Quick switching type three-channel quantitative pipette

Abstract

The invention discloses a rapid switching type three-channel quantitative pipette, and relates to the technical field of pipettes, the rapid switching type three-channel quantitative pipette comprises a gun barrel, a gun head tube is arranged in the center of the bottom end of the gun barrel, and the rapid switching type three-channel quantitative pipette further comprises a negative pressure liquid suction assembly and three quantitative liquid suction structures. According to the rapid switching type three-channel quantitative pipette, three specifications of negative pressure containers, namely quantitative tubes, are directly arranged in the rapid switching type three-channel quantitative pipette, the three negative pressure containers are switched by adopting a mode similar to a multicolor ball-point pen, 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.

Description

Technical Field

[0001] The invention relates to the technical field of liquid transfer guns, in particular to a fast-switching three-channel quantitative liquid transfer gun. Background Art

[0002] Pipettes typically work using the air displacement principle. By pressing or turning a button, the user can draw air into or out of the pipette head, creating or eliminating a pressure differential that is used to draw in 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 precision: The pipette can accurately measure and transfer tiny amounts of liquid, which is essential for experiments that require precise control of reagent dosage.

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

[0005] 3. Good repeatability: Pipette guns usually have good repeatability, which means that when the same amount of liquid is measured multiple times under the same conditions, the results obtained are highly consistent.

[0006] 4. Wide range of applications: The capacity of the pipette ranges widely, from less than 1 microliter to several milliliters, and is suitable for various biological experiments.

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

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

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

[0010] In view of the deficiencies in the prior art, the present invention provides a fast-switching three-channel quantitative pipette, which solves the deficiencies of the prior art pipettes.

[0011] To achieve the above objectives, the present invention is implemented through the following technical solutions: a fast-switching three-channel quantitative pipette gun, comprising a gun barrel, and a gun head tube is arranged at the center of the bottom end of the gun barrel, and also includes:

[0012] The negative pressure liquid suction component is fixedly connected to the middle of the gun barrel and is coaxially arranged with the gun barrel, and generates negative pressure by pressing to suck the liquid;

[0013] Three groups of quantitative liquid suction structures are evenly distributed on the periphery of the negative pressure liquid suction component, and the three groups of quantitative liquid suction structures can absorb different capacities of liquid. By inserting the bottom ends of different quantitative liquid suction structures into the gun head tube and sealing the gun head tube, when negative pressure is generated in the space below the negative pressure liquid suction component, liquid is sucked through the quantitative liquid suction structure located in the gun head tube, and a limiting structure is provided on the gun tube to limit the downward movement of the quantitative liquid suction structure to prevent it from being reset due to accidental touch;

[0014] Three groups of guide plates are arranged at the bottom of the inner cavity of the gun barrel and are staggered with the three groups of quantitative liquid suction structures to guide the quantitative liquid suction structures to move radially.

[0015] Preferably, the negative pressure liquid suction component comprises:

[0016] A flange, fixedly connected to the middle of the barrel;

[0017] The negative pressure tube is coaxially fixed to the top of the flange, and the center of the flange is hollowed out inside the negative pressure tube;

[0018] A first piston is slidably connected to the inside of the negative pressure tube;

[0019] A pressing rod, fixedly connected to the top of the first piston and used to press the first piston downward;

[0020] The first elastic member is elastically abutted between the first piston and the flange to rebound and reset the first piston after being pressed downward.

[0021] Preferably, the quantitative liquid absorption structure comprises:

[0022] The quantitative tube is in the shape of a needle tube and the outer diameter of the bottom end is smaller than the inner diameter of the gun head tube. The length of the quantitative tube is greater than the length of the gun head tube, so that the bottom end of the quantitative tube can be extended from the bottom after being inserted into the gun head tube;

[0023] A second piston is slidably disposed inside the quantitative tube;

[0024] The positioning ring is arranged on the inner wall of the quantitative tube and is located above the second piston. The positioning rings of the three sets of quantitative liquid suction structures have different heights so that the second piston slides up at different distances to extract liquids of different capacities.

[0025] The sealing ring is fixedly sleeved on the outer side of the bottom end of the quantitative tube and is used to seal the gun head tube.

[0026] Preferably, the top end of the quantitative tube is rotatably connected to a sliding rod through a connecting rod, the sliding rod slides through a flange, the interior of the flange penetrates a sealing rubber sleeve mounted on the outside of the sliding rod, the top end of the sliding rod is thickened, a second elastic member is mounted on the outside of the sliding rod and located between the thickened section and the flange for springing up and resetting the quantitative tube, and the top end of the sliding rod is fixed with a clamping structure that engages with the gun barrel to limit the height of the quantitative tube.

