Organic synthesis pipette

Abstract

The utility model relates to organic synthesis pipette gun, include: needle cylinder, needle cylinder has internal space, piston assembly, piston assembly includes first push rod, second push rod, piston rod, piston head, first push rod with second push rod fixed connection is in instrument, piston rod with second push rod fixed connection is together, piston head fixed mounting is at the end of piston rod, piston rod with piston head all place in the internal space of needle cylinder, at least one part of first push rod, second push rod place in the internal space of needle cylinder, and needle nozzle subassembly, needle nozzle subassembly detachable fixed mounting is on needle cylinder.

Description

Technical Field

[0001] This utility model relates to the field of pipettes, specifically to pipettes for organic synthesis. Background Technology

[0002] Pipettes are frequently used in organic synthesis experiments. They are crucial tools for precisely transferring minute amounts of liquid, especially in experiments involving reagents, high-precision operations, or sensitive reaction conditions. However, current technologies often lack precision in transferring minute amounts of liquid, frequently resulting in the aspiration of excessive amounts. For example, Chinese utility model patent application CN202420470374.9 discloses a user-friendly pipette comprising a pipette body and an anti-drip assembly. A handle is fixedly connected to the left outer wall of the pipette body, and a pipette tip is engaged at the bottom end of the body. The anti-drip assembly is located at the bottom end of the pipette tip, and a curved nozzle is provided at the bottom end of the pipette body. This user-friendly pipette features a mounting hole in the handle for placing the pipette body on a pipette holder. The handle prevents the pipette from falling during handling, thus facilitating operation. The bottom end of the curved nozzle is designed as a curved tube, and the inner wall of the left end of the anti-drip tube is higher than the inner wall of the left end of the curved nozzle. This prevents leakage caused by sample movement during pipetting, avoiding any impact on the test results. Although the pipette provided by this patent solves the problem of sample leakage, it cannot accurately aspirate a preset volume of liquid. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a pipette for organic synthesis.

[0004] To achieve the above objectives, this utility model adopts the following technical solution: a pipette for organic synthesis, comprising:

[0005] A syringe having an internal space;

[0006] A piston assembly includes a first push rod, a second push rod, a piston rod, and a piston head. The first push rod and the second push rod are fixedly connected to the instrument. The piston rod and the second push rod are fixedly connected together. The piston head is fixedly installed at the end of the piston rod. The piston rod and the piston head are entirely placed inside the syringe. At least a portion of the first push rod and the second push rod are placed inside the syringe.

[0007] And a needle tip assembly, which is detachably and fixedly mounted on the syringe.

[0008] In some embodiments of this application, the syringe has a first opening that communicates with the internal space, and an internal thread is provided on the inner wall of the first opening; the piston assembly further includes a first limiting member, the first limiting member having a first through hole that axially extends through the first limiting member, and the first through hole is adapted to the first push rod, so that the first push rod passes through the first through hole, and the first push rod and the first through hole are sealed together, and the first push rod can move in the first through hole; the outer wall of the first limiting member is provided with an external thread that is adapted to the internal thread on the inner wall of the first opening of the syringe, and the first limiting member and the syringe are detachably and fixedly connected by a threaded connection.

[0009] In some embodiments of this application, the piston assembly further includes a second limiting member, which is fixedly sleeved on the second push rod. The second limiting member includes a second limiting member body and a limiting flange. The limiting flange is fixedly connected to the second limiting member body, and the limiting flange protrudes outward from the outer wall of the second limiting member body along the radial direction of the limiting member body by a predetermined distance. The radial length of the limiting flange is greater than the diameter of the first through hole of the first limiting member, so that when the second limiting member moves to a predetermined position with the second push rod, the limiting flange on the second limiting member abuts against the area around the first through hole of the first limiting member, thereby preventing the second push rod from moving further.

