Accurate control of the amount of quantitative dropper

Abstract

The utility model discloses a kind of precision control's quantitative dropper, it includes: dropper main body, dripper, extrusion component and protective cap;Cavity is formed in dropper main body inside, volume adjusting sliding slot is provided on outer peripheral cylinder, volume adjusting sliding slot includes several movable clamping slots with different axial heights and along the circumferential distribution of dropper main body outer periphery;Extrusion component is axially movably mounted on dropper main body and changes the volume of cavity by axial movement, forces liquid to enter and exit cavity;Extrusion component has limit portion, limit portion extends into movable clamping slot, movable clamping slot is limited to the axial movement range of limit portion by limit, in turn limit the pressing distance of extrusion component, and limit portion can be moved into different movable clamping slot when rotating extrusion component, realize the adjustment of pressing distance.The utility model can satisfy the requirement of trace liquid precision transfer in medicine, cosmetics and other fields, with wide application prospect and market value.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, and in particular relates to a quantitative dropper for precise volume control. Background Technology

[0002] In fields such as laboratory analysis, medical testing, and fine chemicals, the precise transfer of trace amounts of liquid is crucial for ensuring the accuracy of experimental results. Traditional droppers generally employ a fixed-volume design, failing to flexibly adjust the liquid volume according to different experimental needs. This necessitates frequent replacement of droppers with different sizes, impacting work efficiency and increasing the risk of cross-contamination. Furthermore, existing droppers have significant shortcomings when handling ultrasonic treatment: ordinary plastic materials are prone to deformation under ultrasonic waves, leading to seal failure; while glass is ultrasonic-resistant, it is fragile and expensive. More importantly, when transferring corrosive or biohazardous liquids, traditional droppers lack effective overflow prevention designs, and leakage of trace amounts of liquid may pose safety hazards to operators. Although some adjustable-volume dropper products exist on the market, their adjustment mechanisms often suffer from inaccurate positioning and loosening, failing to meet the requirements of high-precision experiments. Therefore, there is an urgent need to develop a new type of quantitative dropper that combines precise dosage adjustment, ultrasonic compatibility, and safety protection. Utility Model Content

[0003] This invention addresses the shortcomings of existing dropper dosage adjustment mechanisms, such as inaccurate positioning and easy loosening. Therefore, the invention adopts the following technical solution: This utility model provides a precise volume control dropper, which includes: The dropper body has an internal cavity for containing liquid. The outer cylindrical body of the dropper body is provided with a volume adjustment groove. The volume adjustment groove includes a number of movable slots with different axial heights and distributed along the circumferential direction of the outer periphery of the dropper body. A dropper head is installed at one end of the dropper body and forms a liquid outlet communicating with the cavity; A protective cap is detachably fitted around the outer periphery of the dropper and used to seal the liquid outlet; A squeezing assembly is axially movably mounted at the other end of the dropper body and forces liquid into and out of the cavity by changing the volume of the cavity through axial movement. The squeezing assembly has a limiting part that extends into the movable slot. The movable slot limits the pressing distance of the squeezing assembly by limiting the axial movement range of the limiting part. When the squeezing assembly is rotated, the limiting part can move to different movable slots to adjust the pressing distance.

[0004] Furthermore, two sets of volume adjustment grooves are provided and symmetrically arranged on the outer periphery of the dropper body, and two sets of limiting parts are provided accordingly.

[0005] Furthermore, the movable slot includes a first slot and a second slot distributed circumferentially along the outer periphery of the dropper body. The first slot and the second slot have different axial dimensions and are circumferentially connected by a connecting groove.

[0006] Furthermore, the movable slot includes a first slot, a second slot, and a third slot distributed circumferentially along the outer periphery of the dropper body. The first slot, the second slot, and the third slot each have different axial dimensions. The first slot and the second slot are circumferentially connected through a first connecting groove, and the second slot and the third slot are axially connected through a second connecting groove.

[0007] Furthermore, the extrusion assembly includes a pressing part and a sealing part; the end of the dropper body near the extrusion assembly is provided with an installation groove, and an isolation part is provided between the installation groove and the cavity; the end of the installation groove away from the cavity is an open structure, the pressing part is provided with a guide ring that cooperates with the inner wall of the installation groove to guide the movement, and the limiting part is provided on the guide ring; the pressing part is exposed outside the dropper body, and the sealing part is sealed and assembled inside the cavity.

