Pipetting amount suction head filter element capable of controlling suction amount

Abstract

The utility model discloses a pipetting amount suction head filter element capable of controlling suction amount, and relates to the technical field of suction head filter elements. One end of the transfer pipette is fixedly connected with a liquid inlet pipe, one end of the liquid inlet pipe is detachably connected with a suction head pipe, a filter element is arranged in the liquid inlet pipe, a piston seat is arranged in the transfer pipette, and two piston rods are movably inserted into one end, far away from the liquid inlet pipe, of the transfer pipette; according to the quantitative pipette disclosed by the utility model, the amount of liquid entering the pipette can be controlled by adjusting the height position of the limiting disc in the limiting assembly and adjusting the rising height of the piston seat, so that quantitative pipetting is conveniently realized, the convenience of quantitative pipetting is effectively improved, the suction head tube is detached from the bottom of the connecting sleeve, and the convenience of quantitative pipetting is improved. When the filter element is replaced, the filter element located below the upper positioning ring in the liquid inlet pipe can automatically fall off, and on the contrary, the filter element can be fixed below the upper positioning ring, so that the replacement of the filter element is conveniently realized, and the replacement convenience of the filter element is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of suction head filter core, specifically to a pipette volume suction head filter core of controllable suction volume. BACKGROUND

[0002] Suction head filter core is mainly used for liquid filter core, and the main role is filtration, which can effectively filter the input liquid to achieve the effect of output clean liquid. The filtering material has good adsorption performance, obvious filtering effect, uniform pore size, repeated washing, long service life and other advantages;

[0003] Suction head filter core is suitable for filtering process in petroleum, chemical industry, food, pharmaceutical, aviation, scientific research and other industries, and can also be used as an ideal tool for precise filtration in laboratory;

[0004] However, the suction head filter core in the prior art still has some defects:

[0005] The suction head filter core in the prior art has simple structure, and most of them cannot control the suction volume of liquid, which makes the quantitative pipetting operation more inconvenient. At the same time, the suction head filter core in the prior art cannot be conveniently disassembled, which makes the replacement of the filter core of the suction head filter core more inconvenient. UTILITY MODEL CONTENTS

[0006] In order to solve the above problems, the purpose of the utility model is to provide a pipette volume suction head filter core with controllable suction volume.

[0007] In order to solve the above technical problems, the utility model adopts the following technical scheme: a pipette volume suction head filter core with controllable suction volume, comprising a pipette, one end of the pipette is fixedly connected with a liquid inlet pipe, one end of the liquid inlet pipe is detachably connected with a suction head pipe, the inside of the liquid inlet pipe is provided with a filter core, the inside of the pipette is provided with a piston seat, the end of the pipette away from the liquid inlet pipe is movably inserted with two piston rods, one end of the two piston rods is fixedly connected with the upper end face of the piston seat, one end of the two piston rods is movably sleeved with an extension spring, one end of the two extension springs is fixedly connected with the upper end face of the piston seat, the other end of the two extension springs is fixedly connected with the top wall of the pipette.

[0008] A limiting assembly is arranged on the pipette, and a disassembly assembly is arranged between the liquid inlet pipe and the suction head pipe.

[0009] The limiting assembly comprises a limiting disc, the limiting disc is located above the piston seat, a lead screw is threadedly rotatably installed at the end of the pipette away from the liquid inlet pipe, and one end of the lead screw is fixedly connected with the upper surface of the limiting disc.

[0010] Preferably, the disassembly assembly comprises a connecting sleeve, an inner wall of the connecting sleeve is provided with an internal thread groove, one end of the liquid inlet pipe is provided with a first threaded column, one end of the suction head pipe is provided with a second threaded column, and the first threaded column and the second threaded column are in threaded connection with the internal thread groove.

[0011] Preferably, the disassembly assembly further comprises an upper positioning ring and a lower positioning ring, the upper positioning ring is fixedly installed on the inner wall of the liquid inlet pipe, and the lower positioning ring is fixedly installed on the inner wall of the suction head pipe.

[0012] Compared with the prior art, the utility model has the advantages that:

[0013] 1、 in the utility model, the height position of the limiting disc in the limiting assembly is adjusted, the height of the piston seat rising is adjusted, the amount of liquid entering the pipette is controlled, quantitative pipetting is conveniently realized, and the convenience of quantitative pipetting is effectively improved.

[0014] 2、 in the utility model, the filter core below the upper positioning ring in the liquid inlet pipe can automatically fall off by removing the suction head pipe from the bottom of the connecting sleeve, the filter core can be fixed below the upper positioning ring, the replacement of the filter core is conveniently realized, and the convenience of filter core replacement is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creating labor.

[0016] Figure 1 It is the whole structure schematic diagram of the utility model a control pipetting volume's pipetting volume suction head filter core.

[0017] Figure 2 It is the sectional structure schematic diagram of the utility model pipette.

[0018] Figure 3 It is the separation structure schematic diagram of the utility model suction head pipe and liquid inlet pipe and connecting sleeve.

[0019] Figure 4 It is the sectional structure schematic diagram of the utility model suction head pipe and liquid inlet pipe and connecting sleeve.

