Pipettor

Abstract

The utility model provides a pipettor which comprises a cylinder body, a necking part is arranged at one end of the cylinder body, a liquid discharge pipe is fixed on the necking part, a cavity is formed in the cylinder body, a fixed seat is fixed on the inner wall of the cavity, a threaded hole is formed in the fixed seat, a threaded pipe is rotatably mounted in the threaded hole, and a liquid discharge pipe is fixed on the threaded pipe. And a movable column is movably installed in the threaded pipe, a limiting end is fixed to one end of the movable column, and the limiting end is matched with one end of the threaded pipe. According to the pipettor disclosed by the utility model, the threaded pipe rotates on the fixed seat, the exposed length of the top of the threaded pipe can be adjusted, the threaded pipe limits the moving distance of the movable column, and quantitative pipetting is completed after the later-period limiting end is in contact with the top of the threaded pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipette field, concretely is a pipette. BACKGROUND

[0002] The pipette is a device for transferring liquid, and is used for taking a small or trace amount of liquid in a microbiological laboratory, and different specifications of pipettes are widely used in the laboratory at present, the pipette with high precision has small range and small graduation value, and is inconvenient to adjust, and although the pipette with large range and large graduation value is fast to adjust, the precision is not high, therefore, different specifications of pipettes need to be used in the process of preparing corresponding reagents.

[0003] According to the patent document with the existing publication number CN211660029U, a pipette device is disclosed, which comprises a button, a guide rod, a screw sleeve, a telescopic sleeve, a gear ring, a linkage gear, a gun shell, a piston and a gun head, the gun shell comprises a piston hole penetrating through two opposite ends, the screw sleeve is rotatably arranged at one end of the piston hole, the gun head is arranged at the other end of the piston hole, the piston is arranged between the screw sleeve and the gun head in the piston hole, and the telescopic sleeve is threadedly connected in the screw sleeve and moves with the screw sleeve, when the technical scheme is used, the problem of large range and high precision and easy adjustment is solved, but the following problems exist: the volume of the liquid cannot be quickly and multi-section quantitatively pipetted during use, and inconvenience exists during use. UTILITY MODEL CONTENTS

[0004] In view of the deficiencies of the prior art, the utility model aims to provide a pipette to solve the problems in the background art, the utility model has novel structure, when the screw pipe is rotated on the fixing seat, the length of the screw pipe exposed at the top is adjusted, the screw pipe limits the movement distance of the movable column, and the multi-section quantitative pipetting is completed after the limiting end head contacts the top of the screw pipe.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: including the cylinder, one end of the cylinder is provided with the neck-in part, the neck-in part is fixed with the liquid discharge pipe, the inside of the cylinder is opened with the cavity, the inner wall of the cavity is fixed with two fixing seats at the upper end, the fixing seat is opened with the threaded hole, the threaded hole is rotatably installed with the screw pipe in the inside, the inside of the screw pipe is movably installed with the movable column, one end of the movable column is fixed with the limiting end head, the limiting end head is limited and matched with the upper end of the screw pipe, the inside of the cylinder is movably installed with the lower piston, the top of the lower piston is movably installed with the upper piston, the upper piston is opened with the opening for the movable column to pass through, one of the two movable columns is fixedly connected with the lower piston through the opening, and the lower end of the other movable column is fixedly connected with the upper piston.

[0006] Further, the movable column is provided with scale lines, and the scale lines are matched with the upper end of the threaded pipe to realize quantitative indication.

[0007] Further, a partition plate is fixedly arranged in the barrel, the partition plate is located above the upper piston, a positioning column extending upward is fixed on the lower piston, a positioning hole matched with the positioning column is formed in the upper piston, the positioning column passes through the positioning hole and then movably passes out of the partition plate, and an elastic member is arranged between the upper end of the positioning column and the partition plate.

[0008] Further, the elastic member is a compression spring sleeved on the positioning column, the upper end of the compression spring abuts against the top of the positioning column, and the lower end of the compression spring abuts against the partition plate.

[0009] Further, a sliding groove is formed in the positioning column, and a guide protrusion is arranged on the inner wall of the perforation of the partition plate, and the up-and-down movement of the positioning column is limited and guided through the limiting cooperation of the guide protrusion and the sliding groove.

[0010] The beneficial effects of the utility model are as follows:

[0011] 1. The threaded pipe is rotated on the fixing seat, the length of the threaded pipe exposed at the top is adjusted, the threaded pipe limits the moving distance of the movable column, and the quantitative pipetting is completed after the limiting end head contacts the top of the threaded pipe.

[0012] 2. After the movable column pushes the piston to move a distance, the movable column moved out of the piston can push the piston to move to a different distance again, and the pipetting of two different quantities is completed through the cooperation of the two movable columns.

[0013] 3. The piston is driven by the elastic member to move upward, the piston moves to suck liquid from the liquid discharge pipe, so that the piston is returned to the original position and the next liquid discharge is prepared, and the positioning column cooperates with the piston to ensure the vertical movement of the piston. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is a structure schematic view of the pipettor;

[0015] Fig. 2 It is a structure schematic view of the pipettor after amplification of point A;

[0016] Fig. 3 It is a barrel partial side view sectional structure schematic view of the pipettor;

[0017] Fig. 4 It is a structure schematic view of the pipettor after amplification of point B;