[0008] Furthermore, a sealing cylinder is provided at one end of the cavity near the extrusion assembly, and a sealing slide is formed inside the sealing cylinder. The sealing part moves up and down inside the sealing cylinder and seals with the inner wall of the sealing slide through plastic deformation.

[0009] Furthermore, a reset member is provided in the mounting groove to force the pressing part to reset, one end of the reset member abutting the isolation part and the other end abutting the pressing part.

[0010] Furthermore, the dropper includes an assembly part and a nozzle part; the assembly part is detachably assembled on the dropper body and has a sealing protrusion ring inside that seals against the inner wall of the cavity; one end of the nozzle part is adjacent to the assembly part and the other end forms the liquid outlet; the assembly part is provided with an overflow protrusion ring surrounding the nozzle part, and the overflow protrusion ring and the outer periphery of the nozzle part together form a waste liquid collection tank for collecting liquid overflowing from the liquid outlet.

[0011] Furthermore, the outer periphery of the dropper body is provided with an ultrasonic treatment area for the ultrasonic vibrating head to contact.

[0012] Furthermore, the ultrasonic treatment area is made of the same material as other areas of the dropper body, and the material thickness of the ultrasonic treatment area is greater than that of the other areas.

[0013] Furthermore, the ultrasonic treatment area is made of a different material than other areas of the dropper body, and the ultrasonic treatment area is made of an ultrasonically treatable material; the ultrasonically treatable material is PP, PET, PC, COP or COC.

[0014] Compared with existing technologies, the advantages of this utility model's precise volume control dropper are as follows: through mechanical structure innovation and material optimization, it solves the technical problems of traditional droppers in terms of precise volume control, ultrasonic compatibility, and safety protection. It is particularly suitable for high-precision experimental scenarios such as molecular diagnostics and nanomaterial synthesis, meeting the needs of precise transfer of micro-liquids in fields such as pharmaceuticals and cosmetics, and has broad application prospects and market value. Specifically: (1) Innovative precision dose adjustment: The rotary volume adjustment mechanism (using the movable slot and the limiting part) is adopted to achieve precise adjustment of multiple levels from 5μL to 50μL, with an adjustment accuracy of ±1μL; the double symmetrical slide design improves the positioning stability by 300% compared with the traditional single-sided limiting method, effectively preventing adjustment deviation; the modular slot structure supports customized dose settings and can be expanded to various different capacity specifications. (2) Ultrasonic compatibility optimization: By locally thickening or using ultrasonic-resistant materials (such as PP, PET, COP, etc.) to design the ultrasonic treatment area, it is ensured that the dropper can withstand the transmission of ultrasonic energy, while avoiding the cost increase brought about by the overall material upgrade, thus balancing economy and functionality. (3) Overflow prevention safety design: The drip nozzle is equipped with an overflow protrusion ring and a waste liquid collection tank to effectively intercept and collect accidental overflowing droplets, prevent harmful liquids from slipping onto the operator's hands, and significantly improve the safety of use; (4) Enhanced sealing and durability: The design of the sealing cylinder and the plastic deformation sealing part ensures the long-term sealing of the cavity under ultrasonic vibration and frequent extrusion; the guide ring and reset part optimize the pressing stability and reduce operator fatigue; (5) Modular and maintainable: The dripper and the protective cap are connected by threads, which makes it easy to disassemble, clean or replace, and adapt to different liquid treatment needs. At the same time, the protective cap has a built-in sealing plug to prevent liquid leakage during transportation or storage. (6) Ergonomic optimization: The anti-slip texture structure improves the stability of operation and grip, reduces the risk of slipping, and is especially suitable for experimental scenarios where gloves are worn. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is a partially enlarged structural diagram of the volume adjustment groove in an embodiment of this utility model; Figure 3 This is a cross-sectional view of the present invention after the protective cap has been removed. Figure 4 This is a partially enlarged structural diagram of the assembly point between the extrusion component and the dropper body in an embodiment of this utility model; The numbers in the image represent: 100-Precision volume control dropper; 1-Drip tube body, 11-Cavity, 12-Mounting groove, 13-Isolation section, 14-Sealing cylinder, 141-Sealing slide, 15-Ultrasonic treatment area, 16-Anti-slip textured structure, 17-Volume adjustment slide, 171-Modible slot, 1711-First slot, 1712-Second slot, 1712-Connecting slide; 2-Extrusion assembly, 21-Pressing part, 22-Sealing part, 23-Pressing part, 24-Guide ring, 25-Limiting part; 3-Drip head, 31-Assembly part, 311-Sealing convex ring, 32-Drip nozzle part, 321-Liquid outlet, 33-Overflow convex ring; 4-Reset component; 5-Protective cap. Detailed Implementation

[0016] Example 1: Please refer to Figures 1-4 This embodiment is a precise quantitative dropper 100, which includes a dropper body 1, a squeezing component 2 that is movably installed at the bottom of the dropper body 1, a dropper head 3 installed at the top of the dropper body 1, a reset component 4 that pushes the squeezing component 2 downward to reset it, and a protective cap 5 that surrounds the dropper head 3.

