Pipettor with leakage-proof structure

Abstract

The utility model provides a pipettor with a leakproof structure, which relates to the technical field of pipettors and comprises a pipettor body, a leakproof mechanism is arranged in the pipettor body, a second cavity is arranged in the pipettor body, a second piston is mounted in the second cavity, a second push rod is mounted at the upper end of the second piston, and a second piston rod is mounted at the lower end of the second piston. And the second push rod is movably mounted in the pipettor body in a penetrating manner. According to the utility model, the second cavity is matched with the second piston to control the sampling capacity of the liquid, and then the first cavity is matched with the first piston to push the liquid in the suction head to move upwards again after the liquid is sampled, so that the lower end of the suction head is in a hollow pipe state, and even if the liquid still flows, the liquid in the suction head does not flow. However, the flowing speed of the liquid is reduced by blocking the liquid through the hollow pipe, sufficient time is provided for a user to transfer the liquid, and the situation that the liquid leaks in the transfer process is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of pipettes, and more specifically, to a pipette with a leak-proof structure. Background Art

[0002] A pipette can be considered as one of the most commonly used manual tools in a laboratory. Generally, a pipette is used to extract one or more sub-samples from a large-volume fluid container, and fluids that can be repeatedly extracted and dispensed in various configurations can be obtained. For example, a micropipette for food detection proposed in the publication number "CN106525503A" includes a pipette body; the pipette body mainly consists of a barrel, a pusher, a connecting rod, and a tip. A connecting tube is fixedly connected to the bottom of the barrel. A pusher is arranged at the top of the pipette body. A connecting rod is arranged inside the pipette body, and the connecting rod is fixedly connected to the pusher; a piston is fixedly connected to the bottom of the connecting rod; a spring is arranged inside the barrel of the pipette body. The bottom of the pipette body is detachably connected with a tip. A partition is fixedly connected to the inner top of the tip, and a plurality of micropores are evenly distributed on the partition; an occlusion flap is fixedly connected to the inner wall above the partition inside the tip. The occlusion flap is in a hemispherical structure and is integrally formed with the tip; a floating ball is arranged between the occlusion flap and the partition. This micropipette can effectively and accurately transfer a quantitative solution to be measured, avoiding inaccurate detection results caused by excessive volume of the solution during transfer. The detection result of this device is accurate, greatly improving the food safety for consumption.

[0003] However, in the above technical solution, although the solution can be transferred, during the liquid transfer process, it is easy for the liquid to leak out through the tip, which not only causes inaccurate liquid sampling volume, but also the leaked liquid is very inconvenient to the external objects. Therefore, we propose a pipette with a leak-proof structure to solve the above problems. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a pipette with a leak-proof structure, which solves the problems that although the solution can be transferred, during the liquid transfer process, it is easy for the liquid to leak out through the tip, which not only causes inaccurate liquid sampling volume, but also the leaked liquid is very inconvenient to the external objects.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A pipette with a leak-proof structure, comprising a pipette body, wherein a leak-proof mechanism is provided inside the pipette body, a second cavity is provided inside the pipette body, a second piston is installed inside the second cavity, a second push rod is installed at the upper end of the second piston, the second push rod is movably installed through the pipette body, a button is installed at the upper end of the pipette body, the button is connected to the second push rod, a suction head is installed at the lower end of the pipette body, the suction head is connected to the second cavity, a support frame is installed at the upper end of one side of the pipette body, the leak-proof mechanism includes a first cavity, the first cavity is provided inside the pipette body, the lower end of the first cavity is connected to the suction head, a first piston is installed inside the first cavity, a first push rod is installed at the upper end of the first piston, the first push rod is movably installed through the pipette body and is connected to the second push rod.

[0007] Preferably, a connecting pipe is installed through the lower end inside the second cavity, the connecting pipe is snap-connected to the suction head, a groove is provided at the upper end inside the pipette body, and the button and the second push rod are movably installed inside the groove.

[0008] Preferably, a spring is sleeved and installed on the outer side of the rod body of the second push rod located inside the groove, and the spring is in contact with the button and the groove.

[0009] Preferably, a movable groove is provided at one end inside the groove, the upper end of the first push rod is movably installed through the movable groove, a transmission plate is fixedly installed at the upper end of the rod body of the second push rod located inside the groove, the transmission plate is movably installed inside the movable groove and is in contact with the first push rod.

[0010] Preferably, a guiding groove is provided through one end inside the movable groove, a connecting block is movably installed through the guiding groove, and the connecting block is connected to the first push rod.

[0011] Preferably, an air guide hole is provided through between the lower end inside the first cavity and the connecting pipe.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] (1) In the utility model, through the cooperation of the second cavity and the second piston, the sampling volume of the liquid is controlled, and then through the cooperation of the first cavity and the first piston, after the liquid sampling is completed, the air pushes the liquid inside the suction head to move up again, so that the lower end of the suction head forms a state of an empty pipe. Therefore, even if the liquid still flows, the flow rate of the liquid is reduced by the obstruction of the empty pipe, giving the user sufficient time to transfer the liquid and avoiding the leakage of the liquid during the transfer process.

