Three-channel pipette

Abstract

The utility model discloses a three-channel pipette, and relates to the technical field of pipettes, the three-channel pipette comprises a gun barrel, a negative pressure liquid suction assembly and three groups of quantitative liquid suction structures, and the three groups of quantitative liquid suction structures can suck liquid with different volumes. According to the three-channel pipette, three specifications of negative pressure containers, namely quantitative tubes, are directly arranged in the three-channel pipette, the three negative pressure containers can be switched by rotating and adjusting the angle of the bottom cover, and negative pressure suction is performed after switching, so that liquids with different volumes can be accurately extracted; according to the mode, firstly, the tedious operation that a user needs to frequently replace the pipette head due to different measured liquids can be solved, the economic cost is saved, the three-channel measuring range pipettor is more convenient and faster in the aspects of maintenance and calibration, and the cost is saved; especially in some laboratories with limited expenditure, the three-channel measuring range pipettor of the device can basically meet all experiment requirements, and various massive or precise sample adding requirements can be met. Time and labor cost are saved, and experiment operation efficiency is greatly improved.

Description

TECHNICAL FIELD

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

[0002] Pipettes usually work using the principle of air displacement. By pressing or rotating a button, the user can draw air into or expel air from the head of the pipette, thereby creating or eliminating a pressure differential that is used to draw or release liquid. There are many different brands and models of pipettes available on the market. The advantages of current pipettes include:

[0003] 1. High accuracy: Pipettes can accurately measure and transfer small volumes of liquid, which is crucial for experiments that require precise control over reagent volumes.

[0004] 2. Easy to operate: Pipettes are designed to be relatively lightweight and easy to operate with one hand, and many models offer adjustable volume settings, allowing users to easily adapt to different experimental needs.

[0005] 3. Good repeatability: Pipettes generally have good repeatability, meaning that under the same conditions, multiple measurements of the same volume of liquid will yield consistent results.

[0006] 4. Wide range of applications: Pipettes have a wide range of volume ranges, from less than 1 microliter to several milliliters, making them suitable for a variety of biological experiments.

[0007] However, the existing pipettes still have the following shortcomings:

[0008] 1. High usage cost: Although the price of the pipette itself may not be expensive, in large-scale, high-throughput experiments, operators need to constantly use pipettes to transfer liquids, which may lead to an increase in overall usage cost.

[0009] 2. Different experiments require different pipette ranges, so for complex experiments with multiple sample volumes, pipettes need to be frequently replaced; when multiple people are doing experiments in the laboratory at the same time, there may be a shortage of pipettes. INVENTION CONTENT

[0010] In view of the shortcomings of the prior art, the utility model provides a three -way pipette, which solves the shortcomings of the existing pipette.

[0011] To achieve the above purpose, the utility model realizes the following technical scheme: a three -way pipette, including gun barrel, and the bottom end center of gun barrel is provided with gun head pipe, still including:

[0012] Negative pressure liquid suction assembly, with gun barrel inside middle fixed connection and with gun barrel coaxial arrangement, through press negative pressure and take in liquid;

[0013] Three groups of quantitative liquid suction structures are arranged around the periphery of the negative pressure liquid suction assembly, and the three groups of quantitative liquid suction structures can suck different capacities of liquid;

[0014] Three groups of guide sleeves are arranged on the inner wall of the barrel for guiding the axial movement of the quantitative liquid suction structures;

[0015] The bottom end of the barrel is sealed by a sealing ring and a rotating sleeve, and the bottom end of the barrel is provided with a barrel head pipe. By rotating the bottom cover, the barrel head pipe is moved to below one of the quantitative liquid suction structures. Then, the bottom end of the different quantitative liquid suction structures is inserted into the barrel head pipe and seals the barrel head pipe. When the space below the negative pressure liquid suction assembly generates negative pressure, the quantitative liquid suction structure located in the barrel head pipe sucks liquid. The three bottom ends of the barrel are provided with indicating marks for indicating the position of the barrel head pipe.