[0027] Preferably, the clamping structure includes a spring sheet connected to the top of the sliding rod, the top of the spring sheet 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 sheet, and the front section of the push rod is set as a sliding structure, which pushes the sliding structure to push the spring sheet to bend and slide down.

[0028] Preferably, an I-shaped groove is provided on the side of the gun barrel, the horizontal section width of the I-shaped groove is adapted to the width of the spring piece, and the vertical section width of the I-shaped groove is adapted to the push rod.

[0029] Preferably, the limiting structure includes a sliding sleeve arranged on the outside of the barrel and a limiting sleeve located below the I-slot, the inner wall of the limiting sleeve and the outer wall of the barrel are respectively provided with an upper convex ring and a lower convex ring, and a third elastic member is abutted between the upper convex ring and the lower convex ring, and the limiting sleeve is inserted between the slide and the barrel by the third elastic member bouncing the upper convex ring to limit the slide from being pushed into the barrel.

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

[0031] The present invention provides a fast-switching three-channel quantitative pipette. Compared with the prior art, it has the following beneficial effects:

[0032] 1. The quick-switching three-channel quantitative pipette gun has three specifications of negative pressure containers, namely quantitative tubes, built directly, and uses a multi-color ballpoint pen to switch the three negative pressure containers. After switching, negative pressure absorption is performed to accurately extract liquids of different volumes. This method can first solve the cumbersome operation of users frequently changing gun heads due to different liquid measurements, and save economic costs. The three-channel range pipette is also more convenient and cost-saving in maintenance and calibration; especially in some laboratories with limited funds, the three-channel range pipette of this device can basically meet all experimental needs and complete various large-scale or precise sample addition requirements. Save time and labor costs, and greatly improve experimental operation efficiency.

[0033] 2. The quick-switching three-channel quantitative pipette gun can limit the negative pressure liquid suction component to different heights by limiting the bent part of the spring piece by the upper and lower horizontal sections of the I-shaped groove. When stuck in the lower layer, the second elastic member can be prevented from rebounding and causing the negative pressure liquid suction component to slide up and detach from the gun head tube. The push rod can, on the one hand, press the bent part of the spring piece out of the I-shaped groove, and on the other hand, it can slide down to drive the quantitative liquid suction structure to slide down as a whole, so that it moves to the center and is inserted into the gun head tube. The operation is simple and convenient. The limiting structure can also avoid accidentally pressing the slide and causing the quantitative liquid suction structure to rebound and reset, making it more stable to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A top perspective view of the structure of the present invention;

[0035] Figure 2 A bottom perspective view of the structure of the present invention;

[0036] Figure 3 is a cutaway perspective view of the structure of the present invention;

[0037] Figure 4 A top view of the layout of the guide plate and the quantitative tube of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure inside the 10 μl quantitative tube of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure inside the 20 μl quantitative tube of the present invention;

[0040] Figure 7 This is a schematic diagram of the structure inside the 100 μl quantitative tube of the present invention;

[0041] Figure 8 is a sectional stereoscopic view of the negative pressure liquid absorption assembly of the present invention;

[0042] Fig. 9 It is a cross-sectional view of the limiting structure and the gun barrel of the present invention.

[0043] In the figure: 1-gun barrel, 11-gun head tube, 12-top cover, 13-I-slot, 14-guide plate;

[0044] 2-negative pressure liquid suction assembly, 21-flange, 22-negative pressure tube, 23-first piston, 24-pressing rod, 25-first elastic member;

[0045] 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 member, 39- shrapnel, 310- push rod;

[0046] 4-limiting structure, 41-limiting sleeve, 42-upper convex ring, 43-lower convex ring, 44-third elastic member. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figure 1-Figure 9 , the present invention provides the following two technical solutions:

[0049] The first embodiment: a fast-switching three-channel quantitative pipette gun, comprising a barrel 1, a gun head tube 11 is arranged at the center of the bottom end of the barrel 1, and the bottom of the barrel 1 is arranged in a conical shape, and further comprising:

[0050] The negative pressure liquid suction component 2 is fixedly connected to the middle of the gun barrel 1 and is coaxially arranged with the gun barrel 1, and generates negative pressure by pressing to suck liquid;