[0014] (2) In the present utility model, the cooperation between the second cavity and the second piston is used to control the sampling volume of the liquid, while the first cavity and the first piston are used to control the height of the empty tube at the lower end of the pipette tip. This can not only leave sufficient space for the user to perform pipetting work, but also prevent the liquid from coming into contact with the connecting tube or the first cavity, avoiding contamination of the next portion of liquid and ensuring the purity of the liquid to a greater extent. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the overall structure of a pipette with a leak-proof structure according to the present utility model;

[0016] Figure 2 is a front view structural schematic diagram of a pipette with a leak-proof structure according to the present utility model;

[0017] Figure 3 is a side view structural schematic diagram of a pipette with a leak-proof structure according to the present utility model;

[0018] Figure 4 is a sectional structural schematic diagram of the A-A section of a pipette with a leak-proof structure according to the present utility model; Figure 2 in the present utility model.

[0019] In the figure: 1, pipette body; 2, button; 3, support frame; 4, pipette tip; 5, leak-proof mechanism; 501, drive plate; 502, first push rod; 503, movable groove; 504, first cavity; 505, first piston; 506, air guide hole; 507, connecting block; 508, guiding groove; 6, groove; 7, second push rod; 8, spring; 9, second cavity; 10, second piston; 11, connecting tube. Detailed Embodiment

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] Such as Figures 1 to 4As shown in the figure, an embodiment of the present utility model provides a pipette with a leak-proof structure, which includes a pipette body 1. A leak-proof mechanism 5 is provided inside the pipette body 1. A second cavity 9 is provided inside the pipette body 1. A second piston 10 is installed inside the second cavity 9. A second push rod 7 is installed at the upper end of the second piston 10. The second push rod 7 is movably installed through the pipette body 1. A button 2 is installed at the upper end of the pipette body 1. The button 2 is connected to the second push rod 7. A pipette tip 4 is installed at the lower end of the pipette body 1. The pipette tip 4 is connected to the second cavity 9. A support frame 3 is installed at the upper end of one side of the pipette body 1. The leak-proof mechanism 5 includes a first cavity 504. The first cavity 504 is provided inside the pipette body 1. The lower end of the first cavity 504 is connected to the pipette tip 4. A first piston 505 is installed inside the first cavity 504. A first push rod 502 is installed at the upper end of the first piston 505. The first push rod 502 is movably installed through the pipette body 1 and is connected to the second push rod 7.

[0022] As Figure 4 shown, in another embodiment of the present utility model, a connecting pipe 11 is installed through the lower end of the second cavity 9. The connecting pipe 11 is snap-connected to the pipette tip 4. A groove 6 is provided at the upper end inside the pipette body 1. The button 2 and the second push rod 7 are movably installed inside the groove 6. A spring 8 is sleeved outside the rod body of the second push rod 7 located inside the groove 6. The spring 8 is in contact with the button 2 and the groove 6. An activity groove 503 is provided at one end inside the groove 6. The upper end of the first push rod 502 is movably installed through the activity groove 503. A transmission plate 501 is fixedly installed at the upper end of the rod body of the second push rod 7 located inside the groove 6. The transmission plate 501 is movably installed inside the activity groove 503 and is in contact with the first push rod 502. A guiding groove 508 is provided through one end inside the activity groove 503. A connecting block 507 is movably installed through the guiding groove 508. The connecting block 507 is connected to the first push rod 502. An air guide hole 506 is provided through between the lower end of the first cavity 504 and the connecting pipe 11.

[0023] The user holds the pipette body 1 with the palm, and then presses the button 2 downward, so that the button 2 drives the second push rod 7 to move downward, causing the second push rod 7 to control the second piston 10 to move downward along the second cavity 9, discharging the air in the second cavity 9 along the connecting pipe 11. At the same time, when the button 2 pushes the second push rod 7, the button 2 will squeeze the spring 8. And when the second push rod 7 moves downward, it will also push the first push rod 502 through the transmission plate 501, causing the first push rod 502 to drive the connecting block 507 and the first piston 505 to move downward, so that the first piston 505 pushes the air in the first cavity 504 out. At the same time, the user's little finger or ring finger positions the connecting block 507 to keep it in a stable state;

[0024] After the air inside the first cavity 504 and the second cavity 9 is exhausted, the user can control the pipette body 1 to move to the upper part of the suction head 4, so that the suction head 4 and the connecting tube 11 are engaged and connected, and then the lower end of the suction head 4 can be placed into the liquid. After one end of the suction head 4 enters the liquid, the user can release the button 2 and let the spring 8 push the button 2 and the second push rod 7. Then, as the second push rod 7 moves upward, the second push rod 7 drives the second piston 10 to move along the inner wall of the second cavity 9, so that the suction head 4 absorbs the liquid for sampling through negative pressure, and then after the liquid sampling is completed, The user can detach the air suction head 4 from the suction head 4, and at the same time, push the connecting block 507 upwards with a finger, so that the connecting block 507 drives the first push rod 502 and the first piston 505 to move, so that the first piston 505 forms a negative pressure when moving upward along the first cavity 504, and the negative pressure attracts the outside air, so that the air enters the lower end of the suction head 4, and pushes the liquid in the suction head 4 upwards, so that the lower end of the suction head 4 forms an empty tube, so as to leave enough time for the liquid to be transferred, avoid the situation that the liquid leaks through the lower end of the suction head 4, and make the liquid suction and transfer amount more accurate.