[0010] In some embodiments of this application, the needle assembly includes a snap-fit ​​sleeve, an inner sleeve, and an outer sleeve. The inner sleeve has a first receiving chamber, and the outer sleeve has a second receiving chamber. The inner sleeve is placed in the second receiving chamber of the outer sleeve. The piston head is placed in the first receiving chamber of the inner sleeve and is movable within the first receiving chamber. A snap-fit ​​hook is provided at one end of the snap-fit ​​sleeve, and a first snap-fit ​​member and a second snap-fit ​​member are provided on the inner wall of the internal space of the syringe. The snap-fit ​​hook of the snap-fit ​​sleeve engages with the first snap-fit ​​member and the second snap-fit ​​member, thereby fixing the snap-fit ​​sleeve to the syringe. The other end of the snap-fit ​​sleeve is inserted into the gap between the inner sleeve and the outer sleeve, thereby fixing the inner sleeve, the outer sleeve, and the snap-fit ​​sleeve together.

[0011] In some embodiments of this application, the inner sleeve has a needle tip structure with a suction nozzle; the inner sleeve has a liquid storage cavity, which is connected to the suction nozzle, and the liquid storage cavity is part of the first receiving chamber of the inner sleeve, and liquid enters the liquid storage cavity from the suction nozzle.

[0012] In some embodiments of this application, the needle assembly further includes a third limiting member and a second spring. The second spring is fixedly connected to the inner wall of the first receiving chamber of the inner sleeve on one hand, and fixedly connected to the third limiting member on the other hand. When the piston head moves and presses against the third limiting member and pushes it to a preset position, the second spring prevents the third limiting member from moving further, thereby preventing the piston head from moving too far.

[0013] In some embodiments of this application, the piston assembly further includes a first spring, which is sleeved on the piston rod, with one end of the first spring fixedly connected to the piston rod and the other end of the first spring fixedly connected to the piston head.

[0014] The beneficial effects of this application are as follows: The pipette for organic synthesis provided by this application has a simple structure. Given that a first limiting member is provided on the syringe and a second limiting member is provided on the second push rod, when the piston rod drives the piston head to a preset position, the second limiting member abuts against the first limiting member, thereby preventing the piston rod from moving further. When the piston head moves, the liquid is drawn from the nozzle into the storage chamber, thereby completing the liquid aspiration action. Furthermore, since the positions of the first limiting member on the syringe and the second limiting member on the second push rod can be set as needed, the amount of liquid drawn into the storage chamber can be precisely controlled. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the pipette used for organic synthesis provided by this utility model.

[0016] Figure 2 for Figure 1 The image shows an axial cross-sectional view of a pipette used in organic synthesis.

[0017] Figure 3 for Figure 2 The image shows a magnified view of a pipette used in organic synthesis.

[0018] Figure 4 for Figure 2 Another enlarged view of a pipette used in organic synthesis. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0020] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0021] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0022] Please refer to Figure 1-4 This application provides a pipette for organic synthesis (hereinafter referred to as "pipette"), which includes:

[0023] Syringe 1, wherein the syringe 1 has an internal space 100;

[0024] A piston assembly includes a first push rod 3, a second push rod 4, a piston rod 5, and a piston head 7. The first push rod 3 and the second push rod 4 are fixedly connected to the instrument, the piston rod 5 and the second push rod 4 are fixedly connected together, and the piston head 7 is fixedly installed at the end of the piston rod 5. The piston rod 5 and the piston head 5 are all placed in the internal space 100 of the syringe 1, and at least a portion of the first push rod 3 and the second push rod 4 are placed in the internal space 100 of the syringe 1.

[0025] And a needle tip assembly 2, which is detachably fixedly mounted on the syringe 1.

[0026] Please refer to some embodiments of this application. Figure 1-4The syringe 1 has a first opening 101, which communicates with the internal space 100. An internal thread is provided on the inner wall of the first opening 101. The piston assembly further includes a first limiting member 8, which has a first through hole 80. The first through hole 80 axially extends through the first limiting member 8 and is adapted to the first push rod 3, so that the first push rod 3 passes through the first through hole 80. The first push rod 3 and the first through hole 80 are sealed together, and the first push rod 3 can move in the first through hole 80. An external thread is provided on the outer wall of the first limiting member 8, which is adapted to the internal thread on the inner wall of the first opening 101 of the syringe 1. The first limiting member 8 and the syringe 1 are detachably and fixedly connected by a threaded connection.