[0020] In the diagram: 1. Pipette; 11. Inlet tube; 12. Pipette tip; 13. Filter element; 14. Piston seat; 15. Rubber ring; 16. Piston rod; 17. Telescopic spring; 18. Pull handle; 2. Limiting assembly; 21. Limiting plate; 22. Lead screw; 23. Through slot; 24. Handle; 3. Assembly / disassembly assembly; 31. Connecting sleeve; 32. Internal threaded groove; 33. First threaded post; 34. Second threaded post; 35. Upper positioning ring; 36. Lower positioning ring; 37. Rubber pad. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Figures 1-4 As shown, this utility model provides a controllable volumetric pipette tip filter element, including a pipette 1, one end of which is fixedly connected to an inlet pipe 11, and the other end of the inlet pipe 11 is detachably connected to a pipette tip tube 12. A filter element 13 is disposed inside the inlet pipe 11, and a piston seat 14 is disposed inside the pipette 1. A rubber ring 15 is fixedly installed on the outer wall of the piston seat 14, and the outer wall of the rubber ring 15 is in movable contact with the inner wall of the pipette 1. Two piston rods 16 are movably inserted into the end of the pipette 1 away from the inlet pipe 11, one end of each piston rod 16 is fixedly connected to the upper end face of the piston seat 14, and a telescopic spring 17 is movably sleeved on one end of each piston rod 16. The piston rod 16 is fixedly connected to the upper end face of the piston seat 14, and the other ends of the two telescopic springs 17 are fixedly connected to the top wall of the pipette 1. By pushing the piston rod 16 vertically downward, the piston rod 16 can cause the piston seat 14 to descend to the bottom wall of the pipette 1. The piston seat 14 causes the telescopic springs 17 to extend. When the piston rod 16 is stopped from being pushed downward, the extension of the telescopic springs 17 can cause the piston seat 14 to rise and return to its original position. The piston seat 14 and the rubber ring 15 can draw liquid from the sample container through the liquid inlet tube 11 and the pipette tip tube 12 and draw the liquid into the pipette 1. The other ends of the two piston rods 16 are fixedly installed with pull handles 18. By setting pull handles 18, it is convenient for the operator to pull the piston rods 16 vertically upward.

[0023] The limiting assembly 2 is arranged on the pipette 1, and the limiting assembly 2 can limit the rising height of the piston seat 14, so as to control the liquid flow into the pipette 1, and facilitate the quantitative pipetting operation according to the detection operation requirements; the dismounting assembly 3 is arranged between the liquid inlet pipe 11 and the suction head pipe 12, and the dismounting assembly 3 facilitates the operation personnel to dismount the filter element 13, so as to facilitate the operation personnel to replace the filter element 13;

[0024] The limiting assembly 2 comprises a limiting disc 21, which is located above the piston seat 14; the rising height of the piston seat 14 can be controlled by adjusting the up-down position of the limiting disc 21 and controlling the distance between the limiting disc 21 and the piston seat 14; the lead screw 22 is threadedly rotatably arranged at the end of the pipette 1 away from the liquid inlet pipe 11, and one end of the lead screw 22 is fixedly connected to the upper surface of the limiting disc 21; the lead screw 22 can drive the limiting disc 21 to vertically ascend and descend by rotating the lead screw 22; the middle portion of the handle 18 is provided with a penetrating slot 23, and the lead screw 22 penetrates through the penetrating slot 23; the handle 24 is fixedly arranged at the end of the lead screw 22 away from the limiting disc 21; and the handle 24 facilitates the operation personnel to rotate the lead screw 22.

[0025] The dismounting assembly 3 comprises a connecting sleeve 31, an upper positioning ring 35 and a lower positioning ring 36; the inner wall of the connecting sleeve 31 is provided with an internal thread groove 32; one end of the liquid inlet pipe 11 is provided with a first threaded column 33; one end of the suction head pipe 12 is provided with a second threaded column 34; the first threaded column 33 and the second threaded column 34 are threadedly connected with the internal thread groove 32; the connecting sleeve 31, the internal thread groove 32, the first threaded column 33 and the second threaded column 34 are arranged in a threaded connection mode, so that the connecting sleeve 31 is connected with the liquid inlet pipe 11 and the suction head pipe 12; conversely, the suction head pipe 12 can be dismounted from the bottom end of the liquid inlet pipe 11; the upper positioning ring 35 is fixedly arranged on the inner wall of the liquid inlet pipe 11; the lower positioning ring 36 is fixedly arranged on the inner wall of the suction head pipe 12; the filter element 13 is located between the upper positioning ring 35 and the lower positioning ring 36; the lower surface of the upper positioning ring 35 and the upper surface of the lower positioning ring 36 are both fixedly provided with rubber pads 37; the end portion of the filter element 13 is movably contacted with one side of the rubber pad 37; the upper positioning ring 35 and the lower positioning ring 36 are arranged in a positioning mode through the rubber pads 37, so that the filter element 13 is positioned by the upper positioning ring 35 and the lower positioning ring 36, and the filter element 13 is fixed between the upper positioning ring 35 and the lower positioning ring 36.