[0017] To achieve the quantitative adjustable function of the dropper pressing volume, this embodiment provides a volume adjustment groove 17 on the outer periphery of the dropper body 1. The volume adjustment groove 17 includes several movable slots 171 with different axial heights and distributed circumferentially along the outer periphery of the dropper body 1. The squeezing assembly 2 is provided with a limiting part 25, which extends into the movable slot 171. The movable slot 171 limits the vertical movement range of the limiting part 25, thereby limiting the vertical pressing distance of the squeezing assembly 2. When the squeezing assembly 2 is rotated, the limiting part 25 can move into different movable slots 171 to achieve different pressing distances, thereby achieving the adjustment of the dropper pressing volume (i.e., the pressing dose).

[0018] In this embodiment, two sets of volume adjusting grooves 17 are provided and symmetrically arranged on the outer periphery of the dropper body 1. Two sets of limiting parts 25 are also provided, extending into the two sets of volume adjusting grooves 17 respectively. Compared with unilateral limiting, the symmetrical design of the volume adjusting grooves 17 and the limiting parts 25 can improve the reliability and accuracy of the limiting of the limiting parts 25 by the volume adjusting grooves 17.

[0019] In this embodiment, the movable slot 171 includes a first slot 1711 and a second slot 1712 distributed circumferentially along the outer periphery of the dropper body 1. The first slot 1711 and the second slot 1712 have different axial dimensions and are circumferentially connected by a connecting groove 1713. In this embodiment, the axial length of the first slot 1711 is greater than the axial length of the second slot 1712. When the limiting part 25 rotates into the first slot 1711, the range of motion of the limiting part 25 is the axial length of the first slot 1711. When the limiting part 25 rotates into the second slot 1712, the range of motion of the limiting part 25 is the axial length of the second slot 1712. Therefore, when the limiting part 25 is located in different slots, it has different ranges of motion. As a result, the squeezing component 2 will have different axial displacements relative to the dropper body 1, which will lead to different changes in the volume of the internal cavity of the dropper body 1, thereby generating different pressures and achieving different dosage adjustments. In this embodiment, the first slot 1711 corresponds to a 50 μL draw dose, and the second slot 1712 corresponds to a 5 μL draw dose. In other embodiments, different draw doses can be flexibly designed by setting different axial dimensions of the movable slot 171.

[0020] In other embodiments, the number of movable slots 171 can be flexibly designed according to actual needs, such as three, four or more. The movable slots 171 include a first slot, a second slot, and a third slot, each with different axial dimensions. The first slot and the second slot are circumferentially connected via a first connecting groove, and the second slot and the third slot are axially connected via a second connecting groove.

[0021] The dropper body 1 has a cavity 11 for holding liquid and a mounting groove 12 for mounting the reset component 4 inside. The mounting groove 12 is located at the bottom of the cavity 11. An isolation part 13 is provided between the cavity 11 and the mounting groove 12 to isolate the cavity 11 and the mounting groove 12 while maintaining the sealing of the cavity 11.

[0022] A sealing cylinder 14 is provided on the bottom wall of the cavity 11, extending from the bottom wall of the cavity 11 toward the interior of the cavity 11. A sealing slide 141 is formed inside the sealing cylinder 14. The extrusion assembly 2 has a sealing part 22, which moves up and down within the sealing cylinder 14 and achieves a seal by plastic deformation and engaging with the inner wall of the sealing slide 141. The extrusion assembly 2 changes the pressure inside the cavity 11 by moving the sealing part 22 up and down within the sealing cylinder 14. When the sealing part 22 extrudes into the cavity 11, the pressure inside the cavity 11 increases, releasing the liquid inside the cavity 11. When the sealing part 22 is pulled away from the cavity 11, the pressure inside the cavity 11 decreases, and under the action of the pressure difference, external liquid enters the cavity 11, absorbing the liquid.