[0027] In some embodiments of this application, please refer to Figure 1-4 The piston assembly further includes a second limiting member 9, which is fixedly sleeved on the second push rod 4. The second limiting member 9 includes a second limiting member body 90 and a limiting flange 91. The limiting flange 91 is fixedly connected to the second limiting member body 90, and the limiting flange 91 protrudes outward from the outer wall of the second limiting member body 90 radially outward by a predetermined distance. The radial length of the limiting flange 91 is greater than the diameter of the first through hole 80 of the first limiting member 8. This allows the limiting flange 91 on the second limiting member 9 to abut against the area around the first through hole 80 of the first limiting member 8 when the second limiting member 9 moves to a predetermined position along with the second push rod 4, thereby preventing the second push rod 4 from moving further. Since the specific position of the second limiting member 9 fixedly sleeved on the second push rod 4 can be set, the distance the second push rod 4 moves can also be set. That is, the moving distance of the piston head 7 can be set, thereby allowing precise control of the total amount of liquid drawn by the pipette.

[0028] In some embodiments of this application, please refer to Figure 1-4The needle tip assembly 2 includes a snap-fit ​​sleeve 21, an inner sleeve 22, and an outer sleeve 25. The inner sleeve 22 has a first receiving chamber 220, and the outer sleeve 25 has a second receiving chamber 250. The inner sleeve 22 is placed in the second receiving chamber 250 of the outer sleeve 25. The piston head 7 is placed in the first receiving chamber 220 of the inner sleeve 22, and the piston head 7 is movable within the first receiving chamber 220. A hook 211 is provided on one end of the snap-fit ​​sleeve 21. The inner wall of the internal space 100 of the syringe 1 is provided with a first snap-fit ​​member 102 and a second snap-fit ​​member 103. The snap-fit ​​sleeve 21 has a snap-fit ​​hook 211 that engages with the first snap-fit ​​member 102 and the second snap-fit ​​member 102, thereby fixing the snap-fit ​​sleeve 21 to the syringe 1. The other end 212 of the snap-fit ​​sleeve 21 is inserted into the gap between the inner sleeve 21 and the outer sleeve 25, thereby fixing the inner sleeve 21, the outer sleeve 25 and the snap-fit ​​sleeve 21 together.

[0029] In some embodiments of this application, please refer to Figure 1-4 The inner sleeve 22 has a needle tip structure 221, and the needle tip structure 221 has a suction port 2210; the inner sleeve 22 has a liquid storage chamber 222, and the liquid storage chamber 222 is connected to the suction port 2210. The liquid storage chamber 222 is part of the first receiving chamber 220 of the inner sleeve 22, and liquid enters the liquid storage chamber 222 from the suction port 2210.

[0030] In some embodiments of this application, please refer to Figure 1-4 The needle assembly 2 also includes a third limiting member 23 and a second spring 24. The second spring 24 is fixedly connected to the inner wall of the first receiving chamber 220 of the inner sleeve 22 on one hand, and the second spring 24 and the third limiting member 23 are fixedly connected together on the other hand. When the piston head 7 moves to press against the third limiting member 23 and push it to a preset position, the second spring 24 prevents the third limiting member 23 from moving further, thereby preventing the piston head 7 from moving too far.

[0031] In some embodiments of this application, please refer to Figure 1-4 The piston assembly further includes a first spring 5, which is sleeved on the piston rod 5, with one end of the first spring 5 fixedly connected to the piston rod 5 and the other end of the first spring 5 fixedly connected to the piston head 7.

[0032] The pipette for organic synthesis provided in this application has a simple structure. Given that a first limiting member is provided on the syringe and a second limiting member is provided on the second push rod, when the piston rod drives the piston head to a preset position, the second limiting member abuts against the first limiting member, thereby preventing the piston rod from moving further. When the piston head moves, the liquid is drawn from the nozzle into the storage chamber, thus completing the liquid aspiration action. Furthermore, since the positions of the first limiting member on the syringe and the second limiting member on the second push rod can be set as needed, the amount of liquid drawn into the storage chamber can be precisely controlled.

