and the bottom end of the push rod is fixedly connected to the plug.

[0016] Preferably, a slide groove is provided on the side wall of the conduit, a spring is fixedly installed in the slide groove, a slider is fixedly installed on the end surface of the spring, and the side wall of the slider is fixedly connected to the push rod.

[0017] In the above technical solution, the utility model provides an adjustable volume pipette, which has the following beneficial effects:

[0018] (1) The present invention can conveniently fix the suction tip on the catheter by arranging a catheter, a plug block, a fixing block, a suction tip and an expansion block. The suction tip is pre-fixed in the fixing block by first inserting the suction tip into the fixing block, and the fixing block is connected to the catheter thread so that the fixing block can be installed on the catheter. In the process of threading the fixing block and the catheter, the expansion block is driven to inflate so that the expansion block abuts against the suction tip, thereby fixing the suction tip. This not only prevents the suction tip from loosening during liquid aspiration, but also improves the sealing of the suction tip, thereby increasing the accuracy of the pipette when aspirating liquid.

[0019] (2) The present invention can improve the fixing effect of the suction head by providing grooves and rubber blocks.

[0020] (3) The utility model provides the installation groove, the through hole, the elastic member and the sealing block, so that when the fixing block is connected to the conduit thread, the conduit can push the sealing block to inflate the expansion block.

[0021] (4) The present invention can facilitate the push rod to adjust the amount of liquid sucked by the catheter by providing a push rod, a slide groove, a spring and a slider. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the catheter of the present invention;

[0025] Figure 3 This is a schematic diagram of the fixed block structure of the present utility model.

[0026] Description of reference numerals:

[0027] 1. Shell; 2. Conduit; 3. Push rod; 4. Block; 5. Slide; 6. Spring; 7. Slider; 8. Fixed block; 9. Suction head; 10. Groove; 11. Rubber block; 12. Mounting slot; 13. Elastic part; 14. Sealing block; 15. Expansion block; 16. Through hole. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-3 As shown, an adjustable volume pipette comprises:

[0030] A housing 1, wherein a conduit 2 is fixedly installed in the housing 1;

[0031] A plug 4 slidably disposed in the conduit 2;

[0032] Rotate the fixing block 8 provided at the bottom end of the conduit 2;

[0033] A suction head 9 inserted into the fixed block 8 and connected to the conduit 2;

[0034] The fixing assembly at least includes an expansion block 15 fixedly installed in the fixing block 8 and driven to abut against the suction head 9.

[0035] Specifically, when the experimenter uses the pipette, he first inserts the suction tip 9 into the fixed block 8 so that the suction tip 9 is connected to the fixed block 8, and drives the fixed block 8 to rotate along the bottom of the catheter 2 so that the fixed block 8 is threadedly connected to the catheter 2, so that the fixed block 8 is installed on the catheter 2. When the fixed block 8 is installed on the catheter 2, the expansion block 15 is inflated so that the expansion block 15 expands and abuts against the inner wall of the suction tip 9, so that the suction tip 9 can be fixed in the fixed block 8, and the connection between the suction tip 9 and the fixed block 8 is sealed by the expansion block 15, so that the suction tip 9 can stably absorb liquid, which solves the problem that the suction tip 9 is prone to loosening when it touches the glass container.

[0036] In the above embodiment, by providing the catheter 2, the plug block 4, the fixed block 8, the suction tip 9 and the expansion block 15, the suction tip 9 can be conveniently fixed on the catheter 2. By first inserting the suction tip 9 into the fixed block 8, the suction tip 9 is pre-fixed in the fixed block 8, and the fixed block 8 is threadedly connected to the catheter 2, so that the fixed block 8 can be installed on the catheter 2. In the process of threaded connection between the fixed block 8 and the catheter 2, the expansion block 15 is driven to inflate, so that the expansion block 15 abuts against the suction tip 9, thereby fixing the suction tip 9. This not only avoids the suction tip 9 from loosening during liquid aspiration, but also improves the sealing of the suction tip 9, thereby increasing the accuracy of the pipette when aspirating liquid.

[0037] As an embodiment further provided by the present invention, a groove 10 is provided at the bottom of the fixing block 8 , a suction head 9 is fixedly connected to the groove 10 , a rubber block 11 is fixedly installed in the groove 10 , and the rubber block 11 abuts against the suction head 9 .

[0038] Specifically, by opening a groove 10 at the bottom of the fixing block 8, the suction head 9 can be quickly snapped into the groove 10. When the suction head 9 is snapped into the groove 10, the side wall of the rubber block 11 abuts against the suction head 9, so that the rubber block 11 improves the fixing effect of the suction head 9, thereby allowing the suction head 9 to be pre-fixed in the fixing block 8.

[0039] As another embodiment further provided by the present invention, an expansion block 15 is fixedly connected in the groove 10 .

[0040] Furthermore, a mounting groove 12 is provided at the top of the fixing block 8 , and a through hole 16 is provided on the side wall of the fixing block 8 . One end of the through hole 16 is connected to the mounting groove 12 , and the other end of the through hole 16 is connected to the expansion block 15 .

[0041] Furthermore, the conduit 2 is connected to the inner thread of the installation groove 12 , an elastic member 13 is fixedly installed in the installation groove 12 , a sealing block 14 is fixedly installed on the end surface of the elastic member 13 , and the sealing block 14 abuts against the conduit 2 .