[0016] Preferably, the negative pressure liquid suction assembly comprises:

[0017] A flange is fixedly connected to the middle of the inner part of the barrel;

[0018] A negative pressure pipe is coaxially fixed to the top of the flange, and the center of the flange is hollow on the inside of the negative pressure pipe;

[0019] A first piston is slidingly connected to the inside of the negative pressure pipe;

[0020] A pressing rod is fixedly connected to the top of the first piston for pressing the first piston downward;

[0021] A first elastic member is elastically abutted between the first piston and the flange for upwardly resetting the first piston after being pressed downward.

[0022] Preferably, the quantitative liquid suction structure comprises:

[0023] A quantitative pipe is in the form of a needle pipe, and the outer diameter of the bottom end is smaller than the inner diameter of the barrel head pipe. The length of the quantitative pipe is greater than the length of the barrel head pipe, so that the bottom end of the quantitative pipe can be inserted into the barrel head pipe and can be extended from the bottom. A guide sleeve is sleeved on the outside of the quantitative pipe to limit the quantitative pipe to only axially slide;

[0024] A second piston is slidingly arranged in the inside of the quantitative pipe;

[0025] A positioning ring is arranged on the inner wall of the quantitative pipe and above the second piston. The heights of the positioning rings of the three groups of quantitative liquid suction structures are different, so that the distances of the second piston sliding upward are different, so as to extract different capacities of liquid;

[0026] A sealing ring is fixedly sleeved on the outside of the bottom end of the quantitative pipe for sealing the barrel head pipe.

[0027] Preferably, the top end of the dosing tube is connected with a slide rod through a connecting rod, the slide rod slides through a flange, the inside of the flange is penetrated with a sealing rubber sleeve which is sleeved outside the slide rod, the top end of the slide rod is thickened, a second elastic member is sleeved outside the slide rod between the thickened segment and the flange for resetting the dosing tube, the top end of the slide rod is fixed with a clamping structure which is clamped with the barrel to limit the height of the dosing tube.

[0028] Preferably, the clamping structure comprises a spring sheet connected to the top end of the slide rod, the top end of the spring sheet is outwardly bent, the bottom of the bent part is wedge-shaped, and a push rod is protruded in the middle of the bent part of the spring sheet, the spring sheet is bent and slid down by pushing the push rod.

[0029] Preferably, the side of the barrel is provided with an I-shaped groove, the horizontal segment of the I-shaped groove is adapted to the width of the spring sheet, and the vertical segment of the I-shaped groove is adapted to the push rod.

[0030] Preferably, the top end of the barrel is threadedly connected with a top cover, the pressing rod slides through the top cover and is provided with a pressing cap at the top end.

[0031] The utility model provides a three -channel pipette. Compared with prior art has the following beneficial effects:

[0032] 1. The three -channel pipette, directly built -in three kinds of specifications negative pressure container namely dosing tube, through rotating and adjusting the bottom cover angle can carry out the switching of three negative pressure containers, after switching, carry out negative pressure suction, can accurately draw different capacity liquid, this mode can solve the tedious operation of user because of the different liquid measurement needs frequent change gun head first, and saves the economic cost, three -channel range pipette is more convenient and fast in maintenance and calibration aspect, saves the cost, especially in some limited laboratory, the three -channel range pipette of the device can basically satisfy all experimental demand, completes various large or precision sample adding requirement. Save time and labor cost, greatly improve the experimental operation efficiency.

[0033] 2. The three -channel pipette, the restriction of the spring sheet bent part by the upper and lower horizontal segments of the I-shaped groove can limit the negative pressure liquid suction assembly at different heights, when clamped in the lower layer, the spring back of the second elastic member can avoid the negative pressure liquid suction assembly from sliding off the barrel, the push rod can make the spring sheet bent part separate from the I-shaped groove by pressing, and on the other hand, it can also slide down to drive the dosing liquid suction structure to slide down as a whole, so that it is inserted into the barrel, which is simple and convenient to operate. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a top view of the utility model structure;

[0035] Figure 2 It is a bottom view of the utility model structure;

[0036] Figure 3 It is the sectional view of the utility model structure;

[0037] Figure 4 It is the top view of the guide sleeve and the quantitative tube layout of the utility model;

[0038] Figure 5 It is the schematic diagram of the 10 μl quantitative tube internal structure of the utility model;

[0039] Figure 6 It is the schematic diagram of the 20 μl quantitative tube internal structure of the utility model;

[0040] Figure 7 It is the schematic diagram of the 100 μl quantitative tube internal structure of the utility model;

[0041] Figure 8 It is the sectional view of the negative pressure liquid suction assembly of the utility model.