[0023] For liquids drawn by a dropper, ultrasonic treatment is required under certain special testing conditions to achieve liquid dispersion and homogenization, accelerated dissolution and reaction, degassing and defoaming, or cell disruption and extraction. However, conventional droppers cannot withstand the transmission of ultrasonic energy and are prone to deformation or even damage. To solve this technical problem, this embodiment provides an ultrasonic treatment area 15 on the outer peripheral surface of the dropper body 1. When ultrasonic treatment is required on the liquid inside the cavity 11, the ultrasonic vibrating head of the ultrasonic device can directly contact the ultrasonic treatment area 15. Compared to making the entire dropper body 1 a material that can be ultrasonically treated, this method effectively reduces product manufacturing costs and improves economic efficiency while meeting the requirements for ultrasonic treatment.

[0024] In this embodiment, the ultrasonic treatment area 15 is a thickened material area, which is made of the same material as other areas of the dropper body 1. The material thickness of the ultrasonic treatment area 15 is greater than that of other areas of the dropper body 1. The dropper body 1 can be injection molded from conventional plastic materials (such as PP, PET, PC, COP or COC, etc.), with the material thickened only in the ultrasonic treatment area 15 to withstand the transmission of ultrasonic energy.

[0025] In other embodiments, the ultrasonic treatment area 15 is made of an ultrasonically treatable material, and it is made of a different material from other areas of the dropper body 1. This can be achieved by a two-stage injection molding process, or by sequentially injection molding other areas of the dropper body 1 while leaving the ultrasonic treatment area 15 empty. An ultrasonically treatable material such as PP, PET, PC, COP, or COC is used to injection mold an ultrasonic treatment area filling block. Then, the ultrasonic treatment area filling block and the main structure of the dropper body 1 are molded into an integral structure by hot melt molding.

[0026] The compression assembly 2 also includes a pressing part 21 and a rod-shaped part 23 connecting the pressing part 21 and the sealing part 22. The pressing part 21 is located outside the dropper body 1, and the pressing part 23 extends through the mounting groove 12 into the sealing cylinder 14. The reset member 4 is installed in the mounting groove 12, with one end abutting against the pressing part 21 and the other end abutting against the isolation part 13. When the pressing part 21 is compressed, the reset member 4 is also compressed, and the reset member 4 is compressed and stores energy. When the pressing part 21 is released, the elastic capacity stored in the reset member 4 is released, pushing the pressing part 21 outward to achieve reset.

[0027] The bottom of the mounting groove 12 is an open structure, and the pressing part 21 is provided with a guide ring 24 that cooperates with the inner wall of the mounting groove 12 to guide the pressing part 21 to move up and down.

[0028] The dropper head 3 is a one-piece molded structure and includes an assembly part 31 and a nozzle part 32 located on top of the assembly part 31. The assembly part 31 is detachably installed on the top of the dropper body 1 and has a sealing ring 311 inside that cooperates with the inner wall of the cavity 11 to achieve a seal; one end of the nozzle part 32 is adjacent to the assembly part 31 and the other end forms a liquid outlet 321, which communicates with the cavity 11.

[0029] Since dropper operation is generally manual, during the process of transferring a sample from container A to container B, 1-2 droplets may overflow from the outlet 321 due to pressure fluctuations inside the cavity 11 or the weight of the sample liquid, and hang on the outer wall of the nozzle 32. During sample transfer, in order to prevent the sample liquid from dripping from the outlet 321, the operator usually holds the dropper with the outlet 321 facing upwards. If the transferred liquid is harmful to the human body, such as being corrosive or possibly carrying viruses or bacteria, there is a risk that droplets will slide down the outer wall of the nozzle 32 and onto the operator's hand. To solve this technical problem, this embodiment provides an overflow protrusion 33 surrounding the nozzle 32 on the upper surface of the assembly part 31. The overflow protrusion 33 and the outer peripheral surface of the nozzle 32 together form an annular waste liquid collection groove 331, which is used to collect the droplets overflowing from the outlet 321, prevent liquid from hanging, and effectively block the droplets from flowing down the outer wall of the dropper body 1 onto the operator's hand.

[0030] The dropper body 1 has a first threaded structure (not shown in the figure) on the outer periphery of its bottom, and the inner wall surface of the assembly part 31 has a first internal threaded structure (not shown in the figure) that mates with the first threaded structure. The dropper body 1 can be detachably installed through the threaded connection.

[0031] The protective cap 5 has an assembly groove (not shown in the figure) that conforms to the outer periphery of the nozzle 32. The bottom of the assembly groove is provided with a sealing plug (not shown in the figure) that is inserted into the liquid outlet 321 of the nozzle 32.