[0051] Three groups of quantitative liquid absorption structures 3 are evenly distributed on the periphery of the negative pressure liquid absorption component 2, and the three groups of quantitative liquid absorption structures 3 can absorb different capacities of liquid. By inserting the bottom ends of different quantitative liquid absorption structures 3 into the gun head tube 11 and sealing the gun head tube 11, when negative pressure is generated in the space below the negative pressure liquid absorption component 2, liquid is absorbed through the quantitative liquid absorption structures 3 located in the gun head tube 11, and the gun barrel 1 is provided with a limiting structure for limiting the downward movement of the quantitative liquid absorption structure 3 to prevent it from being reset due to accidental touch;

[0052] Three groups of guide plates 14 are arranged at the bottom of the inner cavity of the gun barrel 1 and are staggered with the three groups of quantitative liquid aspiration structures 3 to guide the quantitative liquid aspiration structures 3 to move radially.

[0053] In this embodiment, the negative pressure liquid suction component 2 includes:

[0054] The flange 21 is fixedly connected to the middle of the barrel 1;

[0055] The negative pressure tube 22 is coaxially fixed to the top of the flange 21. The center of the flange 21 and the inner side of the negative pressure tube 22 are hollowed out. The hollowing out can maintain ventilation on the one hand and support the second elastic member 38 on the other hand.

[0056] The first piston 23 is slidably connected to the inside of the negative pressure tube 22;

[0057] The pressing rod 24 is fixedly connected to the top of the first piston 23 and is used to press the first piston 23 downward. The top of the barrel 1 is threadedly connected to the top cover 12. The pressing rod 24 slides through the top cover 12 and is provided with a pressing cap on the top. The pressing cap is connected by threading, sleeve connection or bonding, which is easy to disassemble.

[0058] The first elastic member 25 is elastically abutted between the first piston 23 and the flange 21 to bounce the first piston 23 upward after being pressed down; the first elastic member 25 is a spring.

[0059] In this embodiment, the quantitative liquid absorption structure 3 includes:

[0060] The quantitative tube 31 is in the shape of a needle tube and has a bottom outer diameter smaller than the inner diameter of the gun head tube 11. The length of the quantitative tube 31 is greater than the length of the gun head tube 11, so that the bottom end of the quantitative tube 31 can be extended from the bottom after being inserted into the gun head tube 11, and after being extended, the gun head can be put on to absorb the liquid;

[0061] The second piston 32 is slidably disposed inside the metering tube 31;

[0062] The positioning ring 33 is arranged on the inner wall of the quantitative pipette 31 and is located above the second piston 32. The positioning rings 33 of the three sets of quantitative liquid aspiration structures 3 have different heights so that the second piston 32 slides up to different distances to extract liquids of different capacities. The sliding spaces of the second piston 32 in the three quantitative pipettes 31 are 10μl, 20μl, and 100μl, respectively. In order to distinguish the capacities of the three sets of quantitative liquid aspiration structures 3, corresponding numbers are marked under the three I-shaped grooves 13;

[0063] The sealing ring 34 is fixedly sleeved on the outer side of the bottom end of the quantitative tube 31 to seal the gun head tube 11.

[0064] The top of the quantitative tube 31 is rotatably connected to a slide bar 36 through a connecting rod 35. The slide bar 36 slides through the flange 21. The interior of the flange 21 penetrates a sealing rubber sleeve 37 which is sleeved on the outside of the slide bar 36. The top of the slide bar 36 is thickened. A second elastic member 38 is sleeved on the outside of the slide bar 36 and located between the thickened section and the flange 21. The second elastic member 38 is a spring. A clamping structure that engages with the barrel 1 to limit the height of the quantitative tube 31 is fixed to the top of the slide bar 36, and a limiting structure 4 that limits the rebound of the clamping structure is axially slidably provided on the outside of the barrel 1.

[0065] The device directly has three specifications of negative pressure containers, namely quantitative tubes 31, built in, and uses a multi-color ballpoint pen-like method to switch the three negative pressure containers. After switching, negative pressure suction is performed to accurately extract liquids of different volumes. This method can first solve the cumbersome operation of users frequently changing gun tips due to different liquid measurements, and saves economic costs. The three-channel range pipette is also more convenient and cost-effective in maintenance and calibration. Especially in some laboratories with limited funds, the three-channel range pipette of the device can basically meet all experimental needs, complete various large-scale or precise sample addition requirements, save time and labor costs, and greatly improve experimental operation efficiency.