[0025] The working principle of a pipette with a leak-proof structure:

[0026] In use, first, the user holds the pipette body 1 with the palm of the hand, then presses the button 2 downwards, causing the button 2 to drive the second push rod 7 to move downwards, so that the second push rod 7 controls the second piston 10 to move downwards along the second cavity 9, discharging the air in the second cavity 9 along the connecting pipe 11. At the same time, when the button 2 pushes the second push rod 7, the button 2 squeezes the spring 8. And when the second push rod 7 moves downwards, it also drives the first push rod 502 through the transmission plate 501, causing the first push rod 502 to drive the connecting block 507 and the first piston 505 to move downwards, so that the first piston 505 pushes and discharges the air in the first cavity 504. At the same time, the user's little finger or ring finger positions the connecting block 507. After the air in the first cavity 504 and the second cavity 9 is discharged, the user can control the pipette body 1 to move above the tip 4, so that the tip 4 and the connecting pipe 11 are snap-connected. Then the lower end of the tip 4 can be placed into the liquid. After one end of the tip 4 enters the liquid, the user can release the button 2, allowing the spring 8 to push the button 2 and the second push rod 7. Then, as the second push rod 7 moves upwards, the second push rod 7 drives the second piston 10 to move along the inner wall of the second cavity 9, thereby sucking and sampling the liquid through negative pressure by the tip 4. After the liquid sampling is completed, the user can separate the air tip 4 from the tip 4. At the same time, by moving the connecting block 507 upwards with the finger, the connecting block 507 drives the first push rod 502 and the first piston 505 to move, so that the first piston 505 forms a negative pressure when moving upwards along the first cavity 504, attracting the outside air, allowing the air to enter the lower end of the tip 4 and pushing the liquid in the tip 4 upwards, making the lower end of the tip 4 an empty tube, leaving enough time to transfer the liquid. Then, after moving to the liquid transfer position, the user can press the button 2 again, allowing the air pressure to push the liquid out of the tip 4 to complete the transfer work, which is more simple and fast.

[0027] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, based on the above description, other different forms of changes or variations can be made. It is impossible to enumerate all the embodiments here. Any obvious changes or variations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A pipette with a leak-proof structure, comprising a pipette body (1), characterized in that: Inside the pipette body (1), a leak prevention mechanism (5) is provided. Inside the pipette body (1), a second cavity (9) is provided. Inside the second cavity (9), a second piston (10) is installed. At the upper end of the second piston (10), a second push rod (7) is installed. The second push rod (7) is movably installed through the pipette body (1). At the upper end of the pipette body (1), a button (2) is installed. The button (2) is connected to the second push rod (7). At the lower end of the pipette body (1), a tip (4) is installed. The tip (4) is connected to the second cavity (9). At the upper side of one side of the pipette body (1), a support frame (3) is installed. The leak prevention mechanism (5) includes a first cavity (504). The first cavity (504) is provided inside the pipette body (1). The lower end of the first cavity (504) is connected to the tip (4). Inside the first cavity (504), a first piston (505) is installed. At the upper end of the first piston (505), a first push rod (502) is installed. The first push rod (502) is movably installed through the pipette body (1) and is connected to the second push rod (7).

2. The pipette with a leak-proof structure according to claim 1, characterized in that: Inside the lower end of the second cavity (9), a connecting pipe (11) is installed through. The connecting pipe (11) is snap-connected to the tip (4). Inside the upper end of the pipette body (1), a groove (6) is provided. The button (2) and the second push rod (7) are movably installed inside the groove (6).

3. The pipette with a leak-proof structure according to claim 1, characterized in that: A spring (8) is sleeved and installed on the outer side of the rod body of the second push rod (7) located inside the groove (6). The spring (8) is in contact with the button (2) and the groove (6).

4. The pipette with a leak-proof structure according to claim 2, characterized in that: At one end inside the groove (6), a movable groove (503) is provided. The upper end of the first push rod (502) is movably installed through the movable groove (503). At the upper end of the rod body of the second push rod (7) located inside the groove (6), a transmission plate (501) is fixedly installed. The transmission plate (501) is movably installed inside the movable groove (503) and is in contact with the first push rod (502).

5. A pipette with a leak-proof structure according to claim 4, characterized in that: At one end inside the movable groove (503), a guiding groove (508) is provided through. Inside the guiding groove (508), a connecting block (507) is movably installed through. The connecting block (507) is connected to the first push rod (502).

6. The pipette with a leak-proof structure according to claim 1, wherein: A vent hole (506) is provided through between the lower end inside the first cavity (504) and the connecting pipe (11).

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