[0032] The overflow ring 33 has a second threaded structure (not shown in the figure) on its outer periphery, and the protective cap 5 has a second internal threaded structure (not shown in the figure) that mates with the second threaded structure. The protective cap 5 achieves a detachable connection with the dripper 3 through the threaded engagement. In other embodiments, the protective cap 5 may also utilize the plastic deformation of the plastic part to achieve a specific interference fit with the dripper 3.

[0033] To improve the operability of the operator and prevent slippage during the pressing and squeezing of the component 2, the outer peripheral surface of the dropper body 1 is also provided with an anti-slip textured structure 16.

[0034] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A precise volumetric dropper, characterized in that, It includes: The dropper body has an internal cavity for containing liquid. The outer cylindrical body of the dropper body is provided with a volume adjustment groove. The volume adjustment groove includes a number of movable slots with different axial heights and distributed along the circumferential direction of the outer periphery of the dropper body. A dropper head is installed at one end of the dropper body and forms a liquid outlet communicating with the cavity; A protective cap is detachably fitted around the outer periphery of the dropper and used to seal the liquid outlet; A squeezing assembly is axially movably mounted at the other end of the dropper body and forces liquid into and out of the cavity by changing the volume of the cavity through axial movement. The squeezing assembly has a limiting part that extends into the movable slot. The movable slot limits the pressing distance of the squeezing assembly by limiting the axial movement range of the limiting part. When the squeezing assembly is rotated, the limiting part can move to different movable slots to adjust the pressing distance.

2. The precise volume control dropper as described in claim 1, characterized in that: Two sets of volume adjustment grooves are provided and symmetrically arranged on the outer circumferential cylinder of the dropper body, and two sets of limiting parts are provided accordingly.

3. The precise volume control dropper as described in claim 2, characterized in that: The movable slot includes a first slot and a second slot distributed circumferentially along the outer periphery of the dropper body. The first slot and the second slot have different axial dimensions and are circumferentially connected by a connecting groove.

4. The precise volume control dropper as described in claim 2, characterized in that: The movable slot includes a first slot, a second slot, and a third slot distributed circumferentially along the outer periphery of the dropper body. The first slot, the second slot, and the third slot each have different axial dimensions. The first slot and the second slot are circumferentially connected through a first connecting groove, and the second slot and the third slot are axially connected through a second connecting groove.

5. The precise volume control dropper as described in claim 1, characterized in that: The extrusion assembly includes a pressing part and a sealing part; the dropper body has an installation groove at one end near the extrusion assembly, and an isolation part is provided between the installation groove and the cavity; the end of the installation groove away from the cavity is an open structure, the pressing part is provided with a guide ring that cooperates with the inner wall of the installation groove to guide the movement, and the limiting part is provided on the guide ring; the pressing part is exposed outside the dropper body, and the sealing part is sealed and assembled inside the cavity.

6. The precise volume control dropper as described in claim 5, characterized in that: A sealing cylinder is provided at one end of the cavity near the extrusion assembly. A sealing slide is formed inside the sealing cylinder. The sealing part moves up and down inside the sealing cylinder and seals with the inner wall of the sealing slide through plastic deformation.

7. The precise volume control dropper as described in claim 5, characterized in that: The mounting groove is provided with a reset member that forces the pressing part to reset. One end of the reset member abuts against the isolation part and the other end abuts against the pressing part.

8. The precise volume control dropper as described in claim 1, characterized in that: The dropper includes an assembly part and a nozzle part; the assembly part is detachably assembled on the dropper body and has a sealing ring inside that seals against the inner wall of the cavity; one end of the nozzle part is adjacent to the assembly part and the other end forms the liquid outlet; the assembly part is provided with an overflow ring surrounding the nozzle part, and the overflow ring and the outer periphery of the nozzle part together form a waste liquid collection tank for collecting the liquid overflowing from the liquid outlet.

9. The precise volume control dropper as described in claim 1, characterized in that: The outer periphery of the dropper body is provided with an ultrasonic treatment area for the ultrasonic vibrating head to contact.

10. The precise volume control dropper as described in claim 9, characterized in that: The ultrasonic treatment area is made of the same material as other areas of the dropper body, and the material thickness of the ultrasonic treatment area is greater than that of the other areas.

11. The precise volume control dropper as described in claim 9, characterized in that: The ultrasonic treatment area is made of a different material than other areas of the dropper body, and the ultrasonic treatment area is made of an ultrasonically treatable material; the ultrasonically treatable material is PP, PET, PC, COP or COC.

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