[0018] In the figure: 1, cylinder; 2, necking part; 3, liquid discharge pipe; 4, cavity; 5, fixed seat; 6, threaded hole; 7, threaded pipe; 8, movable column; 9, scale line; 10, limit end; 11, lower piston; 12, upper piston; 13, partition plate; 14, through hole; 15, positioning hole; 16, opening; 17, positioning column; 18, sliding groove; 19, sliding block; 20, elastic member. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0020] Please refer to Figs. 1 to 4 The utility model provides a technical scheme: including cylinder 1, one end of cylinder 1 is equipped with necking part 2, is fixed with liquid discharge pipe 3 on necking part 2, is opened in the inside of cylinder 1 cavity 4, two fixed seats 5 are fixed on the inner wall of cavity 4 upper end, is opened in the threaded hole 6 of fixed seat 5, is rotatably installed with threaded pipe 7 in the inside of threaded hole 6, is movably installed with movable column 8 in the inside of threaded pipe 7, one end of movable column 8 is fixed with limit end 10, limit end 10 and the upper end of threaded pipe 7 limit cooperation is carried out, the inside of cylinder 1 is movably installed with lower piston 11, the top of lower piston 11 is movably installed with upper piston 12, is opened in the opening 16 of upper piston 12 and is passed through for movable column 8, one of two movable columns 8 lower end passes through opening 16 and is fixedly connected with lower piston 11, and the lower end of another movable column 8 is fixedly connected with upper piston 12. Upper piston 12 and lower piston 11 cooperate to realize the extrusion of two distances under liquid discharge, to complete the double specification of liquid discharge use when testing.

[0021] In the embodiment, preferably, scale line 9 is opened on movable column 8, and scale line 9 cooperates with the upper end of threaded pipe 7 to realize quantitative indication.

[0022] In the embodiment, preferably, partition plate 13 is fixedly installed in the inside of cylinder 1, partition plate 13 is located above upper piston 12, a positioning column 17 extending upwards is fixed on lower piston 11, a positioning hole 15 adapted to positioning column 17 is opened in upper piston 12, positioning column 17 passes through positioning hole 15 and then movably passes out from partition plate 13, and an elastic member 20 is arranged between the upper end of positioning column 17 and partition plate 13.

[0023] In the embodiment, preferably, elastic member 20 is a compression spring sleeved on positioning column 17, the upper end of compression spring abuts against the top of positioning column 17, and the lower end abuts against partition plate 13. Elastic member 20 is a supporting spring, the supporting spring pushes positioning column 17 to move upwards, positioning column 17 moves upwards at the same time to drive lower piston 11 to complete liquid suction

[0024] In this embodiment, preferably, a sliding groove 18 is formed on the positioning column 17, and a guide protrusion 19 is arranged at the inner wall of the through hole of the partition plate 13, and the up-down movement of the positioning column 17 is limited and guided by the limiting cooperation between the guide protrusion 19 and the sliding groove 18.

[0025] When the device is used, the height of the threaded tube 7 exposed on the fixed seat 5 is adjusted according to the pipetting requirement, the threaded tube 7 is rotated and moves up and down in the threaded hole 6, the top of the threaded tube 7 is adjusted to the position matched with the scale line 9, after the threaded tube 7 is adjusted, the limiting end 10 is pressed and moves to stop at one end of the threaded tube 7, the movable column 8 preferentially pushes the upper piston 12 to move, the upper piston 12 pushes the lower piston 11 to move a distance to complete the early-stage liquid discharge of one specification, after the upper piston 12 cannot move, the movable column 8 at another position is pressed, the movable column 8 moves downward by a distance, the lower piston 11 pushes the liquid downward to complete the liquid discharge again, the volumes of the two times of liquid discharge can be the same or different, and the adjustment is made according to the adding requirement, after the lower piston 11 moves, the liquid discharge pipe 3 is moved to the inside of the liquid container, with the upward movement of the lower piston 11, the liquid discharge pipe 3 completes the liquid suction again, the lower piston 11 pushes the upper piston 12 to move upward to the home position, and after the home position, the next use is facilitated.

[0026] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be combined appropriately to form other embodiments that those skilled in the art can understand.

Claims

1. A pipette characterized by: The utility model provides a liquid discharging device, including the cylinder, one end of the cylinder is equipped with the necking portion, the necking portion is fixed with the liquid discharge pipe, the inside of the cylinder is opened the cavity, the inner wall of the cavity is fixed with two fixed bases on the upper end, the fixed base is opened the screw hole, the inside of screw hole is rotatably installed with the threaded pipe, the inside of threaded pipe is movably installed with the movable column, the one end of movable column is fixed with the limit end, the limit end and the upper end of threaded pipe limit cooperation, the inside of cylinder is movably installed with the lower piston, the top of lower piston is movably installed with the upper piston, the upper piston is opened the aperture that the movable column passes, and the lower end of one of two movable columns passes the aperture and is fixedly connected with the lower piston, and the lower end of another movable column is fixedly connected with the upper piston.

2. A pipette according to claim 1, characterized in that: The movable column is opened the scale line, and the scale line is matched with the upper end of threaded pipe to realize quantitative indication.

3. The pipette of claim 1, wherein: The inside of cylinder is fixedly installed with the partition board, and the partition board is located the upper piston, and a positioning column extending upwards is fixed on the lower piston, a positioning hole matched with the positioning column is formed in the upper piston, the positioning column passes through the positioning hole and then movably passes out from the partition board, and an elastic member is arranged between the upper end of the positioning column and the partition board.

4. The pipette of claim 3, wherein: The elastic member is a compression spring sleeved on the positioning column, the upper end of the compression spring abuts against the top of the positioning column, and the lower end abuts against the partition board.

5. The pipette of claim 4, wherein: The positioning column is opened the sliding slot, the inner wall of the perforation of the partition board is provided with a guide protrusion, and the up-and-down movement of the positioning column is limited and guided through the limit cooperation of the guide protrusion and the sliding slot.

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