[0042] In the figure: 1 - gun barrel, 11 - gun head pipe, 12 - top cover, 13 - I -slot, 14 - guide sleeve, 15 - bottom cover;2 - negative pressure liquid suction assembly, 21 - flange, 22 - negative pressure pipe, 23 - first piston, 24 - pressing rod, 25 - first elastic piece;

[0043] 3 - quantitative liquid suction structure, 31 - quantitative tube, 32 - second piston, 33 - positioning ring, 34 - sealing ring, 35 - connecting rod, 36 - sliding rod, 37 - sealing rubber sleeve, 38 - second elastic piece, 39 - spring piece, 310 - push rod. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0045] Referring to Figures 1-8 , the utility model provides the following two technical schemes:

[0046] The first implementation: a three-channel pipette, including gun barrel 1, still including:

[0047] Negative pressure liquid suction assembly 2, with gun barrel 1 inside middle fixed connection and with gun barrel 1 coaxial arrangement, through the pressurization negative pressure and carry out the liquid suction of liquid;

[0048] Three groups of quantitative liquid suction structures 3 are evenly distributed on the periphery of the negative pressure liquid suction assembly 2, and the three groups of quantitative liquid suction structures 3 can suck different capacities of liquid;

[0049] Three groups of guide sleeves 14 are arranged on the inner wall of the barrel 1 and are used to guide the axial movement of the quantitative liquid suction structure 3.

[0050] The bottom end of the barrel 1 is provided with a bottom cover 15 through a sealing ring and a rotating sleeve, the bottom of the bottom cover 15 is provided with a gun head pipe 11, the gun head pipe 11 is moved to below one of the quantitative liquid suction structures 3 by rotating the bottom cover 15, then the bottom end of the different quantitative liquid suction structures 3 is inserted into the gun head pipe 11 and seals the gun head pipe 11, so that when the space below the negative pressure liquid suction assembly 2 generates negative pressure, the liquid is sucked through the quantitative liquid suction structure 3 located in the gun head pipe 11, and the three bottom ends of the barrel 1 are provided with indicating marks for indicating the position of the gun head pipe 11.

[0051] In this embodiment, the negative pressure liquid suction assembly 2 comprises:

[0052] A flange 21 is fixedly connected to the middle of the inside of the barrel 1.

[0053] A negative pressure pipe 22 is coaxially fixed to the top of the flange 21, the center of the flange 21 is hollow inside the negative pressure pipe 22, the hollow setting can maintain ventilation on the one hand and support the second elastic member 38 on the other hand.

[0054] A first piston 23 is slidingly connected to the inside of the negative pressure pipe 22.

[0055] A pressing rod 24 is fixedly connected to the top of the first piston 23 and is used to press down the first piston 23, a top cover 12 is threadedly connected to the top end of the barrel 1, the pressing rod 24 slidingly penetrates the top cover 12 and is provided with a pressing cap at the top end, the pressing cap is connected in a threaded connection, sleeve connection or adhesive connection manner, which is convenient for disassembly.

[0056] A first elastic member 25 is elastically abutted between the first piston 23 and the flange 21 and is used to reset the pressed first piston 23, and the first elastic member 25 is a spring.

[0057] In this embodiment, the quantitative liquid suction structure 3 comprises:

[0058] A quantitative pipe 31 is in the form of a needle pipe and has an outer diameter smaller than the inner diameter of the gun head pipe 11 at the bottom end, the length of the quantitative pipe 31 is greater than the length of the gun head pipe 11, so that the bottom end of the quantitative pipe 31 can be inserted into the gun head pipe 11 and can be extended from the bottom, and after being extended, the gun head can be sleeved to suck liquid, and the guide sleeve 14 is sleeved outside the quantitative pipe 31 to limit the quantitative pipe 31 to be axially slid only.

[0059] A second piston 32 is slidingly arranged inside the quantitative pipe 31.