[0026] Working principle: when quantitative pipetting is needed, the operator first manually rotates the handle 24, the handle 24 rotates the lead screw 22, the threaded rotation of the lead screw 22 makes the limiting disc 21 vertically descend, the descent of the limiting disc 21 pushes the piston seat 14 and the rubber ring 15 to synchronously descend, the descent of the piston seat 14 makes the two extension springs 17 stretch, and the space between the lower end surface of the piston seat 14 and the bottom wall of the pipette 1 meets the pipetting amount requirement;

[0027] Subsequently, the operator puts the suction head tube 12 into the sample container and pushes down the pull handle 18, the pull handle 18 makes the piston seat 14 and the rubber ring 15 vertically descend to the bottom wall of the pipette 1 through the two piston rods 16, the descent of the piston seat 14 makes the two extension springs 17 stretch, then the pull handle 18 is released, the two extension springs 17 contract, pull the piston seat 14 and the rubber ring 15 to vertically ascend, in the process of ascending, the piston seat 14 sucks the liquid in the sample container through the suction head tube 12 and the liquid inlet tube 11, the liquid is filtered by the filter element 13 and enters the inside of the pipette 1, thereby conveniently realizing quantitative pipetting, and effectively improving the convenience of quantitative pipetting;

[0028] When the filter element 13 needs to be replaced, the operator manually rotates the suction head tube 12 to make the second threaded column 34 disengage from the internal threaded groove 32, at this time, the filter element 13 located below the upper positioning ring 35 falls down from the bottom of the liquid inlet tube 11, then the replaced filter element 13 is placed below the upper positioning ring 35, and the suction head tube 12 is screwed at the bottom of the connecting sleeve 31, thereby conveniently realizing the replacement of the filter element 13, and effectively improving the convenience of replacing the filter element 13.

[0029] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A pipette tip filter cartridge for controlled volume pipetting, comprising a pipette (1), characterized in that: One end of the pipette (1) is fixedly connected with a liquid inlet pipe (11), one end of the liquid inlet pipe (11) is detachably connected with a suction head pipe (12), the inside of the liquid inlet pipe (11) is provided with a filter core (13), the inside of the pipette (1) is provided with a piston seat (14), the end of the pipette (1) away from the liquid inlet pipe (11) is movably inserted with two piston rods (16), one end of the two piston rods (16) is fixedly connected with the upper end surface of the piston seat (14), one end of the two piston rods (16) is movably sleeved with a telescopic spring (17), one end of the two telescopic springs (17) is fixedly connected with the upper end surface of the piston seat (14), the other end of the two telescopic springs (17) is fixedly connected with the top wall of the pipette (1). The pipette (1) is provided with a limiting assembly (2), and a dismounting assembly (3) is arranged between the liquid inlet pipe (11) and the suction head pipe (12). The limiting assembly (2) comprises a limiting disc (21), the limiting disc (21) is located above the piston seat (14), the end of the pipette (1) away from the liquid inlet pipe (11) is threadedly rotatably installed with a lead screw (22), one end of the lead screw (22) is fixedly connected with the upper surface of the limiting disc (21).

2. A filter cartridge for a pipette tip having a controlled volume, according to claim 1, wherein, The outer wall of the piston seat (14) is fixedly installed with a rubber ring (15), the outer wall of the rubber ring (15) and the inner wall of the pipette (1) movably contact.

3. A controlled volume pipette tip filter cartridge as in claim 1, wherein, The other end of the two piston rods (16) is fixedly installed with a pull handle (18).

4. A controlled volume pipette tip filter cartridge according to claim 3, wherein, The middle part of the pull handle (18) is provided with a penetrating slot (23), and the lead screw (22) penetrates the penetrating slot (23).

5. A controlled volume pipette tip filter cartridge according to claim 1 wherein, The end of the lead screw (22) away from the limiting disc (21) is fixedly installed with a handle (24).

6. A controlled volume pipette tip filter cartridge as in claim 1, wherein, The dismounting assembly (3) comprises a connecting sleeve (31), the inner wall of the connecting sleeve (31) is provided with an internal thread groove (32), one end of the liquid inlet pipe (11) is provided with a first threaded column (33), one end of the suction head pipe (12) is provided with a second threaded column (34), and the first threaded column (33) and the second threaded column (34) are threadedly connected with the internal thread groove (32).

7. A controlled volume pipette tip filter cartridge according to claim 1 wherein, The dismounting assembly (3) further comprises an upper positioning ring (35) and a lower positioning ring (36), the upper positioning ring (35) is fixedly installed on the inner wall of the liquid inlet pipe (11), and the lower positioning ring (36) is fixedly installed on the inner wall of the suction head pipe (12), and the filter core (13) is located between the upper positioning ring (35) and the lower positioning ring (36).

8. A controlled volume pipette tip filter cartridge as in claim 7, wherein, The lower surface of the upper positioning ring (35) and the upper surface of the lower positioning ring (36) are both fixedly installed with a rubber pad (37), and the end of the filter core (13) and one side of the rubber pad (37) movably contact.

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