[0066] The second embodiment is mainly different from the first embodiment in that the clamping structure includes a spring sheet 39 connected to the top of the sliding rod 36, the top of the spring sheet 39 is bent outward, and the bottom of the bent part is set as a wedge-shaped surface, a push rod 310 is protruding in the middle of the bent part of the spring sheet 39, and the front section of the push rod 310 is set as a sliding structure, and the spring sheet 39 is pushed to bend and slide down by pushing the sliding structure.

[0067] An I-shaped groove 13 is provided on the side of the gun barrel 1 , the horizontal width of the I-shaped groove 13 is adapted to the width of the spring piece 39 , and the vertical width of the I-shaped groove 13 is adapted to the push rod 310 .

[0068] The limiting structure 4 includes a limiting sleeve 41 which is arranged on the outside of the barrel 1 and is located below the I-slot 13. The inner wall of the limiting sleeve 41 and the outer wall of the barrel 1 are respectively provided with an upper convex ring 42 and a lower convex ring 43, and a third elastic member 44 is abutted between the upper convex ring 42 and the lower convex ring 43. The third elastic member 44 is a spring. The upper convex ring 42 is bounced up by the third elastic member 44 so that the limiting sleeve 41 is inserted between the slide and the barrel 1 to limit the slide from being pushed into the barrel 1.

[0069] By utilizing the upper and lower horizontal sections of the I-groove 13 to restrict the bent portion of the spring 39, the negative pressure liquid absorption component 2 can be restricted to different heights. When stuck in the lower layer, the rebound of the second elastic member 38 can be avoided, causing the negative pressure liquid absorption component 2 to slide up and detach from the gun head tube 11. The push rod 310, on the one hand, can press the bent portion of the spring 39 to detach from the I-groove 13, and on the other hand, can slide down to drive the quantitative liquid absorption structure 3 to slide down as a whole, so that it moves to the center and is inserted into the gun head tube 11. The operation is simple and convenient. The limiting structure 4 can also avoid accidentally pressing the slide and causing the quantitative liquid absorption structure 3 to rebound and reset, making it more stable to use.

[0070] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0071] When in use, first find the quantitative liquid aspiration structure 3 corresponding to the required capacity, first press the push rod 310 inward to bend the spring sheet 39 to disengage from the I-shaped groove 13, then slide the push rod 310 downward, and push the slide rod 36 downward through the spring sheet 39. At this time, the connecting rod 35 is used to cooperate with gravity to make the bottom end of the pushed quantitative tube 31 slide into the gun head tube 11 (the conical design at the bottom end of the gun barrel 1 can guide the bottom end of the quantitative tube 31 to slide toward the center), and then the sealing ring 34 is pressed into the gun head tube 11 under the pressure of the slide rod 36 and the connecting rod 35, so that the quantitative tube 31 can be inserted, and the gun head tube 1 1 seal, push to the bottom and release the pressure on the push rod 310, at this time, the spring piece 39 rebounds and inserts into the lower horizontal section of the I-shaped groove 13 and gets stuck, so as to limit the upward springing of the quantitative liquid absorption structure 3, and at the same time, the sliding piece at the outer end of the push rod 310 is stuck outside by the limiting sleeve 41, and at this time, the sliding piece and the push rod 310 cannot be pressed inward; when it is necessary to reset, the limiting sleeve 41 must be lowered first to separate the sliding piece and the push rod 310, and then the sliding piece must be pressed to make the push rod 310 push the spring piece 39 to separate from the I-shaped groove 13, and at this time, the second elastic member 38 can be rebounded to reset the quantitative tube 31;

[0072] At this time, the bottom end of the quantitative tube 31 extends out of the gun head tube 11, and the gun head can be put on to perform the liquid aspiration operation;

[0073] When aspirating liquid, first press the pressing rod 24 downward to push the first piston 23 downward. Since the gun head tube 11 at the bottom end of the gun barrel 1 is blocked by the quantitative tube 31, and the quantitative tube 31 is isolated by the second piston 32, a closed space is formed in the lower layer of the negative pressure liquid aspiration component 2. When the first piston 23 slides downward, the second piston 32 is pressed downward by air pressure. At this time, the gun head is inserted into the liquid again, and the pressing rod 24 is released. The first piston 23 bounces upward under the elastic force of the first elastic member 25, and then the second piston 32 is pulled up by the negative pressure, and then the negative pressure in the quantitative tube 31 is used to absorb the air in the gun head, and then the liquid is sucked into the gun head, and the liquid can be transferred.