[0060] A positioning ring 33 is arranged on the inner wall of the dosing tube 31 and above the second piston 32. The three sets of positioning rings 33 of the dosing liquid suction structure 3 have different heights, so that the second piston 32 slides different distances to extract different amounts of liquid. The spaces for the second piston 32 to slide in the three dosing tubes 31 are 10 μl, 20 μl and 100 μl respectively. In order to distinguish the capacities of the three sets of dosing liquid suction structure 3, numbers are marked below the three I-shaped grooves 13.

[0061] A sealing ring 34 is fixedly arranged on the outer side of the bottom end of the dosing tube 31 to seal the gun barrel 11.

[0062] The top end of the dosing tube 31 is connected with a sliding rod 36 through a connecting rod 35. The connecting rod 35 is fixed to the bottom end of the sliding rod 36 to form an inverted T-shaped structure. The sliding rod 36 slides through the flange 21. The inside of the flange 21 penetrates a sealing rubber sleeve 37 arranged outside the sliding rod 36. The top end of the sliding rod 36 is thickened. A second elastic member 38 is arranged outside the sliding rod 36 and between the thickened segment and the flange 21 to reset the dosing tube 31. The second elastic member 38 is a spring. The top end of the sliding rod 36 is fixed with a clamping structure which is clamped with the gun barrel 1 to limit the height of the dosing tube 31.

[0063] The device directly embeds three negative pressure containers, i.e. the dosing tube 31. By rotating the adjusting bottom cover 15 to adjust the angle, the three negative pressure containers can be switched. After switching, the negative pressure suction is performed, so that different amounts of liquid can be accurately extracted. This method can solve the cumbersome operation of frequent gun head replacement due to different liquid measurement. It saves economic cost. The three-channel range pipette is more convenient and fast in maintenance and calibration, and saves cost. Especially in some laboratories with limited funds, the three-channel range pipette of the device can basically meet all experimental requirements, complete various large or precise sample addition requirements, save time and labor cost, and greatly improve the experimental operation efficiency.

[0064] The second embodiment is mainly different from the first embodiment in that the clamping structure includes a spring sheet 39 connected to the top end of the sliding rod 36. The top end of the spring sheet 39 is outwardly bent. The bottom of the bent part is wedge-shaped. A push rod 310 is protrudingly arranged in the middle of the bent part of the spring sheet 39. The push rod 310 is pushed to bend and slide down the spring sheet 39.

[0065] The side of the gun barrel 1 is provided with an I-shaped groove 13. The horizontal segment of the I-shaped groove 13 is adapted to the width of the spring sheet 39. The vertical segment of the I-shaped groove 13 is adapted to the width of the push rod 310.

[0066] The restriction of the negative pressure liquid suction assembly 2 at different heights by the upper and lower horizontal sections of the I-shaped groove 13 can avoid the rebound of the second elastic member to make the negative pressure liquid suction assembly 2 slide off the gun head pipe 11, and the push rod 310 can make the bent part of the elastic piece 39 disengage from the I-shaped groove 13 by pressing, and can also slide down to drive the quantitative liquid suction structure 3 to slide down as a whole, so that the quantitative liquid suction structure 3 is inserted into the gun head pipe 11, and the operation is simple and convenient.

[0067] Meanwhile, the contents not described in detail in the specification all belong to the prior art known to those skilled in the art.

[0068] In use, the quantitative liquid suction structure 3 corresponding to the required capacity is found first, the push rod 310 is pressed inward to make the elastic piece 39 bend to disengage from the I-shaped groove 13, then the push rod 310 is slid down to push the slide rod 36 through the elastic piece 39, at this time the quantitative pipe 31 is pushed down by the connecting rod 35 to make the bottom end slide into the gun head pipe 11, and the sealing ring 34 is pressed into the gun head pipe 11 for sealing, the push rod 310 is released after being pressed to the bottom, at this time the elastic piece 39 rebounds to be inserted into the lower horizontal section of the I-shaped groove 13 and is clamped to limit the upward rebound of the quantitative liquid suction structure 3;

[0069] At this time, the bottom end of the quantitative pipe 31 extends out of the gun head pipe 11, and the gun head can be sleeved for liquid suction operation;

[0070] In liquid suction, the pressing rod 24 is first pressed down to push the first piston 23 to slide down, because the bottom end of the gun barrel 1, i.e. the gun head pipe 11, is blocked by the quantitative pipe 31, and the quantitative pipe 31 is isolated by the second piston 32, so that a closed space is formed in the lower layer of the negative pressure liquid suction assembly 2, and the second piston 32 is pressed down by the first piston 23 when the first piston 23 slides down, at this time the gun head is inserted into the liquid, and the pressing rod 24 is released, the first piston 23 rebounds upward under the elastic force of the first elastic member 25, and then the second piston 32 is pulled upward by the negative pressure, and then the air in the gun head is sucked by the negative pressure in the quantitative pipe 31, and then the liquid is sucked into the gun head, so that the liquid can be transferred.