[0033] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pipette for organic synthesis, characterized in that, include: A syringe having an internal space; A piston assembly includes a first push rod, a second push rod, a piston rod, and a piston head. The first push rod and the second push rod are fixedly connected to the instrument. The piston rod and the second push rod are fixedly connected together. The piston head is fixedly installed at the end of the piston rod. The piston rod and the piston head are entirely placed inside the syringe. At least a portion of the first push rod and the second push rod are placed inside the syringe. And a needle tip assembly, which is detachably and fixedly mounted on the syringe.

2. The pipette for organic synthesis according to claim 1, characterized in that, The syringe has a first opening that communicates with the internal space, and an internal thread is provided on the inner wall of the first opening. The piston assembly further includes a first limiting member with a first through hole axially extending through the first limiting member. The first through hole is adapted to the first push rod, thereby allowing the first push rod to pass through the first through hole. The first push rod and the first through hole are sealed together, and the first push rod can move within the first through hole. The outer wall of the first limiting member is provided with an external thread that matches the internal thread on the inner wall of the first opening of the syringe. The first limiting member and the syringe are detachably and fixedly connected by a threaded connection.

3. The pipette for organic synthesis according to claim 2, characterized in that, The piston assembly further includes a second limiting member, which is fixedly sleeved on the second push rod. The second limiting member includes a second limiting member body and a limiting flange. The limiting flange is fixedly connected to the second limiting member body, and the limiting flange protrudes outward from the outer wall of the second limiting member body along the radial direction of the limiting member body by a predetermined distance. The radial length of the limiting flange is greater than the diameter of the first through hole of the first limiting member. This allows the limiting flange on the second limiting member to abut against the area around the first through hole of the first limiting member when the second limiting member moves to a predetermined position with the second push rod, thereby preventing the second push rod from moving further.

4. The pipette for organic synthesis according to claim 1, characterized in that, The needle tip assembly includes a snap-fit ​​sleeve, an inner sleeve, and an outer sleeve. The inner sleeve has a first receiving chamber, and the outer sleeve has a second receiving chamber. The inner sleeve is placed in the second receiving chamber of the outer sleeve. The piston head is placed in the first receiving chamber of the inner sleeve and is movable within the first receiving chamber. A snap-fit ​​hook is provided at one end of the snap-fit ​​sleeve, and a first snap-fit ​​member and a second snap-fit ​​member are provided on the inner wall of the internal space of the syringe. The snap-fit ​​hook of the snap-fit ​​sleeve engages with the first snap-fit ​​member and the second snap-fit ​​member, thereby fixing the snap-fit ​​sleeve to the syringe. The other end of the snap-fit ​​sleeve is inserted into the gap between the inner sleeve and the outer sleeve, thereby fixing the inner sleeve, the outer sleeve, and the snap-fit ​​sleeve together.

5. The pipette for organic synthesis according to claim 4, characterized in that, The inner sleeve has a needle tip structure with a suction nozzle; the inner sleeve has a liquid storage chamber, which is connected to the suction nozzle. The liquid storage chamber is part of the first receiving chamber of the inner sleeve, and liquid enters the liquid storage chamber from the suction nozzle.

6. The pipette for organic synthesis according to claim 4, characterized in that, The needle assembly also includes a third limiting member and a second spring. The second spring is fixedly connected to the inner wall of the first receiving chamber of the inner sleeve on one side, and the second spring and the third limiting member are fixedly connected together on the other side. When the piston head moves and presses against the third limiting member and pushes it to a preset position, the second spring prevents the third limiting member from moving further, thereby preventing the piston head from moving too far.

7. The pipette for organic synthesis according to claim 1, characterized in that, The piston assembly further includes a first spring, which is sleeved on the piston rod, with one end of the first spring fixedly connected to the piston rod and the other end of the first spring fixedly connected to the piston head.

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