[0042] Specifically, when the fixing block 8 is threadedly connected to the conduit 2, the conduit 2 moves into the mounting groove 12, so that the conduit 2 pushes the sealing block 14 downward, and the sealing block 14 pushes the air in the mounting groove 12 along the through hole 16 into the expansion block 15. The expansion block 15 expands and abuts against the inner wall of the suction head 9, so that the expansion block 15 cooperates with the rubber block 11 to clamp and seal the suction head 9, so that the suction head 9 can be fixed in the fixing block 8. When the conduit 2 is separated from the mounting groove 12, the elastic member 13 pushes the sealing block 14 to reset, so that the air in the expansion block 15 is extracted, and the suction head 9 can be separated from the fixing block 8.

[0043] As another embodiment further provided by the present invention, a push rod 3 is movably mounted on the top of the housing 1 , and the bottom end of the push rod 3 is fixedly connected to the plug 4 .

[0044] Furthermore, a slide groove 5 is provided on the side wall of the conduit 2 , a spring 6 is fixedly installed in the slide groove 5 , a slider 7 is fixedly installed on the end surface of the spring 6 , and the side wall of the slider 7 is fixedly connected to the push rod 3 .

[0045] Specifically, the plug 4 is pushed downward along the catheter 2 by the push rod 3, so that the plug 4 can adjust the amount of liquid drawn by the catheter 2. When the plug 4 is pressed down to a predetermined position, the slider 7 is pushed upward along the slide groove 5 by the spring 6, so that the slider 7 pushes the catheter 2 upward, thereby causing the catheter 2 to drive the plug 4 upward. When the plug 4 moves upward, negative pressure is generated in the catheter 2, so that the catheter 2 provides suction to the suction head 9, so that the suction head 9 absorbs a fixed volume of liquid.

[0046] Working principle: When the experimenter uses the pipette, by inserting the pipette tip 9 into the groove 10 opened in the fixed block 8, the rubber block 11 abuts against the pipette tip 9, so that the pipette tip 9 is pre-fixed in the fixed block 8. By threading the fixed block 8 on the conduit 2, the bottom end of the conduit 2 extends into the mounting groove 12. When the conduit 2 enters the mounting groove 12, the sealing block 14 is pushed by the conduit 2 to squeeze the elastic member 13 downward, so that the gas in the mounting groove 12 passes through the through hole 16 and enters the expansion block 15, so that the expansion block 15 quickly expands and abuts against the inner wall of the pipette tip 9. The expansion block 15 cooperates with the rubber block 11 to clamp the suction head 9, so that the suction head 9 can be fixed in the fixing block 8 to prevent the suction head 9 from loosening when touching the inner wall of the glass container. When the suction head 9 is fixed, the push rod 3 is driven to push the plug 4 down along the catheter 2, so that the plug 4 adjusts the amount of liquid sucked by the catheter 2 according to the downward distance, so that the experimenter can control the amount of liquid pumped. The spring 6 provides thrust to the slider 7, so that the slider 7 pushes the push rod 3 to drive the plug 4 to move upward, thereby generating negative pressure in the catheter 2. The negative pressure generated in the catheter 2 drives the suction head 9 to inhale a fixed amount of liquid.

[0047] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An adjustable volume pipette, characterized in that: include: A housing (1), wherein a conduit (2) is fixedly installed in the housing (1); A plug (4) slidably disposed in the conduit (2); Rotating a fixed block (8) disposed at the bottom end of the conduit (2); A suction head (9) inserted into the fixed block (8) and connected to the conduit (2); The fixing assembly at least comprises an expansion block (15) fixedly mounted in the fixing block (8) and driven to abut against the suction head (9).

2. An adjustable volume pipette according to claim 1, characterized in that: A groove (10) is provided at the bottom of the fixing block (8), a suction head (9) is fixedly connected in the groove (10), a rubber block (11) is fixedly installed in the groove (10), and the rubber block (11) abuts against the suction head (9).

3. The adjustable volume pipette according to claim 2, characterized in that: An expansion block (15) is fixedly connected in the groove (10).

4. The adjustable volume pipette according to claim 2, characterized in that: The top of the fixing block (8) is provided with a mounting groove (12), and the side wall of the fixing block (8) is provided with a through hole (16), one end of the through hole (16) is connected to the mounting groove (12), and the other end of the through hole (16) is connected to the expansion block (15).

5. The adjustable volume pipette according to claim 4, characterized in that: The installation groove (12) is internally threadedly connected to a conduit (2), an elastic member (13) is fixedly installed in the installation groove (12), a sealing block (14) is fixedly installed on the end surface of the elastic member (13), and the sealing block (14) abuts against the conduit (2).

6. The adjustable volume pipette according to claim 1, characterized in that: A push rod (3) is movably mounted on the top end of the housing (1), and the bottom end of the push rod (3) is fixedly connected to the plug (4).

7. The adjustable volume pipette according to claim 5, characterized in that: A slide groove (5) is provided on the side wall of the conduit (2), a spring (6) is fixedly installed in the slide groove (5), a slider (7) is fixedly installed on the end surface of the spring (6), and the side wall of the slider (7) is fixedly connected to the push rod (3).

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