[0071] It should be noted that in this document, the terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0072] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A three-channel pipette, comprising a barrel, characterized in that: Also includes: The negative pressure liquid suction component is fixedly connected to the inside of the barrel and is coaxially arranged with the barrel. It draws liquid by generating negative pressure through pressing. Three sets of quantitative liquid absorption structures are evenly distributed around the negative pressure liquid absorption component, and the three sets of quantitative liquid absorption structures can absorb different amounts of liquid. Three sets of guide sleeves are installed on the inner wall of the barrel to guide the quantitative liquid aspiration structure to move axially. The bottom end of the barrel is sealed by a sealing ring and a bottom cover is rotatably fitted. The bottom of the bottom cover is provided with a nozzle tube. By rotating the bottom cover, the nozzle tube is moved to the bottom of one of the quantitative liquid absorption structures. Then, the bottom ends of different quantitative liquid absorption structures are inserted into the nozzle tube and the nozzle tube is sealed. When a negative pressure is generated in the space below the negative pressure liquid absorption assembly, liquid is absorbed through the quantitative liquid absorption structure located in the nozzle tube.

2. A three-channel pipette according to claim 1, characterized in that: The negative pressure liquid absorption assembly includes: The flange is fixedly connected to the inside of the gun barrel in the middle; A negative pressure pipe is coaxially fixed to the top of the flange, and the flange is hollowed out at the center and inside the negative pressure pipe. The first piston is slidably connected inside the negative pressure tube; The pressing rod is fixedly connected to the top of the first piston for pressing down the first piston; The first elastic element is elastically abutted between the first piston and the flange to spring back and reset the first piston after it has been pressed down.

3. A three-channel pipette according to claim 2, characterized in that: The quantitative liquid aspiration structure includes: The quantitative tube is needle-shaped with an outer diameter at the bottom end smaller than the inner diameter of the nozzle tube. The length of the quantitative tube is greater than the length of the nozzle tube, so that the bottom end of the quantitative tube can be inserted into the nozzle tube and then protrude from the bottom. A guide sleeve is fitted on the outside of the quantitative tube to restrict the quantitative tube to slide only axially. The second piston is slidably disposed inside the metering tube; The positioning ring is set on the inner wall of the metering tube and located above the second piston. The positioning rings of the three sets of metering liquid aspiration structures are at different heights, so that the second piston slides up a different distance to draw liquid of different volumes. The sealing ring is fixedly sleeved on the outside of the bottom end of the metering tube to seal the nozzle tube.

4. A three-channel pipette according to claim 3, characterized in that: The top end of the metering tube is connected to a slide rod via a connecting rod. The slide rod slides through the flange, and a sealing sleeve is fitted over the slide rod inside the flange. The top end of the slide rod is thickened. A second elastic element is fitted over the slide rod and between the thickened section and the flange for loading and resetting the metering tube. The top end of the slide rod is fixed with a locking structure that engages with the gun barrel to limit the height of the metering tube.

5. A three-channel pipette according to claim 4, characterized in that: The snap-fit ​​structure includes a spring piece connected to the top of the slide rod. The top of the spring piece is bent outward, and the bottom of the bent part is set as a wedge-shaped surface. A push rod is protruding in the middle of the bent part of the spring piece. By pushing the push rod, the spring piece is pushed to bend and slide down.

6. A three-channel pipette according to claim 5, characterized in that: The barrel has an I-shaped groove on its side. The width of the horizontal section of the I-shaped groove is adapted to the width of the shrapnel, and the width of the vertical section of the I-shaped groove is adapted to the push rod.

7. A three-channel pipette according to claim 2, characterized in that: The top of the barrel is threadedly connected to a top cover, and the pressing rod slides through the top cover and has a pressure cap at its top.

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