[0074] It should be noted that, in this article, relational terms such as first and second, etc. 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 these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fast-switching three-channel quantitative pipette gun, comprising a gun barrel, and a gun head tube is arranged at the center of the bottom end of the gun barrel, characterized in that: Also includes: The negative pressure liquid suction component is fixedly connected to the middle of the gun barrel and is coaxially arranged with the gun barrel, and generates negative pressure by pressing to suck the liquid; Three groups of quantitative liquid suction structures are evenly distributed on the periphery of the negative pressure liquid suction component, and the three groups of quantitative liquid suction structures can absorb different capacities of liquid. By inserting the bottom ends of different quantitative liquid suction structures into the gun head tube and sealing the gun head tube, when negative pressure is generated in the space below the negative pressure liquid suction component, liquid is sucked through the quantitative liquid suction structure located in the gun head tube, and a limiting structure is provided on the gun tube to limit the downward movement of the quantitative liquid suction structure to prevent it from being reset due to accidental touch; Three groups of guide plates are arranged at the bottom of the inner cavity of the gun barrel and are staggered with the three groups of quantitative liquid suction structures to guide the quantitative liquid suction structures to move radially.

2. A fast-switching three-channel quantitative pipette according to claim 1, characterized in that: The negative pressure liquid suction component comprises: A flange, fixedly connected to the middle of the barrel; The negative pressure tube is coaxially fixed to the top of the flange, and the center of the flange is hollowed out inside the negative pressure tube; A first piston is slidably connected to the inside of the negative pressure tube; A pressing rod, fixedly connected to the top of the first piston and used to press the first piston downward; The first elastic member is elastically abutted between the first piston and the flange to rebound and reset the first piston after being pressed downward.

3. A fast-switching three-channel quantitative pipette according to claim 2, characterized in that: The quantitative liquid absorption structure comprises: The quantitative tube is in the shape of a needle tube and the outer diameter of the bottom end is smaller than the inner diameter of the gun head tube. The length of the quantitative tube is greater than the length of the gun head tube, so that the bottom end of the quantitative tube can be extended from the bottom after being inserted into the gun head tube; A second piston is slidably disposed inside the quantitative tube; The positioning ring is arranged on the inner wall of the quantitative tube and is located above the second piston. The positioning rings of the three sets of quantitative liquid suction structures have different heights so that the second piston slides up at different distances to extract liquids of different capacities. The sealing ring is fixedly sleeved on the outer side of the bottom end of the quantitative tube and is used to seal the gun head tube.

4. A fast-switching three-channel quantitative pipette according to claim 3, characterized in that: The top end of the quantitative tube is rotatably connected to a sliding rod through a connecting rod, and the sliding rod slides through a flange. A sealing rubber sleeve mounted on the outside of the sliding rod is penetrated inside the flange. The top end of the sliding rod is thickened, and a second elastic member is mounted outside the sliding rod and between the thickened section and the flange for rebounding and resetting the quantitative tube. A clamping structure is fixed to the top end of the sliding rod to engage with the gun barrel to limit the height of the quantitative tube.

5. A fast-switching three-channel quantitative pipette according to claim 4, characterized in that: The clamping structure includes a spring sheet connected to the top of the sliding rod, the top of the spring sheet 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 sheet, and the front section of the push rod is set as a sliding structure, and the spring sheet is pushed to bend and slide down by pushing the sliding structure.

6. A fast-switching three-channel quantitative pipette according to claim 5, characterized in that: An I-shaped groove is provided on the side of the gun barrel, the horizontal section width of the I-shaped groove is adapted to the width of the shrapnel, and the vertical section width of the I-shaped groove is adapted to the push rod.

7. A fast-switching three-channel quantitative pipette according to claim 6, characterized in that: The limiting structure includes a sliding sleeve arranged on the outside of the barrel and located below the I-slot, the inner wall of the limiting sleeve and the outer wall of the barrel are respectively provided with an upper convex ring and a lower convex ring, and a third elastic member is abutted between the upper convex ring and the lower convex ring, and the limiting sleeve is inserted between the slide and the barrel by the third elastic member bouncing the upper convex ring to limit the slide from being pushed into the barrel.

8. The fast-switching three-channel quantitative pipette according to claim 2, characterized in that: The top end of the gun barrel is threadedly connected with a top cover, the pressing rod slides through the top cover and a pressing cap is arranged on the top end.

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